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AISI 4140 special / modified steel

AISI 4140 SS is a versatile quenched and tempered steel characterized by its high toughness and strength.

AISI 4140 is mainly used in mechanical engineering, as well as in vehicle and automotive construction. For example, gears, gear and crankshafts and connecting rods are made from this steel 4140.

AISI 4140 Special Steel

International identifiers

ASTM A331, A505, A519, A646, AFNOR 42C04, 42CD4U, SS2244, AFNOR 40CDU, 40CD4U, B.S. 708A42, 708H37, 708M40, 709M40, EN19, EN19A, EN19B, EN19C, 40HM, 1.7225

Chemical composition

AISI 4140
C Si Mn P S Cr Mo Ni V
min. 0.38 0.60 0.90 0.15 0.5
max. 0.45 0.40 0.90 0.025 0.035 1.20 0.30 0.7


The quenched and tempered material AISI 4140 modified steel is very difficult to weld and is not suitable for welded constructions. Heat treatment is recommended if welding is unavoidable.

Steel from stock

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Special steel quick delivery from stock

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Special steel from stock

From stock in US

Specialist for sawn steel blocks directly from stock

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Karol Borycki
Phone: +1 409 2395919

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