Alloy AISI 4140 Steel Suppliers (UNS G41400)

4140 Alloy Steel Available Products

Carbon Steel Bar Package, 4140 Steel Suppliers
  • Round Bar
  • Flat Bar
  • Square Bar
  • Hexagon Bar
  • Plate
  • Strip

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Table of Contents

What is 4140 Steel?

AISI or SAE 4140 grade is considered a low alloy or carbon steel. Added chromium and molybdenum, it is one of the most common alloy steels. Chromium increases corrosion resistance and molybdenum increases toughness.

4140 Carbon Steel Data Sheet

4140 Steel Chemical Composition

C0.38 – 0.43
Cr0.8 – 1.1
Fe96.785 – 97.84
Mn0.7 – 1
Mo0.15 – 0.25
P0.035 max
S0.04 max
Si0.15 – 0.3

4140 Carbon Steel Physical Properties

The physical properties of AISI 4140 alloy steel are highlighted in the following table.

Density7.85 g/cm30.284 lb/in³
Melting point1416°C2580°F

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4140 Carbon Steel Mechanical Properties

The following table outlines the mechanical properties of AISI 4140  carbon steel.

Tensile strength655 MPa95000 psi
Yield strength415 MPa60200 psi
Bulk modulus (typical for steel)140 GPa20300 ksi
Shear modulus (typical for steel)80 GPa11600 ksi
Elastic modulus190-210 GPa27557-30458 ksi
Poisson’s ratio0.27-0.300.27-0.30
Elongation at break (in 50 mm)25.70%25.70%
Hardness, Brinell197197
Hardness, Knoop (converted from Brinell hardness)219219
Hardness, Rockwell B (converted from Brinell hardness)9292
Hardness, Rockwell C (converted from Brinell hardness. Value below normal HRC range, for comparison purposes only)1313
Hardness, Vickers (converted from Brinell hardness)207207
Machinability (based on AISI 1212 as 100 machinability)6565

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Equivalents of 4140 Alloy Steel

Country StandardEquivalent Grade
China GB/T 3077
Germany DIN 17200
1.7225/ 42crmo4
Great Britain BS 970
Japan JIS G4105

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Advantages of 4140 Alloy Steel

4140 alloy steel offers several advantages that make it a popular choice in various applications:

1. High Strength: 4140 alloy steel has excellent tensile strength, making it suitable for heavy-duty applications in industries such as aerospace, automotive, and construction.

2. Hardness: It can be heat-treated to achieve high hardness levels, providing exceptional wear resistance and durability, especially in demanding conditions.

3. Versatility: 4140-grade steel is highly versatile, and it can be used in a wide range of applications, including gears, shafts, bolts, nuts, and machinery components.

4. Machinability: Despite its high strength and hardness, 4140 steel can be machined relatively easily when compared to other high-strength steel, which makes it more cost-effective for manufacturers.

5. Toughness: It exhibits good toughness, which means it can withstand impact and shock loading without fracturing easily.

6. Fatigue Resistance: 4140 alloy steel shows good resistance to fatigue, allowing it to endure repeated stress cycles without failure, making it suitable for components subjected to cyclic loading.

7. Weldability: With proper preheat and post-weld heat treatment, 4140 steel can be welded, although it may require careful consideration due to its high carbon content.

8. Affordability: 4140 carbon steel offers an excellent balance between performance and cost, making it a cost-effective choice for many applications.

9. Availability: It is widely available in various forms, such as bars, plates, and tubes, making it easily accessible for manufacturers and fabricators.

Due to these advantages, 4140 alloy steel is commonly used in the manufacturing of machinery, automotive parts, oil and gas equipment, industrial tools, and many other applications where high strength, hardness, and toughness are required.

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Applications of 4140 Alloy Steel

  • Fixtures
  • Axis
  • Crankshaft
  • Gear
  • Fixture
  • Nuts and Bolts
  • Collar
  • Milling Spindle
  • Steel Conveyors and Rollers
  • Steel Coupling
  • Injector
  • Piston rod
  • Mechanical Parts
  • More!











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Why choose Huaxiao Metal 4140 Steel Suppliers?

4140 cold-finished annealed steel has many beneficial properties that make it ideal for a variety of industries and applications. At Huaxiao Metals, our network of mills, fabricators, and material suppliers enables us to provide high-quality steel that best suits your needs.

Carbon Steel Bar Package
 4140 Carbon Steel Bar Package

We are proud to serve a variety of industries and we will work with you to find the right material for your job requirements. For more information, or to learn more about 4140 Cold Finish Annealing, contact us today or request the 4140 steel price.

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4140 Steel Related Requestions

Yes, 4140 is considered a type of tool steel. It is often classified as an alloy steel, specifically falling into the category of tool steels due to its excellent strength, hardness, and wear resistance properties. Tool steels are commonly used in the manufacturing of tools, dies, molds, and other applications where high toughness and wear resistance are required. 4140 steel’s properties make it suitable for a wide range of tooling and machinery applications.

Yes, 4140 is considered a type of carbon steel. It is an alloy steel that contains carbon as one of its primary alloying elements, along with other elements like chromium, manganese, and molybdenum. The carbon content in 4140 steel typically ranges from 0.38% to 0.43%. Therefore, it is a type of carbon steel with enhanced properties due to the addition of alloying elements.

Yes, 4140 steel can rust if it is exposed to moisture or corrosive environments. It is not a stainless steel and does not have the same level of corrosion resistance as stainless steel alloys. To prevent rusting, proper maintenance and protective coatings are necessary, especially in environments with high humidity or exposure to water.

Yes, 4140 steel is magnetic. Like most carbon steels, it exhibits magnetic properties. The magnetic behavior is a result of the iron atoms’ alignment in the crystal lattice structure of the steel. This magnetic property makes it easy to distinguish and identify 4140 steel using simple magnetic tests or magnetic tools.

4140 steel can vary in hardness depending on the heat treatment it has undergone. In its annealed or normalized condition, it typically has a hardness of around 150-180 Brinell (HB). After heat treatment, such as quenching and tempering, it can achieve much higher hardness levels, ranging from approximately 28-35 HRC (Rockwell Hardness). The exact hardness will depend on the specific heat treatment process and the desired properties for the application.

No, 4140 is not considered high-carbon steel. It is an alloy steel or low-carbon steel with a carbon content of 0.38% to 0.43%, which is relatively low compared to high-carbon steel. High-carbon steel usually has a higher carbon content, usually higher than 0.60% to 1.00%, or even higher. 4140 is known for its excellent strength, hardness, and toughness, but it is not a high-carbon steel.

Yes, 4140 steel can be welded to mild steel. However, it is important to consider the differences in composition and properties of the two materials during the welding process. Preheat and post-weld heat treatment may be required to prevent cracking and ensure proper joint strength. Additionally, the selection of the proper welding method and filler material is critical to achieving a successful weld between 4140 steel and mild steel.

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