over there
Q5500-6200 means calorific value is between 5500-6200, and Q refers to calorific value.
V 15- 18, that is to say, the volatilization amount is between 15%- 18%! V command volume.
S & lt0.4, which means the sulfur content is less than 0.4%! S means sulfur!
Therefore, "q5500-6200v15-18s"
In addition, among these similar concepts, there is another one
I hope these are useful to you!