4140 Steel: Round Bar and Flat Bar Available

Sae 4140 is a highly versatile alloy steel that falls under the category of chromium-molybdenum steels. It is well-known for its outstanding mechanical properties, including high strength, toughness, and wear resistance, which make it an excellent option for a range of demanding applications. This alloy steel is especially prized in industries like automotive, aerospace, and manufacturing, where components face significant stress and require durability and reliability.

The distinctive blend of chromium and molybdenum in Sae 4140 boosts its hardenability and strength, enabling it to be heat-treated for specific mechanical properties suited to various uses. Its capability to perform well under extreme conditions has established it as a go-to material for essential components such as gears, axles, and crankshafts.

In this article, we will delve into the chemical composition, material properties, applications, and equivalent materials of Sae 4140, offering a thorough overview of why this alloy steel is a favored choice in the engineering and manufacturing fields.

Chemical Composition of Sae 4140

• Carbon (C): 0.380 - 0.430%

• 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%

• Phosphorous (P): ≤ 0.035%

• Iron (Fe): Balance

Material Properties of Sae 4140

• Density: 7.85 g/cm³ (0.284 lb/in³)

• Melting Point: 1416°C (2580°F)

• Tensile Strength: 655 MPa (95000 psi)

• Yield Strength: 415 MPa (60200 psi)

• Elongation at Break: 25.70%

• Hardness (Brinell): 197

• Machinability: 65% (based on AISI 1212 as 100 machinability)

Applications of Sae 4140

• Automotive Components: Axles, crankshafts, drive shafts, and gears.

• Industrial Machinery: Tool holders, molds, and machinery parts.

• Construction: Structural components, bolts, and pins.

• Oil and Gas: Drill collars and other high-stress applications.

Equivalent Materials to Sae 4140

• USA: ASTM A29/A29M

• Germany: DIN 17350 (42CrMo4)

• Japan: JIS G4404 (SCM440)

• China: GB/T 1229 (42CrMo)

• ISO: ISO 683/18 (42CrMo4)

In conclusion, the combination of strength, durability, and versatility in AISI 4140 makes it a vital material in contemporary manufacturing and engineering, ensuring its continued importance in the creation of advanced components and systems for the foreseeable future.

RN Gupta and Bros is a leading steel trading company with a proud history spanning over 50 years in the industry, serving more than 500 clients across India. Our vast experience and dedication to quality make us a reliable partner for all your steel requirements. If you need Sae 4140 steel or any other type of steel, don't hesitate to contact us. We are committed to delivering outstanding service and ensuring that your needs are addressed with precision and care. Let us take care of the details while you concentrate on your business!