Hastelloy tube

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Hastelloy seamless tube suppliers in UAE

What is Hastelloy bright annealed tubing?

Annealing on Hastelloy intends to make the material softer and more fabricable. Here, the tubing gets annealed in a medium that avoids discolouration, hence the name. Generally, a Hastelloy metal bright annealed tube gets performed in a vacuum or an atmosphere with inert gases. It keeps surface oxidation low and contributes to a vivid surface finish with only a thin oxide layer.
While the finished material is bright and reflective, it may have some cloudiness and imperfections. It is superior to solution annealing, yielding a finer grain size and a better surface finish. The tensile strength and hardness are also better in this tube.

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Does annealing increase the resistance of Hastelloy tubing?

Hastelloy tubes can undergo annealing to soften the material and make it more fabricable for various applications. Annealing can also improve its chemical properties and resistance. Hastelloy gets heated to a critical temperature to encourage recrystallization. It then gets slowly cooled to room temperature. You can order a Hastelloy alloy redrawn, extruded & annealed tube from manufacturers based on your desired requirements.
The standard annealing temperature for Hastelloy is 1170°C to 1200°C. It gets held for around 10 hours. This process makes the superalloy refined by altering its grain structure. The procedure also eliminates dendritic segregation. Since this alloy contains tungsten, annealing can improve tensile strength effectively.

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Does a Hastelloy seamless tube have good creep property?

The creep property of a material refers to its deformation under stress below the yield strength. It also gets referred to as cold flow. Continuous mechanical stresses can deform a material over time. It is time-dependent and varies across materials.
A Hastelloy seamless tube displays excellent creep properties at high temperatures. It provides strength and hardness that help it resist deformation with prolonged exposure to stressors.
Hastelloy is also known for its excellent resistance to corrosion and oxidation. The superalloy can handle chemical attacks, stress-related cracking and localized corrosion. Materials with good creep properties can get employed in high-risk sectors with stressful operating conditions, like nuclear power and chemical processing.
You can employ a Hastelloy metal alloy heat exchanger & boiler tube in severe environments without risking deformation. It is also tolerant toward pitting and crevice corrosion.

Basic types of Hastelloy tube

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Is a Hastelloy cold drawn tube suitable for thermal or nuclear reactors?

Yes, Hastelloy frequently gets employed in thermal and nuclear reactors because of its tolerance to high temperatures and resistance to harsh chemicals. A Hastelloy cold drawn tube has superior mechanical and thermal properties like strength and hardness. Piping in these sectors must be sturdy and exhibit top-notch mechanical and chemical properties.
Hastelloy can withstand cryogenic and high temperatures as its thermal expansion is low.
A key advantage is resistance against grain boundary precipitates. The nickel component makes it suitable for utilization in heated applications. Plus, you will not notice deformation under fluctuating conditions.

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What is the difference between eddy current and ultrasonic testing of Hastelloy condenser tubes?

Eddy current test is a common mechanism to ascertain the quality of the Hastelloy tube. It uses electromagnetic induction to detect any flaws in Hastelloy metal condenser tubes. It involves passing as an alternating current through a conductor. In the proximity of another conductor, an eddy current will get induced. This current gets impacted if the tube has any surface defect or a change in thickness. It works best for inspecting thin welds and surface flaws.
In contrast, ultrasonic testing uses a high-frequency sound wave. This wave gets reflected from the interior surface to let you assess the wall thickness. It is a better test for detecting corrosion, wall thickness, and volumetric deviations. It can also work for thick welding.

Which certificate should you ask for from Hastelloy tubing suppliers?

The most vital certificate is a Mill Test Certificate or MTC. A manufacturer issues this to guarantee that the Hastelloy coiled tubing has the chemical and mechanical properties per the desired compliance. It includes all the necessary details, like the dimensions of the product, the heat numbers, and the material grade. It also shows the result of tests performed, i.e., hydrostatic, ultrasounds, metal graphics, etc. Generally, these certificates conform to EN 10204.
Another vital document is the inspection certificate 3.1. Hastelloy tubing suppliers issue this to confirm the test results after inspecting the products. The tests get determined by the regulations and specifications based on the component and may include chemical composition analysis. It gets verified by the authorized representative.