Q550D steel plate is a grade D steel with a yield strength of 550mpa. Q550D steel plate is a kind of high strength low alloy steel. Q is the yield strength of the steel, 550 is the value of the yield strength in MPa; D means the quality grade is D grade. Shock temperature represents -20°C.
The implementation standard of Q550D steel plate is GB/T 16270-2009; GB/T1591-2018.
The delivery status of Q550D steel plate is that Q550D steel plate is generally delivered in the condition of quenching and tempering.
The Q550D smelting method is that the steel is smelted in a converter or an electric furnace, and if necessary, extra-furnace refining is added.
Mechanical function of Q550D steel plate
Thickness≤50mm;
Yield ≥ 550MPA;
Tensile degree 670-830MPA;
Elongation ≥ 16%;
Longitudinal impact ≥ 40 (-20 ℃)
After Q550D steel plate is welded, stress-reducing heat treatment can be done, such as tempering at medium temperature. Heat treatment is not done casually. It must be evaluated by welding and process technicians according to technical requirements.
Q550D steel plate is mainly used in important (low temperature) high-strength structural parts, engineering machinery, mining steel structural parts, etc.
