ThePipingMart Blog Grades SAE/AISI 1140 Steel (UNS G11400) – Composition, Properties and Uses

SAE/AISI 1140 Steel (UNS G11400) – Composition, Properties and Uses

SAE / AISI 1140

SAE/AISI 1140 distinguishes itself as a high-strength, low-alloy steel, celebrated for its outstanding mechanical properties and impressive weldability. In the following discourse, we will intricately examine the specifics of UNS G11400, delving into its applications, advantages, and more. Keep reading to acquire a thorough understanding of this versatile alloy steel!

What is SAE / AISI 1140?

UNS G11400 is a high-strength, low-alloy steel. It contains Chromium, Molybdenum, and Manganese as strengthening agents. The carbon content is between 0.37 and 0.43 percent. This low carbon content means that the alloy can be easily welded. In addition, the alloy has good Machinability and Ductility properties. SAE/AISI 1140 steel, also known by its industrial designation UNS G11400, is a high-quality alloy widely used in various applications due to its outstanding composition and properties. This steel’s excellent Machinability and Weldability sets it apart, making it an ideal choice for manufacturing complex parts and components. With superior strength, toughness, and hardenability, AISI 1140 steel is known for its exceptional wear Resistance and Durability, making it a popular choice in the Construction, Automotive, and Industrial sectors. Whether you are looking for reliable steel for your next project or seeking to upgrade your existing equipment, 1140 Steel is a top contender for optimal performance and longevity.

What Forms of AISI 1140 is Available at Piping Mart?

  • Nut
  • Bar
  • Bolt
  • Pipe
  • Screw
  • Tubing
  • Valves
  • Washers
  • Flanges
  • Fasteners
  • Electrodes
  • Stud Bolts
  • Sheet Plates
  • Pipe Fittings
  • Forged Fitting
  • Instrumentation Fittings

AISI 1140 Composition

AISI 1140 steel displays versatile mechanical properties suitable for diverse applications. With a tensile strength ranging from 620 to 900 MPa, a yield strength of 470 MPa, and an elongation of 15%, this medium carbon steel provides a balanced combination of strength and ductility, making it apt for various engineering and manufacturing purposes.

Element Content (%)
Iron, Fe 98.39 – 98.93
Manganese, Mn 0.700 – 1.00
Carbon, C 0.370 – 0.440 %
Sulfur, S ≤ 0.130
Phosphorous, P ≤ 0.0400

AISI 1140 Mechanical Properties

AISI 1140 steel composition encompasses approximately 0.370-0.440% Carbon, 0.700 – 1.00 Manganese, ≤ 0.0400 Phosphorus, and ≤ 0.130 Sulfur. This medium carbon steel’s precise blend of elements imparts strength and wear resistance, making it well-suited for applications where a balance of durability and toughness is essential, such as in machinery components and structural parts.

Properties Metric Imperial
Elastic modulus 190-210 GPa 27557-30458 ksi
Poisson’s ratio 0.27-0.30 0.27-0.30

AISI 1140 Physical Properties

AISI 1140 steel has a density of approximately 7.85 g/cm³, Indicating a balanced weight-to-volume ratio. While specific details about its melting point are not commonly available, the density provides insight into its mass properties, Which are essential for various engineering and manufacturing applications.

Properties Metric Imperial
Density 7.7-8.03 g/cm3 0.278-0.290 lb/in3
Melting point 1455°C 2650°F

AISI 1140 Equivalent

  • ASTM A29
  • ASTM A510
  • ASTM A576
  • SAE J1397
  • SAE J403
  • SAE J412

AISI 1140 Uses

SAE / AISI 1140 is used in various applications, including gears, Crankshafts, Connecting Rods, Shafts, and other carburizing parts. The alloy’s high strength-to-weight ratio makes it ideal for use in Automotive and Aerospace applications where weight reduction is important. Other common uses include construction equipment components such as bulldozer blades and crane hooks.

AISI 1140 Uses in Industries

  • Automotive Industry
  • Construction
  • Machinery
  • Oil and Gas Industry
  • Aerospace

Benefits of AISI 1140

There are many benefits to using SAE / AISI 1140. First of all, the alloy has excellent mechanical properties. It is also easily welded thanks to its low carbon content. In addition, the alloy has good machinability and ductility properties. Finally, the alloy’s high strength-to-weight ratio makes it ideal for various applications where weight reduction is important.

AISI 1140 Corrosion Resistance

SAE / AISI 1140 steel is made of carbon and manganese, which gives it superior corrosion resistance. It also has excellent wear resistance and strength-to-weight ratio, making it an ideal choice for applications that require products to stand up to harsh environments. This type of steel has very good machinability properties, which helps to improve its durability and performance. It is also resistant to cracking under stress, and its welding characteristics are good for structural components to be properly welded together. Because of its strength, low cost, and corrosion resistance, SAE/ AISI 1140 steel is becoming increasingly popular among manufacturers who need dependable materials for their production processes.

AISI 1140 Heat Resistance

AISI 1140 is a versatile and highly heat-resistant grade of carbon steel. With its balanced alloy composition and high hardenability factor, it can maintain its toughness even when operating in environments with high temperatures. Its improved wear resistance makes it ideal for components in machines that must repeatedly pass through heated or cooled cycles for prolonged periods. Its excellent machinability enables the production of precision parts. AISI 1140 is a popular choice when selecting steel for industrial and commercial applications that need to withstand high temperatures without losing structural integrity.

AISI 1140 Machinability

Machining SAE/AISI 1140 steel requires special attention to technique and tooling. This alloy is noteworthy for its high strength-to-weight ratio and excellent machinability. While machining this grade of steel produces excellent surface finishes. Additionally, titanium nitride or sulfurized coatings on cutting tools are often recommended to extend tool life. By following these guidelines, experienced operators can consistently produce good quality parts out of 1140 steel.

AISI 1140 Weldability

AISI 1140 steel exhibits fair weldability, making it suitable for welding applications when proper procedures are followed. Preheating and post-weld heat treatment may be necessary to minimize the risk of cracking. Adequate precautions ensure efficient weldability, allowing AISI 1140 to be successfully integrated into various manufacturing processes.


SAE/AISI 1140 Steel, designated as UNS G11400, is a versatile medium carbon steel renowned for its balanced composition and notable mechanical properties. With commendable strength, wear resistance, and machinability, it is a reliable choice for diverse applications, ensuring durability and optimal performance in various engineering and manufacturing scenarios.

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