{"id":3655,"date":"2026-09-16T11:14:31","date_gmt":"2026-09-16T08:14:31","guid":{"rendered":"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-314\/"},"modified":"2026-09-25T21:15:27","modified_gmt":"2026-09-25T18:15:27","slug":"aisi-314","status":"publish","type":"page","link":"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-314\/","title":{"rendered":"AISI 314 \/ (1.4841)"},"content":{"rendered":"

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AISI 314 \/ (1.4841) \/ AMS 5522 \/ AMS 5652<\/h1>\n
DEFENCE METAL<\/span><\/p>\n
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AISI 314<\/div>\n
UNS S31400 \u00b7 W.Nr. 1.4841 \u00b7 X15CrNiSi25-21 \u00b7 the ASTM A276 band: C \u2264 0.25%, Mn \u2264 2.00%, P \u2264 0.045%, S \u2264 0.030%, Si 1.50-3.00%, Cr 23.00-26.00%, Ni 19.00-22.00%. The EN 1.4841 band: C \u2264 0.20%, Si 1.50-2.50%, Mn \u2264 2.00%, P \u2264 0.045%, S \u2264 0.015%, Cr 24.0-26.0%, Ni 19.0-22.0%, N \u2264 0.11%. THE TWO BANDS ARE NOT THE SAME: the ASTM silicon ceiling is 3.00% and the EN one 2.50%; the ASTM carbon ceiling is 0.25% and the EN one 0.20%; the ASTM lower chromium limit is 23.00% and the EN one 24.0%. One heat may not satisfy both, and S31400 and 1.4841 do not automatically stand in for one another. What defines 314 is THAT THE SILICON HAS A LOWER LIMIT: a minimum of 1.50% is required, so the silicon ceiling of 310 is the silicon floor of 314. It is an austenitic stainless steel: NOT PRECIPITATION HARDENABLE.<\/p>\n
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Not to be confused with<\/div>\n

AISI 310<\/a><\/div>\n<\/div>\n<\/div>\n

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For what<\/div>\n
Bought when resistance to scaling in air is wanted at a temperature where 310 is not enough: radiant tubes, furnace internals and enclosures, heat-treatment baskets and fixtures, annealing and carburizing boxes.<\/div>\n<\/div>\n
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Forms<\/div>\n
Round bar \u00b7 flat bar \u00b7 plate \u00b7 sheet \u00b7 pipe \u00b7 forging \u00b7 wire. All forms are supplied to order. NOTE: as set out in the standards note below, there is NO ASTM equivalent for 314 on the plate, sheet, pipe and tube side; those forms are ordered to EN 10095 \/ 1.4841 or to AMS 5522.<\/div>\n<\/div>\n
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Standards<\/div>\n
AMS: 5522 (sheet, strip and plate \u2014 the SAE title reads ’25Cr-20Ni-2.0Si (314), Solution Heat Treated’) \u00b7 5652 (bars, forgings and rings \u2014 the SAE title reads ’25Cr-20Ni-2Si’). ASTM: A276 (bars and shapes) \u00b7 A314 (billets and bars for forging) \u00b7 A473 (forgings) \u00b7 A580 (wire). THERE IS NO OTHER ASTM SPECIFICATION. EN: 1.4841 \u00b7 EN 10095 (heat resisting steels) \u2014 this is the governing standard for plate, sheet, bar and tube. Others: JIS SUH 310 (approximate equivalent) \u00b7 BS 314S25 \u00b7 UNI X16CrNiSi25-20.
THE MOST IMPORTANT NOTE \u2014 THE ASTM SCOPE OF 314 EXISTS ONLY ON THE BAR AND FORGING SIDE. The SSINA handbook lists only four ASTM numbers for S31400: A276, A314, A473, A580.<\/span><\/div>\n<\/div>\n
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Advantage<\/div>\n
+100 \u00b0C in air. In ONE AND THE SAME EN 10095 table the maximum service temperature in air is 1150 \u00b0C for 1.4841 and 1050 \u00b0C for 1.4845 (310S).<\/div>\n<\/div>\n
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Welding<\/div>\n
Filler metal, preheat and post-weld treatment information SPECIFIC to 314 could not be confirmed by four independent sources, and for that reason no numbers are given.<\/div>\n<\/div>\n
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Limits<\/div>\n
1) SULPHUR-BEARING ATMOSPHERES \u2014 THIS IS THE HARDEST LIMIT. AGST: resistance to oxidising and reducing sulphurous gases holds up to about 650 \u00b0C. thyssenkrupp: ‘the resistance to oxidising and reductive sulphurous gases is low.’ Virgamet: at high sulphur concentrations the heat resistance drops to approximately 900 \u00b0C.<\/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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