What is the heat treatment process of HPM75 nonmagnetic steel?

HPM75 is a non-magnetic die steel, which is a Japanese standard steel. HPM75 is a non-magnetic die steel with high hardness and wear resistance, which is produced by special melting process. It can maintain very stable austenite characteristics in various states and has very low magnetic permeability (μ < 1.0 1h/m). HPM75 nonmagnetic steel has excellent toughness and excellent corrosion resistance in high temperature environment, and is an ideal material for making nonmagnetic molds. HPM75 has stable chemical composition, superior performance, long service life and no rust. HPM75 nonmagnetic steel has two factory states: annealed state with hardness of 28-30 HRC；; Pre-hardened state, hardness 42-45 HRC；; ; The hardness of HPM75 surface treatment can reach 950- 1 100HV, which can meet the needs of different molds. HPM75 is widely used in electric power, rail transit, construction, national defense and many other fields. The company now has a large number of HPM75 nonmagnetic steel stocks (HPM75 nonmagnetic round steel, HPM75 nonmagnetic steel plate, HPM75 nonmagnetic steel hard material and HPM75 nonmagnetic steel raw material) with a density of 7.85.

Chemical composition of HPM75 nonmagnetic steel;

HPM75 nonmagnetic die steel contains 80% chemical elements.

C, Si, Mn, Cr, Mo, V and Al

0.65-0.75 0.80 15- 17 2-2.5 0.5-0.8 1.5-2 0.5-0.8 2.7-3.3

Properties of HPM75 nonmagnetic steel;

1. High strength

2. Ultra low permeability

3. Non-magnetic

4. High hardness

5. Wear resistance

6. No rust

7. Long service life

8. Stable chemical composition

9. Corrosion resistance

Application of HPM75 nonmagnetic steel;

1.HPM75 steel is suitable for mirror polishing molds, dust covers, TV filter plates, cosmetic boxes, transparent food boxes, etc.

2.HPM75 material is suitable for EDM die.

3.HPM75 material is suitable for precision corrugated molds, office automation equipment and auto parts.

Hardness of HPM75 nonmagnetic steel;

Ex-factory hardness: 300HBW, 450HBW

Nitriding hardness: 65HRC

Supply of HPM75 nonmagnetic steel:

In annealed and pre-hardened state, the scale on the surface of round steel and steel plate.

Heat treatment and metallographic structure of HPM75 nonmagnetic steel;

Heat treatment process of HPM75: solid solution1150-1180℃ water cooling; Aging at 650-700 DEG C; Air cooling, hardness 43-45HRC.

HPM75: Metallographic Structure of Austenite

The heat treatment parameters are as follows: HPM75 high temperature softening annealing heating temperature℃

Holding time/hour

Cooling mode

Hardness /HRC

870-890

three

furnace cooling

28-32

Solution aging treatment of HPM75

Solution temperature/℃

1 150- 1 180

Holding time/hour

15-20 (salt furnace)

cooling medium

water

Hardness /HRC

20-24

Aging temperature/℃

700

Holding time/hour

2

cooling medium

air-cooling

Hardness /HRC

248