Generally, coking coal is above 14, which is reserved in the contract.

If you want to improve the Y value, you must add fat coal or main coke clean coal, which will inevitably cause changes in G and V ... If the change is not big, it will not affect the price.

General coking coal: y>16g & gt85a <; 10.5V & lt； 28

Fat coal: Y & gt20 & gt90a <; 10.5V & gt； 28

1/3 coking coal: y>14g & gt75a & lt10.528 < V & lt37

thank you