What makes steel “stainless” Steel becomes stainless when it contains at least 10.5% chromium. The chromium reacts with oxygen to form a passive layer on the surface only a few nanometres thick. If that layer is scratched, it re-forms on its own in the presence of air. That self-healing layer is why stainless resists rust…
High pressure die casting (HPDC) forces molten metal into a hardened steel die at pressures from 1,500 to 25,000 psi and holds it there until it solidifies. The process is fast, repeatable, and produces thin walls and tight tolerances that sand and investment casting cannot touch. But it only works with a narrow family of…