精密无缝钢管20#45#精密无缝钢管力学性能20#45#精密无缝钢管力学性能钢种力学性能冷拔（轧）管金切管20#抗拉强度σbN/mm2伸长率δ5%≥510≥390≥5≥2045#≥647≥590≥4≥4加工形式缸径长度直线度尺寸精度内孔粗糙度冷轧30-100≤12M0.3-1.0H8-H100.4-1.6冷拔30-250≤12MH8-H100.8-1.6珩磨40-500≤12M1000H8-H90.4-0.8滚压40-400≤7MH80.4尺寸公差尺寸公差（壁厚偏差±5%）内径尺寸H8H9H1030+0.0330+0.0520+0.0840＞30-50+0.0390+0.0620+0.1000＞50-80+0.0460+0.0740+0.1200＞80-120+0.0540+0.0870+0.1400＞120-180+0.0630+0.1000+0.1600＞180-250+0.0720+0.1150+0.1850＞250-315+0.0810+0.1300+0.2100＞315-400+0.0890+0.1400+0.230020#45#精密无缝钢管规格20#45#精密无缝钢管规格规格规格规格规格规格规格规格规格8*223*330*638*2.550*258*368*378*810*2.523*432*238*350*2.558*468*480*216*224*232*2.538*3.550*358*668*680*316*2.524*332*338*450*459*270*280*416*324*432*3.538*650*659*370*380*617*225*232*440*251*259*470*480*817*2.525*332*540*351*359*670*680*1217*325*432*640*451*460*272*281*218*227*234*240*552*260*372*381*418*2.527*334*2.540*652*360*472*481*618*327*434*342*252*460*672*681*819*228*234*442*352*662*275*281*1219*2.528*2.534*542*453*262*375*382*419*328*334*642*653*362*475*482*619*3.528*3.535*245*253*462*675*682*820*228*435*2.545*353*664*275*882*1220*2.529*235*345*455*264*376*283*420*329*335*445*655*364*476*383*621*229*435*546*255*464*676*483*821*330*235*646*355*665*276*683*1221*430*2.536*246*457*265*376*885*422*230*336*2.548*257*365*478*285*622*330*436*348*357*465*678*385*822*430*536*448*457*668*278*485*1223*238*258*278*6精密无缝钢管标准规格|精密无缝钢管每米理论重量外 径壁 厚单重kg/m外 径壁 厚单 重外 径壁 厚单重kg/m3632.441141230.18170520.344054.32108410.26172624.56452.52.62114718.471801041.92515.56.1712110.528.611841250.90552.53.2412713.537.791941774.206056.781194.512.71192627.52636.59.0613311.534.46194732.28657.510.631401546.4220311.554.31701014.801401032.0621919.595.936557.401461342.64216841.03707.511.56135516.032199.549.087058.011407.524.5124020108.501757.512.4815213.546.1124522.5123.456934.881591759.5324512.571.67724.57.49152621.6027326.5161.09766.511.141599.535.002701064.12831018.0016311.542.9629924.5165.80836.512.261681453.1732522.5167.8486815.391781974.5032512.596.338636.141802078.9135125.5204.68