SKD 11 Cold Work Tool Steel
A:Specification
| Cold Work Steels | 42CrMo圆 | ∮16-130 | 3000-5800 | Hot Rolled |
| ∮140-160 | 3000-5800 | |||
| ∮170-240 | 3000-5800 | |||
| ∮260-330 | 3000-5800 | Forging 、Annealed | ||
| ∮340-440 | 3000-5800 | |||
| ∮450-550 | 3000-5800 | |||
| ∮>550 | 3000-5800 | |||
| ∮75-130 | 3000-5800 |
B: Performance Table
|
General INFORMATION |
Chromium molybdenum high tensile steel with yield strength of 550N/mm2. Chromium renders steel oil hardenable and increase hardenability. Weldability suffers increasing chromium content. High temperature strength and high pressure hydrogenation properties are promoted by chromium and molybdenum. Molybdenum significantly reduces temper brittleness. |
| Comparable Standards |
AISI/SAE DIN W.N r. AFNOR BS SIAU |
| 4140 42CrMo4 1.7225 42CD4 708A42 UM8 | |
| Chemical Analysis (%) |
C Mn Si Ni Mo P S |
| 0.38-0.45 0.62-0.90 0.15-0.40 0.90-1.20 - - - |
| Hot work and heat treatment temperatures | ||||||
| Critical Points |
Forging | Normalization | Subcritical Annealing |
Isothermal Annealing |
Hardening | Tampering |
| Ac1 745 Ac3 790 Ms 300 |
110~900 | 860~880 | 680~720 | 83~900 ↓ 670×3h |
830~860 Oil | 550~650 |
Heat Treatment
| Heat Treatment（℃） | Mechanical properties | |||||||||
| Quenched | Tempered | Tensile str. ( N/mm2) | Yield point(N/mm2) | Elongation (%) |
Contraction (%) |
Impact (J/cm2) |
Hardness (NB) |
|||
| 850 | 560 | 1080 | 930 | 12 | 45 | 63 | 217 | |||
| Physical Properties | ||||||||||
| Thermal Conductivity (20℃) Wm-1 .ok-1 |
Typical Thermal Coefficient10-6 ok-1 |
Specific Heat(20℃) J.kg-1. OK-1 |
Density(20℃) | |||||||
Tempering Curve (only for reference):
