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LOW-THERMAL-EXPANSION NI-BASED SUPER-HEAT-RESISTANT ALLOY FOR BOILER AND HAVING EXCELLENT HIGH-TEMPERATURE STRENGTH, AND BOILER COMPONENT AND BOILER COMPONENT PRODUCTION METHOD USING THE SAME
LOW-THERMAL-EXPANSION NI-BASED SUPER-HEAT-RESISTANT ALLOY FOR BOILER AND HAVING EXCELLENT HIGH-TEMPERATURE STRENGTH, AND BOILER COMPONENT AND BOILER COMPONENT PRODUCTION METHOD USING THE SAME
Disclosed is a low-thermal-expansion Ni-based super-heat-resistant alloy for a boiler, which has excellent high-temperature strength. The alloy can be welded without the need of carrying out any aging treatment. The alloy has a Vickers hardness value of 240 or less. The alloy comprises (by mass) C in an amount of 0.2% or less, Si in an amount of 0.5% or less, Mn in an amount of 0.5% or less, Cr in an amount of 10 to 24%, one or both of Mo and W in such an amount satisfying the following formula: Mo+0.5 W=5 to 17%, Al in an amount of 0.5 to 2.0%, Ti in an amount of 1.0 to 3.0%, Fe in an amount of 10% or less, and one or both of B and Zr in an amount of 0.02% or less (excluding 0%) for B and in an amount of 0.2% or less (excluding 0%) for Zr, with the remainder being 48 to 78% of Ni and unavoidable impurities.
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机译:公开了一种具有优异的高温强度的用于锅炉的低热膨胀Ni基超耐热合金。无需进行任何时效处理即可焊接该合金。该合金的维氏硬度值为240或更小。合金包含(按质量计)C含量为0.2%或更少,Si含量为0.5%或更少,Mn含量为0.5%或更少,Cr含量为10%至24%或两者兼有Mo和W的含量满足以下公式:Mo + 0.5 W = 5至17%,Al含量为0.5至2.0%,Ti含量为1.0至3.0%,Fe含量为10%或以下,以及B和Zr中的一个或两个,其中B的含量为0.02%或以下(不含0%),Zr的含量为0.2%或以下(不含0%),其余为48至78 Ni和不可避免的杂质的百分比。
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