40Cr合金管知识化学成分
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。 40Cr合金管的弹性模量和切变模量 弹性模量E(20℃) /MPa 200000~211700 切变模量G(20℃) 80800 40Cr合金管的线(膨)胀系数温度/℃ 20~200 20~300 20~400 20~500 20~600 20~700 备注 线(膨)胀系数/C-1 (11.9~12.0) ×10-6 (13.3~13.4)×10-6 (14.3~14.4)×10-6 (15.0~15.1)×10-6 (15.3~15.4)×10-6 (15.4~15.5)×10-6 1 2 1 用钢成分(%):0.37C,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。 40Cr合金管的热导率 温度/℃ 100 200 300 400 500 600 热导率λ/W?(m?K)-1 32.6 30.9 29.3 28.0 26.7 25.5 40Cr合金管的热加工工艺 加热温度/℃ 开始温度/℃ 终止温度/℃ 冷却方法/℃ <1200 1100~1150 >800 大于60mm缓冷 40Cr合金管的晶粒长大倾向 加热温度/℃ 800 850 900 950 1000 1050 1100 1150 备注 晶粒度级别 8 8~7 8(930℃)