Cast Steel Frame Castings

We support casting production with three main material types, each tailored to different application scenarios and performance demands, ensuring optimal cost-performance ratio for our customers:

Carbon Steel: Cost-effective, with excellent machinability and sufficient strength, suitable for standard-load frame components, widely used in general commercial vehicle chassis.

Alloy Steel: High tensile strength, impact resistance, and fatigue resistance, ideal for high-load, harsh working conditions (such as heavy-duty trucks, engineering vehicles), effectively extending component service life.

Ductile Iron (Nodular Cast Iron): Balances strength and toughness, with good shock absorption and wear resistance, suitable for components requiring stable performance under complex stress.

Our frame castings cover a full range of heavy-duty truck chassis components, supporting one-stop procurement for customers, including but not limited to:

Thrust Rods: Ensure stable vehicle operation, buffer lateral and longitudinal forces during driving.

Leaf Spring Assemblies & Mounts: Bear vehicle weight, absorb road shocks, and maintain driving stability.

Fixing Brackets: For securing engines, transmissions, axles, and other key components, with high positioning accuracy.

Exhaust Pipes & Manifolds: High-temperature resistance, corrosion resistance, ensuring smooth exhaust and reducing noise.

Shock Absorber Brackets: Connect shock absorbers to the frame, enhance vibration isolation effect, and protect chassis components.

We also accept customized casting production according to customer drawings, samples, and specific dimensional requirements, covering all types of frame-related castings for heavy trucks.

To meet different performance requirements of components under various working conditions, we provide a full range of professional heat treatment services, including:

Annealing: Reduce internal stress, improve material toughness and machinability.

Quenching & Tempering: Enhance material strength, hardness, and wear resistance, adapting to high-load components.

Normalizing: Refine grain structure, improve material uniformity and mechanical properties.

Our heat treatment process is strictly controlled, complying with international standards, to ensure consistent performance of each casting.

To extend the service life of frame castings in harsh environments (such as humidity, dust, and corrosion), we provide professional surface anti-rust treatment services, including:

Hot-Dip Galvanizing: Excellent corrosion resistance, suitable for long-term outdoor use.

Electrophoretic Coating: Uniform coating, strong adhesion, effectively preventing rust and corrosion.

Paint Spraying: Customizable colors, good decorative and protective effects, adapting to different customer needs.

1.1 Product Name and Application

This product is an integrated frame cing (hereinafter referred to as "casting"), which is a core load-bearing component for various types of mechanical equipment (automobiles, construction machinery, special equipment, etc.). mainly used to support the powertrain, suspension system, and body structure. Through a frame design consisting of longitudinal and cross beams, it achieves load transfer, structural stability, and resistance todeformation, serving as a key basic component to ensure the operational safety and reliability of the equipment.

 

1.2 Product Structural Features

Adopts a "Lu-shaped" structure enclosed by longim assemblies and cross beam assemblies (or according to actual product design descriptions, such as an integrated die-casting structure), enhancing overall structural strength and torsional stiffness while avoiding stress conion; Uniform wall thickness design, with key areas adopting a 3-8mm gradient wall thickness (specific to product drawings), using sloped transitions (slope ≤1:uce material accumulation and lower the risk of shrinkage cavities and porosity; Ribs arranged along the direction of force flow, featuring variable cross-section design and R≥5mm arctransitions; unloading grooves are set in the middle of long ribs to improve crack resistance and structural flexibility; Integrated mounting interfaces, reserving assembly positions for suspension, shock absobers, seats, etc., reducing subsequent welding and splicing processes and improving assembly efficiency.

 

2.1 Material Properties Material Grade

Tensile Strength Yild Strength Elongation Brinell Hardness Applicable Standard HT-250 (Grey Cast Iron) ≥20MPa ≥140MPa ≥3% 187-255HB GB/T 43653-2024 AlSi7Mg (Alumnum Alloy) ≥240MPa ≥120MPa ≥10% 70-100HB G/T 43653-2024 (To be filled according to actual material) (Test value) (Test value) (Test value) (Test value) (Corresponding standard)

 

2.2 Dimensiod Tolerances

Overall dimensions: Length × Width × Height = ____mm×____mm×____mm (specific to product drawings); Dimensional tolerance grade8-CT10 (Grey Cast Iron) / CT9-CT11 (Aluminum Alloy), complying with GB/T 6414 "Tolerances for Casting Dimensions, Gtrical Tolerances and Machining Allowances"; Weight tolerance: ±3% (nominal weight ____kg), executing GB/T 11351 "Tolerances for Casing Weights" standard; Surface roughness: Casting surface Ra≤12.5μm, machined surface Ra≤3.2μm, complying wth GB/T 15056 "Method for Assessment of Casting Surface Roughness".

2.3 Quality Requirements Appearance
 

No cracks, cold shuts, or penetrating defects; mounting surfaces free of scrhes, slag inclusions, or dents affecting assembly; brand logo, mold number, and production date are clear and complete; Internal quality: No dense porosity or shrinkage cavitiesitical areas; detection grade ≤2 according to ASTM E505 standard, ≤3 at ejector pin positions; executing GB/T 5677 "Castings - Examination" or GB/T 34904 "Ductile Iron Castings - Ultrasonic Testing"; Metallographic structure: Pearlite content in grey ast iron ≥85%, no network carbides; aluminum alloy free of overheated structures, complying with GB/T 7216 "Metallographic Examination of Grey Cast Ion" or GB/T 9441 "Metallographic Examination of Ductile Iron Castings".

3.1 Process Scheme Ca

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