| 摘要 |
PURPOSE:To considerably improve the resistance to sulfide stress corrosion cracking by specifying the amounts of C, Si, Mn, P, S, Nb, Al, N, Ca and Fe. CONSTITUTION:A steel consisting of, by weight, 0.002-0.15% C, 0.05-0.8% Si, 0.5-2.2% Mn, <=0.025% P, <=0.004% S, 0.005-0.12% Nb, 0.01-0.08% Al, 0.006-0.02% N, 0.0005-0.008% Ca and the balance Fe is melted by heating to 1,000-1,300 deg.C and rolled at >=20% draft in a temp. zone under the recrystallization temp. and at 650-800 deg.C finish rolling temp.
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