... conveyance of gas, petroleum, liquid, and electricity; 2)We have engineering team for pipeline system building A: Size Range: Round pipe ... ,st45,st52,SAE,grade A,B etc.E: Conforms to international standards, like:Astm A106,179,192,199,200,210,213 ... our professional information, top quality products, best price, and efficient services.For all details, please never hesitate to contact us. schedule ...