... of Origin: Shandong ,ChinaMaterial : ASTM A106Gr.A ASTM A106Gr.B ASTM A53Gr.B ASTM A179, ASTM A192, ASTM A210-A-1 , and ... : The products are widely used in fertilizer, petroleum, boiler, power station , shipping , chemical industry ,environment protection , traffic, food industry ,medical equipment ... . Haphry Wu ; Tel: 0086-13963583000 steel pipes astm a53 gr.b (longitudinal weld)