| 摘要 |
A heat-resistant steel contains 0.1-3 mass% of Cr and satisfies the following equation:0.1 .ltoreq. Nb + Mo + V and MX-type complex precipitates formed inside microcrystalline grains contain 30 mass% or more of Mo and 7 massy or more of Nb. Also provided is a process for producing the alloy steel product involving casting, forging, hot rolling, normalizing, optionally direct quenching, cooling at a predetermined cooling rate, and tempering.
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