{"id":3619,"date":"2026-09-16T11:08:09","date_gmt":"2026-09-16T08:08:09","guid":{"rendered":"https:\/\/www.defencemetal.com\/index.php\/en\/13-8ph\/"},"modified":"2026-09-25T16:29:40","modified_gmt":"2026-09-25T13:29:40","slug":"13-8ph","status":"publish","type":"page","link":"https:\/\/www.defencemetal.com\/index.php\/en\/13-8ph\/","title":{"rendered":"13-8Ph \/ 1.4534"},"content":{"rendered":"

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13-8Ph \/ 1.4534 \/ UNS S13800 \/ AMS 5629 \/ AMS 5864<\/h1>\n
DEFENCE METAL<\/span><\/p>\n
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13-8 Mo PH<\/div>\n
UNS S13800 \u00b7 W.Nr. 1.4534 \u00b7 X3CrNiMoAl13-8-2 \u00b7 ASTM Grade XM-13 \u00b7 12.25-13.25% Cr \u2013 7.50-8.50% Ni \u2013 2.00-2.50% Mo \u2013 0.90-1.35% Al \u2013 C \u2264 0.05% \u2013 P \u2264 0.010% \u2013 S \u2264 0.008% \u2013 Si \u2264 0.10% \u2013 N \u2264 0.010% \u2013 Mn \u2264 0.10% (AMS 5629) \/ \u2264 0.20% (ASTM A564)<\/div>\n
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Not to be confused with<\/div>\n

17-4Ph<\/a><\/div>\n<\/div>\n

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For what<\/div>\n
Martensitic precipitation-hardening stainless steel. Hardening comes from nickel-aluminium precipitates rather than carbides, which is why carbon is held below 0.05%. Vacuum induction melting followed by consumable electrode remelting (VIM + VAR\/ESR) is a specification requirement.<\/div>\n<\/div>\n
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Forms<\/div>\n
Round bar \u00b7 Flat bar \u00b7 Plate \u00b7 Sheet \u00b7 Tube \u00b7 Forging<\/div>\n<\/div>\n
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Standards<\/div>\n
AMS 5629<\/b> (bars, wire, forgings, flash-welded rings, extrusions up to 305 mm nominal diameter \u2014 vacuum induction plus consumable electrode melted, premium aircraft-quality) \u00b7 AMS 5864<\/b> (plate \u2014 vacuum induction plus consumable electrode melted) \u00b7 AMS 5934<\/b> (bars, wire, forgings, rings, extrusions \u2014 “Extra High Toughness” grade, VIM plus consumable electrode melted) \u00b7 AMS 5840<\/b> (welding wire, vacuum melted) \u00b7 ASTM A564 \/ ASME SA-564 Grade XM-13 (bars, wire, shapes) \u00b7 ASTM A693 \/ ASME SA-693 Grade XM-13 (plate, sheet, strip) \u00b7 ASTM A705 \/ ASME SA-705 Grade XM-13 (forgings) \u00b7 W.Nr. 1.4534
The SAE title of AMS 5629 carries the wording “Vacuum Induction Plus Consumable Electrode Melted, Premium Aircraft-Quality”: vacuum induction melting followed by consumable electrode remelting (VAR or ESR) is MANDATORY, not optional.<\/span><\/div>\n<\/div>\n
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Advantage<\/div>\n
Compared on the minima of one and the same standard (ASTM A564), the difference is numerical. The highest-strength condition of XM-13, H950: minimum 1515 MPa tensile \/ 1415 MPa yield.<\/div>\n<\/div>\n
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Welding<\/div>\n
Filler metal: the matching filler is AMS 5840<\/b> welding wire (13Cr \u2013 8.0Ni \u2013 2.3\/2.4Mo \u2013 1.1Al, vacuum melted). Where high weld strength is not needed, austenitic AWS ER308L may be used (High Temp Metals and ARMCO give it as the secondary option; that weld metal does not respond to ageing).<\/div>\n<\/div>\n
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Limits<\/div>\n
Service temperature: the sources conflict and no single ceiling figure can be given. The safe rule is this \u2014 service temperature must stay at least 28 \u00b0C (50 \u00b0F) BELOW the ageing temperature (Carpenter\/ARMCO and High Temp Metals); an H1050 part is therefore not run above 538 \u00b0C, an H950 part not above 482 \u00b0C.<\/div>\n<\/div>\n
REQUEST A QUOTE<\/a>All precipitation hardening steels →<\/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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