Steel for machine structural use and method of producing same

Details Steel for machine structural use and method of producing same Steel for machine structural use and method of producing same

2005-01-04

2005-01-04

Yee, Deborah (Department: 1742)

Alloys or metallic compositions

Ferrous

Lead, bismuth, selenium, tellurium or calcium containing

C420S087000

Reexamination Certificate

active

06838048

ABSTRACT:
A steel for machine structural use which comprises, on the percent by mass basis, C: 0.1 to 0.6%, Si: 0.01 to 2.0%, Mn: 0.2 to 2.0%, S: 0.005 to 0.20%, P: not more than 0.1%, Ca: 0.0001 to 0.01%, N: 0.001 to 0.02% and Al: not more than 0.1%, with the balance being Fe and impurities, with a value of [Ca]e defined by [Ca]e=T.[Ca]−(T.[O]/(O)ox)×(Ca)oxof not more than 5 ppm or with a proportion of MnO contained in oxide inclusions of not more than 0.05 and a value of Ca/O of not more than 0.8 is excellent in machinability and, therefore, it can be used as a steel stock for various machine structural steel parts, such as in industrial machinery, construction machinery and conveying machinery such as automobiles. It is substantially free of Pb, hence suited for use as a steel friendly to the global environment. [Ca]e is the effective Ca concentration index (ppm by mass), T.[Ca] and T.[O] are the contents of Ca and O, respectively, in ppm by mass, and (O)oxand (Ca)oxare the proportions of O and Ca contained in oxide inclusion, respectively.

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Denki-Seiko (Electric Furnace Steel), vol. 44, No. 1, pp. 81-88, Jan. 1973.

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