# HUAYUN Stainless Steel (HuayunCast)

> HUAYUN Stainless Steel Manufacturing Co., Ltd. is an ISO 9001:2015 certified silica sol (lost wax) investment casting foundry in Xinyi, Jiangsu, China, founded in 2003. It casts stainless steel parts (304, 316, 316L, CF8, CF8M, 17-4PH, 2205 and 2507 duplex, Hastelloy C276) from 0.05 kg to 50 kg and finishes them in-house with CNC machining, mirror polishing, passivation and electropolishing.

Key facts (from this website):
- Process: silica sol investment casting, tolerance CT4–CT6 (ISO 8062); ±0.1 mm standard and up to ±0.01 mm on CNC-machined features.
- Surface: Ra 1.6–3.2 µm as cast; mirror polish to Ra < 0.2 µm on architectural and marine parts.
- Lead times: tooling 5–7 business days, samples 7–10 business days after drawing approval, production 3–5 weeks for standard orders.
- MOQ: 50 kg per order, no piece-count minimum. Annual capacity 2,000+ metric tons.
- Quality: OES spectrometer per heat, EN 10204 3.1 material certificates, CMM reports, PT/UT/X-ray on request, 100% pressure testing for valve and pump parts.
- Markets: architectural railing hardware, marine hardware, valves and pumps, lighting, food equipment; customers in 30+ countries.
- Contact: info@huayunstainlesssteel.com, +86 186 6785 1978 (Eric Yang, Sales Manager). Quote within 24 business hours from STEP/PDF drawings.

## FAQ and buyer questions
- [AISI 316 Stainless Steel Rollers: Casting or CNC Machining?](https://huayunstainlesssteel.com/faq/aisi-316-stainless-rollers-casting-vs-machining): Buyer FAQ for AISI 316 / CF8M stainless steel rollers ordered every year in the thousands: when to cast and when to turn from bar, 316 in pool and seawater, tolerances, finish, tooling, lead times and what the RFQ needs.
- [Mirror Polished Gold PVD Stainless Steel Castings: Buyer FAQ](https://huayunstainlesssteel.com/faq/mirror-polished-gold-pvd-stainless-castings): 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.
- [Small Heat-Treated Stainless Castings: AISI 431 vs 17-4PH](https://huayunstainlesssteel.com/faq/small-heat-treated-431-17-4ph-castings): 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.

## Company
- [China Stainless Steel Casting Factory](https://huayunstainlesssteel.com/): China stainless steel casting factory. ISO 9001 certified investment casting foundry. SS304/316L/Duplex. OEM manufacturing, CNC machining. 24-hour quote from factory direct.
- [About HuayunCast](https://huayunstainlesssteel.com/about-us): HuayunCast is a China stainless steel casting factory founded by Mr. Sang. From polishing workshop to Olympic-grade investment casting foundry. Q-railing exclusive OEM partner.
- [Stainless Steel Investment Casting Capabilities](https://huayunstainlesssteel.com/capabilities): China stainless steel investment casting capabilities: Silica Sol process, 5-axis CNC machining, mirror polishing. SS304/316L/Duplex. ISO 9001 certified. Free DFM review.
- [Our Global Customers](https://huayunstainlesssteel.com/our-customers): Trusted by global brands including Q-railing and Rio Olympics. HuayunCast manufactures critical stainless steel components for marine, railing, and industrial sectors.
- [Stainless Steel Casting for Marine, Valve & Architectural Industries](https://huayunstainlesssteel.com/industry): Precision SS castings for marine, food & beverage, lighting, valve, and automotive industries. ISO 9001 certified. Factory-direct from Xinyi, Jiangsu, China.
- [Contact Us](https://huayunstainlesssteel.com/contact-us): Send your STEP or PDF drawings for a free DFM review. Our engineers respond within 24 hours with a detailed quote. Email: info@huayunstainlesssteel.com

