GB/T 713 Q420R Steel Plate | Q420R Pressure Vessel Plate

GB/T 713 Q420R, also written Q420 R, GB/T 713.2 Q420R and Q420R steel plate, is a Chinese high-strength boiler and pressure-vessel plate. Current product rules sit in GB/T 713.2-2023. Buyers still search GB/T 713. Yield is 420 MPa at 10–20 mm. Tensile in that band is 590–720 MPa. Delivery is normalizing. Impact is commonly −20 °C, 60 J. Nickel and niobium are part of the chemistry. SHH STEEL is a global steel mill sourcing partner and steel manufacturer & exporter (mill-direct, China origin) for this grade. Plate is produced to GB/T 713 / GB/T 713.2 and shipped to buyers in the USA, Mexico, South America, Europe, Middle East, Africa and Asia.

A purchase order that only says “Q420 vessel plate” is incomplete. Write GB/T 713 Q420R or GB/T 713.2 Q420R. Do not ship Q370R against a Q420R drawing. Do not ship Q460R against a Q420R drawing. Do not ship structural Q420B / Q420C against a vessel drawing. Do not ship SA516 Gr.70 and stamp Q420R because tensile looks close.

Q420R is often specified for mobile tanks, rail tanks and lighter high-strength shells that still stay inside the Chinese vessel book. GB/T 713.2 also added high-temperature proof-stress data for this grade. If the drawing needs those elevated-temperature values, write them on the order.

This page is not JIS G3106 SM570. It is not EN 10025-6 S460Q. It is not QT alloy under ASME SA387. It is not low-temperature Q420DR under GB/T 713.3.

Company scope: global steel mill sourcing partner – SHH STEEL.

This plate sits in pressure vessel steel plates and high strength low alloy plates. ASME comparisons belong on ASME SA612, ASME SA737 and ASME SA537, not as automatic substitutes.

GB/T 713 Q420R / Q420 R heat analysis follows GB/T 713.2 Table 1. Product analysis follows the permitted deviations in GB/T 713.1. Write “heat + product analysis” on the order if both are required.

Heat Analysis and Product Analysis — GB/T 713 Q420R

Nickel and niobium are required. That is the main chemistry difference versus Q370R. Do not treat Q370R chemistry as Q420R. Do not treat structural Q420B chemistry as Q420R. SHH STEEL reports heat analysis on every certificate and product analysis when the order names it. Carbon equivalent may be specified by agreement.

Yield starts at 420 MPa at 10–20 mm and falls as thickness rises.

Tensile and Yield — GB/T 713 Q420R (typical published bands)

Elongation is commonly 18% min. Impact is −20 °C, 60 J. GB/T 713.2 also lists elevated-temperature proof stress for Q420R. Write 100 °C / 150 °C or other design temperatures on the order if the vessel file needs them.

Do not quote 420 MPa yield on a 28 mm plate. Do not treat 590–720 MPa tensile as permission to stamp SA516 Gr.70, SA612 or SA737 Gr.C without checking yield, impact and PWHT.

These names are project-comparison grades. They are not automatic substitutes. Dual marking is possible only when chemistry, tensile, impact, delivery condition and all extras fit both named editions.

ASME SA515, ASME SA387 and ASME SA203 are not Q420R.

GB/T 713 Q420R / Q420 R is selected for boilers, mobile tanks, rail tanks, towers and other pressure equipment that name the Chinese vessel book at the 420 MPa normalize step with −20 °C impact. The extra nickel and niobium support that yield without jumping to QT Q460R. It is not automatically an ASME Section VIII plate. If the vessel is ASME, the drawing should name an ASME or ASTM grade such as SA612, SA737 Gr.C or SA537 Cl.1.

SHH STEEL supplies this plate to fabricators in the United States, Mexico, South America, Europe, the Middle East, Africa and Asia. It is not nickel low-temp plate like SA203 Gr.D or SA203 Gr.E. It is not QT Ni-Cr-Mo like SA543 Type B Cl.1. It is not Cr-Mo like SA387 Gr.22 Cl.2 or 15CrMoR. Stainless inquiries belong on ASME SA240 or ASTM A240.

Q420R is killed C-Mn-Ni-Nb vessel plate. Welding is production welding, and Code welding when the equipment is a vessel.

Qualify procedures to the applicable code. For ASME work that happens to use a dual-named plate, use ASME Section IX. Consumables should match the 590–720 MPa tensile band, not a SA387 Gr.12 Cl.2 Cr-Mo procedure and not a QT procedure from SA517 Gr.Q. Preheat follows thickness and hydrogen control. Carbon equivalent may be limited by agreement. The fabricator owns the WPS. SHH STEEL can share mill heat data for that review.

Usual delivery from SHH STEEL is normalized GB/T 713 Q420R. Normalizing plus tempering is used when the order names it. As-rolled shipment is not the default for this grade.

If the vessel will see PWHT, test coupons shall follow a simulated cycle when the order names it. This is not the QT route used on SA738 Gr.B or SA737 Gr.C. Special heat treatment, extra simulation or third-party hold points add time. Plan about two months when those extras are on the order.

The certificate lists GB/T 713 Q420R or GB/T 713.2 Q420R; heat number; heat analysis; product analysis when ordered; tensile results to the correct thickness column; normalize statement; impact at −20 °C or the named temperature; elevated-temperature proof stress when ordered. Certificates may be EN 10204 3.1 or EN 10204 3.2. Dual marking to P420NH or SA612 is available only when both books are met.

