{"id":3613,"date":"2026-09-16T11:06:50","date_gmt":"2026-09-16T08:06:50","guid":{"rendered":"https:\/\/www.defencemetal.com\/index.php\/en\/17-7ph\/"},"modified":"2026-09-25T16:25:15","modified_gmt":"2026-09-25T13:25:15","slug":"17-7ph","status":"publish","type":"page","link":"https:\/\/www.defencemetal.com\/index.php\/en\/17-7ph\/","title":{"rendered":"17-7Ph \/ 1.4568"},"content":{"rendered":"

<\/p>\n

17-7Ph \/ 1.4568 \/ UNS S17700 \/ AMS 5528 \/ AMS 5529<\/h1>\n
DEFENCE METAL<\/span><\/p>\n
\n
17-7 PH<\/div>\n
UNS S17700 \u00b7 W.Nr. 1.4568 \u00b7 X7CrNiAl17-7 \u00b7 AISI\/SAE 631 \u00b7 16.00-18.00% Cr \u2013 6.50-7.75% Ni \u2013 0.75-1.50% Al \u2013 C \u2264 0.09% \u2013 Mn \u2264 1.00% \u2013 Si \u2264 1.00% \u2013 P \u2264 0.040% \u2013 S \u2264 0.030% \u2013 balance Fe<\/div>\n
\n
Not to be confused with<\/div>\n

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

\n
\n
For what<\/div>\n
A semi-austenitic precipitation hardening stainless steel. Its structural difference from 17-4 PH and 15-5 PH is this: as delivered in Condition A the structure is AUSTENITIC (about HRB 85, \u2265 20% elongation) and it is cut, bent and drawn like 301\/304.<\/div>\n<\/div>\n
\n
Forms<\/div>\n
Round bar \u00b7 Flat bar \u00b7 Plate \u00b7 Sheet \u00b7 Tube \u00b7 Forging (all forms supplied to order)<\/div>\n<\/div>\n
\n
Standards<\/div>\n
AMS 5528<\/b> (sheet, strip and plate \u2014 solution heat treated, Condition A; current revision K\/2024) \u00b7 AMS 5529<\/b> (sheet and strip \u2014 solution heat treated and cold rolled, Condition C; 0.038-2.54 mm nominal thickness) \u00b7 AMS 5568<\/b> (WELDED tubing \u2014 solution heat treated) \u00b7 AMS 5644<\/b> (bars and forgings; current revision E\/2017) \u00b7 AMS 5678<\/b> (wire \u2014 cold drawn) \u00b7 AMS 5824<\/b> (welding wire, 17Cr-7.1Ni-1.0Al) \u00b7 ASTM A693 \/ ASME SA-693 Type 631 (plate, sheet, strip) \u00b7 ASTM A564 \/ ASME SA-564 Type 631 (bars and shapes) \u00b7 ASTM A705 \/ ASME SA-705 Type 631 (forgings) \u00b7 ASTM A313 Type 631 (spring wire) \u00b7 W.Nr. 1.4568 \/ X7CrNiAl17-7
1) AMS 5824 BELONGS TO A DIFFERENT UNS: it is a welding wire specification and its material is UNS S17780, not S17700. Do not write AMS 5824 on a sheet or bar order.<\/span><\/div>\n<\/div>\n
\n
Advantage<\/div>\n
The part is formed soft and gains its strength AFTERWARDS, with no quench from a high temperature in the process. In numbers: in Condition A the sheet\/strip specification limits are \u2264 1034 MPa tensile, \u2264 HRB 92, \u2265 20% elongation;<\/div>\n<\/div>\n
\n
Welding<\/div>\n
Filler metal: the matching filler is AMS 5824<\/b> welding wire (17Cr-7.1Ni-1.0Al, UNS S17780). Where matching strength is not required, austenitic fillers are used; Hobart Brothers recommends the 309 type (preferably low-carbon 309L or stabilized 309Cb) when matching filler is not required.<\/div>\n<\/div>\n
\n
Limits<\/div>\n
Service temperature: the sources do not agree on a single ceiling. The statement that mechanical properties are retained up to 482 \u00b0C (900 \u00b0F) in the heat-treated condition is common to Cleveland-Cliffs, Ulbrich and METALCOR (480 \u00b0C); AZoM gives 427 \u00b0C (800 \u00b0F).<\/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

<\/p>\n