What is cold-rolled round bar?
Round bars made by rolling/drawing hot-rolled or forged round billets at room temperature are considered cold-worked products.
What are the common materials for cold-rolled round bar?
Carbon steel (such as 1018, 45#), stainless steel (such as 304, 316, 430), and alloy structural steel (such as 40Cr, 42CrMo).
What are the key differences between cold-rolled and hot-rolled round bar?
Cold-rolled round bar has a narrow dimensional tolerance (±0.05-0.1mm), a smooth surface (Ra ≤ 1.6μm), and high strength. Hot-rolled round bar, on the other hand, has a tolerance of approximately ±0.5mm and a rough surface.
How are cold-rolled round bar specifications expressed?
They are expressed in millimeters, such as Φ20, which means a diameter of 20 mm. Common sizes range from Φ1 to 100 mm.
What standards are followed for cold-rolled round bar?
International standards include ASTM A108, ASTM A29, domestic standards include GB/T 1220, Japanese JIS G4105, etc.