| 简介 |
A spring steel according to the present embodiment has a chemical composition consisting of, in mass%, C : 0.4 to 0.7%, Si : 1.1 to 3.0%, Mn : 0.3 to 1.5%, P : equal to or less than 0.03%, S : equal to or less than 0.05%, Al : 0.01 to 0.05%, rare earth metal : 0.0001 to 0.002%, N : equal to or less than 0.015%, O : equal to or less than 0.0030%, Ti : 0.02 to 0.1%, and as optional elements, Ca, Cr, Mo, W, V, Nb, Ni, Cu, and B, with the balance being Fe and impurities. In the spring steel, the number of oxide inclusions having an equivalent circular diameter of equal to or greater than 5 µm is equal to or less than 0.2/mm2, the oxide inclusions each being one of an Al-based oxide, a complex oxide containing REM, O and Al, and a complex oxysulfide containing REM, O, S, and Al. Further, a maximum value among equivalent circular diameters of the oxide inclusions is equal to or less than 40 µm. |
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