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STAINLESS STEELS • CORROSION & SANITARY

Stainless Steel SUS304 & 316L CNC Machining

Austenitic Alloys with Superior Acid Resistance, Medical Biocompatibility, and High Toughness.

SUS304 and SUS316L are the industry benchmark austenitic stainless steels. SUS304 provides versatile corrosion resistance and mechanical strength, while 316L adds 2-3% molybdenum and maintains ultra-low carbon (<0.03%), making it virtually impervious to pitting in chlorides, saltwater, and harsh chemical sanitizers. We machine shafts, pump bodies, and surgical tools with rigid setups and pressurized through-spindle coolant.

Zero Sensitization Carbides
Pitting Resistance PREN > 24
ISO 13485 & FDA Compliant

Material Engineering for Stainless Steel SUS304 & 316L CNC Machining

Certified raw material sourcing, certified heat-treatment verification, and extreme tolerance manufacturing calibrated specifically for Stainless Steel SUS304 & 316L CNC Machining components.

Chloride & Acid Defense

316L molybdenum content prevents localized crevice corrosion and pitting in marine and medical environments.

Anti-Work Hardening Feeds

Controlled chip loads with sharp PVD TiAlN coated carbide endmills prevent work-hardening during milling.

Electropolishing to Ra 0.2µm

Achieves mirror sanitary surface finishes, eliminating micro-burrs and microbial adhesion points.

ASTM A967 Passivation

Citric or nitric acid chemical passivation strips free surface iron, yielding an ultra-durable chromium oxide layer.

Technical Deep Dives & Processing Notes

Detailed manufacturing insights covering tooling kinematics, thermal management, surface finishing, and dimensional inspection for Stainless Steel SUS304 & 316L CNC Machining.

Precision Swiss Turning of SUS316L Medical Cannulas & Fittings 500 × 500 HD

Precision Swiss Turning of SUS316L Medical Cannulas & Fittings

Multi-axis Swiss lathes produce miniature 316L fluid connectors and bone screws with concentricity under 0.003mm, cross-hole deburring, and high-pressure oil-based cooling.

  • Machined with calibrated multi-axis kinematics minimizing tool deflection
  • GD&T true position inspected within ±0.005mm using automated CMM
  • Full material mill certs, heat treat data, and FAI documentation provided
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Rigid CNC Milling of Heavy 304 Stainless Pump Impellers 500 × 500 HD

Rigid CNC Milling of Heavy 304 Stainless Pump Impellers

Custom carbide roughing tools hog deep spiral vanes in solid 304 forged billets while constant high-pressure through-spindle coolant maintains tool cutting edge integrity.

  • Machined with calibrated multi-axis kinematics minimizing tool deflection
  • GD&T true position inspected within ±0.005mm using automated CMM
  • Full material mill certs, heat treat data, and FAI documentation provided
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Electropolishing & ASTM A967 Citric Acid Passivation 500 × 500 HD

Electropolishing & ASTM A967 Citric Acid Passivation

Components undergo ultrasonic degreasing followed by ASTM A967 chemical passivation, removing free iron particles and ensuring 500+ hours zero rust under salt fog tests.

  • Machined with calibrated multi-axis kinematics minimizing tool deflection
  • GD&T true position inspected within ±0.005mm using automated CMM
  • Full material mill certs, heat treat data, and FAI documentation provided
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Zeiss 3D Metrology & Positive Material Identification (PMI) 500 × 500 HD

Zeiss 3D Metrology & Positive Material Identification (PMI)

X-ray fluorescence (XRF) hand-held analyzers verify chemical nickel and molybdenum percentages on raw bars, followed by automated CMM inspection of critical GD&T features.

  • Machined with calibrated multi-axis kinematics minimizing tool deflection
  • GD&T true position inspected within ±0.005mm using automated CMM
  • Full material mill certs, heat treat data, and FAI documentation provided
Request Quotation for Similar Geometry

Capabilities & Quality Protocols

Every part manufactured from Stainless Steel SUS304 & 316L CNC Machining adheres to international metallurgy standards and rigorous metrology protocols.

Material Specifications & Properties

  • SUS304: 18% Cr, 8% Ni | Tensile: 520 MPa | Yield: 205 MPa | Hardness: 180 HB
  • SUS316L: 16-18% Cr, 10-14% Ni, 2-3% Mo | Tensile: 485 MPa | Yield: 170 MPa
  • Passivation standards: ASTM A967, ASTM A380, AMS 2700
  • Finishes: Ra 0.4µm machined, Ra 0.2µm electropolished, bead blasted, electropolished

Metrology & Quality Assurance

  • Zeiss PRISMO 3D CMM Metrology with scanning resolution down to 0.9µm
  • Keyence Optical Non-Contact Flash Measuring System for micro-features
  • XRF Spectrometry for raw metal alloy composition verification
  • AS9102 Form 1, Form 2, and Form 3 First Article Inspection (FAI) packages

Ready to Prototype or Scale Stainless Steel SUS304 & 316L CNC Machining?

Upload your 3D CAD models (.STEP, .IGES, .SLDPRT, .X_T) or 2D technical drawings (.PDF, .DWG) to receive an interactive quote with comprehensive Design for Manufacturability (DFM) feedback in under 2 hours.

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Frequently Asked Questions

Common engineering questions regarding tolerances, material traceability, and turnaround for Stainless Steel SUS304 & 316L CNC Machining.

What is the main advantage of 316L over 304? +
316L contains 2–3% molybdenum, which dramatically increases its resistance to chloride pitting, coastal sea spray, sulfuric acid, and bleach sanitizers compared to 304.
Why is stainless steel harder to machine than aluminum? +
Austenitic stainless steels work-harden rapidly if the cutting tool rubs rather than shears. We use high-torque spindles, rigid carbide tooling, and continuous coolant flow.
Are 304 and 316L magnetic? +
In their annealed state, both alloys are essentially non-magnetic (austenitic). However, severe cold working or heavy CNC machining can induce slight localized magnetism.
Can you supply full raw material mill certificates with melt chemistry? +
Yes. Every batch of 304 and 316L comes with EN 10204 3.1 Mill Test Certificates indicating chemical composition and mechanical test results.
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