{"id":3587,"date":"2026-09-16T11:03:21","date_gmt":"2026-09-16T08:03:21","guid":{"rendered":"https:\/\/www.defencemetal.com\/index.php\/en\/incoloy-925\/"},"modified":"2026-09-25T16:26:17","modified_gmt":"2026-09-25T13:26:17","slug":"incoloy-925","status":"publish","type":"page","link":"https:\/\/www.defencemetal.com\/index.php\/en\/incoloy-925\/","title":{"rendered":"Incoloy 925"},"content":{"rendered":"

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Incoloy 925 \/ UNS N09925<\/h1>\n
DEFENCE METAL<\/span><\/p>\n
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Incoloy 925<\/div>\n
UNS N09925 \u00b7 age-hardenable (precipitation-hardening) Ni-Fe-Cr alloy \u00b7 42.0-46.0% Ni \u2013 19.5-22.5% Cr \u2013 22% Fe min \u2013 2.50-3.50% Mo \u2013 1.50-3.00% Cu \u2013 1.90-2.40% Ti \u2013 0.10-0.50% Al \u2013 0.03% C max. Strengthening comes from the Ni\u2083(Ti,Al) \u03b3’ precipitate; Mo and Cu carry pitting and reducing-acid resistance, Cr carries oxidising-environment resistance. Some specification families use a wider Ni and Cr band (38.0-46.0% Ni, 19.5-23.5% Cr) \u2014 see contradictions. No Werkstoff number could be confirmed against four independent sources.<\/div>\n
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Not to be confused with<\/div>\n

Incoloy 825<\/a><\/div>\n<\/div>\n

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For what<\/div>\n
Bought for parts that need high yield strength AND resistance to sulfide stress cracking (SSC) and chloride stress-corrosion cracking AT THE SAME TIME in H\u2082S-bearing (sour) oil and natural gas.<\/div>\n<\/div>\n
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Forms<\/div>\n
Round bar \u00b7 flat bar \u00b7 plate \u00b7 sheet \u00b7 tube and pipe \u00b7 forgings. All forms are supplied to order.<\/div>\n<\/div>\n
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Standards<\/div>\n
THERE IS NO AMS \u2014 no published SAE AMS specification for this alloy could be found, and aerospace specification listings give no AMS number for it either. \u00b7 ASTM B805 \u2014 bar and wire; hot or cold finished rounds, squares, hexagons and rectangles, and cold finished wire. The alloys in B805 are N07716, N07725, N07773, N07776, N09777 and N09925. \u00b7 ASTM B872 \u2014 plate, sheet and strip; the alloys covered are N09908, N09925 and N07725. \u00b7 ASTM B983 \u2014 seamless pipe and tube; cold worked, cold worked plus precipitation hardened, or solution annealed plus precipitation hardened conditions. \u00b7 API Std 6ACRA \u2014 ‘Age-hardened Nickel-based Alloys for Oil and Gas Drilling and Production Equipment’; the alloys covered are N07718, N07716, N07725, N09925, N09935 and N09945. It sets the production route, chemical composition, mechanical properties, microstructure and test conditions for pressure-containing and pressure-controlling API 6A components. \u00b7 ANSI\/NACE MR0175 \/ ISO 15156-3 \u2014 sour service; N09925 is listed in the Annex A tables.
API 6A718 DOES NOT COVER THIS ALLOY. API 6A718 is for Alloy 718 (UNS N07718) only; API Std 6ACRA states in its own scope that it ‘expands the scope of API 6A718’ and that ‘with its issuance, it replaces API 6A718, 2nd Edition in its entirety’.<\/span><\/div>\n<\/div>\n
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Advantage<\/div>\n
In the aged condition it delivers at least 965 MPa (140 ksi) tensile and 758-965 MPa (110-140 ksi) yield strength without exceeding the 38 HRC (258-352 HBW) hardness ceiling that sour service allows.<\/div>\n<\/div>\n
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Welding<\/div>\n
The following is taken from the technical bulletin of Special Metals, who developed the alloy; it could NOT be confirmed against four independent sources and is therefore not shown as a diagram. Filler metal: INCOLOY alloy 725 welding products \u2014 INCO-WELD filler metal 725NDUR.<\/div>\n<\/div>\n
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Limits<\/div>\n
Service temperature: the alloy retains a substantial part of its strength up to about 650 \u00b0C (1200 \u00b0F). That is a structural strength ceiling, not an oxidation ceiling. It is not bought for continuous service above 650 \u00b0C.<\/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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