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    1銆�45铏�(h脿o)閶�

    GB/T699-1999妯�(bi膩o)婧�(zh菙n)瑕�(gu墨)瀹�45閶兼姉鎷夊挤(qi谩ng)搴︾偤600MPa锛屽眻鏈嶅挤(qi谩ng)搴︾偤355MPa锛屼几闀�(zh菐ng)鐜囩偤16%锛屾柗闈㈡敹绺巼鐐�40%锛屾矕鎿婂姛鐐�39J 銆�

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    2銆�40Cr

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