Key Insights into Construction Machinery Castings: Products, Materials, and Standards

Construction Machinery Castings refer to metal castings used in construction machinery equipment. These castings are typically required to withstand high strength, high wear, and complex working environments, demanding high-quality and performance standards. Below is an introduction to the main products, raw material requirements for pig iron, and related standards:

Main Products

Excavator Components

• Buckets
• Bucket Teeth
• Bucket Edge Plates
• Bucket Connecting Parts

Loader Components

• Buckets
• Rocker Arms
• Articulated Joints

Bulldozer Components

• Track Links
• Drive Wheels
• Support Rollers
• Carrier Rollers

Other Construction Machinery Parts

• Crane Hooks
• Gearbox Housings
• Brake Discs and Brake Drums

Requirements for Pig Iron as Raw Material

Chemical Composition

• Carbon Content: Generally 2.5%–3.6%, ensuring good casting performance.
• Silicon Content: Typically 1.0%–2.0%, improving fluidity and casting toughness.
• Sulfur and Phosphorus Content: Preferably below 0.08% and 0.05%, respectively, to reduce brittleness in castings.

Mechanical Properties

• Pig iron must have good strength and ductility to ensure castings can withstand complex working environments.

Impurity Control

• Should contain low levels of non-metallic inclusions (e.g., oxides, silicates).

Wear Resistance

• For components requiring high wear resistance (e.g., bucket teeth), appropriate amounts of alloying elements such as chromium, manganese, or vanadium can be added.

Product Standards

International Standards

• ASTM A532 (High Chromium Cast Iron): Applicable to wear-resistant castings.
• ASTM A48 (Gray Cast Iron): For general-purpose mechanical castings.
• ISO 1083 (Ductile Cast Iron): Emphasizes toughness and impact resistance.

Chinese Standards

• GB/T 9439-2010 (Gray Iron Castings)
• GB/T 1348-2009 (Ductile Iron Castings)
• GB/T 11352-2020 (Carbon Steel Castings for General Engineering)

Industry Standards

• Customized specifications may exist depending on specific machinery industries (e.g., construction machinery, building equipment).

Additional Considerations

Quality Control

• Strictly monitor the melting process's temperature and chemical composition.
• Conduct non-destructive testing (e.g., ultrasonic, X-ray) to ensure no internal defects in the castings.

Heat Treatment

• Apply heat treatments such as normalizing, quenching, or tempering to certain castings (e.g., high-wear components) to enhance strength and toughness.

Surface Coating

• Casting surfaces are typically coated with anti-rust paint to enhance corrosion resistance.