FAQ

Straight answers to the questions buyers ask us about stainless steel investment casting, polishing, finishes, materials, tooling, lead time and cost drivers.

• Mirror Polished Gold PVD Stainless Steel Castings: Buyer FAQ

  Can complex stainless steel investment castings be mirror polished and gold PVD coated? Answers on splitting designs, welded vs threaded joints, food contact, dishwasher use, 304 vs 316 and cost drivers.

  Updated 2026-10-07
• Small Heat-Treated Stainless Castings: AISI 431 vs 17-4PH

  Buyer FAQ for small, high-strength investment cast stainless parts: AISI 431 vs 17-4PH, hardening to a set HRC, why trial parts must use the production alloy, JS13 tolerances, customer-owned wax moulds and finishing.

  Updated 2026-10-07

More articles: HUAYUN blog (case studies on replacing zinc, aluminum, bronze and cast iron parts with 316L stainless steel castings).