Process for the manufacture of rods or machine wire of martensitic stainless steel and the products which are produced

US4594115A · kind A · utility

Assignee

• Ugine Aciers · FR

Inventors

• Michel Lacoude · Albertville, FR
• Michel Lluansi · Albertville, FR
• Philippe Munier · Ugine, FR

Key dates

• Filing date: Jul 1, 1985
• Grant date: Jun 10, 1986
• Expiry date: Jul 1, 2005

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22C38/18
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A process for the manufacture of martensitic stainless steel rods or machine wire, and the products thus obtained, by hot rolling, which steel comprises by % weight: PA0 C=0.015 to 0.090 PA0 N=0.015 to 0.080 with C+N=0.05 to 0.120 PA0 Cr=9.0 to 14.0 PA0 Nb=.ltoreq.0.1 PA0 V=.ltoreq.0.1 PA0 S=.ltoreq.0.35 PA0 Si=.ltoreq.1.0 PA0 Mn=.ltoreq.1.0 PA0 Ni=.ltoreq.2.0 PA0 Mo=.ltoreq.1.0 PA0 P=.ltoreq.0.040 PA0 Cu=.ltoreq.1.0 PA0 Fe and impurities=balance and having the following mechanical properties: R=900 to 1100 MPa; E 0.2=650 to 850 MPa; A.gtoreq.10%; and resilience KCU.gtoreq.40 J/cm.sup.2, and wherein the preheating or the end of the hot rough preliminary processing preceding the final hot rolling brings the products to a temperature between 1000.degree. C. and 1160.degree., and wherein the final hot rolling which is effected at a temperature below or equal to 1150.degree. C. produces a section reduction "S/s" which is at least equal to 3, and which reduction is followed by homogenous cooling and when S.ltoreq.0.08% the rods or machine wire have the following mechanical properties: R=900 to 1100 MPa; E 0.2=650 to 850 MPa; A=12 to 16%; resilience KCU=80 to 140 J/cm.sup.2, and the rods…