what are differences among AAR-C,42CrMo4 and 42CrMo2?
How many types of materials are used to forge train wheels and axles?
what are differences among AAR-C,42CrMo4 and 42CrMo2?
| AAR C Material | 42CrMo4 | 42CrMo2 | |
| Standard | Complies with AAR (Association of American Railroads) standards AAR-M-201 and AAR-M-211 | Corresponding to German DIN standards Implements European standard EN 10083-3:2006, improved from AISI 4140 steel in the United States | Corresponding to China GB/T standards |
| Chemical Composition | Carbon (C): 0.15%-0.21% also contains elements like silicon (Si), manganese (Mn), chromium (Cr), molybdenum (Mo), etc. | Carbon (C): 0.38%-0.45%, Silicon (Si): ≤0.40%, Manganese (Mn): 0.60%-0.90%, Chromium (Cr): 0.90%-1.20%, Molybdenum (Mo): 0.15%-0.30% | Carbon (C): 0.38%-0.45%, Silicon (Si): 0.17%-0.37%, Manganese (Mn): 0.50%-0.80%, Chromium (Cr): 0.90%-1.20%, Molybdenum (Mo): 0.15%-0.25% |
| Mechanical Properties | Tensile strength: ≥620MPa, Yield strength: ≥415MPa, Elongation: ≥22% | Tensile strength: ≥1080MPa, Yield strength: ≥930MPa, Elongation: ≥12% | Tensile strength: ≥1080MPa, Yield strength: ≥930MPa, Elongation: ≥12% |
| Application Field | Mainly used for railroad components such as couplers,train wheels of railway freight cars | Widely used in machinery manufacturing, automotive manufacturing, aerospace, petrochemical and other fields, e.g., manufacturing gears, shafts, bolts, nuts,train wheels,etc. | Mainly used for manufacturing forgings with high strength requirements and large quenched-tempered sections, such as large gears for locomotive traction, supercharger drive gears, rear axles,train axles,etc. |