| 摘要 |
PURPOSE: A process for preparing a spring having excellent fatigue life and permanent deformation resistance as well as a high stress of 130kg/mm¬2 by controlling the crystal particle size of austenite in steel comprising a spring alloy component system is provided, which reduces the cost of production. CONSTITUTION: The subject low alloy high stress spring is prepared by the characteristic process consisting of: hot rolling wire rods comprising by weight, C:0.4 to 0.6%, Si:2.8 to 4.0%, Mn:0.1 to 0.3%, Cr:0.3 to 0.6%, O:0.0015% or less, N:0.005 to 0.01%, P:0.01% or less, S:0.01% or less, one or two or more selected from Ni:0.1 to 0.3%, V:0.01 to 0.08%, Nb:0.01 to 0.08% and the balance of Fe with other inevitable impurities at 900 to 950deg.C for 10 to 15 min and quenching to be a grain size of 5 to 10 micrometer, tempering at 350 to 430deg.C to be an amount of retained austenite of 5 to 10%.
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