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Wear-Resistant Cr12 Piston Shaft | Hydraulic Cylinder Component | HRC50-55 Hardness
Header include
This product is a key moving component specially designed for hydraulic transmission systems - a high-precision piston shaft assembly. Cr12 cold working die steel is selected as the base material. Through heat treatment, a core hardness of HRC50-55 is obtained, and a hard chromium plating surface treatment process is adopted to achieve excellent wear resistance and corrosion resistance, ensuring long-term stable operation under high-pressure and high-frequency working conditions.
Abject of manufacture
1.Base material characteristics: Cr12, as a high-carbon and high-chromium cold work die steel, features excellent hardenability, wear resistance and dimensional stability. Its alloy composition can effectively resist high-pressure deformation and wear.
2.Heat treatment status: The overall quenching + medium-temperature tempering process is adopted to make the material reach the optimal hardness range of HRC50-55.
3.Surface treatment: After fine processing, it is treated with hard chromium plating. The coating is dense and uniform, and has the dual functions of wear resistance and corrosion resistance.
Core features and requirements
1.The optimized hardness ratio: The hardness range of HRC50-55 not only ensures the material's sufficient wear resistance but also retains the necessary toughness, effectively preventing brittle fracture under high-pressure impact loads.
2.Outstanding surface performance: The hard chromium plating layer provides:
(1)The surface hardness reaches HV800-1000
(2)The coefficient of friction is reduced by more than 40%
（3)The corrosion resistance is enhanced by 5 to 8 times
3.Precise fit characteristics: Requirements for the fit surface between the piston shaft and the seal:
(1)The roundness error is ≤0.005mm
(2)The straightness error is ≤0.008mm/300mm
(3)The surface roughness Ra is no more than 0.2μm
Key processes and technologies
1.Optimization of material pretreatment:
(1)Spheroidizing annealing process is adopted to ensure uniform distribution of carbides
(2)Stress relief annealing is carried out after rough machining to eliminate processing stress
2.Innovation in heat treatment process
(1)The step quenching process is adopted to control the transformation of martensite
(2)Three tempering treatments are carried out to ensure uniform hardness
(3)Deep cryogenic treatment (-196℃) stabilizes the structure and enhances dimensional stability
3.Precision manufacturing technology
(1)It adopts a combined process of CNC precision turning and precision grinding
(2)Finish machining is carried out using CBN super-hard tools
(3)The online measurement system monitors the dimensional accuracy in real time
4.Surface engineering treatment
(1)Micro-crack chromium electroplating process, coating thickness 0.015-0.025mm
(2)Super-fine grinding after plating to ensure dimensional accuracy
(3)Micro-porous chromium treatment enhances oil storage performance
Conclusion
This Cr12 piston shaft assembly has achieved a perfect combination of high-strength base and high-performance surface through the coordinated optimization of material selection, innovative heat treatment process and surface engineering treatment. Its hardness ratio of HRC50-55 and hard chromium plating surface treatment complement each other, ensuring not only the wear-resistant service life of parts in high-pressure hydraulic systems but also the accuracy of the fit with seals. It has become a key guarantee for enhancing the reliability of hydraulic systems and extending maintenance cycles, and is particularly suitable for hydraulic transmission applications in automated equipment that require high loads and long service lives.
Wear-Resistant Cr12 Piston Shaft | Hydraulic Cylinder Component | HRC50-55 Hardness
Header include
This product is a key moving component specially designed for hydraulic transmission systems - a high-precision piston shaft assembly. Cr12 cold working die steel is selected as the base material. Through heat treatment, a core hardness of HRC50-55 is obtained, and a hard chromium plating surface treatment process is adopted to achieve excellent wear resistance and corrosion resistance, ensuring long-term stable operation under high-pressure and high-frequency working conditions.
Abject of manufacture
1.Base material characteristics: Cr12, as a high-carbon and high-chromium cold work die steel, features excellent hardenability, wear resistance and dimensional stability. Its alloy composition can effectively resist high-pressure deformation and wear.
2.Heat treatment status: The overall quenching + medium-temperature tempering process is adopted to make the material reach the optimal hardness range of HRC50-55.
3.Surface treatment: After fine processing, it is treated with hard chromium plating. The coating is dense and uniform, and has the dual functions of wear resistance and corrosion resistance.
Core features and requirements
1.The optimized hardness ratio: The hardness range of HRC50-55 not only ensures the material's sufficient wear resistance but also retains the necessary toughness, effectively preventing brittle fracture under high-pressure impact loads.
2.Outstanding surface performance: The hard chromium plating layer provides:
(1)The surface hardness reaches HV800-1000
(2)The coefficient of friction is reduced by more than 40%
（3)The corrosion resistance is enhanced by 5 to 8 times
3.Precise fit characteristics: Requirements for the fit surface between the piston shaft and the seal:
(1)The roundness error is ≤0.005mm
(2)The straightness error is ≤0.008mm/300mm
(3)The surface roughness Ra is no more than 0.2μm
Key processes and technologies
1.Optimization of material pretreatment:
(1)Spheroidizing annealing process is adopted to ensure uniform distribution of carbides
(2)Stress relief annealing is carried out after rough machining to eliminate processing stress
2.Innovation in heat treatment process
(1)The step quenching process is adopted to control the transformation of martensite
(2)Three tempering treatments are carried out to ensure uniform hardness
(3)Deep cryogenic treatment (-196℃) stabilizes the structure and enhances dimensional stability
3.Precision manufacturing technology
(1)It adopts a combined process of CNC precision turning and precision grinding
(2)Finish machining is carried out using CBN super-hard tools
(3)The online measurement system monitors the dimensional accuracy in real time
4.Surface engineering treatment
(1)Micro-crack chromium electroplating process, coating thickness 0.015-0.025mm
(2)Super-fine grinding after plating to ensure dimensional accuracy
(3)Micro-porous chromium treatment enhances oil storage performance
Conclusion
This Cr12 piston shaft assembly has achieved a perfect combination of high-strength base and high-performance surface through the coordinated optimization of material selection, innovative heat treatment process and surface engineering treatment. Its hardness ratio of HRC50-55 and hard chromium plating surface treatment complement each other, ensuring not only the wear-resistant service life of parts in high-pressure hydraulic systems but also the accuracy of the fit with seals. It has become a key guarantee for enhancing the reliability of hydraulic systems and extending maintenance cycles, and is particularly suitable for hydraulic transmission applications in automated equipment that require high loads and long service lives.
