Thin Wall Steel Tube A steel tube having a ratio of the outer diameter of the steel tube to the wall thickness of more than 20 is referred to as a thin-walled steel tube. Thin-walled steel tubes and thin-walled steel pipes are all cold drawn. Among them, carbon steel, low alloy steel, alloy steel thin wall tube is suitable for general structure and mechanical structural parts; thin wall fluid steel tube is used for conveying general fluid; stainless steel thin wall tube is used for chemical, petroleum, light industry, food, mechanical instrument, etc. Industrial heat-resistant containers, conveying pipes and mechanical structural parts.