News

Precision castings of ductile iron pipes and horizontally continuous cast ductile iron profiles. The physical properties such as specific gravity, thermal conductivity, and electromagnetic properties of rare earth magnesium ductile iron were determined, and the influence of graphite and matrix structure on the properties of ductile iron was studied in combination with metallographic standards. Systematically measured various properties of ferritic ductile iron under normal temperature, low temperature, static and dynamic conditions. In addition, the stress-strain properties, low energy multi impact resistance, and fracture toughness of rare earth magnesium ductile iron were studied and began to be used to guide production. In combination with the application of ductile iron gears, the bending fatigue strength and contact fatigue strength of ductile iron, as well as the pitting and peeling mechanisms of ductile iron gears, were systematically studied.

Name: Precision Casting Cabinet Parts

Type: Load bearing structural components

Model: 40Cr steel

Brand: Precision Casting

Customization: can be customized according to customer needs

Project Number: YSMP

Description: Casting of Hardware Tools

Precision casting process: investment casting

Materials: Carbon steel casting, carbon alloy steel casting

1. Good casting quality and low cost;

2. No material limitation, suitable for all sizes;

3. Size

4. High precision, smooth surface, reduces cleaning and saves machining;

5. Significant reduction of internal defects and dense organization;

6. It can achieve large-scale and mass production. Automated assembly lines are environmentally friendly.

7. It can greatly improve the working environment, reduce labor intensity, and decrease energy consumption.

The mechanical properties of gray cast iron are related to the microstructure of the matrix and the morphology of graphite. The flake graphite in gray cast iron severely cuts the matrix, causing stress concentration at the graphite tips, resulting in much lower tensile strength, plasticity, and toughness of gray cast iron than steel. However, its compressive strength is comparable to steel, making it one of the commonly used cast iron parts with poor mechanical properties. At the same time, the matrix structure also has a certain influence on the mechanical properties of gray cast iron. The ferrite matrix gray cast iron has coarse graphite flakes, low strength and hardness, so its application is limited; The graphite flakes of pearlite matrix gray cast iron are small, with high strength and hardness, mainly used to manufacture important castings; The graphite flakes of ferrite pearlite matrix gray cast iron are slightly coarser than those of pearlite gray cast iron, and their performance is not as good as that of pearlite gray cast iron. Therefore, gray cast iron with pearlite matrix is commonly used in industry.

The cast pearlite ductile iron crankshaft and cast ferrite ductile iron automotive chassis parts have been successively put into production at China's Second Automobile Factory, Nanjing Automobile Factory, and First Automobile Factory. This marks that the production of as cast ductile iron in China has reached a high level. The adoption of technologies such as external desulfurization, dual melting, instantaneous inoculation, inoculation block technology, as well as audio detection and rapid thermal analysis that are compatible with it, marks the narrowing of the gap between China's large-scale production of automotive ductile iron castings and the international advanced level. |Wuxi foam concrete

(2) The metallurgical factors and corresponding production process measures of large section (wall thickness greater than 120mm) ductile iron were experimentally studied. By using an appropriate amount of yttrium based heavy rare earth composite spheroidizing agent, forced cooling, sequential solidification, delayed inoculation, and adding trace amounts of antimony, bismuth, etc. if necessary, graphite distortion and tissue looseness in the central part of ductile iron castings can be prevented. A large complex structural component weighing 38 tons, a diesel engine block weighing 17.5 tons, and a ductile iron rolling mill with a cross-section of 805mm have been successfully produced.