Q460C QT Carbon Steel Plate GB/T 16270 Supplier

Q460C, also searched as GB/T 16270 Q460C, Q460C QT plate, Q460C carbon steel plate, Q460C steel plate and Q460C quenched and tempered plate, is the 460 MPa quality-grade-C grade in GB/T 16270. That standard covers high-strength structural steel plate delivered in the quenched and tempered condition. The letter Q is the first letter of the Chinese word for yield. 460 is the minimum yield in MPa on the thin-plate band. C is the quality symbol for Charpy impact at 0°C.

This is not a GB/T 1591 Q460 plate. GB/T 1591 covers high-strength low-alloy structural steel that can be delivered as-rolled, normalized or TMCP. GB/T 16270 Q460C is a QT plate. A certificate that only says Q460C under GB/T 1591 is not this product. Buyers who need a crane boom, mine-truck frame or excavator body should write GB/T 16270 on the purchase order.

Q460C is the lowest strength grade still kept in the 2009 edition. The 1996 edition also listed Q420. That grade was removed when the book was rewritten as quenched-and-tempered plate only, thickness was extended, and Q800, Q890 and Q960 were added. Quality grade C means the impact test temperature is 0°C. D is −20°C, E is −40°C, F is −60°C. If the drawing shows arctic or high-altitude winter service, Q460C is usually the wrong quality letter.

The European comparison most buyers use is EN 10025-6 S460Q. S460Q is the 0°C QT grade. S460QL is the −40°C grade and lines up more closely with Q460E, not Q460C. S460QL1 is colder again. Do not swap these letters on a silent order. See EN 10025-6 steel plate for the full QT family.

SHH STEEL is a global steel mill sourcing partner and steel manufacturer and exporter, mill-direct, China origin. We source Q460C from first-line QT mills, print heat analysis and product analysis when ordered, and ship plate to fabricators in the United States, Europe, the Middle East, Southeast Asia, Africa and South America. Related category pages include high strength low alloy plates and structural steel plates.

Nearby pages that buyers compare, but must not swap blindly, include S460Q, S460QL and S500Q.

Heat analysis is the mill ladle table in GB/T 16270. Product analysis, when the purchase order asks for it, follows the permitted deviation in GB/T 222. Q460C is a low-alloy QT carbon plate. Mills add one or more of Nb, V, Ti or Al for grain refinement, and may add Cr, Ni, Mo or B according to thickness. The certificate must show the elements actually used.

Heat Analysis and Product Analysis — GB/T 16270 Q460C

Grade C allows a slightly wider phosphorus and sulfur window than grade E or F. That is acceptable at 0°C. It is not a reason to use Q460C on a −40°C drawing. If the file needs product analysis, SHH STEEL prints both columns and the thickness band used for the mechanical test.

Do not treat this chemistry as weathering plate. Q460C has no mandatory copper-chromium patina window. Do not treat it as S355JR. S355JR is ordinary structural steel and is not quenched and tempered to 460 MPa.

Buyers search Q460C mechanical properties, Q460C yield strength, GB/T 16270 Q460C tensile and Q460C impact 0°C.

Tensile and impact — GB/T 16270 Q460C

Impact energy is reported as the average of three longitudinal Charpy V-notch specimens. One specimen may fall below the table value, but not below 70% of that value. Typical grade C energy on a production heat is at or above 34 J at 0°C. Write the energy on the purchase order if the owner wants a number higher than the book minimum.

Yield steps down as thickness increases. A 460 MPa name on a 120 mm flange is not the same minimum as on a 20 mm web. SHH STEEL quotes the thickness band on the offer so the design office does not use the thin-plate yield on heavy plate.

Density is 7.85 g/cm³. Hardness after temper is a mill control, not a design value. Through-thickness tensile, when ordered as Z15, Z25 or Z35, is an extra and is not included in the base Q460C table.

There is no official one-to-one substitute for Q460C. What buyers compare is a 460 MPa QT plate tested at 0°C.

