Melting Method Plastic Mold Steel HMS2738 1.2738 718 EF+LF+VD 400mm
Brand Name:LONGTENG
Model Number:thickness ＞ 400
Minimum Order Quantity:25MT
Delivery Time:30 DAYS
Payment Terms:L/C, T/T,
Place of Origin:CHINA
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No.118 Hualian Road,Tongang Industrial park,Meili Town,Changshu,Jiangsu,China
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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
A Heat treatment
Heat treatment after forging (normalizing+tempering)
| Normalizing heating temperature℃ | Normalized cooling method | tempering temperature/℃ | Tempering cooling method | Notes |
| 840-890 | Air cooling/wind cooling | 650-700 | wind cooling | Properly increase the normalizing heating rate (refine grain size) |
B Quenching and tempering heat treatment (quenching+high-temperature tempering)
| Normalizing heating temperature℃ | Normalized cooling method | tempering temperature/℃ | Tempering cooling method | Notes |
| 840-880 | Water oil dual liquid quenching | 550-610 | Air cooling/furnace cooling | Properly control the final cooling temperature and tempering time into the furnace |
Melting Method Plastic Mold Steel HMS2738 1.2738 718 EF+LF+VD 400mm
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