GB/T 11251 alloy steel is one of the common hot-rolled alloy structural steel plates. GB/T 11251 Hot rolled plate has high strength and wear resistance, high hardenability, moderate cold deformation plasticity, good cutting performance and good welding performance. During the heat treatment, the toughness of the steel decreases less. GB/T 11251 alloy steel can still maintain high toughness under water cooling conditions, but it has a tendency of overheating sensitivity, white spot sensitivity and temper brittleness.
Product Parameters
Product Name | GB/T11251 1345 Alloy Structural SteelsPlate |
Production process | hot rolling,cold rolling |
Material Standards | AISI,ASTM,ASME,DIN,BS,EN,ISO,JIS,GOST,SAE etc. |
Width | 100mm-3000mm |
Length | 1m-12m,or customized size |
Thickness | 0.1mm-400mm |
Delivery Conditions | rolling,Annealing,Quenching,Tempered or standard |
Surface process | Ordinary,Wire drawing,Laminated film |
chemical composition
Brand | C | Si | Mn | B |
45Mn2 | 0.42~0.49 | 0.17~0.37 | 1.40~1.80 | - |
27SiMn | 0.24~0.32 | 1.10~1.40 | 1.10~1.40 | - |
40B | 0.37~0.44 | 0.17~0.37 | 0.60~0.90 | 0.0005~0.0035 |
45B | 0.42~0.49 | 0.17~0.37 | 0.60~0.90 | 0.0005~0.0035 |
50B | 0.47~0.55 | 0.17~0.37 | 0.60~0.90 | 0.0005~0.0035 |
Mechanical properties
Brand | Yield strength MPa min. | Elongationmin.% |
45Mn2 | 600 | 13 |
27SiMn | 550 | 18 |
40B | 500 | 20 |
45B | 550 | 18 |
50B | 550 | 16 |
Scope of application
GB/T 11251 alloy steel plates are widely used in various applications in bearings/gears of rotating machinery. Typical applications such as valve bodies, pumps and fittings, wheels, bolts, studs, gears, high loads of internal combustion engines. Electric locomotives, machine tools, tractors, steel rolling equipment, boring machines, railway vehicles and mining machinery drive shafts on steel balls, rollers and bushings, etc.
Equivalent Material
China | United States | Germany | Japan | France |
45Mn2 | 1345 | 46Mn7 | SMn3 | 45M5 |
27SiMn | - | 27MnSi5 | - | |
40B | 14B35 | 35B2 | - | - |
45B | 50B46H | 45B2 | - | - |
50B | 14B50 | - | - | - |
