Hot Rolled Round Bar

The Hot Rolled Round Bar offers high production efficiency, and large-scale production brings cost advantages. The surface oxide scale is easily removed during subsequent processing, requiring no additional pretreatment. It exhibits good weldability and machinability, and its hardness and wear resistance can be further improved after heat treatment, making it suitable for diverse needs ranging from ordinary structural components to precision parts.

Shunchen Hot Rolled Round Bars offer balanced performance and wide applicability, combining high strength with good plasticity to withstand heavy loads, while also possessing excellent weldability and machinability. After heat treatment (such as solution hardening and vacuum quenching), hardness and wear resistance can be further enhanced, adapting to diverse needs ranging from general structural components to precision mechanical parts. Furthermore, different materials (such as carbon steel and alloy steel) can be customized to meet specific application requirements. Sizes are comprehensive and flexible, ranging from 5.5mm to 250mm, with standard lengths from 4 to 12 meters. Custom sizes and lengths are also supported. Small round steel bars are supplied in bundles, while large round steel bars are cut to order, satisfying both large-volume purchases and flexible small-batch needs.

Shunchen Hot Rolled Round Bars also offer advantages in both cost and efficiency. Hot rolling technology boasts high production efficiency and strong mass production capabilities, providing a significant cost advantage compared to cold-drawn and forged round steel bars. Surface oxide scale can be easily removed during subsequent processing, eliminating the need for additional pretreatment and shortening the production cycle. In terms of quality, Shunchun employs high-temperature rolling and precise temperature control technology to ensure dense internal structure and uniform batch performance. Mainstream products meet the dimensional accuracy of GB/T702—2017 standard Group I, with dimensional tolerances controlled within ±0.15mm and a surface decarburization layer depth ≤0.05mm, significantly reducing machining rework rates. Finally, Shunchun provides comprehensive technical support, covering material certification, heat treatment recommendations, cutting parameter guidance (such as cutting speed, feed rate, and tool selection), and partially offers pre-processing services, forming a closed loop of "material supply - process guidance - processing adaptation" to ensure high efficiency and convenience for customers.

Product Technical Specifications

Product application areas and cases

Construction Engineering

Hot Rolled Round Bar is used for steel structure frame support in high-rise buildings, concrete structural reinforcement, railings, etc., small round steel (Φ5.5-25mm) is often used as a base material for reinforcing bars and bolts, suitable for bridges, factories, civil buildings, and other scenarios.

Mechanical Manufacturing

For manufacturing parts such as motor shafts, drive shafts, gears, and couplings, 45# and 40Cr large round steel bars are the preferred materials for blanks of core mechanical components.

Automotive Industry

Used in key components such as engine shafts, half shafts, and body fasteners, these components rely on excellent machinability and strength to ensure vehicle stability.

Real customer user experience

Technical Director of a gearbox factory in Foshan: The product boasts excellent dimensional accuracy and performance stability. Each batch comes with a quality inspection report, and the dedicated cutting parameters provide practical guidance. The rework rate for Φ120mm 45# round steel is negligible after six months of continuous use. The technical team responds promptly.

Manager of a machining factory in Shenzhen: Strong adaptability to turning. The accompanying process instructions clearly specify details such as cutting speed and coolant type. The average first-piece debugging time has been reduced by 1.4 hours, resulting in significant improvements in production efficiency and stable delivery cycles.

Purchasing Manager of a construction company partnered with Kunming Iron & Steel Group: Q235B hot-rolled round steel meets the accuracy requirements of GB/T702—2017 standard Group I. It has no surface defects, uniform dimensions, strong structural stability after welding, and excellent cost-effectiveness and quality assurance.

Advantages of Choosing Us

Choosing Shunchun means enjoying a one-stop procurement service with integrated production and sales, supported by 10,000 square meters of warehousing. You'll also receive 24/7 after-sales service, real-time tracking across 18 key stages, and the backing of over 2,000 long-term partners and industry leaders, making your customized steel procurement more worry-free and reliable.

Tianjin Shunchun eliminates intermediate distribution links, offering factory-direct wholesale prices that are competitively priced compared to its peers in the same product category. With production companies in multiple locations nationwide, delivery is convenient and efficient, significantly improving supply efficiency and meeting the time-sensitive needs of large-volume purchases.

Reliable and Controllable Quality: Made from carefully selected high-quality steel billets, utilizing advanced hot rolling and precise temperature control technology, resulting in a dense internal structure and uniform batch performance. A rigorous end-to-end testing and traceability system ensures compliance with national and international standards, significantly reducing machining rework rates.

Flexible Specifications and Customization: Covering diameters from 5.5mm to 250mm and lengths from 4 to 12 meters, with ample stock available. Custom sizes, lengths, and materials are supported; small round bars are supplied in bundles, while large round bars are cut to order, catering to both large and small-batch procurement needs.

Cost-Efficiency Advantages: Hot rolling technology offers high production efficiency and strong mass production capabilities, resulting in a significant cost advantage compared to cold-drawn and forged round bars. Surface oxide scale is easily removed during subsequent processing, eliminating the need for additional pretreatment and shortening the production cycle.

Comprehensive Technology and Service: Providing comprehensive technical support including material certification, heat treatment recommendations, and cutting parameter guidance. Some services offer pre-processing support, forming a closed loop of "material supply - process guidance - processing adaptation." Professional material selection guidance and full-process technical support ensure timely delivery, making procurement and use worry-free.