Steel excellent in forgeability and machinability

Details Steel excellent in forgeability and machinability Steel excellent in forgeability and machinability

2005-02-22

2005-02-22

Yee, Deborah (Department: 1742)

Metal treatment

Stock

Ferrous

C148S330000, C148S333000, C148S336000, C420S087000, C420S088000

Reexamination Certificate

active

06858101

ABSTRACT:
The present invention is a steel, excellent in machinability, wherein forging workability is improved by suppressing the deterioration of mechanical properties in the direction in which the mechanical properties are the lowest, and more specifically, is a steel excellent in forgeability and machinability, characterized in that: the steel contains, in mass, C: 0.1 to 0.85%, Si: 0.01 to 1.5%, Mn: 0.05 to 2.0%, P: 0.003 to 0.2%, S: 0.003 to 0.5%, and Zr: 0.0003 to 0.01%; the following steel components are controlled in the following ranges respectively, in mass, Al: 0.01% or less, total O: 0.02% or less, and total N: 0.02% or less; the average aspect ratio of MnS grains is 10 or less and the maximum aspect ratio of those is 30 or less; and the balance of the steel components consists of Fe and unavoidable impurities.

REFERENCES:
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