| abstract |
(57) [Abstract] [PROBLEMS] Steel for manufacturing separable machine parts; The parts obtained from it. SOLUTION: 0.25 ≤ C ≤ 0.75, 0.2 ≤ Si ≤ 1.5, 0.1 ≦ Mn ≦ 2, 0 ≦ Ni ≦ 1, 0 ≦ Cr ≦ 1, 0 ≦ Mo ≦ 1, 0 ≦ Cu≤1, 0≤V≤0.2, 0.02≤S≤0.35, 0.04≤P≤0. 2, 0 ≤ Al ≤ 0.005, 0.005 ≤ N ≤ 0.02, and if necessary, 0.1% or less of at least one element selected from lead, tellurium and selenium, with the balance being iron and smelting. A steel having a chemical composition (% by weight) that is an impurity, and further treated with calcium, and the use thereof. |