Global Steel Supply & Processing
Request quenched-and-tempered Q460C structural plate to GB/T 16270-2009. Compare strength by ordered thickness, 0°C Charpy toughness, heat-number traceability, dimensions and export quotation before placing your purchase order.
Define the governing steel-plate standard, Q&T processing and grade-specific test scope. A similarly named structural section grade is not an automatic substitute.
| Purchase field | What to specify / verify |
|---|---|
| Product identity | Q460C quenched and tempered high-strength structural steel plate; quality grade C. |
| Governing steel-plate standard | GB/T 16270-2009 for Q&T plate. Confirm the edition on the purchase order and MTC. |
| Mechanical-property coverage | Nominal plate thickness up to 150 mm in three standard property bands; actual mill rolling and Q&T capacity must be checked. |
| Delivery condition | Quenched and tempered (Q&T). Obtain heat-treatment confirmation for the exact supplied heat and thickness. |
| Yield strength | 460 MPa up to 50 mm; 440 MPa above 50 to 100 mm; 400 MPa above 100 to 150 mm. |
| Tensile strength | 550–720 MPa through 100 mm; 500–670 MPa above 100 to 150 mm. |
| Charpy toughness | 0°C; longitudinal absorbed energy at least 47 J for standard-sized specimens, subject to standard sampling rules. |
| Carbon equivalent | CEV maximum: 0.47% through 50 mm; 0.48% above 50 to 100 mm; 0.50% above 100 to 150 mm. |
| Dimensional requirement | Specify thickness × width × length, GB/T 709 tolerance class, surface/flatness, edges and number of pieces. |
| Supporting documents | Mill test certificate with heat identity, analysis, tensile/impact data, Q&T condition and supplementary inspection if ordered. |
The 460 MPa grade name does not mean that 460 MPa applies to every plate thickness. Match the quoted thickness to its property band.
| Plate thickness | Min. yield (MPa) | Tensile (MPa) | Min. elongation |
|---|---|---|---|
| ≤50 mm | 460 | 550–720 | 17% |
| >50–100 mm | 440 | 550–720 | 17% |
| >100–150 mm | 400 | 500–670 | 17% |
Values refer to Q460C Q&T plates under GB/T 16270-2009. When an upper-yield point is not distinct, the specified proof-strength method applies according to the standard. Actual plate certificates must state the test result and sample orientation.
Share the exact finished thickness, number of plates and required yield/Charpy values; we verify what the producing mill can supply.
The percentages below are maximum limits or conditional alloying ceilings, not a fixed recipe; review the actual heat analysis and microalloy additions on the MTC.
| Element | Max. content (%) |
|---|---|
| C | 0.20 |
| Si | 0.80 |
| Mn | 1.70 |
| P | 0.025 |
| S | 0.015 |
| Cr | 1.50 |
| Ni | 2.00 |
| Element | Max. content (%) |
|---|---|
| Cu | 0.50 |
| Mo | 0.70 |
| V | 0.12 |
| Nb | 0.06 |
| Ti | 0.05 |
| B | 0.0050 |
| Nominal thickness | Maximum CEV | Procurement use |
|---|---|---|
| ≤50 mm | 0.47% | Include heat-specific CEV in the WPS review. |
| >50–100 mm | 0.48% | Review preheat and hydrogen control for the actual section. |
| >100–150 mm | 0.50% | Validate heavier-section weld procedure and toughness. |
CEV formula: C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15. Microalloying and fine-grain requirements follow the standard and the actual approved mill route. Chemical analysis limits should not be confused with alloy additions guaranteed in every heat.
Confirm test temperature, specimen size, sample direction and number of tests on the mill certificate. The baseline is for full-sized longitudinal specimens.
Quality grade C uses 0°C as its standard impact test temperature in this Q&T plate specification.
Minimum average absorbed energy for the specified standard-size longitudinal Charpy V-notch specimen.
Verify sampling, one-piece allowance and reduced-size specimen rules from the standard and actual certificate.
Provide minimum absorbed energy, temperature, specimen orientation, impact test frequency and any third-party witness requirement.
The heat-treatment route is part of the specified product identity. Verify the production mill, thermal cycle and final test data rather than relying on the grade name alone.
GB/T 16270-2009 covers quenched-and-tempered structural steel plate. The actual mill controls austenitization, cooling and tempering to meet mechanical and toughness requirements within its approved production route.
High-strength plate selection supports structural weight and load targets only when the material is approved in the design, weld procedure and fabrication specification.
Box sections, welded booms and highly loaded support plates where the design calls for verified high-strength material.
Load-carrying machinery structures and fabricated supports. Abrasion-facing liners require a separate wear-grade assessment.
Fabricated high-strength beams, box structures and reinforcing sections engineered for the specified service.
Structural members for heavy vehicles and machinery when matching thickness, fatigue and weld procedures are approved.
Welded equipment supports and machinery bases with defined proof-strength and traceability needs.
Project-specific structural plate uses only where the relevant design and acceptance rules explicitly permit this material.
Engineering suitability must be validated from the project load cases, fatigue and buckling criteria, welding qualification and applicable structural code. This plate is not marketed as an interchangeable wear-resistant steel or as pressure-vessel steel.
For Q460C, the source heat-treatment route, certificate and cutting dimensions have to match the contract just as closely as price and lead time.
Keep GB/T 16270, Q460C, Q&T, thickness band and 0°C impact requirements visible in the quote.
We confirm the specific producing mill, heat-treated plate dimensions and quantities before supply commitment.
