??·?????????????????????????
???????????????????????????????г???????????????????????????????????????????????г?????λ???????????????彻???????????棬ó??????????????????????????
?????·?????????????????
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???????????????й??????????????????????????????????ASTM??ASME????????JISS????????DIN????????BS????????? IO????????EN ???????????????????????????????????и???????????????????????????????8-600mm???4.5m ??????18m????????????????? ?????????????????????m??0.5mm????????100mm???8mm?????γ???1mm???и??????? 100mm?12.5????100mm?25???и??????????????
1??31?????????18*1800*8m???·???????????????????繫??
