Details about ASTM B574 UNS N06022

ASTM B574 UNS N06022 is a steel with excellent properties, often referred to as Hastelloy C22.The following is a detailed description of it

ASTM B574 UNS N06022 is a steel with excellent properties, often referred to as Hastelloy C22.The following is a detailed description of it:

Chemical composition:
Nickel: balance
Chromium: 20.0-22.5 percent
Molybdenum: 12.5-14.5 percent
Iron: 2.0-6.0%
Tungsten:2.5-3.5%
Cobalt: ≤2.5%
Carbon: ≤0.015%
Silicon: ≤0.08%
Manganese: ≤0.50%
Sulfur: ≤0.02%
Phosphorus: ≤0.02%

Performance Characteristics:
Excellent corrosion resistance: it has good resistance to all kinds of strong acid, strong alkali, brine, chloride and other corrosive mediums, and it is especially good in chloride-containing environment. It is resistant to wet chlorine gas, hypochlorite and many other corrosive chemicals.
Excellent resistance to pitting, crevice corrosion and stress corrosion cracking.
Good oxidation resistance: excellent oxidation resistance in oxidizing atmospheres, especially at high temperatures.
Higher high-temperature strength, can work stably for a long time under high-temperature environment.

Physical Properties:
Density: about 8.9g/cm³.
Melting temperature range: 1325-1370℃.

Product form and specification:
Including rods, seamless tubes, plates, strips, forgings and so on. For example, bar sizes are typically 5/16 to 3/4 inches (7.94 to 19.05 mm) in diameter, or 3/4 to 31/2 inches (19.05 to 88.9 mm) in diameter, and so on.

Application Areas:
Due to its excellent performance, ASTM B574 UNS N06022 is widely used in many industrial fields. It is commonly used in chemical, petrochemical, marine engineering, pharmaceutical, paper making, electric power, marine, environmental protection and other industries. Specifically, it can be used to manufacture reactors, pipelines, heat exchangers, parts of offshore platforms, components of ships, pharmaceutical equipment, key components of flue gas desulphurization plants and so on.

Machining and welding:
It has good processing performance and is suitable for a variety of processing methods, such as forging and rolling. At the same time, it also has good welding performance, can be connected with suitable welding process and welding materials.

When using ASTM B574 UNS N06022, it is necessary to select the appropriate product form and specifications according to the specific working conditions and design requirements, and follow the relevant processing, welding and use of specifications to ensure its performance and safety. Meanwhile, in some specific applications, further surface treatment or protective measures may be required to enhance its corrosion resistance and service life.

stainless steel processing

The manufacture of stainless steel involves a series of processes. First, the steel is melted, and then it is cast into solid form. After various forming steps, the steel is heat treated and then cleaned and polished to give it the desired finish. Next, it is packaged and sent to manufacturers, who weld and join the steel to produce the desired shapes.

The raw materials that constitute a stainless steel item are placed together and melted in a giant electric furnace. Intense heat is applied rigorously for a period of 8 to 12 hours during this step. Once the melting is complete, the molten steel is cast into desired semi-finished forms. Some of the most common forms or shapes include slabs, blooms (rectangular shapes), billets (these could either be round or square), rods, and tube rounds.

In the second stage, the semi-finished steel shapes undergo a series of forming operations. For instance, the stainless steel is hot rolled (heated and passed through enormous rolls). The blooms and billets mentioned above are converted to bar and wire. The slabs on the other hand are formed into plates, strips or sheets. It is very common to turn semi-finished steel shapes into bars, as it is the most versatile stainless steel form (it comes in all grades and sizes). You have round, square, octagonal, and hexagonal bars, each suitable for a different type of application.

The various stainless steel forms undergo a thorough annealing process during this step. Annealing is another name for heat treatment where the stainless steel is heated and cooled in a controlled environment. The purpose of this heat treatment is to relieve the pent-up stress inside the stainless steel and soften the material to make it more suitable for a wide variety of applications. The people in charge of carrying out the annealing process have to be very careful about the conditions as even the slightest of changes in the temperature, pressure, duration, or cooling rate could result in a faulty product.

During the annealing process, a certain amount of scale appears on the surface of the stainless steel. This scale can be removed using a number of different processes that are collectively known as descaling. Pickling is one of the more common methods of carrying out the descaling process.

The semi-finished, heat-treated, and descaled stainless steel forms are cut into specific shapes in this step. Mechanical cutting is performed with the aid of guillotine knives, blanking, nibbling, and high-speed blades.

Finishing is applied to help the stainless steel product achieve its signature aesthetically appealing appearance. Finishes are also needed to make the stainless steel product smooth and easier to clean, which is a top requirement in sanitary applications.