Patent ID: 6652680
Filing Date: 2003-11-25
Classification: B21C,C21D,C22C,F41A

Abstract:
A method for producing tubes for heavy guns in the caliber range of 105 mm and greater, made from heat-treatable steel, consisting in wt.-% of0.20 to 0.50% carbon, max. 1.0% silicon, max. 1.0% manganese, max. 0.03% phosphorus, max. 0.03% sulfur, max. 0.1% aluminum, max. 4% nickel, max. 2% chromium, max. 1% molybdenum, max. 0.5% vanadium, and the remainder of iron and the customary impurities, said method comprising the steps of providing a forging of a open-melted cast ingot of said steel, pre-working the outside of said forged cast ingot on a lathe to prepare a solid blank, heat treating said solid blank by hardening and tempering, drilling a bore in said heat treated blank to form a tube, and finishing said tube to the desired dimensions.