Industrial trial manufacture of 55SiCrNb steel for ultra high strength suspension spring

doi:10.13251/j.issn.0254-6051.2022.09.036

Abstract

Abstract: Continuous cooling transformation behavior of the supercooled austenite test 55SiCrNb steel was studied, and the effect of cooling rate on microstructure was clarified, and wire with a diameter of 16 mm was hot rolled via industrial production line. A strong steel wire with a diameter of 14.8 mm was fabricated through drawing and on-line induction heat treatment. The microstructure of steel wire consists of tempered troostite, a few tempered martensite and retained austenite, and exhibits tensile strength higher than 2160 MPa, and reduction of area larger than 44%, which is qualified for making springs with a strength level of 2100 MPa.

Key words: suspension spring steel, tempered troostite, tensile strength, percentage reduction of area

CLC Number:

TG142.4

Chen Huande, Ma Han, Sun Guocai, Zhang Yu. Industrial trial manufacture of 55SiCrNb steel for ultra high strength suspension spring[J]. Heat Treatment of Metals, 2022, 47(9): 208-213.

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