Production of steel tube for air bag, having high strength and high toughness

摘要: PROBLEM TO BE SOLVED: To produce a steel tube having high dimensional accuracy, excellent in workability and weldability, suitable for parts an air bag, requiring strength toughness. SOLUTION: A steel, composition consisting of 0.05-0.15% C, ≤0.50% Si, 0.30-2.00% Mn, ≤0.020% P, S, ≤0.10% Al, the balance Fe with inevitable impurities, is used. After making, resultant hardened at 850-1000°C and, cold-worked to prescribed size used this as-cold-worked state, or, after cold working annealing treatment applied. By method, tube, which has strength, toughness, enough be as accumulator also can obtained. COPYRIGHT: (C)1998,JPO