Changshu Longteng Special Steel Co., Ltd.
| Payment Terms | L/C, T/T, |
| Supply Ability | 40000MT/MONTH |
| Delivery Time | 30 DAYS |
| Packaging Details | Seaworthy way of packing |
| Material | 3Cr2NiMnMo |
| Product Name | Plastic Mold Steel |
| Model | thickness＞400 |
| Size | 400mm |
| Application | For electrical enclosures, automotive interiors |
| Brand Name | LONGTENG |
| Model Number | thickness ＞ 400 |
| Place of Origin | CHINA |
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Product Specification
| Payment Terms | L/C, T/T, | Supply Ability | 40000MT/MONTH |
| Delivery Time | 30 DAYS | Packaging Details | Seaworthy way of packing |
| Material | 3Cr2NiMnMo | Product Name | Plastic Mold Steel |
| Model | thickness＞400 | Size | 400mm |
| Application | For electrical enclosures, automotive interiors | Brand Name | LONGTENG |
| Model Number | thickness ＞ 400 | Place of Origin | CHINA |
| High Light | Electrical Enclosures Plastic Mould Steel Material ，Melting Plastic Mold Steel 400mm | ||
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 |
Company Details
Business Type:
Manufacturer,Importer,Exporter
Year Established:
1993
Employee Number:
4500~5000
Ecer Certification：
Site Member
Jiangsu Longteng Special Steel Group Co., Ltd. is a well-known private enterprise in China's special steel industry. Founded in 1993, it is a deep processing enterprise of metal products integrating sintering, ironmaking, steelmaking, refining, continuous casting, rolling and metal product proce... Jiangsu Longteng Special Steel Group Co., Ltd. is a well-known private enterprise in China's special steel industry. Founded in 1993, it is a deep processing enterprise of metal products integrating sintering, ironmaking, steelmaking, refining, continuous casting, rolling and metal product proce...
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