GB/T 713 Q370R Steel Plate | Q370R Pressure Vessel Plate

GB/T 713 Q370R, also written Q370 R, GB/T 713.2 Q370R, 15MnNbR and Q370R steel plate, is a Chinese fine-grain boiler and pressure-vessel plate. Current product rules sit in GB/T 713.2-2023. Buyers still search GB/T 713. Yield is 370 MPa at 6–16 mm. Tensile in that band is 530–630 MPa. Delivery is normalizing or normalizing plus tempering. Impact is commonly −20 °C. 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 “Q370 vessel plate” is incomplete. Write GB/T 713 Q370R or GB/T 713.2 Q370R. Do not ship Q345R against a Q370R drawing. Do not ship Q420R against a Q370R drawing. Do not ship SA516 Gr.70 and stamp Q370R because tensile looks close. Q370R uses Nb, normalize delivery and −20 °C impact. That is not the Q345R 0 °C package.

Old name 15MnNbR still appears on drawings. If the drawing says 15MnNbR, confirm whether the buyer accepts Q370R marking or needs both names on the certificate.

This page is not JIS G3106 SM490. It is not DIN 17100 St52-3. It is not QT alloy under ASME SA387. It is not low-temperature 16MnDR under GB/T 713.3.

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

This plate sits in pressure vessel steel plates and carbon steel plates. ASME comparisons belong on ASME SA516 and ASME SA537, not as automatic substitutes.

GB/T 713 Q370R / Q370 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 Q370R

For thickness greater than 60 mm, carbon may rise to 0.20% heat analysis when the standard allowance is used. Nb is required on Q370R. That is the main chemistry difference versus Q345R. Nb + V + Ti together shall not exceed 0.150%. Do not treat Q345R chemistry as Q370R. SHH STEEL reports heat analysis on every certificate and product analysis when the order names it.

Yield starts at 370 MPa at 6–16 mm and falls as thickness rises.

Tensile and Yield — GB/T 713 Q370R (typical published bands)

Impact for Q370R is commonly −20 °C, 47 J minimum. That is colder than the Q345R 0 °C package. Write the test temperature if the destination file wants −40 °C. Do not quote 370 MPa yield on an 80 mm plate. Do not treat 530–630 MPa tensile as permission to stamp SA516 Gr.70 or SA537 Cl.1 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 Q370R.

GB/T 713 Q370R / Q370 R is selected for boilers, drums, towers, heat-exchanger shells and other pressure equipment that name the Chinese vessel book at the 370 MPa normalize step with −20 °C impact. It sits between Q345R and Q420R. 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 SA537 Cl.1, SA516 Gr.70 or SA662 Gr.C.

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.

Q370R is killed fine-grain C-Mn-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 530–630 MPa tensile band, not a SA387 Gr.12 Cl.2 Cr-Mo procedure and not a QT procedure from SA517 Gr.F. Preheat follows thickness and hydrogen control. The fabricator owns the WPS. SHH STEEL can share mill heat data for that review.

Usual delivery from SHH STEEL is normalized or normalized-and-tempered GB/T 713 Q370R. 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 Q370R or GB/T 713.2 Q370R; 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. Certificates may be EN 10204 3.1 or EN 10204 3.2. Dual marking to P355NH or SA537 Cl.1 is available only when both books are met.

Usual supply range from SHH STEEL for Q370R pressure vessel plate:

• Thickness: commonly 6 mm – 100 mm. Confirm any request above 100 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 Q370R / Q370 R orders add extras. SHH STEEL does not assume them.

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

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

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. Ordinary Q370R is not automatically HIC plate.

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.1, 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 Q370R:

• 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 Q370R / Q370 R that means mill pricing, Q370R chemistry reported as heat analysis and as product analysis when ordered, recorded normalize, tensile results to the correct thickness column, 370 MPa yield in the thin band, −20 °C impact, 3.1 as standard and 3.2 when specified.

We keep the grade on the order. Q370R is not Q345R. Q370R is not Q420R. Q370R is not structural Q355B. Q370R is not 16MnDR. Q370R is not SA516 Gr.70 unless both books are met. Q370R is not SA387 Gr.22 Cl.2. If the drawing names 0 °C Q345R, we will not ship Q370R without confirming the impact package.

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

GB/T 713 Q370R Steel Plate, also searched as Q370 R, GB/T 713.2 Q370R and 15MnNbR, is Chinese fine-grain boiler and pressure-vessel plate at the 370 MPa yield step, 530–630 MPa tensile in the thin band, normalize delivery and −20 °C impact. Whether the inquiry says GB/T 713 Q370R, Q370 R or Q370R Pressure Vessel Plate, SHH STEEL as a global steel mill sourcing partner and steel manufacturer & exporter (mill-direct, China origin) supplies plate with Q370R chemistry, heat and product analysis when ordered, recorded normalize, and EN 10204 3.1 or 3.2 certification.

SHH STEEL supplies GB/T 713 Q370R / Q370R 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 P355NH marking when eligible, impact testing, 3.2 inspection or a quotation.

GB/T 713 Q370R Steel Plate, Q370 R, GB/T 713.2 Q370R, 15MnNbR, Q370R pressure vessel plate, Q370R supplier, global steel mill sourcing partner SHH STEEL