Custom Structural Casting Investment Casting

Product Overview

Custom Structural Casting is a precision investment casting component manufactured by Wuxi Huayong Metal Technology Co., Ltd. Our investment casting process ensures exceptional dimensional accuracy, superior surface finish, and excellent mechanical properties. Unlike sand casting, investment casting produces near-net-shape components with minimal machining requirements, reducing overall cost and lead time.

All our custom structural casting castings are custom manufactured based on customer drawings or samples. We work closely with our clients' engineering teams to optimize designs for castability, ensuring high-quality, defect-free castings at competitive prices. Every component undergoes rigorous quality control including chemical analysis, mechanical testing, and non-destructive testing.

Material Options

We offer a wide range of materials for custom structural casting castings, including stainless steel, carbon steel, alloy steel, copper alloys, and heat-resistant alloys. All materials are sourced from certified suppliers and verified with spectrometer analysis.

Material Family	Common Grades	Key Properties	Typical Applications
Stainless Steel	CF8M, CF8, CF3M, CF3, 316L, 304L	Excellent corrosion resistance, good mechanical properties	Chemical, food, marine, water treatment
Carbon Steel	WCB, WCC, LCC, LC2	Good strength, weldability, cost-effective	Oil & gas, power, general industrial
Alloy Steel	WC6, WC9, C5, C12A, 42CrMo	High temperature strength, wear resistance	Power generation, high-temp service, automotive
Duplex Steel	CD4MCu, CD3MN, 2205	High strength, excellent pitting resistance	Oil & gas, desalination, chemical
Copper Alloy	C95400, C93200, C83600, Tin Bronze	Excellent wear resistance, corrosion resistance	Bearings, gears, marine, decorative
Heat Resistant	HK30, HU31, 310S, 309S	High temperature oxidation resistance	Furnace parts, heat treatment, power

Manufacturing Process

1. Pattern Making

We produce high-precision wax patterns using injection molding. The wax patterns are exact replicas of the final custom structural casting, including all internal passages and external features.

2. Shell Building

The pattern tree is repeatedly dipped into ceramic slurry and coated with refractory sand. This process is repeated 6-8 times to build a strong, heat-resistant ceramic shell.

3. Dewaxing & Preheating

The ceramic shell is placed in an autoclave where steam melts the wax, which drains out. The empty shell is then preheated to 1000-1100°C to remove residual moisture.

4. Melting & Pouring

Metal is melted in induction furnaces under carefully controlled conditions. The molten metal is poured into the preheated ceramic shells.

5. Shell Removal & Cutting

After solidification and cooling, the ceramic shell is removed by mechanical vibration and blasting. The individual components are then cut from the sprue.

6. Heat Treatment

All castings undergo proper heat treatment to achieve optimal mechanical properties and material structure.

7. CNC Machining

The cast custom structural casting are precision machined on CNC lathes and machining centers. We maintain tight tolerances on critical dimensions.

8. Surface Treatment & Testing

Finished components undergo surface treatment and comprehensive quality testing including dimensional inspection, chemical analysis, and non-destructive testing.

Quality Control & Testing

We maintain rigorous quality control at every stage of production to ensure that every Custom Structural Casting meets or exceeds customer specifications:

• Chemical Analysis: Spectrometer analysis of every heat, with full material test certificates (EN 10204 3.1)
• Mechanical Testing: Tensile strength, yield strength, elongation, and hardness testing per ASTM A370
• Dimensional Inspection: CMM (Coordinate Measuring Machine) inspection of critical dimensions
• Non-Destructive Testing (NDT): Radiographic testing (X-ray), liquid penetrant testing, ultrasonic testing as required
• Microstructure Examination: Metallographic analysis to verify grain structure and detect defects
• Pressure Testing: Hydrostatic pressure testing for pressure-containing components

Applications

Our custom structural casting castings are used in a wide range of industries and applications:

• Oil & Gas: Upstream, midstream, and downstream processing, refineries, pipelines
• Chemical Processing: Acid handling, chemical reactors, transfer lines
• Power Generation: Thermal power, nuclear power, renewable energy
• Water Treatment: Desalination, wastewater treatment, water distribution
• Food & Beverage: Processing, filling, CIP systems, sanitary applications
• Pharmaceutical: Drug manufacturing, sterile processing, biotech
• Marine: Shipbuilding, offshore platforms, desalination
• Automotive: Engine components, transmission parts, exhaust systems
• Aerospace: Aircraft components, turbine parts, structural components
• Pulp & Paper: Bleaching, chemical recovery, stock preparation

Why Choose Huayong for Your Custom Structural Casting Castings?

• Complete In-House Capability: From wax pattern to final CNC machining — all under one roof for better quality control
• Material Expertise: Experienced in stainless steel, carbon steel, alloy steel, copper alloys, and specialty alloys
• ISO 9001 Certified: Rigorous quality management system with full traceability
• Custom Manufacturing: All parts made to your exact drawings and specifications
• Competitive Pricing: Factory-direct pricing with no middleman markup
• Fast Response: Quotations within 48 hours, technical support 24/7
• Global Export Experience: Serving clients in Europe, North America, Middle East, and Southeast Asia
• Flexible MOQ: From prototype quantities to mass production

Engineering Design Tips for Precision Castings

1. Wall Thickness Design

Maintain uniform wall thickness throughout the casting to minimize shrinkage porosity and thermal stress during solidification. Avoid abrupt section changes; use gradual transitions with fillet radii of at least 2-3mm. Minimum wall thickness for investment casting is typically 2mm for small parts and 3mm for larger components.

2. Draft Angles

Design with minimum 1° draft angle for external surfaces and 1.5° for internal surfaces to facilitate wax pattern removal from the die and ceramic shell breakdown. Deeper features may require additional draft.

3. Fillet Radii

Always use generous fillet radii at internal corners (minimum R2-3mm) to reduce stress concentration and improve castability. Sharp corners are prone to cracking and porosity during solidification.

4. Machining Allowance

Allow 2-3mm machining allowance per surface for CNC operations. Critical sealing surfaces and precision bores may require additional allowance. As-cast tolerances of ±0.1mm per 25mm are achievable with investment casting.

5. Surface Finish Considerations

Investment casting provides Ra 1.6-3.2μm as-cast surface finish. For applications requiring smoother surfaces, specify polishing, electropolishing, or machining in the drawing requirements.

Frequently Asked Questions

Q: What materials can you cast?

A: We work with stainless steel (304, 316, CF8, CF8M), carbon steel (WCB), alloy steel, duplex steel (2205), heat-resistant alloys, copper alloys, and specialty alloys. Custom compositions available per specification.

Q: What is the typical lead time?

A: Standard lead time is 30-45 days for production orders and 15-20 days for prototype/sample quantities. Rush service may be available depending on current production load.

Q: Can you provide material test certificates?

A: Yes, every heat comes with EN 10204 3.1 material test certificates including chemical composition and mechanical properties. Third-party inspection (Lloyd's, BV, SGS) available upon request.

Q: What is the minimum order quantity?

A: Our standard MOQ is 100 pieces, but we can accommodate smaller prototype orders with negotiable pricing. Tooling cost is amortized over production volume.

Q: Do you offer CNC machining services?

A: Yes, we provide complete in-house CNC machining including turning, milling, drilling, tapping, and grinding. We can deliver fully finished, ready-to-assemble components.