1.2738 MOLD STEEL
Standard: Equivalent to China 3Cr2NiMnMo, Sweden (ASSAB) 718, and the United States P20+Ni
1.2311 mold steel has good comprehensive mechanical properties, high hardenability, and good polishing performance. It can achieve relatively uniform hardness for large-section steel (with a maximum pre hardening thickness of 700mm), which not only ensures the performance of the mold, but also reduces the production cycle and cost of the mold.
Main application: mainly used for molds with high surface finish requirements (such as home appliance shells and automotive interiors)
Ornaments, etc.), this steel grade is suitable for making large and medium-sized plastic molds.
Chemical composition
| SIZE (thickness) |
C |
Si |
Mn |
P |
S |
Cr |
Mo |
Cu |
Ni |
| Thickness≤800 |
0.30-0.40 |
0.40-0.60 |
1.30- 1.60 |
≤0.020 |
≤0.010 |
1.70-2.00 |
0. 25-0.30 |
≤0.20 |
0.90-1.15 |
| Thickness≥800 |
0.30-0.40 |
0.40-0.60 |
1.30- 1.60 |
≤0.020 |
≤0.010 |
1.70-2.00 |
0.25-0.40 |
≤0.20 |
1.0-1.15 |
Physical properties: The physical properties of 1.2738 steel are shown in the table below, with a density of 7.8Kg/m3, an elastic modulus (at room temperature) of E: 205000MPa, and a linear expansion coefficient (within the range of 20-200 ℃) of 12.7x10-6.
1.2311 critical temperature of steel
| Critical point |
AC1 |
AC3 |
Ar1 |
Ar3 |
Ms |
Mf |
| Temperature (℃) approximate value |
725 |
810 |
- |
- |
285 |
100 |
1.2738 thermal conductivity
| Temperature/℃ |
20 |
200 |
| Thermal conductivity λ/W (m · K) - 1 |
29.0 |
29.5 |
Supply hardness: pre hardened (quenched and tempered): HRC30-36
Product Tags:
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1.2738 HMS2738 Plastic Mold Steel 3Cr2NiMnMo ASSAB-718 P20+N 400mm Images
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