{"id":3649,"date":"2026-09-16T11:13:25","date_gmt":"2026-09-16T08:13:25","guid":{"rendered":"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-415\/"},"modified":"2026-09-25T21:15:25","modified_gmt":"2026-09-25T18:15:25","slug":"aisi-415","status":"publish","type":"page","link":"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-415\/","title":{"rendered":"AISI 415 \/ (1.4313)"},"content":{"rendered":"

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AISI 415 \/ (1.4313) \/ UNS S41500<\/h1>\n
DEFENCE METAL<\/span><\/p>\n
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AISI 415<\/div>\n
UNS S41500 \u00b7 W.Nr. 1.4313 \u00b7 X3CrNiMo13-4 \u00b7 ASTM F6NM \u00b7 cast counterpart CA6NM (UNS J91540). This is a LOW-CARBON (SOFT) 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 \/ H1075 type ageing step. Two numbers separate this grade from 410 and 420: the CARBON CEILING OF 0.05% (0.15% in 410, 0.50% in 420C) and the NICKEL CONTENT OF 3.5-5.5% (0.75% max in 410). The low carbon gives toughness and weldability; the nickel is what makes the structure transform fully to martensite in spite of that low carbon – which is why the name is ‘soft martensitic’ and not ‘mild steel’. THE EN AND ASTM BANDS ARE NOT THE SAME: EN 10088-3 gives, for 1.4313, C 0.05% max – Si 0.70% max – Mn 1.50% max – P 0.040% max – S 0.015% max – Cr 12.0-14.0% – Ni 3.5-4.5% – Mo 0.30-0.70% – N 0.020% min. ASTM A182 F6NM \/ A240 S41500 give C 0.05% max – Mn 0.50-1.00% – Si 0.60% max – P 0.030% max – S 0.030% max – Cr 11.5-14.0% – Ni 3.5-5.5% – Mo 0.50-1.00%. The nickel ceiling (4.5 against 5.5), the molybdenum floor (0.30 against 0.50) and the chromium floor (12.0 against 11.5) differ; writing only ‘415’ on an order does not decide which band arrives.<\/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 parts that need weldability, low-temperature toughness and a 620 MPa yield floor AT THE SAME TIME: hydraulic turbine runners and blades, pump and compressor parts, valve bodies and stems, forged flanges and fittings for pressure service (ASTM A182 F6NM), hydraulic and power generation\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: NO AMS number could be verified against four independent sources; this grade is ordered through ASTM and EN, not through the aerospace AMS system. ASTM: A182 \/ SA-182 Grade F6NM (forged flanges, fittings and valve parts). EN: 1.4313 \u00b7 EN 10088-3 (bars, wire, sections) \u00b7 EN 10250-4 (open die forgings) \u00b7 EN 10272 (bolting steel for pressure purposes). Cast counterpart: CA6NM \/ UNS J91540.
THERE IS NO AMS: 410 has AMS 5613 \/ 5504 \/ 5591, 431 has AMS 5628 and 440C has AMS 5630 \/ 5618 \/ 5880; no AMS number for S41500 could be verified in the same way.<\/span><\/div>\n<\/div>\n
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Advantage<\/div>\n
Of these five martensitic grades, this is the ONLY ONE FOR WHICH IMPACT TOUGHNESS CAN BE ORDERED AGAINST THE SPECIFICATION. In numbers: ASTM A182 F6NM requires a minimum of 790 MPa tensile, 620 MPa yield, 15% elongation, 45% reduction of area and a maximum of 295 HBW.<\/div>\n<\/div>\n
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Welding<\/div>\n
IT IS WELDABLE – that is the reason this grade exists. Filler metal: AWS A5.9 ER410NiMo (TIG\/MIG) or AWS A5.4 E410NiMo (covered electrode);<\/div>\n<\/div>\n
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Limits<\/div>\n
1) THE Ac1 CEILING BINDS HARDER THAN THE FORBIDDEN TEMPERING BAND. In 410 \/ 420 \/ 431 \/ 440C the problem is tempering inside the 400-600 \u00b0C band; in 1.4313 the 520-620 \u00b0C band IS THE NORMAL SERVICE BAND (520-580 \u00b0C for +QT900, 550-600 \u00b0C for +QT780).<\/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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