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
Established in 1993 as a township enterprise Cover an area of over 3 million square meters with staff of more than 5500. Vice President Company of CANSI (China Association of National Shipbuilding Industry) Six main products series (4.3 million tons) 1. Welding Materials 2. S... Established in 1993 as a township enterprise Cover an area of over 3 million square meters with staff of more than 5500. Vice President Company of CANSI (China Association of National Shipbuilding Industry) Six main products series (4.3 million tons) 1. Welding Materials 2. S...
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