The super hot hot forging non quality check part and its production mannered null mass whose for the connecting rod break separation

摘要

PROBLEM TO BE SOLVED: To provide a hot-forged component having stable and superior rupture-separability secured even in consideration of fluctuation when being manufactured.;SOLUTION: This component comprises, by wt.%, 0.20-0.60% C, 0.10-2.50% Si, 0.30-2.00% Mn, 0.01-0.20% P, 0.05-2.00% Cr, 0.060% or less Al, 0.01-0.50% V, 0.003-0.020% N, one or more elements from among 0.04-0.20% S, 0.30% or less Pb, 0.30% or less Te, 0.01% or less Ca, 0.30% or less Bi, 0.01% or less Mg and 0.01% or less Zr, as needed, and the balance Fe with impurity elements; has the structure of ferrite-pearlite; and contains austenitic grains having an average grain size number of 2.5 or less.;COPYRIGHT: (C)2005,JPO&NCIPI