1.2312+QT
- Hardness
- 30 HRC
- Thermal Conductivity
- 34 W/(m·K)
- Elongation
- 8 %
- Chemical Composition
- C: 0.4%, Cr: 1.9%, Mn: 1.5%, Si: 0.4%, Mo: 0.2%, S: 0.08%, P: 0.02%
Other Names
- 40CrMnMoS8-6
- 19520+S
- 40CMD8S
- P 20+S
Material Description
1.2312 is normally supplied quenched and tempered (+QT), typically around 30 HRC, although the actual hardness depends on the manufacturer, section size and heat treatment. In large blocks, hardness may decrease toward the core, so always consider how the semi-finished material was supplied, especially when machining a part cut from a large section. Thanks to its sulphur addition, 1.2312 has very good machinability even in the pre-hardened condition. General-purpose tools, and in many cases tools intended for stainless steels, can still perform well. For higher tool life, more robust grades and geometries designed for higher-strength or pre-hardened steels can be used.