| 摘要 |
PROBLEM TO BE SOLVED: To provide a ferrite pearlite type non-heat treated steel combining high mechanical strength with machinability, and furthermore excellent in producibility.SOLUTION: The ferrite pearlite type non-heat treated steel contains as essential additive elements, by mass%, C:0.20 to 0.60%, Si:0.20 to 2.00%, S:0.001 to 0.200%, Cr:0.40 to 2.00%, s-Al:0.010 to 0.050%, and contains as optional additional elements, by mass%, Mn:≤1.00%, P:≤0.200%, Cu:≤0.50%, Ni:≤0.50%, Mo:≤0.20%, V:≤0.50%, Ti:≤0.15% and N:≤0.030%, and the balance Fe with inevitable impurities and satisfies the predetermined relation in terms of mass% of each element of C, Si, Mn, P, Cu, Ni, Cr, Mo, V, Ti, N, S. |
