Carbon Steel

Carbon Steel Round Bar Key attributes

Industry-specific attributes

Standard	ASTM
Grade	S235JR-S335JR Series
Type	Equal
Tolerance	±1%
Invoicing	by actual weight

Other attributes

Place of Origin	Shandong, China
Alloy Or Not	Alloy
Delivery Time	8-14 days
Brand Name	Kehuan
Model Number	S355JR S235JR
Application	Structural Framing Architectural Projects Marine Engineering Chemical Industry Food Processing Equipment High-Corrosion Environments
Processing Service	Bending, Welding, Punching, Cutting
Product name	Steel Angle Bar
Shape	Equal Angle Bar
Technique	Hot RolllHot Rolled/ Cold Drawn/ Forged
Keywords	Angel Steel Bar
Standard	ASTM A36/A108/A576、DIN EN 10083、JIS G3101
Surface	Mild Steel Plain
Material	ASTM A36/SAE 1020/1045/DIN EN 10025 S235JR/S355JR/SS400
Surface treatment	Customers’s Requirements
Item	Stainless steel
Length	6m-12m

Specification

item	value
Place of Origin	China
	Shandong
Brand Name	Kehuan
Application	Fluid Pipe, Drill Pipe, Gas Pipe, OIL PIPE, Structure Pipe
Alloy Or Not	Non-Alloy
Section Shape	Round
Special Pipe	API Pipe, Thick Wall Pipe
Thickness	0.8 – 30 mm
Standard	ASTM
Length	12M, 6m
Certificate	API, CE, JIS, GS, ISO9001
Grade	Q195/Q215/Q235/Q345, GR.A/B, S235/S355
Surface Treatment	Brushed（拉丝） Polished（抛光） Mirror Finished（镜面） Pickled（酸洗） Passivated（钝化） Customers’ Requirements（定制处理）
Tolerance	±1%
Processing Service	Bending, Welding, Punching, Cutting
Oiled or Non-oiled	Non-oiled
Invoicing	by actual weight
Delivery Time	14-21days
Standard	GB 5310-1995
Product name	Carbon Steel Round Bar
Material	ST37/ST45/ST52/25Mn/27SiMn/E355/SAE1026/STKM13C
Type	Carbon Steel Round Bar
Surface	Carbon Steel Round Bar
Shape	Round Pipe Tube
Usage	Construction Structure
Technique	Cold Rolled Hot Rolled
Keyword	Carbon Steel Round Bar
Payment  terms	T/T

What is Carbon Steel Round Bar?

Carbon Steel Round Bar refers to a long, solid steel product with a circular cross-section, primarily made of carbon steel. It consists of iron with carbon as the main alloying element (typically 0.05%–1.35%), and may contain trace elements like manganese, silicon, sulfur, and phosphorus. Its mechanical properties, such as strength and hardness, are influenced by carbon content, making it suitable for various machining and structural applications due to its good comprehensive performance and cost-effectiveness.

