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Mild carbon round bar
Round bar is a solid strip of steel with a circular cross section, Its specifications are cxpressed in millimcters of diamcter, such as "50" mcans round ms steel with a diameter of 50 mm, 45 # round steel bar is divided into three types: hot rolling, forging and cold drawing.
Low carbon: Refers to steel with a low carbon content. Typically, this refers to carbon steel with a carbon content between 0.05% and 0.25% or 0.30%.
What is size?
The size of mild steel bar is 5.5-250 mm. Among them 5.5-25mm small round steel is mostly supplied in straight bundles, and is often used as steel bars, bolts and various mechanical parts.
Round steel bar larger than 25mm is mainly used for manufacturing mechanical parts or seamless steel pipe billets.
Mild carbon steel bar is typically available in various diameters (e.g., Φ10mm, Φ20mm, Φ50mm, etc.).
Steel bar is available in various lengths (usually fixed lengths such as 6 meters and 9 meters, or in variable lengths).
It has various surface finishes, such as hot-rolled (black skin), cold-drawn (high dimensional accuracy, bright surface), and polished (finished).
Examples of Common Steel Grades (Different Countries/Standard Systems)
China: Q195, Q215, Q235 (Grades A, B, C, and D), 08, 10, 15, 20, and 25, among others.
USA: A36 (the most commonly used structural steel), 1018, 1020, and 1022, among others.
International/European: S235JR, S275JR, and E295 (1.0050), among others.
Japan: SS330, SS400, S15C, S20C, and S25C, among others.
Application
Auto Parts
Mild carbon steel round bar is widely used to make various parts, such as bolts and nuts, which are essential to ensure the structural strength and safety of automobiles.
Hardware tools/chemical field
Manufacturing of various hand tools and mechanical equipment, which play an indispensable role in industrial production and daily life.Round steel bar is used in the manufacture of various pipes, valves and other components, the performance of which directly affects the efficiency and safety of chemical production.
In addition to the above, low carbon round bar is also used to make cutlery, cupboards, boilers and other household equipment, as well as some key components in the building materials and food industries. These applications not only reflect the universal applicability of low carbon round bar, but also its important role in improving product quality and safety.
Key Points to Consider When Purchasing or Using Low-Carbon Steel
Specific Grade: Different grades of low-carbon steel vary slightly in composition (such as Mn content, S/P impurity control) and mechanical properties (yield strength, tensile strength), and the selection should be based on the intended use.
Dimensions: Diameter and length.
Surface Condition: Hot-rolled (surface scale), cold-drawn (bright, high dimensional accuracy), lathe/polished (high precision, high finish), etc., which may affect the appearance and accuracy during subsequent processing or direct use.
Implementation Standards: Such as the Chinese National Standard (GB), American Standard (ASTM), Japanese Standard (JIS), and German Standard (DIN) to ensure that the material meets project or design requirements.
Simply put, low-carbon round bar is a general-purpose round steel material that is easy to process (especially welding and cold bending), has good toughness, moderate strength, and is affordable. It is widely used in various fields such as construction, machinery manufacturing, and hardware processing. When you need a round bar that is easy to weld and form, and does not require ultra-high strength, low-carbon round bar is usually the first choice.
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