Steel Billet · Grade
Q235B Steel Billet Supplier
Q235B is a grade in China’s current GB/T 700-2006 carbon structural steel standard. A Q235B billet enquiry must still state how that finished/structural-steel grade basis is to be applied to the semi-finished billet, including chemistry agreement, billet dimensions, downstream product and inspection documents; do not assume universal billet tolerances or equivalence.
Q235B names a structural steel grade. A billet is a semi-finished product. The grade tells you which steel, and the order has to tell everyone the rest — how big, how long, to what tolerance, with what evidence and for what finished article.
Standards, dimensions and evidenceWhat the grade gives you — and what it does not
- GB/T 700-2006, with the edition statedThe grade authority. Naming the edition is what lets a certificate be assessed against a defined text.
- Billet geometry, agreed separatelySection, cut length and tolerance basis. A structural steel standard does not hand you these.
- The downstream productWhat the billet must roll into, and the standard that will qualify the finished item.
- Heat analysis and MTC fieldsWhich elements the certificate must report, agreed before dispatch rather than assumed.
- Any equivalence being proposedIf another designation is being compared, it is a written engineering case — not a translation.
No chemical composition, mechanical property or dimensional tolerance value appears on this page. Those belong to the controlled standard text and to the agreements written into your own order.
Selection logic
When a Q235B billet order is sound — and when it is a wish
Q235B is a well-known grade, which is exactly why it gets ordered on reputation. A sound order and a hopeful one look the same on the enquiry sheet. What separates them is whether the billet-form requirements were ever written down.
Fits when
- The order names GB/T 700-2006 in full, edition included, so the grade sits inside a document the certificate can be checked against.
- Billet geometry — section, cut length and tolerance basis — is written out as its own agreement rather than inferred from the grade.
- The downstream product is named, so the grade choice can be tested against something real rather than against a preference.
- Heat-analysis content, the marking that ties a bundle to its heat, and the document set are agreed before dispatch.
Does not fit when
- The enquiry carries “Q235B billet” and assumes the standard supplies the billet dimensions, tolerances and surface rules by itself.
- The grade is being treated as interchangeable with S235JR, 3SP or another national designation without a written comparison.
- The edition is left as “GB/T 700”, so nobody can say which text the certificate will be held to.
- The intended downstream product is unstated, leaving the grade choice with nothing to answer to.
Closest registered alternatives
Carbon steel billet
Compare when the material family is still open and no grade designation has been fixed.
Boundary: The family narrows the field but specifies no chemistry — the grade decision still has to be made.
carbon steel billet supplierContinuous casting billet
Compare when the production form is the open question and the grade is already settled.
Boundary: The casting route describes how the form was produced; it sets no chemistry or acceptance limit.
continuous casting billet supplierRebar-grade billet
Compare when the billet is destined for reinforcement and the finished-bar standard governs.
Boundary: A rebar-grade billet is not itself a rebar grade — the bar is qualified under its own standard.
rebar billet supplierDecision tool
Q235B Order-Basis Checker
Seven questions that separate the part of your order the grade settles from the part it does not. Run it before the enquiry goes out — it is easier to add a tolerance clause now than to argue about one at intake.
2. Order-basis result
Nothing to check yet — six answers are still open
- GB/T 700-2006 reference and edition
- Q235B designation as written on the order
- Billet section, length and tolerance basis
- Downstream product
- Heat-analysis / MTC fields
- Tolerance and surface agreement basis
The tolerance question is the one most likely to change your answer, so it is worth taking seriously rather than clicking through.
Standards, grades & dimensions
What GB/T 700-2006 settles, and what your order has to
There is a clean line running through this page. The standard settles the steel. The order settles the billet. Everything below is sorted onto one side or the other, so you can see which part of the enquiry is still yours to write.
