Plastic mold steel is a type of steel specifically used for manufacturing plastic molding dies, offering excellent properties to meet the high demands of plastic product production.
Excellent Machinability:
Plastic mold steel has good cutting performance and machinability, suitable for processing and forming complex molds.
Typically pre-hardened (e.g., P20, 718 steel grades) with moderate hardness (HB 280-340), facilitating machining and polishing.
High Surface Finish:
The mold surface requires a high degree of smoothness to ensure the appearance quality of plastic products. Plastic mold steel offers excellent polishing performance, achieving a mirror-like finish.
Suitable for producing high-precision, high-surface-quality plastic products, such as optical lenses and transparent components.
Good Wear Resistance and Corrosion Resistance:
Some plastic mold steels contain elements like chromium and nickel, providing good corrosion resistance, suitable for processing plastics with corrosive components.
Strong wear resistance allows it to withstand friction and wear during long-term injection molding, extending mold service life.
Uniform Hardness and Microstructure:
Plastic mold steel undergoes special smelting and heat treatment, resulting in uniform hardness and microstructure with minimal internal defects.
Uniform hardness distribution prevents cracking due to stress concentration during use.
Good Heat Treatment Performance:
Hardness and toughness can be adjusted through heat treatment processes like quenching and tempering to meet the needs of different molds.
Certain steel grades have excellent thermal fatigue resistance, suitable for injection molds for thermoplastic plastics.
Dimensional Stability:
Plastic mold steel exhibits low deformation rates during heat treatment and long-term use, ensuring mold dimensional accuracy.
Suitable for manufacturing large or precision molds, such as automotive parts and appliance housings.
Good Weldability:
Molds may require welding during processing or repair. Plastic mold steel offers good weldability, facilitating repairs and modifications.
The heat-affected zone after welding is small, with minimal risk of cracking.
