Characteristics of Materials
- Steels are high-hardenability high-nickel steel and low-carbon high-alloy carburized steel. It has high hardenability and good processability. After the mold is formed, in order to improve its surface hardness and wear resistance, it needs to be carburized and quenched. The tendency of this steel oil to form white spots and temper brittleness should be noted during heat treatment.
- Chemical composition
- According to the standard
B/3~
-, the chemical composition (mass fraction) of the steel:
~.3
- ,
~.3
- ,
3~
- ,
~
- ,
3.~3
- ,
-
3
- ,
-
3
-.
- Critical point temperature (approximate value)
- ℃,
3
- ℃,
r
- ℃,
r3
- ℃,
- ℃.
- Hot processing specifications
- Heating temperature
- ℃, starting temperature
~
- ℃, end temperature
- ℃, slow cooling after hot processing .
- High temperature annealing specifications
- Annealing temperature
~
- ℃, furnace cooling, hardness
-.
- Annealing specifications
- Annealing temperature
~
- ℃, air cooling out of the furnace, hardness
-.
- Specifications for carburizing, quenching and tempering
- Carburizing temperature
~
- ℃ (cooling in the tank), carburizing time depends on the thickness of the carburizing layer.
- First quenching temperature
~
- ℃, oil cooling, tempering temperature
~
- ℃, air cooling.
- Second quenching temperature
~
- ℃, oil cooling, low temperature tempering temperature
~
- ℃, air cooling, surface hardness
- , core hardness
~
-.
- Carbonitriding, quenching and tempering specifications
- Carbonitriding temperature
~
- ℃, oil quenching directly after coming out of the furnace, hardness
-. Tempering temperature
~
- ℃, air cooling, hardness
-.
- Typical application examples
-) Suitable for making large and medium-sized plastic molds.
-) can be used to manufacture carburized mold parts that can withstand high loads.
20Cr2Ni4A mold steel