1.2312 Steel 1.2312 steel uses Cr-Mn-Mo as strengthening alloy elements and adds a higher content of sulfur (0.05-0.1%) to make it more machinable. It is expected that the milling speed can be increased by 30% and the drilling speed can be increased by 300%. 1.2312 steel has excellent cutting performance, good toughness and wear resistance, stable dimensions after processing, and uniform hardness. DIN 1.2312 is generally supplied in a pre-hardened state with a hardness of 280-320HB. ASTM P20+S steel is equivalent to DIN 1.2312 material. Generally, 40CrMnMoS8-6/1.2312 and P20+S mold steel will have the same properties for final application. Supply Range of 1.2312 Material Round Bar: diameter 20mm â?? 500mm Steel Plate and Steel Block: thickness 12-300mm x width 200-2300mm (*20-120mm plate in stock in prehardened condition) Surface Finish: Black Surface, Roughly Machined, Peeled & Turned or as per given requirements.