Q690E QT Carbon Steel Plate GB/T 16270 Supplier

Q690E, also searched as GB/T 16270 Q690E, Q690E QT plate, Q690E carbon steel plate, Q690E steel plate and Q690E quenched and tempered plate, is the 690 MPa quality-grade-E grade in GB/T 16270. That standard covers high-strength structural steel plate delivered quenched and tempered. Q is the yield symbol, 690 is the thin-plate minimum yield in MPa, and E is the quality letter for Charpy impact at −40°C.

Q690E is the grade most buyers compare with European QL plate at 690 MPa. C is 0°C. D is −20°C. E is −40°C. F is −60°C. Cold-region crane and mine-truck builders use Q690E when the member was sized at 690 MPa and the specification names −40°C. A Q690C heat tested only at 0°C cannot be stamped E.

The closest European name is EN 10025-6 S690QL. Both are about 690 MPa QT plate tested at −40°C. S690Q is 0°C and lines up with Q690C. S690QL1 is −60°C and lines up with Q690F. On the US side, A514 Grade Q is also 100 ksi / 690 MPa QT structural plate. The books are not the same, and A514 does not carry an E letter. Dual mark only when both tables 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 Q690E 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 S690QL, S690Q and A514 Gr.Q.

Heat analysis is the mill ladle table in GB/T 16270. Product analysis, when ordered, follows GB/T 222. Grade E is tighter on phosphorus and sulfur than grade C, because the impact test is at −40°C. Mills add Nb, V, Ti or Al for grain refinement, and may add Cr, Ni, Mo or B by thickness. Boron is common on 690 MPa heats. Nickel helps the cold impact. The certificate shows the elements actually used.

Heat Analysis and Product Analysis — GB/T 16270 Q690E

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 Q690E mechanical properties, Q690E yield strength, GB/T 16270 Q690E tensile and Q690E impact −40°C.

Tensile and impact — GB/T 16270 Q690E

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 27 J to 34 J at −40°C, depending on the ordered edition and thickness. Write the energy on the purchase order if the owner wants a number above the book minimum.

Yield steps down with thickness. A 690 MPa name on 20 mm plate is not the minimum on a 120 mm flange. 690 MPa is 100 ksi. ASTM A514 uses the same yield number, but it does not carry this −40°C quality letter. 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 Q690E. What buyers compare is a 690 MPa QT plate tested at −40°C.

In the United States the nearest name is ASTM A514/A514M, including A514 Grade Q. A514 is 100 ksi / 690 MPa minimum yield up to 65 mm. That matches the Q690E thin-plate number. It does not match the −40°C quality letter. A572 Gr.65 is only 65 ksi. ASTM A656 Grade 80 is 80 ksi. SHH STEEL will not stamp A514 on a Q690E certificate unless the purchase order names both books and both tables are met.

The usual European pair is S690QL. S690Q is warmer. S690QL1 is colder. In Japan, SM570 is a welded structural grade and is well below this yield.

Buyers pick Q690E when a welded frame, boom or chassis wants 690 MPa yield, QT delivery and impact at −40°C. Search phrases such as Q690E steel plate, GB/T 16270 Q690E and Q690E QT plate all point here.

It is the wrong plate for a 0°C file that can use Q690C. It is the wrong plate for a −20°C file that can use Q690D. It is the wrong plate for a −60°C arctic file. That work is Q690F. It is the wrong plate for a US file that actually names ASTM A514 and a named grade letter. That work stays on A514 unless the order also accepts GB/T 16270. It is the wrong plate for a pressure vessel. That work sits on ASTM A516 or pressure vessel steel plates.

SHH STEEL supplies this plate when the drawing names GB/T 16270 and quality grade E at 690 MPa.

Q690E is weldable QT carbon plate. The plate has already been quenched and tempered, and the joint must keep −40°C toughness. Many heats use boron. A procedure written for S355JR is not a Q690E procedure.

Typical consumables are matching 690 MPa low-hydrogen electrodes or wires, qualified on a QT 690 MPa family with a −40°C impact coupon. E7018-class electrodes are under-matched if the joint must develop full plate strength. A procedure written for S690QL is the usual starting point. An A514 procedure is a useful strength reference, not a finished WPS for the E letter.

Preheat follows thickness, hydrogen and the approved WPS. Interpass temperature should stay below the mill temper range, or local yield and the −40°C result 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 Q690E is quenched and tempered. Austenitize typically in the 880–930°C range, quench, then temper in the window that holds 690 MPa yield and the −40°C impact. Exact temperatures stay on the mill process sheet.

Do not order Q690E as as-rolled or TMCP unless the contract leaves GB/T 16270. ASTM A514 is not a delivery instruction for this page unless dual mark is written. Stress relief after fabrication, if used, must stay below the original temper temperature.

The certificate lists GB/T 16270 Q690E, heat number, heat analysis, product analysis when ordered, tensile by thickness band, and −40°C impact. Certificates may be EN 10204 3.1 or EN 10204 3.2. Dual marking to S690QL is available only when both books are fully met.

Usual supply range from SHH STEEL for Q690E QT carbon steel plate:

• Thickness: commonly 8 mm – 80 mm, heavier plate to 100 mm by enquiry
• Width: 1500 mm – 3500 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 Q690E follow GB/T 709 unless the purchase order names another table.

Typical thickness tolerance idea for Q690E QT plate

Width on 1500–3500 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 Q690E unless the order says so.

Q690E already defines 690 MPa yield, QT delivery and −40°C impact. Extra items still have to be written on the purchase order.

Book name. Write GB/T 16270 Q690E. Do not write only Q690E.

Impact. Grade E is −40°C. Write a higher energy if the owner requires it.

US comparison. Write A514 only if dual mark is required and both tables are met.

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, Q690E, thickness and mill logo.

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

Q690E is the plate for a 690 MPa QT file tested at −40°C. It is the wrong plate for a painted warehouse that can use S355JR. It is the wrong plate for an 800 MPa member.

SHH STEEL sources Q690E 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. Heavier plate is confirmed before order.

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 Q690E that means mill-direct QT price, not a multi-layer stockist mark-up. We buy from mills that already run the 690 MPa quench-and-temper route, so the heat carries the −40°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 Q690E, keep the QT route, and do not ship Q690D or a silent A514 stamp as Q690E. We will not change E to D to save a cold test, and we will not treat Q690E as S355. If the drawing needs −60°C, we will move the inquiry to Q690F and keep the price on the right grade.

Q690E QT carbon steel plate to GB/T 16270 is 690 MPa quenched-and-tempered structural plate with impact at −40°C. The nearest US comparison is ASTM A514, which matches the 100 ksi yield but is not a silent substitute. Whether the inquiry says Q690E, GB/T 16270 Q690E, Q690E QT plate or Q690E carbon steel plate, SHH STEEL as a global steel mill sourcing partner supplies plate with Q690E chemistry, heat and product analysis as ordered, GB/T 709 tolerances and EN 10204 3.1 or 3.2 certification.

SHH STEEL supplies Q690E 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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