1. Can cold-rolled coils really be used to make appliance stands?
Yes, cold-rolled coils are a common and mature material for producing appliance stands.
Cold-rolled steel sheets are widely used in the home appliance, chassis, and cabinet industries. They are commonly used to manufacture equipment stands, machine stands, and cabinet stands, components that directly determine the stability and durability of the equipment.
In specific applications, cold-rolled coils have a long history of being used for stands. For example, washing machine stands and internal support components for refrigerators in the home appliance industry are typical applications of cold-rolled steel.
2. What are the advantages and disadvantages of using cold-rolled coils for appliance bases?
✅ Advantages
Cost Advantage: Cold-rolled steel sheets are relatively inexpensive, offering good cost-effectiveness. The price of ordinary cold-rolled steel is approximately half that of special steel, effectively reducing production costs.
Excellent Processing Performance: Cold-rolled steel is easy to cut, bend, stamp, and weld, making it ideal for manufacturing bases requiring complex shapes. This results in high production efficiency and suitability for mass production.
High Dimensional Accuracy: Due to room temperature rolling, cold-rolled steel sheets exhibit excellent dimensional accuracy (such as thickness tolerance) and surface flatness, meeting the requirements of precision assembly.
Good Surface Quality: The smooth surface of cold-rolled steel sheets makes them an ideal substrate for subsequent surface treatments such as painting and electroplating, resulting in a superior appearance.
Disadvantages
Poor Corrosion Resistance: This is the most significant disadvantage of cold-rolled steel sheets. Without protective treatment, cold-rolled steel is highly susceptible to rust in humid environments.
Requires Surface Treatment: Due to its susceptibility to rust, all cold-rolled steel sheets used for bases must undergo surface treatment, such as electrostatic powder coating or spraying; otherwise, the product's lifespan will be significantly shortened.
Limited Applications: Its weak rust resistance makes it unsuitable for outdoor, humid, or long-term corrosion-resistant electrical equipment. In these environments, galvanized steel or stainless steel is recommended.
3: Why choose cold-rolled steel sheet compared to other materials?
For appliance bases in indoor environments, where cost is a concern, and where a painting process is involved, cold-rolled steel sheet is a highly cost-effective choice. If the base needs to be exposed to humid air for extended periods, galvanized steel sheet or stainless steel should be given priority.
4. What key points should be considered when selecting materials and processing them?
When using cold-rolled coils to manufacture appliance bases, the following points should be noted:
Material Selection:
Grade Selection: The most commonly used grade is SPCC (commercial-grade cold-rolled steel sheet). For bases requiring complex stamping or stretching, SPCD, which offers better formability, can be selected.
Thickness Requirements: The appropriate thickness should be selected based on the weight the base needs to bear and the structural design. Common thickness ranges are between 1.0mm and 3.0mm.
Standard Requirements: China has a specific national standard for cold-rolled steel sheets and strips for home appliances (GB/T 30068-2025), which clearly stipulates the technical requirements.
Processing Technology:
Stamping and Bending: Cold-rolled steel sheets are ideal for stamping and bending, allowing for efficient fabrication of the desired base shapes.
Welding Performance: Cold-rolled steel sheets have good weldability. However, it's important to note that welding may damage the surface rust-proofing layer; therefore, welded areas must undergo subsequent rust-proofing treatment.
Surface Treatment (Critical):
Mandatory: To prevent rust, all cold-rolled steel bases must undergo surface treatment, such as electrostatic powder coating or painting. This is standard practice in the industry.
Timing: Surface treatment should be performed after all machining processes (stamping, bending, welding) are completed to ensure that all exposed metal surfaces are covered.
5. What are the industry trends? What are the prospects for cold-rolled steel sheets in appliance bases?
The application of cold-rolled steel coils in appliance bases is showing a trend of differentiation, with the overall market space being squeezed by higher-grade materials.
Low-end market still using it: Currently, the application of ordinary cold-rolled steel in the home appliance field is being compressed into low-value-added products, such as the bases of low-end washing machines and internal support components of entry-level refrigerators. In these areas, cost is the primary consideration.
High-end market is being replaced: As home appliances transform towards high-end and intelligent products, higher requirements are being placed on material performance. For example, the tolerance accuracy requirement for steel in high-end home appliances has increased to ±0.005mm, while the accuracy of ordinary cold-rolled steel is only ±0.02mm, which is difficult to meet. This has led to cold-rolled steel being gradually replaced by high-performance galvanized sheets, color-coated sheets, or higher-quality special cold-rolled steel in high-end products.
Material upgrading is the trend: Home appliance manufacturing is developing towards lightweighting and high corrosion resistance. To meet these new requirements, manufacturers are beginning to adopt more new materials. For example, Baosteel has developed a paint-free aluminum-zinc-magnesium product for use in air conditioner outdoor unit chassis, replacing the traditional "hot-dip galvanizing + spraying" process. Handan Iron and Steel Group has also taken the lead in introducing aluminum-zinc-magnesium coated steel sheets into the home appliance manufacturing field.