C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
C21D 7/06 (2006.01)
Patent
CA 2291857
A martensitic stainless steel product having a chromium content of 9 to 15 % by weight and a surface from which mill scales generated during production are removed by a shot blasting. The surface satisfies that, when a color image of the surface taken with 640 X 480 pixels is analyzed on blue color and a histogram of the pixel numbers and the tones divided into 0 to 255 classes is obtained, a relationship between the maximum frequency Yp and the tone value Xp at which Yp is counted satisfies an inequality, 800Xp - Yp - 27000 > 0. This steel product is superior in weatherability under atmospheric environments, and also superior in sulfide stress cracking resistance under environments containing hydro-sulfide.
Amaya Hisashi
Anraku Toshiro
Hidaka Yasuyoshi
Gowling Lafleur Henderson Llp
Sumitomo Metal Industries Ltd.
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