... steel bar(high quality and low price) Steel Grade:Q235,ASTMA53, ect. Dimension:50*37-400*104 channel steel bar(high quality and low price)The products ... steel structural products, building, etc. The company implements international and domestic standards including API SPEC 5CT, API SPEC5L,ASTMA53,CB ... .1, GB/T9711.2, BV/T13793, SY/T5768 for its products which will satisfy the needs of clients having ...