{"id":3962,"date":"2026-09-15T23:36:41","date_gmt":"2026-09-15T20:36:41","guid":{"rendered":"https:\/\/www.defencemetal.com\/?p=3962"},"modified":"2026-09-17T23:06:57","modified_gmt":"2026-09-17T20:06:57","slug":"inconel-718-waspaloy-difference","status":"publish","type":"post","link":"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/15\/inconel-718-waspaloy-difference\/","title":{"rendered":"What Is the Difference Between Inconel 718 and Waspaloy?"},"content":{"rendered":"

Inconel 718<\/strong> and Waspaloy<\/strong> are two superalloys used side by side in the hot section of gas turbines. Both are precipitation hardening, but the type of precipitate differs \u2014 and that difference sets the temperature to which the material will hold up.<\/p>\n

Niobium precipitate, or gamma prime?<\/h3>\n

Inconel 718 takes its strength largely from the precipitates formed by 4.75\u20135.50% niobium + tantalum<\/strong>. That phase is very favourable for manufacturing and welding \u2014 the weldability of 718 is among the best of the superalloys. However, it begins to lose its stability above roughly 650 \u00b0C<\/strong>.<\/p>\n

There is no niobium in Waspaloy. In its place are 2.75\u20133.50% titanium<\/strong> and 1.20\u20131.60% aluminium<\/strong>; these combine with nickel to form the classic gamma prime<\/strong> phase. That phase stays stable at far higher temperatures. On top of it, 12\u201315% cobalt<\/strong> is added \u2014 cobalt delays the softening of the matrix at high temperature.<\/p>\n

According to our datasheet, Waspaloy shows superior creep stability in the 750\u2013870 \u00b0C range<\/strong>. Its tensile strength is 1200\u20131500 MPa<\/strong> and its hardness 35\u201345 HRC<\/strong>.<\/p>\n

The price is machinability and welding: alloys with a high gamma prime content are prone to cracking during welding and are difficult to machine. In addition, the 12.0\u201324.0% iron<\/strong> in the composition of 718 is only max 2.0%<\/strong> in Waspaloy \u2014 which raises the cost markedly.<\/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\n\n\n
PROPERTY<\/th>\nInconel 718<\/th>\nWaspaloy<\/th>\n<\/tr>\n<\/thead>\n
Nickel (Ni)<\/td>\n50.0 \u2013 55.0%<\/td>\n58 \u2013 61%<\/td>\n<\/tr>\n
Chromium (Cr)<\/td>\n17.0 \u2013 21.0%<\/td>\n18 \u2013 21%<\/td>\n<\/tr>\n
Cobalt (Co)<\/td>\nmax 1.00%<\/td>\n12 \u2013 15%<\/td>\n<\/tr>\n
Iron (Fe)<\/td>\n12.0 \u2013 24.0%<\/td>\nmax 2.0%<\/td>\n<\/tr>\n
Molybdenum (Mo)<\/td>\n2.80 \u2013 3.30%<\/td>\n3.5 \u2013 5.0%<\/td>\n<\/tr>\n
Niobium + Tantalum<\/td>\n4.75 \u2013 5.50%<\/td>\n\u2014<\/td>\n<\/tr>\n
Titanium (Ti)<\/td>\n0.65 \u2013 1.15%<\/td>\n2.75 \u2013 3.50%<\/td>\n<\/tr>\n
Aluminium (Al)<\/td>\n0.20 \u2013 0.80%<\/td>\n1.20 \u2013 1.60%<\/td>\n<\/tr>\n
Carbon (C)<\/td>\nmax 0.08%<\/td>\n0.02 \u2013 0.10%<\/td>\n<\/tr>\n
Tensile strength Rm<\/td>\n\u2014<\/td>\n1200 \u2013 1500 MPa<\/td>\n<\/tr>\n
Yield strength Rp0.2<\/td>\n\u2014<\/td>\n~1000 MPa<\/td>\n<\/tr>\n
Hardness<\/td>\n\u2014<\/td>\n35 \u2013 45 HRC<\/td>\n<\/tr>\n
Density<\/td>\n\u2014<\/td>\n8.19 g\/cm\u00b3<\/td>\n<\/tr>\n
Melting range<\/td>\n\u2014<\/td>\n1320 \u2013 1380 \u00b0C<\/td>\n<\/tr>\n
Creep strength<\/td>\n\u2014<\/td>\nsuperior stability in the 750 \u2013 870 \u00b0C range<\/td>\n<\/tr>\n
UNS<\/td>\nN07718<\/td>\nN07001<\/td>\n<\/tr>\n
W.Nr (DIN\/EN)<\/td>\n2.4668<\/td>\n2.4654<\/td>\n<\/tr>\n
AMS<\/td>\n5596 \u00b7 5663<\/td>\n5544 \u00b7 5706<\/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

Inconel 718 is sufficient<\/strong> \u2014 turbine discs, compressor parts, highly stressed fasteners, rocket engine components, cryogenic applications. Anywhere below 650 \u00b0C, 718 is both more economical and far easier to manufacture. It is the most widely used superalloy in the industry.<\/p>\n

Waspaloy is required<\/strong> \u2014 turbine discs and shaft connections, parts around the combustion chamber, components carrying continuous load above 700 \u00b0C. If the specification calls out AMS 5544<\/strong> or AMS 5706<\/strong>, 718 is not an acceptable substitute.<\/p>\n

Neighbouring alloys<\/h3>\n

For an alternative in the same temperature class there is Nimonic 80A<\/a>, and for a more economical precipitation hardening option Incoloy A286<\/a>. For the solid solution equivalent of 718, see our Inconel 625 \u2013 718 comparison<\/a>.<\/p>\n

\n

Technical datasheets<\/p>\n

Inconel 718 \u2014 chemical composition, mechanical values, standard equivalents<\/a><\/p>\n

Waspaloy \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":"

Inconel 718 hardens with niobium, Waspaloy with titanium and aluminium; Waspaloy stays stable at higher temperatures.<\/p>\n","protected":false},"author":1,"featured_media":3392,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-3962","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-comparisons"],"yoast_head":"\nWhat Is the Difference Between Inconel 718 and Waspaloy? - Defence Metal<\/title>\n<meta name=\"description\" content=\"Inconel 718 hardens with niobium, Waspaloy with titanium and aluminium; Waspaloy stays stable at higher temperatures.\" \/>\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\/inconel-718-waspaloy-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 Inconel 718 and Waspaloy? 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