Advantages and Features of Alloy 20 Pipes

What are the Alloy 20 Pipes?

Austenitic nickel-iron-chromium alloy 20 is also known as Carpenter® 20. It is common to practice producing gasoline, solvents, explosives, chemicals, medicines, food, and synthetic materials using a super alloy that also contains copper and molybdenum. high level of resistance to stress-corrosion cracking. Cold formable, machinable, and weldable. The ideal alloy for usage with sulfuric acid.

Austenitic alloy 20 has high corrosion resistance in settings including sulfuric acid and other hostile fluids. Niobium is used to stabilize this alloy in order to prevent intergranular corrosion. When carefully compared to higher nickel-based alloys, Alloy 20 Pipes may offer possible cost savings while outperforming regular stainless steels. It provides consumers with a wide range of advantages, such as:

1) Outstanding resistance to pitting, crevice corrosion, and corrosion

2) Ideal for usage with phosphoric, nitric, and sulfuric acids

3) Simple manufacturing and superior mechanical qualities

Applications of Alloy 20 Pipes

Chemical processing, petrochemical and refining, maritime, pharmaceutical, and food processing are just a few of the sectors that employ Alloy 20 Pipes. Storage tanks, mixing tanks, agitators, pump and valve components, food processing machinery, fasteners, and fittings are examples of end-use applications. According to ASME, applications are restricted to a maximum temperature of 1000°F. It is also vital to establish if the desired corrosion resistance can be obtained within the given environment.

Some Features of Alloy 20 Pipes

  • Protection against Corrosion

Alloy 20 Pipes have very strong resistance to sulfuric acid. Additionally, this alloy has adequate resistance to nitric acid, phosphoric acid, and aqueous salt solutions. Due to its resistance to pitting and crevice corrosion, alloy 20 is a fantastic choice when chloride stress corrosion cracking is a concern. Environments with chloride ions should be avoided since they can cause large increases in corrosion.

  • Heat treatment

It is possible to cold-work or hot-work Alloy 20 Pipes using conventional techniques. Prior to forging, hot forged material should be heated to a temperature between 2100°F and 2250°F with rigorous temperature management to ensure that the material does not drop below 1800°F. After hot working, anneal the material by raising its temperature to between 1725°F and 1850°F for at least 30 minutes per inch of thickness, and then quench it in water.

  • Mechanical qualities

When stress relief is sought, heat to a temperature below 1000°F and then quenched with water once the appropriate time has passed at the temperature. Alloy 20 Pipes should be maintained at a temperature of 1725°F to 1850°F for 30 minutes per inch of thickness. By heating to 2100°F, a reduced hardness can be achieved, although this may not be good for the alloy’s ability to stabilize e. When welding to higher-grade alloys like C276 and Alloy 22, AWS ERNiCrMo-3 may be used for TIG and MIG, whereas ENiCrMo-3 for SAW can be used for welding to dissimilar alloys like 316.