When the nitrogen content in steel is high, its surface will turn blue when heated to a temperature range of 250 to 450 degree , the strength of the steel will increase, and the impact toughness will decrease. As the nitrogen content in steel increases, the welding performance of the steel deteriorates.

Adding an appropriate amount of Al to steel can generate stable AlN, which can limit the generation and precipitation of Fe4N. It not only improves the aging performance of the steel, but also prevents the growth of austenite grains. In summary, the effect of nitrogen in ferrous silicon nitride on molten steel is shared with you. Only by understanding these can we better exert its effect in future practical applications.