| 摘要 |
PURPOSE:To improve the resistance of a Cr stainless steel pipe for an oil well to stress corrosion cracking by heat treating the pipe under specified conditions. CONSTITUTION:A pipe for an oil well for collecting petroleum or gas is made of a Cr stainless steel contg. 0.03-0.3% C, 0.1-0.4% Si, 0.4-1.2% Mn, 0.2-2.5% Ni, 9-18% Cr, 0.05-2% Mo, <0.035% P and <0.02% S. The resulting stainless steel pipe is heated to 850-950 deg.C soln. heat treatment temp., cooled at 20-1 deg.C/ sec cooling rate, and tempered at 550-750 deg.C to manufacture a pipe for an oil well causing hardly stress corrosion cracking due to CO2 and H2S contained in petroleum or gas. |
