Oil and Gas Grade Stellite6/12/20/21 Impeller Blades High Temperature & Corrosion Resistant
Cobalt alloy blades are high-performance components with cobalt as the matrix, supplemented by elements like chromium, tungsten, and molybdenum. Their core advantages include high-temperature resistance, wear resistance, and corrosion resistance, making them widely used in extreme operating conditions. Below is key information about them:
1. Core Materials & Performance
- Typical Materials: Primarily include Stellite series, DZ640M directionally solidified cobalt alloy, L605 (HAYNES 25), etc.
- Performance Advantages:
-
- High-Temperature Resistance: Can operate stably for long periods at 730–1100°C (some grades like DZ640M can reach 1040°C), with a high initial melting temperature and stable microstructure.
- Wear Resistance: The matrix hardness is about HRC 48, while embedded hard phases (e.g., chromium carbide, molybdenum carbide) have a hardness exceeding HRC 70—its wear resistance is over 4 times that of ordinary steel.
- Corrosion Resistance: Resists corrosion from high-temperature gas, acid-base media, salt spray, etc., especially in sulfur-containing oxidizing atmospheres.
- Thermal Shock Resistance: Can withstand rapid thermal cycles (e.g., 1000°C to water cooling) without cracking.
2. Application Scenarios
- Aerospace: Turbine guide vanes and nozzle guide vanes in aero-engines and gas turbines, adapting to high-speed, high-temperature, and high-pressure power environments.
- Energy Industry: Blades for industrial gas turbines and steam turbines; components for petrochemical equipment (e.g., residual oil gasifier nozzles) and high-temperature valves.
- High-End Manufacturing: Chemical fiber cutting tools, precision molds, metallurgical furnace accessories, etc., suitable for high-wear and high-corrosion production conditions.
3. Manufacturing Processes
Processes such as precision casting (e.g., directional solidification), powder metallurgy, and additive manufacturing (3D printing) are used. Some grades (e.g., Stellite 6K) undergo forging + rolling to refine grains and extend service life; complex blades may also feature internal cooling channels to meet high-temperature heat dissipation needs.
4. Characteristics of Typical Grades
| Grade | Maximum Operating Temperature | Core Advantages | Representative Applications |
| Stellite 6 | 850°C | Balanced wear/corrosion resistance | Engine valves, valve components |
| DZ640M | 1040°C | Directional solidification, notch-insensitive | Aero-engine turbine guide vanes |
| L605 | 1000°C | Oxidation/carburization resistance | Combustion chambers, turbine rings |
Real Photos of Stellite Alloy Impellers Blades:
Material Grade Table:
| Stellite 1 Alloy | |||||||||
| Nominal Composition (Mass %) and Physical Properties | |||||||||
| Co | Cr | W | C | Other | Hardness | Density | Melting Range | ||
| Bal. | 28.00-32.00 | 11.00-13.00 | 2.00-3.00 | Ni, Fe, Si, Mn, Mo | 50-58 HRC 550-720 HV |
8.69 g/cm3 0.314 lb/in3 |
1248-1290ºC 2278-2355ºF |
||
| Stellite 3 Alloy | |||||||||
| Nominal Composition (Mass %) and Physical Properties | |||||||||
| Co | Cr | W | C | Other | Hardness | Density | Melting Range | ||
| Bal. | 30.50 | 12.50 | 2.30 | Ni, Fe, Si | 48-63 HRC | 8.69 g/cm3 0.314 lb/in3 |
1250-1290°C 2280-2355°F |
||
| Stellite 4 Alloy | |||||||||
| Nominal Composition (Mass %) and Physical Properties | |||||||||
| Co | Cr | W | C | Other | Hardness | Density | Melting Range | ||
| Bal. | 30.00 | 14.00 | 1.00 | Ni, Fe, Si, Mn | 45-49 HRC | 8.61 g/cm³ 0.311 lb/in³ |
1340–1395ºC 2245–2545ºF |
||
| Stellite 6 Alloy | |||||||||
| Nominal Composition (Mass %) and Physical Properties | |||||||||
| Co | Cr | W | C | Other | Hardness | Density | Melting Range | ||
| Bal. | 27.00-32.00 | 3.00-6.00 | 0.90-1.40 | Ni, Fe, Si, Mn, Mo | 36-45 HRC 380-490 HV |
8.44 g/cm³ 0.305 lb/in³ |
1250-1360ºC 2282-2480ºF |
||
| Stellite 12 Alloy | |||||||||
| Nominal Composition (Mass %) and Physical Properties | |||||||||
| Co | Cr | W | C | Other | Hardness | Density | Melting Range | ||
| Bal. | 27.00-32.00 | 7.50-9.50 | 1.40-2.00 | Ni, Fe, Si, Mn | 45-51 HRC 435-590 HV |
8.53 g/cm³ 0.308 lb/in³ |
1225-1280ºC 2240-2335ºF |
||
| Stellite 13 Alloy | |||||||||
