CRT A500 GrB BARE 4 x 3 x .312 WALL
CRT A500 GrB BARE 4 x 3 x .3125 WALL Please call for price discounts. These prices are full list. Call 888-558-1702 Cold-formed welded and seamless carbon steel structural tubing. ASTM AP15L is a standard specification published by the ASTM for cold-formed welded and seamless carbon steel structural tubing in round, square, and rectangular shapes. It is commonly specified in the US for hollow structural sections, but the more stringent CSA G40.21 is preferred in Canada. Another related standard is ASTM A501, which is a hot-formed version of this A500. ASTM A500 defines four grades of carbon steel based primarily on material strength.