40Cr合金管的化学成分(GB/T3077-1999)
C Si Mn Cr S P Ni Cu
0.37~0.45 0.17~0.37 0.50~0.80 0.80~1.10 ≤0.030 ≤0.030 ≤0.25 ≤0.030
40Cr合金管的临界温度
临界点 Ac1 Ac3 Ms 备注
温度(近似值)/℃ 780
770 840
805 350
328 1
2
1 用钢成分(%):0.38C,0.30Si,0.66Mn,0.95Cr,0.18Ni,0.016P,0.028S;
2 用钢成分(%):0.42C,0.29Si,0.69Mn,0.87Cr,0.14Ni,0.010P,0.013S。
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