Susceptibility of 30Kh2N4M and 30Kh2N2M steels to embrittlement at low temperatures

Conclusions

• 1. Chrominum-nickel-molybdenum steel tempered at high temperatures has the minimum embrittlement temperature when the steel has a martensitic structure after quenching.

• 2. The higher the degree of decomposition of austenite in the pearlite and troostite range of temperatures, the higher the temperature of embrittlement.

• 3. The increases of the quenching temperature above the Ac₃ point increases the embrittlement temperature.

• 4. Quenching in a heated medium increases the embrittlement temperature in all cases if the austenite decomposes and forms troostite or pearlite.

• 5. The increase of the tempering temperature decreases the embrittlement temperature.