Koboer Foundry

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Why Global Leaders
Trust Our Castings

Our ISO 9001:2015 certified quality management system governs every stage of production, from raw material verification to final dimensional inspection, ensuring your components meet the most stringent specifications.

End-to-End Quality Control

From raw material spectral analysis to final 3D scanning, our ISO 9001 certified lab ensures quality at every step.

Proven Scale & Capacity

Our 91,000 m² foundry produces 30,000 tons annually, proving our capacity for large-volume contracts and on-time delivery.

Deep Technical Expertise

With deep metallurgical knowledge, our senior engineers optimize your custom gray iron castings for superior performance and cost-effectiveness

Technical Specification

Gray Iron Technical Specifications: Grades & Properties

At Keboer, Our ISO 9001:2015 certified quality system ensures your components meet precise global specifications. We produce gray iron grades to major international standards like AST M and DIN, verifying material accuracy with an in-house spectrometer before pouring. Rigorous mechanical testing on each production run then confirms all castings meet or exceed required strength and hardness.

Keboer Gray Iron Grades & International Equivalents

Typical Mechanical Properties

KeboerGrade(GB/T9439)	CommonInternationalEquivalents	Typical Applications
HT200	ASTMA48ClaSS30/DIN1691GG20/EN-GJL-200	General-purpose machineryparts,gear cases,protectivecovers.
HT250	ASTMA48ClaSS35-40/DIN1691GG25/EN-GJL-250	Pump bodies, valve casings, machine frames,componentsrequiring higher strength.
HT300	ASTMA48ClaSS45/DIN1691GG30/EN-GJL-300	High-performance CNC machine components, saddles, columns,hydraulic parts.
HT350	ASTMA48ClaSS50/DIN1691GG35/EN-GJL-350	Heavy-duty machine tool bases, press frames, and other high-stress components.

Property	HT200	HT250	HT300	HT350
Tensile Strength (MPa), min	200	250	300	350
Hardness (HBW)	163-255	170-269	207-285	217-293
Graphite Structure	Flake (Type A)	Flake (Type A)	Flake (Type A)	Flake (Type A)
Typical Matrix Structure	Fine Pearlite	Pearlite	Pearlite	Fine Pearlite

Note: The above list is not exhaustive. Contact our engineering team to discuss your specific grade requirements.

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application

Proven Performance Across Key Industries

From CNC machinery and semiconductor equipment to marine and medical applications, we provide robust casting solutions engineered to meet the unique demands and stringent standards of your industry.

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CNC Machinery

General Machinery

Construction & Engineering Machinery

Industrial Automation & Robotics

Marine Equipment

Semiconductor Equipment

Process

Our premium gray iron casting process

As a leading gray iron foundry, we offer two distinct gray iron sand casting processes. This allows us to select the optimal production method based on your part's size, complexity, and precision requirements.

Resin Sand Casting

Best For:Large, heavy, and complex components.

Weight Range:50 kg – 10,000 kg

Key Features:Utilizes wood or metal patterns and a resin-bonded sand mold. Ideal for producing massive, single-piece castings like machine bases and large frames where maximum stability is critical.

Coated Sand Casting

Best For:Small to medium-sized parts requiring high precision and superior surface finish.

Weight Range:Up to 1,000 kg

Key Features:Uses a heated metal pattern to form a thin, rigid sand shell. Delivers excellent dimensional accuracy (within 0.5 mm), a fine surface finish, and is highly suitable for higher volume production runs.

Projects

Keboer's Gray Iron in Action

Heavy-Duty CNC Machine Base

Material:HT350 gray iron casting

Weight:4,519 kg

Process:Resin Sand Casting

Engineered for maximum rigidity and thermal stability, providing the unwavering foundation required for sub-micron precision machining operations.

Cylinder block casting

Material:Gray Iron HT250

Weight:36 kg

Process:Coated Sand Casting

Achieved tight dimensional tolerances and a superior surface finish directly from the mold, significantly reducing subsequent machining requirements and costs for our client.

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Let's Build Your Next Great Component

Whether you have a complete CAD model or are in the early stages of design, we can provide expert guidance on material selection, process optimization, and design for manufacturability to ensure your project's success.

Discuss your specific requirements.

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Premier Gray Iron Casting Manufacturer
for Mission-Critical Machinery

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