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2025-09-15 09:57:14
Surface quality grades for cold-rolled coils are typically categorised based on permissible surface imperfections and appearance requirements. Common grades include Ordinary Surface (O), Surface (A), Surface (B), and Surface Surface (C). Ordinary surface permits minor defects and is suitable for structural components with low aesthetic demands; Surface requires a smooth finish without visible imperfections, commonly used in home appliances and decoration; Surface demands high smoothness and flawlessness, suitable for automotive panels and electronic casings. Grading terminology and specific requirements vary slightly across standards (e.g., GB, JIS, ASTM).
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2025-09-15 09:55:36
Cold-rolled coils are available in diverse materials, with common types including ordinary carbon steel (such as SPCC, DC01, Q195, Q235), high-strength low-alloy steel (HSLA), deep-drawing steel (e.g., DC04, DC06), dual-phase steel (DP steel), martensitic steel (MS steel), and stainless steel (e.g., 304, 316, 430). Each material exhibits distinct chemical compositions, mechanical properties, and corrosion resistance, making them suitable for different applications. For instance, ordinary carbon steel is cost-effective with good workability, ideal for general structural components; stainless steel offers corrosion resistance and aesthetic appeal, frequently used in food machinery, medical equipment, and decorative applications; high-strength steel is extensively employed in automotive lightweight manufacturing.
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2025-09-15 09:55:19
During cold rolling, metal undergoes plastic deformation at ambient temperatures. Grains are flattened, elongated, or fractured, causing work hardening manifested as increased strength and hardness alongside reduced plasticity and toughness. This impedes subsequent forming processes like stamping and bending. Annealing involves heating the cold-rolled coil to a specific temperature (typically 600°C to 700°C) and holding it for a period to restore the internal structure to equilibrium. This relieves internal stresses, reduces hardness, and restores plasticity, thereby improving workability. The annealing process requires precise control of temperature and duration based on material type and performance requirements.
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2025-09-15 09:54:17
The production process for cold-rolled coils primarily comprises: acid pickling of hot-rolled coils (to remove scale), cold rolling (reducing thickness to target dimensions at ambient temperature), annealing (to relieve work hardening and restore ductility), levelling (to achieve uniform sheet shape and surface quality), finishing (trimming edges, coil separation, straightening), surface treatment (oiling, galvanising, etc.), and packaging for storage. Each stage requires strict control of process parameters—such as rolling pressure, annealing temperature, and levelling elongation—to ensure consistent product performance, favourable appearance, and dimensional accuracy.
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2025-09-15 09:53:39
The primary differences between cold-rolled and hot-rolled coils lie in their production processes, properties, and application domains. Cold-rolled coils are manufactured at ambient temperatures, yielding a smooth surface, high precision, and thin thicknesses. However, they entail higher production costs and require annealing to mitigate work hardening. Hot-rolled coils, rolled at elevated temperatures, offer a wider thickness range and superior toughness, though their surface quality and dimensional accuracy are inferior to cold-rolled coils. Cold-rolled coils are commonly used in high-precision applications such as automotive panels and appliance casings, while hot-rolled coils are predominantly employed in construction structures, piping, and mechanical components where precision requirements are less stringent.
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2025-09-15 09:52:28
Cold-rolled coil is a steel product manufactured by rolling hot-rolled coil through a cold-rolling mill at ambient temperatures after pickling to remove surface scale. The cold rolling process does not produce scale, resulting in a smooth surface, high dimensional accuracy, and uniform thickness. Rolling at low temperatures flattens and elongates the material's grains, inducing work hardening that enhances strength and hardness. Cold-rolled coils are widely used in automotive manufacturing, home appliances, electronics, architectural decoration, and metal products industries, particularly suited for products demanding high aesthetic and dimensional precision.
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