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2025-09-15 09:59:49
The primary advantages of cold-rolled coils include: a smooth, aesthetically pleasing surface free from scale, eliminating the need for subsequent grinding; high dimensional accuracy with uniform thickness and minimal tolerances; stable mechanical properties featuring high strength and hardness to meet diverse processing requirements; excellent workability suitable for forming processes such as stamping, bending, and welding; and a wide range of specifications allowing production of varying thicknesses, widths, and materials to meet specific demands. Certain grades exhibit outstanding corrosion resistance after surface treatments (e.g., galvanising, colour coating). These attributes render cold-rolled coils indispensable across numerous industries.
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2025-09-15 09:59:04
Cold-rolled coils require protection against moisture, corrosion, and physical damage during storage and transportation. They should be stored in dry, well-ventilated, rainproof warehouses, avoiding contact with water. Adequate spacing between coils must be maintained to prevent deformation from compression. Surfaces may be coated with rust-preventive oil or film to enhance corrosion resistance. During transport, waterproof tarpaulins should cover the coils to prevent rain and seawater exposure. Specialised transport equipment must be used to ensure secure fixation, avoiding rolling and collisions. For stainless steel cold-rolled coils, particular care is required to prevent contact with carbon steel to avoid electrochemical corrosion. Packaging integrity should be regularly inspected, with any damage addressed promptly.
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2025-09-15 09:58:14
Evaluating the quality of cold-rolled coils requires consideration of multiple indicators: surface quality (finish, defect presence), dimensional accuracy (thickness tolerance, width tolerance, flatness), mechanical properties (tensile strength, yield strength, elongation), chemical composition (compliance with standards), and internal structure (grain structure, inclusion content). The surface should exhibit no significant defects such as scratches, pitting, or oxidation discolouration; dimensional tolerances must fall within permissible ranges; mechanical properties must meet application requirements; and chemical composition must comply with the relevant grade specifications. Additionally, sheet form (e.g., waviness, sickle bending) impacts subsequent processing and constitutes a critical factor in quality assessment.
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2025-09-15 09:57:57
Cold-rolled coils generally range from 0.10mm to 3.0mm in thickness, with 0.30mm to 2.0mm being most common. Thinner gauges present greater production challenges, demanding higher standards of equipment and process control. Widths typically span 600mm to 1800mm, though customisation is available per client requirements. Excessively large or small widths increase production and processing complexity. In practical applications, different industries have varying specification requirements. For instance, the home appliance sector commonly uses thin gauges of 0.3mm to 0.8mm, while the automotive industry employs thicknesses ranging from 0.5mm to 2.0mm depending on component specifications.
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2025-09-15 09:57:34
Owing to their smooth surface finish, high dimensional accuracy, and stable mechanical properties, cold-rolled coils find extensive application across multiple sectors. Within the automotive industry, they are employed in manufacturing body panels, doors, and chassis components; in the household appliance sector, they form the casings and internal structural parts of refrigerators, washing machines, and air conditioners; in electronics manufacturing, they serve as enclosures and heat sinks for electronic devices; In architectural decoration, they form curtain walls, ceilings, doors, and windows; within metal goods manufacturing, they produce various stamped components and hardware fittings. With advances in material technology, high-strength and ultra-thin cold-rolled coils are increasingly applied in new energy vehicles and equipment manufacturing sectors.
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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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2025-09-15 09:37:24
Replacement should be undertaken promptly when castors exhibit severe wear, cracks, deformation, bearing damage, difficult steering, or brake failure. Regular inspections prevent equipment damage or safety incidents caused by faulty castors.
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2025-09-15 09:37:10
Colours typically denote material or application, such as blue polyurethane wheels or grey rubber wheels. Certain industries also employ colour-coding for equipment classification management.
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2025-09-15 09:35:03
Under normal usage conditions, castors can last 3 to 5 years or even longer. Service life is influenced by usage frequency, load capacity, environmental conditions, and maintenance practices.
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2025-09-15 09:32:53
Anti-tangle design prevents ropes, hair, and other debris from becoming entangled around the axle, avoiding interference with rolling and steering. This feature is particularly suitable for domestic and environmental applications.
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2025-09-15 09:32:39
Common mounting methods include threaded rod mounting, base plate mounting, pin mounting, and threaded hole mounting. Different mounting methods suit varying equipment structures and usage requirements.
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2025-09-15 09:32:16
Selecting resilient wheel materials (e.g., rubber, PU), ensuring level flooring, and appropriately increasing wheel diameter can all reduce vibration.
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2025-09-15 09:31:47
Manoeuvrability relates to bearing quality, wheel diameter, bracket structure, and load capacity. Lighter loads, larger wheel diameters, and superior bearings enhance turning flexibility.
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