ThePipingMart Blog Grades SAE/AISI 4032 Steel (UNS G40320) – Composition, Properties and Uses

SAE/AISI 4032 Steel (UNS G40320) – Composition, Properties and Uses

SAE/AISI 4032 Steel

If you seek a robust, machinable, and corrosion-resistant steel alloy, consider UNS G40320. SAE/AISI 4032 steel is renowned for its advantageous properties and has extensive use across diverse industries. Recognized for exceptional weldability, it excels in applications requiring wear resistance, prevalent in aerospace, automotive, and heavy equipment sectors. Distinct from SAE-AISI 4340, 4032 Steel boasts lower carbon and alloy content while delivering impressive tensile strength and toughness. Its composition, encompassing carbon, manganese, silicon, chromium, molybdenum, and nickel, positions it favourably for structural components in machinery and tools. AISI 4032 Steel (UNS G40320) is a versatile and invaluable material widely embraced across various industrial applications.

What Forms of AISI 4032 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 4032 Composition

AISI 4032 steel features a meticulously designed composition for outstanding performance. This low-alloy steel integrates essential elements like carbon, manganese, silicon, chromium, molybdenum, and nickel. Each constituent enhances the alloy’s unique properties, creating a harmonious blend of strength, toughness, and corrosion resistance. This thoughtfully crafted composition positions AISI 4032 as a preferred material across diverse applications, particularly in industries demanding dependable and adaptable steel alloys.

Element Content (%)
Iron, Fe 98.025
Manganese, Mn 0.70 – 0.90
Carbon, C 0.30 – 0.35
Silicon, Si 0.20 – 0.35
Molybdenum, Mo 0.20 – 0.30
Sulfur, S 0.040
Phosphorous, P 0.035

AISI 4032 Mechanical Properties

AISI 4032 steel exhibits commendable mechanical properties, making it versatile for various applications. Notable characteristics include high tensile strength, toughness, and wear resistance. These properties contribute to its suitability for structural components in machinery and tools, particularly high-stress applications. The alloy’s robust mechanical profile underscores its reliability in diverse industrial scenarios.

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

AISI 4032 Physical Properties

AISI 4032 steel exhibits unique physical properties crucial in shaping its performance. These encompass key attributes such as density, hardness, and thermal conductivity. Grasping these physical traits is vital for evaluating the alloy’s appropriateness across different applications, ensuring its optimal strength, durability, and heat resistance performance.

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

AISI 4032 Uses

SAE/AISI 4032 steel is commonly used in applications that require high wear resistance and strength. It is also often used for automotive components such as gears, shafts, and engine blocks. Its high machinability makes it an ideal choice for complex parts or components that need to be precisely machined. Additionally, its strength and hardness make it suitable for structural applications, including fasteners and springs.

AISI 4032 Uses in Industries

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

AISI 4032 Corrosion Resistance

In addition to its strength and machinability, UNS G40320 also offers good corrosion resistance when exposed to normal atmospheric conditions. It is important to note that it may not be as corrosion-resistant when exposed to more severe environments such as salt water or other chemicals. In these cases, it may be necessary to use additional protection, such as a protective coating or heat treatment process.

AISI 4032 Heat Resistance

SAE/AISI 4032 also offers good heat resistance up to around 400°C (752°F). This makes it ideal for applications where exposure to high temperatures is expected, such as automotive exhaust systems or aerospace components. However, prolonged exposure can weaken the metal, so it should always be tested before use in high-temperature applications.

AISI 4032 Heat Treatment

SAE/AISI 4032 can be heat treated in order to improve its mechanical properties or change its shape or size. The most common heat treatments include hardening, tempering, annealing, and quenching, which can all help improve the material’s strength and durability while still retaining its malleability for other uses.

AISI 4032 Machining

Due to its malleable nature, SAE/AISI 4032 can easily be machined into any shape or size without much effort. It is important to note that due to its hardness, it will require higher cutting speeds than softer metals like aluminium, but with the proper tools and techniques, this should not pose much of a problem for experienced machine operators.

AISI 4032 Welding

SAE/AISI 4032 can also be welded using standard welding techniques such as MIG or TIG welding processes, although special attention should be paid when welding this material due to its hardness which can make it difficult to work with at times. With proper preparation and care, however, this task should not present too much of a challenge, even for novice welders.


In conclusion, SAE/ AISI 4032 provides robust strength with excellent machinability capabilities, making it ideal for many different applications, including automotive parts, structural components, fasteners, and springs, among others, while still offering good corrosion resistance when in normal atmospheric conditions as well as good heat resistance up to 400°C (752°F). Additionally, this material can easily be welded using standard welding techniques with some extra care being taken due to its hardness while still allowing for easy machining into any shape or size if necessary making it a great choice for many different projects regardless of scale or complexity level required by the job at hand!

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