Steel wire and spring

Number of patents in Portfolio can not be more than 2000

United States of America

PATENT NO 12091734
APP PUB NO 20220307115A1
SERIAL NO

17048051

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Abstract

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A steel wire is formed of a steel containing: not less than 0.6 mass % and not more than 0.7 mass % carbon, not less than 1.2 mass % and not more than 2.1 mass % silicon, not less than 0.2 mass % and not more than 0.6 mass % manganese, not less than 1.4 mass % and not more than 2 mass % chromium, and not less than 0.15 mass % and not more than 0.3 mass % vanadium, with the balance being iron and unavoidable impurities. The steel includes a matrix made up of tempered martensite, and a non-metallic inclusion present in the matrix. When √area of the non-metallic inclusion is represented as H1 and √area of a region including both the non-metallic inclusion and a decreased-hardness portion is represented as H2, a ratio of H2 to H1, or, H2/H1 is at least 1 and less than 1.3.

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Patent Owner(s)

Patent OwnerAddress
SUMITOMO ELECTRIC INDUSTRIES LTD5-33 KITAHAMA 4-CHOME CHUO-KU OSAKA-SHI OSAKA 541-0041

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Iwamoto, Katsutoshi Osaka, JP 4 8
Izumida, Hiromu Osaka, JP 20 83
Nakajima, Tetsuya Osaka, JP 40 451
Okada, Fuminori Osaka, JP 11 8
Sugimura, Kazuaki Osaka, JP 9 42

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