... *10 Surface:pickling or black Standard:AISI,ASTM,GB,JIS,BS,DIN Yong'ai mainly produces stainless steel round bars, hexagon bars ... S, 416,420,420 F.Standard: AISI, ASTM, GB, JIS, BS, DINUse: machine manufacture, vehicles, ships, construction, chemical industry, food industry ... won their praise and favor .Please be free to contact us for more information, if you are interested in our products ...