## Products
- [Custom Stainless Steel Parts Made to Your Drawing](https://huayunstainlesssteel.com/parts): Custom stainless steel parts cast and CNC machined to your STEP or PDF drawing: 316L, CF8M, 304, 17-4PH. Tolerances to ±0.01mm, free DFM review, 24-hour quote.
- [Stainless Steel Railing Parts OEM Manufacturer](https://huayunstainlesssteel.com/products/railing-parts): China OEM manufacturer of stainless steel railing parts. Q-railing exclusive supplier. Glass spigots, handrail brackets, balustrade components. Investment cast SS316. 24h quote.
- [Mirror Polished Stainless Steel Marine Castings](https://huayunstainlesssteel.com/products/marine-hardware): China SS316 marine hardware casting factory. Mirror polished stainless steel marine castings: cleats, deck fittings, hinges. Ra<0.2μm. ASTM B117 salt spray tested. OEM orders. 24h quote.
- [Mirror Polished Stainless Steel Marine Castings](https://huayunstainlesssteel.com/mirror-polished-marine-castings): China investment casting foundry specialising in mirror polished SS316 marine castings. Ra ≤ 0.4 μm, ASTM B117 salt spray tested, MTC 3.1 certified. 24h quote response. Factory direct.
- [Stainless Steel Valve Body Casting OEM](https://huayunstainlesssteel.com/products/valve-fluid-control): China OEM stainless steel valve body casting factory. Zero-porosity SS valve bodies, pump impellers, CF8M/Duplex 2205. 100% pressure tested. ISO 9001. 24h quote.
- [Precision Mechanical & Industrial Stainless Steel Castings](https://huayunstainlesssteel.com/products/mechanical-components): Complex non-standard stainless steel machinery parts from 50 g to 50 kg: silica sol investment casting, 4/5-axis CNC machining, CMM inspection, EN 10204 3.1 MTC.
- [Architectural Stainless Steel Hardware: Glass Clamps & Spigots](https://huayunstainlesssteel.com/products/architectural-lighting): Investment cast SS304/SS316 glass clamps, pool fence spigots and handrail brackets, hand polished to Ra < 0.2μm and shipped with 3.1 mill certificates. Custom sizes.
- [Investment Cast Stainless Steel Pipe Fittings](https://huayunstainlesssteel.com/products/fittings): Cast stainless steel elbows, tees, reducers, flanges and unions in SS304, 316L and CF8M. ASME B16.9, DIN 11850, SMS 3008 or custom sizes, with smooth Ra ≤ 1.6μm bores.
- [Stainless Steel Kitchen Parts: Cookware Handles & Knobs](https://huayunstainlesssteel.com/products/kitchen-parts): Investment cast SS304/316 cookware handles, appliance knobs, lids and trim for cookware and kitchen appliance OEMs. Mirror or brushed finish, food-safe passivation.
- [Stainless Steel Horse Parts: Bits, Stirrups & Buckles](https://huayunstainlesssteel.com/products/horse-parts): Investment cast SS 316L equestrian hardware — bits, stirrups, buckles and fittings — mirror or satin polished, 7–10 day first samples, EN 10204 3.1 MTC. OEM and custom.

## OEM and buying guides
- [OEM Stainless Steel Casting Manufacturer China](https://huayunstainlesssteel.com/custom-oem): China OEM stainless steel casting manufacturer. Custom investment casting, CNC machining, OEM supply from prototype to mass production. Free DFM review in 24h. Factory direct.
- [OEM Investment Casting Foundry China: How to Choose a Stainless Steel Partner](https://huayunstainlesssteel.com/oem-stainless-steel-casting-guide): Guide for OEM buyers choosing a China investment casting foundry for stainless steel parts. Material grades, DFM, quality verification, tooling costs. Factory direct from HuayunCast.

