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An austenitic and stainless steel technology, which is applied in the field of high-strength austenitic stainless steel and heat-resistant steel, can solve problems such as cracks
Active Publication Date: 2010-07-21
NIPPON STEEL CORP
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Problems solved by technology
[0008] In addition, the above-mentioned austenitic heat-resistant stainless steel is generally used in a high-temperature environment after being assembled by welding, but there is a problem that the welding heat-affected zone (hereinafter referred to as "heat-affected zone") may be damaged after long-term use in a high-temperature environment. HAZ") the problem of cracks
Method used
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Embodiment 1
[0153] The austenitic stainless steels having the chemical compositions shown in Table 1 and Table 2, namely steel A1, steel A2, steel B1, and steel B2 were melted in an electric furnace, and formed by hot forging and hot rolling. Then, it is heated to 1200°C and water-cooled heat treatment is performed, and then a steel plate with a thickness of 20 mm, a width of 50 mm, and a length of 100 mm is produced by machining.
[0154] In addition, steel A1 and steel A2 in Table 1 and Table 2 are steels whose chemical composition falls within the range specified by the present invention. On the other hand, steel B1 and steel B2 are steels of comparative examples in which the values of parameters P1 and P2 are outside the conditions specified in the present invention.
[0155]
[0156]
[0157] Then, a V-shaped groove with an angle of 30° and a weld root thickness of 1mm was processed along the length direction of the steel plate of steel A1, steel A2, steel B1, and steel B2, and then JIS...
Embodiment 2
[0168] The austenitic stainless steels having the chemical compositions shown in Table 4 and Table 5, namely steels A3 to A13, steel B3, and steel B4 were melted in an electric furnace, and formed by hot forging and hot rolling. Then, it is heated to 1200°C and water-cooled heat treatment is performed, and then a steel plate with a thickness of 20 mm, a width of 50 mm, and a length of 100 mm is produced by machining.
[0169] In addition, the steels A3 to A13 in Tables 4 and 5 are steels with chemical compositions within the range specified by the present invention. On the other hand, steel B3 and steel B4 are steels of comparative examples in which the value of parameter P2 is outside the range specified by the present invention.
[0170]
[0171]
[0172] A sample of 12mm×12mm×100mm is selected from the central part of the steel plate with a thickness of 20mm, a width of 50mm, and a length of 100mm prepared as described above, and the sample is subjected to a HAZ simulation therm...
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Abstract
Disclosed is an austenitic stainless steel which comprises the following components: C: 0.04-0.18%, Si: 1.5% or less, Mn: 2.0% or less, Ni: 6-30%, Cr: 15-30%, N: 0.03-0.35%, and sol.Al: 0.03% or less, and which further comprises at least one component selected from 1.0% or less of Nb, 0.5% or less of V and 0.5% or less of Ti, with the remainder being Fe and impurities, wherein the impurities contain the following components: P: 0.04% or less, S: 0.03% or less, Sn: 0.1% or less, As: 0.01% or less, Zn: 0.01% or less, Pb: 0.01% or less and Sb: 0.01% or less, and wherein the following formulae are fulfilled: P1 = S+[(P+Sn) / 2]+[(As+Zn+Pb+Sb) / 5] = 0.06; and 0.2 = Nb+2(V+Ti) = 1.7-10xP1. The austenitic stainless steel has high strength and, when used in a welded part, can exhibit excellent embrittlement crack resistance during being used at a high temperature. The steel is suitable as a material for an instrument that is intended to be used at a high temperature for a long period, such as a boiler for power generation.
Description
Technical field [0001] The present invention relates to an austenitic stainless steel, and in particular to a high-strength austenitic stainless steel that can be used in high-temperature equipment such as boilers for power generation and has excellent resistance to embrittlement and cracking at the welded portion during high-temperature use. The system is stainless heat-resistant steel. Background technique [0002] In recent years, from the viewpoint of reducing the environmental load, the idea of enabling boilers for power generation to be operated under high temperature and high pressure conditions has been promoted throughout the world, and there has been a demand for superheater tubes and reheater tubes. The austenitic heat-resistant steel of the material has more excellent high-temperature strength. [0003] On the basis of this technical background, various austenitic stainless steels have been disclosed. [0004] For example, Patent Document 1 discloses a method of setti...
Claims
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