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GB/T 713 18MnMoNbR steel plate, also written as 18MnMoNbR pressure vessel steel plate, GB713 18MnMoNbR, 18MnMoNbR boiler plate, is a Mn-Mo-Nb alloy boiler and pressure vessel plate under GB/T 713 / GB/T 713.2, supplied normalized and tempered (temper typically ≥620°C), with about 400 MPa min yield in the mid-thickness band and tensile around 570-720 MPa. Gangsteel (HENAN GANG IRON AND STEEL) produces and exports 18MnMoNbR plates cut to size with MTC for thick-wall boilers and vessels.
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 18MnMoNbR. Verify the contracted edition and purchase-order supplements before ordering.
| Element | C | Si | Mn | P | S | Mo |
|---|---|---|---|---|---|---|
| 18MnMoNbR, % | 0.21 max | 0.15-0.50 | 1.20-1.60 | 0.020 max | 0.010 max | 0.45-0.65 |
| Element | Nb | Cu | Ni | Cr | — | — |
|---|---|---|---|---|---|---|
| 18MnMoNbR, % | 0.025-0.050 | 0.30 max | 0.30 max | 0.30 max | — | — |
Per GB/T 713.2 heat analysis. Mo+Nb give elevated-temperature strength for thick boiler drums and vessels.
| Thickness | Yield ReL, min | Tensile Rm | Elongation A, min | Impact KV2 |
|---|---|---|---|---|
| 30–60 mm | 400 MPa | 570-720 MPa | 17% | 0°C / per edition |
| >60–100 mm | 390 MPa | 570-720 MPa | 17% | per edition |
Per GB/T 713.2. N+T delivery; temper ≥620°C.
Normalized + tempered (temper ≥620°C). Optional simulated PWHT, UT, elevated-temperature tensile and 3.1/3.2 MTC.
Commonly about 30–120 mm (confirm mill max), width 1500-4000 mm, length 6000-18000 mm.
Thick-wall boiler drums, high-pressure vessels and equipment needing Mn-Mo-Nb elevated-temperature strength.
| Standard | Comparable grade (approximate) |
|---|---|
| GB/T 713 | 18MnMoNbR |
| ASTM/ASME | ASTM A387 / SA387 / A387 Grade 12 (approx. for Cr-Mo class) |
| EN 10028-2 | 13CrMo4-5 (approx. for 1Cr-Mo class) |
| Related GB/T 713 | Q245R | Q345R | Q370R | Q420R | Q460R |
Equivalents are engineering references only. Dual certification requires the stricter combined limits on the PO and MTC.
It is a Mn-Mo-Nb boiler and pressure vessel steel under GB/T 713 / GB/T 713.2. a Mn-Mo-Nb alloy boiler and pressure vessel plate under GB/T 713 / GB/T 713.2, supplied normalized and tempered (temper typically ≥620°C), with about 400 MPa min yield in the mid-thickness band and tensile around 570-720 MPa. Gangsteel lists the official mill/certificate grade as 18MnMoNbR. See the full GB/T 713 18MnMoNbR page for chemistry and mechanical tables.
About 400 MPa min at 30–60 mm; confirm thicker bands 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.
Per GB/T 713.2 edition table (commonly 0°C class unless ordered otherwise). Always state the required Charpy temperature and energy on the purchase order.
Normalized + tempered (temper ≥620°C). Optional simulated PWHT, UT, elevated-temperature tensile and 3.1/3.2 MTC.
18MnMoNbR is in the Mn-Mo-Nb alloy family under GB/T 713.2. Related alloy grades: 15CrMoR / 14Cr1MoR / 12Cr2Mo1R / 12Cr1MoVR / 12Cr2Mo1VR / 07Cr2AlMoR / 13MnNiMoR. Carbon workhorses remain Q345R / Q245R.
They are approximate engineering counterparts only. Compare with ASTM A387 / SA387 and EN 10028-2 13CrMo4-5. Dual certification requires the stricter combined limits.
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 30–120 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
