{"id":3657,"date":"2026-09-16T11:14:37","date_gmt":"2026-09-16T08:14:37","guid":{"rendered":"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-310\/"},"modified":"2026-09-25T21:15:30","modified_gmt":"2026-09-25T18:15:30","slug":"aisi-310","status":"publish","type":"page","link":"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-310\/","title":{"rendered":"AISI 310 \/ (1.4845)"},"content":{"rendered":"

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AISI 310 \/ (1.4845) \/ UNS S31000 \/ AMS 5521 \/ AMS 5572<\/h1>\n
DEFENCE METAL<\/span><\/p>\n
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AISI 310 \/ 310S<\/div>\n
UNS S31000 (310) and UNS S31008 (310S) \u00b7 W.Nr. 1.4845 \u00b7 X8CrNi25-21 \u00b7 24.0-26.0% Cr \u2013 19.0-22.0% Ni \u2013 Si \u2264 1.50% \u2013 balance Fe. THE ONLY SPECIFICATION DIFFERENCE BETWEEN 310 AND 310S IS CARBON: in ASTM A276, C \u2264 0.25% for 310 and C \u2264 0.08% for 310S. The chromium, nickel and silicon bands are THE SAME. The EN 1.4845 band is: C \u2264 0.10%, Si \u2264 1.50%, 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% \u2014 so as far as the carbon ceiling goes, 1.4845 corresponds to 310S, not to 310. It is an austenitic stainless steel: NOT PRECIPITATION HARDENABLE, it cannot be hardened by heat treatment; strength is raised only by cold work.<\/p>\n
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Not to be confused with<\/div>\n

AISI 314<\/a><\/div>\n<\/div>\n<\/div>\n

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For what<\/div>\n
Bought for parts that must resist scaling in air at high temperature: furnace internals, radiant tubes, heat-treatment baskets and fixtures, calcining kiln parts, flue and fluidised-bed combustor components.<\/div>\n<\/div>\n
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Forms<\/div>\n
Round bar \u00b7 flat bar \u00b7 plate \u00b7 sheet \u00b7 seamless and welded pipe \u00b7 boiler and heat-exchanger tube \u00b7 forging \u00b7 fitting \u00b7 flange \u00b7 wire \u00b7 welding consumables. All forms are supplied to order.<\/div>\n<\/div>\n
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Standards<\/div>\n
AMS: 5521 (sheet, strip, plate) \u00b7 5651 (bar, wire, forging) \u00b7 5572 (seamless tube) \u00b7 5577 (welded tube). ASTM: A240 \/ SA-240 (plate, sheet, strip \u2014 S31008 ONLY) \u00b7 A276 (bars and shapes \u2014 both S31000 and S31008) \u00b7 A479 \/ SA-479 (bar for boilers and pressure vessels \u2014 S31008 ONLY) \u00b7 A312 \/ SA-312 (seamless and welded pipe \u2014 TP310S) \u00b7 A213 \/ SA-213 (seamless boiler tube \u2014 TP310S) \u00b7 A249 \/ SA-249 (welded tube \u2014 TP310S) \u00b7 A358 (welded high-temperature pipe) \u00b7 A182 \/ SA-182 (F310 forged flanges and fittings) \u00b7 A314 (billets and bars for forging) \u00b7 A473 (forgings) \u00b7 A580 (wire) \u00b7 A484 (general requirements). EN: 1.4845 \u00b7 EN 10095 (heat resisting steels) \u00b7 EN 10088-2 \u00b7 EN 10088-3 \u00b7 EN 10216-5 \u00b7 EN 10222-5.
THE MOST IMPORTANT NOTE \u2014 THE SPECIFICATION SCOPE OF S31000 AND S31008 IS NOT THE SAME. In both of the separate ASTM A240 texts searched, S31008 IS PRESENT and S31000 IS NOT. In the ASTM A479 text S31008 is present and S31000 is not.<\/span><\/div>\n<\/div>\n
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Advantage<\/div>\n
Resistance to scaling in air. In the EN 10095 table the maximum service temperature in air for 1.4845 is 1050 \u00b0C; that is far above grades of the 1.4541 (321) and 1.4301 (304) class in the same table, and it is bought by raising the chromium to 24-26% and the nickel to 19-22%.<\/div>\n<\/div>\n
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Welding<\/div>\n
FILLER METAL: E310-15 covered electrode (AWS A5.4 \/ SFA-5.4) and ER310 bare wire (AWS A5.9 \/ SFA-5.9); materialwelding gives SFA-5.22 E310T-X for cored wire.<\/div>\n<\/div>\n
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Limits<\/div>\n
1) SIGMA PHASE: the alloy precipitates sigma in the 650-950 \u00b0C band (Sandmeyer). Sigma is hard and brittle; it lowers toughness, and after a long hold in that band the material can crack during welding. The remedy is a solution anneal.<\/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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