Spring steel of high strength and high corrosion resistance

Details Spring steel of high strength and high corrosion resistance Spring steel of high strength and high corrosion resistance

C - Chemistry, Metallurgy

22

C

C22C 38/44 (2006.01) C21D 8/06 (2006.01) C22C 38/02 (2006.01) C22C 38/18 (2006.01) C22C 38/20 (2006.01) C22C 38/22 (2006.01) C22C 38/40 (2006.01) C22C 38/46 (2006.01) C21D 9/02 (2006.01)

Patent

CA 2135035

Disclosed is a spring steel for a high corrosion resistant and high strength, which exhibits an excellent drawability without softening heat treatment after hot rolling, and which has a strength of 1900 MPa or more by quenching and tempering and an excellent corrosion resistance. The spring steel contains elements of C, Si, Mn and Cr, and elements of Ni and/or Mo in suitable amounts, the balance being essentially Fe and inevitable impurities, wherein the elements satisfy the following requirement: 2.5 ~ (FP) ~ 4.5 2.0 ~ (FP/log D) ~ 4.0 where D is a diameter (mm) of the rolled material, and FP = (0.23[C]+0.1)x(0.7[Si]+1)x(3.5[Mn]+1) x(2.2[Cr]+1)x(0.4[Ni]+1)X(3[Mo]+1) in which [element] represents mass % of the element.

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