Q235NH weathering steel

Q235N weathering tempering chemical composition

With iron (Fe) as the main body, containing an appropriate amount of carbon (C), usually controlled below 0.14%, which helps to improve the toughness and welding performance of steel; Silicon (Si), manganese (Mn) added in appropriate amount, silicon can enhance the strength of steel, manganese can refine grain, improve strength and fatigue resistance; Phosphorus (P), sulfur (S) impurities content is strictly limited to prevent steel embrittlement; The key is to contain a certain amount of copper (Cu), chromium (Cr), nickel (Ni) and other alloying elements, copper to promote the steel surface in the atmospheric environment quickly form a dense and strong adhesion protective rust layer, chromium to enhance the stability of the rust layer, improve corrosion resistance, nickel to optimize the low temperature toughness of steel, synergistically give steel excellent weather resistance.

Q235N weathering steel properties

Basic mechanical properties: the yield strength is generally about 235MPa, and the tensile strength is about 370-500MPa, which can meet the load-bearing needs of most general buildings and mechanical structures, such as small factory frames, simple equipment supports, etc., which can withstand static load and certain dynamic load stabilities, and ensure the basic stability of the structure.

Weather resistance: specially designed for outdoor atmospheric environment, long-term exposure to wind and rain, sun, frost and snow and other natural conditions, the surface rust layer will gradually develop into a tight continuous protective film to prevent further corrosion of the internal steel, compared with ordinary carbon steel, the service life in the atmospheric environment is greatly extended, especially suitable for the appearance of maintenance requirements are not high but the pursuit of long-term durable open-air facilities.

Good processing performance: Welding performance: good welding adaptability, the use of common manual arc welding, gas shielded welding and other methods, with suitable welding materials, can form a reliable strength of the weld, the weld area and the base metal fusion is good, conducive to the on-site assembly of large steel structures, like industrial plant steel structure can be built efficient welding.

Cold processing performance: with a certain cold bending, cold rolling ability, can be made according to the design of C-type, Z-type purlin and other profiles, used in building roofing, wall system, the mechanical properties of steel during processing are basically stable, to ensure the quality of structural parts.

Q235N weathering steel application field

Construction industry: widely used in industrial plants, warehouses, agricultural greenhouses and other roofing and wall enclosure structure, with weather resistance to reduce frequent maintenance, at a lower cost to ensure the long-term use of buildings, but also used in building accessories, temporary building frames, to meet the needs of structure and beauty.

Traffic engineering: There are many applications in railway guardrail, small bridge attachment structure of highway, bus stop facilities, etc., which can withstand the erosion of outdoor traffic environment, reduce the frequency of maintenance, and ensure that traffic safety facilities are durable and reliable.

Energy and power field: Some small substations of the frame, outdoor distribution cabinet shell, the use of Q235NH weathering steel, the use of its weatherability to resist the erosion of the natural environment, to ensure the stable operation of power equipment, reduce the risk of failure caused by corrosion.