Q215 Q275 Carbon steel bar
Wide Variety of Shapes – Carbon steel bars are available in multiple forms such as round, square, hexagonal, and octagonal, making them suitable for a broad range of engineering and construction applications.
High Versatility in Applications – Round steel bars are commonly used for manufacturing bolts, reinforcing bars, and mechanical components, and they can also serve as billets for producing seamless steel pipes.
Flexible Processing Options – Square steel bars can be produced through both hot-rolling and cold-rolling processes, allowing users to select the right type based on strength, precision, or surface finish requirements.
Strong and Reliable Material – As a solid long steel product, carbon steel bar offers excellent strength and durability, ensuring dependable performance in structural, mechanical, and industrial uses.
Carbon steel bar is a kind of solid long steel, and the common ones are round steel, square steel, hexagonal steel, octagonal steel, etc. Round steel is often used to make steel bars, bolts and various mechanical parts, as well as billets for seamless steel pipes. Square steel refers to steel that is rolled or processed into a square section, which can be divided into hot-rolled and cold-rolled.
Carbon steel grades and chemical composition
Grade | Level | Chemical Composition,% | Deoxygenation Method | Use | ||||
C | Mn | Si | S | P | ||||
No greater than | ||||||||
Q195 | - | 0.06~0.12 | 0.25~0.50 | 0.30 | 0.050 | 0.045 | F、b、Z | General bridges, building structures, general mechanical parts, such as screws, nuts, etc. |
Q215 | A | 0.09~0.15 | 0.25~0.55 | 0.30 | 0.050 | 0.045 | F、b、Z | |
B | 0.045 | |||||||
Q235 | A | 0.14~0. 22 | 0.30~0.65 | 0.30 | 0.050 | 0.045 | F、b、Z | |
B | 0.12~0.20 | 0.30~0.70 | 0.045 | |||||
C | ≤ 0.18 | 0.35~0.80 | 0.040 | 0.040 | Z | |||
D | ≤ 0.17 | 0.035 | 0.035 | TZ | ||||
Q255 | A | 0.18~0.28 | 0.40~0.70 | 0.30 | 0.050 | 0.045 | F、b、Z | It can be used for mechanical parts with large force, such as sprockets, tie rods, etc. |
B | 0.045 | |||||||
Q275 | - | 0.28~0.38 | 0.50~0.80 | 0.35 | 0.050 | 0.045 | b、Z | |
What is carbon steel round bar?
Carbon steel round bar is a solid long steel bar with a circular cross-section. Its specifications are expressed in diameter in millimeters (mm). The calculation formula of theoretical weight of round steel: outer diameter Х outer diameter Х0.00617=kg/m. Round bars are divided into three types: hot rolled round bars, forged round bars and cold drawn round bars according to the process section. According to the chemical composition (ie carbon content), it can be divided into low carbon steel round steel, medium carbon steel round steel and high carbon steel round steel. According to the quality of steel, it can be divided into ordinary carbon steel round steel and high-quality carbon steel round steel. According to the use, it can be divided into carbon structural steel and carbon tool steel.
Carbon steel bars are widely used in machinery manufacturing, construction and bridges, ships and rail transportation, tool manufacturing
Classification of carbon steel:
According to the application, carbon steel can be divided into three categories: carbon structural steel, carbon tool steel and free-cutting structural steel. Carbon structural steel can be divided into building structural steel and machine-made structural steel. According to the carbon content, carbon steel can be divided into low carbon steel (ωc≤0.25%), medium carbon steel (ωc=0.25%-0.6%) and high carbon steel (ωc>0.6%)
