鋼鐵材料許用應(yīng)力

1、表1普通碳鋼及優(yōu)質(zhì)碳鋼構(gòu)件基本許用應(yīng)力/MPa材料類型材料標(biāo)號(hào)截面尺寸/mm熱處理材料性能拉 壓彎 曲扭 轉(zhuǎn)剪 切抗拉強(qiáng)度。b屈服強(qiáng)度OS/MPa1IIIII1IIIII1IIIII1IIIIIOlOlOlOOOTnTnTnTTT普 通 碳 鋼Q215100熱扎叩35410 o s185215145125901751401059590601009060Q235o b375460o s205235160140100190160120105956511010070Q275Ob490610 o s2352751751501102101701301151057012011080優(yōu)質(zhì)20W100正火ob

2、410os245175145105210165125115105701201057525Ob450 os275195160115230175135125115751351208035Ob530 os3152101801252502001501351208014512085調(diào)質(zhì)Ob550750 os3203702101851302502051551351258514512085碳鋼45正火氣600 as3552302001452702201701501359016014095調(diào)質(zhì)氣630800 as37043025021515030023518016015010017515010050W25正火

3、ab630as375250215150300235180160150100175150100W100調(diào)質(zhì)氣700 as400265235165310260195170155105180160110表2碳鋼鑄件基本許用應(yīng)力/MPa材料標(biāo)號(hào)截面尺寸/mm熱處理材料性能拉 壓彎 曲扭 轉(zhuǎn)剪 切抗拉強(qiáng)度ab屈服強(qiáng)度as/MPa1IIIII1IIIII1IIIII1IIIIIaiaiaiaaaTnTnTnTTTZG200400100正火及回氣400as20013512090160135105908060958560ZG230450氣450as2301551401001851551201008565110

4、9065ZG270500叩00 as2701751601152101751351151007512010575ZG310570火叩7。 ns3101901701252301901451251058013011080ZG340640氣640 os3402001801302402051551301158714012087表3灰鑄鐵基本許用應(yīng)力/MPa材料標(biāo)號(hào)壁厚/mm抗壓強(qiáng)度/MPa抗拉強(qiáng)度/MPa中心抗壓彎 曲扭 剪壓拉拉壓1II1IIIII1IIIII1IIIIIOOOOOTTTTTTHT-1501050070017514080502820503023452418102014514080412

5、417412519372015203013014080372115372217331813305012014080341914342115311712HT-20010600800220170100633625633828573123102019517010056322256332550272020301701701004928194929224424173050160170100462618462721412216HT-2501080010002702301307744317746356937281020240230130693927694131623325203022023013063362

6、56338285731233050200230130573223573426512821HT-30010201000120029028516083473383503775403020302502851607141297143326435263050230285160663726663930593224HT-35010201100130034031518097553997584487473520302903151808347338350377540303050260315180744230744433673627附表鋼鐵的許用應(yīng)力（kgf/cm2）載荷軟 鋼中硬鋼鑄鋼鋼鐵190015001200

7、18006001200300拉伸II6001000800 1200400600200III300500400 60020040010019001500120018009001500900壓縮600100080012006001000600I9001500120018007501200彎 曲II6001000800 1200500800III300500400 600250400I72012009601440480960300剪 切II480800640960320640200III240400320480160320100I60012009001440480960扭 轉(zhuǎn)II4008006409

8、60320640III200400320480160320（注）載荷指I:靜載荷II:重復(fù)載荷III:交變載荷表4許用彎曲應(yīng)力。3材料極限強(qiáng)度。kgf/cm2許用應(yīng)力。kgf/cm2穩(wěn)定載荷沖擊或脈動(dòng)載荷反復(fù)交變載荷40001300700400碳素鋼5000170075045060007000200023009501100550650合金鋼8000100002700330013001600750900鑄鋼4000500010001200500700300400毛坯直徑(mm)機(jī)械性臺(tái)匕能硬度HB許用彎曲鋼號(hào)處理Qbo so-1應(yīng)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調(diào)質(zhì)W100805240229286140042SiMn100300754535217269140040MB調(diào)質(zhì)30040017040501750史200W1007575506036382282861450150038SiMo調(diào)質(zhì)10030072553621726914503005007050351972411400251008050175040Cr調(diào)質(zhì)W1007552372412861500表5軸的常用材料及許用彎曲應(yīng)力30表6軸類零件允許變形的參考數(shù)值變形名稱變形允許值撓度V一般用途的軸需要提高剛度的轉(zhuǎn)軸安裝齒輪的軸V =Lv=l轉(zhuǎn)角 e滑動(dòng)