Process for manufacturing alloy steel wires having low relaxation characteristics

Abstract

Abstract A PROCESS FOR MANUFACTURING LOW-ALLOY STEEL WIRES HAVING LOW RELAXATION CHARACTERISTICS AT ROOM AND ELEVATED TEMPERATURES CHAACTERIZED BY HEATING A STARTING WIRE MATERIAL MADE OF LOW ALLOY STEEL CONTAINING, AS THE ALLOYING EYEMENT(S), EITHER SLICON ALONE OR A COMBINATION OF SILICON WITH AT LEAST ONE OTHER ELEMENT SUCH AS CHROMIUM, TO A TEMPERATURE ABOVE ITS A3 TRANSFORMATION POINT; EITHER COOLING THE HEATED WIRE MATERIAL AT A SPECIFIC COOLING RATE TO A TEMPERATURE JUST ABOVE ITS MS POINT BY MEANS OF NATURAL OR FORCED AIR COOLED AND REHEATING THE COOLED WIRE MATERIAL, WHEN THE MATERIAL IS SUCH THAT THE SPECIFIC COOLING RATE CAN BE EQUAL TO OR HIGHER THAN THE LOWER CRITICAL COOLING RATE OF THE MATERIAL, OR COOLING THE HEATED WIRE MATERIAL BY PASSING IT THROUGH A BATH OF MOLTEN LEAD OR SALT AT A TEMPERATURE OF 450-650*C. WHEN THE MATERIAL IS SUCH THAT ITS AIR COOLING RATE IA LOWER THAN ITS LOWER CRITICAL COOLING RATE, IN ORDER TO OBTAIN A WIRE MATERIAL HAVING A HIGHLY COLD-WORKABLE SORBITIC STRUCTURE AND HIGH TENSILE STENGTH; AND DRAW WORKING THE THUSOBTAINED WIRE MATERIAL AN THEN ARTIFICIALLY AGING THE DRAW WORKED WIRE MATERIAL TO MANUFACTURE THE DESIRED LOW-ALLOY STEEL WIRES. D R A W I N G

Inventors

• 👤 Kazuo Okamoto
• 👤 Naoki Eguchi
• 👤 Nasuo Sakao
• 👤 Ichiro Honda
• 👤 Eizo Suzuki

Bibliographic Details