| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an alloy which has high tensile strength and high Charpy absorbed energy, and which is precipitation-strengthened martensitic steel.SOLUTION: There is provided the precipitation-strengthened martensitic steel containing, by mass%, C:0.02 to 0.08%, Al:0.05% or less, Cr:8.0 to 13.0%, Ni:2.0 to 8.0%, Co:2.0 to 16.0%, Mo and W: 3.5 to 8.0% in total in terms of Mo+0.5W where Mo is an essential element and a part thereof is substituted by W, and the balance Fe with inevitable impurities. The precipitation-strengthened martensitic steel may further contain, by mass%, Si:0.05% or less and Mn:0.05% or less. It is preferred that in the precipitation-strengthened martensitic steel, total sum of impurities Ti, V, Zr, Nb and Ta is restricted to 0.1 mass% or less.</p> |
