Grade 316 is the standard molybdenum-bearing grade, second in importance to 304 amongst the austenitic stainless steels. Alloy 20 has excellent mechanical properties and the presence of niobium in the alloy minimizes the precipitation of carbides during welding.Īustenitic stainless steel can be tested by nondestructive testing using the dye penetrant inspection method but not the magnetic particle inspection method. This alloy exhibits superior resistance to stress-corrosion cracking in boiling 20–40% sulfuric acid. Other notable austenitic stainless steels are Type 309 and 310, which are utilized in high temperature applications greater than 800☌.Īlloy 20 (Carpenter 20) is an austenitic stainless steel possessing excellent resistance to hot sulfuric acid and many other aggressive environments which would readily attack type 316 stainless. The higher nitrogen addition in 200 series gives them higher mechanical strength than 300 series Some 300 series, such as Type SS 316, also contain some molybdenum to promote resistance to acids and increase resistance to localized attack (e.g. Type SS 316 is the next most common austenitic stainless steel. Type SS 304 is extensively used in such items as, cookware, cutlery, and kitchen equipment. The most common austenitic stainless steel and most common of all stainless steel is Type SS 304, also known as 18/8 or A2. 300 series stainless steels achieve their austenitic structure primarily by a nickel addition while 200 series stainless steels substitute manganese and nitrogen for nickel, though there is still a small nickel content.ģ00 series stainless steels are the larger subgroup. There are two subgroups of austenitic stainless steel. Due to their crystalline structure, austenitic steels are not hardenable by heat treatment and are essentially non-magnetic. This austenite crystalline structure is achieved by sufficient additions of the austenite stabilizing elements nickel, manganese and nitrogen. Austenitic stainless steels possess austenite as their primary crystalline structure (face centered cubic). Stainless steels may be classified by their crystalline structure into four main types: austenitic, ferritic, martensitic and duplex stainless steel. Austenitic Stainless SteelĪustenitic stainless steel is a specific type of stainless steel alloy. In this article we will discuss SS 316 and SS 316L and 316H. We know the various names of stainless steel that are included in the austenitic grade category, namely: AISI / SUS 201, 202, 301, 302, 303, 304, 305, 309, 310, 316, 317, 327, 347.
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