Sand blasting (unified matte texture)
It is suitable for the "removal/anti-reflection" needs of cosmetic parts and assembly parts; it is also often used as a pre-treatment for subsequent brushing, polishing or marking processes.
304 Stainless Steel
304 Stainless Steel is the most commonly used general-purpose austenitic stainless steel, with advantages such as "corrosion resistance and stability, easy material acquisition, and good surface appearance."
Quote checklist: Upload your 3D model and, when available, a 2D drawing. Identify the required process, material, quantity, critical dimensions, finish, appearance standard, and target delivery date.
Key Material and Manufacturing Parameters
Engineering note: Values below are typical reference ranges. Final manufacturability, tolerances, material condition, surface finish, cost, and lead time depend on the drawing, geometry, quantity, and selected process.
Upload CAD files and mark critical features for an engineering review before production.
| Process | CNC machining (stainless steel 304) |
|---|---|
| Material | Stainless steel 304 (general corrosion resistance, the most widely used; suitable for structural parts/cosmetic parts/connectors) |
| Machining tolerance | ±0.2 mm (common diameter; it is recommended to mark the tolerance or note "precision first" for key holes/critical surfaces) |
| Minimum wall thickness | ≥ 1.0 mm (Thin-walled areas are recommended to be reinforced/thickened or undergo DFM review in advance) |
| Service temperature | 300–600℃ (related to service conditions/duration; please note the working conditions if the temperature is high for a long time) |
| Tensile strength | 450–1100 MPa (related to heat treatment status/feed batch; please note if you need to specify the status) |
| Density | 7.7–8.5 g/cm³ |
| Surface roughness (reference) | Ra 0.8–3.2 μm (varies with process and tool path; mirror/electrolytic polishing can further enhance appearance) |
| Hole/Thread Recommendations | It is recommended to provide 2D marking for deep holes and small threads; for key mating holes, "reservation + reaming/finishing" is commonly used to achieve stable assembly. |
| Finishing | Sand blasting, wire brushing, polishing, electrolytic polishing, passivation, laser engraving |
| Typical lead time | Relevant to structural complexity, quantity, surface finishing and quality inspection standards; clear delivery and expedited options will be given after uploading the file |
Finishing
Brushed (directional appearance)
Commonly used in panels, shells and exterior structural parts. It is recommended to note the drawing direction, texture thickness and appearance range to avoid visual inconsistency.
Polished (high-gloss appearance)
Suitable for cosmetic parts that require "glossy texture"; it is recommended to define the mirror range and allowable fine grain standards to facilitate consistent delivery.
Electropolishing (more uniform finish)
It is more friendly to complex curved surfaces and inner corner areas, and can achieve a more consistent appearance and lower surface residue. It is often used for high-quality cosmetic parts.
Passivation (improving corrosion resistance consistency)
Parts suitable for humidity, salt spray or more sensitive environments; it is recommended to indicate in the remarks the usage conditions and whether stricter corrosion resistance requirements are required.
Laser engraving (identification and traceability)
Suitable for identification such as serial numbers, logos, scales and QR codes; it is recommended to provide vector files, position size and contrast requirements.
Why Choose Stainless Steel 304 (CNC Machining)
Universal corrosion resistance, the widest range of applications
It performs stably in humid/oily/general chemical media environments, and is a commonly used stainless steel with a good balance of "corrosion resistance + cost + availability".
Reliable strength and durability
Suitable for long-term use scenarios of structural parts and connectors; more stable assembly and load-bearing requirements, suitable for end-use parts delivery.
The appearance can be made into a high-end texture
It supports brushing, polishing and electrolytic polishing, and can be flexibly selected from matte to high-gloss, suitable for cosmetic parts and visible parts.
Mature finishing system
Sandblasting/passivation/radium engraving and other mature combinations are easy to achieve consistent appearance and corrosion resistance standards, and take into account traceability requirements.
Recommended Applications
- General corrosion resistance requirements: Structural parts/connectors in environments with moisture, oil stains, and general corrosive media
- Appearance texture parts: Requires brushing/polishing/electrolytic polishing to present a high-grade metal texture
- Long-term use terminal pieces: Deliverable parts that require durability and stability
- traceability identification: Need laser engraving serial number, logo, scale and other information
It is not recommended to use it directly (it is recommended to change materials/processes)
- Strong salt spray/seaside/stronger corrosion: Prioritize evaluation of 316/316L or stricter passivation standards
- Extremely high temperature and long-term service: It is recommended to choose a more matching heat-resistant alloy system according to the working conditions.
- Extreme lightweight priority: Can evaluate lower density materials such as aluminum alloy/titanium alloy
- Ultra-large batch size and stable shape: Can evaluate mass production routes such as stamping/casting/injection molding inserts to reduce costs
Design and DFM Guidelines
- Thin wall and deformation control: It is recommended to reinforce/thicken areas with thin walls (close to the minimum wall thickness) and avoid large areas of thin plates; if necessary, conduct a DFM review first to determine the clamping plan.
- Deep hole/long slot manufacturability: Deep holes and narrow grooves will significantly increase the difficulty and cost of processing; it is recommended to clarify the accuracy of key hole positions in the drawings and allow reasonable tool fillet and retraction space.
- Internal angle and tool radius: CNC internal corners usually leave rounded corners (tool radius); if a right angle is necessary, please use a "clear corner" structure or reserve process space.
- Threads and mounting holes: For small threads/deep threads, it is recommended to clarify the thread standard and effective thread length; for key mating holes, it is recommended to "reserve margin + reaming/finishing" to achieve stable fit.
- Appearance and surface finishing: For brushed/polished parts, the appearance surface, grain direction and acceptable fine lines must be defined; electrolytic polishing and passivation will affect the gloss and texture appearance. It is recommended to write down the goals clearly in the remarks.