Product Introduction

Q255 Carbon Steel Round Bar, with 0.22-0.28% carbon content and ≥255 MPa yield strength, delivers optimal balance of strength, ductility, and machinability. Its moderate carbon composition enables excellent cold/hot forming, welding, and threading without compromising structural integrity. Heat treatment enhances hardness and wear resistance, making it ideal for gears, shafts, and machinery components under moderate stress. Cost-effective and reliable, it ensures dimensional stability during manufacturing, reducing waste and rework. Smooth surface finish improves corrosion resistance when galvanized or powder-coated, extending service life in outdoor and humid environments. As a recyclable material, it aligns with sustainable manufacturing practices. Trusted in construction, automotive, and industrial equipment sectors, Q255 guarantees consistent performance, affordability, and eco-friendliness. Don’t settle for less—experience unmatched value and precision with Q255.

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 Q255 Carbon Steel Round Bar?

1. Balanced Strength-Toughness Ratio

Q255 offers a yield strength of approximately 255 MPa and tensile strength up to 656 MPa, paired with 21% elongation and 44% reduction in area. This combination ensures reliable load-bearing capacity while maintaining ductility for structural applications.

2. Excellent Fabrication Versatility

The low carbon content (0.18-0.28%) enhances weldability, formability, and machinability. It supports bending, rolling, and welding processes, making it ideal for custom structural components like beams, columns, and trusses.

3. Cost-Effective Performance

As a low-alloy structural steel, Q255 provides high strength-to-cost efficiency. Its affordability and availability make it a preferred choice for general construction, automotive parts, and manufacturing equipment where extreme strength is not critical.

4. Enhanced Corrosion Resistance Options

While inherently susceptible to corrosion, Q255 can be treated with protective coatings (e.g., galvanization, paint, or powder coating) to extend service life in harsh environments, such as outdoor or industrial settings.

5. Broad Industry Compatibility

Q255 is widely used in construction (frameworks, bridges), automotive (non-critical body/structural parts), and manufacturing (bolts, shafts, machine components) due to its consistent mechanical properties and ease of integration into diverse designs.

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.

Contact Us

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.