... cheap but firm 3)Applied in building engineering 1.good quality and price 2.quick construction 3.reliable bearing 4. ... 20*1.8WALL THICKNESS1.3-2.5MM SHAPE AVAILABLEC shapeSTANDARDASTM A500 Cr.B , AST Cr.C JIS SS330, JIS SPHC, JIS SPHD ... , less than 20 daysMOQ10TONSPRODUCTIVITY4000 tons per monthREMARKanti corrsion and high temperature resistang with black surfaceall the production process are made ...