Tempering Services

Processing Overview

Description: Tempering is performed by heating the quenched steel to 150-650°C, holding for 1-2 hours, and then air cooling to reduce the hardness (HV 200-600) and optimize toughness. The process involves preheating, holding at a constant temperature, and slow cooling, taking 1-3 hours.

Applicable Materials: Carbon and alloy steels after quenching.

Visual Appearance: The surface may have a light blue or golden hue (oxide layer) with no noticeable grain.

• Improved toughness: Reduces brittleness and enhances impact resistance.
• Stress relief: Eliminates quenching residual stresses and prevents cracking.
• Hardness adjustment: Controls the temperature between 150-650°C to achieve the desired hardness range.
• Dimensional stability: Minimal variation maintains tolerances.
• Improved durability: Balances hardness and ductility for extended life.
• Economical: Simple process, suitable for mass production.

• Temperature Control: 150-650°C (higher temperatures reduce hardness); test material response.
• Cooling Rate: Air cool to avoid quenching effects; test for uniformity.
• Surface Protection: Use a protective atmosphere to prevent oxidation; check color.
• Design Considerations: Ensure uniform wall thickness and avoid heat-sensitive areas.
• Quality Standards: Comply with ASTM E10; check hardness and toughness.
• Safety Measures: Protect against high-temperature operation and control exhaust gases.

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