ThePipingMart Blog Grades SAE/AISI 1145 Carbon Steel(UNS G11450) – Composition, Properties and Uses

SAE/AISI 1145 Carbon Steel(UNS G11450) – Composition, Properties and Uses

SAE / AISI 1145 Steel

Are you searching for an efficient, reliable, and durable steel material? Look no further than SAE/AISI 1145 carbon steel! This industry-standard alloy, known as UNS G11450, offers high Strength, Hardness, and Excellent Machinability. As a medium carbon steel, it proves ideal for various applications, including cold heading components and screws. Gain more insights in this blog post to explore the composition, properties, and common uses of SAE/AISI 1145 Carbon Steel. This type of low-carbon steel, consisting of manganese and carbon, exhibits impressive formability and ductility. With a tensile strength of 380 MPa, AISI 1145 can withstand stress, making it suitable for diverse applications. Its exceptional machinability makes it a preferred choice in construction, automotive, and manufacturing industries. Moreover, AISI 1145 is advantageous for applications requiring cost-effective production, such as packaging and metal pressing. AISI 1145 Carbon Steel is a reliable and economical material widely employed across various industries.

What Forms of AISI 1526 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 1145 Chemical Composition

SAE/AISI 1145 is a low-carbon steel with a chemical composition typically containing 0.44% carbon, 0.69% manganese, and traces of other elements. It offers good formability and weldability. This steel is commonly used in applications requiring moderate strength and toughness, such as automotive components and appliance manufacturing.

Element Content (%)
Manganese, Mn 0.69
Carbon, C 0.44
Silicon, Si 0.20
Copper, Cu 0.06
Nickel, Ni 0.04
Sulfur, S 0.038
Phosphorous, P 0.037
Chromium, Cr 0.03
Arsenic, As 0.024
Aluminum, Al 0.006

AISI 1145 Physical Properties

The density of SAE/AISI 1145 carbon steel is around 7.7-8.03 grams per cubic centimeter (g/cm³) or 0.284 lb/in³. This measurement signifies the mass per unit volume of the material, playing a vital role in diverse engineering computations and applications.

Properties Metric Imperial
Density 7.7-8.03 g/cm3 0.278-0.290 lb/in3

AISI 1145 Mechanical Properties

The elastic modulus of AISI 1145 carbon steel is typically around 200 gigapascals (GPa), reflecting its stiffness under deformation. Poisson’s ratio for this material is generally approximately 0.29, indicating the transverse to axial strain ratio. These mechanical properties are essential for assessing the material’s behavior under various loading conditions.

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

AISI 1145 Thermal Properties

The thermal expansion coefficient of SAE/AISI 1145 carbon steel is an important thermal property. It represents the rate at which the material expands or contracts with changes in temperature. The specific coefficient value for 1145 carbon steel may vary, and it is crucial for predicting dimensional changes under thermal variations in engineering applications.

Properties Conditions
T (ºC) Treatment
Thermal expansion co-efficient (10-6/ºC) 14.8 0-700 annealed

AISI 1145 Uses

AISI 1145 steel is a medium carbon steel used in various industries and applications. The following are just some of the many uses for this versatile steel:

  • Automotive parts
  • Construction materials
  • Pipe fittings
  • Wear-resistant applications

Utilizing SAE/AISI 1145 steel offers several advantages, including notable Machinability, Superb Weldability, and High Strength. This steel demonstrates commendable corrosion resistance and heat resistance as well. Furthermore, SAE/AISI 1145 steel can undergo heat treatment to enhance its hardness and strength.

AISI 1145 Machinability

SAE/AISI 1145 steel exhibits excellent machinability, allowing easy cutting, drilling, milling, and tapping. Compared to other steel variants, SAE/AISI 1145 stands out at the upper echelon regarding machinability. This quality makes it an optimal choice for producing parts that require precise machining. Additionally, it’s worth mentioning that the machinability of this steel can be further enhanced through heat treatment. Conventional methods like turning, drilling, milling, and tapping can be applied for machining SAE/AISI 1145.

AISI 1145 Weldability

SAE/AISI 1145 steel weldability is outstanding, facilitating easy joining with other metal pieces through welding techniques. The key advantage of opting for weldable steel like SAE/AISI 1145 is eliminating the necessity for rivets, bolts, or other fasteners. This streamlines the manufacturing process and results in time and cost savings. SAE/AISI 1145 accommodates welding through various standard methods, encompassing gas, arc, and spot welding.

AISI 1145 Strength

SAE/AISI 1145 stands out as a high-strength steel, surpassing the strength of many other steels available in the market. Its heightened strength empowers manufacturers to employ thinner gauges while preserving the structural integrity of the finished product. Furthermore, the elevated strength levels make SAE/AISI 1145 an excellent choice for applications demanding wear resistance.

AISI 1145 Corrosion Resistance

SAE/AISI 1145 exhibits commendable corrosion resistance, effectively resisting rust and other forms of corrosion when subjected to damp conditions. The enhanced corrosion resistance renders it a preferred option for outdoor applications or any scenario where moisture is a factor.

AISI 1145 Heat Resistance

SAE/AISI 1145 boasts robust heat resistance. Enabling it to endure high temperatures without compromising its structural integrity. This heightened heat resistance positions it as an optimal selection for applications demanding elevated temperatures, such as in boiler or pressure vessel plates.

AISI 1145 Heat Treatment

SAE/AISI 1145 offers the flexibility of heat treatment to enhance its hardness and strength. The typical method involves quenching and tempering. Quenching entails heating the metal until it loses its magnetic properties and then rapidly cooling it in water or oil. Subsequently, tempering involves reheating the metal to a precise temperature below its critical point, followed by a slow cooling process in the air.


As you can see, there are many reasons why SAE / AISI 1145 is such versatile steel. It has good machinability and weldability properties and high strength and corrosion resistance levels.” If you are in need of medium-carbon steel for your next project, consider giving SAE / AISI 1145 a try.

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