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????GB/T3639?????????

??繫??????
????緶Χ	GB/T3639(GB8713)	DIN2391(EN10305)	???????????Χ	????Χ
4mm-30mm	??0.10mm	??0.08mm	??0.05mm	??0.02mm
31mm-40mm	??0.15mm	??0.15mm	??0.05mm	??0.03mm
41mm-50mm	??0.20mm	??0.20mm	??0.05mm	??0.03mm
51mm-60mm	??0.25mm	??0.25mm	??0.08mm	??0.03mm
61mm-70mm	??0.30mm	??0.30mm	??0.10mm	??0.05mm
71mm-160mm	??0.30mm	??0.30mm	??0.10mm	??0.05mm
?????Χ	??0.12mm	??0.10mm	??0.05mm	??0.03mm

??????	???	??????????			??б??
		???????? b(MPa)	??????? s(MPa)	??????? 5(%)
??????? BKS (+Sra)	?????????? ??A1?????????	St35(10#)	??420	??315	??14
		St45(20#)	??520	??375	??12
		St52(16Mn)	??580	??420	??10
??? GBK (+A)	??????????????? ??????????????????????	St35(10#)	??315		??35
		St45(20#)	??390		??32
		St52(16Mn)	??490		??30
???? NBK (+N)	??????????????????????? ???????????????????????	St35(10#)	340-470	??235	??32
		St45(20#)	440-570	??255	??30
		St52(16Mn)	490-630	??355	??28