Q355GNHA introduction of high weathering steel plate
Q355GNHA introduction
of steel plates for pressure vessels 1. Q355GNHA belongs to high weathering steel plates, which implements GB/T4171 standards. Weathering steel is made by adding a small number of alloying elements such as Cu, P, Cr, Ni, etc., so that it forms a protective layer on the fundamental surface of the metal, so as to improve the atmospheric corrosion resistance of steel. The trademark of steel consists of "yield strength", "high weather resistance", the first letter "Q" in Chinese pinyin, the lower limit of the yield strength of GNH, and the quality grade (A, B, C, D, E). It is mainly used in vehicles, containers, construction, towers or other structural parts and other structures, and has better atmospheric corrosion resistance than welded weathering steel. The thickness of the steel plate can be ≤ 20mm
| Chemical composition |
| Tabulation: Depu Steel Date: 2024-01-18 |
| C |
Si |
Mn |
P |
S |
Cr |
Ni |
Cu |
| 0.12 |
0.2-0.75 |
1.0 |
0.07-0.15 |
≤ 0.02 |
0.3-1.25 |
0.65 |
0.25-0.55 |
Note:
(1): In order to improve the properties of steel, the number of other trace alloying elements other than the above table can be added; It comes from the Internet and is for reference only.
(2): The allowable deviation of the chemical composition of the finished steel plate should be in accordance with the provisions of
GB/T222 Q355GNHA tensile yield strength of high weathering steel: material: Q355GNH
tensile strength: 490-630Mpa
yield strength:
345Mpa elongation: 19
180° bending test: d=3a
Q355GNHA the weathering resistance of high weathering steel is 2~8 times that of ordinary carbon steel, and the coatability is 1.5~10 times that of ordinary carbon steel. At the same time, it has the characteristics of rust resistance, corrosion resistance, life extension, thinning and consumption reduction, labor saving and energy saving. Weathering steel is mainly used in steel structures that are exposed to the atmosphere for a long time, such as railways, vehicles, bridges, and towers. Q355GNH high weathering steel is used in the manufacture of containers, railway vehicles, oil derricks, harbor buildings, oil production platforms and containers containing hydrogen sulfide corrosive media in chemical and petroleum equipment.