| Nominal Composition (Mass %) and Physical Properties | |||||||||
| Co | Cr | W | C | Ni | Other | Hardness | Density | Melting Range | |
| Bal. | 28.00 | 20.00 | 0.90 | 5.00 | V, Fe, Si, Mn | 45–50HRC | 9.02 g/cm³ 0.326 lb/in³ |
1230–1300ºC 2246-2372ºF |
|
| Stellite 19 Alloy | |||||||||
| Nominal Composition (Mass %) and Physical Properties | |||||||||
| Co | Cr | W | C | Si | Other | Hardness | Density | Melting Range | |
| Bal. | 31.00 | 10.50 | 1.90 | 1.00 | Ni, Fe | 51-53 HRC | 8.36 g/cm3 0.302 lb/in3 |
1239-1299°C 2263-2370°F |
|
| Stellite 20 Alloy | |||||||||
| Nominal Composition (Mass %) and Physical Properties | |||||||||
| Co | Cr | W | C | Si | Other | Hardness | Density | Melting Range | |
| Bal. | 32.50 | 17.50 | 2.50 | <2.00 | Mo, Fe, Si | 53-62 HRC | 8.77 g/cm3 0.317 lb/in3 |
1263-1301°C 2305-2374°F |
|
| Stellite 21 Alloy | |||||||||
| Nominal Composition (Mass %) and Physical Properties | |||||||||
| Co | Cr | Mo | C | Si | Other | Hardness | Density | Melting Range | |
| Bal. | 26.00-29.00 | 4.50-6.00 | <0.35 | <3.00 | Fe, Si, Mn | 27-40 HRC 290-430 HV |
8.33 g/cm³ 0.301 lb/in³ |
1295-1435ºC 2360-2615ºF |
|
| Stellite 25 Alloy | |||||||||
| Nominal Composition (Mass %) and Physical Properties | |||||||||
| Co | Cr | W | C | Other | Hardness | Density | Melting Range | ||
| Bal. | 20.00 | 15.00 | 0.10 | Ni, Fe, Si,Mo, Mn | 20-45 HRC | 8.31 g/cm3 0.300 lb/in3 |
1329-1410°C 2425-2573°F |
||
| Stellite 31 Alloy | |||||||||
| Nominal Composition (Mass %) and Physical Properties | |||||||||
| Co | Cr | W | C | Ni | Other | Hardness | Density | Melting Range | |
| Bal. | 26.00 | 7.50 | 0.50 | 10.50 | Mo, Fe, Si | 25-35 HRC | 8.61 g/cm3 0.311 lb/in3 |
1340-1395°C 2245-2545°F |
|
| Stellite 190 Alloy | |||||||||
| Nominal Composition (Mass %) and Physical Properties | |||||||||
| Co | Cr | W | C | Fe | Other | Hardness | Density | Melting Range | |
| Bal. | 27.00 | 14.00 | 3.30 | <3.00 | Ni, Si, Mo, Mn | 52-60 HRC 570-760 HV |
8.66 g/cm³ 0.313 lb/in³ |
1200-1335ºC 2192-2435ºF |
|
| Stellite 250 Alloy | |||||||||
| Nominal Composition (Mass %) and Physical Properties | |||||||||
| Co | Cr | Si | C | Fe | Other | Hardness | Density | Melting Range | |
| Bal. | 28.00 | 1.00 | 0.10 | 20.00 | Mn | 18-29 HRC | 8.05 g/cm3 0.291 lb/in3 |
1380-1395°C 2515-2540°F |
|
| Stellite 694 Alloy | |||||||||
| Nominal Composition (Mass %) and Physical Properties | |||||||||
| Co | Cr | W | C | Ni | Other | Hardness | Density | Melting Range | |
| Bal. | 28.50 | 19.50 | 0.90 | 5.00 | V, Fe, Si, Mn | 44-50HRC | 9.02 g/cm3 0.326 lb/in3 |
1237-1296°C 2259-2365°F |
|
| Stellite Star J Alloy | |||||||||
| Nominal Composition (Mass %) and Physical Properties | |||||||||
| Co | Cr | W | C | Ni | Fe | Other | Hardness | Density | Melting Range |
| Bal. | 32.50 | 17.50 | 2.50 | 2.00 | 2.00 | Mn, Si | 50-63 HRC | 8.76 g/cm3 0.316 lb/in3 |
1215-1299°C 2220-2370°F |
FAQ:
Q: How to give inquiry ?
A: Step 1, please give us some details about your furnace,operating temperature,cooling method,loading weight of your furnace and so on;
Step 2, it's better to provide 3D drawings;
Step 3, when we have enough details, we may design the products drawings and quote accordingly;
Q: When can I get the price?
A: We usually quote within 24 hours after we get your inquiry(Except weekend and holidays). If you are very urgent to get the price, please email us or contact us in other ways so that we can offer you a quote.
Q: When will make delivery ? /What is the delivery Time?
A: -Sample Order: 35 days after receipt of the full payment.
-Stock Order: 10 days after receipt of the full payment
-OEM Order: 30 days after receipt of the deposit.
Q: What's your after-sales service?
A: 1 year warranty for all kinds of products;
If you find any defective accessories first time, we will give you the new parts for free to replace in the next order, as an experienced manufacturer, you can rest assured of the quality and after-sales service.
Q: What's your payment condition?
A: T/T
Payment<=USD10000, 100% in advance. Payment>USD10000, 50% T/T in advance ,balance before shipment.
Q: What is the shipping method?
A: Transported by DHL, UPS, EMS, Fedex,Air freight, sea freight or train freight.
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.