Q500C high strength board:
It consists of Q+number+quality grade symbol+deoxygenation method symbol. Its steel number is prefixed with "Q", which represents the yield point of the steel, and the following number represents the yield point value in MPa. […]

Q500C low-alloy high-strength plate, Q is the capital of the first letter of the Chinese pinyin of the word "Qu" for the yield strength of steel; 500 is the yield value, in MPa; C, D, and E are the quality star grades. […]

Q420E is a low alloy high strength structural steel. Standard GB/T1591-1994, the tensile strength of Q420E is 420n/mm^2. […]

Q420E belongs to low-alloy high-strength structural steel plate, and the implementation standard of Q420E steel plate is GB/T3274 special technical conditions or international, domestic and industry standards or according to the agreement. […]

Implement the standard GB1591-2008.
It consists of Q+number+quality grade symbol+deoxygenation method symbol. […]