Round bar refers to solid, long steel bars with a circular cross-section. Its specifications are expressed in terms of diameter, measured in millimeters (mm); for example, “50 mm” refers to a round bar with a diameter of 50 millimeters.
Classification by Manufacturing Process
Round bars are classified into three types: hot-rolled, forged, and cold-drawn. Hot-rolled round bars are available in sizes ranging from 5.5 to 250 millimeters. Among these, small round bars measuring 5.5–25 mm are mostly supplied in bundles of straight bars and are commonly used as reinforcing bars, bolts, and various mechanical parts; round bars larger than 25 mm are primarily used in the manufacture of mechanical parts and billets for seamless steel pipes.
Round bars are classified by manufacturing process into: hot-rolled round bars, forged round bars, and cold-drawn round bars.
Based on carbon content, they are classified as low-carbon steel, medium-carbon steel, and high-carbon steel; based on application, they are classified as carbon structural steel and carbon tool steel.
Grades:
Round bar grades: Q195, Q235, 10#, 20#, 35#, 45#, Q215, Q345, 12Cr1Mov, 15CrMo, 304, 316, 20Cr, 40Cr, 20CrMo, 35CrMo, 42CrMo, 40CrNiMo, GCr15, 65Mn, 50Mn, 50Cr, 3Cr2W8V, 20CrMnTi, 5CrMnMo, etc.
Differences Between Round Bars and Other Reinforcing Bars:
1. The surface profiles differ. Round bars have a smooth, round surface without grooves or ribs, whereas other reinforcing bars feature grooved or ribbed surfaces. As a result, round bars have lower bond strength with concrete, while other reinforcing bars have higher bond strength with concrete.
2. The chemical compositions differ. Round bars (Grade 1 steel) are made of ordinary low-carbon steel, while other reinforcing bars are mostly made of alloy steel.
3. Strength: Round bars have lower strength, while other reinforcing bars have higher strength. That is, for round bars and other reinforcing bars of the same diameter, round bars can withstand less tensile force than other reinforcing bars. However, round bars have greater ductility than other reinforcing bars; that is, round bars undergo greater deformation before breaking, whereas other reinforcing bars undergo much less deformation before breaking.
Testing:
GB/T 8361-2021 Method for Surface Ultrasonic Testing of Cold-Drawn Round Bars
GB/T 26075-2019 Round Bars for Sucker Rods
GB/T 37566-2019 Method for Ultrasonic Testing of Round Bars
GB/T 32547-2016 Magnetic Flux Leakage Testing Method for Round Bars
GB/T 18669-2012 Round Bars for Marine Anchor Chains
GB/T 11260-2008 Eddy Current Testing Method for Round Bars
How do I order our products?
Ordering our steel products is very simple. You just need to follow the steps below:
1. Browse our website to find the right product for your needs. You can also contact us through website message, email, WhatsApp, etc. to tell us your requirements.
2. When we receive your quote request, we will reply you within 12 hours (if it is a weekend, we will reply you as soon as possible on Monday). If you are in a hurry to get a quote, you can call us or chat with us online and we will answer your questions and provide you with more information.
3.Confirm the details of the order, such as product model, quantity (usually starting from one container, about 28tons), price, delivery time, payment terms, etc. We will send you a proforma invoice for your confirmation.
4.Make the payment, we will start the production as soon as possible, we accept all kinds of payment methods, such as: telegraphic transfer, letter of credit, etc.
5.Receive the goods and check the quality and quantity. Packing and shipping to you according to your requirement. We will also provide after-sale service for you.
Post time: Jun-23-2026
