4130 Steel
SAE 4130 is a low-alloy, medium-carbon steel renowned for its balance of strength, toughness, and weldability. Its alloying with chromium and molybdenum provides improved hardenability and fatigue resistance, making it a preferred choice for structural, automotive, aerospace, oil & gas, and tooling applications.
grades designations
SAE 4130 steel is available in a variety of forms including coil, strip, and plate. Typical mechanical properties in the normalized condition include a minimum yield strength around 460 MPa (67 ksi), but in quenched and tempered states higher values can be achieved depending on section size and tempering practice.
Grade 4130 Mechanical and Physical Properties
Property
specification
Weldability
4130 offers good weldability compared to many higher‐alloy steels due to its moderate carbon content and alloying levels.
Thermal Cutting
Edge hardening and microstructural changes should be managed with appropriate heat input and cooling practice to avoid brittleness and cracking.
Bendability
4130 exhibits good formability and bendability for structural and fabrication uses when annealed or normalized.
Ease of Fabrication
4130 is machinable when annealed.
