Strategies to Increase Nitrogen Pickup Using Ferrochromium Nitride-Yuboo Detection Technology Co., Ltd.

Strategies to Increase Nitrogen Pickup Using Ferrochromium Nitride

Release Time:

2026-09-11 17:22

Increase the addition rate of ferrochromium nitride: Calculate the nitrogen mass balance and moderately raise the ferrochromium nitride dosage. The concurrent rise in chromium content and its impact on molten steel composition must be taken into consideration.
Adopt high-nitrogen grade ferrochromium nitride: Select grades with higher nitrogen content (e.g., ferrochromium nitride containing 6–8% N) to minimise dilution of molten steel by impurity elements.
Batch feeding: Prevent nitrogen escape caused by one-time bulk addition. Add the alloy in 2 to 3 batches after complete melting, with an interval of 5–10 minutes between each addition to boost nitrogen absorption efficiency.

Control melting temperature: Nitrogen solubility in molten steel rises as temperature drops. Reduce tapping temperature appropriately (e.g., 1500–1550°C) while guaranteeing adequate fluidity of molten steel.
Pressurised melting: If equipment conditions permit, introduce nitrogen gas and maintain pressure at 0.1–0.3 MPa to greatly improve nitrogen solubility. (Approx. 0.01–0.02% N gain per 0.1 MPa pressure increase.)
Electromagnetic stirring: Enhance flow within the molten pool to accelerate dissolution of ferrochromium nitride and achieve uniform nitrogen distribution.

Adjust Cr and Mn contents: Chromium and manganese are nitrogen-stabilising elements. Raising Cr to 17–18% and Mn to 8–10% can improve nitrogen solubility.
Control carbon and sulphur levels: Maintain low carbon (<0.03%) and low sulphur (<0.01%) to mitigate nitrogen loss via gaseous compounds formed with carbon and sulphur.

Slag covering protection: Cover molten steel with basic slag in the later melting stage to isolate nitrogen from air contact.
Shorten operation duration: Reduce holding time at high temperatures and complete tapping and pouring rapidly.