Precision 316 Stainless Steel Medical Fluid Component with Passivation for Bio-Contact Applications

We manufactured a precision 316 stainless steel medical fluid component for a diagnostic equipment fluid handling application. 316 stainless steel is preferred in medical fluid contact applications for its corrosion resistance, biocompatibility, and ability to withstand sterilization — but it presents a specific challenge: machining-induced surface contamination and potential corrosion initiation sites. For this component, we implemented controlled milling parameters with sharp carbide tooling to minimize work hardening and surface defects, followed by ASTM A967-compliant passivation — a critical finishing step that removes free iron and surface contaminants, enhancing the natural oxide layer for corrosion resistance in medical fluid environments. The part was then thoroughly cleaned and packaged to maintain surface integrity through final assembly.

Project Overview

Key Technical Highlights

• Controlled 316 Machining: 316 stainless steel's work-hardening tendency requires sharp tooling and consistent feed rates to prevent surface defects and maintain dimensional accuracy.
• Passivation Process: ASTM A967 passivation removes free iron, swarf, and surface contaminants — essential for corrosion resistance and biocompatibility in medical fluid contact. The process creates a uniform oxide layer without altering critical dimensions.
• Surface Integrity: Fluid contact surfaces held to Ra≤1.6μm to minimize biofilm formation and facilitate cleaning — verified post-passivation.

Quality Verification

CMM inspection verified dimensional accuracy (±0.02mm). Surface roughness confirmed at Ra≤1.6μm. Passivation effectiveness verified per ASTM A967 specifications. Component cleaned and packaged for medical assembly.

Industry Applications

Ideal for medical diagnostic fluid pathways, laboratory equipment components, pharmaceutical processing parts, and sterile fluid handling systems.

Why Partner With Us?

• Proven expertise in 316 stainless steel machining with medical-grade finish control
• In-house ASTM A967 passivation capabilities
• Controlled machining and handling for biocompatibility compliance
• 12+ years serving medical device and diagnostic equipment sectors