Overview and Definition of Bar Materials

Bar materials, also known as rolled steel products, are long, slender metallic materials processed by rolling mills in steel factories. They typically have circular or square cross-sections and lengths ranging from several meters to tens of meters. Bar materials are commonly made from metals such as steel, iron, copper, and aluminum. Due to their significant ratio of length to cross-sectional perimeter and lack of pronounced protrusions or indentations in the cross-section, they are also referred to as simple section profiles.

Applications of Bar Materials

Bar materials have a wide range of applications across multiple industries:

  1. Construction Industry: Used primarily for reinforcing concrete structures, partition walls, load-bearing columns, stairway handrails, etc. In construction, metal bar materials can also be used as tie bars to reinforce the structure as a whole.
  2. Power Industry: Used for manufacturing transmission towers, power poles, transformers, and conductors. These products require resistance to high temperatures, corrosion, and high strength, which metal bar materials can provide.
  3. Machinery Manufacturing: Used for producing bearings, gears, screws, and other mechanical parts. Metal bar materials with different shapes and sizes can meet various precision and load requirements, enabling smoother operation of machinery.
  4. Automotive Parts: Used for manufacturing axles, steering rods, crankshafts, and other components. Since vehicles operate in high-speed, high-strength, high-temperature, and vibrating environments, strict requirements are placed on the material and manufacturing process of bar materials.

Classification of Bar Materials

Bar materials can be classified based on their material, shape, and application:

  1. Classification by Material:
    • Steel bars: The most common type, including ordinary carbon steel bars, alloy steel bars, stainless steel bars, etc.
    • Other metal bars such as aluminum bars and copper bars.
  2. Classification by Shape:
    • Round steel bars
    • Square steel bars
    • Flat steel bars
    • Angle steel bars, etc.
  3. Classification by Application:
    • Construction steel bars
    • Machinery manufacturing steel bars
    • Shipbuilding steel bars
    • Automotive manufacturing steel bars, etc.

Common Steel Grades of Bar Materials

Common steel grades for bar materials include various types, such as:

  • Carbon steel bars: Including Q195, Q215, Q235, etc.
  • Alloy steel bars: Depending on the alloy elements and intended use, there are numerous grades, such as stainless steel bars commonly made from materials like 201, 202, 301, 304, 316, etc.