9Cr2Mo material is a typical Cr2 series cold roll steel. It is used to manufacture rolls, pressing rolls and cold dies for cold rolling.
9Cr2Mo Worldwide Equivalents
|country / region||China||EU||Germany||Japan||France||England|
|country / region||Poland||Czechia||Austria||Russia||Inter|
9Cr2Mo Steel Chemical Composition
9Cr2Mo Mechanical Properties
Annealing hardness HBW: ≤ 229
Rockwell hardness HRC: ≥ 64
Heat treatment process
1. Spheroidizing annealing. 790~810℃ heating, 650~670℃ isothermal, ≤500℃ air cooling;
2. Quenching. Heating temperature = 880~900℃, quenching and cooling. According to different workpiece structures and different requirements, cooling media. Such as water, PAG quenching fluid, and oil can be used.
3. Critical point temperature. Ac1 =740°C, Ar1 =700°C, Accm:850°C
4. The cold-pressed blank is generally softened. (820±10)°c ×3 ~4h, with a cooling rate of ≤15°C/h, slowly cool to ≤650°C with the furnace, and air-cooled.
5. Isothermal spheroidization and softening of cold-pressed blanks. (820±10) °C ×3 ~4h, (720 ±10) °C ×6 ~8h, and then slowly cooled to ≤600 °C with the furnace, and air-cooled. The hardness before treatment is ≤217HBW, and the hardness after treatment is ≥170HBW.
6. Normalizing. Normalizing temperature 900 ~ 920°C, hardness 302-388HBW.
7. Batch isothermal spheroidizing annealing. 790 ~810°C ×2 ~3h, furnace cooling, 7O0 -720°C ×3 ~4h, hardness≤217HBW, pearlite structure grade 2-5, mesh carbide grade≤2 grade
8. Quenching and tempering
- 1) Quenching temperature 830 – 850°C, Hardness 62~65HRC. Tempering temperature 130~150°C, hardness 62~65HRC.
- 2) Quenching temperature 840~860°C, hardness 61~63HRC. Tempering temperature 150~170°C, hardness 60~62HRC.
9Cr2Mo features and Applications
Rolls, press rolls and cold dies for cold rolling.