Graphite chill Introduction

Graphite chill feature outstanding thermal conductivity at high temperatures. They deliver remarkable chilling effect on hot spots of gray iron, ductile iron and steel castings, which effectively eliminates shrinkage cavities and shrinkage porosity defects at casting hot spots.

In addition, graphite chill boast excellent machinability, allowing precise fitting to complex and special-shaped contours of casting hot spots. This further optimizes the chilling performance at hot spots, enhances the density and uniformity of casting microstructure, and reduces internal stress concentration of castings.

Key Technical Specifications

Note: Custom shapes and dimensions of chill iron are available upon customer requirements.

Physical Properties and Advantages

1、Graphite chills feature excellent thermal conductivity, which effectively eliminates shrinkage cavities and microporosity in heavy-section casting zones and enhances the compactness of casting microstructure. DYL-C01 graphite chill is recommended for small and medium castings, while DYL-C02 graphite chill applies to large cross-section castings.

2、Graphite chills possess superior machinability; their shape and dimensions can be customized according to the size and profile of casting hot spots, delivering favorable cost efficiency for mass production.

3、With high refractoriness, dense and smooth surface finish and high dimensional accuracy, graphite chills drastically reduce casting defects such as sand adhesion and fusion bonding at chill-contacted areas.

4、Graphite chills significantly optimize graphite morphology and matrix structure at critical casting sections: for gray cast iron, the type-A graphite at hot spots becomes finer and more tortuous; for ductile iron, graphite nodules increase in quantity, shrink in size, and exhibit superior sphericity and uniformity.

5、Graphite chills boast strong bending resistance and outstanding reusability. Under standardized operation and maintenance, they can be recycled more than 20 times.

Precautions

1、Avoid heavy impact and collision during shakeout, knockout and vibratory conveying to prevent breakage and cracking of graphite chills.

2、After natural cooling, clean chill surfaces with fine steel wire wheels or flap discs. Hard scraping tools are prohibited to avoid surface damage and microcracks.

3、Coat the working surface of chill before reuse, and fully dry the coating in strict accordance with specified drying procedures.

4、After cleaning, conduct routine inspection on surface quality, dimensional tolerance and cracks in accordance with inspection standards. Repair shall be carried out for chills meeting rework criteria. Scrap disposal is required for chills with through cracks, large-area damage, or thickness loss exceeding 2 mm.

5、Before application, implement fixed-position storage and labeled management (specification, recycling count). Store chills in dry and well-ventilated areas to avoid surface corrosion and moisture absorption.