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Technical standard for SM490 steel plate: JIS G3106.
Heat treatment of SM490 steel plate: hot rolling, normalizing, quenching + tempering or tempering.
Mechanical properties, yield and tensile strength of SM490 steel plate:
| Grade | Yield point or yield strength,N/m㎡ | Tensile strength | ||||||
| Thickness mm | Thickness mm | |||||||
| ≤16 | 16<t≤40 | 40<t≤75 | 75<t≤100 | 100<t≤160 | 100<t≤200 | ≤100 | 100<t≤200 | |
| SM490A | ≥325 | ≥315 | ≥295 | ≥295 | ≥285 | ≥275 | 490-610 | 490-610 |
| SM490B | ≥325 | ≥315 | ≥295 | ≥295 | ≥285 | ≥275 | 490-610 | 490-610 |
| SM490C | ≥325 | ≥315 | ≥295 | ≥295 | - | - | 490-610 | 490-610 |
Melting analysis of chemical composition of SM490 steel plate:
| Grade | Thickness mm | C | Si | Mn | P | S |
| SM490A | t≤50mm | ≤0.20 | ≤0.55 | ≤1.65 | ≤0.035 | ≤0.035 |
| 50<t≤200mm | ≤0.22 | |||||
| SM490B | t≤50mm | ≤0.18 | ≤0.55 | ≤1.65 | ≤0.035 | ≤0.035 |
| 50<t≤200mm | ≤0.20 | |||||
| SM490C | t≤100mm | ≤0.18 | ≤0.55 | ≤1.65 | ≤0.035 | ≤0.035 |
SM490 is rolled steel for welded structure. S represents steel and M represents welding. 400 is also the lower limit tensile strength of 400MPa and impact at 0℃. SM490 is divided into three levels: SM490A, SM490B and SM490C. B is the grade of SM490 steel plate and impact at 20℃. C is the grade of steel plate. SM490 is a welded structural steel, which is suitable for structural parts requiring excellent welding performance such as buildings, bridges, ships, vehicles and construction machinery.
