SUS304 CNC Machining – Precision Stainless Steel Parts with Excellent Corrosion Resistance
SUS304 (equivalent to AISI 304) is the most widely used austenitic stainless steel. It offers excellent corrosion resistance, good formability, high strength, and outstanding machinability. At Ranglink, we specialize in CNC machining of SUS304 for prototypes and production runs – from food-grade components to medical devices and industrial parts.
🔧 Why choose SUS304 for CNC machining?
– Outstanding resistance to a wide range of corrosive environments.
– Non‑magnetic in annealed condition (slightly magnetic after cold working).
– Good weldability and excellent surface finish.
– Wide operating temperature range (–196°C to 800°C).
– Available in bars, sheets, and custom extrusions.
– Outstanding resistance to a wide range of corrosive environments.
– Non‑magnetic in annealed condition (slightly magnetic after cold working).
– Good weldability and excellent surface finish.
– Wide operating temperature range (–196°C to 800°C).
– Available in bars, sheets, and custom extrusions.
Key Properties of SUS304 (AISI 304) Stainless Steel
| Property | Value / Rating |
|---|---|
| Tensile strength (annealed) | ~520–750 MPa |
| Yield strength (annealed) | ~205 MPa (typical) |
| Elongation (annealed) | ≥ 40% |
| Hardness (Brinell, annealed) | ~123–200 HB | Density | 7.93 g/cm³ |
| Corrosion resistance | Excellent (acids, alkalis, chlorides up to moderate concentration) |
| Machinability rating | ~70% of 1212 steel (use sharp carbide tools & coolant) |
| Weldability | Excellent (most standard methods) |
| Magnetic response | Non‑magnetic (annealed); slightly magnetic after cold work |
💡 Machining tips: SUS304 work‑hardens quickly. Use sharp carbide tools, adequate coolant, and avoid lingering cuts. Maintain consistent feed rates to prevent surface hardening. For best results, use positive rake geometry tooling.
Our CNC Machining Capabilities for SUS304 Stainless Steel
| Parameter | Specification |
|---|---|
| Max part size (milling) | 1100 × 600 × 500 mm |
| Max turning diameter | Ø230 mm |
| Standard tolerance | ±0.05 mm |
| Precision tolerance | ±0.005 mm (on request) |
| Surface roughness (as machined) | Ra 1.6 μm (down to Ra 0.4 μm with finishing) |
| Lead time (prototypes) | 3 business days |
Processes available: CNC Turning · CNC Milling (3‑axis, 4‑axis, full 5‑axis) · CNC Drilling & Tapping · EDM · Surface grinding.
Surface Treatment & Post-Processing for SUS304
Passivation (removes free iron, enhances corrosion resistance)
Electropolishing (bright, smooth surface)
Bead Blasting (uniform matte finish)
Brushing (linear grain pattern)
Laser Marking (permanent logos, serial numbers)
Silkscreen (printed text/graphics)
Medical‑grade cleaning / passivation
Note: SUS304 naturally forms a passive oxide layer. Passivation further accelerates this process and is recommended for food/medical applications.
Common Applications of CNC Machined SUS304
🍴 Food Industry – tanks, conveyors, mixers, cutting blades
🏥 Medical – surgical instruments, implantable device components, sterilization trays
🏭 Chemical & Pharmaceutical – valves, fittings, reactor components
🚗 Automotive – exhaust parts, trim, fuel system components
🏠 Architectural – handrails, cladding, decorative panels
⚡ Electronics – battery enclosures, EMI shields, connectors
Quality Assurance
- ISO 9001:2015 certified – audited quality management system.
- Full traceability – material certificates (EN 10204 3.1) and inspection reports.
- Inspection equipment – CMM, optical comparator, hardness tester, surface roughness tester.
- Every part inspected – we ensure dimensional accuracy, surface finish, and corrosion resistance requirements.
Why Choose Ranglink for SUS304 CNC Machining?
No Minimum Order
From 1 piece to high volume
Fast Lead Times
Prototypes in 3 days
24h Quote
Send CAD, get quote in one working day
Stainless Steel Expertise
Coolant and toolpath strategies to prevent work hardening
Transparent Pricing
No hidden fees
Ready to Start Your SUS304 CNC Project?
👇 Upload your CAD file (STEP, IGES, STL, SolidWorks) for a free quote within 24 hours.
📧 info@ranglink.com | 🌐 www.ranglink.com | 📱 WhatsApp: +86 17338532394