The standard — what the record establishes
Q235B only means something inside its own document. This is what the official record establishes about that document, where the source stops, and what has to come from your order instead.
| Item | What is established | Source & method | Condition |
|---|---|---|---|
| Standard reference | GB/T 700-2006 — carbon structural steel | Standardization Administration of China, record consulted 2026-10-03 | State the edition on the order; the grade is read against a specific text |
| Status | Listed as current in the official record | Standardization Administration of China, record consulted 2026-10-03 | A revision plan is shown in progress — verify the contract edition at order time |
| What the grade defines | A structural steel grade and its requirements | Standard scope, as recorded | Grade-level requirements; not a billet-form specification |
| Billet form | Not established by the grade — agreed on your order | — | Section, length, tolerance and surface acceptance are order-specific |
| Chemistry values | Not stated here — read from the controlled standard text | — | Request the applicable limits with your enquiry rather than assuming them |
| Mechanical properties | Properties of the finished product, not the billet | — | Established downstream under the finished product's own standard |
Evidence warning. Status and scope statements above come from the official standard record. No chemical composition, mechanical property or dimensional tolerance value is published on this page, because those belong to the controlled standard text and to the conditions you write into your own order.
A note on the revision plan. The record shows GB/T 700-2006 as current alongside a revision in progress. That is routine for a standard of this age, and it is not a reason to avoid the grade. It is a reason to put the edition on your order in full, so that whichever text governs at contracting, the certificate is held to a named version rather than to whatever is current on the day it is issued.
Where Q235B sits among the grades buyers compare it to
Q235B is frequently discussed alongside S235JR, 3SP and 5SP, usually because the numbers and letters look related. The last column is the one that matters — it says what would actually have to be produced before one of these could stand in for another.
| Designation | Governing family | Relationship to Q235B | What a substitution requires |
|---|---|---|---|
| Q235B | GB/T 700-2006 | This designation | Cite the full designation with its class letter and the contract edition |
| Other Q235 classes | GB/T 700-2006 | Different class, same standard | Confirm the intended class — the classes carry different impact bases |
| S235JR | European structural standard | Cross-standard comparison only | Written comparison against both governing documents, filed with the order |
| 3SP / 5SP | GOST 380-2005 | Cross-standard comparison only | Written comparison against both governing documents, filed with the order |
| ASTM grades | Varies with the specific designation | Cross-standard comparison only | Exact designation and edition, compared against both texts |
| Special agreed chemistry | Order-specific | Supersedes the grade for that order | Limits written into the order and not reused without re-agreement |
Every cross-standard row asks for the same thing: a written comparison against both documents with the conclusion on file. No row asks for a judgement that the designations mean the same thing, because none of them does.
Billet geometry — the part the grade does not supply
Nominal cross-sectional area and the unit mass that follows from it. Area is the exact nominal square (side²); mass is calculated from that area at a steel density of 7,850 kg/m³. Both are planning figures — a labelled engineering assumption, not an acceptance value. The range is commonly requested sections, not a stock list.
| Nominal side (mm) | Nominal area | Indicative unit mass | Method & basis | Typical downstream use |
|---|---|---|---|---|
| 100 × 100 | 10,000 mm² | ≈ 78.5 kg/m | side² at 7,850 kg/m³ | Wire-rod and small-section feedstock |
| 125 × 125 | 15,625 mm² | ≈ 122.7 kg/m | side² at 7,850 kg/m³ | Bar and light-section rolling |
| 150 × 150 | 22,500 mm² | ≈ 176.6 kg/m | side² at 7,850 kg/m³ | Bar, rebar and section rolling |
| 160 × 160 | 25,600 mm² | ≈ 201.0 kg/m | side² at 7,850 kg/m³ | Heavy bar and section production |
Dimensional tolerance, straightness, corner condition and cut-length variation sit outside this table on purpose. They are order-specific agreements, confirmed against the receiving mill, and stating them here as general values would misrepresent what an order actually carries.
Mechanical properties — why a billet has none to certify
A billet has not been rolled. It carries no tensile, yield or elongation value, because those are properties of a finished, tested product. What the grade fixes at billet stage is a composition route — the input that makes the downstream values reachable, not the proof that they will be reached.
Properties belong downstream
Yield, tensile and elongation are established on the rolled product under its own standard. Printing them against a billet would describe something that does not exist yet.
Composition is the input
The grade fixes a composition route. That is the lever you hold at billet stage, which is why the heat analysis carries more weight here than a property table would.
