Square Carbon Steel Bars

Square carbon steel bars are solid, square-sectioned steel products made from carbon steel. They are typically produced through hot rolling or cold drawing processes and may undergo further heat treatments to achieve desired mechanical properties. These bars are known for their excellent strength, toughness, and machinability, making them suitable for a wide range of applications.


Product NameCarbon Steel Square Bar
 ASME: 1005, 1006, 1008, 1010, 1015, 1020, 1025, 1030, 1035, 1040, 1045, 1050, 1055, 1060, 1065, 1070, 1080, 1084, 1016, 1022
MaterialDIN: Ck10,  Ck15,  Ck22,  Ck25,  Ck30,  Ck35,  Ck40,  Ck45,  Ck50,  30Mn4,  40Mn4
BS: 040A04, 095M15, 045M10, 080A40, 045M10, 080M50
GB: Q195,  Q235, Q345
Place of OriginShandong,China
Size4mm*4mm~~100mm*100mm, or as per requirements
Length2M,4M,5.8M,6M,11.8M,12M or as required
GradeQ295, Q345, Q390, Q420, Q460
Spring Steel65Mn, 60Si2Mn, 50CrVA
Bearing SteelGCr15, GCr15GD,55SiMoV
Packing1.plastic cap with both ends 2.Coated with anti-rust oil 3.bundle package 4.wooden case package 5.container or bulk 6. special according to customer request
Applicationgeneral purpose structural and mechanical applications
Used for reinforcing products such as bracing, frames or brackets are also common
used for general repairs on factory equipment and railings
decorative ironwork, protective barriers on gates and windows

Typical Chemistry:

The chemical composition of square carbon steel bars can vary depending on the specific grade, but generally includes:

  • Carbon (C): 0.05% to 0.30%
  • Manganese (Mn): 0.30% to 1.65%
  • Silicon (Si): 0.10% to 0.50%
  • Phosphorus (P): ≤ 0.05%
  • Sulfur (S): ≤ 0.05%
  • Additional Elements: Trace amounts of elements like copper (Cu), chromium (Cr), molybdenum (Mo), and nickel (Ni) to enhance specific properties.

Physical Properties:

The physical properties of square carbon steel bars depend on the grade and manufacturing process but typically include:

  • Tensile Strength: 400 MPa to 800 MPa.
  • Yield Strength: 250 MPa to 600 MPa.
  • Elongation: 15% to 25%, indicating good ductility.
  • Hardness: Generally between 120-180 HB (Brinell hardness).
  • Density: Approximately 7.85 g/cm³.
  • Thermal Conductivity: Around 50 W/m·K.
  • Modulus of Elasticity: Approximately 210 GPa.


Square carbon steel bars are produced according to various standards to ensure quality and performance:

  • ASTM A36: Standard specification for carbon structural steel.
  • ASTM A108: Standard specification for steel bar, carbon and alloy, cold-finished.
  • EN 10025: European standard for hot-rolled structural steel.
  • JIS G3101: Japanese standard for general structural steel.
  • ISO 630: International standard for structural steels.


Key features of square carbon steel bars include:

  • High Strength: Capable of withstanding high stress and loads, making them suitable for structural applications.
  • Good Ductility: Can be bent and formed into various shapes without breaking, providing flexibility in design and fabrication.
  • Versatility: Suitable for a wide range of applications across different industries, from construction to automotive to manufacturing.
  • Durability: Resistant to wear and tear, ensuring long service life even under demanding conditions.
  • Cost-Effectiveness: Generally cheaper than alloy and stainless steel bars, offering good value for money.
  • Weldability: Can be easily welded, allowing for strong and secure joints in structures and machinery.
  • Machinability: Can be easily cut, drilled, and machined to required dimensions, facilitating ease of use in various manufacturing processes.
  • Surface Finish: Available in various finishes (hot-rolled, cold-drawn, forged) to meet specific aesthetic and functional requirements.

Our Certifications

Packaging and Shipping

1. Wood pallet packing cover with water-proof paper
2. Steel pallet packing cover with water-proof paper
3. Wood box packing
4. Steel pallet packing cover with steel box
5. In bundles with steel strip no extra packing

package and shipment


  • High Precision Dimension: The carbon steel profile has excellent processing technology good molding and easy welding. Thickened material, stable performance, and high hardness, not easy to rust.
  • Low Friction: Low dissipation factor. More durable than most ordinary domestic bearings. Lower operating costs​
  • Life Is Long: High-quality steel through strict quality inspection, quality control layer-by-layer detection, and reliable quality, long service life.
  • Customization: Drawings and samples can be processed and customized. Conventional large-scale spot, non-standard customization.
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