SITHERM S360R is a modified steel grade able to achieve high work hardness in excess of 55HRC, while still retaining considerable impact and fracture toughness.
This grade is not subject to NADCA#229, but is tested according to the same level of mechanical properties as Grade B.
Compared to other conventional steels in this group, SITHERM S360R contains a higher carbon content and is modified with the addition of nickel. Higher carbon improves the achievable working hardness, which increases the wear resistance of die forging dies, hot stamping tools, hot cutting knives as well as tools for molding of abrasive plastics. It also improves the washout resistance of inserts used in high pressure die casting tools.
Nickel is added in order to improve the toughness, hardenability, and thermal conductivity of the steel. As a result, it helps to achieve more uniform properties across all sections of the tool.
Compared to other conventional steels in this group, SITHERM S360R contains a higher carbon content and is modified with the addition of nickel. This enhances the toughness, hardenability, and thermal conductivity of the steel (or the tools). As a result, it helps achieve more uniform properties across all sections of the tool.
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You can find more detailed information in the downloadable datasheet.

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