Duplex Stainless Steel
The microstructure of duplex stainless steel is two-phase, with ferritic and austenitic stainless steel grains. Half of the ferritic grains transform to austenitic grains because they can cool to room temperature. When duplex steel begins to melt, it transitions from a liquid to a ferritic condition. Duplex stainless steel has a microstructure that is around 50 percent austenite and 50 percent ferrite.
316 Stainless steelnennnn
This stainless steel grade belongs to the austenitic group of stainless steel. The molybdenum concentration of stainless steel 316 tubes is between 2% and 3%. Molybdenum is the element that provides metals with their strength, resistance to corrosion, and the ability to withstand high temperatures. It also gives you more strength at higher temperatures.
Duplex Steel V/s 316 Stainless Steel-
Duplex alloys are more resistant to chloride stress corrosion cracking than 316 stainless steel. Duplex steel is more resistant to corrosion than austenitic or 316 stainless steel. It is also formable under pressure and has a high hardness. Because duplex stainless steel tubes have a lower molybdenum and nickel content, it is less expensive. Another distinction between duplex and 316-stainless steel is that duplex includes 18-28 percent chromium and 4.5-8 percent nickel, whereas 316-stainless steel contains 18 percent chromium and 8% nickel. Any steel that is stainless is referred to as stainless steel.
A minimum of 10% chromium content is required for a material to be classified as stainless. There are two types of stainless steel: ferritic and austenitic. These are available in the 400 and 300 series, respectively. Magnetic ferritic steels are magnetic, but non-magnetic austenitic steels are not. They have various microstructures in terms of metallurgy. The metallurgic microstructure of duplex steels contains both ferritic and austenitic phases, combining the advantages of both ferritic and austenitic steel grades.