7Mn15 Non-Magnetic Die Steel

7mn15cr2al3v2wmo

——7mn15cr2al3v2wmo High Wear-Resistant Non-Magnetic Steel

Properties

What is 7mn15cr2al3v2wmo material? 7mn15cr2al3v2wmo, full name 7mn15cr2al3v2wmo non-magnetic steel, is a high Mo-V series non-magnetic steel. 7mn15cr2al3v2wmo material maintains stable austenite in various states, has very low magnetic permeability, high high-temperature strength and hardness, and high wear resistance. Due to the cold working hardening phenomenon of high manganese steel, machining is relatively difficult, requiring high-temperature annealing processes that can alter the particle size, morphology, and distribution of carbides, significantly improving the machinability of non-magnetic steel. Using gas nitrocarburizing heat treatment processes can further increase the surface hardness of the steel, enhance wear resistance, and extend the service life of molds.

Chemical Composition

Chemical composition of 7mn15cr2al3v2wmo non-magnetic steel

C 0.70    Si 0.80    Mn 15.2    Cr 2.0    W 0.6    Mo 0.6    V 1.7    Al 2.1    Cu 0.03

Applications

7mn15cr2al3v2wmo non-magnetic mold steel plates are suitable for making non-magnetic molds in the electronics industry; non-magnetic bearings and other structural parts that require no magnetic induction in strong magnetic fields; industrial hot work molds at 700-800°C; non-magnetic cold work molds, plastic and rubber molds; magnetic plastic and magnetic field forming molds; wear-resistant non-magnetic tools; EDM molds; non-magnetic molds for magnetic material factories; and precision mold components such as exhaust valves for high-intensity gasoline and diesel engines.

Characteristics

7mn15cr2al3v2wmo non-magnetic material is applied to permanent magnet motors due to its low magnetic permeability and high mechanical strength, but its high hardness and toughness add difficulty to machining.

Heat Treatment Solution and Aging Process

7mn15cr2al3v2wmo annealing temperature 880-900°C, holding time 3-6h, furnace cooling, air cooling below 500°C, hardness 28-30HRC; microstructure is fine-grained austenite + uniformly distributed carbide particles. 7mn15cr2al3v2wmo solution temperature 1170-1190°C, hold for 15-20min, water cooling. Non-magnetic steel aging treatment temperature 650-700°C, aging for 15-20h, air cooling, hardness ≥45HRC.

Gas Nitrocarburizing Process

Gas nitrocarburizing process parameters for 7mn15cr2al3v2wmo non-magnetic steel: nitriding temperature 550-570°C, nitriding time 4-6h, achievable layer depth 0.03-0.04mm, surface hardness of the layer 950-1100HV.

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