高压锅炉用无缝钢管机械机能|高压锅炉用无缝钢管化学成分

　高压锅炉用无缝钢管标准：GB5310国度标准用处：用于高压锅炉（工作压力一般不大于9.8Mpa，工作温度在450℃650℃之间）的受热面管子、集箱、省煤器、过热器、再热器等。（P＜9.8MPa,450℃＜T＜650℃）尺寸公差钢管种类钢管尺寸mm许可误差通俗级高等热轧(挤)管外径D≤159+1.0%(小值为+0.5mm)+0.75%(小值为+0.3mm)>159+1.0%+0.90%壁厚S<3.5+15%(小值为+0.48mm)10% (小值为0.32mm)+1.0%(小值为+0.2mm)3.5~20+15%10%+10%>20D<219+10%+7.5%D≥219+12.5%10.0%+10%冷拔(轧)管外径D≤30+0.20mm+0.15mm>30~50+0.30mm+0.25mm>50+0.8%+0.6%壁厚S2~3+12%10%+10%>3+10%+7.5%机械机能：标准商标/抗拉强度(Mpa)屈从强度(Mpa)伸长率(%)53109520G410~550≥ 245≥ 2425MnG≥ 415≥ 240≥ 2215MoG450~600≥ 270≥ 2215CrMoG440~640≥ 235≥ 2112Cr2MoG450~600≥ 280≥ 2012Cr1MoVG470~640≥ 255≥ 21化学成份：标准商标化学成分CSiMnPSCrMoCuNiGB531020G0.170.240.170.370.350.65≤0.030≤0.030//≤0.20≤0.25/20MnG0.170.240.170.370.701.00≤0.030≤0.030//≤0.20≤0.25/15MoG0.120.180.170.370.400.80≤0.030≤0.030/0.250.35≤0.20≤0.30/15CrMoG0.120.180.170.370.400.70≤0.030≤0.0300.801.100.400.55≤0.20≤0.30/12Cr2MoG0.080.15≤0.500.400.70≤0.030≤0.0302.002.500.901.20≤0.20≤0.30/12Cr1MoVG0.080.150.170.370.400.70≤0.030≤0.0300.901.200.250.35≤0.20≤0.300.150.35