{"id":3955,"date":"2026-09-15T23:23:41","date_gmt":"2026-09-15T20:23:41","guid":{"rendered":"https:\/\/www.defencemetal.com\/?p=3955"},"modified":"2026-09-17T23:07:05","modified_gmt":"2026-09-17T20:07:05","slug":"17-4ph-13-8ph-difference","status":"publish","type":"post","link":"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/15\/17-4ph-13-8ph-difference\/","title":{"rendered":"What Is the Difference Between 17-4PH and 13-8PH?"},"content":{"rendered":"

17-4PH<\/strong> and 13-8PH<\/strong> belong to the same family \u2014 precipitation hardening stainless steels \u2014 but their hardening mechanisms differ. That difference shows itself less in the strength reached than in the cleanliness<\/strong> and toughness<\/strong> of the material.<\/p>\n

Aluminium instead of copper<\/h3>\n

17-4PH hardens through the copper precipitates<\/strong> formed in the structure during ageing; its composition contains 3.00\u20135.00% copper. 13-8PH contains no copper; its hardening comes from the intermetallic precipitates that 0.90\u20131.35% aluminium<\/strong> forms with nickel. In addition, 2.00\u20132.50% molybdenum<\/strong> is added to 13-8PH \u2014 there is no molybdenum in 17-4PH.<\/p>\n

The second difference, at least as important as composition, is the production method. 13-8PH is vacuum melted and its impurities are very tightly limited: phosphorus max 0.010%<\/strong>, sulphur max 0.008%<\/strong>, silicon and manganese max 0.10\u20130.20%<\/strong>. The same values in 17-4PH are 0.040%, 0.030% and 1.00% respectively. That cleanliness raises fracture toughness and fatigue life directly.<\/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
PROPERTY<\/th>\n17-4PH<\/th>\n13-8PH<\/th>\n<\/tr>\n<\/thead>\n
Carbon (C)<\/td>\nmax 0.070%<\/td>\nmax 0.050%<\/td>\n<\/tr>\n
Chromium (Cr)<\/td>\n15.00 \u2013 17.50%<\/td>\n12.25 \u2013 13.25%<\/td>\n<\/tr>\n
Nickel (Ni)<\/td>\n3.00 \u2013 5.00%<\/td>\n7.50 \u2013 8.50%<\/td>\n<\/tr>\n
Copper (Cu)<\/td>\n3.00 \u2013 5.00%<\/td>\n\u2014<\/td>\n<\/tr>\n
Molybdenum (Mo)<\/td>\n\u2014<\/td>\n2.00 \u2013 2.50%<\/td>\n<\/tr>\n
Aluminium (Al)<\/td>\n\u2014<\/td>\n0.90 \u2013 1.35%<\/td>\n<\/tr>\n
Niobium + Tantalum<\/td>\n0.15 \u2013 0.45%<\/td>\n\u2014<\/td>\n<\/tr>\n
Manganese (Mn)<\/td>\nmax 1.00%<\/td>\nmax 0.20%<\/td>\n<\/tr>\n
Silicon (Si)<\/td>\nmax 1.00%<\/td>\nmax 0.10%<\/td>\n<\/tr>\n
Phosphorus (P)<\/td>\nmax 0.040%<\/td>\nmax 0.010%<\/td>\n<\/tr>\n
Sulphur (S)<\/td>\nmax 0.030%<\/td>\nmax 0.008%<\/td>\n<\/tr>\n
Tensile strength Rm<\/td>\n\u2014<\/td>\n1480 MPa<\/td>\n<\/tr>\n
Yield strength Rp0.2<\/td>\n\u2014<\/td>\n1415 MPa<\/td>\n<\/tr>\n
Elongation A50<\/td>\n\u2014<\/td>\n13%<\/td>\n<\/tr>\n
UNS<\/td>\nS17400<\/td>\nS13800<\/td>\n<\/tr>\n
W.Nr (DIN\/EN)<\/td>\n1.4542<\/td>\n1.4534<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Values are taken from our product datasheets. In both grades the mechanical values depend on the ageing regime applied (H900, H1000, H1025, H1150 and so on); the table gives the values from our datasheet for 13-8PH.<\/p>\n

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

17-4PH is sufficient<\/strong> \u2014 pump shafts, valve components, fasteners, tooling parts, general purpose high-strength stainless components. It is easy to source and low in cost.<\/p>\n

13-8PH is required<\/strong> \u2014 aircraft landing gear components, critical actuator shafts, parts where fatigue life and fracture toughness are stated as numbers in the specification. It is more expensive and takes longer to source; but when the toughness limit of 17-4PH has been reached, there is no alternative.<\/p>\n

The grade in between<\/h3>\n

For requirements between the two there is 15-5PH<\/a>; we explained its difference from 17-4PH in this article<\/a>.<\/p>\n

\n

Technical datasheets<\/p>\n

17-4PH \u2014 chemical composition, mechanical values, standard equivalents<\/a><\/p>\n

13-8PH \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":"

17-4PH hardens with copper, 13-8PH with aluminium; 13-8PH gives a cleaner structure and higher toughness.<\/p>\n","protected":false},"author":1,"featured_media":3385,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-3955","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-comparisons"],"yoast_head":"\nWhat Is the Difference Between 17-4PH and 13-8PH? - Defence Metal<\/title>\n<meta name=\"description\" content=\"17-4PH hardens with copper, 13-8PH with aluminium; 13-8PH gives a cleaner structure and higher toughness.\" \/>\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\/17-4ph-13-8ph-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 17-4PH and 13-8PH? 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