Products Features
Excellent Hardness and Wear Resistance
Stellite 19 imparts good resistance to abrasive and adhesive wear to the alloy through the formation of uniformly distributed M₇C₃-type carbides. Typical hardness in as-cast or weld-deposited conditions is HRC 38-46 (approximately HV 350-450). Its wear resistance exceeds that of Stellite 6, and its toughness is higher than that of high-carbon grades, making it suitable for applications where moderate wear and moderate impact coexist.
Good High-Temperature Hardness and Oxidation Resistance
Stellite 19 retains approximately 30 HRC hardness at 600°C, about 23 HRC at 760°C (1400°F), and about 18 HRC at 870°C (1600°F). The high chromium content promotes the formation of a dense Cr₂O₃ oxide film on the surface. After exposure to air at 800°C for 1000 hours, the oxidation weight gain is less than 1 mg/cm². Its oxidation resistance is superior to most iron-based wear-resistant materials, making it suitable for high-temperature cyclic applications such as hot shearing and hot extrusion.
Good Corrosion Resistance
With approximately 30% chromium content, Stellite 19 exhibits good corrosion resistance in oxidizing acids (e.g., nitric acid), moderately concentrated non-oxidizing acids (e.g., ≤50% sulfuric acid), and alkaline solutions. In seawater and chloride environments, it primarily shows pitting corrosion rather than uniform corrosion, and maintains stable corrosion resistance in high-temperature atmospheres containing sulfur and chlorine.
Good Machinability and Weldability
Stellite 19 offers better weldability and machinability than medium-to-high carbon grades. It can be deposited using PTA, TIG, and oxy-acetylene welding methods. Preheating to 300-450°C and slow cooling after welding are recommended to reduce the risk of hot cracking. Limited machining can be performed in annealed condition, with final finishing recommended using grinding or electrical discharge machining (EDM).
Technical Specifications
Chemical Composition
|
Element |
Standard Requirements |
Notes |
|
Co |
Remaining quantity |
Matrix elements that provide high-temperature strength, thermal stability, toughness, and inherent corrosion resistance |
|
Cr |
28.0 - 32.0% |
Form a dense Cr₂O₃ protective film, providing oxidation and corrosion resistance, and is also a main component of hard carbides |
|
W |
7.0 - 9.0% |
Provide solid solution strengthening, form hard and wear-resistant carbides with carbon, and enhance high-temperature hardness |
|
C |
0.8 - 1.2% |
Forming appropriate carbides with chromium and tungsten to provide wear resistance while maintaining good toughness |
|
Fe |
≤ 3.0% |
Strict control to ensure purity and microstructural stability |
|
Ni |
≤ 3.0% |
Strictly control to prevent excessive nickel from causing embrittlement |
|
Si |
≤ 2.0% |
Deoxidizer |
|
Mn |
≤ 1.0% |
Deoxidizer, improve processing performance |
|
Mo |
≤ 1.0% |
Optional small additions to provide enhanced solid solution strengthening and pitting corrosion resistance |
Physical Properties
|
Property |
Value/Range |
Test Conditions |
|
Density |
8.69 - 8.87 g/cm³ |
Room temperature (20°C) |
|
Melting Point |
1280 - 1390°C |
- |
|
Coefficient of Thermal Expansion (20-100°C) |
11.5 - 12.5 × 10⁻⁶ /K |
- |
|
Elastic modulus (Young's modulus) |
205 - 230 GPa |
Room Temperature |
|
Thermal conductivity (20°C) |
14.5 - 14.8 W/(m·K) |
- |
|
Resistivity (20°C) |
0.85 - 0.94 μΩ·m |
- |
|
Magnetism |
Non-magnetic (weakly magnetic) |
Cobalt-based alloys are typically non-magnetic or weakly magnetic at room temperature |
Mechanical Properties (Cast/Welded Condition, Typical Values)
|
Property |
Typical Value |
Specification |
|
Hardness (Cast/Weld Overlay Condition) |
38 - 46 HRC(350 - 450 HV) |
AWS A5.21 ECoCr-A |
|
Tensile Strength |
700 - 850 MPa |
- |
|
Yield Strength (0.2% Offset) |
550 - 700 MPa |
- |
|
Elongation |
1 - 3% (brittle material) |
- |
|
Compressive strength at room temperature |
2000 - 2300 MPa |
- |
|
Impact toughness |
Charpy V-notch 10 - 20 J |
- |
High-temperature performance
High-Temperature Hardness (Core Advantage): Stellite 19 maintains good hardness at high temperatures. Below are typical reference values for how hardness changes with temperature:
|
Temperature |
Typical hardness |
|
Room Temperature |
38 - 46 HRC |
|
400°C(750°F) |
34 HRC |
|
600°C(1110°F) |
30 HRC |
|
760°C(1400°F) |
23 HRC |
|
870°C(1600°F) |
18 HRC |
Antioxidant Performance:
In high-temperature oxidation environments, Stellite 19 forms a dense Cr₂O₃ oxide film on its surface. After exposure to air at 800°C for 1000 hours, the oxidation weight gain is less than 1 mg/cm², demonstrating better antioxidant properties than most iron-based heat-resistant steels.
