{"id":3645,"date":"2026-09-16T11:13:11","date_gmt":"2026-09-16T08:13:11","guid":{"rendered":"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-416\/"},"modified":"2026-09-25T21:15:22","modified_gmt":"2026-09-25T18:15:22","slug":"aisi-416","status":"publish","type":"page","link":"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-416\/","title":{"rendered":"AISI 416 \/ (1.4005)"},"content":{"rendered":"

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AISI 416 \/ (1.4005) \/ UNS S41600 \/ AMS 5610<\/h1>\n
DEFENCE METAL<\/span><\/p>\n
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AISI 416<\/div>\n
UNS S41600 \u00b7 W.Nr. 1.4005 \u00b7 X12CrS13. This is a MARTENSITIC stainless steel: it transforms to martensite on austenitising and quenching and is then TEMPERED. It does NOT precipitation harden; there is NO H900 \/ H1025 type ageing step. This grade is 410 WITH SULFUR ADDED, and sulfur is the only thing that sets the two apart. EN 10088-3 for 1.4005: C 0.06-0.15% – Si 1.00% max – Mn 1.50% max – P 0.040% max – S 0.15-0.35% – Cr 12.0-14.0% – Mo 0.60% max – balance Fe. ASTM A582 \/ the Carpenter type analysis: C 0.15% max (THERE IS NO FLOOR) – Mn 1.25% max – P 0.060% max – S 0.150% min – Si 1.00% max – Cr 12.00-14.00% – balance Fe; Swiss Steel adds Cu 0.50% max, and Rolled Alloys and Swiss Steel give Mo 0.60% max. THE DIFFERENCES MATTER: EN sets a carbon FLOOR (0.06%) and a sulfur CEILING (0.35%), ASTM sets neither; the ASTM phosphorus ceiling is 0.060% against 0.040% in EN; the manganese ceiling is 1.25% in ASTM and 1.50% in EN.<\/p>\n
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Not to be confused with<\/div>\n

AISI 410<\/a><\/div>\n<\/div>\n<\/div>\n

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For what<\/div>\n
Bought for volume-machined parts where machining cost governs, the environment is mild and the part is NOT WELDED: automatic screw machine parts, shafts, axles, gears, bolts and nuts, valve trim, pump shafts, lead screws, solenoid valve cores (Zapp), firearm parts and golf club heads (Carpenter).<\/div>\n<\/div>\n
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Forms<\/div>\n
Round bar, flat bar, plate, sheet, pipe, forging. All forms are supplied to order.<\/div>\n<\/div>\n
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Standards<\/div>\n
AMS: 5610 – ‘Steel, Corrosion and Heat-Resistant, Bars, Wire, and Forgings 12.5Cr – Low Carbon (SAE 51416, 51416Se) Free-Machining’. ASTM: A582 \/ A582M (free-machining stainless bars). EN: 1.4005 \u00b7 EN 10088-3 (bars, wire, sections; +A and +QT650 conditions). Welding procedure: ASME Section IX P-No 6 (although this grade is not welded in practice).
THE AMS 5610 TRAP: this number DOES NOT BELONG TO A SINGLE ALLOY. Its title names both SAE 51416 (the sulfur-bearing 416) and SAE 51416Se (the selenium-bearing 416Se), and the specification separates them as TYPES.<\/span><\/div>\n<\/div>\n
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Advantage<\/div>\n
THE BEST MACHINABILITY OF ANY STAINLESS STEEL sits in this grade, and it comes together with the ability to be hardened by heat treatment. In numbers: AZoM gives a machinability rating of 85% and calls it the highest of all stainless steels;<\/div>\n<\/div>\n
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Welding<\/div>\n
IT IS NOT SUITABLE FOR WELDING. Five independent sources say the same thing: Carpenter states it is ‘not recommended for welding’; Rolled Alloys states that ‘typically free-machining grades are not welded due to problems stemming from the free-machining additives’;<\/div>\n<\/div>\n
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Limits<\/div>\n
1) IT IS NOT WELDED (five sources above). 2) ITS CORROSION RESISTANCE IS LOWER THAN THAT OF 410. The cause is the same sulfur: MnS inclusions act as pit initiation sites in the passive layer.<\/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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