???-???,1905???,??66%??31.5%???????????.??????????????????,????????????.????Ncu28 2.5 1.5,
????????,??1316?,??????HRb50.??????????????????????,??????????MLL W 6712B???.??????????????,????????.?????????????????????,????????????????????????.??????????0 0003mm/a;??????????0 03mm/a.???????????(????????????)???????????????????,
??,??????????????.?400??????,????????.????????????????,???????/5???????????.?????????????????????????????????????????????????????.????:???????????????????????????,
???????????????????(?),?????,??????????????.
????:
?????????????
IP??????
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??????(???????????????)
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????CV??????CV????
API,
????????? 5???????????,ANSI,ASTM,ASME?????????????