Suitable for general metal structural parts, food equipment parts, decorative parts, hardware parts, sheet metal parts, CNC machined parts, and medium-grade corrosion-resistant scenarios.
304 Stainless Steel is a commonly used austenitic stainless steel material with good corrosion resistance, oxidation resistance, toughness, weldability, and overall mechanical properties. It is one of the most widely used stainless steel materials, commonly used in mechanical parts, hardware components, food equipment parts, medical device housings, decorative parts, structural components, sheet metal housings, and daily-use metal products. Compared to 316L stainless steel, 304 is generally less expensive and more versatile, but its corrosion resistance in seawater, salt spray, chloride ions, and highly corrosive environments is inferior to 316L.
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 corrosion resistance, stable overall performance, good toughness, good weldability, wide application, cost below 316L, and a variety of surface treatment methods, suitable for CNC machining, sheet metal fabrication, welding, and polishing.
Food equipment parts, kitchen equipment parts, mechanical structural parts, hardware accessories, sheet metal housings, instrument housings, medical device housings, decorative parts, brackets, connectors, valve fittings, pump body parts, fasteners, fixtures and fixtures, daily-use metal products, and ordinary corrosion-resistant structural parts.
Long-term contact parts of seawater, high salt spray environments, strong acids and alkalis, chloride ion corrosion environments, medical implants, ultra-high strength load-bearing parts, extremely high hardness wear-resistant parts, high thermal conductivity parts, high electrical conductivity parts, parts requiring strong magnetic properties, and structural parts that are extremely sensitive to weight.
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 general metal structural parts, food equipment parts, decorative parts, hardware parts, sheet metal parts, CNC machined parts, and medium-grade corrosion-resistant scenarios. |
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| Precision performance | 304 Stainless Steel suitable for CNC machining, turning, milling, wire cutting, laser cutting, sheet metal bending, stamping, and welding processes. CNC machining can achieve higher dimensional accuracy and better surface quality; The accuracy of sheet metal parts is affected by plate thickness, bending springback, welding deformation, and surface treatment. Compared to 303, 304 is more difficult to machin; Compared to 316L, 304 is generally slightly easier to process and more cost-effective. |
| Dimensional tolerances | Conventional dimensional tolerances for CNC machining 304 Stainless Steel can be referenced as ± 0.02mm to ±0.10mm, while ordinary structural parts can be evaluated at ± 0.10mm to ±0.20mm; The sheet metal cutting dimensional tolerances can refer to ±0.10mm-±0.30mm, and after bending and forming, the overall dimensional tolerance can refer to ±0.30mm-±0.80mm. These values represent the standard reference range and are not absolute guaranteed tolerances for all structures; actual confirmation must be made based on process, dimensions, structure, and post-processing. |
| Minimum Wall Thickness | The wall thickness of ordinary CNC machining structures is recommended not less than 0.8mm-1.0mm; for thin-walled parts, consideration must be given to the risks of machining deformation and clamping; Common sheet metal thicknesses range from 0.5mm, 0.8mm, 1.0mm, 1.5mm to above 3.0mm. Long-term stress, welding, tapping, or pressure-bearing structures should be appropriately thickened. |
| Recommended wall thickness | Standard CNC structural parts are recommended to be above 1.0mm-3.0mm; load-bearing structures, mounting seats, screw posts, and welding positions are recommended to be above 2.0mm; ordinary sheet metal shells are recommended to be 0.8mm-2.0mm; chassis, brackets, and protective covers are recommended to be 1.2mm-3.0mm, and rigidity is enhanced by combining folded edges, reinforcement ribs, and welded structures. |
| Minimum aperture | CNC machining can achieve relatively small hole diameters, but deep small holes are more challenging; general designs recommend hole diameters not less than 1.0mm. For sheet metal laser cutting or punching, the recommended aperture diameter should not be less than one time the plate thickness, and for stable design, it should not be less than 1.0mm-1.5mm. It is recommended to reserve machining allowance for precision holes, threaded holes, positioning holes, and assembly holes, and to process after drilling, reaming, or tapping if necessary. |
| Assembly clearance | For precision metal assembly, 0.02mm-0.10mm per side can be reserved according to fitting requirements; for ordinary insertion and assembly, 0.10mm-0.30mm is recommended for one side; for sheet metal assembly, 0.20mm-0.50mm is recommended for one side. If subsequent polishing, sandblasting, passivation, electrolytic polishing, painting, or welding are required, the assembly allowance should be increased in conjunction with surface treatment and deformation effects. |
| Detailed performance | 304 stainless steel is suitable for achieving holes, grooves, steps, threads, chamfers, curved surfaces, brushed textures, stamped structures, bent structures, and welded structures. CNC machining details are clear, and the edges and assembly surfaces are of good quality; Sheet metal parts are suitable for making holes, edges, flanges, ribs, and panel structures. Small text, logos, and labels are recommended to be achieved through laser marking, etching, silkscreening, or engraving. |
| Surface effect | The original processed surface of 304 stainless steel usually has a silver-white or gray-silver metallic texture. It can machine textures, brushed surfaces, sandblasted matte surfaces, mirror polishing, electrolytic polishing, and passivation surfaces. Mirror polishing is suitable for decorative and high-end appearance parts; brushing is suitable for home appliances, panels, and industrial product appearances; sandblasting is suitable for a low-key matte texture; passivation and electrolytic polishing are better suited for food equipment, medical device housings, and corrosion-resistant scenarios. |
Based on material characteristics and suitable product ranges, customer needs are broken down into easier application directions to determine.
Food equipment parts, kitchen equipment parts, mechanical structural parts, hardware accessories, sheet metal housings, instrument housings, medical device housings, decorative parts, brackets, connectors, valve fittings, pump body parts, fasteners, fixtures and fixtures, daily-use metal products, and ordinary corrosion-resistant structural parts.
Suitable for general metal structural parts, food equipment parts, decorative parts, hardware parts, sheet metal parts, CNC machined parts, and medium-grade corrosion-resistant scenarios.
304 Stainless Steel has good versatility and stability, capable of CNC machined parts, sheet metal parts, welded parts, stamped parts, and decorative parts. It has good corrosion resistance in ordinary indoor environments, humidity, food equipment, and general outdoor environments. The surface of 304 can achieve different appearances and protective effects through polishing, brushing, sandblasting, passivation, electrolytic polishing, and other methods. It is a very common material in industrial products and daily-use metal parts.
Based on wall thickness, hole position, assembly clearance, dimensional tolerances, and material usage risks, determine in advance whether the part structure is suitable for 304 Stainless Steel.
Post-processing of 304 Stainless Steel 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 304 Stainless Steel 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 higher corrosion resistance is required,316L Stainless Steel can be chosen; If better machinability is required,303 Stainless Steel can be chosen; If a spring, snap, or elastic structure is needed,301 Stainless Steel can be chosen; If higher strength and hardness are required, 17-4PH stainless steel, alloy steel, or mold steel can be chosen; If lightweight design is needed, you can choose 6061 Aluminum Alloy, 7075, or TC4 Titanium Alloy (Ti-6Al-4V); If only appearance verification is needed, aluminum alloy, photosensitive resin with metal paint or ordinary metal samples can be chosen.
If customers require general corrosion resistance, good metallic feel, good weldability, and stable overall performance,304 Stainless Steel is a more suitable choice. If customers need long-term seaside environments, salt spray, chemical media, or higher corrosion resistance, it is recommended to prioritize 316L. If customers mainly care about machining efficiency and the cost of small turnings, 303 can be considered; If customers mainly care about weight, aluminum or titanium alloys are more suitable.
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.