The route decides the result
Reduction and cooling practice turn the same composition into different properties. Whether your mill reaches the required values is its process capability to confirm, not the certificate's.
Related specification paths
GB/T 700 steel billet
The standard this grade belongs to, as it applies to billet. It defines the steel and its scope — it does not remove the need to agree billet geometry on your order.
gb t 700 steel billet150 × 150 mm steel billet
A section route, not a grade route. Settling the section does nothing to settle which grade your product needs — they are separate decisions.
150x150 steel billetQuality, testing & documentation
The verification matrix
A grade printed on a certificate is a claim about steel. Working down this table is how you turn it into an acceptance you can defend — what you specify, what evidence to request, who signs it off, and what it costs when a line is missed.
| Requirement | Buyer must specify | Evidence to request | Acceptance owner | Risk if missing |
|---|---|---|---|---|
| Standard edition | The contract edition, stated in full rather than as a series number | Stated in the order documents as the governing basis | Buyer's technical authority | The certificate has no defined text to be measured against |
| Grade identity | The designation including its class letter, exactly as the standard prints it | Heat analysis issued against the named edition | Buyer's technical authority | A class-less designation leaves the impact basis undefined |
| Billet geometry | Section, cut length and the dimensional tolerance basis | Dimensional record against the order, with its tolerance basis stated | Receiving mill | Material that cannot be judged conforming because no criterion was set |
| Surface and end condition | Quantified defect limits and the inspection basis | Visual and dimensional inspection record | Receiving mill | Defects carry into the rolled product rather than being reduced out |
| Heat traceability | How heat identity is marked and what the marking must survive | Heat number on the bundle, tied to the certificate; marking method stated | Buyer / mill quality function | A delivered lot cannot be connected back to its analysis |
| Grade separation | Whether more than one grade moves through the same program | The mill's written handling arrangement for each grade | Receiving mill | Mixed handling produces output that cannot be certified either way |
| Equivalence, if any | Whether another designation is to be accepted in place of this one | Written engineering comparison against both governing documents | Buyer's technical authority | An unrecorded substitution is an unverified material |
| Shipment documents | Document set, language and issue timing | Certificate, packing list and documents per the Incoterm | Buyer's commercial function | Release, clearance or payment is delayed at destination |
Certification limit. Nothing here should be read as an assertion that a certificate, approval or test report is already held or issued, or that any given composition will reach a particular rolled-product outcome. Content, issuing party and timing are settled against your order. No certificate is created here and none is implied.
Application & industry paths
Which rolling program tests a Q235B choice
Q235B is a structural grade, so its natural downstream routes are long products. Pick the one closest to yours and see what the route asks of the grade, what that implies for your order, and where the reasoning runs out.
Bar and section rolling
- Operating requirement
- Section and grade matched to the mill's pass schedule and the bar's own standard
- Selection implication
- This is where grade choice shows up most directly in the finished product, because bar properties are tested against the bar standard.
- Where the reasoning stops
- Bar tolerances and properties come from the bar standard — the billet supply does not carry them.
Rebar rolling
- Operating requirement
- Composition anchored to the reinforcing standard the finished bar must satisfy
- Selection implication
- Reinforcement acceptance runs on the finished bar's own tests, so the grade has to be chosen against that standard rather than against familiarity.
- Where the reasoning stops
- A Q235B billet is not a rebar grade — the finished bar is qualified under its own standard.
Wire-rod rolling
- Operating requirement
- Composition and surface condition suited to drawing
- Selection implication
- Surface acceptance carries more weight here than in re-rolling — defects survive drawing rather than being worked out.
- Where the reasoning stops
- Drawing behaviour depends on the whole route, not on the billet alone.
GCC markets
Shipping Q235B billet into the Gulf
Customs, documentation and logistics are handled country by country on the routes below. To price a shipment we need a named port or place, an Incoterm, and the importer's document and classification position. None of that is an availability claim — it is what a quotation has to be built on.
United Arab EmiratesDomestic mill feedstock with Dubai-based coordination.
Name the receiving mill and the edition your contract is placed against. Domestic delivery is coordinated from Dubai against the agreed section, cut length and heat separation.
steel billet supplier UAE
Saudi ArabiaMill feedstock with technical submittal approval.
