Title: Method for making fasteners

Abstract: A method for making a fastener having a head and a shank from a slug consisting essentially of an AISI 200 or 300 series stainless steel having an Md₃₀ temperature in the range of about minus 50° C. to about 50° C. comprising the following steps:

(a) cooling the slug to a temperature at least about 50° C. below the Md₃₀ temperature of the stainless steel minus 30° C.

(b) extruding a portion of the cooled slug to provide the shank while simultaneously heating the remaining portion of the cooled slug to a temperature in the range of about Md₃₀ minus 30° C. to about 500° C.; and

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Inventors: Van, Den Sype Jaak S. (Scarsdale, NY)

Application Number: 06/093015
Filing Date: 1979-11-09
Publication_date: 1981-08-04
Assignee: UNION CARBIDE CORP

Primary Class(es): 470/16 470/32, 148/622, 470/31, 470/17, 148/578
Other Classes: C21D7/10; C21D8/00; C21D7/00; B21K1/46
US Patent Ref:

1029395	June, 1912	Muller
1554336	September, 1925	De Lapotterie
2027980	January, 1936	Horton	10/27E
2032586	March, 1936	Lindquist
2113172	April, 1938	Cordes	10/27E
3871925	March, 1975	Nunes	148/12.4
4042421	August, 1977	Van den Sype et al.	148/12.4
4042423	August, 1977	Van den Sype et al.	148/12.4
4161415	July, 1979	Van den Sype et al.	148/12.4

Other Refs: JP4627138

June, 1967

148/12.4

Primary Examiner: Mcquade, John
Assistant Examiner:
Attorney: Bresch, Saul R.

Claims:

I claim: