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CHEMICAL COMPOSITION
C: 0.32%-0.42%
Si: 0.8% - 1.2%
Mn: ≤0.50%
Cr: 4.50% - 5.50%
Mo: 1.00%-1.50%
V: 0.8%-1.2%
S: ≤0.03%
P: ≤0.03%
MECHANICAL PROPERTIES
Hardness:
Before heat treatment, it is about HRC15~20 (HB200~230)
After heat treatment, the internal HRC is approximately 40°~45°, and the surface HV1000±100
Tensile strength: 1100-1300MPa
Yield strength: 900-1100MPa
Elongation: 12-20%
PHYSICAL PROPERTIES
Density: 7.85g/cm³
Thermal expansion coefficient: 11.8×10^-6/℃
Thermal conductivity: 41.9W/(m·K)
Wear resistance: After heat treatment, 52-54HRC, excellent wear resistance
Polishing performance: The grains of SKD61 material are small and uniform, which can produce a smoother surface and good surface finish.
HEAT TREATMENT
Quenching:
First stage preheating: 500-550℃
Second stage preheating: 750-800 ℃
Blow air cooling or high pressure gas cooling, etc., into the tempering furnace at 100-150℃.
Tempering:
Preheating: 300-350℃
Tempering Heating: 550-680℃
The air is cooled to room temperature and tempered three times. Quenching temperature 1000 ~ 1050 degrees, hardness 50 ~ 55HRC, heat treatment deformation is small, the surface can be nitrided, so that the processed products have better wear resistance.
Cryogenic treatment:
In order to obtain the highest hardness and dimensional stability, the die is cryogenically cooled immediately after quenching to – 70 – 80℃ for 3 – 4 hours, and then tempered. The hardness of the cryogenically treated tool or die is 1 – 3 HRC higher than that of the conventional heat treatment. For parts with complex shape and large size change, cryogenic treatment is dangerous to crack in production.
Nitriding treatment:
After nitriding, a hardened layer with high hardness and corrosion resistance is formed on the surface of the die or workpiece.
FORGING
For forging SKD61 tool steel, first slowly Preheat to 750°C(1382°F), soak enough time, then rapidly heat to 1050-1100 °C(1922-2030°F). then start forging, ensure the forging temperature higher than 850°C(1562°F). Cool SKD61 tool steel must be slowly after H13 steel forging finished.
CHEMICAL COMPOSITION
C: 0.32%-0.42%
Si: 0.8% - 1.2%
Mn: ≤0.50%
Cr: 4.50% - 5.50%
Mo: 1.00%-1.50%
V: 0.8%-1.2%
S: ≤0.03%
P: ≤0.03%
MECHANICAL PROPERTIES
Hardness:
Before heat treatment, it is about HRC15~20 (HB200~230)
After heat treatment, the internal HRC is approximately 40°~45°, and the surface HV1000±100
Tensile strength: 1100-1300MPa
Yield strength: 900-1100MPa
Elongation: 12-20%
PHYSICAL PROPERTIES
Density: 7.85g/cm³
Thermal expansion coefficient: 11.8×10^-6/℃
Thermal conductivity: 41.9W/(m·K)
Wear resistance: After heat treatment, 52-54HRC, excellent wear resistance
Polishing performance: The grains of SKD61 material are small and uniform, which can produce a smoother surface and good surface finish.
HEAT TREATMENT
Quenching:
First stage preheating: 500-550℃
Second stage preheating: 750-800 ℃
Blow air cooling or high pressure gas cooling, etc., into the tempering furnace at 100-150℃.
Tempering:
Preheating: 300-350℃
Tempering Heating: 550-680℃
The air is cooled to room temperature and tempered three times. Quenching temperature 1000 ~ 1050 degrees, hardness 50 ~ 55HRC, heat treatment deformation is small, the surface can be nitrided, so that the processed products have better wear resistance.
Cryogenic treatment:
In order to obtain the highest hardness and dimensional stability, the die is cryogenically cooled immediately after quenching to – 70 – 80℃ for 3 – 4 hours, and then tempered. The hardness of the cryogenically treated tool or die is 1 – 3 HRC higher than that of the conventional heat treatment. For parts with complex shape and large size change, cryogenic treatment is dangerous to crack in production.
Nitriding treatment:
After nitriding, a hardened layer with high hardness and corrosion resistance is formed on the surface of the die or workpiece.
FORGING
For forging SKD61 tool steel, first slowly Preheat to 750°C(1382°F), soak enough time, then rapidly heat to 1050-1100 °C(1922-2030°F). then start forging, ensure the forging temperature higher than 850°C(1562°F). Cool SKD61 tool steel must be slowly after H13 steel forging finished.
