Stainless Steel Parts Manufacturing

Precision stainless steel components via CNC Machining, Sheet Metal Fabrication, and Metal 3D Printing (SLM). Delivering extreme corrosion resistance, high tensile strength, and tight tolerances down to ±0.01 mm for demanding applications.

✅ All Design Uploads Are Secure & Confidential

Popular Stainless Steel Alloys & Specifications

Select the optimal stainless steel grade engineered for corrosion resistance, high tensile strength, or extreme temperature environments.

Alloy Grade	Primary Process	Key Characteristics & Advantages	Typical Applications
Stainless Steel 304 / 304L Industry Standard Austenitic	CNC Machining Sheet Metal	Most widely used stainless steel. Excellent atmospheric corrosion resistance, superior formability, and great weldability with low material cost.	Food processing equipment, kitchenware, electronic enclosures, general brackets.
Stainless Steel 316 / 316L Marine & Medical Grade	CNC Machining Sheet Metal	Contains molybdenum for superior pitting and chloride corrosion resistance. Highly suited for harsh chemical environments and medical sterilization.	Marine hardware, medical instruments, chemical processing pumps, pharmaceutical tanks.
Stainless Steel 17-4 PH Precipitation Hardening	CNC Machining	Chromium-copper precipitation hardening stainless steel delivering ultra-high yield strength, hardness, and high mechanical toughness after heat treatment.	Aerospace components, turbine blades, high-stress shafting, hydraulic valves.
Stainless Steel 303 Free-Machining Grade	CNC Turning	Specially sulfur-alloyed non-magnetic austenitic stainless steel designed for maximum CNC machinability, fast chip breaking, and smooth surface finishes.	Screws, nuts, high-volume threaded fasteners, gears, bushings.
Stainless Steel 420 / 416 Martensitic Hardenable	CNC Machining	Martensitic alloy capable of heat treatment to attain high hardness and wear resistance, while maintaining magnetic properties and fair machinability.	Surgical cutlery, valve stems, pump shafts, wear-resistant mechanical parts.
316L Powder Additive Manufacturing	3D Printing (SLM)	Stainless steel metal powder optimized for SLM 3D printing. Enables complex topological weight-reduced structures with high corrosion resistance.	Custom medical implants, organic fluid manifolds, complex cooling dies.

Mechanical & Physical Property Comparison

Property	SS 304 (General Purpose)	SS 316 (Marine Grade)	17-4 PH (High Strength)	SS 303 (Free Machining)
Tensile Strength	515–620 MPa	515–620 MPa	1100–1300 MPa	500–620 MPa
Yield Strength	205–290 MPa	220–290 MPa	1000–1170 MPa	230–290 MPa
Hardness (Brinell)	123–180 HB	146–190 HB	330–400 HB	160–200 HB
Elongation at Break	40–60%	40–50%	10–15%	35–50%
Density	8.00 g/cm³	8.00 g/cm³	7.75 g/cm³	8.00 g/cm³
Machinability Rating	Fair (45%)	Fair (45%)	Good (45–50%)	Excellent (75%)

Surface Finishes for Stainless Steel

Choose from a broad spectrum of surface treatments designed to enhance passivation, corrosion resistance, surface roughness, and aesthetic lusters.

As-Machined

Clean raw surface straight from CNC machining with minor tool marks. Offers Ra 0.8–3.2 µm surface roughness while retaining tight dimensional tolerances.

Passivation (ASTM A967)

Chemical citric/nitric acid treatment that removes free iron contaminants from the surface, enhancing the natural chromium oxide passive layer to maximize corrosion resistance.

Electropolishing

Electrochemical deburring process that removes micro-peaks from the surface, creating an ultra-smooth, mirror-like finish that prevents bacterial adhesion for medical & food parts.

Bead Blasting

Uses fine glass beads to strip surface impurities, producing a uniform, non-reflective matte satin texture that conceals minor machining lines.

PVD & Powder Coating

Physical Vapor Deposition (PVD) applies extreme-hardness metallic coatings (Titanium Nitride - TiN, Gold, Black) for high wear resistance and luxury cosmetic hardware.

Brushed / Mirror Polishing

Abrasive wheel finishing delivering satin line textures (No. 4 finish) or bright mirror reflections (No. 8 finish) for architectural and medical applications.

Advantages and Considerations of Stainless Steel Machining

Stainless steel is highly valued across critical industries for its strength and corrosion resistance. Review its key mechanical pros and manufacturing limitations below.

✓

Advantages of Stainless Steel

Superior Corrosion & Chemical Resistance: Forms a self-healing chromium oxide film that resists rusting in marine, chemical, and outdoor weathering conditions.
High Tensile Strength & Toughness: Delivers robust structural strength and mechanical durability under extreme mechanical load and high-pressure conditions.
Extreme Temperature Endurance: Maintains structural integrity and oxidation resistance at high operating temperatures and cryogenic environments.
Hygienic & Easy to Sanitize: Non-porous surface that easily survives harsh cleaning chemicals, ideal for medical implants, food processing, and pharmaceuticals.

Considerations & Limitations

Work Hardening during Machining: Austenitic grades (e.g., 304/316) work-harden rapidly, requiring lower cutting speeds, heavy feeds, and rigid tooling.
Higher Tool Wear & Machining Cost: Tougher material properties increase cutter wear and lead times compared to aluminum and brass alloys.
Higher Density & Weight: Relatively heavy metal (~8.0 g/cm³), making it less suitable for applications prioritizing extreme light-weighting.

Stainless Steel Parts Manufacturing FAQs

1. What is the difference between Stainless Steel 304 and 316 for custom components?

SS 304 is the cost-effective general-purpose standard suitable for everyday enclosures and structural parts. SS 316 contains 2–3% Molybdenum, providing significantly higher corrosion resistance against salt spray, marine environments, harsh chemicals, and medical sterilization.

2. Why is passivation recommended for stainless steel machined parts?

CNC machining can leave microscopic iron particles from cutting tools embedded in the stainless steel surface, leading to localized rusting. Passivation (per ASTM A967) chemically removes free iron and enriches the passive chromium layer to maximize long-term corrosion resistance.

3. How do you manage work hardening and tool wear when machining 304/316 stainless steel?

Austenitic stainless steel work-hardens under high temperatures. We utilize rigid 5-axis CNC equipment, custom carbide tools with TiAlN coatings, low cutting speeds, heavy feeds, and high-pressure coolant to prevent work hardening and achieve precise tolerances.

4. Which stainless steel grade is best for high-strength, high-hardness shafting or structural parts?

Stainless Steel 17-4 PH is ideal. It can be precipitation heat-treated to achieve tensile strengths up to 1300 MPa and hardness up to 40 HRC while retaining good corrosion resistance.

5. What tolerances can you hold for precision CNC turned stainless steel fittings?

Standard tolerances are ±0.05 mm (±0.002") per ISO 2768-m. For precision critical shafts, bearing fits, and internal threads, we routinely achieve tight tolerances down to ±0.01 mm (±0.0004").