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>>> WHY CHOOSE ZEREN

Why Choose Zeren for Custom Investment Casting Projects

From molten steel pouring and tooling development to CNC machining, finishing and final inspection, we manage the key manufacturing stages required for custom steel components.

Our integrated approach helps customers reduce communication gaps between suppliers, identify casting and machining risks earlier, and maintain more consistent control over quality, lead time and repeat production. Every project is reviewed according to its drawing, material, quantity and critical application requirements.

Send Your Drawings

Molten steel pouring during silica sol investment casting production at Zeren foundry

Founded in 2009

Experience supporting custom industrial projects
Investment Casting + CNC Machining

Coordinated manufacturing from casting to finished parts
ISO 9001:2015 Certified

Controlled production and inspection procedures
Global Project Support

Serving OEMs, engineering companies and industrial suppliers

>>> OUR ADVANTAGES

Six Reasons to Work with Zeren

We combine engineering review, silica sol investment casting, CNC machining and measurable quality control to help customers move custom steel components from drawing to repeat production with fewer handoffs and clearer responsibility.

01. Direct Manufacturing Communication

Work directly with a manufacturing team experienced in custom, drawing-based components. Project requirements can be coordinated across quotation, tooling, casting, machining and inspection, reducing information gaps between different production stages.

04. Casting and Machining as One Project

Casting and CNC machining requirements are considered together rather than as separate processes. Machining datums, allowances, clamping areas, critical faces and final dimensional requirements can be evaluated before the castings enter production.

02. Engineering Review Before Tooling

Before tooling and production begin, we review part geometry, wall thickness, fillets, draft angles, tolerances, machining allowances, material requirements and critical dimensions. Potential manufacturing risks can therefore be identified and discussed at an earlier stage.

05. Quality Control Based on Your Drawing

Inspection is planned according to the drawing, material specification and critical product requirements. Available verification may include material analysis, dimensional inspection, hardness testing, CMM measurement, 3D measurement and First Article Inspection records.

03. Steel-Focused Silica Sol Casting

We focus on silica sol investment casting for stainless steel, carbon steel, alloy steel, duplex steel, heat-resistant steel and wear-resistant steel components. The process is suitable for producing complex geometries with controlled dimensional and surface requirements.

06. From Development to Repeat Production

We support projects through tooling development, selected rapid-pattern solutions, sample validation, low-volume production and repeat batch manufacturing. Approved drawings, inspection requirements and production records can be maintained for future orders and design revisions.

Practical Support at Every Project Stage

New Project Development

Review casting feasibility, material requirements and expected production volume before tooling.

Sample and Design Validation

Use production tooling or selected rapid-pattern solutions to verify geometry, dimensions and functional requirements.

Stable Batch Manufacturing

Establish controlled casting, machining and inspection procedures based on approved samples.

Repeat Order Support

Maintain drawings, inspection requirements and production records for future batches and design revisions.

Integrated Manufacturing Makes a Difference

Casting and machining should not be treated as two isolated production stages. By considering final machining requirements before tooling and casting begin, potential dimensional, clamping and deformation risks can be addressed earlier.

CNC machining workshop coordinating precision machining of custom steel investment castings

Machining Allowance Planning

Machining allowances are evaluated according to casting geometry, tolerance requirements and the amount of material needed for stable final machining.

Datum and Clamping Strategy

Machining datums and suitable clamping areas are considered before production to reduce positioning errors and part distortion during machining.

Tolerance and Deformation Control

Critical dimensions, thin walls, heat-treatment effects and potential deformation are reviewed when planning the casting and machining processes.

Coordinated Production Stages

Tooling, casting, heat treatment, CNC machining, surface finishing and inspection are coordinated around the final part requirements.

Quality Supported by Inspection, Not Just Promises

Inspection requirements are defined according to the drawing, material, critical dimensions and intended application. Available verification may include chemical composition analysis, dimensional inspection, hardness testing, CMM measurement, 3D measurement and First Article Inspection records.

CMM dimensional inspection of custom steel investment castings in Zeren’s quality control area

In-Process Inspection

Key dimensions and manufacturing conditions are checked during casting, machining and finishing to identify deviations at an early stage.

Material Verification

Chemical composition and material grades are checked against the specified requirements before parts proceed to final production stages.

Project Documentation

Inspection reports, material records and First Article Inspection documents can be provided according to project requirements.

Final Dimensional Checks

Critical dimensions, tolerances and machined features are verified against the approved drawing before shipment.

Certificate

ISO9001:2015 (NEW 2023 version)
SGS Test Report
Business License
Work Safety Standardization Certificate
China Foundry Association Membership Certificate
ISO9001:2015 (2019 version)
Calibration Certificate
Directions of Calibration
Results of Calibration
Test Report
Construction Project Environmental Impact Assessment Qualification Certificate

ISO9001:2015 (NEW 2023 version)
SGS Test Report
Business License
Work Safety Standardization Certificate
China Foundry Association Membership Certificate
ISO9001:2015 (2019 version)
Calibration Certificate
Directions of Calibration
Results of Calibration
Test Report
Construction Project Environmental Impact Assessment Qualification Certificate

Technical Publications and Foundry Experience

Members of our technical team have contributed practical research and technical articles addressing shrinkage, shell cracking, surface burrs and other investment casting challenges.

Prevention methods for shrinkage cavity and surface burr defects of investment castings

----<<Special-cast and Non-ferrous Alloys>> 2020, (7)

Solution to Shrinkage Cavity and Surface Burrs of Castings with Isolated Thermal Knuckles

----<<Papers of the 16th Annual Meeting of Precision Casting Branch of China Foundry Association>>2019

Solutions of shrinkage in small castings with isolated hot joints

----<<Special-cast and Non-ferrous Alloys>> 2002, (2)

Reconsideration Solutions for shrinkage in small castings with isolated hot joints

----<<Special-cast and Non-ferrous Alloys>> 2002, (6)

Methods of eliminating cracks in silica sol shells and burrs in castings

----<<Special-cast and Non-ferrous Alloys>> 2001, (6)

Solutions of the investment casting enterprise after WTO

----The 8th(2003) Annual Meeting China Foundry Association Investment Casitng Branch

Application example of riser for investment casting

----The 8th(2003) Annual Meeting China Foundry Association Investment Casitng Branch

Technology measures of improvement iron casting structure density in Ⅱ pump body

----<<Modern Vehicle Power>> 1995, (2)

China Authoritative Foundry Magazines

In 2019, we participated in the 16th China Precision Casting Annual Conference, and presented a paper on solutions to shrinkage cavities and surface burrs of castings with isolated thermal joints at the conference, which was appreciated and affirmed by peer experts and scholars of the plenary session, providing a practical and feasible new method for the technological progress of the industry!

The “Prevention methods for shrinkage cavity and surface burr defects of investment castings”

----<<Special-cast and Non-ferrous Alloys>> 2020, (7)

“Solutions of shrinkage in small castings with isolated hot joints”

----<<Special-cast and Non-ferrous Alloys>> 2002, (2)

“Reconsideration Solutions for shrinkage in small castings with isolated hot joints”

----<<Special-cast and Non-ferrous Alloys>> 2002, (6)

Above these three thesises directly rewrote part of the content of the textbook in foundry major in Chinese universities.

In the past ten years, many skilled technicians in the foundry industry have mastered this technology and made great contributions to the technical progress of the foundry industry

Looking for More Than a Casting Supplier?

Send us your drawing, material requirements and expected quantity. Our team will review the casting process, tooling approach, machining requirements and inspection needs for your project.

Send Your Drawing

Finished custom steel investment castings and CNC machined components prepared for project inspection