{"id":3541,"date":"2026-09-16T10:57:54","date_gmt":"2026-09-16T07:57:54","guid":{"rendered":"https:\/\/www.defencemetal.com\/index.php\/en\/maraging-350\/"},"modified":"2026-09-25T16:25:25","modified_gmt":"2026-09-25T13:25:25","slug":"maraging-350","status":"publish","type":"page","link":"https:\/\/www.defencemetal.com\/index.php\/en\/maraging-350\/","title":{"rendered":"Maraging 350 \/ AMS 6515"},"content":{"rendered":"

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Maraging 350 \/ AMS 6515<\/h1>\n
DEFENCE METAL<\/span><\/p>\n
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Maraging 350<\/div>\n
UNS K93160 \u00b7 18Ni(350) \/ C350 \u00b7 18.0-19.0% Ni \u2013 11.5-12.5% Co \u2013 4.6-5.2% Mo \u2013 1.30-1.60% Ti \u2013 0.05-0.15% Al \u2013 C \u2264 0.03%<\/div>\n
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Not to be confused with<\/div>\n

Maraging 300<\/a><\/div>\n<\/div>\n

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For what<\/div>\n
The highest-strength grade of the maraging family. Cobalt is raised to 12% and titanium to 1.4%; carbon is still 0.03% max and hardening is again by intermetallic precipitation.<\/div>\n<\/div>\n
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Forms<\/div>\n
Round bar \u00b7 Flat bar \u00b7 Plate \u00b7 Sheet \u00b7 Tube \u00b7 Forgings<\/div>\n<\/div>\n
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Standards<\/div>\n
AMS 6515<\/b> (bars, forgings, tubing, rings \u2014 double vacuum melted, annealed) \u00b7 MIL-S-46850 (350 ksi class; bar, plate, sheet, strip, forgings, extrusions; fracture toughness requirements apply) \u00b7 UNS K93160
The AMS numbers have been verified against the grade, because they are frequently confused in the trade. The nominal compositions in the SAE title records are: AMS 6512 = 18Ni-7.8Co-4.9Mo-0.40Ti (Maraging 250), AMS 6514 = 18.5Ni-9.0Co-4.9Mo-0.65Ti (Maraging\u2026<\/span><\/div>\n<\/div>\n
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Advantage<\/div>\n
The part is machined to finished size soft, then hardened, and its dimensions barely move. In the solution annealed condition it is 28-35 HRC and is machined in that state; 3-6 hours at 480-510 \u00b0C raises it to 53-58 HRC with no quench.<\/div>\n<\/div>\n
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Welding<\/div>\n
Filler metal: maraging wire of approximately the same composition as the base metal; for Maraging 300 the verified AMS number is AMS 6463<\/b> (18.5Ni-8.5Co-5.2Mo-0.72Ti-0.10Al, vacuum melted).<\/div>\n<\/div>\n
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Limits<\/div>\n
It is not stainless. It contains no chromium and does not exhibit passive behaviour in 3% NaCl; it rusts like carbon steel in the atmosphere and in marine environments and must be protected (cadmium plating, phosphating, paint or similar). Carpenter data sheets classify its corrosion resistance as ‘Humidity Restricted’;<\/div>\n<\/div>\n
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Compiled from manufacturer data sheets \u00b7 confirm against the current specification before ordering<\/div>\n<\/div>\n<\/div>\n

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