Our company is specialized in the manufacture of solar mounting system profiles ,and solar mounting structure welding job. The material is made of American standard wide-flange H-beam with the size standard of ASTM A6. The steel grade can be selected between ASTM A572 GR50 /GR60, ASTM A992 or Q355. The hot-dip galvanizing meets ASTM A123, ISO1461 and AS/NZS4680 standards.