ASTM A53 steel pipe designations are different than ASTM A500 round hollow structural sections and they are manufactured to meet different standards. While ASTM A500 is available in cross-sections matching each of the cross-sections for ASTM A53steel pipe, there are many more cross-sections available in A500. - Each pipe can be stenciled to show the manufacturer name,”Made in Canada“, the grade of pipe (ASTM A500), the kind of pipe (E for electric-resistance welded), the Grade (A, B or C), the size, length, the letters “HT“ if hydrostatically tested, and date. Structural Tubing or Hollow Structural Sections (HSS) are high-strength welded carbon steel tube used as structural members for construction applications and a variety of manufactured products. We produce round, square and rectangular shapes to meet both A500 B/C and A1085 ASTM specifications. We then go a step further to exceed your expectations for customer service …