I work with 316L stainless steel regularly on CNC milling projects for the UK market, and it’s worth starting with what makes this grade special and why finishing it to a mirror polish is not straightforward.
Here’s one of the projects. A UK-based medical device manufacturer required a 316L stainless steel material for its critical surgical instrument components, along with a mirror-polished finish achieving a Ra value of ≤0.1 μm. This type of surface treatment is crucial for reducing bacterial adhesion, enhancing corrosion resistance, and meeting the ISO 13485 standard for the UK medical industry. The core challenge of this project was to overcome the high hardness and work-hardening characteristics of 316L stainless steel while preventing dimensional deviations caused by thermal deformation.
In this article, I’ll walk you through a real-world case from our company where we manufactured aluminum alloy cold plates for a client with stringent thermal management requirements. I’ll break down every key step in detail—from optimizing channel designs and executing ultra-precise CNC milling, to the critical vacuum brazing for sealing, and rigorous leak testing. This will demonstrate how we create high-performance heat dissipation components that not only efficiently remove heat and optimize system performance but also deliver absolute reliability to meet the client’s needs.
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