What is the steel Q355GNHE?

Q355GNHE steel is a quality grade of Q355GNH weather-resistant steel. Therefore, Q355GNHE steel is also a atmospheric corrosion-resistant alloy steel. This steel has a better corrosion resistance in the atmosphere than ordinary carbon steel by adding a small amount of alloying elements. Among them, Q355GNHE weathering steel has been widely used in environments that require resistance to atmospheric corrosion, such as containers, railway vehicles, bridges, buildings, and air preheaters. Welcome to send email to [email protected] if you are interested in our Q355GNH steel sheet price.

What are the features of Q355GNHE steel?

Q355GNHE weathering steel is characterized by the addition of a small amount of Cu, P, Cr, Ni and other alloying elements to the steel, so that the steel material forms a layer of about 50 ~ 100μm thick between the rust layer and the substrate and has good adhesion to the substrate metal The amorphous spinel oxide layer prevents the infiltration of oxygen and water in the atmosphere into the steel matrix, slowing down the development of rust to the depth of the steel material, thereby greatly improving the ability of the steel material to resist atmospheric corrosion.

Technical requirements and technological process of high weathering steel Q355GNHE
Q355GNHE weathering steel has better resistance to atmospheric corrosion than welded weathering steel Q355NH. Need to ensure that the steel plate has high strength, at the same time has good plasticity and toughness. In addition, by adding corrosion-resistant elements to ensure atmospheric corrosion resistance index I to reflect its good corrosion resistance. Process flow: blast furnace molten iron → molten iron pre-desulfurization treatment → 120t converter → LF refining → continuous casting → slab heating → controlled rolling → controlled cooling → stack slow cooling → flaw detection → shearing → sampling inspection → identification → storage. 2-component design High weathering steel Q355GNH must contain 0.07% ~ 0.15% phosphorus. Phosphorus is a harmful element for ordinary steel, but the addition of Cu and P to Q355GNHE weathering steel is mainly to improve corrosion resistance and solidify. Solution strengthened ferrite. Copper plays the role of activating the cathode during the corrosion process, and under certain conditions, the steel can be anode passivated, thereby reducing the corrosion rate. In addition, the copper element is concentrated in the rust layer near the base metal, forming a tight copper oxide intermediate layer between the corrosion layer and the copper enrichment layer, which can slow down or prevent the corrosion medium from continuing to erode inward. P is an anode passivator, which accelerates the uniform dissolution of steel and the oxidation rate of Fe and the like in the electrolyte solution, which helps to form a dense protective film of amorphous iron oxyhydroxide on the surface of steel, thereby playing a role in corrosion resistance. The effect of corrosion resistance is remarkable when used together.