Crankshaft for chery

For Chery engine models (such as the Acteco series), you should prioritize Forged Steel (40Cr or 42CrMo) for high-performance or turbocharged engines due to its superior tensile strength and fatigue resistance. For standard economy models, Ductile Iron (QT600-3 or QT700-2) is a cost-effective alternative that offers excellent vibration damping. Ensure the supplier provides a Material Analysis Report to verify the chemical composition.

The crankshaft must meet strict dimensional tolerances, typically within 0.01mm to 0.02mm. Key areas to inspect include the Journal Surface Roughness (Ra 0.2-0.4) and Dynamic Balance (usually within 5-10g.cm). Request the supplier to provide a CMM (Coordinate Measuring Machine) Inspection Report to ensure the oil holes and keyways align perfectly with Chery's OEM specifications to avoid engine seizure.

To enhance wear resistance, the crankshaft journals should undergo Induction Hardening or Nitriding, achieving a surface hardness of HRC 45-55. Additionally, Fillet Rolling is a critical technology for Chery crankshafts as it significantly increases the fatigue strength of the fillets, preventing cracks under high-torque conditions.

Suppliers must be certified under IATF 16949:2016, which is the international standard for automotive quality management systems. This ensures the manufacturer follows rigorous APQP (Advanced Product Quality Planning) and PPAP (Production Part Approval Process) protocols, which are vital for maintaining consistency in mass production.

Since crankshafts are heavy and expensive to return, you should mandate a Pre-shipment Inspection (PSI) by a third party (like SGS or Intertek). Focus on Non-Destructive Testing (NDT), specifically Magnetic Particle Inspection (MPI), to detect any sub-surface cracks or flaws that could lead to catastrophic engine failure.

When sourcing on Made-in-China.com, negotiate based on Total Cost of Ownership (TCO) rather than just the unit price. Ask for tiered pricing based on volume (e.g., 50, 200, 500 units) and request a Warranty Period of at least 12 months or 30,000 km. Professional suppliers will often agree to a 1-2% defect allowance or provide spare parts in the next shipment.

Crankshafts are highly susceptible to corrosion and physical impact. Ensure the supplier uses VCI (Volatile Corrosion Inhibitor) film or anti-rust oil, followed by custom-fit wooden crates (IPPC heat-treated). Each unit should be secured to prevent movement, as even minor scratches on the journal surfaces can render the part unusable.

Utilize Secured Trading Services provided by Made-in-China.com to ensure your payment is held in escrow until the shipping documents are verified. For large-scale procurement, use Letters of Credit (L/C) or Telegraphic Transfer (T/T) with a 30% deposit and 70% balance against the Bill of Lading (B/L) copy to balance cash flow and risk.