Razor blades and other thin cutting edge tools and method of manufacture of such tools

Abstract

Abstract A HOT ROLLED STEEL STRIP CONTAINING 14% CHROMIUM IS ANNEALED AT 825*C. FOR AT LEAST TWO HOURS AND THEN COOLED. THE ANNEALED STRIP IS THEN COLD ROLLED IN SEVERAL STEPS WITH INTERMEDIATE RECRYSTALLIZATION ANNEALINGS TO A THICKNESS OF ABOUT 0.2 MM. THEN THE STRIP IS AUSTENITIZED AT A TEMPERATURE OF 1140*C. FOR ABOUT 5 SECONDS AND THEN QUENCHED TO PRODUCE A MARTENSITE AND AUSTENITE MIXTURE WITH AN AUSTENITE CONTENT OF ABOUT 60%. THE STRIP IS THEN HEATED AT 710*C. FOR TWO HOURS PRODUCING A PRECIPITATION OF FINE CARBIDE GRAINS IN A MATRIX OF FERRITE. AFTER FURTHER COLD ROLLING WITH INTERMEDIATE RECRYSTALLIZATION ANNEALINGS TO THE FINAL THICKNESS OF 0.1 MM., THE STRIP IS HEATED TO A TEMPERATURE OF ABOUT 1100*C., QUENCHED TO -80*C., AND ANNEALED AT ABOUT 200*C.; AN EDGE OF THE STRIP IS GROUND TO PROVIDE A SHARPENED RAZOR EDGE; AND A LAYER TO IMPROVE THE SHAVING PROPERTIES IS APPLIED TO THE SHARPENED EDGE IN A PROCESS INVOLVING HEATING THE STEEL TO A TEMPERATURE BETWEEN 200 AND 400*C.

Inventors

• 👤 Jan-Christer Henric Ove Carlen
• 👤 Francis Edward Flaherty

Bibliographic Details