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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ob 屈服强度OS/MPaIIIIIIIIIIIIIIIIIIIIIIIIO1OiOiOOOTnTnTnTTT普 通 碳 钢Q215100热扎o,335410 bo s185215145125901751401059590601009060Q235o,375460 bo s205235160140100190160120105956511010070Q275o,490610 bo s2352751751501102101701301151057012011080优质碳20
2、100正火410bo s245175145105210165125115105701201057525ok 450 bos275195160115230175135125115751351208035ok 530 bo s3152101801252502001501351208014512085调质o 550750 bo s320370210185130250205155135125851451208545正火ok 600 bo s3552302001452702201701501359016014095调质o 630800 bo s370430250215150300235180160150
3、1001751501005025正火o 630 bo s375250215150300235180160150100175150100钢700。s400265235165310260195170155105180160110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ob 屈服强度os/MPaIIIIIIIIIIIIIIIIIIIIIIIIoioioioooTnTnTnTTTZG200400100正火及回火400bo s20013512090160135105908060958560ZG230450450 bos2301551401001
4、8515512010085651109065ZG270500o 500 bos2701751601152101751351151007512010575ZG310 570oK 570 bos3101901701252301901451251058013011080ZG340640oK 640 bo s3402001801302402051551301158714012087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IIIIIIIIIIIIIIIIIIIIITTTTTTHT-1502.5 105007001751408050282
5、050302345241810 201451408041241741251937201520 301301408037211537221733181330 5012014080341914342115311712HT-2002.5 1060080022017010063362563382857312310 2019517010056322256332550272020 3017017010049281949292244241730 50160170100462618462721412216HT-2504.0 10800100027023013077443177463569372810 2024
6、023013069392769413162332520 3022023013063362563382857312330 50200230130573223573426512821HT-30010 201000120029028516083473383503775403020 3025028516071412971433264352630 50230285160663726663930593224HT-35010 201100130034031518097553997584487473520 3029031518083473383503775403030 50260315180744230744
7、433673627附表钢铁的许用应力（kgf/cm2）载荷软钢中硬钢铸钢钢铁I900-150012001800600-1200300拉伸II600-10008001200400-600200III300-500400600200-400100I900-150012001800900-1500900压缩II600-10008001200600-1000600I900-150012001800750-1200弯曲II600-10008001200500-800III300-500400600250-400I720-1200960-1440480-960300_、r 剪切II480-800640-9
8、60320-640200III240-400320-480160-320100I60012009001440480960扭 转II400800640960320640III200400320480160320（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。许用应力okgf/cm2材料kgf/cm2稳定载荷冲击或脉动载荷反复父变载荷4000130070040050001700750450碳素钢60002000950550700023001100650Av/V800027001300750合金钢100003300160090040001000500300铸钢5
9、000120070040035火火 火 正火+回火45火火 火 正火+回火35SiMn42SiMn40MB38SiMo40Cr毛坯直径(mm)25100 300300500500750100 30025100 30030050050070020025100 30030040040050025200100 30030050050080025100 300 bkgf/mm?54525048465654 skgf/mm?32272624233028 -1kgf/m262524232226.525.5硬度HB187143187143187137187131187163201144201许用弯曲应力wkgf/cm211001050100096092011001080616058565465908075706510075757270601007570乐3630292827367552454038805060555040805250AA2827.52726253046403532.531.5503638363
