Stainless Steel Parts Australia
Custom stainless steel machined parts in 304, 316, 316L, 17-4 PH, and all standard grades. Food grade, marine, medical, mining, and industrial applications. Managed supply from drawing to delivery.
Stainless Steel Grade Selection
Selecting the right stainless grade ensures corrosion resistance, machinability, and weldability match your application.
| Grade | Key Properties | Best Applications |
|---|---|---|
| 304 | General purpose, good corrosion resistance | Indoor equipment, tanks, general engineering |
| 304L | Low carbon — improved weldability | Welded assemblies where sensitisation is a concern |
| 316 | Molybdenum — superior chloride resistance | Marine, coastal, outdoor, chemical environments |
| 316L | Low carbon 316 — preferred for welding | Food grade, medical, pharmaceutical, welded marine parts |
| 303 | Free-machining — fastest to cut | High-volume turned parts, fittings (non-weldable) |
| 17-4 PH | Precipitation hardened — high strength | Aerospace, defence, high-load components |
| 2205 Duplex | High strength + chloride resistance | Subsea, oil and gas, high-pressure seawater |
Industries Using Stainless Steel Parts
Food & Beverage
316L stainless is the food industry standard. Fittings, impellers, valve bodies, processing equipment. CIP-compatible finishes, electropolish, and passivation managed in-house.
- ✓ 316L preferred
- ✓ Ra 0.8µm or better
- ✓ Electropolish available
- ✓ Passivation included
Marine & Mining
Marine-grade 316 resists saltwater and chloride attack. Pump components, instrumentation housings, structural fittings, and subsea components for Australian marine and mining applications.
- ✓ 316 and duplex 2205
- ✓ Saltwater resistant
- ✓ High-pressure rated
- ✓ Robust Australian conditions
Medical & Pharmaceutical
ISO 13485 certified suppliers for implant-grade and surgical-grade stainless components. 316L electropolished and passivated to biocompatibility standards. Full batch traceability.
- ✓ ISO 13485 suppliers
- ✓ 316L electropolished
- ✓ Full batch traceability
- ✓ Biocompatible finishes
Stainless Steel Parts FAQ
What stainless steel grades are available for machined parts in Australia?
We supply stainless steel parts in all standard grades: 304 (most common, general purpose, good corrosion resistance), 304L (low carbon, weldable), 316 (superior corrosion resistance with molybdenum, marine and chemical), 316L (low carbon 316, preferred for welding and medical), 303 (free-machining stainless, fastest to machine, not for welding), 17-4 PH (precipitation hardened, high strength), 15-5 PH (aerospace and defence), and duplex stainless 2205 (high strength, excellent chloride resistance).
What is the difference between 304 and 316 stainless steel for machined parts?
304 stainless is the standard grade — good corrosion resistance in most environments, cost-effective, widely available. 316 stainless adds 2–3% molybdenum, which significantly improves resistance to chloride corrosion (salt water, chlorine-based cleaning agents, marine environments). For outdoor Australian environments near the coast, marine applications, food processing with CIP cleaning, or chemical handling, specify 316 or 316L. For interior applications, food contact without harsh chemicals, or general engineering, 304 is usually sufficient.
Is 316L stainless steel suitable for food-grade applications?
316L is the preferred food-grade stainless steel in Australia. It meets FDA requirements for food contact, is resistant to CIP (clean-in-place) chemicals, and its low carbon content prevents carbide precipitation during welding — important for maintaining corrosion resistance at weld joints. For food processing equipment, brewing, dairy, pharmaceutical, and food-grade machined components, specify 316L with a specified surface finish (typically Ra 0.8µm or better electropolished). Passivation treatment can be included.
Why is stainless steel more expensive to machine than aluminium?
Stainless steel is harder, tougher, and generates more heat during machining than aluminium. This means slower cutting speeds, shorter tool life, higher tooling costs, and more coolant. Austenitic stainless steels (304, 316) work-harden during machining, requiring careful toolpath strategies to avoid hard spots that break tools. Machining cycle times for stainless are typically 3–5× longer than equivalent aluminium parts. Free-machining 303 stainless is significantly faster to machine than 304 or 316 and costs less per part — use it where weldability is not required.
What surface finishes are available for stainless steel parts?
Common stainless steel surface finishes: as-machined (Ra 1.6µm typical), bead blasted (uniform matte), brushed (#4 finish — 180 grit linear, common for food equipment), mirror polished (#8 — Ra 0.1µm or better), electropolished (removes surface layer, improves corrosion resistance, used for medical and food grade), and passivated (citric or nitric acid treatment to restore passive layer after machining). Surface finish callout on your drawing ensures the correct finish is applied.
Which industries use stainless steel machined parts in Australia?
Stainless steel machined parts are extensively used in: food and beverage processing (316L fittings, valves, impellers), pharmaceutical and biotech (316L with electropolish), marine and offshore (316 for saltwater resistance), mining (wear components, instrumentation, pump parts), medical devices (implants, surgical instruments, diagnostic equipment), oil and gas (high-pressure fittings, valve bodies), and chemical processing (corrosion-resistant process equipment). Australia's mining and food processing sectors are particularly large consumers of stainless machined parts.
Can you supply stainless steel parts with passivation included?
Yes. Passivation (citric acid or nitric acid treatment) is arranged through our finishing supplier network and included in the quote. Passivation restores the passive oxide layer that may be disrupted during machining, maximising corrosion resistance. For medical and food-grade applications, electropolishing followed by passivation is also available. Specify your finish requirement on your drawing or in your quote request.
What tolerances can be achieved on stainless steel machined parts?
Standard CNC machining of stainless steel achieves ±0.05mm on general features. High-precision machining holds ±0.01mm on critical dimensions. For ultra-tight tolerances, grinding after rough machining achieves ±0.005mm or better. Stainless steel requires careful management of work hardening and thermal expansion during precision machining. Specify critical tolerances explicitly on your 2D drawing — our engineering review will flag any concerns before quoting.
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