Manual prediction

Enter the heat process parameters to obtain a nitrogen content prediction before tapping.

Current prediction (ppm)
—
Sievert N eq (ppm)
—
η attenuation
—
Δ vs. actual (ppm)
—
Steel chemistry (wt%)
0.01 – 1.2
0.01 – 2.0
0.001 – 0.1
0.001 – 0.05
Slag chemistry (wt%)
1 – 40
0 – 15
0 – 25
20 – 65
1.5 – 6.0
Process parameters
1580 – 1730
0.01 – 0.15
600 – 1500
0 – 300
0.05 – 0.35
0.1 – 1.5
Reference value (optional)
Measured value for comparison
Optional heat identifier
NitroPINN prediction result
Predicted N (ppm)
—
— wt%
Sievert N eq (ppm)
—
— wt%
η attenuation
—
—

Batch CSV upload

Upload a CSV file with columns matching the 15 NitroPINN input variables. The results will be added to history.

CSV file format

The CSV must contain a header with exact column names (comma-separated):

heat_id,C,Mn,P,S,Fe_slag,MnO_slag,SiO2_slag,CaO_slag,slag_basicity,Ttap,Oactivity,tblow,treblow,scrap_ratio,Crate,actual_N

Columns heat_id and actual_N are optional.

Drag and drop a CSV here or click

Supported formats: .csv · Max. 5 MB

Prediction history

All manual and batch predictions from the current session.

Predicted vs. actual

Visualization of model accuracy. Requires records with actual measured values.

Not enough data

Add actual measured values (Actual N) to prediction history.

About the model NitroPINN

Physics-Informed Neural Network for predicting nitrogen in liquid steel before tapping from a BOF converter.

Architecture
  • 🔷 Input: 16 normalized features (Z-score)
  • 🔷 Backbone: FC 64→32→16, Tanh, Dropout 0.15
  • 🔷 η-head: Linear(16,1) + Sigmoid → [0,1]
  • 🔷 δ-head: Linear(16,1) → residual correction
  • 🔷 Output: Npred = η·Neq + δ
Physical constraints
  • ⚛️ Sieverts law: log Neq = −3750/T − 1.154 + 0.5·log pN₂ − log fN
  • ⚛️ Wagner formalism: log fN = Σ eⱼ·[j] (C, Mn, P, S, O)
  • ⚛️ η penalty: [0.05, 0.95] bounds
Performance (5-fold CV)
7.98
RMSE (ppm)
5.60
MAE (ppm)
0.325
R²
16 input features
C, Mn, P, S (steel)Fe, MnO, SiO₂, CaO (slag) Slag basicityTapping temperature Ttap Oxygen activityBlowing time tblow Reblowing time treblowScrap ratio Decarburization rate ĊNeq (Sievert)