Carburized part and method for manufacturing same

A carburized part, a chemical composition in a region of a depth of 1.5 mm or more from a surface of the carburized part containing, by mass %,

• C:
• 0.10 to 0.40%,
• Si:
• 0.10 to 3.00%,
• Mn:
• 0.50 to 3.00%,
• Cr:
• 0.30 to 3.00%,
• Al:
• 0.010 to 0.050%,
• N:
• 0.003 to 0.030%,
• S:
• 0.003 to 0.030%,
• P:
• 0.030% or less,
• Mo:
• 0 to 3.00%,
• B:
• 0 to 0.0050%,
• Nb:
• 0 to 0.100%,
• Ti:
• 0 to 0.100%,
• V:
• 0 to 0.30%,
• Ni:
• 0 to 0.40%,
• In:
• 0 to 0.02%,
• Cu:
• 0 to 0.20%,
• Bi:
• 0 to 0.300%,
• Pb:
• 0 to 0.50%,
• REMs:
• 0 to 0.020% and
• a balance of Fe and impurities;
• a Vickers hardness at a depth of 1.5 mm from the surface being 200 to 400 HV;
• a content of C at a region of a depth down to 0.10 mm from the surface being, by mass %, 0.60 to 1.20%;
• a fraction of hardened structures of an area ratio being 99.00% or more;
• a grain boundary cementite fraction of an area ratio being 0.50% or less;
• a fraction of incompletely hardened structures of an area ratio being 0.50% or less.