{"id":3569,"date":"2026-09-16T11:01:33","date_gmt":"2026-09-16T08:01:33","guid":{"rendered":"https:\/\/www.defencemetal.com\/index.php\/en\/monel-k500\/"},"modified":"2026-09-25T16:28:46","modified_gmt":"2026-09-25T13:28:46","slug":"monel-k500","status":"publish","type":"page","link":"https:\/\/www.defencemetal.com\/index.php\/en\/monel-k500\/","title":{"rendered":"Monel K500"},"content":{"rendered":"

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Monel K500 \/ (2.4375) \/ UNS N05500 \/ AMS 4676<\/h1>\n
DEFENCE METAL<\/span><\/p>\n
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Monel K-500<\/div>\n
UNS N05500 \u00b7 W.Nr. 2.4375 \u00b7 NiCu30Al (DIN 17743) \u00b7 ISO NiCu30Al3Ti \u00b7 BS NA18 \u00b7 63.0 Ni+Co min \u2013 27.0-33.0 Cu \u2013 2.30-3.15 Al \u2013 0.35-0.85 Ti. It is the PRECIPITATION HARDENABLE derivative of Monel 400, with aluminium and titanium added; the strengthening comes from the gamma-prime Ni3(Al,Ti) precipitate.<\/div>\n
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Not to be confused with<\/div>\n

Monel 400<\/a><\/div>\n<\/div>\n

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For what<\/div>\n
Bought where the corrosion behaviour of Monel 400 is wanted but its strength is not enough: seawater and sour-service pump and propeller shafts, valve trim, bolts and studs, downhole tools, springs, non-magnetic parts. The material is hardened by solution annealing plus ageing;<\/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 Forging (all forms supplied to order)<\/div>\n<\/div>\n
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Standards<\/div>\n
AMS 4676<\/b> \u2014 the ONLY AMS number; it covers BARS and FORGINGS only (SAE title: “Nickel-Copper Alloy, Corrosion-Resistant, Bars and Forgings 66.5Ni – 3.0Al – 0.62Ti – 28Cu Hot-Finished, Precipitation Hardenable”). ASTM B865 \/ ASME SB-865 (bar, rod, wire, forgings and forging stock) \u00b7 ASTM F468 (bolts, studs) \u00b7 ASTM F467 (nuts) \u00b7 QQ-N-286 (Rev. E \/ F \/ G) \u00b7 ASME Code Case 1192 (bolting) \u00b7 DIN 17743 \u00b7 DIN 17750 (sheet\/plate) \u00b7 DIN 17751 (tube) \u00b7 DIN 17752 (bar) \u00b7 DIN 17753 (wire) \u00b7 DIN 17754 (forgings) \u00b7 BS 3072\/3073\/3074\/3075\/3076 NA18 \u00b7 ISO 6208 \u00b7 ISO 9723 \u00b7 ISO 9724 \u00b7 ISO 9725 \u00b7 NACE MR0175 \/ ISO 15156-3 \u00b7 NACE MR0103 \u00b7 MIL-N-24549
The ONLY published AMS number for N05500 is AMS 4676, and its scope is limited to BAR + FORGING, in the “hot-finished, precipitation hardenable” condition. There is NO AMS number for PLATE, SHEET, STRIP or TUBE;<\/span><\/div>\n<\/div>\n
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Advantage<\/div>\n
It multiplies the yield strength while keeping the same Ni-Cu matrix. On specification minimums: annealed Monel 400 bar gives 170 MPa (25 ksi) yield in ASTM B164, while hot-worked and age-hardened N05500 bar gives 690 MPa (100 ksi) yield and 965 MPa (140 ksi) tensile in ASTM B865 \u2014 about 4 times\u2026<\/div>\n<\/div>\n
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Welding<\/div>\n
Welding is done in the ANNEALED \/ solution-annealed condition, not in the aged condition. Filler metal: Monel Filler Metal 60 = AWS A5.14 ERNiCu-7 (GTAW\/GMAW); covered electrode Monel 190 = AWS A5.11 ENiCu-7. Preheat is not required. ERNiCu-7 weld metal does not precipitation harden;<\/div>\n<\/div>\n
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Limits<\/div>\n
1) HYDROGEN EMBRITTLEMENT: components under cathodic protection in seawater suffer intergranular hydrogen environment-assisted cracking. In peer-reviewed measurements intergranular cracking starts at -800 mV(SCE) and more negative; the threshold stress intensity K_TH falls from about 45 MPa\u221am at -800 mV to about 22 MPa\u221am at -1000 mV.<\/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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