| 摘要 |
PURPOSE:To obtain a high Mn steel for a nonmagnetic drill collar with high strength, superior ductility and toughness by adding specified percentages of C, Si, Mn, S and V to Fe. CONSTITUTION:A high Mn steel consisting of, by weight, 0.01-0.50% C, <=3.0% Si, 18-35% Mn, <=0.20% S, 0.60-3.0% V and the balance Fe with inevitable impurities is prepd. To the steel may be added one or more among 0.5-7.0% Cr, 0.1-7.0% Ni, and 0.1-3.0% Cu and/or one or more among 0.01-1.50% each of Nb, Ti and Al and 0.05-3.0% each of Mo, W and Co. The high Mn steel has superior resistance to stress corrosion cracking and superior machinability besides said properties.
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