Saudi routes usually need technical submittal approval before release. Settle the standard edition, the grade, the certificate scope and the named port or inland destination before anything is quoted.
steel billet supplier Saudi Arabia
QatarTechnical approval and document scope led.
Confirm the importer's document and classification position, the named port, and how long the approval sequence runs before the quotation is finalised.
steel billet supplier Qatar
OmanPort-oriented supply for downstream rolling.
Name the port or inland delivery place and the Incoterm rule. The grade and billet section are harmonised with what the receiving mill's program actually runs.
steel billet supplier Oman
KuwaitMill feedstock with production hand-off planning.
Tie the grade choice to the rolled product, and agree the shipment against the named destination and the delivery window the mill is working to.
steel billet supplier Kuwait
BahrainIndustrial supply and re-export documentation.
Industrial routes live or die on accurate paperwork. Confirm the document set, the named place and the importer's requirements before dispatch, not after arrival.
steel billet supplier BahrainBefore an offer: name the destination or port, the Incoterm 2020 rule, and the importer's documentation and classification requirements. Confirm the tariff classification for the billet form with your own customs adviser — that determination is not made on this page.
Commercial & logistics inputs
What we need before we can price this
A Q235B quotation is assembled from the inputs below. Price, stock, lead time, origin and delivery dates are not published here — they are confirmed against your enquiry, and no figure is invented to fill a gap.
Edition and grade first
Name the contract edition and the full designation before anything else. Every other line in the enquiry is written against that basis.
Quantity & unit
State the quantity with its unit — pieces or MT — and whether it is one lot or a schedule across several heats.
Mass basis
Agree whether theoretical mass from nominal dimensions or actual weighbridge mass governs settlement, and the tolerance between them.
Named place / port
A named port or inland delivery place is required. A country on its own does not define the delivery obligation.
Incoterm 2020
Name the rule (EXW, FOB, CFR, CIF, DAP…). It decides who carries risk, freight and insurance at each point.
Payment & documents
State the documentary and payment requirement, and the document set the importer has to receive.
Packing, tagging & separation
Strapping, heat tagging, lifting points and how multiple heats are kept apart through handling and shipment.
Inspection scope
Which inspections apply, at whose cost, and whether witnessing is required.
Open items
Anything not yet decided is carried as an open item in the enquiry, never assumed on your behalf.
Quote required. Price, availability, lead time and origin are confirmed against your enquiry. A figure published without a live basis would misstate what an order actually carries, so none is given.
Alternatives & technical resources
Where to go next
Depends what is still open. If the grade itself is the question, start with the sibling grades. If you know the grade and not the geometry, take a specification path. If you are still assembling the enquiry, the reference material will save you a round of correspondence.
Product hierarchy
- steel billet supplier
The full billet scope — grades, sizes, standards and the wider type range.
- steel billet grades
The sibling grade routes. Designations are not interchangeable between them.
Related specification paths
- carbon steel billet supplier
The material family this grade belongs to — useful when the family is still open.
- continuous casting billet supplier
Compare the production form when the route is the open question.
- rebar billet supplier
Compare when the billet is destined for reinforcement rather than general long product.
Technical resources
- steel billet specifications
Reduce specification ambiguity before the enquiry is written.
- steel billet price
Understand the commercial inputs that shape a billet offer before you request pricing.
Expert insight
What does a current Q235B standard reference establish — and what still needs a billet-specific order agreement?
Source-backed procurement decision note
What the reference gives you
The official record for GB/T 700-2006 lists the standard as current. So a Q235B enquiry is pointing at a live national standard rather than a superseded one — and that is a real thing to have established before you commit to a grade. It tells you the authority exists and which document holds it.
The wrinkle worth knowing about
The same record shows a revision plan in progress. On its own that is unremarkable — standards of this age are routinely under review. It does change one thing, though: “the current edition” stops being a safe thing to leave implicit on a purchase order, because what is current is a moving target across the life of a contract.
Where the standard stops and the order begins
GB/T 700-2006 is a carbon structural steel standard. It defines a steel and a grade — what that steel is made of and what it is expected to do. It is not a billet specification. Section, cut length, tolerance basis, straightness, corner condition and surface acceptance are attributes of a semi-finished product, and they come from an agreement about the billet you are buying, not from the grade name you are buying it under.
