{"id":3959,"date":"2026-09-15T23:27:32","date_gmt":"2026-09-15T20:27:32","guid":{"rendered":"https:\/\/www.defencemetal.com\/?p=3959"},"modified":"2026-09-17T23:07:01","modified_gmt":"2026-09-17T20:07:01","slug":"duplex-aisi-318-super-duplex-aisi-f53-difference","status":"publish","type":"post","link":"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/15\/duplex-aisi-318-super-duplex-aisi-f53-difference\/","title":{"rendered":"What Is the Difference Between Duplex AISI 318 and Super Duplex AISI F53?"},"content":{"rendered":"

AISI 318<\/strong> (duplex 2205) and AISI F53<\/strong> (super duplex 2507) share the same metallurgical principle: a half austenite, half ferrite structure. The difference is in how far the alloy contents are raised \u2014 and the prefix \u201csuper\u201d says exactly that.<\/p>\n

Chromium, molybdenum, nitrogen: all up<\/h3>\n

According to our datasheets, F53 has chromium at 24.00\u201326.00%<\/strong> (21.00\u201323.00% in 318), molybdenum at 3.00\u20135.00%<\/strong> (2.50\u20133.50% in 318) and nitrogen at max 0.30%<\/strong> (0.10\u20130.22% in 318). Nickel also rises to 6.00\u20138.00%.<\/p>\n

Those three elements directly determine the PREN<\/strong> value, which measures a stainless steel\u2019s resistance to pitting corrosion (PREN = %Cr + 3.3\u00d7%Mo + 16\u00d7%N). While 2205 class duplex grades are typically in the 34\u201338 range, the PREN value of 2507 class super duplex grades is above 40. That threshold of 40 is also where the industry draws the line for the term \u201csuper duplex\u201d.<\/p>\n

Strength rises too: the tensile strength of 318 is 700\u2013900 MPa<\/strong> against 750\u2013930 MPa<\/strong> for F53. Hardness reaches up to 270 HB. In exchange, elongation rises from 20% to 25% \u2014 so F53, despite being stronger, is not less ductile.<\/p>\n

Comparison in numbers<\/h3>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
PROPERTY<\/th>\nAISI 318 (Duplex)<\/th>\nAISI F53 (Super Duplex)<\/th>\n<\/tr>\n<\/thead>\n
Carbon (C)<\/td>\nmax 0.03%<\/td>\nmax 0.030%<\/td>\n<\/tr>\n
Chromium (Cr)<\/td>\n21.00 \u2013 23.00%<\/td>\n24.00 \u2013 26.00%<\/td>\n<\/tr>\n
Nickel (Ni)<\/td>\n4.50 \u2013 6.50%<\/td>\n6.00 \u2013 8.00%<\/td>\n<\/tr>\n
Molybdenum (Mo)<\/td>\n2.50 \u2013 3.50%<\/td>\n3.00 \u2013 5.00%<\/td>\n<\/tr>\n
Nitrogen (N)<\/td>\n0.10 \u2013 0.22%<\/td>\nmax 0.30%<\/td>\n<\/tr>\n
Copper (Cu)<\/td>\n\u2014<\/td>\nmax 0.5%<\/td>\n<\/tr>\n
Sulphur (S)<\/td>\nmax 0.02%<\/td>\nmax 0.015%<\/td>\n<\/tr>\n
Tensile strength Rm<\/td>\n700 \u2013 900 MPa<\/td>\n750 \u2013 930 MPa<\/td>\n<\/tr>\n
Yield strength Rp0.2<\/td>\n460 \u2013 500 MPa<\/td>\n\u2014<\/td>\n<\/tr>\n
Elongation A50<\/td>\n20%<\/td>\n25%<\/td>\n<\/tr>\n
Hardness<\/td>\n\u2014<\/td>\nmax 260 HB<\/td>\n<\/tr>\n
Density<\/td>\n7.805 g\/cm\u00b3<\/td>\n7.75 g\/cm\u00b3<\/td>\n<\/tr>\n
Modulus of elasticity<\/td>\n200 GPa<\/td>\n210 GPa<\/td>\n<\/tr>\n
UNS<\/td>\nS31803 \u00b7 S32205<\/td>\nS32750<\/td>\n<\/tr>\n
W.Nr (DIN\/EN)<\/td>\n1.4462<\/td>\n1.4410<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Values are taken from our product datasheets; section thickness and the applied heat treatment regime change the result.<\/p>\n

Which one, and when?<\/h3>\n

AISI 318 is sufficient<\/strong> \u2014 chemical and petrochemical process piping, pressure vessels, paper industry equipment, bridge and structural members, marine applications with a moderate chloride load. It is easier to source and markedly lower in cost.<\/p>\n

AISI F53 is required<\/strong> \u2014 systems in direct contact with seawater, offshore platform pipelines, desalination plants, hot process fluids with a high chloride content, wellhead equipment. If the specification asks for PREN \u2265 40, 318 cannot meet it.<\/p>\n

Welding and heat treatment are critical in both materials: if they spend a long time in the 300\u20131000 \u00b0C range, sigma phase forms and the material becomes brittle. Super duplex grades are more sensitive to this than duplex grades.<\/p>\n

Neighbouring grades<\/h3>\n

For alternatives in the same class with copper and tungsten additions there are AISI F55<\/a> and AISI F255<\/a>. For a comparison of the duplex structure with its austenitic equivalents, see our AISI 316L \u2013 Duplex 318 article<\/a>.<\/p>\n

\n

Technical datasheets<\/p>\n

AISI 318 \u2014 chemical composition, mechanical values, standard equivalents<\/a><\/p>\n

AISI F53 \u2014 chemical composition, mechanical values, standard equivalents<\/a><\/p>\n

Both grades are supplied to order in round bar, flat bar, plate, sheet, pipe and forged forms. Contact us<\/a> for a quotation.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Super duplex F53 contains more chromium, molybdenum and nitrogen than duplex 318; it was developed for seawater environments.<\/p>\n","protected":false},"author":1,"featured_media":3389,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-3959","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-comparisons"],"yoast_head":"\nWhat Is the Difference Between Duplex AISI 318 and Super Duplex AISI F53? - Defence Metal<\/title>\n<meta name=\"description\" content=\"Super duplex F53 contains more chromium, molybdenum and nitrogen than duplex 318; it was developed for seawater environments.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/15\/duplex-aisi-318-super-duplex-aisi-f53-difference\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What Is the Difference Between Duplex AISI 318 and Super Duplex AISI F53? 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