Molds that operate in a chemically corrosive environment must be corrosion-resistant, and must have good hardness, strength, and wear resistance. The corresponding material is usually martensitic stainless steel. The following is based on the hardness requirements. Material application selection of martensitic stainless steel in molds.

Medium carbon high chromium corrosion resistant martensitic stainless steel

The hardness of this type of martensitic stainless steel is around 50-55HRC. The typical model is 4Cr13, which is a medium-carbon martensitic stainless steel. After heat treatment, it has good hardness and wear resistance, and is also resistant to atmospheric and water vapor corrosion. It can be used to produce plastic molds that require certain corrosion resistance. The quenching temperature is usually 1050°C. Due to the good hardenability, for small plastic molds, air can be used for cooling during quenching, thereby reducing the degree of heat treatment deformation of the mold; while for larger molds, oil quenching can be used. The quenched mold is usually tempered at 200-300°C, and the hardness after tempering is 50-53HRC.

Application of high carbon and high chromium stainless steel

For corrosion-resistant plastic molds that require high hardness and high wear resistance, you can choose high-carbon, high-chromium stainless steel, such as Cr14MoV. Its carbon content is 1.0%-1.15%. It has good hardenability, and the quenching temperature is usually The choice is 1100-1120°C oil cooling, the hardness is greater than or equal to 58 HRC, the tempering temperature is 500°C, kept for 2 hours, tempered 4 times, its hardness is greater than or equal to 60HRC. This kind of stainless steel has high hardness, high wear resistance and good corrosion resistance. The high temperature hardness is also relatively high. It is suitable for manufacturing plastic molds that can withstand high load and high wear resistance under the action of corrosive media.

Application of low carbon chromium-nickel corrosion-resistant stainless steel

1Cr17Ni2 stainless steel is a kind of martensitic stainless steel, acid-resistant steel, which has good corrosion resistance to aqueous solutions of oxygen acids and salts; it has high strength and suitable hardness.

The quenching temperature range of 1Cr17Ni2 steel is 950-1050℃ oil cooling. After quenching, low-temperature tempering or high-temperature tempering properties have relatively good corrosion resistance. After quenching and tempering at 200-300°C, the hardness of stainless steel is 38-40HRC. If it is cold treated, the austenite structure can continue to be transformed into Martensitic structure, the hardness can be increased to 42-48HRC, it has high strength and hardness, good wear resistance, and also has relatively good corrosion resistance. 1Cr17Ni2 martensitic stainless steel is mainly suitable for corrosion-resistant, high-precision plastic mold making.