9Cr2Mo Equivalents | Composition | Mechanical Properties

Description

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
Standard	GB	EN	DIN,WNr	JIS	AFNOR	BS
Grade	9Cr2Mo		90Cr3/1.2056	–	–	BL3
country / region	Poland	Czechia	Austria	Russia	Inter
Standard	PN	CSN	ONORM	r0CT	ISO
Grade	–	–	–	9X1	–

9Cr2Mo Steel Chemical Composition

C	Si	Mn	S	P	Cr	Mo
0.85-0.95	0.25-0.45	0.20-0.35	≤0.025	≤0.025	1.70-2.10	0.20-0.40

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.