| Solid Nitrided Stainless Steel Valve Seats | ||
| 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 Seat accuracy | ≤ 0.025 mm | ≤ 0.005 mm (Ultra-High Precision) |
| Processing Seat Roundness | ≤ 0.025 mm | ≤ 0.011 mm (Micron-Level ) |
| 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 |
The Art of Surface Hardening: Synergy of Depth, Hardness, and Integrity
The Nitrided Stainless Steel valve Seats we offer are far from a simple heat treatment; they represent a controlled and precise surface engineering feat.
A Robust Substrate with Deep Reinforcement
Our process begins with selected stainless steel seat blanks. Through controlled plasma nitriding or gas nitriding, nitrogen atoms diffuse deep below the surface, forming a uniform, metallurgically bonded nitride layer. This creates a true Solid nitrided valve seats-where the strengthening layer is an integral part of the substrate, not a fragile coating, fundamentally eliminating the risk of spallation.
Dual Enhancement of Hardness and Corrosion Resistance
This nitride layer is the key to the performance leap of Hardened Nitrided valve seats. It not only imparts exceptional surface wear resistance, anti-galling properties, and fatigue resistance, significantly extending valve life in applications with frequent cycling or media containing fine particles; simultaneously, the dense nitride layer itself offers good resistance to many media, working synergistically with the stainless steel substrate to provide dual protection.
Designed for Demanding Frictional Service
Consequently, Nitrided SS valve Seats are particularly suited for applications where the medium is corrosive but also involves significant fretting wear, abrasive wear, or where sealing surface galling must be prevented. For instance, in the chemical, pulp & paper, marine, and energy sectors, when handling corrosive fluids with minor solid particulates, they often offer better overall cost-effectiveness than either purely high-hardness materials or high-alloy materials alone.
Why Choose TongBall's Nitrided Stainless Steel Valve Seat Technology?
A Targeted Problem-Solver
We precisely address the combined "corrosion + wear" service conditions, offering a cost-effective, high-performance alternative to avoid using prohibitively expensive super-alloys.
Comprehensive Performance Verification
We provide not only hardness test reports but also, upon request, data such as metallographic analysis of the nitrided layer and comparative corrosion resistance tests, making performance visible and verifiable.
Precise Control of Process Parameters
We strictly control nitriding temperature, time, and atmosphere to achieve high hardness without compromising the corrosion resistance of the stainless steel substrate, avoiding the precipitation of brittle phases caused by "over-nitriding."
Applicable to Complex Geometries
The nitriding process offers excellent uniformity, ensuring consistent hardening effects on critical sealing surfaces even for seats with complex geometries, with no untreated areas.
When your application demands resistance to both the chemical attack of the medium and the physical wear of mechanical surfaces, there's no need to struggle with a difficult choice between two premium materials. TongBall's Solid Nitrided Stainless Steel Valve Seat technology, through a refined surface engineering process, enables a single, high-quality material to shoulder a dual mission, maximizing both performance and value.
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