Quench polish quench (QPQ) coating piston rod
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  • Quench polish quench (QPQ) coating piston rod
  • Quench polish quench (QPQ) coating piston rod
  • Quench polish quench (QPQ) coating piston rod
  • Quench polish quench (QPQ) coating piston rod

Quench polish quench (QPQ) coating piston rod


The QPQ surface treatment, is a thermochemical process for enhancing and modifying metal surfaces. It integrates nitriding and oxidaƟon stages, combining heat treatment with corrosion protecƟon. This technology significantly improves a component's wear, corrosion, and faƟgue resistance. Its corrosion resistance is comparable to that of mulƟ-layer Cu-Ni-Cr plaƟng. Siding wear tests demonstrate that QPQ-treated parts exhibit superior wear resistance and seawater corrosion resistance compared to those subjected to black oxide finishing.

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Why QUNKE
Jiangsu Newqunke Intelligent Technology Co., Ltd.
Jiangsu Newqunke Intelligent Technology Co., Ltd.

Founded in 2008, Wuxi Qunke Machinery Co., Ltd. is a technology-focused enterprise specializing in the R&D, design, mass production and comprehensive solutions of high-performance hydraulic cylinders, pneumatic cylinders and precision hydraulic piston rods.


Headquartered in Wuxi, Jiangsu – a core manufacturing base in the Yangtze River Delta region – the company now covers a total plant area of more than 25,000 square meters and employs hundreds of skilled professionals. Driven by continuous innovation, Qunke develops hundreds of new products each year to meet diverse industrial demands. Its products are widely applied across numerous key sectors, including water conservancy, metallurgy, construction machinery, marine and port equipment, as well as oil fields, mining, piling machinery and excavators.
To support the long-term growth and global layout, Qunke established Jiangsu New Qunke Intelligent Technology Co., Ltd. in 2022 for foreign market expanding and trading. In 2026, we founded Qunke Europe Co., Ltd. , which serves as its European regional headquarters and operation center. The European subsidiary is responsible for local market development, customer sales and support, after-sales service, technical communication and logistics coordination, enabling Qunke to better respond to European customer needs, shorten delivery cycles, and provide efficient, localized services to partners throughout the region. 

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