Suitable for outdoor sheet metal parts, rust-proof housings, ventilation equipment, distribution boxes, brackets, protective covers, architectural hardware, and medium- to low-cost sheet metal structural parts requiring good basic corrosion resistance.
Hot-dip galvanized steel sheet - SGCC is a sheet metal material made from steel sheets as the base material, formed by hot-dip galvanizing to form a thick zinc layer on the surface, offering good rust resistance, weather resistance, and cost advantages. It is commonly used in outdoor equipment enclosures, ventilation ducts, brackets, chassis cabinets, distribution boxes, protective covers, construction hardware, agricultural equipment, and sheet metal parts requiring basic outdoor corrosion resistance. Compared to SPCC cold-rolled plate, SGCC has better corrosion resistance; Compared to SECC electrogalvanized sheets, SGCC zinc layers are usually thicker, making them more suitable for outdoor and humid environments; Compared to stainless steel, SGCC is less expensive, but its appearance refinement and long-term corrosion resistance are still inferior to stainless steel.
By focusing on application scenarios, boundaries of advantages, and non-recommended scenarios, it helps sales, customer service, and quoting staff quickly determine whether the material meets current part requirements.
It has good rust resistance, better weather resistance than ordinary cold-rolled sheets, strong zinc layer protection, lower cost than stainless steel, suitable for outdoor environments, bending and stamping, suitable for batch sheet metal fabrication, can be sprayed with powder and paint to further enhance protection, and is suitable for equipment casings and bracket parts.
Outdoor equipment housings, distribution boxes, electrical control boxes, ventilation ducts, protective covers, equipment brackets, mounting plates, connection boards, building hardware, agricultural equipment parts, air conditioning and ventilation components, chassis cabinets, equipment base plates, enclosure components, rack accessories, pipe brackets, and ordinary outdoor sheet metal structural parts.
High-end fine appearance parts, highly corrosive environment parts, seaside high-salt spray long-term exposed parts, food direct contact parts, medical implant parts, strong acid and strong alkali environment parts, high-strength load-bearing parts, high wear-resistant moving parts, high-temperature long-term use parts, stainless steel brushed appearance parts, high-end parts requiring long-term maintenance-free corrosion resistance.
The following parameters come from product information and material knowledge fields, used for design review, quotation communication, and preliminary judgment before material selection.
| Material positioning | Suitable for outdoor sheet metal parts, rust-proof housings, ventilation equipment, distribution boxes, brackets, protective covers, architectural hardware, and medium- to low-cost sheet metal structural parts requiring good basic corrosion resistance. |
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| Precision performance | SGCC is suitable for laser cutting, CNC punching, bending, riveting, spot welding, and general sheet metal fabrication. The cutting profile and hole position accuracy are relatively good. The overall dimensions after bending are affected by plate thickness, bending radius, bend springback, zinc layer condition, number of bendings, and equipment precision. Multi-bend parts, welded parts, and large-size housing components require control of cumulative errors and deformation. Precision hole positions, positioning surfaces, and assembly surfaces are recommended to have separate tolerance control. |
| Dimensional tolerances | Dimensional tolerances for standard laser cutting can be referenced as ± 0.10mm to ±0.30mm; the overall dimensional tolerance after bending can be referenced as ±0.30mm to ±1.00mm; welded structural parts can be evaluated at ±0.50mm-±2.00mm. Small-sized simple bent parts are usually easier to control, while large, multi-bend, welded, and sprayed parts may have greater deviations. These values are standard reference ranges and do not guarantee absolute tolerances for all structures. Actual values should be confirmed based on plate thickness, zinc layer, dimensions, number of bendings, welding method, and surface treatment. |
| Minimum Wall Thickness | SGCC is usually selected based on plate thickness, with common thicknesses including 0.5mm, 0.8mm, 1.0mm, 1.2mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm, and so on. For ordinary enclosures, the recommended board thickness should be no less than 0.8mm-1.0mm; for small panels, 0.5mm-0.8mm can be used; for areas requiring welding, riveting, tapping, bearing assembly forces, or structural support, it is recommended to increase thickness appropriately. |
| Recommended wall thickness | For ordinary equipment, housings, protective covers, and ventilation components are recommended 0.8mm-1.5mm; outdoor distribution boxes, chassis, cabinets, brackets, and mounting boards are recommended 1.0mm-2.0mm; positions bearing assembly force, screw tightening, riveting, or medium loads are recommended 1.5mm-3.0mm, and rigidity is improved through folding, flanging, pressing, reinforcing ribs, or welded frameworks. |
| Minimum aperture | For laser cutting or CNC punching, the recommended hole diameter should be no less than one of the plate thickness, and for stable design, the hole diameter should be no less than 1.0mm-1.5mm. Small holes, dense holes, and holes near bending lines in thick plates are prone to deformation, burrs, or slag accumulation. Screw holes, positioning holes, riveting holes, and assembly holes should be reasonably allowable according to plate thickness, fastener specifications, zinc layer thickness, spraying thickness, and processing method. |
