Know About Different Types of Stainless Steel Used in Piping

Know About Different Types of Stainless Steel Used in Piping

May 30, 2020, 11:25:37 PM Life and Styles

Today, stainless steel is very popular among the steel industry, due to its great variety. Just after carbon steel, stainless steel is known as a widely used material in process industries, due to its amazing corrosion resistance property. Contractors and architects are using it often in building and construction. Stainless steel is an alloy steel containing a minimum carbon content of less than 1.20% and minimum chromium content of 10.5% or more. It has great ductility and excellent resistance to corrosion. The grades and size of stainless steel may be different, based on the application and they may come in the form of tubes, bars, wires, sheets, plates, and many more. It can be further categorized into different types, based on the mechanical properties and crystalline structure of stainless steel 

Let’s have a look at the different types if the stainless steel: 

Austenitic stainless steel

This type of steel is non-hardenable by heat treating. It is much higher in chromium content than its stainless steel counterparts. Austenitic has a microstructure that includes a mixture of nickel, manganese, and nitrogen. Its structure is just the same as regular steel. But only in a high temperature giving it weldability and formability. Austenitic stainless steel is used for cookware, automotive trim, processing equipment, food and beverage equipment, and also a variety of industrial applications. It is also popular for its non-magnetic properties. 

Ferritic stainless steel

It is magnetic and contains high carbon, therefore it is relatively poorer corrosion resistance than austenitic stainless steel. They can be further strengthened by cold working, while this type of steel is strong, tough, and magnetic. It can’t be hardened with heat treatment. Workers use this ferritic stainless steel for a wide range of applications that do not require welding. It contains up to 0.1% carbon, about 12-17% chromium, trace amounts of nickel and other alloys in small quantities such as molybdenum, aluminum, and titanium. 

Martensitic stainless steel

It is based on chromium with higher carbon levels. It can harden and temper much like low-alloys and carbon steels. It comprises 11-17% chromium, contains less than 0.4% nickel, and approximately 1.2 % carbon. It encompasses magnetic properties and is also responsive to heat treatments. The martensitic stainless steel used to make surgical and dental instruments, blades, knives, and other cutting tools. 

Precipitation Hardened stainless steel

It is heat treatable to high strength and magnetic steel. With good corrosion resistance, it has a very high strength to weight ratio. It is one of the most popular stainless steel that is widely used, such as precipitation hardened stainless steel 17-4PH. It has low weldability and formability. It is used in long products that need sheet and plate form. 

Duplex / Super Duplex stainless steel

Simply, it is a combination of austenitic and ferritic steels, resulting that’s much stronger than both individually. It has great resistance to crevice and pitting corrosion. It also has high resistance and strength to stress corrosion cracking. These types of steels are used in heat exchangers, seawater systems, and structural applications.

Published by Zoe Sewell


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