| 17-4PH Stainless Steel Valve Balls | ||
| Size Range | 1/2" to 56" (Custom sizes available) | |
| Pressure Rating | PN10-PN420 (Class150-2500) | |
| Body Material | A105, A350 LF2, A182 F304, A182 F316, A182 F321, A182 F51, A182 F53, A182 F55, A182 F60, A182 F44, A564 630 (17-4PH) INCONEL625, INCONEL718, INCONEL825, Monel 400, Monel 500 etc |
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| Core Process/Coating | ENP,HCR,STL6, STL12, STL20,Cr3C2, WC-Co, WC-Cr3C2-Ni, TiC-NiMo, SiC, CrC,ZrO2, Al2O3, Cr2O3, ZnO, TiO, Al2O3-TiO2,STL1, STL6, STL12,Ni60, Ni55, Ni45 etc. | |
| Operating Temperature Range | ≤1200°C | |
| Parameter Category | Core Technical Parameters | Standards for Determining Advanced Technological Level |
| Machining ball accuracy | ≤ 0.025 mm | ≤ 0.005 mm (Ultra-High Precision) |
| Processing ball Roundness | ≤ 0.025 mm | ≤ 0.011 mm (Micron-Level ) |
| Balls concentricity | ≤ 0.025 mm | ≤ 0.005 mm (Ultra-High Precision) |
| Other supplements | ≤ 0.4 μm | ≤ 0.1 μm (Mirror-Level) |
| Parameter Category | Core Technical Parameters | Criteria for High-End Technical Level |
| Coating Thickness Control | Thickness Uniformity | Thickness deviation at any spherical position ≤±8% (stricter than the general ±10% standard) |
| Thickness Tolerance Range | 100 - 300 μm (common range for wear-resistant layers); special ranges can be noted. No missed spraying for ultra-thin coatings (<10μm) | |
| Coating Adhesion Performance | Surface Hardness | HV 1300+ |
| Bond StrengthBond Strength | ≥80 MPa | |
| Interface PorosityInterface Porosity | <0.5% | |
| Coating Surface Quality | Surface Roughness (Ra) | ≤0.2 µm |
| Spraying Accuracy (Positioning & Coverage) | Spraying Positioning Accuracy | ±0.1mm |
Core Product: The Performance Revolution of Precipitation Hardening
Unlike relying on work hardening or coatings for enhancement, 17-4PH valve balls undergo a metallurgical process called "precipitation hardening," where nanoscale strengthening phases form within the material. This achieves a qualitative leap while maintaining good corrosion resistance.
The uniqueness of 17-4PH (also known as grade 630) lies in its ability to achieve high strength through a single low-temperature heat treatment (aging). We can process 17-4PH valve balls to various hardness conditions (e.g., H900, H1025, H1150) based on the final performance requirements. Tensile strength can easily exceed 1000 MPa, and hardness can reach above HRC 40, far surpassing ordinary Stainless Steel valve Balls. This makes them ideal for severe wear, particle erosion, or high sealing specific pressure conditions.
Fortified for High Temperature & High Pressure Environments
For high temperature high pressure valve balls applications, 17-4PH material retains most of its strength at temperatures up to approximately 315°C (600°F), avoiding the risk of tempering softening common with martensitic stainless steels at these temperatures. Our Hardened valve balls offer excellent thermal stability, suitable for steam systems, high-temperature oil & gas, and certain power applications.
Post-Heat-Treatment Machining Ensures Precision
A key challenge with precipitation-hardening materials is controlling distortion after heat treatment. We minimize heat treatment deformation through innovative fixture design and precise aging processes. For ultra-demanding applications, we possess the unique capability for "post-thermal precision machining" of 17-4PH valve balls-performing ultra-precision grinding on the ball after the final aging treatment. This ensures Precision valve balls-level geometric accuracy (such as sphericity and surface finish), perfectly reconciling the often-opposing demands of high strength and high precision.Comprehensive Performance Beyond the Ordinary
Compared to purely martensitic high-carbon steel valve balls, 17-4PH Stainless Steel Valve Balls offer similar hardness and strength while providing superior corrosion resistance (close to 304 stainless) and higher toughness. This avoids the risk of brittle fracture under impact loads associated with high-carbon steel balls, offering a wider safe operating window.
Technical Focus: The Precise Art of Precipitation Hardening
Precise Control of Solution & Aging:
We strictly control solution treatment temperature to ensure complete dissolution of alloying elements, and precisely manage temperature and time during subsequent aging to guide the uniform, fine precipitation of copper-rich phases-key to achieving optimal strength and toughness.
Predicting and Compensating for Dimensional Stability:
Leveraging a rich database of experience, we apply pre-compensation to critical dimensions during machining before heat treatment to offset predictable minor dimensional changes during phase transformation, ensuring the final product meets all drawing specifications.
Comprehensive Performance Verification:
For each batch of 17-4PH valve balls, we conduct not only hardness testing but also metallographic analysis to observe the precipitation state of strengthening phases. We can also provide mechanical test reports (tensile, impact, etc.), offering customers all-around performance data assurance.
Why Choose TongBall's 17-4PH Solution?
Experts in Precipitation Hardening Processes:
We master the complete process chain from material pre-treatment, solution treatment, to aging, and can customize properties based on the end-use, rather than offering a single fixed specification.
Pioneers in Solving the "Strength vs. Precision" Paradox:
Our unique "post-thermal precision machining" capability addresses the industry challenge of achieving high precision in high-strength valve balls, providing customers with a perfect product that delivers both.
Born for Demanding Mechanical Service:
When your application faces high pressure, severe wear, high-frequency operation, or requires exceptional structural integrity from the valve ball, our 17-4PH Stainless Steel Valve Balls are a proven, reliable solution.
Is Your Valve Challenged by Strength, Hardness, or Stability at High Temperatures?
If conventional stainless steel valve balls deform due to insufficient strength or wear quickly due to inadequate hardness, TongBall's 17-4PH Stainless Steel Valve Balls series provides a fundamental solution at the metallurgical level. Let us use controllable phase transformation to bestow upon the valve ball extraordinary sturdiness and precision.
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