Frequently asked questions

Pricing depends on material, part size, quantity and certification needs. Send us a photo and details — we'll quote within 24 hours. The spec builder walks you through the details we need before you send anything.

Cr3+ (Trivalent Chromium) zinc plating uses chromium-3 ions, which are non-carcinogenic and meet RoHS/REACH directives. It replaces the older, hazardous Cr6+ (Hexavalent). We migrated entirely to Cr3+ in 2020.

Hours depend on the passivation, the zinc thickness and which endpoint you measure. In an ASTM B117 chamber our Cr3+ zinc on small parts typically reaches, to white rust: clear/blue 72–120 h · yellow/iridescent 120–200 h · black 72–96 h. Thickness is what buys hours — ASTM B633 sets the service-condition classes SC1 5 µm · SC2 8 µm · SC3 13 µm · SC4 25 µm. A common automotive benchmark for clear trivalent zinc is 72 h to white rust and 168 h to red rust. These are accelerated test results, not outdoor service life. Tell us the standard and the endpoint your drawing requires and we will build the process to it.

Carbon and boron steels (S20C, S45C, SWCH10B21, SWCH10B33) · alloy steels (SCM435, SCM440, SCr440) · spring steel (SUP9) · bearing steel (SUJ2) · tool steels (SK85, SKS3) · stainless (SUS304, SUS420J2). Our line is a continuous mesh-belt furnace running 750–950 °C, so grades that austenitize above that range are outside it. We take small parts in bulk — screws, nuts, bolts, pins, springs, washers — priced by weight rather than per piece. Send the drawing and the grade and we will confirm before you ship.

Yes — Hardness Test Report (HV/HRC), Coating Thickness Report (X-ray), Salt Spray Test Report (ASTM B117), Material Test Certificate. Issued with the order or separately.

Flexible — from a few prototype pieces to mass production of tens of thousands per month.

It depends on the job type and volume. High-volume orders can be scheduled in advance — contact our sales team to confirm a delivery schedule.

Yes — we export across ASEAN, China, and Europe. Cr3+ plating and heat treatment shipments handled regularly with full RoHS/REACH export documentation.