中国、美国、日本、德国及国际标准化组织的常用钢号对照表，值得收藏！

                                      优质碳素结构钢情

                                            -普通碳素结构钢-

                                               合金工具钢

                                               高速工具钢

                                                     不锈钢

                                              易切削结构钢

                                           低合金结构钢