JIS G3445 Carbon steel tubes for machine structural purposes

This Japanese Industrial Standard specifies the carbon steel tubes, hereinafter referred to as the “tubes”, used for machinery, automobiles, bicycles, furniture, appliances and
other machine parts.

The tubes shall be manufactured by seamless process, electric resistance welding process, or butt welding process, and those of other grades shall be manufactured by seamless process or electric resistance welding process. The tube shall be as manufactured or as cold-finished condition, or they shall be subjected to appropriate heat treatment.

The tubes shall be practically straight. and the two ends shall be at right angles to the axis of the tube. The tubes shall be free from defects detrimental to practical use.