{"id":3621,"date":"2026-09-16T11:08:17","date_gmt":"2026-09-16T08:08:17","guid":{"rendered":"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-f53\/"},"modified":"2026-09-25T21:14:49","modified_gmt":"2026-09-25T18:14:49","slug":"aisi-f53","status":"publish","type":"page","link":"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-f53\/","title":{"rendered":"AISI F53 \/ (1.4410)"},"content":{"rendered":"

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AISI F53 \/ (1.4410) \/ UNS S32750<\/h1>\n
DEFENCE METAL<\/span><\/p>\n
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F53 (2507)<\/div>\n
UNS S32750 \u00b7 W.Nr. 1.4410 \u00b7 X2CrNiMoN25-7-4 \u00b7 in ASTM A240: 24.0-26.0% Cr \u2013 6.0-8.0% Ni \u2013 3.00-5.00% Mo \u2013 0.24-0.32% N \u2013 Cu \u2264 0.50% \u2013 C \u2264 0.03% \u2013 balance Fe. ITS NITROGEN BAND IS THE HIGHEST OF THE FIVE (0.24-0.32%) and its molybdenum band the widest (3.00-5.00%); that is what gives it the highest calculated PREN ceiling of the five (47.6). It is a ferritic-austenitic (super duplex) stainless steel; it is NOT PRECIPITATION HARDENABLE, NOT AGED, and its only heat treatment is solution annealing followed by a rapid quench.<\/div>\n
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Not to be confused with<\/div>\n

AISI 318<\/a>AISI F55<\/a><\/div>\n<\/div>\n

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For what<\/div>\n
It is bought for seawater and hot chloride service where the highest-strength super duplex is required: seawater piping systems, desalination plant, chemical process equipment, flue gas scrubbers, offshore production equipment, heat exchangers.<\/div>\n<\/div>\n
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Forms<\/div>\n
Round bar \u00b7 Flat bar \u00b7 Plate \u00b7 Sheet \u00b7 Pipe and tube \u00b7 Forgings. All forms are supplied to order.<\/div>\n<\/div>\n
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Standards<\/div>\n
THERE IS NO AMS. ASTM: A182 \/ SA-182 \u2014 GRADE F53 (forged flanges and fittings) \u00b7 A240 \/ SA-240 (plate, sheet and strip) \u00b7 A479 \/ SA-479 (bar and shapes) \u00b7 A789 \/ SA-789 (tube) \u00b7 A790 \/ SA-790 (pipe) \u00b7 A815 \/ SA-815 (wrought fittings) \u00b7 A276 \/ SA-276 (cited in the Rolled Alloys specification list). EN: 1.4410 \u00b7 10088-2 \u00b7 10088-3. NORSOK MDS D57 \u00b7 NORSOK M-650 \u00b7 NACE MR0175 \/ ISO 15156 \u00b7 API 6A (Langley Alloys). ASME Section IX welding group P-No 10H (Rolled Alloys, Langley Alloys).
‘F53’ IS a genuine ASTM A182 forging class code, not an alloy name. The duplex class list of ASTM A182 is: F50 = S31200, F51 = S31803, F52 = S32950, F53 = S32750, F54 = S39274, F55 = S32760, F57 = S39277, F59 = S32520, F60 = S32205, F61 = S32550, F65 =\u2026<\/span><\/div>\n<\/div>\n
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Advantage<\/div>\n
Of the five grades this one carries the highest ASTM A240 tensile minimum: 795 MPa (116 ksi). In the same table S32550 is 760 MPa, S32760 750 MPa, S32205 655 MPa and S32900 620 MPa. Its yield minimum of 550 MPa equals that of the other two super duplex grades.<\/div>\n<\/div>\n
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Welding<\/div>\n
FILLER METAL: AWS E2594 \/ ER2594 (Rolled Alloys: ‘2507 is welded using E2594 or ER2594 filler metal’). Sandmeyer and Penn Stainless describe the same job as ‘2507\/P100 filler metal is suggested when welding 2507 because it will produce the appropriate duplex weld structure’.<\/div>\n<\/div>\n
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Limits<\/div>\n
THE TEMPERATURE CEILING is about 270-315 \u00b0C; the reason is 475 \u00b0C embrittlement. Each with its source: Sandmeyer ‘not recommended for applications which require long exposures to temperatures above 570 \u00b0F because of the risk of a reduction in toughness’ (299 \u00b0C) \u00b7 Rolled Alloys ‘2507 should be limited to applications below 600 \u00b0F’ (316\u2026<\/div>\n<\/div>\n
REQUEST A QUOTE<\/a>All stainless 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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