Patent ID: 10494690

Abstract:
A high strength and toughness seamless steel tube for an automobile airbag, comprising the following elements, by wt %: C: 0.05-0.15%; Si: 0.1-0.45%; Mn: 1.0-1.9%; Ni: 0.1-0.6%; Cr: 0.05-1.0%; Mo: 0.05-0.2%; Cu: 0.05-0.50%; Al: 0.015-0.060%; Nb: 0.02-0.1%; V: 0.02-0.15%; and the balance being Fe and other inevitable impurities. A method for manufacturing the seamless steel tube comprises the steps: (1) heating a tube blank and then soaking; (2) hot piercing, reducing the diameter and the wall thickness of the tube blank with a stretch reducer and then cooling naturally; (3) annealing, pickling, phosphating and saponifying; (4) cold working to obtain a finished product size; and (5) carrying out stress relief annealing treatment.