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US 4,061,494 AGranted
Free-cutting graphitic steel
AssigneeNippon Steel Corporation
InventorsTakao Yokokawa, Shogo Kanazawa, Yasuo Otoguro, Nobukazu Suzuki, Sigeyuki Akase, Noboru Miida, Tadahisa Akazawa, Kazuya Kuroiwa
Life of this patent
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Abstract
A free cutting graphitic steel comprising: Si: from more than 1.5 to 2.3% Mn: 0.1 to 0.7% S: not more than 0.015% One or both Al and Ti: 0.015 to 0.1% in total Rare earth: 0.01 to 0.2% and Spheroidized graphite: 0.20 to 0.90% with the balance being iron and unavoidable impurities, Said spheroidized graphite being distributed at a ratio of more than particles 50/mm.sup.2.
Claims1
A free cutting graphitic steel consisting essentially of
- Si:
- from more than 1.5 to 2.3%
- Mn:
- 0.1 to 0.7%
- S:
- not more than 0.015% one or both Al and Ti in a total amount of:
- 0.015 to 0.1% rare earth:
- 0.01 to 0.2% and spheroidized graphite:
- 0.20 to 0.90% with the balance being iron and unavoidable impurities,
- said spheroidized graphite being distributed at a ratio of more than 50 graphites per mm.sup.2.
7 more elements
Dependencies are inferred from the claim text.