Manufacturing Process of Carbon Steel Round Bar

The manufacturing process of Carbon Steel Round Bar generally involves the following key steps, which are systematically carried out to transform raw materials into the final product with specified properties and dimensions1. Raw Material PreparationSteelmaking MaterialsPrimary raw materials include iron ore, scrap steel, and alloying elements (e.g., carbon, manganese, silicon). The composition is carefully controlled to meet the required carbon steel grade (e.g., low-carbon, medium-carbon, or high-carbon steel). Melting: Raw materials are melted in a furnace (such as an electric arc furnace or basic oxygen furnace) at high temperatures to form molten steel. Chemical reactions during melting remove impurities and adjust the carbon and alloy content. 2. Steel Refining and Alloying** – **Purification**: Impurities like sulfur, phosphorus, and gases (e.g., oxygen, nitrogen) are removed through refining processes (e.g., ladle refining or vacuum degassing) to improve steel quality. – **Alloy Addition**: Specific elements (e.g., manganese for strength, silicon for deoxidation) are added to achieve the desired mechanical properties. 3. Casting into Semi-finished Products** – **Continuous Casting**: Molten steel is poured into a continuous casting machine, where it solidifies into large cylindrical billets or blooms. This method is efficient for producing uniform cross-sections. – **Ingot Casting (Less Common)**: Molten steel is poured into ingot molds, cooled, and then processed into billets through forging or rolling. 4. Hot Rolling ProcessHeating: Billets or blooms are heated in a reheating furnace to a temperature range (typically 1,100–1,300°C) where steel is plastic and easy to deform. – **Rough Rolling**: The heated billet is passed through rolling mills with gradually smaller rolls to reduce its diameter and increase its length. This step shapes the steel into a round cross-section. – **Finish Rolling**: The bar is further rolled through precision mills to achieve the target diameter and surface finish. Cooling systems may be used to control microstructure and mechanical properties (e.g., to prevent excessive hardness). 5. Cooling and Straightening** – **Air Cooling**: After hot rolling, the bar is cooled in the open air to room temperature, which allows the steel to achieve a stable microstructure. – **Straightening**: The cooled bar may be bent due to uneven cooling. It is passed through a straightening machine to ensure dimensional accuracy. ### **6. Surface Treatment (Optional)** – **Hot-rolled Surface**: The bar may retain a rough, scale-covered surface from hot rolling, suitable for applications where surface finish is less critical. – **Cold Drawing (for Higher Precision)**: For better surface quality and tighter tolerances, the bar is pulled through dies at room temperature (cold drawing), which reduces diameter, improves surface smoothness, and increases strength. – **Shot Blasting or Pickling**: Scales and oxides on the surface can be removed by shot blasting or pickling with acids to prepare the bar for further processing or coating. ### **7. Cutting to Length** – The bar is cut into specified lengths using saws or shears, depending on customer requirements (e.g., standard lengths or custom sizes). ### **8. Quality Inspection** – **Dimensional Check**: Diameter, length, and straightness are measured to ensure compliance with standards (e.g., ASTM, ISO). – **Mechanical Testing**: Samples are tested for tensile strength, yield strength, hardness, and ductility to verify mechanical properties. – **Non-destructive Testing (NDT)**: Methods like ultrasonic or magnetic particle inspection are used to detect internal or surface defects (e.g., cracks, inclusions). ### **9. Packaging and Delivery** – The finished bars are bundled, labeled with specifications (grade, diameter, length), and packaged to prevent damage during transportation. ### **Key Process Variations** – **Cold Rolling/ Drawing**: Used for higher-precision bars with improved surface finish and dimensional accuracy, though it may reduce ductility. – **Heat Treatment**: Post-rolling heat treatment (e.g., annealing, quenching, tempering) can adjust hardness, toughness, and strength for specific applications (e.g., gears, shafts). This process ensures that Carbon Steel Round Bar meets the mechanical and dimensional requirements for diverse uses in construction, machinery, and manufacturing.

Advantages of Angle steel

• High structural strength
• The cross-section of Angle steel is right-angled. This structure endows it with high bending strength and rigidity in both directions, enabling it to withstand large loads and making it suitable for structures that need to bear complex stresses.
• Good stability
• Due to the symmetry of its cross-sectional shape, Angle steel is not prone to twisting or deformation under force and has good stability, which can be used to construct stable frame structures.
• Convenient for processing
• Angle steel can be conveniently processed by cutting, drilling, welding and other operations, and is easy to be customized and assembled according to the actual engineering requirements, which can greatly improve the construction efficiency.
• Wide application range
• It can be used in multiple fields such as steel structure frames in construction projects, bridge construction, brackets and support structures in mechanical manufacturing, towers and brackets in power engineering, shipbuilding, and the manufacturing of various industrial equipment.
• Good economy
• The production process of Angle steel is relatively mature, with a low production cost and a high cost performance. Under the premise of meeting the engineering strength and usage requirements, it can save costs for the project.
• Diverse varieties and specifications
• There are various side lengths, thicknesses and materials to choose from. Users can select the appropriate Angle steel specifications based on specific usage scenarios and requirements, offering high flexibility.

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