Prealloy powder for powder metallurgy, a sintered part using the same, and a manufacturing method thereof

A sintered part manufactured by powder metallurgy, the sintered part comprising:

• 1.05 to 1.55 wt % of Cr;
• 0.3 to 0.5 wt %;
• of Mo;
• 0.5 to 0.7 wt % of C;
• and
• a remaining of Fe and impurities.

A method of manufacturing a sintered part by powder metallurgy, the method comprising:

• preparing a prealloy powder comprising 1.05 to 1.55 wt % of Cr, 0.3 to 0.5 wt % of Mo, a remaining of Fe and impurities;
• preparing a mixed powder by mixing the prepared prealloy powder with a carbon powder and a lubricant;
• forming the prepared mixed powder to prepare a formed body;
• sintering the prepared formed body;
• post-processing a sintered part of the formed body sintered;
• and
• ion nitriding the post-processed sintered part.