The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 23, 1993
Filed:
Jan. 27, 1992
Applicant:
Inventors:
Assignee:
ITW-ATECO GmbH, Norderstedt, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C21D / ;
U.S. Cl.
CPC ...
148530 ; 148518 ; 148529 ;
Abstract
The invention relates to a method for making workpieces of ferritic steel, such as drilling screws wherein the workpiece is made of a transformable chrome steel having a chrome percentage of at least 13%, whereupon a workpiece receives a coating from nickel or a nickel or cobald alloy having a thickness of at least 5 .mu.m, and subsequently the workpiece is heat treated under oxygen free environment at at least 850.degree. C. so as to obtain a desired hardness and corrosion resistance.