Drilling steel for induction hardening, has low alloy composition containing silicon, manganese, phosphorous, sulphur, chromium, molybdenum, nickel, titanium, aluminium and boron

摘要

The steel contains specific amounts of carbon, silicon, manganese, phosphorous, sulphur, chromium, molybdenum, nickel, titanium, aluminium and boron. A drilling steel, preferably for stationary induction hardening, comprises 0.3-0.5 wt.% carbon, 0.15-0.4 wt.% silicon, 1.1- 1.5 wt.% manganese, less than 0.035 wt.% phosphorous, 0.02-0.05 wt.% sulphur, less than 0.5 wt.% chromium, 0.03-0.15 wt.% molybdenum, 0.15-0.4 wt.% nickel, 0.02-0.05 wt.% titanium, less than 0.05 wt.% aluminium, less than 0.004 wt.% boron (total), more than 0.0005 wt.% soluble boron and the balance iron and impurities. An independent claim is also included for an axle made from this steel.