Cu/Cr/Ni Alloyed Q550NH Steel Coil

Gnee Steel (Tianjin) Co., Ltd. is one of the most professional cu/cr/ni alloyed q550nh steel coil manufacturers and suppliers in China. Welcome to wholesale customized cu/cr/ni alloyed q550nh steel coil at competitive price from our factory. Good service and quality products are available.

Designed for precision manufacturing and structural applications, the Cu/Cr/Ni alloyed Q550NH steel coil adheres to GB/T 4171-2008, delivering a synergistic combination of high mechanical performance, atmospheric corrosion resistance, and processability. This cold-rolled or hot-rolled coil is formulated with strategic additions of copper (0.20–0.55%), chromium (0.30–1.25%), and nickel (0.12–0.65%), which promote the formation of a dense, adherent rust layer (composed of FeOOH, Fe₃O₄, and alloyed oxides) that reduces corrosion rates to 1/3–1/5 of conventional carbon steel in industrial and coastal environments.

Chemical Composition (GB/T 4171-2008, Mass %)

Mechanical Properties (Thickness ≤16mm, GB/T 4171-2008)

Manufactured via thermo-mechanical controlled processing (TMCP), the coil undergoes precise rolling and cooling to achieve a fine-grained ferrite-pearlite microstructure, enhancing formability for cold bending, stamping, and roll-forming operations. Its uniform mechanical properties across the coil width ensure consistent performance in fabricated components, such as profiles, brackets, and tubular structures.

Corrosion Resistance Mechanism

The alloying elements work in synergy:

Copper (Cu) initiates the formation of a stable rust layer, improving adhesion and reducing electrolyte penetration.

Chromium (Cr) enhances passive film stability, resisting pitting in sulfur dioxide–rich atmospheres.

Nickel (Ni) boosts low-temperature toughness and accelerates the crystallization of protective oxides, particularly in humid or saline environments.

Fabrication & Weldability

Suitable for both manual and automated welding processes, the coil supports fusion welding with Ni/Cu-bearing electrodes or flux-cored wires (e.g., AWS A5.29 E81T1-Ni1), ensuring weld metal corrosion resistance (atmospheric corrosion index I ≥6.2) and matching -40°C impact toughness. Its low carbon equivalent (CE ≤0.42%) minimizes hydrogen-induced cracking, even in thick-section assemblies.

Applications

Ideal for high-strength, corrosion-critical fabricated components:

Transportation: Railway car bodies, truck frames, and trailer structures, reducing weight by 30% while extending service life.

Construction: Prefabricated steel panels, roof trusses, and exposed structural elements in bridges or stadiums, eliminating the need for protective coatings.

Energy & Industry: Solar panel mounts, wind turbine enclosures, and chemical storage tanks, thriving in harsh outdoor or industrial settings with minimal maintenance.

Marine Engineering: Coastal infrastructure, port equipment, and offshore support structures, resisting chloride-induced corrosion through its self-protective oxide layer.

Environmental & Economic Benefits

By eliminating paint reliance, Q550NH steel coil reduces VOC emissions and lifecycle costs associated with repainting, aligning with global sustainability goals. Its 2–8x higher corrosion resistance translates to a service life exceeding 100 years, making it a cost-efficient choice for projects prioritizing durability and low environmental impact.

Engineered for precision and performance, the Cu/Cr/Ni alloyed Q550NH steel coil sets a standard for high-strength, weathering-resistant materials in modern manufacturing, offering unmatched reliability in demanding environments while enabling lightweight, sustainable designs.

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