Steel is the backbone of modern industry, and among the numerous steel grades available, 4140 steel stands out due to its excellent properties and versatile applications. If you’re looking to dive deep into the world of 4140 alloy steel, you’re in the right place. Whether you’re an engineer, a manufacturer, or simply someone interested in high-performance materials, this comprehensive may will help you understand why 4140 might be the perfect choice for your next project.

What is 4140 ?

4140 steel is a chromium-molybdenum alloy steel known for its toughness, high fatigue strength, and abrasion and impact resistance. It is widely used in the manufacturing of various industrial components due to its excellent mechanical properties and versatility. It’s often referred to as “Chromoly” steel, thanks to its two main alloying elements: chromium and molybdenum.

Chemical Composition of 4140 alloy Steel

Element Content (%)
Carbon (C) 0.38-0.43
Chromium (Cr) 0.80-1.10
Manganese (Mn) 0.75-1.00
Molybdenum (Mo) 0.15-0.25
Silicon (Si) 0.15-0.30
Sulfur (S) 0.040 max
Phosphorus (P) 0.035 max

SAE AISI 4140-round-bar

Mechanical Properties of 4140 

Property Value
Tensile Strength 655 MPa (min)
Yield Strength 415 MPa (min)
Elongation 20% (in 50mm)
Hardness (Brinell) 197 – 237 HB

 

Comparison with Other Steel Grades

Property 4140 Steel 1045 Steel 4340 Steel
Tensile Strength 655 MPa 570 MPa 745 MPa
Yield Strength 415 MPa 310 MPa 470 MPa
Hardness (Brinell) 197 – 237 HB 170 – 210 HB 217 – 248 HB
Toughness High Moderate Very High
Heat Treatability Excellent Limited Excellent

 

Conclusion

4140 steel is a versatile, high-performance alloy steel that offers exceptional strength, toughness, and wear resistance. Its ability to be heat treated, machined, and formed into various shapes makes it a popular choice across multiple industries. If you have any questions or need further assistance, don’t hesitate to contact us.

Dongguan Otai Special Steel by email at [email protected]

WhatsApp at +8613642825398.