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Steel C45

C45 steel (AISI 1045) is the best choice for strength and versatility! Exceptional tensile strength, excellent machinability and remarkable versatility.

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Steel c45 CNC machining


  • High tensile strength
  • Versatility
  • Good hardness and wear resistance
  • Weldability


  • Low corrosion resistance
  • Performance degrades at high temperatures


  • Machining process: CNC machining
  • Tolerances: ISO 2768-1 fine (f) or medium (m) class. Info
  • Max size: 300 x 300 x 150 mm; 11.8 x 11.8 x 5.9 in
  • Lead time: <6 days

Rating 4.81 / 5.00

Based on 634 reviews

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High Tensile Strength

Its exceptional load-carrying capacity ensures reliable and long-lasting performances in a wide range of fields, from automotive to heavy machinery.



Its versatility makes it suitable for different applications in a wide range of industries, meeting a variety of different needs thanks to its versatile properties and reliable performance.


Good Hardness and Wear Resistance

This feature makes it an ideal choice for applications where parts are exposed to friction, wear and abrasion, ensuring a longer lifetime for the parts.



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C45 steel (AISI 1045) is a medium-carbon steel that offers a unique balance of mechanical properties, including high tensile strength and good machinability, along with economic advantages that make it an advantageous choice in many industrial applications.


High Tensile Strength: C45 steel is characterised by its exceptional tensile strength, a key feature for components that must withstand intense forces. This property makes it an ideal choice for gears, shafts and axles, where durability and reliability are essential to ensure optimal long-term performance.

Versatility: The versatility of C45 makes it suitable for a wide range of industries, from automotive to construction and heavy machinery. Thanks to its excellent properties, this material enables efficient production and offers design flexibility, adapting to multiple end-use applications and ensuring a reliable solution to the specific needs of each production context.

Good Hardness and Wear Resistance: Through heat treatment, AISI 1045 can achieve high hardness and wear resistance. This leads to reduced maintenance costs and increased component life, making this material particularly suitable for situations where wear is a critical factor.

Weldability: A further advantage of this alloy is its good weldability. This feature enables efficient production processes and offers flexible design opportunities, allowing complex, quality components to be manufactured without compromising structural integrity. The ability to be easily welded makes it a convenient and practical choice for a wide range of industrial applications.


Low Corrosion Resistance: One of the main limitations of this steel is its low corrosion resistance compared to stainless steel alloys. This vulnerability to corrosion can be a problem in environments exposed to corrosive agents, such as moisture, salt water or aggressive chemicals. To mitigate this problem, additional protective coatings or anti-corrosion treatments may be required, which can increase production and maintenance costs. However, it is important to carefully evaluate the need for such preventive measures based on the application specifications and the environment in which the C45 steel will be used.

Reduced Performance at High Temperatures: In situations where C45 is subjected to high temperatures, its performance may be compromised. At high temperatures, this material may suffer a decrease in strength and hardness, limiting its potential applications. It is important to consider this factor during design and material selection to ensure that the steel is suitable for the intended operating conditions and can maintain its mechanical properties even at elevated temperatures. Otherwise, it may be necessary to consider the use of other alloys specifically designed to withstand high temperatures.


Automotive: In the automotive sector, AISI 1045 is widely used for the manufacture of gears, drive shafts, axles and chassis components. Its high tensile strength guarantees the robustness required to withstand mechanical stress, contributing to the safety and reliability of vehicles. The versatility of this material also allows complex parts to be manufactured with precision, improving the efficiency of production processes.

Construction Sector: In the construction field, C45 steel is used for load-bearing structures, beams, bolts and tie rods. Its tensile and compressive strength makes it ideal for supporting heavy weights and resisting static and dynamic stresses. In addition, its machinability allows for easy modelling and adaptation to the specific design requirements of each structure, guaranteeing strength and durability over time.

Heavy Machinery Sector: In heavy machinery, C45 is used for the manufacture of components subject to high mechanical stress. Its high tensile and fatigue strength makes it suitable for gears, shafts and other parts subject to high loads. In addition, its good machinability and weldability allow for rapid manufacture and repair of parts, reducing downtime and increasing operational efficiency.

Mechanical Production Industry: In the mechanical production sector, this alloy is widely used for the manufacture of machinery, industrial equipment and tools. Its high tensile strength makes it ideal for components subject to intense mechanical stress, such as shafts, gears, bolts and keys. The versatility of this material allows complex parts to be manufactured with precision and reliability, contributing to the efficiency of production processes and the quality of the final product.

Comparision with other steel alloys

When selecting the right material for a specific application, it is crucial to carefully evaluate the specific requirements of the application. Although C45 steel offers a unique combination of strength, versatility and cost-effectiveness, there are other steel alloys that may be more suitable in specific applications.

For example, for applications subject to high levels of corrosion, such as marine environments or chemical industries, stainless steel alloys such as 304 and 316 may be preferable due to their greater corrosion resistance. Although these alloys may be more expensive than C45 steel, they offer greater durability in aggressive environments, reducing the need for additional protective coatings and long-term maintenance costs.

On the other hand, if the priority is strength and wear resistance at a more affordable price, C45 can be a convincing alternative to more expensive alloys such as AISI 4140. With its robust mechanical properties and machinability, AISI 1045 offers excellent value for money, making it a pragmatic choice for a wide range of industrial applications.

Ultimately, the choice between different steel alloys will depend on the specific requirements of the application, including environmental conditions, strength and durability requirements, and budget constraints. A careful evaluation of these factors will help determine which steel alloy is best suited to ensure optimal performance and sustainable costs in the long term.


In conclusion, C45 steel (AISI 1045) emerges as a solid choice for a wide range of industrial applications due to its distinctive balance of mechanical properties and cost-effectiveness. Its high tensile strength, together with good machinability, makes it ideal for components subject to intense forces and for structures requiring strength and durability. The versatility of this material is reflected in the automotive, construction, heavy machinery and mechanical manufacturing sectors, where its reliability is critical to operational success. However, it is important to consider its disadvantages, such as limited corrosion resistance and reduced performance at high temperatures, when selecting the material for a specific application. In comparison with other steel alloys, C45 offers an excellent combination of performance and cost-effectiveness, although it is essential to carefully evaluate the specific requirements to ensure the most suitable choice for the project's requirements.

"As a mechanical engineer, I needed precise C45 steel alloy parts. Weerg user-friendly platform, competitive quotes, and exceptional part quality exceeded my expectations. Fast turnaround and responsive customer service sealed the deal!"

steel alloy C45 PROPERTIES

Tensile breaking load 650 MPa
Modulus of elasticity 210 GPa
Elongation at break 15%
Density 7,87 g/cm³
Melting temperature 1495°C
Hardness 205 Brinell
Yield Strength 300 MPa


"As a product designer, I chose Weerg for custom C45 steel alloy parts. The easy-to-use platform, transparent pricing, and impressive accuracy on my components were top-notch. Fast production and excellent service made my experience superb. Highly recommended!"



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