Cobalt Alloy 6B Bar
Overview
Cobalt Alloy 6B Bar is a cobalt-based chromium-tungsten wear-resistant alloy bar containing approximately 60% cobalt, 30% chromium, and 4.5% tungsten. Produced via casting or powder metallurgy, it exhibits exceptional high-temperature wear resistance, corrosion resistance, and creep resistance. It is commonly employed in the manufacture of wear-resistant components for extreme operating conditions, such as valves, pump shafts, and bearings. Alloy 6B represents a highly representative grade within cobalt-based high-temperature alloys. Commonly referenced international standards include ASTM B262 (for forgings) and ASTM B574 (for bars), ensuring consistent composition and performance stability.
Cobalt Alloy Characteristics
Excellent corrosion resistance
The chromium element in cobalt alloys forms a dense protective layer of chromium oxide (Cr₂O₃) on the surface, exhibiting superior resistance to high-temperature oxidation and thermal corrosion compared to nickel-based alloys.
Outstanding high-temperature performance
It maintains stable microstructural integrity under prolonged exposure to high temperatures (above 600°C), retaining excellent mechanical strength and creep resistance that significantly outperforms many iron-based and nickel-based alloys.
Excellent wear resistance
It possesses exceptional hardness and resistance to abrasive wear and adhesive wear. Under high temperatures and pressures, it is less prone to metal-to-metal adhesion (seizing), making it suitable for manufacturing friction pair components such as valve seats, sealing rings, and bearings.
Excellent biocompatibility
Medical-grade cobalt alloys are non-toxic and non-allergenic to human tissue, exhibiting excellent biocompatibility. They demonstrate exceptional stability when subjected to long-term cyclic loading within the body's fluid environment, resisting corrosion and releasing no harmful ions.
Dimension
|
Grade |
Co 6B |
| Processing Technology | Forging, Rolling, Casting, Sintering |
|
Size |
Φ8-150mm |
|
Length |
≤3000mm |
| Density | 8.6g/cm³ |
|
Hardness |
40-52 HRC |
|
Shape |
Round |
|
Delivery Time |
15-25 days |
|
Standard |
AMS, DIN, ASTM, GB |
|
Certification |
ISO 9001 |
Application
1. Aerospace Sector
Cobalt Alloy 6B bar is frequently employed in the manufacture of high-temperature bearings, aero-engine turbine blades, combustion chamber components, erosion-resistant seals for rocket engines, and fuel nozzles – all parts subjected to prolonged high stress and friction. This ensures structural reliability under extreme conditions. For instance, corrosion-resistant shrouds in steam turbines utilise Cobalt 6B to shield blades from high-temperature steam erosion.
2. Oil and Gas Extraction
It is employed in deep-sea drilling tools such as drill bits, valve stems, and sucker rod pumps, as well as valves and pipelines for offshore drilling platforms. Its service life can exceed that of conventional alloy valves by more than threefold.
3. Chemical Processing Industry
Cobalt 6B's resistance to strong acids like sulphuric and nitric acid, along with salt spray environments, makes it the material of choice for chemical reactor linings, piping, and pump plungers. For instance, in the chlor-alkali industry, centrifuge linings made from Cobalt 6B withstand prolonged corrosion from caustic soda solutions.
4. Moulds and Precision Manufacturing
Suitable for producing hot extrusion dies, die-casting cores, gear cutting tools, crusher rollers, and other machining tools, significantly reducing product defects caused by wear and enhancing production efficiency.
5. High-Temperature Furnace Industry
Primarily used for manufacturing furnace rolls and high-temperature fixtures in heat treatment furnaces, maintaining stable machining performance under prolonged high-temperature oxidation.
6. Food Processing Industry
Suitable for cutting blades, mixing shafts, centrifuge linings, and sterile piping in food processing machinery, ensuring safety throughout production processes.
7. Medical Industry
Employed in manufacturing implantable medical devices such as artificial joints, dental implants, and cardiac stents. Forms stable bonds with human tissue, minimising rejection reactions.
