Cns Suj2 Steel Quenching And Tempering Process - China

The quenching and tempering process for CNS SUJ2 steel primarily includes the following steps:

1 - Normalizing

- Purpose: Refines grain size, improves machinability, and reduces internal stress.

- Process Parameters: Heating to 872°C, followed by slow cooling.

2 - Austenitizing

- Purpose: Forms austenite in CNS SUJ2 steel, preparing it for quenching.

- Process Parameters: Heating to 850–860°C.

3 - Quenching

- Purpose: Forms a martensitic structure through rapid cooling, improving hardness and wear resistance.

- Process Parameters: After heating at 850–860°C, oil quenching is used.

4 - Tempering

- Purpose: Reduces brittleness and maintains a balance between hardness and toughness.

- Process Parameters: Tempering is typically performed at 150–200°C.

High-temperature tempering (650–700°C) reduces hardness and improves toughness and dimensional stability.

Performance after Quenching and Tempering

- Hardness: After quenching and tempering, CNS SUJ2 steel typically achieves a hardness between HRC 60–64.

- Mechanical Properties: High hardness, good wear resistance, and fatigue resistance.

These process parameters and steps ensure that CNS SUJ2 steel achieves ideal mechanical properties after quenching and tempering, making it suitable for applications subject to high stress and wear resistance.

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