ThePipingMart Blog Grades SAE – AISI 1029 Carbon Steel – Properties, Uses and Composition

SAE – AISI 1029 Carbon Steel – Properties, Uses and Composition

SAE / AISI 1029 Steel

SAE/AISI 1029 steel is a medium-carbon steel with good machinability and weldability. It has a relatively low tensile strength that gives it a more ductile nature, making it ideal for use in applications where strength is not the primary requirement. This article will look closely at SAE/AISI 1029’s composition, mechanical properties, physical properties, uses, corrosion resistance, heat resistance, heat treatment, machining, and welding.

AISI 1029 Composition

SAE/AISI 1029 contains 0.3-0.6% carbon and up to 0.7% manganese. The carbon content increases the strength of the material, while the manganese helps to increase its hardness and wear resistance. This steel also contains small amounts of sulfur (up to 0.05%), which can help improve its machinability and strength at higher temperatures; however, too much sulfur can reduce its weldability.

Element Content (%)
Iron, Fe 98.7-99.15
Manganese, Mn 0.600-0.900
Carbon, C 0.250-0.310
Sulfur, 0.0500
Phosphorous, P 0.0400

AISI 1029 Mechanical Properties

SAE/AISI 1029 has a good tensile strength (below 150 MPa) but relatively low yield strength (below 140 MPa). This means that it is quite ductile and can be used in applications where strength isn’t the primary factor needed for success. It does have a high impact toughness, so it can be used in some applications requiring good shock resistance and is highly formable, so it can be bent or shaped into desired shapes without cracking or breaking easily.

Properties Metric Imperial
Modulus of elasticity 190-210 GPa 29700-30458 ksi
Poisson’s ratio 0.27-0.30 0.27-0.30

AISI 1029 Physical Properties

The physical properties of SAE/AISI 1029 are similar to other medium-carbon steels such as A36 or 1018. Its density is 7.85 g/cm³, which makes it slightly heavier than other steels, such as mild steel (7 g/cm³) but still lighter than stainless steel (8 g/cm³). Its melting point is 1450°C, which is higher than most other steels, so it needs to be heated up before welding or forming operations can begin safely. Its thermal conductivity ranges from 25-35 W/(mK) depending on temperature, which makes it an average conductor of heat compared to other metals such as copper (400 W/(mK)) or aluminium (220 W/(mK)).

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

AISI 1029 Equivalent

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

AISI 1029 Uses

AISI/SAE 1029 is a carbon steel alloy often used to produce cold-drawn components. Its low cost and good mechanical properties make it suitable for various welding applications and threaded parts. Heat-treated AISI/SAE 1029 can be used to make numerous mechanical components that require great strength and hardness, such as rope sheaves, bearing races, hubs, crank pins, eccentrics and many other parts. It is also widely used in forging operations to manufacture structural components such as bolts, clamps and bearings. As a result of its outstanding combination of yield strength and ductility, AISI/SAE 1029 is a popular material for making automobile parts like leaf springs and clutch plates. Furthermore, when annealed, it also has numerous applications within the agricultural industry due to being corrosion-resistant.

Corrosion Resistance

1029 carbon steel, also known as mild steel, is renowned for its corrosion resistance. Its protective oxide film is a physical barrier that protects it from corrosive elements. In addition, it contains elements such as manganese and phosphorus, which increase its corrosion resistance by forming stable compounds with oxygen, which prevent further oxidation of the steel. Other characteristics that give SAE / AISI 1029 an edge regarding corrosion resistance are its low hardness and ductility, making it more resistant to embrittlement due to environmental factors such as humidity. These properties make SAE / AISI 1029 an excellent choice for outdoor applications where contact with corrosive agents in the atmosphere makes other materials unsuitable.

Heat Resistance

Grade 1029 is quickly becoming one of the more popular materials for high-grade heat resistance. This type of grade steel offers an impressive melting point of 1430°C, making it ideal for applications requiring withstanding high temperatures and levels of thermal shocks. It also boasts excellent mechanical properties and can be known to have other benefits depending on its application. Those looking to use SAE/AISI 1029 in their projects can rest assured that its oxidation resistance will remain reliable at up to 980°C. It is one of the best material choices when factoring heat resistance into any project.

Heat Treatment

Heat treatment of SAE 1029 carbon steel can profoundly affect the material’s mechanical properties. Through this process, the alloy can be toughened and strengthened, increasing its hardness and resistance to wear. It also helps prevent deformation and cracking from excessive stress. Heat treatment of SAE/AISI 1029 involves heating it to a specific temperature, depending on the desired outcome, before quickly cooling it with a medium such as water or oil. This rapid cooling helps create a fine-grained structure in the material, which produces the expected properties. Despite its impressive strength, careful heat treatment is required to ensure that SAE/AISI 1029 achieves its maximum potential.


AISI 1029 carbon steel machining can be tricky, but with the right tools and techniques, you can quickly get good results. This low-alloy, carbon steel grade has moderate strength and good formability, making it ideal for many different parts. When machining, it is essential to use sharp tools that are less likely to skid on the workpiece surface due to their higher hardness than in softer materials. Using lubricants appropriately will also help improve performance, extending tool life and improving finish quality. With the proper knowledge of material properties and a willingness to experiment with cutting parameters, SAE / AISI 1029 machining can lead to excellent product outcomes.


Alloy 1029 welding is a process used to join different metals in the construction of vehicles and other types of machinery. It requires a specific set of skills and the proper equipment to be carried out correctly, which is why it’s important for those considering this type of welding project to be sure they have ample knowledge about the process beforehand. With SAE/AISI welding, you’ll want to make sure you use an acetylene torch instead of an oxy-fuel gas torch and a wire designed for the metal being welded together. Additionally, it’s best practice to secure parts before the welding process with a clamp or vise, as this will create stronger bonds. While there is a bit of a learning curve required to become competent at SAE/AISI welding, with practice and dedication, it can become quite easy, allowing individuals to achieve professional results on their projects.


Overall, SAE/AISI 1029 steel is a versatile material that can be used in many different applications due to its mix of mechanical and physical properties, including good tensile strength, high impact toughness and excellent weldability coupled with excellent formability that makes it easy to work with for both manufacturing and repairs alike. Its corrosion resistance is average compared to other metals, but its heat resistance makes it suitable at elevated temperatures when necessary. With proper heat treatment and machining operations applied correctly, this material should last for many years in whatever application you may need it for!

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