鋼鐵材料的許用應(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Ob屈服強(qiáng)度Os/MPaIIIIIIIIIIIIIIIIIIO1O1O1OOOnnn普通碳鋼Q215100熱扎Ob335410Os185215145125901751401059590601009060Q235Ob375460Os205235160140100190160120105956511010070Q275Ob490610Os2352751751501102101701301151057012011080優(yōu)質(zhì)碳鋼20100正火Ob410Os24517514510521016

2、5125115105701201057525Ob450Os275195160115230175135125115751351208035Ob530Os3152101801252502001501351208014512085調(diào)質(zhì)Ob550750Os320370210185130250205155135125851451208545正火Ob600Os3552302001452702201701501359016014095調(diào)質(zhì)Ob630800Os3704302502151503002351801601501001751501005025正火Ob630Os375250215150300235180

3、160150100175150100700Os400265235165310260195170155105180160110材料標(biāo)號截面尺寸/mm熱處理材料性能拉壓彎曲扭轉(zhuǎn)剪切抗拉強(qiáng)度ob屈服強(qiáng)度os/MPaIIIIIIIIIIIIIIIIIIoioioiooonnnZG200400100正火及回火ob400os20013512090160135105908060958560ZG230450ob450os23015514010018515512010085651109065ZG270500ob500os2701751601152101751351151007512010575ZG310570o

4、b570os3101901701252301901451251058013011080ZG340640ob640os3402001801302402051551301158714012087表3灰鑄鐵基本許用應(yīng)力/MPa材料標(biāo)號壁厚/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IIIIIIIIIIIIIIIIIIIII。i。i。i。i。iHT-1502.510500700175140805028205030234524181020145140804124174125193720152030130140803721153722173318133050120140803419143

5、42115311712HT-2002.510600800220170100633625633828573123102019517010056322256332550272020301701701004928194929224424173050160170100462618462721412216HT-2504.0108001000270230130774431774635693728102024023013069392769413162332520302202301306336256338285731233050200230130573223573426512821HT-30010201000

6、120029028516083473383503775403020302502851607141297143326435263050230285160663726663930593224HT-35010201100130034031518097553997584487473520302903151808347338350377540303050260315180744230744433673627載荷軟鋼中硬鋼鑄鋼鋼鐵I9001500120018006001200300拉伸II60010008001200400600200III300500400600200400100I90015001200

7、18009001500900壓縮II600100080012006001000600I9001500120018007501200彎曲II60010008001200500800III300500400600250400I72012009601440480960300剪切II480800640960320640200I240400320480160320100I60012009001440480960扭轉(zhuǎn)II400800640960320640I200400320480160320附表鋼鐵的許用應(yīng)力（kgf/cm2）（注）載荷指I：靜載荷II：重復(fù)載荷III：交變載荷材料極限強(qiáng)度。kgf/cm

8、2許用應(yīng)力Okgf/cm2穩(wěn)定載荷沖擊或脈動載荷反復(fù)交變載荷碳素鋼400050006000700013001700200023007007509501100400450550650合金鋼8000100002700330013001600750900鑄鋼4000500010001200500700300400表4許用彎曲應(yīng)力。狽鋼號處理毛坯直徑(mm)機(jī)械性能硬度HB許用彎曲應(yīng)力9wkgf/cm2。bkgf/mm2askgf/mm2a-1kgf/mm2正火255432261871100正火100300502624143187100035正火+回火3005004824231371879605007

9、50462322131187920調(diào)質(zhì)100300542825.51442011080正火256136282411150正火1003005829271632071130正火+回火30050056282615620710805007005427251492071050調(diào)質(zhì)200653630187229125025907546160035SiMn100300754535217269140042SiMn300400704032.52172551350400500653831.5197255130040MB調(diào)質(zhì)2520010075805050362402901750145010030072553621

10、72691450300500705035197241140050080060403018624112502510080501750100300705035241286148030050065403122926013005008006035292172601200表5軸的常用材料及許用彎曲應(yīng)力30注：表中。-1適用于4V8,如果光潔度提高或降低，。-1應(yīng)相應(yīng)提高或降低515%。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)軸安裝齒輪的軸安裝蝸輪的軸V=(0.00030.0005)1V=0.0002lV=(0.010.05)mnV=(0.010.05)m：轉(zhuǎn)角0滑動軸承向心球軸承向心球面軸承圓柱滾子軸承圓錐滾子軸承安裝齒輪的軸承0=0.001rad0=0.005rad0=0.005rad0=0.0025rad0=0.0016rad0=0.001rad注：I軸承之間的長度(mm)；m齒輪法面模數(shù)(mm);Mt蝸輪的端面模數(shù)(mm)。表7軸彎曲的允許