Precision CNC Machining for Stainless Steel
Expert CNC machining of 303, 304, 316, 17-4PH and specialty stainless steel grades. Tight tolerances, material certifications, and complete finishing services from prototype to production.
Stainless Steel Materials
We machine all major stainless steel grades, from standard 304 to high-performance 17-4PH and specialty alloys.
303
Austenitic - Free Machining
Added sulfur improves machinability. Ideal for complex parts requiring extensive machining.
- Excellent machinability
- Good corrosion resistance
- Non-magnetic
- Best for: Fittings, shafts, gears
304 / 304L
Austenitic - Food Grade
The most widely used stainless steel. 304L has lower carbon for improved weldability.
- Excellent corrosion resistance
- Food grade certified
- Non-magnetic
- Best for: Food equipment, tanks, housings
316 / 316L
Austenitic - Marine Grade
Added molybdenum provides superior corrosion resistance, especially in chloride environments.
- Superior corrosion resistance
- Marine & chemical resistant
- Medical grade available
- Best for: Marine, medical, chemical
416
Martensitic - Free Machining
Free-machining martensitic grade that can be hardened by heat treatment.
- Good machinability
- Heat treatable
- Magnetic
- Best for: Valves, pumps, tools
420
Martensitic - Free Machining
Can achieve high hardness through heat treatment. Good corrosion resistance when hardened.
- High hardness when heat treated
- Good wear resistance
- Magnetic
- Best for: Cutlery, surgical tools
440C
Martensitic - High Carbon
Highest hardness of all stainless grades. Excellent wear resistance for bearing applications.
- Maximum hardness: 60 HRC
- Excellent wear resistance
- Good corrosion resistance
- Best for: Bearings, valves, knives
17-4 PH
Precipitation Hardening
Combines high strength with good corrosion resistance. Heat treatable to various hardness levels.
- High strength (up to 1700 MPa)
- Good corrosion resistance
- Aerospace & medical approved
- Best for: Aerospace, medical, nuclear
2205
Duplex - High Performance
Combines austenitic and ferritic structures for superior strength and corrosion resistance.
- 2x strength of 316
- Superior stress corrosion resistance
- Cost effective vs. super duplex
- Best for: Oil & gas, chemical processing
Material Comparison Guide
Compare key properties to select the right stainless steel for your application.
| Grade | Corrosion Resistance | Machinability | Strength | Heat Treatable | Relative Cost |
|---|---|---|---|---|---|
| 303 | Good | Excellent | Moderate | NO | $ |
| 304 | Excellent | Good | Moderate | NO | $ |
| 316 | Superior | Good | Moderate | NO | $$ |
| 416 | Moderate | Excellent | Good | YES | $ |
| 440C | Good | Moderate | Excellent | YES | $$ |
| 17-4 PH | Good | Good | Excellent | YES | $$$ |
| 2205 | Superior | Good | Excellent | NO | $$$ |
CNC Machining Capabilities
State-of-the-art equipment and processes for precision stainless steel machining.
Tight Tolerances
±0.005mm
Standard tolerance for precision features. Even tighter tolerances available upon request.
Part Size
Up to 1000mm
Maximum machining envelope. Larger parts available with special setup.
Multi-Axis CNC
3, 4 & 5 Axis
Complex geometries and reduced setup times with multi-axis machining centers.
Production Volume
1 to 10,000+
From single prototypes to high-volume production runs with consistent quality.
Lead Time
3-7 Days
Standard lead time for stainless steel parts. Expedited service available.
Certifications
ISO 9001
Material test reports (MTR), certificates of conformance, full traceability.
Stainless Steel Surface Finishing
Complete finishing services to enhance appearance, corrosion resistance, and performance.
Protective Finishes
Enhance corrosion resistance and ensure biocompatibility for critical applications.
- Passivation (ASTM A967)
- Electropolishing
- Pickling & Passivation
- Nitric Acid Passivation
- Citric Acid Passivation
Protective Finishes
Enhance corrosion resistance and ensure biocompatibility for critical applications.
- Passivation (ASTM A967)
- Electropolishing
- Pickling & Passivation
- Nitric Acid Passivation
- Citric Acid Passivation
Protective Finishes
Enhance corrosion resistance and ensure biocompatibility for critical applications.
- Passivation (ASTM A967)
- Electropolishing
- Pickling & Passivation
- Nitric Acid Passivation
- Citric Acid Passivation
Industries & Applications
Stainless steel CNC machined parts for demanding industries worldwide.
Medical Devices
Surgical instruments, implants, and medical equipment requiring biocompatibility and sterilization resistance.
Aerospace
High-strength components for aircraft and spacecraft requiring lightweight and corrosion resistance.
Automotive
Engine components, exhaust systems, and decorative trim requiring heat and corrosion resistance.
Food & Beverage
Processing equipment, storage tanks, and handling systems requiring food-grade hygiene.
Marine & Offshore
Components exposed to saltwater and harsh marine environments requiring superior corrosion resistance.
Chemical Processing
Valves, pumps, and process equipment handling corrosive chemicals and high temperatures.
Frequently Asked Questions
What is the difference between 304 and 316 stainless steel?
Which stainless steel is easiest to machine?
303 is the most machinable austenitic stainless steel due to added sulfur. 416 is the most machinable martensitic grade. Both are ideal for complex parts requiring extensive machining operations.
What file formats do you accept for designs?
3D+2D drawings, preferred formats below:
- STEP (.stp)
- IGES (.igs)
- PDF drawings (with GD&T callouts)
What are your standard lead times?
It’s really depends on your project. For reference, our normal lead time for most projects is within 2-4 weeks. We highly suggest you let us know your requirements during communication, then we will check and get back to you.
Do you offer design assistance?
Yes, our engineering team provides design for manufacturability (DFM) feedback to help optimize your designs for CNC machining.
What is your minimum order quantity?
We don’t have a minimum order quantity. We can produce a single prototype or thousands of parts depending on your needs.
What is your return policy?
At Metalicnc, every product goes through strict verification—from trial production and inspection testing to customer confirmation—before shipment. Our quality assurance process ensures that all parts meet the agreed specifications before delivery, minimizing the risk of nonconformities. We take pride in our precision and reliability, and every shipment is the result of a joint confirmation between our engineers and customers.
In the rare event that a delivered part does not meet the agreed specifications, we follows a transparent and responsible after-sales process. Customers can submit a claim with inspection data, photos, or videos clearly indicating the nonconforming features. Our quality team will review the case within 48 hours to identify root causes—whether related to design, machining, material, or logistics.
Based on the assessment, we provide appropriate solutions such as rework, remake, partial refund, or credit, in line with the order terms. All cases are fully documented and backed by inspection records to ensure traceability. To help us resolve issues faster, customers should retain original samples and all supporting evidence. Each case also feeds into our continuous improvement system to further enhance product quality and customer satisfaction
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