Q355NH is atmospheric corrosion resistance steel plate, also known as weather resistance steel plate. Q" is the first letter of yield pinyin. "355" means its yield strength is 355MPa. "NH" is the first letter of Weathering Pinyin.
Q355NH delivery status: hot rolling, controlled rolling, normalizing, etc
Q355NH execution standard: GB/T4171-2008
Q355NH chemical composition
① In order to improve the properties of steel, one or more trace alloying elements can be added: Nb 0.015%-0.060%, V 0.02%-0.12%,Ti 0.02%-0.10%, Alt≥0.020%. If the above elements are used in combination, the content of at least one element shall reach the lower limit of the above chemical composition.
②The following alloying elements can be added: Mo≤0.30%, Zr≤0.15%
Q355NH mechanical properties
Q355NH features weathering steel is made of plain carbon steel with a small amount of copper, brocade and other corrosion resistant elements, with high quality steel toughness, plastic extension, forming, welding and cutting, abrasion, high temperature, fatigue resistance and other characteristics; Weather resistance is 2~8 times of ordinary carbon steel, coating is 1.5~10 times 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.
Q355NH application of weathering steel is mainly used for railway, vehicles, Bridges, pylons and other steel structures exposed to the atmosphere for a long time. Used for manufacturing containers, railway vehicles, oil derricks, port buildings, oil production platforms and chemical and petroleum equipment containing hydrogen sulfide corrosive medium containers and other structural parts.
GB/T4171-2008, high weathering steel and welding weathering steel, the grade of this steel by representing the "yield strength" letter Q and "high weather resistance" letter GNH, "weather resistance" letter NH and steel quality grade (A, B, C, D, E) in order, such as Q355GNHC, Q46ONHD.
High weathering steel, according to the standard provisions of a total of Q295GNH,Q355GNH, Q265GNH,Q310GNH four grades; Welding weathering steel, according to the standard of Q235NH, Q295NH,Q355NH, Q415NH, Q460NH, Q50ONH,Q55ONH seven grades.
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