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Custom CNC machining service: Unveiling the Benefits of QPQ(Quench-Polish-Quench) Surface Treatment


Custom CNC machining service: Unveiling the Benefits of QPQ(Quench-Polish-Quench) Surface Treatment 1

I. Process:

The QPQ surface treatment follows a meticulous procedure:

1. Quenching:

Elevate the metal component's temperature, swiftly immerse it into a quenching medium, creating a hardened decarburized layer.


2. Polishing:

Post-quenching, polish the component to eliminate irregularities, enhancing both the surface finish and aesthetic appeal.


3. Quenching (again):

Subject the polished component to a secondary quenching process at a lower temperature to alleviate internal stresses and enhance overall toughness.



II. Applicable Materials:

QPQ treatment is suitable for diverse steel alloys:

1. Carbon steels:

Applied to 1045, 4140, and 4340, common in automotive, machinery, and tooling industries.


2. Alloy steels:

Beneficial for 8620, 52100, and 9310 due to enhanced mechanical properties and wear resistance.


3. Stainless steels:

Certain grades, like 17-4 PH, undergo QPQ treatment for increased surface hardness and corrosion resistance.

Custom CNC machining service: Unveiling the Benefits of QPQ(Quench-Polish-Quench) Surface Treatment 2


III. Characteristics:

Key features of QPQ surface treatment:

1. Increased hardness:

Forms a hardened decarburized layer, enhancing hardness and wear resistance.


2. Enhanced corrosion resistance:

Creates a thin decarburized layer, boosting resistance to corrosion.


3. Dimensional stability:

Produces minimal dimensional changes, ensuring stability in treated components.


4. Improved surface finish:

Polishing post-quenching provides a smooth and visually appealing appearance.



IV. Advantages and Disadvantages:

Benefits of QPQ surface treatment:

1. Superior hardness and wear resistance, extending component lifespan.

2. Enhanced corrosion resistance, reducing the need for additional protective coatings.

3. Dimensional stability ensures precise fit and functionality.

4. Improved surface aesthetics, enhancing overall appearance.



1. Limited applicability to specific materials and components.

2. Requires specialized equipment and expertise for the QPQ process.

3. Potential for distortion or warping during quenching.



V. Applications:

QPQ treatment finds applications in diverse industries:

1. Automotive:

Engine components, transmission parts, and suspension components benefit from enhanced wear and corrosion resistance.


2. Aerospace:

Critical components like landing gear, hydraulic systems, and engine parts undergo QPQ treatment for improved durability.


3. Tooling and machinery:

Cutting tools, dies, molds, and machine components benefit from QPQ treatment, ensuring extended tool life and improved productivity.




Q1. What sets QPQ surface treatment apart from other methods?

A1. QPQ treatment offers superior hardness, wear resistance, corrosion resistance, dimensional stability, and improved aesthetics compared to many other surface treatments.


Q2. Is QPQ treatment suitable for all steel types?

A2. While commonly applied to carbon steels, alloy steels, and certain stainless steels, the specific material composition and desired outcomes should be considered for suitability.


Q3. Does QPQ treatment impact the dimensions of the treated component?

A3. The QPQ process minimally alters dimensions, ensuring relative stability in the treated component's overall size.

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