4130 Steel Properties

In this blog post, we will delve into the world of 4130 steel, exploring its remarkable properties, exceptional strength, and diverse range of applications. Whether you’re a metallurgy enthusiast or simply curious about this alloy, join us as we uncover the secrets behind the popularity and versatility of 4130 steel.

Understanding 4130 Steel

4130 steel is a chromium-molybdenum alloy renowned for its outstanding strength-to-weight ratio. It is often referred to as “chromoly” due to its chromium and molybdenum content. This alloy exhibits excellent weldability, making it a preferred choice for various industries.

Properties of 4130 Steel

One of the key characteristics of 4130 steel is its exceptional strength. With a tensile strength of approximately 97,000 psi, this alloy offers remarkable durability and resistance to wear and tear. Additionally, it boasts excellent toughness, making it suitable for applications that require high impact resistance.

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4130 Steel Chemical Compositions

The chemical composition of 4130 steel, also known as AISI 4130 or SAE 4130, is as follows:

  • Carbon (C): 0.28-0.33%
  • Chromium (Cr): 0.80-1.10%
  • Manganese (Mn): 0.40-0.60%
  • Phosphorus (P): 0.035% max
  • Sulfur (S): 0.040% max
  • Silicon (Si): 0.15-0.35%
  • Molybdenum (Mo): 0.15-0.25%
ElementComposition Range (% by weight)
Carbon (C)0.28 – 0.33
Chromium (Cr)0.80 – 1.10
Manganese (Mn)0.40 – 0.60
Silicon (Si)0.15 – 0.35
Phosphorus (P)0.035 (max)
Sulfur (S)0.040 (max)
Molybdenum (Mo)0.15 – 0.25
Iron (Fe)Remaining balance
Mechanical PropertyValue
Tensile Strength85,000 – 120,000 psi
Yield Strength70,000 – 85,000 psi
Elongation at Break20 – 30%
Hardness (Rockwell C Scale)20 – 30 HRC (as quenched)
Impact Toughness (Charpy V-Notch)27 – 54 ft-lb

4130 Steel Mechanical Properties

4130 steel is a low-alloy steel that is commonly used in various industries due to its excellent strength and toughness properties. Here are the mechanical properties of 4130 steel:

  1. Tensile Strength: The tensile strength of 4130 steel typically ranges from 560 MPa (81,200 psi) to 760 MPa (110,200 psi). This high tensile strength makes it suitable for applications that require strong and durable materials.
  2. Yield Strength: The yield strength of 4130 steel is around 460 MPa (66,700 psi). Yield strength is the maximum stress that a material can withstand without permanent deformation or failure.
  3. Elongation: 4130 steel exhibits a relatively high elongation of approximately 20% to 30%. Elongation represents the ability of a material to deform before fracturing and is an important property for applications that require ductility.
  4. Hardness: The hardness of 4130 steel can vary depending on the heat treatment applied. In its annealed condition, the hardness typically ranges from 156 to 217 Brinell hardness (BHN). After heat treatment, the hardness can increase to a range of 248 to 302 BHN.
  5. Impact Toughness: 4130 steel has good impact toughness, which means it can absorb energy without fracturing. This property is crucial for applications that involve high-stress impacts or sudden loads.
  6. Fatigue Strength: 4130 steel has excellent fatigue strength, making it suitable for applications subjected to cyclic loading or repeated stress.
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Versatile Applications

The versatility of 4130 steel is truly remarkable. It finds extensive use in industries such as aerospace, automotive, oil and gas, and even in the manufacturing of bicycles. In the aerospace sector, this alloy is commonly employed in the construction of aircraft components, including landing gears and structural parts.

In the automotive industry, 4130 steel is utilized in the fabrication of roll cages, chassis, and suspension components, owing to its exceptional strength and weldability.

Strength and Weldability

4130 steel’s strength and weldability make it a preferred choice for various applications. Its weldability allows for easy joining of components, enabling manufacturers to create complex structures without compromising on strength.

This attribute, combined with its exceptional strength, makes 4130 steel an ideal material for constructing high-performance machinery and equipment.

Heat Treatment and Machinability

4130 steel can be heat-treated to enhance its mechanical properties. Through processes such as annealing, normalizing, or quenching and tempering, the alloy’s hardness, strength, and ductility can be tailored to meet specific requirements. Furthermore, 4130 steel exhibits good machinability, allowing for efficient shaping and fabrication processes.

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