| 摘要 |
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 Y P AND THE TONE VALUE XP AT WHICH YP IS COUNTED SATISFIES AN INEQUALITY, 800XP- YP-27000 > O. THIS STEEL PRODUCT IS SUPERIOR IN WEATHERABILITY UNDER ATMOSPHERIC ENVIRONMENTS, AND ALSO SUPERIOR IN SULFIDE STRESS CRACKING RESISTANCE UNDER ENVIRONMENTS CONTAINING HYDRO-SULFIDE.
|