In Europe the closest name is S460Q. S460QL and S460QL1 are colder. In the United States shops sometimes compare ASTM A514 around 100 ksi, which is a different strength family, or A572 Grade 65, which is not QT to this book. In Japan there is no direct JIS twin. SM570 is a welded structural grade and is not this QT plate. In China, GB/T 1591 Q460C is the name most often confused with this grade. Delivery condition and the standard number decide the certificate.

Buyers pick Q460C when a welded frame, boom section or chassis plate wants 460 MPa yield, a QT delivery and impact at 0°C. Search phrases such as Q460C steel plate, GB/T 16270 Q460C and Q460C QT plate all point here.

It is the wrong plate for a −40°C mine site. That work is Q460E. It is the wrong plate for a 690 MPa boom. That work is Q690D or Q690E in the same book. It is the wrong plate for a pressure vessel. Vessel plate sits on ASTM A516 or pressure vessel steel plates. It is the wrong plate for an unpainted weathering girder. That work is a weathering grade, not Q460C.

SHH STEEL supplies this plate to equipment builders and structural fabricators when the drawing actually names GB/T 16270 and quality grade C.

Q460C is weldable QT carbon plate. Carbon is controlled, but the plate has already been quenched and tempered. A workshop procedure written for S355JR is not a Q460C procedure.

Typical consumables are matching 460–550 MPa low-hydrogen electrodes or wires, qualified on a QT 460 MPa family. E7018-class electrodes are often under-matched if the joint must develop full plate strength. A procedure written for S460QL is a useful starting point after the impact temperature is checked.

Preheat follows thickness, hydrogen and the approved WPS. Interpass temperature should stay below the temper range used by the mill, or the heat-affected zone and the local yield can drop. After heavy cold forming, a stress relief may be required. The fabricator owns the WPS. SHH STEEL can share mill heat data, product analysis and carbon equivalent for that review.

Usual delivery from SHH STEEL for Q460C is quenched and tempered. Austenitize typically in the 880–930°C range, quench, then temper in the mill window that holds 460 MPa yield and the 0°C impact. The exact temperatures stay on the mill process sheet.

Do not order Q460C as as-rolled or as TMCP unless the contract deliberately leaves GB/T 16270. Normalized delivery is a different book. Stress relief after fabrication, if used, must stay below the original temper temperature.

The certificate lists GB/T 16270 Q460C, heat number, heat analysis, product analysis when ordered, tensile by thickness band, and 0°C impact. Certificates may be EN 10204 3.1 or EN 10204 3.2. Dual marking to S460Q is available only when both books are fully met.

Usual supply range from SHH STEEL for Q460C QT carbon steel plate:

• Thickness: commonly 8 mm – 100 mm, heavier plate to 150 mm by enquiry
• Width: 1500 mm – 3800 mm
• Length: 3000 mm – 12000 mm

Cut-to-size webs, flanges and base plates are available. Browse more sizes on structural steel plates and the products index.

Dimensional limits for Q460C follow GB/T 709 unless the purchase order names another table.

Typical thickness tolerance idea for Q460C QT plate

Width on 1500–3800 mm plate is commonly held to about ±20–25 mm unless a tighter extra is named. Length on 3000–12000 mm plate is commonly held to about +50 / 0 mm or ±25 mm by mill practice. Flatness after QT follows the agreed class. SHH STEEL will not assume a zero-minus extra on Q460C unless the order says so.

Q460C already defines 460 MPa yield, QT delivery and 0°C impact. Extra items still have to be written on the purchase order.

Book name. Write GB/T 16270 Q460C. Do not write only Q460C.

Impact. Grade C is 0°C. Write a higher energy if the owner requires it.

Product analysis. Write it if the file needs the second chemistry column.

Through-thickness. Z15, Z25 or Z35 when the joint is loaded through the thickness.

NDE. UT to GB/T 2970 or the named class.

