... machinery parts,used for room frame structure and escalator in construction StandardAISI, ASTM, BS, DIN, GB, JIS ... good quality products.2.If you are interested in any of products, please contact us for more ... is a leading export company base in Tianjin, which specialized in steel.Our capacity of supply is ... 30,000,000 USD dollars.We have market share in the Middle East, Southeast Asia, South America, ...