Claims
- 1. In a free machining cast steel shape consisting essentially of, in wt.%,
- ______________________________________carbon 0.06 to 1.0manganese 0.3-1.6silicon 0.30 max.sulfur 0.03-0.50phosphorous 0.12 max.bismuth 0.05-0.40iron essentially the balance,______________________________________
- the improvement wherein:
- the total amount of ingredients which lower the wetting ability of bismuth is less than the bismuth content of said steel.
- 2. In a free machining cast steel shape as recited in claim 1 wherein:
- said ingredients which lower the wetting ability of bismuth are copper, tin, zinc and nickel.
- 3. In a free machining cast steel shape as recited in claim 1 wherein said steel further comprises up to 0.3 wt.% lead and up to 0.06 wt.% tellurium.
- 4. In a free machining cast steel shape as recited in claim 1 wherein said steel includes at least 0.015 wt.% tellurium to enhance the wetting ability of said bismuth.
- 5. In a free machining cast steel shape as recited in claim 1 wherein the manganese content is greater than three times the sulfur content.
RELATED APPLICATION
This is a continuation-in-part of application Ser. No. 5965 filed Jan. 24, 1979 and entitled "Semi-Finished Steel Article and Method For Producing Same."
US Referenced Citations (9)
Foreign Referenced Citations (2)
Number |
Date |
Country |
47-206 |
Nov 1972 |
JPX |
1020535 |
Feb 1966 |
GBX |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
5965 |
Jan 1979 |
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