Marine & Offshore Hardware
Mirror Polished Stainless Steel
Marine Castings — SS316 Factory Direct
China-based SS316/316L marine hardware casting foundry. Investment casting with hand-mirror polishing (Ra < 0.2μm) for yacht hardware, offshore fittings, and OEM marine components. Factory direct — no middlemen.
Why Specify Huayun for Marine Projects
Technical Superiority
Marine Grade Alloys
Specializing in 316, 316L, and Duplex SS for extreme saltwater durability. High molybdenum content (2–3%) provides superior resistance to pitting and crevice corrosion in chloride-rich environments.
Surface Excellence
Manual mirror polishing and electropolishing to prevent pitting and tea staining. Our in-house polishing line achieves Ra < 0.2μm — smooth surfaces resist marine biofouling and crevice corrosion.
Rigorous Testing
100% material analysis via OES spectrometer. 72h/96h Salt Spray Testing (ASTM B117) available. Passivation per ASTM A967 as standard. Full documentation: passivation cert, MTC, and test reports.
Product Gallery
Marine Hardware We Produce
Boat cleats, deck plates, mooring hardware, and custom marine castings — all produced via Silica Sol investment casting with in-house CNC finishing and mirror polishing.
Hinges & CleatsMarine Hinges & Cleats Collection
Heavy-duty investment cast hinges. Salt spray tested per ASTM B117.
Deck HardwareDeck Hardware: Through-Hulls & Fillers
Through-hulls, deck fillers, flush pull handles. ASTM A967 passivation.
Full RangeFull Marine Hardware Range
Cleats, hooks, hinges, brackets — all investment cast, all mirror polished.
Boat CleatsBoat Cleats — Multiple Sizes
Investment cast. High load-bearing. Proof load testing available.
Deck PlateMarine Deck Plate
Investment cast. Flush-mount design. ASTM A967 passivation standard.
Marine HingeHeavy-Duty Marine Hinge
Heavy-duty knuckle hinge. 96h salt spray tested per ASTM B117.
Surface Excellence
Hand Mirror Polishing to Ra < 0.2μm
Every marine hinge, cleat, and deck fitting leaves our facility with a surface finish that actively resists tea staining, pitting, and biofouling — proven in saltwater environments.
- Grit 240 → 320 → Mirror polish sequence
- Electropolishing for hygienic & anti-fouling surfaces
- Passivation per ASTM A967 as standard
- 96h salt spray test certificate available
Our Commitment to Quality
Marine Quality Standards
Material Integrity
- 100% SS316 & SS316L — Molybdenum-enhanced for chloride resistance
- Every heat verified by OES spectrometer analysis
- EN 10204 3.1 Mill Test Certificate with every shipment
Surface Precision
- Hand-mirror polishing to Ra < 0.2μm
- Maximum tea-staining and pitting resistance
- Electropolishing available for subsea / splash-zone parts
Compliance
- 96-hour Salt Spray Testing per ASTM B117 (available)
- Material Test Certificates (MTC 3.1) — standard
- Passivation per ASTM A967 | NDT (PT, UT, X-Ray) on request
Technical Data
Marine Hardware Specifications
| Primary Material | AISI 316 / 316L (EN 1.4401 / 1.4404) |
| Premium Grade | Duplex 2205 (EN 1.4462) for subsea / high-chloride |
| Casting Process | Silica Sol Investment Casting |
| Surface Finish | Mirror polish Ra < 0.2μm | Satin Ra 0.8μm | Electropolished |
| Corrosion Testing | Salt Spray ASTM B117 — 72h / 96h (on request) |
| Passivation | Citric acid or nitric acid per ASTM A967 |
| Material Cert | EN 10204 3.1 MTC — standard with every shipment |
| NDT | PT, UT, X-Ray on request |
| MOQ | 50 pcs (prototype: 5 pcs) |
| Lead Time | Tooling: 15–20 days | Production: 25–35 days |