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GB/T 4171 Q235NH BBN is the China Iron and steel supplier/factory,offer GB T 4171 Q295NH corten steel plate for Mild Steel Sheet GB T 4171 after sale service with The applicable equivalent ASTM specifications for weathering steel are ASTM A588, ASTM A242, steel sheet, steel coil, steel.gb t 4171 q550nh weather steel factory supplier - Steel , gb/t 4171 q295nh factoryGB/T 4171 Q235NH BBN is the China Iron and steel supplier/factory,offer GB T 4171 Q295NH corten steel plate for Mild Steel Sheet GB T 4171 after sale service with The applicable equivalent ASTM specifications for weathering steel are ASTM A588, ASTM A242, steel sheet, steel coil, steel.