Product Introduction

C45 Carbon Steel Round Bar, complying with DIN EN 10083 standards, is a medium-carbon steel with 0.42-0.50% carbon content, offering enhanced strength and hardness compared to low-carbon grades. It achieves a tensile strength of 570-700 MPa, yield strength of 310 MPa, and 14-21% elongation, balancing mechanical performance with moderate ductility. This steel excels in machinability and can be heat-treated (e.g., quenching and tempering) to improve wear resistance and toughness. Common applications include manufacturing shafts, gears, bolts, and machinery components requiring high load-bearing capacity. While its higher carbon content reduces weldability compared to low-carbon steels, preheating and post-weld treatments can mitigate cracking risks. C45’s cost-effectiveness and versatility make it ideal for industrial parts where strength and durability are prioritized over extreme formability. Its consistent properties and broad compatibility across engineering sectors cement its role as a reliable choice for medium-strength structural and mechanical applications.

About Us

Zhongxi Metal is a professional manufacturer engaged in the research, development, production, sale and service.,  is committed to providing one-stop steel procurement services for global client.

Why Choose C45 Carbon Steel Round Bar?

1. Optimized Strength-Hardness Balance

C45 achieves tensile strength of 570–700 MPa and yield strength of 310 MPa through heat treatment (quenching/tempering), with 14–21% elongation maintaining moderate ductility. This makes it ideal for high-load components like shafts, gears, and bolts in machinery and automotive sectors.

2. Superior Machinability and Formability

With 0.42–0.50% carbon, C45 offers excellent machinability using standard cutting tools and supports bending/forging without excessive tool wear. Its moderate carbon content reduces brittleness compared to high-carbon steels, enabling reliable cold-forming processes.

3. Flexible Heat Treatment Adaptability

C45’s medium-carbon composition allows tailored mechanical properties via heat treatment—quenching for hardness or tempering for toughness. This versatility suits applications requiring wear resistance (e.g., gears) or impact durability (e.g., structural supports).

4. Cost-Effective Performance for Medium-Strength Needs

As a low-alloy steel, C45 provides high strength-to-cost efficiency. Its affordability makes it a preferred choice for industrial parts where extreme alloys (e.g., chromium-molybdenum steels) are unnecessary, balancing performance and budget.

5. Broad Industrial Compatibility

C45 is widely used in manufacturing (shafts, gears), construction (bolts, pins), and automotive (drive components) due to consistent mechanical properties and ease of integration. It meets DIN EN 10083 standards, ensuring global compatibility and reliable performance.

We have our own Physical & Chemical Testing Center Lab to guarantee our product quality. Our test items & instrument fully meet international standards.

Applications of Carbon Steel Round Bar

As a basic industrial material, carbon steel round bars play a key role in many fields with their excellent mechanical properties and wide applicability. In the field of construction and infrastructure, carbon steel round bars are often used to manufacture core components such as beams, columns, bridges, and steel structures. Their high strength and good plasticity can withstand complex mechanical loads and ensure structural stability. For example, low-carbon steel round bars (carbon content ≤ 0.25%) are widely used in steel bars, bolts, and mechanical parts due to their easy processing and good welding performance; medium-carbon steel round bars (carbon content 0.25%~0.6%) are suitable for high-load components such as shafts, gears, and seamless steel pipe billets due to their balance of strength and toughness. In addition, in the energy industry, carbon steel round bars are used for oil/gas pipelines, power generation equipment, and nuclear power plant structural parts. Their high temperature resistance and corrosion resistance meet the requirements of extreme working conditions.

In the field of automobile and machinery manufacturing, the application of carbon steel round bars is also indispensable. In the automotive industry, it is used in components such as body frames, chassis, engine brackets, and wheels to provide safe and reliable mechanical support. High carbon steel round bars (carbon content > 0.6%) are often used to manufacture cutting tools, bearings and springs due to their extremely high hardness to ensure wear resistance and service life. For example, W1 tool steel round bars are used to make chisels, punches, woodworking tools, swords and knives with their excellent wear resistance, hardenability and toughness. They are especially suitable for cutting tasks that require high precision and durability. In addition, carbon steel round bars are also widely used in the manufacture of equipment such as pipes, boilers, containers, railway vehicles and electric welders. Special purpose round steel (such as prestressed steel wire, spring round steel) shows unique value in specific fields. Its diverse performance and specifications make carbon steel round bars an indispensable basic material in modern industry.

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As a leading company, Zhongxi Metal is known for our excellent product quality and professional services, providing our customers with a reliable partner. We have a global sales network that can meet the needs of customers in different countries and regions.If you need more information about us or have any other needs, please feel free to contact us. We look forward to working with you to create a better future.