Polished Stainless Steel 304 316 Investment Casting Faucet

Process Technology

Precision Casting Foundation
Stainless steel precision castings, also known as investment castings, are manufactured using the lost-wax casting process. This method ensures high dimensional accuracy, with tolerances as tight as ±0.1 mm, and minimal surface defects.
Such quality provides an excellent foundation for the subsequent mirror polishing process, significantly reducing the amount of material that needs to be removed in the finishing stages.
Multi-Stage Polishing Sequence
● Mechanical Grinding: The process begins with coarse grinding to eliminate casting marks, weld seams, and other irregularities. Abrasive belts or wheels (ranging from 80 to 400 grit) are typically used at this stage.
● Fine Polishing: Next, intermediate polishing is carried out using diamond or ceramic abrasive pastes (e.g., 800–3000 grit). This refines the surface to a uniform semi-gloss and removes any scratches from previous grinding.
● Mirror Finishing: The final stage involves ultra-fine abrasives (such as 5000–8000 grit) or chemical-mechanical polishing (CMP) to achieve a flawless mirror finish. For critical applications- such as aerospace casting parts or medical-grade stainless steel products - electropolishing is often added to improve surface uniformity and corrosion resistance.

Basic Information

Key Features

Precision Casting Technology:

Enables the production of stainless steel investment casting parts with complex geometries (e.g., thin walls, internal cavities, fine details) that are difficult to achieve with traditional machining. Net-shape or near-net-shape production reduces material waste and post-processing costs.

Material Excellence:

Manufactured from high-grade 304/316L stainless steel, these stainless steel precision casting components provide exceptional corrosion resistance, strength, and durability.

Superior Surface Finish:

Features a mirror polishing process that achieves refined finishes (Ra ≤ 0.8 μm) or brushed/satin textures. Enhances aesthetics, reduces friction, improves cleanability, and prevents bacterial growth—making it ideal for medical-grade stainless steel and other hygienic applications.

Dimensional Accuracy:

Maintains tight tolerances (as precise as ±0.05 mm), ensuring that each investment casting polished component integrates seamlessly into assemblies and meets demanding performance requirements.

Electropolishing Enhancement

Electropolishing is an electrochemical process that dissolves microscopic peaks on the metal surface. It can reduce surface roughness by more than 50%, while also enhancing brightness and cleanability. This step is especially important for medical-grade stainless steel and food-safe investment casting polished components, where superior hygiene and smoothness are essential.

Technical Specifications

Applications

• Aerospace: Mirror-polished turbine blades, engine casings, and satellite optical components to enhance performance and reflectivity.
• Medical: Surgical instruments, endoscopic parts, and dental implants that require superior biocompatibility and effortless sterilization.
• Automotive: Exhaust tips, trim accents, and headlight reflectors tailored for premium vehicle brands, combining aesthetics with functionality.
• Architecture: Cladding panels, handrails, and sculptures designed for high-end commercial and residential projects, offering durability and visual appeal.

Key Advantages

• Aesthetic Excellence: The mirror polishing process delivers a luxurious, high-end appearance, significantly elevating product value.
• Corrosion Resistance: By eliminating microscopic surface imperfections, the polished surface minimizes areas where moisture and corrosive agents could accumulate.
• Hygienic Properties: The ultra-smooth, non-porous finish prevents bacteria and contaminants from adhering to the surface.
• Functional Benefits: The flawless surface achieved through polishing ensures accurate and consistent light reflection.

Selection Guide

Select the appropriate medical-grade stainless steel or marine-grade alloy according to corrosion resistance needs and operating conditions.

• 304/304L Stainless Steel:Suitable for indoor applications with moderate corrosion resistance requirements. Typical uses include architectural cladding and decorative fixtures.
• 316/316L Stainless Steel:Ideal for coastal or chemical environments. Its molybdenum content enhances resistance to pitting and crevice corrosion.
• Duplex Stainless Steel (e.g., 2205):Combines high strength and excellent corrosion resistance, making it suitable for structural parts in offshore and industrial settings.

Choose from different finishing techniques based on functional and aesthetic requirements. The mirror polishing process is recommended for applications requiring low friction and easy cleaning.

Ensure components meet industry standards such as ASTM, ISO, or FDA, particularly for use in medical, aerospace, and food industries.

Quality Control

Profilometers are used to ensure surface roughness meets specified requirements, such as Ra ≤ 0.05 μm for a high-quality mirror finish.

Components are examined under controlled lighting to identify surface defects, including orange peel, holograms, and scratches.

Durability is validated through standardized tests such as salt spray testing (ASTM B117) and electrochemical impedance spectroscopy (EIS).

Mirror polishing of stainless steel precision castings exemplifies the highest standard of metal surface finishing. By integrating advanced manufacturing methods with stringent quality control, the process produces components that excel both functionally and aesthetically.

As industry requirements increasingly emphasize superior performance and refined visual appeal, mirror polishing will continue to play an essential role in high-value applications.

Packaging & Shipping

Products are carefully protected with spark-proof film or kraft paper, then boxed or palletized. Reinforced corners and custom packaging help withstand long-distance sea or truck transport, ensuring safe arrival at customer destinations.

Packaging Details	Carton/Palette/Customized
Individual Packaging Size	Example: 8X10X15 cm (subject to change)
Single Item Gross Weight	Example: 0.50 KG (subject to change)
Delivery Time	7-30 days after payment
Shipping Method	Sea/Air/Courier

Custom Services

Customization Options	Minimum Order Quantity
Custom Logo	100 pieces
Custom Packaging	100 pieces
Graphic Customization	100 pieces
Product Customization	100 pieces

Why Choose Jarzoo?

Hebei Jarzoo Metal Products Co., Ltd. is a specialized factory focused on producing castings. Since the 1990s, we have been part of the precision casting industry in Cangzhou, known for its rich casting heritage and strategic location near major cities like Beijing and Tianjin, ensuring efficient logistics.

1. Comprehensive Production Line – From mold design to casting, machining, and surface treatment.
2. Advanced Equipment & Skilled Team – Ensuring precision manufacturing and reliable quality.
3. Expert Design Support – Providing professional advice to meet diverse customer needs.
4. Order Tracking & Feedback System – Prioritizing customer input for continuous improvement.
5. Dedicated Sales & After-Sales Service – Building long-term trust and strong client relationships.
6. Open Collaboration – Welcoming customer visits and exploring mutually beneficial partnerships.

If you have any questions,please feel free to contact us. There are professional service staff to serve you.

FAQs

Q1: What is your delivery time?

Typically, samples are delivered within 25 working days, and bulk production takes 60 working days.

Q2: What are your payment terms?

For payments up to $1,000, full payment is required in advance. For payments of $1,000 or more, a 30% T/T payment is required in advance, with the balance due before shipment.

Q3: What products do you need from customers?

We can customize products based on your drawings and samples.

Q4: Do you have traceability capability?

Yes, tested samples will be stored in our laboratory for at least two years.