钢铁材料的许用应力

1、表1普通碳钢及优质碳钢构件基本许用应力/MPa材材料性能L压弯 曲扭 转剪 切料 类材料截面尺寸/mm热处 理抗拉强度（7b 屈服强度（7S /MPaInmInmInmInm型(T l(T l(T l(TTTT普Q215执(T b335410(T S185215145125901759590601009060通 碳Q235100扎b b375460d S205235160140100190160120105(T(T11010070钢Q275b b490610d S2352751751501102101701301151401051201108020正火bb410(rs2451751451052

2、101651251151057012010575优25bb450(rs275195160115230175135125115751351208035 100b b530(rs3152101801252502001501351208014512085质调质b b550750b S3203702101851302502051551351258514512085碳45正火bb600(ts3552302001452702201701501359016014095调质b b630800b s370430250215150300235180160150100175150100钢5025正火b b630(r

3、s375250215150300235180160150100175150100700(rs400265235165310260195170155105180160110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（7b 屈服强度（7S /MPaInmInmInmInm(T l(T l(T l(T(T(TTTTZG200400100正 火 及 回 火(rb400(ts20013512090160135105908060958560ZG230450(rb450(ts23015514010018515512010085651109065ZG270500(rb500(ts2

4、701751601152101751351151007512010575ZG310 570(rb570(ts3101901701252301901451251058013011080ZG340640(rb640(ts3402001801302402051551301158714012087表2/MPa碳钢铸件基本许用应力材料标号壁 厚/mm抗压强度 /MPa抗拉强度/MPa中心抗压弯 曲扭 剪压拉拉压IRInmInmInm(T l(T l(T l(T l(T lTTTTTTHT-1502.51050070017514080502820503023452418102014514080412417

5、412519372015203013014080372115372217331813305012014080341914342115311712HT-2002.5-10600800220170100633625633828573123102019517010056322256332550272020301701701004928194929224424173050160170100462618462721412216HT-2504.0108001000270230130774431774635693728102024023013069392769413162332520302202301306

6、336256338285731233050200230130573223573426512821HT-300 10201000120029028516083473383503775403020302502851607141297143326435263050230285160663726663930593224HT-35010201100130034031518097553997584487473520302903151808347338350377540303050260315180744230744433673627表3/MPa灰铸铁基本许用应力附表一、-2 钢铁的许用应力（kgf/cm

7、）载荷软 钢中硬钢铸钢钢铁I9001500120018006001200300拉 伸R6001000800 1200400600200m300500400 600200400100I9001500120018009001500900压 缩R6001000800 12006001000600I9001500120018007501200弯 曲R6001000800 1200500800m300500400 600250400i72012009601440480960300剪 切n480800640960320640200m240400320480160320100i600120090014404

8、80960扭 转n400800640960320640m200400320480160320（注）载荷指 I:静载荷n：重复载荷 m ：交变载荷材 料极限强度（7r2kgf/cm许用应力kgf/cm2稳定载荷冲击或脉动载荷反复交父载荷钢 素 碳400050006000700013001700200023007007509501100400450550650合金钢8000100002700330013001600750900铸钢4000500010001200500700300400表4许用弯曲应力钢号处理毛坯直径 (mm)机械性台匕 目匕硬度HB许用弯曲 应力(rw kgf/cm2(T b1

9、2,2kgf/mm0- s2kgf/mm(T -1中2 kgf/mm正火25543226 1871100正火100300502624143187100035正火+回火300500482423137187960500750462322131187920调质100300542825.51442011080正火256136282411150正火100300582927163207113045正火+回火30050056282615620710805007005427251492071050调质200653630187229125025907546160035SiMn100300754535217269

10、140042SiMn300400704032.52172551350400500653831.5197255130040MB调质251008050175020075503624029014501003003005007255362172691450705035197241140050080060403018624112502510080501750100300705035241286148030050065403122926013005008006035292172601200表5轴的常用材料及许用弯曲应力30注：表中(T-1适用于 4、8如果光洁度提高或降低，6-1应相应提高或降低515%表6轴类零件允许变形的参考数值义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 安装蜗轮的轴v =(0.0003 0.0005) lv =0.0002 lv =(0.01 0.05)mnv =(0.01 0.05)mt转角9滑动轴承 向心球轴承 向心球曲轴承 圆柱滚子轴承 圆锥滚子轴承 安装齿轮的轴承9 =0.001rad9 =0.005rad9 =0.005rad9 =0.0025rad9 =0.0016rad9 =0.001rad注：I轴承之间的长度（mm）； mn齿轮法面模数（mm）；Mt蜗轮的端面模数（mm）。表7轴弯曲的允许变形量30名称挠度允