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Wednesday, June 15, 2011

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


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


Useful Heat Value (UHV)


UHV= 8900-138(A+M)


Ash% + Moisture % 

at (60% RH & 40O  C)

Gross Calorific Value GCV (Kcal/ Kg)

(at 5% moisture level)


Exceeding  6200

Not  exceeding 19.5

Exceeding 6454


Exceeding 5600 but not exceeding  6200

19.6 to 23.8

Exceeding 6049 but not exceeding 6454


Exceeding 4940 but not exceeding 5600

23.9 to 28.6

Exceeding 5597 but not exceeding. 6049


Exceeding 4200 but not exceeding 4940

28.7 to 34.0

Exceeding 5089 but not Exceeding 5597


Exceeding 3360 but not exceeding 4200

34.1 to 40.0

Exceeding 4324 but not exceeding 5089


Exceeding 2400 but not exceeding 3360

40.1 to 47.0

Exceeding 3865 but not exceeding. 4324


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


Ash + Moisture Content

Semi coking grade –I

Not exceeding 19%

Semi coking grade –II

Exceeding 19% but not exceeding 24%

Grades of NEC Coal : 


UHV (Kcal/Kg)


Ash% + Moisture %age



18.85 – 19.57


5600 – 6199

19.58 – 23.91

Source: Ministry of Coal

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