Coordinate a matching MTC with chemistry, carbon equivalent, tensile, impact and delivery condition.
Align packaging, plate identification, Incoterm, cut list and dispatch records with the order.
BAOSTEEL METAL company-wide profile: approximately 8 million MT annual output, 1 million MT regular inventory, 500,000 m² operating area and 1,000+ employees. These are company-level figures, not a statement of Q460C production tonnage, approved mill capacity or Q460C stock availability.
Q460C quenched-and-tempered plate supply depends on rolling dimensions, Q&T facilities, tested thickness and actual inventory. We check these against the required order quantity.
Document control links the actual supplied plates to the test heat. State any third-party inspection or supplementary standards before manufacture.
| Purchase field | What to specify / verify |
|---|---|
| Material identity | Q460C, GB/T 16270-2009 and steelworks or producer identity. |
| Heat number | Matching heat / plate identification and ordered dimensions. |
| Chemistry | Heat analysis, fine-grain additions and CEV calculated to specified limits. |
| Tensile tests | Test thickness, yield, tensile, elongation and specimen record. |
| Impact tests | 0°C Charpy V-notch temperature, longitudinal results and specimen size. |
| Heat treatment | Q&T delivery condition, with agreed thermal record where requested. |
| Optional checks | UT acceptance, Z-direction quality, dimensional inspection and third-party witnessing only when agreed. |
Specify the test method, acceptance level, sampling frequency, certificate format and any nominated inspection agency.
High strength Q&T plate requires a qualified welding route suited to thickness, restraint, hydrogen level and heat-affected-zone toughness. The actual heat chemistry is more useful than a single generic preheat number.
Build the RFQ around the finished plate geometry, surface requirement and any necessary cutting list, while keeping mill heat marks traceable.
Choose the actual finished thickness band, tolerance class and flatness criterion. Dimensional tolerances can reference the ordered GB/T 709 edition where applicable.
Specify mill or cut edges, identification marks, surface acceptance, corrosion protection and shipping supports appropriate to heavy plates.
Estimate theoretical mass for a plate list before RFQ. The density is a standard planning assumption; the purchase weight is governed by actual dimensions and commercial terms.
Formula: thickness × width × length × 7.85 × 10⁻⁶ = kg per plate (dimensions in mm). Multiply by quantity; divide kg by 1,000 for metric tonnes.
Include piece quantities, finished sizes, drawing revisions, tolerances, required edge quality and heat-number transfers.
Processing is offered subject to thickness, steel condition, drawing and workshop capacity; the resulting parts retain the original material heat identity.
Review kerf, thermal effects and dimensional allowance for Q&T high-strength plate.
Where plate thickness and equipment permit, evaluate CNC laser or alternative cutting technology.
Agree bevels, holes, marking and any extra inspection needed after processing.
Thermal cutting and subsequent forming can change local properties. The purchaser’s fabricator should approve the procedure for the relevant part design, plate thickness and Q&T condition.
Order execution includes steel plate identification, matching documents, stable handling and agreed transport terms. Packaging is selected around the actual plate dimensions and route.
Compare the design strength, quality level, impact temperature and applicable material standard. These grades require independent procurement approval.
Higher-strength Chinese plate grade; verify its own property thickness bands and D-class impact requirement.
Higher strength category with distinct heat treatment and toughness requirements.
EN 10025-6 quenched and tempered structural steel with its own certification route.
ASTM quenched-and-tempered structural plate; not a direct Q460C equivalent.
Separate normalized/thermomechanical grades under GB/T 1591 with different material conditions.
Lower nominal structural strength class under a different ASTM standard.
Related products are shown for technical navigation. Add live internal links only when the corresponding WordPress pages are published; no alternative grade is approved without the design authority.
Order the exact material form, Q&T condition and full test-document package before approving the production route.
It is a high-strength structural steel plate grade available in the quenched-and-tempered condition under GB/T 16270-2009. Quality grade C specifies 0°C impact testing.
For this page use GB/T 16270-2009. GB/T 1591-2018 also uses the Q460C name for a hot-rolled section/bar route; verify the product form, suffix and precise standard.
No. Q&T Q460C plate has minimum yield 460 MPa through 50 mm, 440 MPa above 50–100 mm and 400 MPa above 100–150 mm.
GB/T 16270 Q460C plate lists 550–720 MPa to 100 mm and 500–670 MPa above 100 to 150 mm.
Grade C has a 0°C reference with minimum average longitudinal Charpy energy 47 J for standard-size samples. Confirm the actual test and sample size on the mill certificate.
Yes. The product specified on this page follows the GB/T 16270 quenched-and-tempered plate route. Confirm treatment state on the MTC.
The CEV maximum is 0.47% up to 50 mm, 0.48% above 50–100 mm and 0.50% above 100–150 mm. Weldability depends on actual chemistry, section and WPS.
No automatic equivalence applies. Product standards, strength, toughness and delivery states differ; any substitution must be assessed and approved for the project.
Cutting and other preparation can be reviewed against drawing, thickness and available workshop capacity, while retaining heat traceability.
Provide grade, exact standard, Q&T condition, plate sizes and quantity, surface and flatness requirements, Charpy or supplementary tests, MTC format, Incoterm and destination.
Send the GB/T 16270-2009 requirement, finished thickness, width, length, quantities, 0°C Charpy and CEV needs, Q&T documentation, optional cutting and destination. We check mill availability and respond with a quotation scope.
Send your required grade, dimensions, quantity and destination. Our team will review the inquiry.
