What is HPM75 made of

HPM75 is a non-magnetic, high hardness, free cutting plastic die steel produced by special smelting process. It is a non-magnetic, high strength Austenitic non-magnetic die steel in HPM series. Austenite is stable in various states and has very low permeability. HPM75 non-magnetic steel has high hardness, wear resistance, corrosion resistance and non-magnetic properties comparable to stainless steel SUS304 and many other die characteristics; Therefore, it is suitable for mold products with high requirements on corrosion and wear resistance. Adopting gas nitrocarburizing heat treatment can further improve the surface hardness and wear resistance, and thus prolong the service life of the die. HPM75 non-magnetic steel is prone to work hardening, so low speed machining is recommended.

 

HPM75 non magnetic round steel chemical composition

HPM75 die steel plate

C	Si	Mn	Cr	Mo	W	V	Al
	0.65-0.75	≤0.80	14.5-16.0	2.0-2.5	0.5-0.8	0.5-0.8	1.5-2.0	2.7-3.3

 

HPM75 non-magnetic steel plate use

HPM75 non-magnetic steel plate is suitable for making plastic mould and rubber mould with high corrosion resistance and high wear resistance.

HPM75 non-magnetic steel module is suitable for making plastic moulds for semiconductor IC sealing and mould fittings requiring corrosion and rust resistance;

HPM75 non-magnetic round steel is suitable for making non-magnetic mould in electronic industry;

HPM75 non-magnetic steel round bar is suitable for hot working die in 700-800℃ industry;

HPM75 non-magnetic steel steel is suitable for non-magnetic cold mold, plastic plastic mold;

HPM75 non-magnetic steel plate is suitable for magnetic plastic, magnetic forming die;

HPM75 non-magnetic steel material is suitable for wear resistant non-magnetic tools;

HPM75 non-magnetic steel small round bar is suitable for mirror polishing mold, dust cover, TV filter plate, cosmetic box, etc.

HPM75 non-magnetic steel material is suitable for precision corrugated machining mold, office automation equipment, auto parts;

HPM75 non magnetic steel bar is suitable for discharge machining mould.

 

Supply status and factory hardness of HPM75 non-magnetic steel materials

HPM75 die steel steel rod/steel plate/round steel/round rod/steel/material/material/module supply state is aging hardening state, the factory hardness is about 42-45HRC.

 

 

Properties and characteristics of HPM75 non magnetic steel

HPM75 is a high strength Austenitic shape non-magnetic die steel, which can maintain stable austenite in various states. Therefore, HPM75 non-magnetic steel has ultra-low permeability, high high temperature strength and hardness, excellent toughness and weldability, excellent mechanical properties and excellent wear resistance. HPM75 non-magnetic steel has been aging hardening treatment, without any heat treatment; The uniform structure of steel is suitable for precise etching processing.

 

HPM75 non-magnetic steel round bar heat treatment process (HPM75 quenching/tempering process), HPM75 hardness after heat treatment

1. HPM75 non-magnetic steel ingot: heating temperature 1150-1170℃, heating time ≥8h, start temperature 1100-1120℃, end temperature ≥950℃, air cooling;

2. HPM75 non-magnetic steel billet: heating temperature 1140-1160℃, heating time ≥8h, start temperature 1080-1100℃, end temperature ≥950℃, air cooling;

3. Quenching temperature of non-magnetic steel HPM75

4. Tempering temperature of non-magnetic steel HPM75

5. Quenching process of non-magnetic steel HPM75

 

High temperature annealing process of HPM75 non magnetic steel

HPM75 non-magnetic steel annealing temperature 870-890℃, holding 3-6h, furnace cooling below 500℃ out of air cooling. The hardness of HPM75 after annealing is 28-30HRC, and the microstructure is fine grain austenite + uniformly distributed granular carbide. High temperature annealing can improve the machinability of HPM75 steel.

 

Solution treatment process of HPM75 non magnetic steel

HPM75 non-magnetic steel solution temperature 1150-1180℃, salt bath furnace insulation 15-20min/mm, box furnace insulation 30min/mm, water cooling, HPM75 solution hardness 20-22HRC, metallographic structure: austenite + undissolved primary carbide.

 

Aging process of HPM75 non magnetic steel

HPM75 non-magnetic steel aging temperature 650-700℃, aging 15-20h, air cooling, HPM75 after aging treatment hardness ≥45HRC.

 

 

Gas nitrocarburizing process of HPM75 magnetic steel

HPM75 non-magnetic steel co-permeability temperature 560-570℃, co-permeability time 4-6h, surface hardness 950-1100hV, nitriding layer depth 0.03-0.04mm.

 

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