Stellite 6 alloy sleeves spacer customized for customers in the oil and gas industry-ZZCT Experts in powder metallurgy

Stellite 6 alloy is a cobalt-based alloy whose main components are cobalt, chromium, molybdenum and carbon. It has high hardness, strong wear resistance, good corrosion resistance, excellent high temperature resistance, and has good overall performance.

application

Stellite 6 alloy can be used to manufacture a variety of wear-resistant, corrosion-resistant, high-temperature, and high-pressure parts, such as:

Gas turbine blades and guide vanes in aerospace and turbojet engines;

Oil well pumps and pumping unit components in oil and gas extraction;

Valves, pump bodies, bushings, nozzles and acid-resistant equipment in the chemical and metallurgical industries;

Artificial heart valves in medical equipment, etc.

Preparation

Stellite 6 alloy preparation methods include a variety of methods, such as:

Powder metallurgy method: Mix metal powders such as cobalt, chromium, molybdenum and a certain amount of carbon powder evenly, then press and shape them, and sinter them at high temperatures to obtain the alloy;

Melting metallurgy: Heating and melting metals such as cobalt, chromium, and molybdenum, and then adding appropriate amounts of carbon and other elements to prepare alloys;

Arc melting method: Cobalt, chromium, molybdenum and other metal strips are heated and melted by arc, and then cooled to obtain alloys.

Stellite 6 alloy is a cobalt-based alloy with the following physical and chemical properties:

Density and hardness: The density of Stellite 6 alloy is approximately 8.55 g/cm³, and the hardness can reach HRC 40-50.

Melting Point: The melting point of Stellite 6 alloy is approximately 1,310-1,390°C.

Thermal expansion coefficient: The thermal expansion coefficient of Stellite 6 alloy is about 13.8×10^-6/K, which is similar to steel.

Magnetism: Stellite 6 alloy is a non-magnetic material.

Corrosion resistance: Stellite 6 alloy has excellent corrosion resistance in general chemical media, such as strong acids such as hydrochloric acid and nitric acid.

Oxidation resistance: Stellite 6 alloy has good oxidation resistance in high-temperature oxidizing environments.

Machinability: Stellite 6 alloy has good machinability and weldability.

Stellite 6 alloy has good machinability and weldability, but the following points need to be noted during the welding process:

Treatment before welding: Before welding, Stellite 6 alloy needs to be fully pre-treated, such as cleaning the surface, removing the oxide layer, adjusting the alloy composition, etc. At the same time, strict selection and preparation of welding materials and welding equipment are also required.

Welding methods: Commonly used Stellite 6 alloy welding methods include argon arc welding, plasma welding, laser welding, etc. Factors such as welding position, shape, thickness, etc. need to be considered when selecting a welding method.

Welding parameters: The selection of welding parameters will have an important impact on the quality of the weld, such as welding current, welding speed, welding gas, etc.

Post-welding treatment: After welding is completed, subsequent heat treatment and surface treatment, such as annealing, tempering, sandblasting, polishing, etc., are required to improve welding quality and ensure final performance.

In short, Stellite 6 alloy has good weldability, but the above points need to be paid attention to during the welding process to ensure welding quality and final use performance. At the same time, because Stellite 6 alloy is prone to hydrogen embrittlement during welding, it is necessary to avoid absorbing hydrogen and perform appropriate heat treatment after welding.