ASTM A500 is a standard specification published by ASTM International for cold-formed welded and seamless carbon steel structural tubing in round, square, and rectangular shapes.

ASTM A53 is a carbon steel alloy, which can be used as structural steel or for low-pressure pipelines.

Hot rolled seamless steel tube: hot rolling is related to the cold drawn, hot rolling is performed above the recrystallization temperature of the rolling.