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The gradation of non-coking coal is based on Useful Heat Value (UHV), the gradation of coking coal is based on ash content and for semi coking / weakly coking coal it is based on ash plus moisture content , as in vogue as per notification.


Grades of Coking Coal

Grade Ash Content
Steel Grade - I Not exceeding 15%
Steel Grade -II Exceeding 15% but not exceeding 18%
Washery Grade -I Exceeding 18% but not exceeding 21%
Washery Grade -II Exceeding 21% but not exceeding 24%
Washery Grade -III Exceeding 24% but not exceeding 28%
Washery Grade -IV Exceeding 28% but not exceeding 35%

Grades of Non-coking Coal

Grade Useful Heat Value (UHV) (Kcal/Kg) UHV= 8900-138(A+M) Corresponding Ash% + Moisture % at (60% RH & 40OC) Gross Calorific Value GCV (Kcal/ Kg) (at 5% moisture level)
A Exceeding 6200 Not exceeding 19.5 Exceeding 6454
B Exceeding 5600 but not exceeding 6200 19.6 to 23.8 Exceeding 6049 but not exceeding 6454
C Exceeding 4940 but not exceeding 5600 23.9 to 28.6 Exceeding 5597 but not exceeding. 6049
D Exceeding 4200 but not exceeding 4940 28.7 to 34.0 Exceeding 5089 but not Exceeding 5597
E Exceeding 3360 but not exceeding 4200 34.1 to 40.0 Exceeding 4324 but not exceeding 5089
F Exceeding 2400 but not exceeding 3360 40.1 to 47.0 Exceeding 3865 but not exceeding. 4324
G Exceeding 1300 but not exceeding 2400 47.1 to 55.0 Exceeding 3113 but not exceeding 3865

Grades of Semi-coking and Weakly Coking Coal

Grade Ash + Moisture Content
Semi coking grade - I Not exceeding 19%
Semi coking grade - II Exceeding 19% but not exceeding 24%

Grades of NEC Coal :

Grades UHV (Kcal/Kg) Corresponding Ash% + Moisture %age
A 6200-6299 18.85 - 19.57
B 5600 - 6199 19.58 - 23.91