| Assembly clearance | For ordinary sheet metal assembly, it is recommended to reserve 0.20mm-0.50mm on one side; for insertion, flanging, slot, and multi-bend combination structures, it is recommended to appropriately enlarge the gap according to plate thickness, bending error, zinc layer thickness, and spraying thickness. Welded structural components should reserve greater assembly adjustment space based on welding deformation. If powder, painting, electrophoresis, or sealing treatment is needed later, additional consideration should be given to coating thickness to avoid over-tight assembly, paint scraping, or interference from hole positions. |
| Detailed performance | SGCC sheet metal is suitable for making holes, grooves, folded edges, flanges, pressed ribs, counterbos, louver holes, reinforcing ribs, welded structures, stamped structures, and standard sheet metal markings. Passing through small holes, sharp corners, and narrow bridges requires consideration of burr cutting, stamping deformation, bending cracking, and processing costs. Text, logos, and labels are recommended to be achieved through laser marking, stamping, silkscreen printing, inkjet printing, etching, or nameplates; it is not recommended to design overly fine mechanical cutting text on thin plates. |
| Surface effect | The original surface of SGCC is usually silver-gray, light gray, or galvanized with zinc patterns, giving it a distinct industrial rust-proof texture. The hot-dip galvanized surface may have zinc spots, color differences, textures, and local changes in brightness and darkness. It is suitable for functional parts and ordinary outdoor parts, but not suitable for high-end fine exterior parts to be exposed directly. If uniform color and better appearance are needed, powder spraying, painting, or electrophoresis treatments can be performed. |
Based on material characteristics and suitable product ranges, customer needs are broken down into easier application directions to determine.
Outdoor equipment housings, distribution boxes, electrical control boxes, ventilation ducts, protective covers, equipment brackets, mounting plates, connection boards, building hardware, agricultural equipment parts, air conditioning and ventilation components, chassis cabinets, equipment base plates, enclosure components, rack accessories, pipe brackets, and ordinary outdoor sheet metal structural parts.
Suitable for outdoor sheet metal parts, rust-proof housings, ventilation equipment, distribution boxes, brackets, protective covers, architectural hardware, and medium- to low-cost sheet metal structural parts requiring good basic corrosion resistance.
The main feature of SGCC hot-dip galvanized steel sheet is a relatively thick surface zinc layer, which provides sacrificial anodic protection for the steel plate substrate, making its corrosion resistance significantly superior to ordinary SPCC cold-rolled sheets and most electro-galvanized sheets. It is suitable for sheet metal parts in outdoor, humid, and general industrial environments. However, hot-dip galvanized surfaces usually have zinc spots, zinc layer textures, or color differences, and their appearance is less refined than cold-rolled sheet powder coating, stainless steel brushing, or aluminum alloy oxide parts. Cut edges, welded areas, and grinding zones can still damage the zinc layer and require additional protection.
Based on wall thickness, hole position, assembly clearance, dimensional tolerances, and material usage risks, determine in advance whether the part structure is suitable for SGCC Galvanized Steel Sheet.
Post-processing of SGCC Galvanized Steel Sheet affects appearance, dimensions, hole position, assembly clearance, and usage validation results, and should be explained in advance during quotation, DFM review, and sample confirmation stages.
Post-processing should focus on appearance display, dimensional fitting, connection assembly, and testing verification. Parts involving assembly positions need to be reserved in advance for machining, coating, and trial assembly allowances.
For common issues such as threads, snaps, strength, temperature resistance, and weather resistance, identify in advance whether the material needs to be replaced or if another processing method should be used.
When customer demand exceeds SGCC Galvanized Steel Sheet material boundaries, it is necessary to combine strength, temperature resistance, toughness, long-term stability, and mass production goals to promptly recommend alternative materials or processing technologies.
If better surface flatness and indoor chassis appearance are needed, SECC electrogalvanized sheets or SPCC powder coating can be chosen; If higher corrosion resistance is required,304 Stainless Steel, 316, or aluminum alloy powder spraying parts can be chosen; If lighter weight is needed, 5052 aluminum alloy or 6061 aluminum alloy can be chosen; If higher strength is required, Q235, Q345, or high-strength steel plates can be selected for surface protection; If long-term use with high salt spray or seaside conditions is required, priority should be given to evaluating heavy anti-corrosion coatings of 316 stainless steel or aluminum alloy, or specialized anti-corrosion materials.
If customers need ordinary outdoor rust prevention, cost control, and batch sheet metal fabrication, SGCC hot-dip galvanized steel sheets are a more suitable choice. If the product is used for indoor or exterior casings and fine spraying appearance is important, SECC or SPCC powder coating may be easier to control the appearance. If the product is long-term in seaside, salt spray, severe corrosion, or high-end weather-resistant scenarios, it is not recommended to rely solely on the zinc layer of SGCC itself. Instead, powder coating, painting, edge banding, or switching to higher-grade materials such as stainless steel or aluminum alloy should be added.
After uploading 3D/2D drawings and supplementing materials, quantities, tolerances, surface treatments, and delivery requirements, XPartsLab will provide next steps in 3D printing manufacturability, cost, and delivery pathways.
