Products
Grade
| Grade Table of Materials for Cold Heading Dies and Steel Ball Dies | ||||||||||
| Grade | Cobalt Content | WC | Hardness | Density | Transverse Rupture Strength | Impact Toughness | Elastic Modulus | Thermal Expansion Coefficient | Application Scope | |
| Co% | Grain Size | HRA | HV30 | g/cm³ | MPa | J/cm2 | GPa | 10-6/℃ | ||
| MD51B | 19 | Medium | 85 | 950 | 13.5 | 3100 | 7.2 | 400 | 6.7 | Used for necking dies with large deformation in heading process. |
| MD50A | 20 | Medium | 85.8 | 1020 | 13.4 | 3300 | 9.2 | 390 | 6.8 | Used for necking dies with small deformation in heading process. |
| MD60A | 20 | Coarse | 84 | 880 | 13.6 | 2900 | 7.6 | 390 | 6.8 | Used for heading straight rods, screws, upper dies of nuts, etc. |
| MD61B | 22 | Medium | 84 | 880 | 13.3 | 3000 | 9.6 | 360 | 7.1 | Used for heading high-hardness stainless steel. |
| MD62B | 22 | Medium | 83.5 | 840 | 13.3 | 2800 | 7.6 | 360 | 7.1 | Used for heading drywall screws and ordinary stainless steel. |
| MD65A | 25 | Medium | 84.1 | 890 | 12.9 | 3000 | 10.1 | 340 | 7.6 | Used for straight rod dies with high working load in heading process. |
| MD70A | 25 | Coarse | 82.5 | 780 | 13.1 | 2800 | 8 | 340 | 7.6 | Used for lower dies of nuts and dies with high working load in heading process. |
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