| 摘要 |
<p>Martensitic stainless steel for oil well has 0.08 to 0.25 wt.% C, 14 to 16 wt.% Cr, 1.0 wt.% or less Si, 2.0 wt.% or less Mn, 0.5 to 3.0 wt.% Ni, 0.03 to 0.10 wt.% N, 0.04 wt.% or less P, 0.01 wt.% or less S, 0.1 to 1.0 wt.% Mo, the balance being Fe and inevitable impurities, said Cr, C, Ni and N being in amount such that Cr - 12C + 0.75 Ni + 1ON >/= 13 wt.%, and said martensitic stainless steel having delta -ferrite of 10% or less. The martensitic stainless steel can contain at least one of 0.05 to 0.30 wt.% V and 0.01 to 0.1 wt.% Nb. Also the martensitic stainless steel can contain 0.5 to 3.0 wt.% Cu. Further the martensitic stainless steel can contain 0.5 to 3.0 wt.% Cu, and at least one of 0.05 to 3.0 wt.% V and 0.01 to 0.1 wt.%. Nb. <IMAGE></p> |
