AUSTENITIC HEAT-RESISTANT ALLOY AND METHOD FOR PRODUCING SAME

Title:

AUSTENITIC HEAT-RESISTANT ALLOY AND METHOD FOR PRODUCING SAME

Document Type and Number:

WIPO Patent Application WO/2018/146783

Kind Code:

A1

Abstract:

Provided is an austenitic heat resistant alloy containing, in mass%, 0.02-0.12% of C, at most 2.0% of Si, at most 3.0% of Mn, at most 0.030% of P, at most 0.015% of S, at least 20.0% and less than 28.0% of Cr, more than 35.0% and at most 55.0% of Ni, 0-20% of Co, 4.0-10.0% of W, 0.01-0.50% of Ti, 0.01-1.0% of Nb, less than 0.50% of Mo, less than 0.50% of Cu, at most 0.30% of Al, less than 0.10% of N, 0-0.05% of Mg, 0-0.05% of Ca, 0-0.50% of REM, 0-1.5% of V, 0-0.1% of B, 0-0.10% of Zr, 0-1.0% of Hf, 0-8.0% of Ta, and 0-8.0% of Re, with the remainder comprising Fe and inevitable impurities, wherein, in a cross section perpendicular to the longitudinal direction of the alloy, the shortest distance from the center to the outer surface portion is 40 mm or more, the austenite grain size number of the outer surface portion is -2.0 to 4.0, the amount of Cr present as a precipitate satisfies [CrPB/CrP S≤10.0], and [YSS/YSB≤1.5] and [TSS/TSB≤1.2] are satisfied at room temperature.

Inventors:

SEMBA HIROYUKI (JP)
OKADA HIROKAZU (JP)
YOSHIZAWA MITSURU (JP)
ONO TOSHIHIDE (JP)

Application Number:

PCT/JP2017/004824

Publication Date:

August 16, 2018

Filing Date:

February 09, 2017

Export Citation:

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Assignee:

NIPPON STEEL & SUMITOMO METAL CORP (JP)

International Classes:

C22C19/05; C21D8/00; C22C38/00; C22C38/58; C22F1/10

Foreign References:

JP2011063838A	2011-03-31
JP2004003000A	2004-01-08
JP2016037664A	2016-03-22
JPS61179833A	1986-08-12
JPS61179834A	1986-08-12
JPS61179835A	1986-08-12
JPS61179836A	1986-08-12
JP2004003000A	2004-01-08

Other References: