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Investment Casting & Machining Capabilities

From tooling and lost wax casting to CNC machining, heat treatment, surface finishing and final inspection, Zeren supports custom metal components from drawing to finished part.
 
1. Custom investment casting for steel components
2. Machining, heat treatment and finishing support
3. Engineering review for drawings, samples and 3D models
 
 
Custom steel investment casting and CNC machining capabilities with cast and finished parts
Investment Casting

Investment Casting Tooling & 3D Printing CNC Machining Heat Treatment Surface Finishing Quality Control FAQ

One-Stop Manufacturing Capabilities for Custom Metal Parts

 
Zeren provides integrated manufacturing support for custom investment cast parts, including engineering review, tooling preparation, lost wax casting, CNC machining, heat treatment, surface finishing and quality inspection. This helps customers reduce supplier coordination, improve production consistency and move projects from prototype to batch production more efficiently.
 
Steel investment castings and wax tree showing custom casting capability

Investment Casting

Custom lost wax casting for stainless steel, carbon steel, alloy steel, duplex steel, heat-resistant steel and wear-resistant steel components with complex shapes and stable production requirements.
Casting tooling, wax patterns and 3D printed prototype parts for custom casting development

Tooling & 3D Printing

Tooling design, mold production and rapid casting support for new product development, sample validation and low-volume custom casting projects.
 
CNC machined investment cast parts with precision holes and mounting surfaces

CNC Machining

Post-casting machining for threaded holes, sealing faces, mounting surfaces, precision bores, grooves and other functional assembly features.
 
Heat treated steel castings with furnace and hardness inspection equipment

Heat Treatment

Quenching, tempering, annealing, normalizing, carburizing, nitriding and other heat treatment options to improve strength, hardness, toughness or wear resistance.
 
Cast metal parts with blasted, polished, blackened and plated surface finishes

Surface Finishing

Blasting, polishing, passivation, electroplating, blackening, powder coating and other finishing options for appearance, corrosion resistance and functional performance.
Quality inspection of cast and machined parts using precision measuring equipment

Quality Inspection

Dimensional inspection, material verification and production quality control to support stable casting, machining and finishing results before delivery.
 

From Drawing to Finished Part

 
Every custom casting project starts with a clear understanding of the drawing, material, application and final part requirements. Our team reviews manufacturability, prepares suitable tooling or prototype options, controls the casting process and supports secondary operations until the part is ready for assembly or shipment.
Manufacturing workflow from technical drawing to tooling, casting, machining, finishing and inspection

01 Drawing Review

We review 2D drawings, 3D models, samples, material requirements, tolerances, machining areas and surface finishing needs before quoting.

02 Tooling & Pattern Preparation

Based on the project stage and quantity, we support production tooling, sample tooling or rapid casting options for prototype validation.
 

03 Investment Casting

Wax patterns, shell building, dewaxing, pouring and cleaning are controlled to produce complex metal parts with stable shape and repeatability.

04 Secondary Processing

Heat treatment and CNC machining are arranged in the appropriate sequence according to the material, hardness, dimensional tolerance and final application requirements.

05 Surface Finishing

Blasting, polishing, passivation, black oxide, plating, coating or other finishes are applied according to appearance and performance requirements.
 

06 Inspection & Delivery

Parts are checked before shipment based on drawings, samples, agreed inspection items and customer requirements.
 
 

Investment Casting Services

Investment casting is the core manufacturing process at Zeren. It is suitable for custom metal components with complex shapes, detailed features, curved surfaces, internal structures or near-net-shape requirements. Compared with machining parts directly from solid material, investment casting can reduce material waste and machining workload for many complex components.

We mainly support custom steel investment castings for industrial applications, including stainless steel, carbon steel, alloy steel, duplex stainless steel, heat-resistant steel and wear-resistant steel parts. For projects that require functional dimensions after casting, CNC machining, heat treatment and finishing can be arranged as part of the same manufacturing workflow.
Custom steel investment castings for industrial components and machinery parts
Suitable for

Complex Geometry Parts

Parts with curved profiles, ribs, bosses, brackets, irregular shapes or difficult-to-machine structures.

Small-to-Medium Batch & Repeat Production

Projects that need more stable repeatability than one-off fabrication or manual processing.

Functional Industrial Components

Pump parts, valve components, impellers, fittings, machinery parts, hardware components and custom equipment parts.

Casting + Machining Projects

Parts that require cast shape first, then machined holes, faces, threads or assembly areas.
What We Can Support
Lost wax casting

Silica sol investment casting

Custom steel investment castings

Complex shape casting

Small and medium-sized precision components
 
Machining allowance planning

Surface cleaning and finishing

Heat treatment coordination

Drawing-based inspection

Sample and batch production support
 

Tooling & 3D Printing Support

Casting mold, wax patterns and 3D printed prototypes for investment casting development
Reliable casting starts with suitable tooling and pattern preparation. For repeat production, we usually recommend production tooling to improve wax pattern consistency, dimensional stability and batch repeatability. For prototype or early-stage projects, rapid casting and 3D-printed pattern support may help customers verify structure, fit and casting feasibility before investing in full production tooling.

Our team can review part structure, expected quantity, accuracy requirements and project stage, then recommend a suitable tooling or prototype path.
Production Tooling
Prototype Tooling
Rapid Casting Support
Suitable for stable repeat orders, regular production and parts that require better wax pattern consistency.
Suitable for sample development, design adjustment and projects where the final structure may still change.
Suitable for complex prototypes, low-volume testing or early design verification before full tooling investment.
When This Capability Helps
New product development
Design verification before batch production
Complex parts that need casting feasibility review
Low-volume sample projects
Projects with uncertain annual demand
 

CNC Machining for Investment Cast Parts

Many investment cast parts still require CNC machining after casting, especially when the part includes threaded holes, sealing faces, precision bores, flat mounting areas, grooves or assembly dimensions. Zeren supports casting and machining together, helping customers reduce communication between separate suppliers and improve consistency between the cast blank and final machined part.

Before production, we can review machining allowance, datum selection, tolerance requirements and surface areas that need to be protected during later processes.
Investment cast blank and CNC machined finished part showing machining capability

Threaded Holes & Tapped Features

 
Machining support for threaded holes, tapped holes and fastening areas required for final assembly.

Sealing & Mounting Surfaces

 
Flat machining for sealing faces, contact surfaces, mounting areas and functional assembly planes.

Precision Bores & Grooves

 
Boring, drilling, milling and groove machining for parts with controlled internal or external features.

Casting-to-Machining Coordination

Machining allowance and fixture planning are considered together with casting feasibility to reduce production risk.
Typical Machined Features
Hole & Thread Features
Threads / Bores / Assembly Holes

Surface Features
Mounting Faces / Sealing Faces / Positioning Surfaces

Slot & Groove Features
Slots / Grooves / Keyways

Edge & Detail Features
Chamfers
 

Heat Treatment Services

Heat treatment can improve the mechanical performance of cast steel components. Depending on the material grade, hardness requirement and manufacturing route, it may be arranged before or after CNC machining. 
 
Depending on the material grade and working condition, heat treatment may be used to improve hardness, strength, toughness, wear resistance, fatigue performance or dimensional stability.

Zeren can coordinate heat treatment requirements as part of the full casting project, especially for alloy steel, carbon steel, wear-resistant steel and selected stainless steel components.
Steel castings prepared for heat treatment and hardness inspection

Quenching

Used to increase hardness and strength for suitable steel grades.
 
 

Tempering

Used after quenching to adjust hardness, reduce brittleness and improve toughness.
 

Annealing

Used to soften material, improve machinability or reduce internal stress.
 
 

Normalizing

Used to refine structure and improve mechanical consistency for selected steel castings.

Carburizing

Used when a hard wear-resistant surface and tougher core are required.
 
 

Nitriding

Used to improve surface hardness, wear resistance and fatigue performance for suitable materials.
 
Common Goals of Heat Treatment
Improve hardness
Improve strength
Improve toughness
Improve wear resistance
Reduce internal stress
Improve machinability
Support final performance requirements
 

Surface Finishing Services

metal-surface-finishing-options.jpg
Surface finishing helps improve the appearance, corrosion resistance, cleanliness, wear performance and final usability of cast and machined parts. The right finishing method depends on the material, working environment, required appearance, corrosion exposure, assembly condition and cost target.

Zeren can support different finishing options after casting and machining, helping customers receive parts closer to final assembly or end-use condition.

Cleaning & Surface Preparation

Shot blasting, sand blasting and surface cleaning are used to remove scale, improve surface condition and prepare parts for later finishing.

Protective Coatings & Corrosion Protection

Passivation, blackening, electroplating and powder coating can be selected to improve corrosion resistance, surface protection and appearance based on the material and service environment.

Polishing & Appearance Finishing

Manual polishing, mechanical polishing and electropolishing can be selected based on appearance, roughness and material requirements.

Functional Surface Finishing

Selected finishes can support wear resistance, smoother contact surfaces, improved cleanliness or better product appearance.
 

Quality Control Throughout Casting, Machining and Finishing

Quality control is built into each stage of the manufacturing process, from drawing review and material confirmation to casting inspection, machining checks, surface condition review and final shipment inspection. 

For custom industrial components, we focus on dimensional accuracy, material consistency, surface quality and functional requirements based on the drawing or approved sample.
Quality control inspection for investment cast and CNC machined metal parts

Drawing & Requirement Review

We check drawings, tolerances, material grades, finishing requirements and special notes before production.

Material Verification

Material selection and composition requirements can be reviewed according to customer specifications.

In-Process Inspection

Casting, machining and finishing stages are checked to reduce production risk before final inspection.

Dimensional Inspection

Key dimensions, machined areas and assembly features are checked according to drawings or samples.

Final Inspection Before Shipment

Finished parts are reviewed for dimensions, surface condition, quantity and packaging before delivery.

Materials We Work With

Steel investment castings made from stainless steel, carbon steel, alloy steel, duplex steel, heat resistant steel and wear resistant steel
Different applications require different material performance. Zeren supports a range of steel materials for custom investment casting and secondary machining, including stainless steel, carbon steel, alloy steel, duplex stainless steel, heat-resistant steel and wear-resistant steel. 

Our team can review the working environment, strength requirement, corrosion exposure, temperature condition and machining needs before recommending a suitable material option.

Stainless Steel

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For corrosion-resistant components used in pumps, valves, hardware, marine equipment and industrial assemblies.

Carbon Steel

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For cost-effective structural and machinery components requiring strength and machinability.

Alloy Steel

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For parts requiring higher strength, toughness, hardenability or wear performance after heat treatment.

Duplex Stainless Steel

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For demanding corrosion environments where higher strength and better resistance are required.

Heat-Resistant Steel

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For components exposed to elevated temperature or thermal working conditions.
 

Wear-Resistant Steel

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For parts used in abrasive, impact or high-friction working environments.
 

Industries and Typical Components We Support

 
Our capabilities are mainly used for custom industrial metal components that require casting shape, machined features, stable material performance and suitable surface finishing. 
 
We support projects across pump and valve, industrial machinery, petrochemical and marine, transportation, power engineering, instrumentation, hardware and other custom equipment applications.
Investment cast pump and valve components including impellers, valve parts and fittings

Pump & Valve Components

Impellers, valve bodies, fittings, pump accessories, flow-control parts and sealing-related components.
Custom investment cast industrial machinery parts including brackets, connectors and equipment components

Industrial Machinery Parts

Machine brackets, equipment components, connecting parts, wear parts and structural casting components.
Corrosion resistant steel casting parts for petrochemical and marine applications

Petrochemical & Marine Parts

Corrosion-resistant cast parts, pipe-related fittings, marine hardware and equipment components.
Custom investment cast transportation components for vehicle, motorcycle and equipment applications

Transportation Components

Custom vehicle, motorcycle and transport equipment parts requiring casting and machining support.
Precision investment cast parts for power equipment, instruments and mechanical assemblies

Power & Instrument Components

Precision cast parts for power equipment, instruments, turbines and functional mechanical assemblies.
Custom stainless steel hardware and architectural investment casting components

Hardware & Architectural Parts

Custom hardware, brackets, locks, handles, decorative metal parts and functional building components.

Why Customers Choose Zeren for Casting and Machining Projects

 
For custom metal parts, production success depends not only on the casting process itself, but also on how tooling, machining, heat treatment, finishing and inspection are coordinated. 
 
Zeren helps customers manage these steps within one manufacturing workflow, reducing communication gaps and improving project consistency from sample development to repeat production.

Integrated Manufacturing Workflow

Casting, machining, treatment, finishing and inspection can be coordinated together instead of handled by multiple separate suppliers.
 

Engineering Review Before Production

We review drawings, samples, 3D models, machining areas, material requirements and finishing needs before starting production.
 

Export-Oriented Communication

We support international customers with drawing review, RFQ communication, sample updates, packaging and shipment coordination.
 

Flexible Project Support

We can support prototype development, sample validation, small-batch projects and repeat production depending on customer requirements.
 

Practical Process Selection

Our team helps choose suitable casting, tooling, machining and finishing routes based on part structure and final application.
 
 

FAQs About Our Investment Casting Capabilities

Q1. What manufacturing capabilities does Zeren provide?

Zeren provides custom investment casting, tooling and 3D printing support, CNC machining, heat treatment, surface finishing and quality inspection for industrial metal components. We can support projects from drawing review to finished parts.
Q2. Can you provide both casting and CNC machining?
 
Yes. Many cast parts require CNC machining after casting, such as threaded holes, sealing faces, mounting surfaces, precision bores and assembly features. We can coordinate casting and machining together to improve production consistency.
Q3. What materials can you cast?
 
We mainly support steel investment castings, including stainless steel, carbon steel, alloy steel, duplex stainless steel, heat-resistant steel and wear-resistant steel. The final material should be selected according to the working environment, mechanical requirements and cost target.
Q4. Can you help with new product development?
 
Yes. Customers can send 2D drawings, 3D models or physical samples. We can review casting feasibility, tooling options, machining requirements and surface finishing needs before production.
Q5. Do you support prototype or low-volume casting projects?
 
For selected projects, we can support prototype development, rapid casting or sample validation before full production tooling. The best option depends on part structure, accuracy requirements, quantity and project stage.
Q6. What surface finishes can you provide?
 
We can support shot blasting, sand blasting, mechanical polishing, electropolishing, passivation, black oxide, electroplating, chrome plating, e-coating and powder coating, depending on the material and application.
Q7. Can you arrange heat treatment for cast parts?
 
Yes. Heat treatment options may include quenching, tempering, annealing, normalizing, carburizing and nitriding. The suitable process depends on the material grade and performance requirements.
Q8. What information should I provide for a quotation?
 
Please send 2D drawings, 3D models, material requirements, quantity, surface finishing requirements, heat treatment requirements and any special inspection or packaging needs. If drawings are not available, a physical sample or clear photos may also help.
Looking for a reliable supplier for custom investment cast and machined metal parts? Send us your drawings, 3D models, samples or project requirements. 
 
Our team will review the material, structure, casting feasibility, machining areas, finishing needs and production plan before providing feedback.
 

Send Us Your Drawings for Casting and Machining Review

If you have any questions or project requirements, please contact us through the form and we will respond within 6 hours.
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