??????????????20#???????20G??????????????????
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20#??45#??е????ú????????????
20#??45# 245*30*35*38*40*45*50*55*60 ?????????????0635-8884428
20#??45# 273*30*35*38*40*45*50*55*60 ?????????????0635-8884428
20#??45# 299*30*35*38*40*45*50*55*60 ?????????????0635-8884428
20#??45# 325*30*35*38*40*45*50*55*60 ?????????????0635-8884428
20#??45# 377*30*35*38*40*45*50*55*60 ?????????????0635-8884428
20#??45# 402*30*35*38*40*45*50*55*60 ?????????????0635-8884428
20#??45# 406*30*35*38*40*45*50*55*60 ?????????????0635-8884428
20#??45# 426*30*35*38*40*45*50*55*60 ?????????????0635-8884428
20#??45# 457*30*35*38*40*45*50*55*60 ?????????????0635-8884428
20#??45# 480*30*35*38*40*45*50*55*60 ?????????????0635-8884428
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?????????????????????????????????????????????κ????????????????????????
????????????????:[(??-???)*???]*0.02466=kg/??(????????)
??????????????????????????????????-?????????0.02491=KG/M????????????
?????????????????????????????????-?????????0.02486=KG/M????????????
?????????????????????????????????????????????????????????????????????????????????????????С???????????????????????????????????????????????????????????,??????????????20#??45#??16MN??Q345??A/B/C/D/E????27SIMN??15CrMO??12Cr1MOV??10CrMO910??304??304L??316??316L??321??P11??P22??P91??T91.??й???GB8162-99?????GB8163-99????????????ù?????????GB3087-99??GB5310-85????????ˉ?ù??GB5312-8???ù??...
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