Cold Rolled Steel Plate

Cold rolled sheet is a steel plate material processed through cold rolling technology. Cold rolling, as an important processing method for steel, is the further rolling of hot-rolled steel plates at room temperature to achieve more precise dimensions, smoother surfaces, and better mechanical properties.

Cold rolled steel sheet can hold tighter tolerances than hot rolled when machined or otherwise fabricated, providing a better overall surface finish. This premium steel product is manufactured from steel alloy materials, providing a smooth, clean surface ideal for various industries, including structural, automotive, furniture, and more.

Cold rolled steel plates are primarily used in the following areas:

• Automotive manufacturing: bBody anels, chassis components (requiring high strength and formability).
• Home appliance industry: Refrigerator casings, air conditioner panels (requiring aesthetic appearance and corrosion resistance).
• Building and decoration: Curtain walls, interior partitions (surfaces can be coated or painted).
• Electronic equipment: Casings, shielding covers (excellent electromagnetic shielding performance).

Cold rolled steel plate production begins with the pretreatment of hot-rolled steel coils:
1. First, surface iron oxide scale is removed through hydrochloric acid pickling, followed by high-pressure water rinsing and drying to ensure cleanliness.
2. Subsequently, the steel coil is rolled in multiple passes at room temperature using a multi-roll reversible rolling mill (such as a four-roll or six-roll mill), reducing the thickness by 30%-70%. Emulsified lubricant is used for cooling and temperature control during this process.
3. The rolled steel coil then undergoes annealing treatment (bell-type annealing at 650-850℃ or continuous annealing line) in an H₂/N₂ protective atmosphere to eliminate work hardening and adjust the grain structure. After annealing, a light rolling process of 0.5-3% is performed using a leveling machine to improve the flatness and enhance the surface finish (Ra≤0.8μm).
4. Finally, the steel is passivated for rust prevention, electrostatically coated with oil (0.5-3g/m²), and then cut into target sizes using high-precision slitting or shearing equipment. Before packaging, quality inspection procedures such as laser thickness measurement and eddy current testing are performed to ensure compliance with standards such as ASTM A568.

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