Minimum specified materials properties for E-type coupler and knuckle
| Mechanical propoerty | Value |
|---|---|
| Yield strength | 690 MPa |
| Tensile strength | 825 MPa |
| Elongation | 14% |
| Reduction in area | 30% |
| Impact energy (−40) | 3.50 kg.m |
| Hardness Grade E steel castings (except knuckle) | 241–311 HBW (Brinell hardness) |
| Hardness (knuckle) | 241–291 HBW (Brinell hardness) |
| Mechanical propoerty | Value |
|---|---|
| Yield strength | 690 MPa |
| Tensile strength | 825 MPa |
| Elongation | 14% |
| Reduction in area | 30% |
| Impact energy (−40) | 3.50 kg.m |
| Hardness Grade | 241–311 HBW (Brinell hardness) |
| Hardness (knuckle) | 241–291 HBW (Brinell hardness) |