AISI 4340 Steel Round Bar Sheet Plate, JIS SNCM439, DIN 1.6563

4340 steel is nickel-chromium-molybdenum  alloy steel . It will get high strength after the heat treat. And it has good toughness, fatigue resistance, impact toughness and etc. 4340 steel round bar sheet plate will get high tensile strength, hardness and toughness after heat treatment. It is used widely in the transmission components of heavy chemical machinery. Different sections of each part of the casting which cause the temperature difference stress and phase transformation stress.
Its equivalent grade is JIS SNCM439 and DIN 1.6563. The properties and composition of 4340 steel round bar sheet plate  as below.

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4340 Steel Grade Equivalent Chart

Country USA Germany/UK/France JAPAN ISO
Standard ASTM A29 / A29M-05 EN 10263/4-2001 JIS G4053-2008 ISO 683/18-1996
Grades 4340 41NiCrMo7-3-2, 1.6563 SNCM439 36CrNiMo4

4340 Steel Mechanical Properties

Properties Metric Imperial
Tensile strength >980 MPa 142140 psi
Yield strength >835 MPa 121110 psi
Elongation at break >12% >12%
Reduction of area >55% >55%
Hardness ≤269HB ≤269HB

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