GB1591 Q420D grade
is a low-alloy high-strength structural steel material. Q420D steel has high strength and good fatigue resistance; high toughness and low brittle transition temperature; good cold forming performance and welding performance; good corrosion performance and certain wear resistance.
What does Q420D steel stand for?The grade of Q420D steel is composed of three parts: Chinese Pinyin letters representing yield strength, yield strength value, and quality grade symbol.
Q—The first letter of the Chinese Pinyin of "qufu" for the yield strength of steel;
420—Yield strength value, unit MPa;
D—The steel quality level.
When the buyer needs the steel plate to have thickness direction performance, add the symbol representing the thickness direction (Z-direction) performance level after the above-mentioned grades, for example: Q420DZ15.
Application of Q420D platesGB1591 Q420D high strength structural steel used for manufacturing large ships, bridges, power station equipment, medium and high pressure boilers, high pressure vessels, rolling stock, overweight machinery, mining machinery, and other large welded structural parts.
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