STAINLESS STEEL FOR STRAIN DETECTION SENSOR SUBSTRATE

摘要

PROBLEM TO BE SOLVED: To provide a steel for a strain detection sensor in which the increase of strength is attained by a means which does not check its adhesion with a glass based material and toughness.;SOLUTION: When the stainless steel is subjected to heat treatment so as to be heated at 700 to 1,000°C and to be cooled to a room temperature, martensite transformation occurs in the range from 200°C to a room temperature; wherein its linear expansion strain in the range from 200°C to a room temperature reaches ≤0.5%, and, after the heat treatment, the stainless steel has the properties of exhibiting a ferrite+martensite two phase structure. As the preferable composition, the one comprising, by mass, ≤0.15% C, ≤2.0% Si, ≤3.0% Mn, ≤0.10% P, ≤0.03% S, 0.6 to 5.0% Ni, 14 to 20% Cr and ≤0.10% N, and in which G value defined by formula (1) is 60 to 90 can be cited; wherein the formula (1) is G=420C+470N+11.5(Cr+Si)+23Ni+7Mn+189.;COPYRIGHT: (C)2007,JPO&INPIT