??????????????????????????,????????????棗???? ???,??????X?,????????????????????,??????? ??????????????????????????????????????????? ?--???????,??????????????????????????????????? ????????????? ??:10#?20#?35#?45#?16-50Mn?27SiMn?40Cr?12-42CrMo?45Mn2?12Cr1MoV?38CrMoAL ?DZ40-7-?Cr5Mo?,??????????????????????????????????? ?? ????:????????????????GB/T8162-99????GB/T8163-99?????? YB528-65??????GB5312-85???????GB/T3087-99 ???????GB3087-2000????? ?GB5310-95??????API5CT???????YB235-70? ??????GB3088-82??????? GB6479-86???????GB173-98???????GB9948-88?????????????????? ??????????????,?????????????????????????????? ???X?? ?????????,???????????,??????????????,??X??? ???????? ???揦?????X?????X?????????????????,??????? ??????????????????,X????,?????,X????,???????? ??????,????? ???????????????????????????棗??????????????????????????????20#????42crmo?16mn?20crmnti?27simn????????????,?????????????????????????????????????????????????????????????????