钢铁材料许用应力

1、表1普通碳钢及优质碳钢构件基本许用应力/MPa材料类型材料标号截面尺寸/mm热处理材料性能拉 压弯 曲扭 转剪 切抗拉强度。b屈服强度OS/MPa1IIIII1IIIII1IIIII1IIIIIOlOlOlOOOTnTnTnTTT普 通 碳 钢Q215100热扎叩35410 o s185215145125901751401059590601009060Q235o b375460o s205235160140100190160120105956511010070Q275Ob490610 o s2352751751501102101701301151057012011080优质20W100正火ob

2、410os245175145105210165125115105701201057525Ob450 os275195160115230175135125115751351208035Ob530 os3152101801252502001501351208014512085调质Ob550750 os3203702101851302502051551351258514512085碳钢45正火气600 as3552302001452702201701501359016014095调质气630800 as37043025021515030023518016015010017515010050W25正火

3、ab630as375250215150300235180160150100175150100W100调质气700 as400265235165310260195170155105180160110表2碳钢铸件基本许用应力/MPa材料标号截面尺寸/mm热处理材料性能拉 压弯 曲扭 转剪 切抗拉强度ab屈服强度as/MPa1IIIII1IIIII1IIIII1IIIIIaiaiaiaaaTnTnTnTTTZG200400100正火及回气400as20013512090160135105908060958560ZG230450气450as2301551401001851551201008565110

4、9065ZG270500叩00 as2701751601152101751351151007512010575ZG310570火叩7。 ns3101901701252301901451251058013011080ZG340640气640 os3402001801302402051551301158714012087表3灰铸铁基本许用应力/MPa材料标号壁厚/mm抗压强度/MPa抗拉强度/MPa中心抗压弯 曲扭 剪压拉拉压1II1IIIII1IIIII1IIIIIOOOOOTTTTTTHT-1501050070017514080502820503023452418102014514080412

5、417412519372015203013014080372115372217331813305012014080341914342115311712HT-20010600800220170100633625633828573123102019517010056322256332550272020301701701004928194929224424173050160170100462618462721412216HT-2501080010002702301307744317746356937281020240230130693927694131623325203022023013063362

6、56338285731233050200230130573223573426512821HT-30010201000120029028516083473383503775403020302502851607141297143326435263050230285160663726663930593224HT-35010201100130034031518097553997584487473520302903151808347338350377540303050260315180744230744433673627附表钢铁的许用应力（kgf/cm2）载荷软 钢中硬钢铸钢钢铁190015001200

7、18006001200300拉伸II6001000800 1200400600200III300500400 60020040010019001500120018009001500900压缩600100080012006001000600I9001500120018007501200弯 曲II6001000800 1200500800III300500400 600250400I72012009601440480960300剪 切II480800640960320640200III240400320480160320100I60012009001440480960扭 转II4008006409

8、60320640III200400320480160320（注）载荷指I:静载荷II:重复载荷III:交变载荷表4许用弯曲应力。3材料极限强度。kgf/cm2许用应力。kgf/cm2稳定载荷冲击或脉动载荷反复交变载荷40001300700400碳素钢5000170075045060007000200023009501100550650合金钢8000100002700330013001600750900铸钢4000500010001200500700300400毛坯直径(mm)机械性台匕能硬度HB许用弯曲钢号处理Qbo so-1应力owkgf/mm2kgf/mm2kgf/mm21,kgl/CII

9、|2正火25543226W1871100正火W100522725143187105035正火1003005026241431871000正火+回火300500482423137187960正火50075025466123362228131187 W241920115045正火W10060301702071150正火1003005829271632071130正火+回火300500562826156207108035SiMn259075461600调质W100805240229286140042SiMn100300754535217269140040MB调质30040017040501750史200W1007575506036382282861450150038SiMo调质10030072553621726914503005007050351972411400251008050175040Cr调质W1007552372412861500表5轴的常用材料及许用弯曲应力30表6轴类零件允许变形的参考数值变形名称变形允许值挠度V一般用途的轴需要提高刚度的转轴安装齿轮的轴V =Lv=l转角 e滑动