What that means in practice
Read the reference as telling you which document governs the steel, and stop there. Then write the rest into the order yourself: the geometry with its tolerance basis, the surface criteria, the elements the certificate must report, and the marking that ties a bundle to its heat. If a substitution is being weighed, that is a fourth, separate exercise — a written comparison against both governing documents, filed where it can be found later.
Buyer implication. Lock the contract edition and the heat evidence, then define billet geometry and downstream suitability explicitly. Any cross-standard equivalence stays an engineering decision with a written record behind it.
Primary source
Standardization Administration of China — GB/T 700-2006 national standard recordMethod: the source status and scope are compared against the buyer's decision; what the source establishes is separated from what remains order-specific.
Scope & limitations
- Information date
- 2026-10-03
- Scope
- GB/T 700-2006 status as recorded in the national standard register, and the fact that a revision plan is shown in progress.
- Limitations
- The record establishes status, not grade chemistry, and not billet-form requirements. Buyers should verify the contract edition at order time and not infer billet-specific requirements from the grade name alone. The source does not prove Noor Deira Steel inventory, price, lead time, origin, certification or market coverage.
This note is an engineering aid for framing your own specification. It is not a certificate, an inspection report or a statement of compliance.
Buyer advantages
What this page does for you
Every point starts from something buyers actually raise with us, and ends at a check you can run yourself. Nothing here is a claim you have to take on trust — if you cannot verify it, it does not belong on the list.
“Which edition am I actually ordering against?”
The contract edition is a required input, and leaving the series number bare blocks the result outright.
You settle the edition before contracting rather than discovering the mismatch at certificate review.
“Does the grade give me my billet dimensions?”
Billet geometry is a required input with its own tolerance-basis question, handled separately from the grade.
The requirement the standard does not supply gets written down instead of assumed.
“Can we just use S235JR instead?”
Any proposed equivalence raises its own warning and a blocker requiring a written comparison against both documents.
A substitution becomes a recorded engineering decision rather than a conversation nobody minuted.
“Could two heats end up mixed?”
Grade separation sits in the verification matrix as a mill-handling requirement with a named acceptance owner.
Mixed lots stop being something nobody thought to ask about until traceability is already lost.
“Will the MTC prove the grade?”
Heat evidence and the element list are named separately from the certificate itself, with traceability treated as a marking requirement.
The document you receive supports acceptance rather than merely accompanying the shipment.
“Am I being handed assumptions?”
No composition, mechanical property or tolerance value is asserted anywhere on this page.
Nothing looks settled that your own order and the controlled standard have not settled.
From enquiry to delivery
Who owns each step
Eight stages, from a grade appearing on a drawing to the bundle arriving at your gate. Each one names the question you are answering, what you need in hand, who is waiting on whom, and what slips when it is done late.
- Stage 1
Downstream product defined
- Buyer concern
- What must the finished product do?
- Required input
- The finished product's own standard and its test requirements
- Output
- A requirement the grade can be judged against
- Risk
- A grade chosen without it is chosen on familiarity, not suitability
Next: Write the requirement into the enquiry before naming a grade
- Stage 2
Edition and grade fixed
- Buyer concern
- Which text will the certificate be held to?
- Required input
- GB/T 700-2006 stated in full, with the designation including its class
- Output
- A grade that can be assessed against a named edition
- Risk
- A bare series number leaves the certificate with nothing to answer to
Next: Run the order-basis checker and carry the reference into the enquiry
- Stage 3
Billet geometry agreed
- Buyer concern
- What exactly is being delivered?
- Required input
- Section, cut length and the dimensional tolerance basis, as an order clause
- Output
- A billet-form requirement that can be enforced at intake
- Risk
- Material arrives that nobody can judge conforming or not
Next: Confirm the tolerance basis in writing before the order is issued
- Stage 4
Substitution decided, if raised
- Buyer concern
- Is another designation being accepted in place of this one?
