High strength Class AH, DH, EH and FH steel, each of these grades has three different minimum yield strength: 315MPa (32), 350MPa (36), 390MPa(40), that is to say, this type of steel can be subdivided into: AH32, AH36, AH40, DH32, DH36, DH40, EH32, EH36, EH40,FH32, FH32,FH36, FH40, a total of 12 grades.
Again, by the way A, B, D, CS, B, and AH, DH, EH, and FH, the meaning of these distinctions are mainly divided according to the low temperature properties of steel: the impact of the grade A steel temperature is 20 degrees Celsius, the impact of B and AH temperature is 0 degrees Celsius, the impact of the D and DH temperature is 20 degrees Celsius, E, the impact of the CS and EH is to 40 degrees Celsius temperature, the impact of the FH level temperature is 60 degrees Celsius.
