Why Clients Choose YUTONG’s Quenching Tempering Rods

 Quenching and tempering is a heat treatment process that transforms ordinary steel into high-performance alloy rods. Here’s how we ensure every rod meets exacting standards:

1. Material Selection & Preparation

• High-Purity Alloy Steel: We use grades like 4140 hard chrome rod, 4340 chrome plated bar, or custom alloys tailored to client specifications, ensuring optimal carbon content (0.35–0.50%) and traceability.

• Precision Forging: Rods are hot-forged to refine grain structure, eliminating voids and ensuring uniform mechanical properties.

2. Controlled Quenching Process

• Induction Heating: Rapid, uniform heating to 850–950°C (depending on alloy) in inert atmospheres prevents decarburization.

• High-Speed Quenching: Oil, polymer, or water quenching achieves a hardened martensitic structure with minimal distortion.

3. Precision Tempering

• Stress Relief: Tempering at 400–600°C restores ductility while maintaining hardness (typical range: 28–32 HRC to 45–50 HRC).

• Multi-Stage Tempering: For critical applications, double or triple tempering cycles eliminate residual stresses and enhance toughness.

4. Advanced Finishing & Testing

• Peeling/Grinding: CNC peeling machines achieve tight diameter tolerances (±0.05 mm) and surface finishes (Ra ≤ 1.6 µm).

• 100% Non-Destructive Testing (NDT): Ultrasonic testing (UT) and magnetic particle inspection (MPI) detect subsurface flaws.

• Mechanical Certification: Each batch is tested for tensile strength (up to 1,200 MPa), impact resistance (Charpy V-notch), and hardness uniformity.

Our Q&T rods power performance in:

• Automotive: Crankshafts, axle shafts, and suspension components.

• Oil & Gas: Drill collars, valve stems, and downhole tools.

• Construction: Hydraulic cylinder rods, crane pulleys, and heavy-duty fasteners.

• Renewable Energy: Wind turbine shafts and gearbox components.