| Description | A manganese chromium alloy special steel for case hardening to EN 10084:2008 (steel number 1.7139), with controlled sulphur of 0.020 to 0.040% for better machinability. Supplied as semi-finished products, bars, rod, flat products and forgings (Table 1); intended for carburizing or carbonitriding and subsequent hardening, giving a hard surface layer and a tough core (clause 3.1). |