Tianjin Huilitong Steel Tube Co., Ltd. is a professional manufacturer of ERW steel pipes, SSAW steel pipes and Square/Rectangular steel pipes. We own the most advanced automation cold-formed forming machine and high-frequency straight resistance welding machine at home and abroad.we can produce ERW steel pipes vary from 88.9mm (3") to 457mm (18"), SSAW steel pipes vary from 219mm (8') to 2020mm. (80"), Square/Rectangle pipes vary from 15*15*0.5mm to 400*200*13mm. Our products are strictly conducted according to GB/T 3091-2001, GB/T 9711.1-1997, API 5L/5CT, EN10219, ASTM A53, ASTM A500 and other equivalent standards.