Types of Cobalt Alloys
|
Core components |
Key performance |
Typical applications |
|
| Co-Base Superalloy |
Cobalt-based, containing chromium, tungsten, molybdenum, and other elements, with some containing carbon to form hard carbides. |
Maintains high strength, creep resistance, and resistance to high-temperature oxidation and corrosion at temperatures ranging from 600 to 1200°C. |
Turbine blades for aero-engines, high-temperature furnace rolls (e.g., Stellite 6, Stellite 21) |
| Co-Cr Alloy |
Cobalt-based, containing 20–30% chromium, often with additions of molybdenum, tungsten, and other elements. |
Exceptional corrosion resistance (particularly against seawater and strong acids), high hardness, and excellent biocompatibility |
Medical implants, marine engineering components (valves, pump bodies), chemical plant linings |
| Co-Ni Alloy |
Cobalt and nickel form a dual matrix (with nickel content reaching 30–50%), often combined with elements such as iron and molybdenum. |
Outstanding low-temperature toughness (retaining plasticity at ultra-low temperatures down to -270°C), high strength, fatigue resistance |
Aerospace cryogenic components (liquefied natural gas pipelines), deep-sea probe structural components |
| Co-W Alloy |
Tungsten serves as the primary strengthening element (W content 10%-40%), with some carbon forming carbides. |
Exceptionally high hardness (HRC 50-65), wear resistance, and resistance to high-temperature erosion |
Precision cutting tools, mould cutting edges, petroleum drilling bits, engine valve seats |
| Medical Co-Alloy |
Primarily cobalt-chromium-molybdenum alloys (Co-Cr-Mo), with strict control of harmful impurities (such as lead and mercury). |
Non-toxic, no rejection reaction, resistant to bodily fluid corrosion, and excellent biocompatibility with bone tissue. |
Artificial hip joints, artificial knee joints, cardiac stents, and dental implant abutments |
Cobalt Chrome Alloy Process
① Employing vacuum induction melting technology, the precise ratio of elements such as cobalt, chromium, tungsten, and nickel is controlled to produce high-purity ingots.
② The ingots are heated to high temperatures for hot forging, forming dense bar blanks.
③ Through multiple passes of hot extrusion or hot rolling, the material's grain structure and mechanical properties are further refined, progressively shaping it into bar stock approaching final dimensions.
④ The bar stock is heated to a specific high temperature, held at this temperature, then rapidly cooled. This ensures complete solid solution of alloying elements, yielding a uniform austenitic microstructure and optimising overall performance.
⑤ Cold drawing or cold rolling is performed as required to enhance dimensional accuracy and surface finish, followed by straightening, cutting, and surface treatment (e.g., pickling, polishing).
⑥ Upon completion, the finished product undergoes chemical composition analysis, mechanical property testing, non-destructive inspection (e.g., ultrasonic testing), and dimensional verification. Upon passing inspection, it is packaged for international express delivery.
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After receiving the customer's inquiry, we will respond immediately to confirm the customer's needs, such as size specifications and order quantity, and then carry out a series of services such as quotation, customized production, quality inspection, packaging and delivery, after-sales, etc. It is our responsibility to let customers have no worries.
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Upon receiving customer inquiries, we promptly and accurately ascertain the product they require, ensuring there are no issues related to time differences.Our customer service team operates around the clock, ensuring that no matter where our customers are located, they receive the same level of attention and service.
Highly customisable
We can customize production to match the customer's drawings, and we are also capable of designing and processing in accordance with the customer's requirements. Furthermore, our team ensures that every customized product meets or exceeds industry standards, maintaining the highest levels of functionality and reliability.
Global Shipping
We have established long-term cooperation with many international logistics companies, such as DHL, UPS, FedEx, and SF Express, and can deliver products to customers on time by land or air transportation. We can effectively avoid trade barriers, shorten the delivery cycle, ensure the safety and on-time arrival of goods, and significantly reduce operating costs and improve customer satisfaction.
Case
Cobalt Alloy 6B Bar, Cobalt 6B Rod, To Japan
Recently, FANMETAL successfully completed a trade cooperation with a senior steel company in Japan. The Cobalt 6B Rod delivered this time demonstrates our company's outstanding capabilities in the field of high-end non-ferrous metal material supply, and is conducive to our consolidation of the Asian market. After receiving the customer's inquiry, we quickly assigned a professional team to communicate and exchange with the customer in detail, effectively meet the customer's ordering needs, respond to issues such as price, freight, and delivery time, and ship the products in time after production. The Japanese customer was very satisfied with this cooperation and said that if there is a chance, he will visit our factory in China.
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