- Required input
- Both governing documents, compared element by element
- Output
- A written engineering justification, or a decision not to substitute
- Risk
- An unrecorded substitution is an unverified material
Next: File the comparison with the order, or decline the substitution
- Stage 5
Heat evidence agreed
- Buyer concern
- What must the certificate report?
- Required input
- The element list and the marking that ties a bundle to its heat
- Output
- Agreed certificate content and traceability arrangement
- Risk
- A certificate omitting a relied-on element cannot support acceptance
Next: Confirm the content in writing before accepting the offer
- Stage 6
Quotation
- Buyer concern
- On what basis is the offer made?
- Required input
- Named place or port, Incoterm 2020, currency, mass basis and document set
- Output
- A comparable offer with open items listed
- Risk
- An unstated basis becomes a settlement dispute
Next: Compare the offer against the alternatives on this page
- Stage 7
Intake verification
- Buyer concern
- Does the evidence hold up?
- Required input
- Certificate, dimensional and surface records, heat traceability
- Output
- Acceptance against the stated criteria, or a documented non-conformity
- Risk
- Acceptance judged against a criterion nobody wrote down
Next: Close out against the agreed terms in the order
- Stage 8
Shipment
- Buyer concern
- Who carries risk, and when?
- Required input
- Incoterm rule and the named place or port
- Output
- Freight and insurance arranged to the agreed point
- Risk
- Risk transfers at a point the buyer did not expect
Next: Confirm the risk-transfer point in writing
Buyer FAQ
Questions that decide the order
The five that come up most often once a buyer already knows what Q235B refers to and is trying to get the order right. If you are still working out what the designation means, the sections above will get you there faster.
Is GB/T 700-2006 still current?
The official record lists GB/T 700-2006 as current. It also shows a revision plan in progress, which is worth knowing if your order runs months out: the edition in force at the time of contracting is the one your certificate should be held to, and that can differ from the edition in force today. Check the record again at order time rather than relying on this page.
Does Q235B define billet dimensions?
No. GB/T 700-2006 is a carbon structural steel standard, and a grade inside it defines a steel — not a billet geometry. Section, cut length, straightness, corner condition and their tolerances are billet-form requirements, and they have to be stated on your order unless the applicable controlled text explicitly covers the semi-finished form. Assuming dimension rules transfer from the grade name is one of the more common ways a billet order goes wrong.
Can Q235B be treated as equivalent to S235JR or 3SP?
Not without separate engineering review. They are designations under different national standards, and no standard declares any of them interchangeable. Where a substitution is genuinely needed, it has to be worked through as a written comparison against both governing documents, with the limits one addresses and the other does not listed as open items, and the conclusion filed with the order. Similar-sounding grade numbers are not evidence of equivalence.
Which edition should appear on the purchase order?
The edition your contract is placed against, stated in full — GB/T 700-2006 rather than “GB/T 700”. Naming the edition is what lets the certificate be assessed against a defined text, and it matters more than usual here because the record shows a revision in progress. If your project documents cite a different edition, resolve which one governs before the order is issued rather than after material ships.
What heat and dimensional evidence should be requested?
The mill test certificate carrying the heat analysis, with the elements your specification relies on named explicitly, plus the heat number marked on the bundle so a delivered lot can be traced back to that analysis. On the dimensional side, a record stating the tolerance basis it was measured against — a measured value without its basis cannot be judged conforming or not. Agree both before dispatch, while heat identity still exists.
Chemistry
Where the composition limits for your Q235B order come from
A grade designation points at a chemistry table; it is not the table. There are four ways a Q235B order's composition gets fixed in practice. Three hold up under scrutiny. One is how buyers end up with material nobody can properly accept.
The grade table in GB/T 700-2006
The composition limits the standard assigns to Q235B. The cleanest basis, because the certificate is held to a published text — provided the contract edition is named on the order rather than left as a series number.
Order-specific agreed limits
Where your product needs something the standard does not address, those limits are written into the order. They bind the order that defines them and should not be carried into a later enquiry without re-agreement.
Borrowed from another standard
Limits taken from S235JR, 3SP or any other mark and applied because the grades are believed to match. This is the failure mode this page exists to prevent: it produces a specification neither document supports.
