What is Q550NH Weather Resiatant Steel Plate？
Q550NH is a high-strength weathering steel, which implements the GB/T 4171-2008 standard and can be used to manufacture low alloy structural steel for steel structures such as vehicles, bridges, towers, containers, etc.
Chemical composition of Q550NH steel plate:
Carbon C: ≤ 0.16
Silicon Si: ≤ 0.65
Manganese Mn: ≤ 2.0
Phosphorus P: ≤ 0.025
Sulfur S: ≤ 0.030
Chromium Cr: 0.30-1.25
Copper Cu: 0.20-0.55
Nickel Ni: 0.12-0.65
Mechanical properties of Q550NH steel plate:
Yield strength: ≥ 235MPa
Tensile strength Rm: 360-510
Elongation after fracture A50mm%: ≥ 25
Delivery status of Q550NH steel plate: delivered in hot rolling, controlled rolling or normalizing status, or in quenching and tempering status.
Principle of weathering steel
After adding phosphorus, copper, chromium, nickel and other trace elements into the steel, the steel surface will form a dense and highly adhesive protective film, which will prevent the corrosion from spreading and developing inward, and protect the substrate under the rust layer to slow down its corrosion rate. About 50 μ m～100 μ The m thick amorphous spinel oxide layer is dense and has good adhesion with the base metal. Because of the existence of this dense oxide film, it prevents oxygen and water in the atmosphere from infiltrating into the steel substrate, slows down the deep development of corrosion to steel materials, and greatly improves the atmospheric corrosion resistance of steel materials. Weather-resistant steel is a steel system that can be used thinly, exposed or simply coated to make products corrosion resistant, prolong life, save labor, reduce consumption, and upgrade. It is also a steel system that can be integrated into modern metallurgical new mechanisms, new technologies, and new processes to make it sustainable development and innovation.
Weathering steel plate Production line
KUAIMA steel company has more than ten years of experience in diversified operations and multi-product transactions, involving round bar, ship plate, seamless pipe, plate, coil, wire, bright bar, pipe fittings and a wide range of carbon steel, alloy steel And more product sizes of stainless steel materials, these products we produce meet national and international quality standards, such as ASTM, ASME, DIN, JIS, ISO, etc. The company has 25 production lines for various products, with an annual output of 500,000 tons, and is committed to Provide high-quality steel products and provide supporting services and solutions for global customers. Welcome to KUAIMA steel company.
Principle of weathering steel
After adding phosphorus, copper, chromium, nickel and other trace elements into the steel, the steel surface will form a dense and highly adhesive protective film, which will prevent the corrosion from spreading and developing inward, and protect the substrate under the rust layer to slow down its corrosion rate. About 50 μ m～100 μ The m thick amorphous spinel oxide layer is dense and has good adhesion with the base metal. Because of the existence of this dense oxide film, it prevents oxygen and water in the atmosphere from infiltrating into the steel substrate, slows down the deep development of corrosion to steel materials, and greatly improves the atmospheric corrosion resistance of steel materials. Weather-resistant steel is a steel system that can be used thinly, exposed or simply coated to make products corrosion resistant, prolong life, save labor, reduce consumption, and upgrade. It is also a steel system that can be integrated into modern metallurgical new mechanisms, new technologies, and new processes to make it sustainable development and innovation.
Due to its excellent corrosion resistance, weathering steel has been widely used in steel structures such as buildings, vehicles, bridges, towers, etc. There are three main ways to use weathering steel: bare use, coating use and rust layer stabilization treatment.
Use of weathering steel
1. Exposed use:
The most common use of weathering steel is exposed. Generally, after 3 to 10 years, the rust layer on the surface of weathering steel gradually stabilizes, the corrosion development slows down, and the appearance is beautiful chocolate color.
Because the stabilization process of the rust layer of the weathering steel is affected by the chemical composition of the steel, the use environment, the stagnant water and dust in the structural details, and the mechanical wear and other conditions, if improperly used, the formation conditions of the stable rust layer will be damaged, and the weathering steel will also produce serious corrosion.
