SKD12 pros and cons:
Features and Benefits:
—— SKD12 die steel has good toughness and thermal stability, and is not easy to fracture or deformation, which can ensure the stability and accuracy of the mold.
—— The high hardness ensures that the mold has good anti-wear performance, and can maintain precise size and surface quality for a long time.
- Good corrosion resistance makes the steel suitable for mold making and use in wet or corrosive environments.
Shortcoming:
—— SKD12 die steel is difficult to cut in the processing process, and appropriate cutting tools and methods need to be selected.
—— The high carbon and chromium content makes this steel unsuitable for welding, and is prone to weld cracks and deformation.
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Commonly used mold new steel grades
In order to make up for the shortcomings of traditional die steel grades, the following stamping die steels with better performance have been developed or introduced in China:
(1) CR12MO1V1 (code D2) steel is a steel type introduced to imitate D2 steel in the American ASTM standard, which belongs to CR12 section steel. Due to the increase in Mo and V content in D2 steel, the refinement of grains, and the improvement of carbide distribution, the strength and toughness (impact toughness, flexural strength, deflection) of D2 steel are improved compared with CR12MOV steel, and the wear resistance and temper resistance stability are also higher than those of CR12MOV. It can be cryogenic to increase hardness and improve dimensional stability. Punching dies made of D2 steel last longer than CR12MOV steel dies.
D2 steel has slightly worse forging properties and thermoplastic formability than CR12MOV steel, and the machinability and heat treatment process are similar to CR12 sections.
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(2) CR6WV steel is a high wear-resistant, micro-deformation and high-carbon medium-chromium steel, with lower carbon and chromium content than CR12 steel, and the distribution state of carbides is CR12MOV uniform, with good hardenability. The heat treatment deformation is small, and the machining performance is good. The flexural strength and impact toughness are better than those of CR12MOV, but the wear resistance is slightly lower than that of CR12 steel. It is used to withstand high hardness and high wear resistant sheet metal blanking dies that withstand large impact forces, and its effect is better than that of CR12 section steel.
The common heat treatment process of steel is: quenching temperature 9701 ~ 000 °C, generally hot oil or nitrate quenching and cooling, small parts can be air cooled. After quenching, it should be tempered immediately, the tempering temperature is 160210~ °C, and the hardness is 58~ 62HRC.
(3) CR4W2MOV steel is also a high wear-resistant, micro-deformation and high-carbon medium chromium steel, which is developed to replace CR12 steel, with good carbide uniformity and wear resistance higher than CR12MOV, which is suitable for making stamping dies with complex shapes and high dimensional accuracy requirements, and can be used for silicon steel sheet punching dies.
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CR4W2MOV Heat treatment process of steel: when high strength and toughness are required, low-temperature quenching and low-temperature tempering processes are adopted: quenching temperature 960~980 °C, tempering temperature 280~320 °C, hardness 60~62HRC. When high hot hardness and wear resistance are required, high-temperature quenching and high-temperature tempering processes are adopted: quenching temperature 1020~1040 °C, tempering temperature 50 0~540 °C, hardness 60~62HRC.