Means for predicting preformance of stainless steel alloy for use with surgical needles

US5651843A · kind A · utility

Assignee

• Ethicon, Inc. · US

Inventors

• Lee P. Bendel · Lebanon, US
• Timothy Sardelis · Somerville, US
• Lawrence P. Trozzo · Somerville, US
• Leon K. Stungurys · Roanoke, US
• Hugo R. Florez · Somerville, US
• Jeffrey T. Lavin · Milford, US
• Matthew J. McGrane · Three Bridges, US
• Jeffrey K. McVey · Lambertville, US

Key dates

• Filing date: May 29, 1996
• Grant date: Jul 29, 1997
• Expiry date: May 29, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22C38/50
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A new and useful predictor for maraging stainless steel alloys is created, called the martensite finish temperature, M.sub.f (.degree. F.). This formula enables one to predict the temperature at which a steel is entirely converted to martensite, and is described as M.sub.f =1027--78% Ni--27% Ti--34% Mo. A desirable needle alloy for this amount is nickel at 10%, molybdenum at about 2.7%, and titanium at about 2%.