{"id":3633,"date":"2026-09-16T11:11:09","date_gmt":"2026-09-16T08:11:09","guid":{"rendered":"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-430f\/"},"modified":"2026-09-25T21:15:06","modified_gmt":"2026-09-25T18:15:06","slug":"aisi-430f","status":"publish","type":"page","link":"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-430f\/","title":{"rendered":"AISI 430F \/ (1.4105)"},"content":{"rendered":"

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AISI 430F \/ (1.4105) \/ UNS S43020 \/ AMS 5503 \/ AMS 5627<\/h1>\n
DEFENCE METAL<\/span><\/p>\n
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AISI 430F<\/div>\n
UNS S43020 \u00b7 W.Nr. 1.4104 (X14CrMoS17) and 1.4105 (X6CrMoS17) \u00b7 ~17% Cr – a sulfur-bearing free-machining grade. This grade is 430 WITH SULFUR ADDED, and sulfur is the one thing that sets the two apart. ASTM S43020 (SSINA, BSSA, Penn Stainless): C 0.12% max (THERE IS NO FLOOR) – Mn 1.25% max – Si 1.00% max – P 0.060% max – S 0.15% min – Cr 16.0-18.0% – Mo 0.60% max – Ni 0.75% max (BSSA) – balance Fe. Penn Stainless gives the sulfur range as 0.15-0.60%. EN 10088-3 for 1.4104 (Rodacciai, Lucefin, DEW and ABRAMS give the same band – four independent sources): C 0.10-0.17% – Si 1.00% max – Mn 1.50% max – P 0.040% max – S 0.15-0.35% – Cr 15.5-17.5% – Mo 0.20-0.60% – balance Fe. A DIFFERENCE OF CLASS: AISI 430F (S43020) is FERRITIC and does not harden by heat treatment. 1.4104, written as its EN counterpart, carries a carbon floor of 0.10% and therefore sits in the MARTENSITIC class of EN 10088-3 and can be quenched and tempered; the Rodacciai sheet is headed ‘MARTENSITIC 430F’. The ferritic tables of worldstainless and BSSA, by contrast, match 430F with 1.4105 (X6CrMoS17, C 0.08% max).<\/p>\n
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Not to be confused with<\/div>\n

AISI 430<\/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. ABRAMS lists fasteners, bolts, screws, valves, shafts, kitchen utensils, architectural elements, automatic machining components for water and steam service and automotive and\u2026<\/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: NONE. The AMS column of the Type 430F (S43020) row in the SSINA type\/specification table is EMPTY. ASTM (the full list from the SSINA Type 430F row): A582 \/ A582M (hot-rolled or cold-finished free-machining bars – THE PRINCIPAL SPECIFICATION) \u00b7 A581 (free-machining wire and wire rods) \u00b7 A895 (free-machining plate, sheet and strip) \u00b7 A314 (billets and bars for forging) \u00b7 A473 (forgings) \u00b7 F593 \/ F594 \/ F738 \/ F836 (fasteners) \u00b7 F899 (billet, bar and wire for surgical instruments) \u00b7 F2281 (bolts for heat resistance). EN: 1.4104 (X14CrMoS17) and 1.4105 (X6CrMoS17) \u00b7 EN 10088-3 (long products). SAE type number: 51430F. Penn Stainless confirms A582 separately: ‘Properties of Grade 430F are specified for bar in ASTM A582’.
THERE ARE TWO TRAPS. (1) THE EQUIVALENCE TRAP – 1.4104 AND 1.4105 ARE NOT THE SAME MATERIAL, and both are written as the counterpart of 430F. Rodacciai publishes its 1.4104 sheet headed ‘MARTENSITIC 430F’;<\/span><\/div>\n<\/div>\n
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Advantage<\/div>\n
Machining speed. worldstainless describes 430F as ‘the free machining version of 430’ and states that it is ‘very much easier to machine’; ABRAMS rates machinability 6\/6 and states that the sulfur gives a fine ground surface finish; Lucefin rates machinability ‘high’;<\/div>\n<\/div>\n
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Welding<\/div>\n
IT IS NOT SUITABLE FOR WELDING. Four independent sources say the same thing: DEW states that ‘generally, Corrodur 4104 is not welded except by resistance or friction welding’;<\/div>\n<\/div>\n
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Limits<\/div>\n
1) IT IS NOT WELDED (four sources above). 2) ITS RESISTANCE IN CHLORIDE ENVIRONMENTS IS LOWER THAN THAT OF 430. BSSA states that free-machining grades show ‘lower pitting and crevice corrosion resistance in chloride environments’ and ‘inferior SCC, (stress corrosion cracking), and corrosion fatigue resistance’;<\/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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