易切削结构钢中国国际标准前苏联德国美国日本英国法国GBISOTOCTDINUNSAISIJISBSNFY12Ios20A12Ios20G121201212Sum12210m1513mf4Y12pbIosb20Iospb20G1213412L13Sum221Y1515S2015S20G121301213Sum22220m07S250Y15pbIi***npb28Ac149***npb28G1214412L14Sum24LS250pbY2022S20A2022s20G112001120Sum3218mf5Y30A30G113201132Y3535S20A3535S20G11370113721M3b35mf6Y40mn44***n28A40TG114401144Sum42225m4445mf6电话：0769-8187103513925596264张先生，谢谢！)