Long-Term Thermal Stability:
When in service at temperatures above 600°C for extended periods, the alloy exhibits excellent microstructural stability with no significant phase transformation or softening. The allotropic transformation of the cobalt matrix and solid-solution strengthening from tungsten collectively ensure its long service life under high-temperature conditions.
Applicable Media:
1. Seawater, saltwater (excellent pitting corrosion resistance)
2. Oxidizing acids: Nitric acid (superior corrosion resistance at room temperature)
3. Non-oxidizing acids: Sulfuric acid (concentration ≤50%), hydrochloric acid (concentration ≤30%) (corrosion rate typically <0.1 mm/a)
4. Alkaline solutions: Sodium hydroxide, potassium hydroxide (resistant to all concentrations)
5. Organic acids: Acetic acid, formic acid, etc.
6. High-temperature oxidizing atmospheres, sulfur/chlorine-containing gases (forms a protective Cr₂O₃ film on the surface)
Note: Stellite 19 has limited corrosion resistance in strongly reducing acids (e.g., concentrated hot hydrochloric acid) and fluorine-containing media. For high-stress friction conditions, it is recommended to use in conjunction with lubricating media.
Stellite 19 is suitable for medium to high wear, moderate impact, and thermal cycling conditions, and is recommended for the following fields:
Application Fields
-
Valves and Sealing Industry: High and medium pressure valve sealing surfaces (seats, discs, stems), pump casings, rotating seals, and mechanical seals. It offers better wear resistance than Stellite 6, making it suitable for media containing solid particles and thermal cycling conditions.
-
Aerospace and Energy: Gas turbine guide vanes, engine valve sealing surfaces, turbocharger seals, and high-temperature bearings, which require good thermal fatigue resistance.
-
Oil and Gas: Wear parts of downhole tools, drill pipe joints, valve internals, and mud pump components, to withstand high-speed erosion by sand-containing media.
-
Industrial Machinery and Tools: Hot extrusion dies, hot shear blades, die-casting molds (gates, plungers), extruder screws, and cutting edges for plastic processing.
-
Chemical and Petrochemical: Reactor agitator blades, wear-resistant linings for heat exchanger tube plates, and pump/valve sealing surfaces, which endure the combined effects of corrosion and wear.
-
Nuclear Power Industry: Nuclear island valve seals and nuclear-grade wear-resistant liners, utilizing its high radiation tolerance and microstructural stability.
-
Shipbuilding and Offshore Engineering: Wear-resistant surfaces of propeller shafts and pump/valve components, to resist seawater corrosion and mechanical wear.
-
Automotive and Internal Combustion Engines: High-performance engine exhaust valves, rocker arms, and turbocharger seals, maintaining wear and seizure resistance at high temperatures.
-
Steel and Heat Treatment: Hot shear blades, hot saw blades, furnace bottom rolls, and guide rolls, which withstand high-temperature oxidation and abrasive wear.
-
Glass and Ceramic Forming: Glass molds and hot extrusion dies, due to their excellent corrosion resistance to molten glass and ceramics.
Delivery and Customization
We offer flexible and reliable supply chain solutions to ensure you receive Stellite 19 materials that perfectly match your project requirements.
|
Form |
 Sheet/Plate
|
 Bar/Rod
|
 Seamless Pipe
|
 Strip/Sheet Coil
|
 Wire/Wire Rod
|
|---|---|---|---|---|---|
|
Conventional Range |
Thickness: 0.5 - 100 mm |
Diameter Φ6-500mm |
Outer diameter Φ10-300mm |
Thickness: 0.1 – 3.0 mm |
Diameter Φ0.5-10mm |
|
Customization Capability |
Special thick/thin rolling, ultra-wide plates; special surface treatment, fixed-length cutting |
Large-sized forged bars (up to Φ800 mm), special-shaped bars, and various heat treatment conditions |
Large-diameter thick-walled pipes, special alloy composition; Pipe end processing (beveling, fixed length) |
Different hardness conditions, special heat treatments (stabilization treatment, grain size control), acid-washed surfaces, electrolytic polishing, coatings, or special protective films |
Special surface treatment, precision drawing |
Why Choose Us? - Reliable Engineering Technology. Dependable Delivery.
We are not just a supplier, but a trusted materials partner for you in China.
Vertically Integrated Production
Own 20,000㎡ facility with 10+ automated lines (8,000+ tons/year). In-house tooling & die center enables rapid customization and effective cost control - no middleman markup.
Strict Quality Control at Every Stage
Full traceability across key QC checkpoints throughout production. 100% compliant with ASTM/ASME, EN, and GB standards. Material test reports available with every shipment.
Reliable Delivery & Export Packaging
10+ years exporting to Europe, North America, Southeast Asia & Middle East with waterproof and anti-rust protection, combined with flexible shipping options ensures safe and on-time arrival.
Sample Validation Before Mass Production
We provide free samples for quality verification, allowing you to place bulk orders only after approval. We ensure consistency from sample to mass production by accurate dimensional measurement and transparent manufacturing.
FAQ
Q: What are the main advantages of Stellite 19?
Q: What heat treatment is required for Stellite 19?
Q: What is the maximum service temperature?
Q: What is the difference between Stellite 19 and Stellite 6?
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