| 摘要 |
PURPOSE:To provide the titled high strength member having both of high strength and high toughness and low in magnetic permeability, obtained by applying hot processing respectively prescribed in a draft and a finish temp. to an Fe base alloy respectively containing C, Si, Mn, Ni, Cr, Mo and N in a predetermined ratio. CONSTITUTION:Steel containing, on a wt. basis, 0.15% or less C, 0.1-2.0% Si, 7.0-18.0% Mn, 0.5-6.0% Ni, 15.0-26.0% Cr, 0.5-4.0% Mo and 0.2-0.6% N and comprising the remainder of substantially Fe is prepared. Subsequently, hot processing is applied to said steel under such a condition that a draft is 50% or more and a finish temp. is 800-1,000 deg.C. Thus proof-stress at 0.2% is 80kg/mm.<2> or more, a Charpy impact value is 8kgm/cm<2> and magnetic permeability is 1.5% or less and optimum as a high strength member for machinery mounted to a submarine searching ship.
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