14MnNbq steel plate implementation standard: GB/T714
14MnNbq steel heat treatment (delivery status): hot rolling, controlled rolling, normalizing.
14MnNbq bridge structural steel plate belongs to low alloy high strength steel. 14MnNbq plate is a special steel plate for the manufacture of bridge structural parts. The thickness of the bridge steel plate is 6-60mm. It is used to make highway bridges and railway bridges including sea-crossing bridges with riveted and bolted structures.
14MnNbq bridge steel plate chemical element, chemical composition:
| C | Si | Mn | P | S | Ni | Cr | Cu | Nb | Ceq Max |
| 0.11-0.17 | ≤0.5 | 1.2-1.6 | ≤0.02 | ≤0.010 | ≤0.3 | ≤0.3 | ≤0.3 | 0.015-0.035 | ≤0.425 |
Composition Notes: Cr, Ni, and Cu are residual elements. Ceq= C+Mn/6+Si/24+Ni/40+Cr/5+Mo/4+V/14
14MnNbq steel plate mechanical properties:
| Delivery Status | Thickness | Mechanical properties | |||
| Hot rolling, normalizing | 6-16mm | ReL(MPa) | ≥370 | ||
| Rm(MPa) | 530-685 | ||||
| A5(%) | ≥20 | ||||
| Impact temperature | -40 | ||||
| Akv(J) | ≥100 | Longitudinal; 10% longitudinal strain aging Akvs ≥ 100J | |||
| Bending diameter | 2a | ||||
| Bending angle | 180 | ||||
| Remark | Transverse sampling for tensile test | ||||
| 17-25mm | ReL(MPa) | ≥355 | |||
| Rm(MPa) | 510-665 | ||||
| A5(%) | ≥19 | ||||
| Impact temperature | -40 | ||||
| Akv(J) | ≥100 | Longitudinal; 10% longitudinal strain aging Akvs ≥ 100J | |||
| Bending diameter | 3a | ||||
| Bending angle | 180 | ||||
| Remark | Transverse sampling for tensile test | ||||
| Normalizing | 26-40mm | ReL(MPa) | ≥350 | ||
| Rm(MPa) | 500-645 | ||||
| A5(%) | ≥19 | ||||
| Impact temperature | -40 | ||||
| Akv(J) | ≥120 | Longitudinal; 10% longitudinal strain aging Akvs≥120J | |||
| Bending diameter | 3a | ||||
| Bending angle | 180 | ||||
| Remark | Transverse sampling for tensile test | ||||
14MnNbq steel plate application:
14MnNbq bridge steel is used for road bridges and railway bridges (including sea-crossing bridges) for the production of riveted and bolted structures. It is used for the construction of long-span bridges, especially for the construction of long-span bolt-welded or all-welded railway bridges.
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