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SK3 and SK5 Steel for Tools

The amount of carbon content of SK materials is 0.6 to 1.5%. The SK materials are available in various types, from Type 1 to Type 7. SK1 has a carbon content ratio of 1.3 to 1.5% while SK7 has a carbon content ratio of 0.6 to 0.7%. The carbon content ratio of the material decreases from SK1 to SK7. By the way, when the carbon content ratio becomes less than or equal to 0.6%, the material becomes a material for machine structures (SC material).
In press dies, SK3 and SK5 are used very often.
The method of their use in press dies is for punches and dies for small production volumes.
Since the hardness of SK materials is weak towards heat, even after sufficient hardening, it is not possible to expect long life when used for items that generate machining heat such as in press blanking operations. Because of this, rather than using these materials for punches and dies, it is very common to use these materials as supplementary part such as packing plates, etc.

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