... ect. Dimension:50*37-400*104 channel steel bar(high quality and low price)The products of Hengji Steel include ERW ... steel in coils, etc. The application of our products covers oil, natural gas, shipbuilding, chemical industries, environmental protection, ... steel structural products, building, etc. The company implements international and domestic standards including API SPEC 5CT, API SPEC5L,ASTMA53, ...