Custom Cast Iron Parts

Core Composition and Performance Parameters of Mainstream Cast Iron Types

Meituo Metal specializes in the custom production of cast iron parts, focusing on two mainstream categories: ductile iron and gray iron. Both strictly comply with industry production standards, with optimized chemical compositions tailored to different industrial application scenarios to ensure the performance and operational stability of cast iron parts. The following table presents the core composition and key performance parameters of these two cast iron types, which are the actual implementation standards in Meituo's production process, suitable for various industrial customization needs.

Core Principles for Selecting Ductile Iron vs. Gray Iron

The selection of cast iron material directly determines the application effect and service life of custom parts. Combining years of production experience, Meituo's technical team has formulated scientific selection principles centered on the actual operational requirements of parts, accurately matching the usage needs of different industrial scenarios and avoiding part failure caused by improper material selection.

Selection by Load Type

For custom parts subject to tensile loads, impact loads, or alternating loads—such as bearing housings and pump casings—ductile iron is the preferred choice. Its spherical graphite structure effectively disperses stress, preventing cracking or fracture of parts under dynamic stress. The precision of Meituo's ductile iron bearing housings can be controlled within 0.05mm, fully adapting to high-load working conditions. For parts mainly bearing static compressive loads—such as machine tool bases and counterweights—gray iron is the optimal choice. Its flake graphite structure provides excellent compressive performance and can effectively absorb stress generated during equipment operation, improving equipment stability.

Selection by Performance Requirements

For precision equipment accessories with strict requirements for vibration and noise reduction—such as machine tool beds and hydraulic components—gray iron is selected. Its natural vibration-damping properties reduce vibration interference during equipment operation and ensure machining accuracy. For transmission components and engineering machinery parts requiring wear resistance and fatigue resistance, ductile iron is selected for its superior comprehensive mechanical properties, which can adapt to complex working environments.

Selection by Machining Process Requirements

For cast iron parts with complex structures requiring extensive machining, gray iron is preferred. Its chip-breaking property during machining reduces tool wear, improves machining efficiency, and lowers production costs. For parts with relatively simple structures where mechanical properties are more important than machining efficiency, ductile iron is selected. Although it has slightly higher machining difficulty, it eliminates the need for additional reinforcement design, achieving optimal comprehensive costs.

Match Table of Cast Iron Types and Industrial End Applications

Meituo Metal's cast iron parts are widely used in various industrial fields such as home appliances, machinery, pumps and valves, and heavy industry. Combining the usage characteristics of different industries, a standardized material-application matching scheme has been formed. The following table lists the core end-application scenarios of the two cast iron types, which are the mainstream fields where Meituo actually supplies products.

Core Evaluation Dimensions for Custom Cast Iron Part Quality

As a professional manufacturer of cast iron parts, Meituo Metal has established a comprehensive quality inspection system for cast iron parts. Relying on advanced testing equipment such as fluorescence spectrometers, 3D coordinate measuring machines, and salt spray test chambers, we evaluate the quality of cast iron parts from multiple core dimensions to ensure that each product meets customer customization standards and industry requirements. The following are the industry-common quality evaluation dimensions strictly implemented by Meituo.

1. Material Composition Accuracy

The chemical composition of cast iron is the foundation of its performance. Spectrometers and other equipment are used to detect the content of core elements such as carbon, silicon, manganese, phosphorus, and sulfur, ensuring that the composition is within the design standard range with a deviation controlled within 0.1%. This prevents performance non-compliance of cast iron parts caused by composition deviations.

2. Dimensional and Geometric Accuracy

Custom cast iron parts must meet the customer's precise dimensional requirements. The tolerance of key dimensions strictly follows the drawing standards. For example, the hole position accuracy of Meituo's cast iron bearing housings is controlled within 0.05mm, and the flatness and coaxiality deviations of pump bodies do not exceed the design values. At the same time, geometric tolerances including roundness, cylindricity, and parallelism are inspected to avoid assembly and usage issues caused by deformation.

3. Internal and Surface Quality

Internal quality is inspected using X-ray imaging equipment to ensure no shrinkage cavities, porosity, cracks, or other defects inside the cast iron parts. The diameter of air holes in core stress-bearing parts is controlled within 0.1mm. Surface quality requires no sand holes, inclusions, burrs, or other defects, and the surface roughness meets assembly and usage requirements. When necessary, surface treatments such as polishing and electrophoresis are used to improve surface texture and corrosion resistance.

4. Mechanical Performance Compliance

Electronic tensile testing machines, hardness testers, and other equipment are used to detect key mechanical properties such as tensile strength, Brinell hardness, and elongation of cast iron parts, ensuring that all indicators meet the standards of the corresponding cast iron grades. The performance deviation of products in the same batch is controlled within a reasonable range to ensure product consistency.

5. Environmental and Service Performance

For cast iron parts used in special environments such as outdoor, humid, and corrosive conditions, salt spray tests, high and low-temperature tests, etc., are conducted to detect their corrosion resistance and temperature resistance. This ensures that cast iron parts can operate stably for a long time in actual service environments without rust, deformation, or performance degradation.

Quality Assurance System for Meituo's Cast Iron Part Production

Meituo Metal holds multiple quality system certifications such as ISO9001 and IATF16949, and has established a full-process quality control system from raw material procurement, production process, finished product inspection to delivery. Raw materials are selected from high-quality pig iron and undergo multiple composition inspections. The production process strictly follows 5S management standards and adopts advanced casting and machining processes. In the finished product inspection stage, a 100% initial inspection + random re-inspection system is implemented, and comprehensive quality inspection is achieved relying on high-precision testing equipment to ensure that each custom cast iron part meets the customer's industrial application needs. Meanwhile, Meituo can provide complete quality inspection reports according to customer requirements, allowing customers to have a clear understanding of product quality.