{"id":3539,"date":"2026-09-16T10:57:46","date_gmt":"2026-09-16T07:57:46","guid":{"rendered":"https:\/\/www.defencemetal.com\/index.php\/en\/haynes-25\/"},"modified":"2026-09-25T16:25:31","modified_gmt":"2026-09-25T13:25:31","slug":"haynes-25","status":"publish","type":"page","link":"https:\/\/www.defencemetal.com\/index.php\/en\/haynes-25\/","title":{"rendered":"Haynes 25 \/ (L-605) \/ AMS 5537 \/ AMS 5759"},"content":{"rendered":"

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Haynes 25 \/ (L-605) \/ UNS R30605 \/ AMS 5537 \/ AMS 5759<\/h1>\n
DEFENCE METAL<\/span><\/p>\n
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Haynes 25 (L-605)<\/div>\n
UNS R30605 \u00b7 W.Nr. 2.4964 \u00b7 L-605 \/ Alloy 25 \/ GH605 \u00b7 IT IS COBALT-BASED, NOT NICKEL-BASED: Co balance (~51-52%) \u2013 Cr 19.0-21.0% \u2013 W 14.0-16.0% \u2013 Ni 9.0-11.0% \u2013 Mn 1.0-2.0% \u2013 C 0.05-0.15% \u2013 Si 0.40% max \u2013 Fe 3.0% max \u2013 P 0.040% max \u2013 S 0.030% max. Nickel is only about 10% and is there to keep the austenitic structure stable; the carrier element is cobalt. Density 9.13 g\/cm3 \u2014 markedly heavier than the nickel-base superalloys.<\/div>\n
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Not to be confused with<\/div>\n

Inconel 625<\/a><\/div>\n<\/div>\n

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For what<\/div>\n
A cobalt-based high-temperature alloy strengthened by solid solution and carbides. It is NOT PRECIPITATION HARDENABLE; there is no gamma-prime or gamma-double-prime precipitation and it cannot be hardened by ageing.<\/div>\n<\/div>\n
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Forms<\/div>\n
Round bar \u00b7 flat bar \u00b7 plate \u00b7 sheet \u00b7 strip \u00b7 foil \u00b7 tube \u00b7 forging \u00b7 ring. All forms are supplied to order.<\/div>\n<\/div>\n
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Standards<\/div>\n
AMS 5537<\/b> \u2014 sheet, strip, foil and plate; SAE title ‘Cobalt Alloy, Corrosion- and Heat-Resistant, Sheet, Strip, Foil, and Plate 52Co – 20Cr – 10Ni – 15W Solution Heat Treated’. \u00b7 AMS 5759<\/b> \u2014 bars, forgings and rings; SAE title ‘Cobalt Alloy, Corrosion and Heat-Resistant, Bars, Forgings, and Rings 52Co – 20Cr – 10Ni – 15W Solution Heat Treated’. \u00b7 AMS 5796<\/b> \u2014 welding wire; SAE title ‘Cobalt Alloy, Corrosion and Heat-Resistant, Welding Wire 52Co – 20Cr – 10Ni – 15W’. \u00b7 AMS 5797<\/b> \u2014 covered welding electrodes; SAE title ‘Cobalt Alloy, Corrosion and Heat-Resistant, Covered Welding Electrodes 51.5Co – 20Cr – 10Ni – 15W’. \u00b7 ASTM F90 \u2014 surgical implant quality; title ‘Standard Specification for Wrought Cobalt-20Chromium-15Tungsten-10Nickel Alloy for Surgical Implant Applications’, UNS R30605, bars, rods, wires, sheets and strips. \u00b7 MIL-C-24252 \u00b7 NACE MR0175 \/ ISO 15156 \u00b7 BS HR 40 \u00b7 GB\/T GH605 \/ GH5605.
The SAE titles of all four AMS numbers were read one by one in this work, and all four were confirmed to belong to the 52Co-20Cr-10Ni-15W composition, that is, to this alloy.<\/span><\/div>\n<\/div>\n
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Advantage<\/div>\n
Being cobalt-based, it keeps its strength in the 900-1000 \u00b0C band where nickel-base solid-solution alloys weaken. In the solution-annealed condition it gives about 476-517 MPa yield and 1000-1061 MPa tensile at room temperature, while at 982 \u00b0C it retains about 129 MPa yield and 188 MPa tensile\u2026<\/div>\n<\/div>\n
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Welding<\/div>\n
It can be welded by GTAW, GMAW, SMAW, electron beam and resistance welding. The filler metal is of MATCHING composition: AMS 5796<\/b> welding wire or AMS 5797<\/b> covered electrodes. Preheat is NOT required. The interpass temperature is kept below 93 \u00b0C (200 \u00b0F).<\/div>\n<\/div>\n
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Limits<\/div>\n
NOT PRECIPITATION HARDENABLE. There is NO solution treatment plus ageing cycle; there is no condition like H900 or the 720 \u00b0C + 620 \u00b0C cycle of alloy 718. Strength is raised only by cold work, and that increase is lost to recrystallisation at elevated temperature.<\/div>\n<\/div>\n
REQUEST A QUOTE<\/a>All nickel alloys →<\/a>TECHNICAL DETAILS ↓<\/span><\/div>\n
Compiled from manufacturer data sheets \u00b7 confirm against the current specification before ordering<\/div>\n<\/div>\n<\/div>\n

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