Product Introduction

A36 Hot Roll Steel Round Bar, conforming to ASTM A36 standards, is a low-carbon structural steel with carbon content ≤0.29%, manganese 0.60-0.90%, and trace silicon, phosphorus, and sulfur. It offers a yield strength of 250 MPa and tensile strength of 400-550 MPa, paired with 20% elongation, ensuring balanced strength, ductility, and toughness. This material excels in weldability, formability, and machinability, supporting processes like cutting, bending, forging, and welding without significant brittleness. Widely used in construction (beams, columns, bridges), automotive (chassis, brackets), and machinery (shafts, gears), A36 provides cost-effective performance for general structural applications. Its affordability, availability, and consistent mechanical properties make it a staple in industrial engineering. While prone to corrosion, protective coatings or galvanization extend its lifespan. With broad industry compatibility and reliable fabrication ease, A36 remains a preferred choice for projects requiring strength, durability, and economic efficiency.

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 Carbon Steel Round Bar?

1. Superior Weldability & Fabrication Ease

Low carbon content (≤0.29%) minimizes weld cracking risks, enabling seamless MIG/TIG/arc welding without preheating. Its formability supports cold/hot bending, machining, and forging, ideal for complex structural designs.

2. Balanced Strength & Ductility

With 250 MPa yield strength, 400–550 MPa tensile strength, and 20% elongation, A36 ensures reliable load-bearing capacity while maintaining ductility for dynamic/static applications like beams, columns, and automotive frames.

3. Cost-Effective Structural Solution

As a low-alloy steel, A36 offers affordable performance for general construction, machinery, and infrastructure projects, reducing costs without compromising safety in non-critical applications.

4. Broad Industry Compatibility

Conforming to ASTM A36 standards, it suits diverse sectors: construction (bridges, buildings), automotive (chassis, brackets), and manufacturing (bolts, shafts), ensuring consistent performance across varying design needs.

5. Corrosion Mitigation Flexibility

While prone to rust, A36’s lifespan extends via protective coatings (galvanization, painting) or surface treatments (carburizing), enabling use in humid/marine environments with anti-corrosion strategies.

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.