## Blog and case studies
- [Blog](https://huayunstainlesssteel.com/blog): Expert articles on investment casting, CNC machining, DFM tips, and supply chain strategy for engineers and procurement managers sourcing stainless steel parts.
- [5 DFM Tips to Cut Lead Time on Cast SS Parts](https://huayunstainlesssteel.com/blog/5-dfm-tips-cut-lead-time-investment-casting): 5 expert Design-for-Manufacturing tips that reduce lead time on investment cast stainless steel parts. From Huayun's engineering team — avoid the most common CAD mistakes.
- [Aluminum to 316L: Beverage Filling Machine Valve Bodies](https://huayunstainlesssteel.com/blog/aluminum-die-cast-to-316l-beverage-filling-valve-body): Aluminum die-cast valve bodies on beverage filling machines corrode and pit under CIP cleaning chemicals. 316L stainless steel investment casting is the industry-standard upgrade.
- [Aluminum Die-Cast to 316L: Coastal CCTV Camera Housing](https://huayunstainlesssteel.com/blog/aluminum-to-316l-coastal-surveillance-camera-housing): A UK client's coastal surveillance camera housings were failing due to seawater corrosion of aluminum die-cast shells. Switching to 316L stainless steel investment casting protected the lens and PCB — permanently.
- [Aluminum to 316L SS: High-Performance Exhaust Brackets](https://huayunstainlesssteel.com/blog/aluminum-to-316l-high-performance-exhaust-bracket): Aluminum exhaust brackets crack at high temps and corrode with road salt. 316L stainless steel investment casting handles 800°C+ — the motorsport upgrade choice.
- [Aluminum to 316L SS: Outdoor LED Fixture Housing for Coastal Use](https://huayunstainlesssteel.com/blog/aluminum-to-316l-outdoor-led-fixture-housing-coastal): Aluminum die-cast LED fixture housings fail within 2-3 years in coastal environments. 316L stainless steel investment casting delivers 15+ year service life with zero maintenance.
- [Bronze to 316L SS: Seawater Cooling System Pump Bodies](https://huayunstainlesssteel.com/blog/bronze-to-316l-seawater-cooling-pump-body): Bronze pump bodies in seawater cooling systems suffer dezincification and failure. 316L stainless steel investment casting eliminates galvanic corrosion and extends pump life 3x.
- [Cast Iron to 316L SS: Chemical Pipeline Valve Bodies](https://huayunstainlesssteel.com/blog/cast-iron-to-316l-chemical-pipeline-valve-body): Cast iron valve bodies corrode rapidly in acid and chloride chemical pipelines. 316L stainless steel investment casting eliminates leaks, downtime, and replacement costs in chemical plants.
- [Case Study: How We Saved 2 Days on a Bubble Cap Order](https://huayunstainlesssteel.com/blog/how-we-saved-2-days-bubble-cap-order): Real case study: 2,500 sets of 310 SS Bubble Caps, a tight deadline, and one engineering decision that saved two full production days. With engineering drawing details.
- [Investment Casting vs CNC for Stainless Steel Parts](https://huayunstainlesssteel.com/blog/investment-casting-vs-cnc-machining): Compare investment casting vs CNC machining for stainless steel. Expert guide from Huayun Stainless Steel — a one-stop manufacturer with both processes in-house.
- [Tight Deadline on SS Casting? One-Stop Supplier Solves It](https://huayunstainlesssteel.com/blog/tight-deadline-one-stop-supplier): Fragmented supply chains kill delivery deadlines on stainless steel casting orders. Learn how a one-stop casting + CNC supplier eliminates delays and blame games.
- [Why Food Equipment Makers Switch from Zinc to 316L SS](https://huayunstainlesssteel.com/blog/zinc-die-cast-to-316l-food-processing-equipment-clips): Zinc die-cast clips and fasteners on food processing lines corrode, contaminate product, and fail FDA audits. Learn why 316L stainless steel investment casting is the permanent fix.
- [Zinc to 316L SS: Glass Curtain Wall Clamps That Last Decades](https://huayunstainlesssteel.com/blog/zinc-to-316l-glass-curtain-wall-clamps-architectural): Zinc die-cast glass clamps and spigots fail in 5-7 years on coastal buildings. 316L stainless steel investment casting delivers 25+ year maintenance-free performance for architects.
- [Zinc to 316L SS: Industrial Robot Arm Joint Housings](https://huayunstainlesssteel.com/blog/zinc-to-316l-industrial-robot-arm-joint-housing): Zinc die-cast robot arm joint housings wear and corrode in harsh factory environments. 316L stainless steel investment casting delivers 5x longer service life in chemical, food, and wet process plants.
- [Zinc Die-Cast to 316L SS: US Navy Vessel Door Hardware](https://huayunstainlesssteel.com/blog/zinc-to-316l-marine-door-hardware-navy-vessel): A US Navy vessel in Florida replaced corroding zinc die-cast door handles with 316L stainless steel investment castings, eliminating plating failure and ongoing replacement costs.