| Description: | |
| Casting Material: | Austempered Ductile Iron, ADI 900 / QTD 900-8 / JS 900-8 / EN-GJS 900-8 / FCAD 900-8 / ASTM A 897/M-16 900-9 |
| Design Software: | CAD, PRO/E, SolidWorks, UG |
| Casting Process: | Sand Coated Casting, Lost Foam Casting, Investment Casting |
| Heat Treatment: | Austempering |
| Machining: | Casting+CNC Machining |
| Surface finishing: | Shot blasting, Galvanized/Hot Dip Galvanized, Powder coated, Spray painting |
| Package: | Fumigation-free Pallet or Wooden Box |
The control arm (a.k.a. wishbone or track arm) is the critical suspension link that keeps your wheel aligned and the tire flat on the road. It absorbs braking, cornering and impact loads while allowing the wheel to move up and down. Most common failure point: the in-board rubber-bushing eye. Fatigue cracks start here because the arm must twist millions of cycles under shock load—exactly why the material choice matters.
2× fatigue life of forged steel at the same section size.
30 % lighter than steel weldments—lower unsprung mass = better fuel economy & ride.
Exceptional damping; ADI absorbs vibration, extending bushing and ball-joint life.
Net-shape casting = complex geometry in one shot, zero weld seams or stress risers.
Cost stability—no nickel or moly price spikes like high-strength steels.
| Property | Value / Requirement | Unit | Remarks |
|---|---|---|---|
| Tensile strength Rm | ≥ 900 | MPa | Mill test 900-980 |
| Yield strength Rp0.2 | ≥ 650 | MPa | +50 MPa vs 2020 edition |
| Elongation after fracture A | ≥ 7 | % | Min. for grade ADI 900-7 |
| Brinell hardness HBW | 270-340 | - | Guidance, wall ≤30 mm |
| Impact energy KV (un-notched, room temp.) | ≥ 90 | J | Mill test 90-110 |
| Rotating-bending fatigue limit σw | 450-550 | MPa | ~25 % above ADI 800 |
| Contact fatigue limit σH | 1800-2200 | MPa | Comparable to case-hardened steel |
| Modulus of elasticity E | ≈ 169 | GPa | Same as QTD800 |
| Density ρ | 7.1 | g·cm⁻³ | ~10 % lighter than steel |
| Graphite nodularity | ≥ 85 | % | GB/T 24733-2023 requirement |
| Graphite count | ≥ 100 | pcs/mm² | Same as above |
| Matrix structure | Ausferrite + trace carbides | - | Other phases <5 % |
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