Method of manufacturing high strength steel tubing from a steel composition and components thereof

A method of manufacturing tubing from a steel composition, in particular for a stored gas inflator pressure vessel, comprising:

• a) producing a steel tubing from a steel composition including at least one hot rolling or hot forming pass;
• b) subjecting the steel tubing to a cold-drawing process to obtain desired dimensions, wherein the cold-drawing process comprises at least two pulls and before the final pull of the cold-drawing process an intermediate austenizing and quenching step;
• and
• c) subsequent to the final pull of the cold-drawing process performing a final recovery heat treatment on the cold-drawn steel tubing at a temperature in the range of 200-600° C.
• wherein the steel composition comprises, in wt. %,
• C:
• 0.04-0.15;
• Mn:
• 0.90-1.60;
• Si:
• 0.10-0.50;
• Cr:
• 0.05-0.80;
• Al 0.01-0.50;
• N 0.0035-0.0150;
• Mo:
• 0-0.50;
• Ni:
• 0-0.50;
• Cu 0-0.25;
• V 0-0.40;
• Nb 0-0.20;
• Ti 0-0.10;
• B 0-0.005;
• Ca 0-0.005,
• As 0-0.05;
• Sb 0-0.05;
• Sn 0-0.05;
• Pb 0-0.05,
• Bi 0-0.005;
• S 0-0.015;
• P 0-0.025;
• the remainder being Fe and other inevitable impurities.