Heat-treatment record. QT temperatures when the inspector asks.

Identification. Heat number, Q460C, thickness and mill logo.

Third-party witness. EN 10204 3.2 with SGS, TÜV, BV, ABS or the inspector named.

Q460C is the plate for a 460 MPa QT file tested at 0°C. It is the wrong plate for a painted warehouse that can use S355JR. It is the wrong plate for a 690 MPa member.

SHH STEEL sources Q460C from first-line Chinese QT mills and ships it on worldwide terms. Partner mills include Wuyang (Wugang), Angang, Shougang, Hanye, Anyang Iron and Steel, Baosteel, Xinyu, Xingcheng and other qualified mills when the size requires it.

Mill test certificates are issued to EN 10204 3.1 as standard. EN 10204 3.2 is arranged when the order names a third-party hold point.

Usual rolling thickness: 10 mm, 12 mm, 16 mm, 20 mm, 25 mm, 30 mm, 32 mm, 40 mm, 50 mm, 60 mm, 80 mm, 100 mm.

Processing: CNC or flame cutting, bevel, flattening, shot blast, UT to the named class.

Trade terms: FOB Shanghai main, CIF destination available. Payment: TT, LC, or TT + LC.

Ocean time from Shanghai: US West 14–18 days; US Gulf 28–35 days; Rotterdam / Antwerp 28–35 days; Jebel Ali 18–25 days; Singapore 7–12 days; other ports quoted.

Third-party: SGS, TÜV, BV, ABS, CCS, GL, VL, DNV, RINA, NK, KR, or the inspector named.

SHH STEEL is a global steel mill sourcing partner with mill partnerships in China. We supply GB, ASTM, ASME, EN, DIN and JIS steel to buyers in the United States, Europe, the Middle East, Southeast Asia, Africa and South America. Origin is mill-direct, China origin.

SHH STEEL has supplied steel plates to the USA, Mexico, Argentina, Peru, El Salvador, Spain, Netherlands, Germany, UAE, Saudi Arabia, South Africa, India, Thailand, Singapore, Vietnam, the Philippines, Japan and Korea.

Typical lead time: ex-stock 5–7 days when plate is in yard; standard QT rolling about 35–45 days; 3.2 inspection about 45–60 days.

SHH STEEL is a global steel mill sourcing partner and steel manufacturer and exporter, mill-direct, China origin. For Q460C that means mill-direct QT price, not a multi-layer stockist mark-up. We buy from mills that already run the 460 MPa quench-and-temper route, so the heat carries the 0°C impact without a second upgrade charge.

Delivery is short when the size is in rolling range: ex-stock 5–7 days, standard heat about 35–45 days, 3.2 inspection about 45–60 days. Cutting, bevel and UT can run in the same window. FOB Shanghai is the main term. CIF to US West, US Gulf, Rotterdam, Jebel Ali and Singapore is quoted on the same file.

Experience on this grade is simple: print GB/T 16270 Q460C, keep the QT route, and do not ship GB/T 1591 Q460 as this plate. We will not change C to E on the certificate to win an order, and we will not treat Q460C as S355. If the drawing needs −40°C, we will move the inquiry to Q460E and keep the price on the right grade.

Q460C QT carbon steel plate to GB/T 16270 is 460 MPa quenched-and-tempered structural plate with impact at 0°C. Whether the inquiry says Q460C, GB/T 16270 Q460C, Q460C QT plate or Q460C carbon steel plate, SHH STEEL as a global steel mill sourcing partner supplies plate with Q460C chemistry, heat and product analysis as ordered, GB/T 709 tolerances and EN 10204 3.1 or 3.2 certification.

SHH STEEL supplies Q460C QT Carbon Steel Plate to the United States, Europe, the Middle East, Africa, Asia and the Americas for work that actually names this grade.

Contact SHH STEEL for mill rolling, QT route, cutting, UT, 3.2 inspection or a worldwide quotation.

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