2. Application of coating:
In many departments such as buildings, bridges, vehicles, etc., weathering steel, like ordinary steel, is mostly used for coating. Compared with ordinary steel, the coated weathering steel shows excellent corrosion resistance. However, due to the increased use cost and operation process, it is difficult to apply coating to large components generally.
3. Use after stabilization:
At the beginning, a treatment is carried out on the surface of the components to shorten the formation process of the stable rust layer of the weathering steel, which can not only avoid the phenomenon of yellow rust liquid sagging in the initial use of the weathering steel, prevent pollution, but also form a stable rust layer. Although the exposed use is an economic and unique use method of the weathering steel, it takes a long time to complete the stabilization process of the rust layer in the natural environment, Before the formation of stable rust layer, the early rust liquid sagging and scattering often pollute the surrounding environment.
Weathering Steel Application industry
Weathering Steel are mainly used in chemical, petrochemical, marine engineering, seawater pipelines, seawater desalination and other industries, nuclear engineering, paper and pulp industry
oil and gas
Kuaima Steel provides a complete set of equipment and installations for drilling, transportation and storage in the oil and gas industry.
energy
Kuaima Steel serves the entire service cycle of power generation and synchronous activities in design, construction, repair and maintenance.
construction
Kuaima Steel provides comprehensive products and services for infrastructure, bridges, pipelines, etc.
marine
Kuaima Steel is a trusted supplier for subsea to surface operations and shipbuilding operations.
Weathering steel plate Application industry
Weathering steel plates are mainly used in chemical, petrochemical, marine engineering, seawater pipelines, seawater desalination and other industries, nuclear engineering, paper and pulp industry
oil and gas
Kuaima Steel provides a complete set of equipment and installations for drilling, transportation and storage in the oil and gas industry.
energy
Kuaima Steel serves the entire service cycle of power generation and synchronous activities in design, construction, repair and maintenance.
construction
Kuaima Steel provides comprehensive products and services for infrastructure, bridges, pipelines, etc.
marine
Kuaima Steel is a trusted supplier for subsea to surface operations and shipbuilding operations.
We supply and export Weathering steel plate in following countries
Malaysia, United Arab Emirates, Indonesia, Saudi Arabia, Iran, Qatar, India, China, United Kingdom, Singapore, Canada, Thailand, Korea, Turkey, Philippines, Egypt, Germany, Italy, Japan, Russia, Vietnam, Australia, South Africa , Portugal, Morocco, Costa Rica, Kazakhstan, Netherlands, Mexico, Brazil, France, Spain, Nigeria, Bangladesh, Kuwait, Iraq, Ukraine, Poland, Jordan, Romania, Oman, Hong Kong, Venezuela, Colombia, Norway, Chile, Te Trinidad and Tobago, Greece, Czech Republic, Belgium, Sri Lanka, Cyprus, Angola, Myanmar (Burma), United Kingdom, Canada, Korea, Thailand, Netherlands, Spain, Turkey, Australia, Mexico, Pakistan, Vietnam, Brazil, Philippines, France, Taiwan, Poland, South Africa, Russia, Nigeria, Kuwait, Czech Republic, Norway, Romania, Egypt, Oman, Sweden, Belgium, Hong Kong, Israel, Colombia, Switzerland, Denmark, Finland, Argentina, Venezuela, Peru, Ukraine , Chile, Bangladesh, Portugal, Ireland, Austria, Algeria, Greece, Iraq, New Zealand, Slovakia, Hungary, Kazakhstan, Slovenia, Lithuania, Serbia, Sri Lanka, Bahrain, Bulgaria, Morocco, Tunisia, Croatia, Jordan, Ecuador, Te Trinidad and Tobago, Estonia, Azerbaijan, Ghana, Lebanon, Cyprus, Dominican Republic, Latvia, Libya, Costa Rica, Cambodia, Macedonia (FYROM), Belarus, Jamaica, Palestine, Turkmenistan Belarus, Jamaica, Palestine, Turkmenistan Belarus, Jamaica, Palestine, Turkmenistan and other countries
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