Q460D QT Carbon Steel Plate GB/T 16270 Supplier

Q460D, also searched as GB/T 16270 Q460D, Q460D QT plate, Q460D carbon steel plate, Q460D steel plate and Q460D quenched and tempered plate, is the 460 MPa quality-grade-D grade in GB/T 16270. That standard covers high-strength structural steel plate delivered quenched and tempered. Q is the yield symbol, 460 is the thin-plate minimum yield in MPa, and D is the quality letter for Charpy impact at −20°C.

Q460D is not GB/T 1591 Q460D. GB/T 1591 is the high-strength low-alloy structural book and allows as-rolled, normalized or TMCP delivery. GB/T 16270 Q460D is a QT plate. A certificate that only says Q460D under GB/T 1591 does not meet this page. Crane, mine-truck and excavator buyers should write GB/T 16270 on the order.

Quality grade D sits between C and E. C is 0°C. D is −20°C. E is −40°C. F is −60°C. Q460D is the usual choice for winter fabrication in temperate regions and for equipment that sees occasional sub-zero nights but not arctic design. If the drawing says −40°C, Q460D is the wrong letter.

EN 10025-6 does not have a −20°C letter. S460Q is tested at 0°C. S460QL is tested at −40°C and lines up more closely with Q460E. Q460D is the grade between those two. Dual mark only when both books are fully met. See EN 10025-6 steel plate.

SHH STEEL is a global steel mill sourcing partner and steel manufacturer and exporter, mill-direct, China origin. We source Q460D 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 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 ordered, follows GB/T 222. Grade D is tighter on phosphorus and sulfur than grade C, because the impact test is colder. Mills still add Nb, V, Ti or Al for grain refinement, and may add Cr, Ni, Mo or B by thickness. The certificate shows the elements actually used.

Heat Analysis and Product Analysis — GB/T 16270 Q460D

If the purchase order writes product analysis, SHH STEEL prints both columns and the thickness band used for the tensile test. Do not treat this chemistry as weathering plate. Do not treat it as S355JR.

Buyers search Q460D mechanical properties, Q460D yield strength, GB/T 16270 Q460D tensile and Q460D impact −20°C.

Tensile and impact — GB/T 16270 Q460D

Impact energy is the average of three longitudinal Charpy V-notch specimens. One value may fall below the table, but not below 70% of that value. A typical production heat is at or above 34 J at −20°C. Write a higher energy on the order if the owner requires it.

Yield steps down with thickness. A 460 MPa name on 20 mm plate is not the minimum on a 120 mm flange. SHH STEEL quotes the thickness band on the offer.

Density is 7.85 g/cm³. Hardness after temper is a mill control, not a design value. Z15, Z25 or Z35 through-thickness tensile is an extra.

There is no official one-to-one substitute for Q460D. What buyers compare is a 460 MPa QT plate tested at −20°C.

EN 10025-6 jumps from 0°C on S460Q to −40°C on S460QL. Q460D sits in the gap. Some files accept S460Q if the extra impact at −20°C is written. Others step up to S460QL. SHH STEEL will not make that choice on a silent order.

In the United States, A572 Grade 65 is not this QT book. A514 is a 100 ksi family. In Japan, SM570 is a welded structural grade, not this plate. In China, GB/T 1591 Q460D is the name most often confused with GB/T 16270 Q460D.

Buyers pick Q460D when a welded frame, boom or chassis wants 460 MPa yield, QT delivery and impact at −20°C. Search phrases such as Q460D steel plate, GB/T 16270 Q460D and Q460D QT plate all point here.

It is the wrong plate for a 0°C-only file that can use Q460C. 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. That work sits on ASTM A516 or pressure vessel steel plates. It is the wrong plate for an unpainted weathering girder.

SHH STEEL supplies this plate when the drawing names GB/T 16270 and quality grade D.

Q460D is weldable QT carbon plate. The plate has already been quenched and tempered. A procedure written for S355JR is not a Q460D 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 −20°C test temperature is checked.

Preheat follows thickness, hydrogen and the approved WPS. Interpass temperature should stay below the mill temper range, or 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 Q460D is quenched and tempered. Austenitize typically in the 880–930°C range, quench, then temper in the window that holds 460 MPa yield and the −20°C impact. Exact temperatures stay on the mill process sheet.

Do not order Q460D as as-rolled or TMCP unless the contract leaves GB/T 16270. Stress relief after fabrication, if used, must stay below the original temper temperature.

The certificate lists GB/T 16270 Q460D, heat number, heat analysis, product analysis when ordered, tensile by thickness band, and −20°C impact. Certificates may be EN 10204 3.1 or EN 10204 3.2. Dual marking to S460Q or S460QL is available only when both books are fully met.

Usual supply range from SHH STEEL for Q460D 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 Q460D follow GB/T 709 unless the purchase order names another table.

Typical thickness tolerance idea for Q460D 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 Q460D unless the order says so.

Q460D already defines 460 MPa yield, QT delivery and −20°C impact. Extra items still have to be written on the purchase order.

Book name. Write GB/T 16270 Q460D. Do not write only Q460D.

Impact. Grade D is −20°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, Q460D, thickness and mill logo.

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

Q460D is the plate for a 460 MPa QT file tested at −20°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 Q460D 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 Q460D 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 −20°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 Q460D, keep the QT route, and do not ship GB/T 1591 Q460 as this plate. We will not change D to C to save a test, and we will not treat Q460D as S355. If the drawing needs −40°C, we will move the inquiry to Q460E and keep the price on the right grade.

Q460D QT carbon steel plate to GB/T 16270 is 460 MPa quenched-and-tempered structural plate with impact at −20°C. Whether the inquiry says Q460D, GB/T 16270 Q460D, Q460D QT plate or Q460D carbon steel plate, SHH STEEL as a global steel mill sourcing partner supplies plate with Q460D chemistry, heat and product analysis as ordered, GB/T 709 tolerances and EN 10204 3.1 or 3.2 certification.

SHH STEEL supplies Q460D 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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