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GB/T 713 Q420R steel plate, also written as Q420R pressure vessel steel plate, GB713 Q420R, Q420R high-strength vessel plate, is a higher-strength low-alloy pressure vessel plate under GB/T 713 / GB/T 713.2 in the 420 MPa yield class, typically normalized fine-grain delivery. Gangsteel (HENAN GANG IRON AND STEEL) produces and exports Q420R plates cut to size with MTC for high-strength vessels and tanks.
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 Q420R. Verify the contracted edition and purchase-order supplements before ordering.
| Element | C | Si | Mn | P | S | Nb/V/Ti |
|---|---|---|---|---|---|---|
| Q420R, % | 0.20 max | 0.55 max | 1.20-1.70 | 0.025 max | 0.015 max | microalloy |
| Element | Cu | Ni | Cr | Mo | N | — |
|---|---|---|---|---|---|---|
| Q420R, % | 0.30 max | 0.50 max | 0.30 max | 0.20 max | ≤0.020 on request | — |
Per GB/T 713.2 heat analysis. Microalloying supports the 420 MPa strength class after normalizing.
| Thickness | Yield ReL, min | Tensile Rm | Elongation A, min | Impact KV2 |
|---|---|---|---|---|
| 10–20 mm | 420 MPa | 590-720 MPa | 18% | 0°C / -20°C per order |
| >20–30 mm | 400 MPa | 570-700 MPa | 18% | per order |
Per GB/T 713.2. Confirm full thickness table and impact temperature on the PO.
Normalized or equivalent fine-grain delivery. Optional elevated-temperature tensile, UT, Z-test and 3.1/3.2 MTC.
Commonly about 10–60 mm (confirm mill max), width 1500-4000 mm, length 6000-18000 mm.
High-strength boilers, pressure vessels, mobile tanks where the 420 MPa yield class reduces wall thickness.
| Standard | Comparable grade (approximate) |
|---|---|
| GB/T 713 | Q420R |
| 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 | Q370R | Q460R | 18MnMoNbR |
Equivalents are engineering references only. Dual certification requires the stricter combined limits on the PO and MTC.
It is a HSLA boiler and pressure vessel steel under GB/T 713 / GB/T 713.2. a higher-strength low-alloy pressure vessel plate under GB/T 713 / GB/T 713.2 in the 420 MPa yield class, typically normalized fine-grain delivery. Gangsteel lists the official mill/certificate grade as Q420R. See the full GB/T 713 Q420R page for chemistry and mechanical tables.
About 420 MPa min in the thin band; confirm thicker-band reductions on the edition table. Typical tensile bands are shown in the mechanical properties table on this page; confirm the contracted GB/T 713.2 edition before design.
As ordered (commonly 0°C or -20°C under GB/T 713.2 supplements). Always state the required Charpy temperature and energy on the purchase order.
Normalized or equivalent fine-grain delivery. Optional elevated-temperature tensile, UT, Z-test and 3.1/3.2 MTC.
All sit in the GB/T 713.2 non-alloy / microalloy vessel family. Sister carbon grades: Q245R / Q345R / Q370R / 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 about 10–60 mm (confirm mill max), 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
