| 摘要 |
PROBLEM TO BE SOLVED: To provide high strength non-heat treated steel for fracture separation which has high strength, improved fracture separation property and minimal deformation due to fracture separation and further can provide the resultant fracture surfaces with proper irregularities. SOLUTION: The non-heat treated steel having a ferrite-pearlite structure and used for forged parts which can be obtained by being separated into two or more pieces by fracturing after hot forging has a composition consisting of, by weight, 0.2 to 0.6% C, 0.1 to 2% Si, 0.1 to 1.5% Mn, 0.03 to 0.2% S, 0.02 to 0.15% P, 0.03 to 1% Cu, 0.03 to 1% Ni, 0.05 to 1% Cr, 0.02 to 0.4% V, 0.01 to 0.8% Ti, 0.005 to 0.045% s-Al, 0.008 to 0.035% N and the balance Fe with inevitable impurities. COPYRIGHT: (C)2005,JPO&NCIPI
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