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A heat-resistant alloy and quality technology, applied in the field of Ni-based heat-resistant alloys, can solve the problems of insufficient creep rupture strength of Fe-based alloys, and achieve the improvement of zero ductility temperature and hot workability, ductility and toughness improvement, high intensifying effect
Inactive Publication Date: 2011-08-31
NIPPON STEEL CORP
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[0005] Fe-based alloys such as austenitic stainless steels have insufficient creep rupture strength for the above-mentioned severe requirements
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[0169] Austenitic alloys 1 to 15 and A to N having the chemical compositions shown in Table 1 and Table 2 were melted using a high-frequency vacuum melting furnace to obtain 30 kg ingots.
[0170] Alloys 1 to 15 in Table 1 and Table 2 are alloys whose chemical compositions are within the range specified by the present invention. On the other hand, alloys A to N are alloys of comparative examples whose chemical compositions deviate from the conditions specified in the present invention. In addition, both alloy F and alloy G are alloys in which the respective contents of Nd and B are within the ranges specified in the present invention, but the value of [Nd+13.4×B] does not satisfy the aforementioned formula (1). In addition, the alloy M is an alloy in which the respective contents of Sn and Pb are within the ranges specified in the present invention, but the value of [Sn+Pb] does not satisfy the aforementioned formula (2). Alloy N is an alloy in which the respective contents o...
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Abstract
Disclosed is a Ni-based heat-resistant alloy that contains C <= 0.1%, Si <= 1%, Mn <= 1%, Cr more than 15% and less than 28%, Fe <= 15%, W more than 5% to 20%, Al more than 0.5% to 2%, Ti more than 0.5% to 2%, Nd 0.001% to 0.1%, B 0.0005% to 0.01%, and the remainder comprising Ni and impurities, wherein the impurities P, S, Sn, Pb, Sb, Zn and As are such that P <= 0.03%, S <= 0.01%, Sn <= 0.020%,Pb <= 0.010%, Sb <= 0.005%, Zn <= 0.005%, and As <= 0.005%, and in addition, satisfy the three equations [0.015 <= Nd + 13.4*B <= 0.13], [Sn + Pb <= 0.025] and [Sb + Zn + As <= 0.010]. With the alloy, an even higher level of strength than with conventional Ni-based heat-resistant alloys can be achieved, while the ductility and toughness after long-term use at high temperature are significantly improved, and the zero ductility temperature and hot processing characteristics are even further improved. Thus, the alloy can be favorably used as a pipe material, a thick sheet for heat-resistant and compression-resistant members, a rod material, and cast articles such as in power generating boilers or industrial chemical plants. The alloy could also contain a specified quantity of at least one ofMo, Co, Nb, V, Zr, Hf, Mg, Ca, Y, La, Ce, Ta or Re.
Description
technical field [0001] The invention relates to a Ni-based heat-resistant alloy. Specifically, it relates to a high-strength Ni-based heat-resistant alloy excellent in hot workability and ductility and toughness after long-term use, and the Ni-based heat-resistant alloy can be used as a pipe material, a Thick plates, rods, forgings, etc. of heat-resistant and pressure-resistant parts. Background technique [0002] In recent years, ultra-supercritical pressure boilers in which the temperature and pressure of steam have been increased to improve efficiency are being newly built in the world. Specifically, it is planned to increase the steam temperature, which has been around 600°C until now, to 650°C or higher, and furthermore, 700°C or higher. This is based on the following factors: energy saving and efficient use of resources, and CO 2 Reduction of gas emissions has become one of the unresolved issues of energy issues and has become an important industrial policy. And th...
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