Q420R Steel Boiler Plate
Q420R is a kind of boiler and pressure vessel steel plate, the executive standard: GB713-2014.
Brand name expression: Q420R. Q-"Qu" the first letter of the hanyu pinyin. 245-yield strength value. r: "Rong" the first letter of the hanyu pinyin. q420r has Q420R has special composition and properties, mainly used in pressure vessels. Q420R is mainly used in the manufacture of mobile pressure vessels, such as automobile tank cars and railroad tank cars. It has high strength, high toughness and excellent weldability.
Q420R pressure vessel steel plate chemical composition
| C | Si | Mn | Cu | Ni | Cr | Mo | Nb | V | Ti | Alt | P | S |
| ≤0.2 | ≤0.55 | 1.3-1.7 | ≤0.3 | 0.2-0.5 | ≤0.3 | ≤0.08 | 0.015-0.05 | ≤0.1 | ≤0.03 | ≤0.02 | ≤0.01 |
Q420R pressure vessel plate material mechanical property
| Trademark | thickness | Yield strength (MPa) | Tensile strength (MPa) | Elongation after break A (%) | 180° Cold Bay d=3a | Impact test temperature and impact energy |
| Q420R | 10-20 | ≥420 | 590-720 | ≥18 | d=3a | -20℃ ≥60 |
| >20-30 | ≥400 | 570-700 | d=3a | -20℃ ≥60 |
Q420R vessel steel plate dimensions, shape, weight and allowable deviation
1. The size, shape and allowable deviation of the steel plate should comply with the regulations of GB/T709.
2. The thickness deviation of the steel plate should comply with the Class B deviation requirements of GB/T709. According to the requirements of the buyer, it can also be delivered according to the Class C deviation of GB/T709.
3. The steel plate is delivered according to the theoretical weight, and the density of the steel plate used for calculation is 7.85g/cm³.
Q420R pressure vessel quality steel plate smelting method
1. Q420R steel smelted by oxygen converter or electric furnace, and should be used outside the furnace refining process
2. Continuous casting billet, ingot compression ratio of not less than 3, electroslag remelting billet compression ratio of not less than 2.
Q420R boiler quality plates Ultrasonic Inspection
Q420R pressure vessel steel sheet should be ultrasonically tested per sheet according to the requirements of the demand side, and the testing method should be executed according to JB/T4730.3 or GB/T2970.
Q420R Boiler and Pressure veseel steel plate product image
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