Usual supply range from SHH STEEL for Q420R pressure vessel plate:

• Thickness: commonly 10 mm – 30 mm in the published GB table. Confirm any request above 30 mm against mill capability
• Width: 1500 mm – 4000 mm
• Length: 3000 mm – 12000 mm
• Cut-to-length plates and nest sizes inside those limits

Ship plate inquiries belong on shipbuilding steel plates or BV Rules. Weathering plate belongs on EN 10025-5 or Corten A/B. TMCP fine-grain structural belongs on EN 10025-4. QT structural belongs on EN 10025-6. Ordinary structural belongs on EN 10025-2 or JIS G3106.

Dimensional limits follow GB/T 713.1 and the mill rolling standard named on the order. Do not apply ASTM A36/A36M structural tolerances to a Chinese vessel plate without writing them. UT to GB/T 2970, JB/T 4730, EN 10160 or ASTM A435 / A577 / A578 is added when the order names it.

Most export GB/T 713 Q420R / Q420 R orders add extras. SHH STEEL does not assume them.

Charpy details. Temperature, energy, location and orientation. GB default is commonly −20 °C / 60 J.

Product analysis. Add this when the destination file wants finished-plate chemistry.

Nitrogen limit. 0.020% max when written.

Elevated-temperature proof stress. 100 °C / 150 °C or the design temperature.

Simulated PWHT. When the equipment will be stress-relieved.

NDE. UT per the named method.

Z-direction. Z15 / Z25 / Z35 when the drawing names it.

HIC / NACE / SSC. Only when written.

Third-party. EN 10204 3.2, with inspectors arranged for US, Mexican, European, Middle East, Japanese or Korean documentation packages.

Stainless inquiries belong on stainless steel products, JIS G4305 or AISI stainless. Other vessel comparisons: SA203 Gr.B, SA302 Gr.C, A516 Grade 70, SA533 Type C Cl.2, SA517 Gr.P, SA738 Gr.C.

SHH STEEL is a global steel mill sourcing partner with mill partnerships in China. We supply ASTM, ASME, EN, DIN, JIS and GB steel to buyers outside a single region. Origin is mill-direct, China origin.

SHH STEEL has supplied steel plates to:

• North America: USA, Mexico
• South America: Argentina, Peru and other South American ports
• Central America: El Salvador
• Europe: Spain, Netherlands, Germany and surrounding ports
• Middle East: UAE, Saudi Arabia and nearby Gulf ports
• Africa: South Africa
• South / Southeast Asia: India, Thailand, Singapore, Vietnam, Philippines
• East Asia: Japan, Korea

Typical trade terms: FOB Shanghai, CIF Houston, CIF Rotterdam, CIF Jebel Ali, plus Manzanillo, Callao, Buenos Aires, Barcelona, Durban, Laem Chabang, Ho Chi Minh, Manila, Mumbai, Yokohama and Busan.

Typical lead time for GB/T 713 Q420R:

• Ex-stock: about 5–7 days
• Mill rolling, standard normalize: about 45 days
• N+T extras, simulated PWHT, 3.2 or extra NDE: about 2 months

Documents travel with the cargo: mill certificate, packing list, commercial invoice, bill of lading, and EN 10204 3.1 or 3.2 as ordered. Third-party inspection can be arranged before loading. Packing is seaworthy, with edge protection and marking in English as specified on the order.

SHH STEEL is a global steel mill sourcing partner and steel manufacturer & exporter (mill-direct, China origin). We supply ASTM / ASME / EN / DIN / JIS / GB steel to the USA, Mexico, South America, Europe, the Middle East, Africa and Asia. On GB/T 713 Q420R / Q420 R that means mill pricing, Q420R chemistry reported as heat analysis and as product analysis when ordered, recorded normalize, tensile results to the correct thickness column, 420 MPa yield in the thin band, −20 °C / 60 J impact, 3.1 as standard and 3.2 when specified.

We keep the grade on the order. Q420R is not Q370R. Q420R is not Q460R. Q420R is not structural Q420B. Q420R is not Q420DR. Q420R is not SA516 Gr.70 unless both books are met. Q420R is not SA387 Gr.22 Cl.2. If the drawing names 370 MPa, we will not ship Q420R and call it close.

Company scope: global steel mill sourcing partner – SHH STEEL.

GB/T 713 Q420R Steel Plate, also searched as Q420 R and GB/T 713.2 Q420R, is Chinese high-strength boiler and pressure-vessel plate at the 420 MPa yield step, 590–720 MPa tensile in the thin band, normalize delivery and −20 °C / 60 J impact. Whether the inquiry says GB/T 713 Q420R, Q420 R or Q420R Pressure Vessel Plate, SHH STEEL as a global steel mill sourcing partner and steel manufacturer & exporter (mill-direct, China origin) supplies plate with Q420R chemistry, heat and product analysis when ordered, recorded normalize, and EN 10204 3.1 or 3.2 certification.

SHH STEEL supplies GB/T 713 Q420R / Q420R Pressure Vessel Plate to the USA, Mexico, South America, Europe, the Middle East, Africa and Asia for work that actually names this grade. FOB Shanghai / CIF Houston / Rotterdam / Jebel Ali.

Contact SHH STEEL for mill rolling, stock inquiry, normalize, dual P420NH or SA612 marking when eligible, impact testing, 3.2 inspection or a quotation.

GB/T 713 Q420R Steel Plate, Q420 R, GB/T 713.2 Q420R, Q420R pressure vessel plate, Q420R supplier, global steel mill sourcing partner SHH STEEL