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GB/T 713 Q370R steel plate, also written as Q370R pressure vessel steel plate, GB713 Q370R, Q370R boiler steel plate, is a higher-strength C-Mn-Nb vessel plate under GB/T 713 / GB/T 713.2, typically supplied normalized, with about 370 MPa minimum yield in the thin band, tensile around 530-630 MPa and Charpy V-notch at -20°C. Gangsteel (HENAN GANG IRON AND STEEL) produces and exports Q370R plates cut to size with MTC for higher-stress vessels and boilers.
Data source: Per GB/T 713 / GB/T 713.2-2023 (Steel plate, sheet and strip for pressure equipments — Part 2: Non-alloy and alloy steel with specified temperature properties; buyers still search “GB/T 713”). Official mill/certificate grade is Q370R. Verify the contracted edition and purchase-order supplements before ordering.
| Element | C | Si | Mn | P | S | Nb |
|---|---|---|---|---|---|---|
| Q370R, % | 0.18 max | 0.55 max | 1.20-1.60 | 0.025 max | 0.015 max | 0.015-0.050 |
| Element | Cu | Ni | Cr | Mo | V | Ti |
|---|---|---|---|---|---|---|
| Q370R, % | 0.30 max | 0.30 max | 0.30 max | 0.08 max | per edition | per edition |
Per GB/T 713.2 heat analysis. Nb is intentional microalloying for grain refinement after normalizing.
| Thickness | Yield ReL, min | Tensile Rm | Elongation A, min | Impact KV2 |
|---|---|---|---|---|
| 10–16 mm | 370 MPa | 530-630 MPa | 20% | -20°C, ≥34 J |
| >16–36 mm | 360 MPa | 530-630 MPa | 20% | -20°C, ≥34 J |
| >36–60 mm | 340 MPa | 520-620 MPa | 20% | -20°C, ≥34 J |
| >60–100 mm | 330 MPa | 510-610 MPa | 20% | -20°C, ≥34 J |
Per GB/T 713.2. Normalized delivery. Confirm thickness coverage on the order.
Normalized (N). Killed, fine-grain with Nb. Tensile, Charpy at -20°C and bend. Optional UT, Z-test, PWHT simulation and 3.1/3.2 MTC.
Commonly 10–60 mm (confirm thicker coverage with mill), width 1500-4000 mm, length 6000-18000 mm.
Higher-stress pressure vessels and boilers needing -20°C toughness under GB/T 713.
| Standard | Comparable grade (approximate) |
|---|---|
| GB/T 713 | Q370R |
| ASTM/ASME | ASTM A516 / A516 Grade 70 / SA516 Gr.70 (approx.; dual cert by agreement) |
| EN 10028-2 | P265GH / P355GH family (approx.) |
| Related GB/T 713 | Q245R | Q345R | Q420R | Q460R | 18MnMoNbR |
Equivalents are engineering references only. Dual certification requires the stricter combined limits on the PO and MTC.
It is a C-Mn-Nb boiler and pressure vessel steel under GB/T 713 / GB/T 713.2. a higher-strength C-Mn-Nb vessel plate under GB/T 713 / GB/T 713.2, typically supplied normalized, with about 370 MPa minimum yield in the thin band, tensile around 530-630 MPa and Charpy V-notch at -20°C. Gangsteel lists the official mill/certificate grade as Q370R. See the full GB/T 713 Q370R page for chemistry and mechanical tables.
About 370 MPa min in the thin band, reducing with thickness. Typical tensile bands are shown in the mechanical properties table on this page; confirm the contracted GB/T 713.2 edition before design.
-20°C (not 0°C like default Q345R), typically ≥34 J. Always state the required Charpy temperature and energy on the purchase order.
Normalized (N). Killed, fine-grain with Nb. Tensile, Charpy at -20°C and bend. Optional UT, Z-test, PWHT simulation and 3.1/3.2 MTC.
All sit in the GB/T 713.2 non-alloy / microalloy vessel family. Sister carbon grades: Q245R / Q345R / Q420R / Q460R. Hub: GB/T 713 Steel Plate.
No. They are often compared for design but chemistry, impact and delivery rules differ. See ASTM A516 and A516 Grade 70 / SA516 Gr.70. Dual certification needs the stricter combined limits on the PO and MTC.
EN 10204 3.1 as standard; 3.2 with third-party inspection when ordered. MTC lists heat analysis, mechanical tests, delivery condition and any optional UT / Z / HIC / elevated-temperature results.
Commonly 10–60 mm (confirm thicker coverage with mill), width 1500-4000 mm, length 6000-18000 mm. Browse the GB/T 713 hub for the full grade list.
GB/T 713 Steel Plate | Q345R | Q245R | 15CrMoR | ASTM A516 | ASTM A387 | ASTM A537 | Pressure Vessel Steel Plate | Boiler Steel Plate