Not yet established
The enquiry carries a designation and no composition basis at all. A heat analysis cannot be accepted or rejected against it, so the order gets resolved by whatever the supplier issues rather than by your requirement.
No values appear here. The composition limits that apply to a Q235B billet belong to the edition of the standard you are contracting against and to any agreement written into your order. Printing a range on this page would invent a specification, which is the opposite of what a procurement page should do. Ask for the applicable limits with your enquiry and hold the certificate to them.
Equivalents
Why “Q235B is basically S235JR” costs you more than it saves
It is the most common thing buyers say about this grade, and it is the shortcut that causes the most trouble. Q235B and S235JR come from different national standards with different committees, different limits and different testing bases. Here is what a real comparison involves, and what happens without one.
What a real comparison involves
- Both governing documents named by number and edition, never by trade shorthand.
- Composition and property limits placed side by side from the two texts, element by element.
- Every limit one document addresses and the other does not, listed as an open item rather than treated as satisfied.
- Any impact or testing basis difference called out explicitly, since the class letter and the JR suffix are not the same guarantee.
- The intended downstream product tested against both sets of requirements, not against an average of them.
- The conclusion, and who approved it, written down and filed with the order.
What goes wrong without one
- Material is accepted against a specification neither standard wrote, so acceptance cannot be defended if it is questioned.
- A single element or test basis falls outside the intended document's limits and surfaces only when the rolled product fails its own testing.
- The certificate looks correct, because it was issued against the designation that was ordered — the problem is that the ordered designation was the wrong one.
- Responsibility is disputed at intake, with no written comparison to show what anyone agreed.
- Replacement material is needed on a lead time nobody planned for, which is the expensive part of the error.
Our position. No equivalence between Q235B and any other designation is asserted on this page, in either direction. Where a buyer raises one, the checker records it as a separate engineering case — never as a translation between two names for the same material.
MTC requirements
What the mill test certificate has to show for a Q235B order
The certificate is what makes a Q235B order checkable. It is also routinely asked to establish things it was never designed to establish. Here is the split, and what to do when one arrives on the wrong side of it.
Heat analysis
The composition of the heat the billet came from, and the certificate's central function for semi-finished product. Name the elements that must be reported rather than accepting a standard list.
The edition it was issued against
The certificate should name GB/T 700-2006 and the edition the contract is placed on. This matters more than usual here, because the register shows a revision in progress and “current” is not a stable reference across a long contract.
Heat number and bundle identity
The heat number connects the document to physical material, and only works if the same number is marked on the bundle that arrives. It has to survive handling to the point of intake.
Grade separation record
Where several heats or grades move through one program, the handling arrangement needs to be documented. A certificate per heat proves nothing about which heat went into which charge.
Dimensional record and its basis
Where dimensions are certificated, the record states the tolerance basis it was measured against. A measured value without its basis cannot be judged conforming or not.
What it cannot establish
Mechanical properties of the finished product, the mill's process capability, and any equivalence to another designation. Those are separate evidence held by different parties.
No certificate is promised here. Nothing on this page asserts that a mill test certificate, approval or test report is held, issued or available, or that any particular element will be reported. The document, its content, its issuing party and its timing are agreed against your order.
Qualified RFQ
Tell us the grade and the billet
The grade is one line. The billet is the rest of the enquiry, and the more of it you supply, the more of our reply is an answer rather than an assumption. Anything you have not decided stays an open item.
- Product and entity
- Contract edition in full
- Designation with its class letter
- Billet section and cut length
- Dimensional tolerance basis
- Surface and end acceptance criteria
- Downstream product and its standard
- Any equivalence under consideration
- Heat-analysis and document requirements
- Quantity with unit of measure
- Destination, named place or port
- Incoterm 2020 and your timing
The RFQ goes to the Steel Billet enquiry intake. Your order-basis record travels with it.
Contact the commercial department
- WhatsApp / Mobile
- +971 56 398 0860
- Address
- Office 1015, Churchill Executive Tower, Business Bay, Dubai, United Arab Emirates
- Working hours
- Monday – Saturday: 8.00 AM – 6.00 PM · Sunday: Closed
Technical review is handled at organisation level through the commercial department. No individual contact is named on this page.