US 8,172,959 B2 · Austenitic stainless steel, manufacturing method for the same, and structure using the same

Austenitic stainless steel, manufacturing method for the same, and structure using the same

AssigneesMitsubishi Heavy Industries, Ltd., The Tokyo Electric Power Company, Incorporated

InventorsYasuhiro Sakaguchi, Toshihiko Iwamura, Hiroshi Kanasaki, Hidehito Mimaki, Masaki Taneike, Shunichi Suzuki, Kenrou Takamori, Suguru Ooki, Naoki Anahara, Naoki Hiranuma, Toshio Yonezawa

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Abstract

There are provided an austenitic stainless steel having high stress corrosion crack resistance, characterized by containing, in percent by weight, 0.030% or less C, 0.1% or less Si, 2.0% or less Mn, 0.03% or less P, 0.002% or less S, 11 to 26% Ni, 17 to 30% Cr, 3% or less Mo, and 0.01% or less N, the balance substantially being Fe and unavoidable impurities; a manufacturing method for an austenitic stainless steel, characterized in that a billet consisting of the said austenitic stainless steel is subjected to solution heat treatment at a temperature of 1000 to 1150° C.; and a pipe and a in-furnace structure for a nuclear reactor to which the said austenitic stainless steel is applied.

Claims11

Dependent claims

An austenitic stainless steel having high stress corrosion crack resistance, containing, in percent by weight,

0.030% or less C,
0.02% or less Si,
0.85% or less Mn,
0.03% or less P,
0.002% or less S,
11 to 20.1% Ni,
17 to 30% Cr,
1.03 to 3% Mo, and
0.003% or less N,
the balance substantially being Fe and unavoidable impurities, and
having stacking fault energy (SFE) calculated by the following equation (1):
SFE (mJ/m2)=25.7+6.2×Ni+410×C−0.9×Cr−77×N−13×Si−1.2×Mn (1)
that is 100 (mJ/m2) or higher.

10 more elements

Dependencies are inferred from the claim text.