Application of Hot Rolled Steel Coils in the Machinery Manufacturing Industry

Introduction

Hot rolled steel coils are a type of steel sheet that is heated above the recrystallization temperature and then rolled to shape. Hot rolled steel coils are widely used in the machinery manufacturing industry due to their high strength, good toughness, excellent wear resistance, good processability, good weldability, and low cost.

Common Grades and Standards of Hot Rolled Steel Coils

Commonly used grades of hot rolled steel coils include Q235B, Q345B, Q420B, and others. The chemical composition and mechanical properties of these grades of hot rolled steel coils comply with the GB/T 700 standard.

Characteristics of Hot Rolled Steel Coils

  1. Q235B Hot Rolled Steel Coils

Chemical Composition:

  • Carbon: 0.14% – 0.22%
  • Manganese: 0.30% – 0.60%
  • Phosphorus: ≤0.040%
  • Sulfur: ≤0.050%
  • Silicon: ≤0.10%
  • Copper: ≤0.05%
  • Nickel: ≤0.05%
  • Chromium: ≤0.05%
  • Molybdenum: ≤0.05%
  • Vanadium: ≤0.05%
  • Titanium: ≤0.05%

Mechanical Properties:

  • Yield Strength: 235 MPa
  • Tensile Strength: 370 MPa
  • Elongation: 22%
  • Impact Toughness: 80 J
  1. Q345B Hot Rolled Steel Coils

Chemical Composition:

  • Carbon: 0.16% – 0.23%
  • Manganese: 0.50% – 0.80%
  • Phosphorus: ≤0.040%
  • Sulfur: ≤0.050%
  • Silicon: ≤0.10%
  • Copper: ≤0.05%
  • Nickel: ≤0.05%
  • Chromium: ≤0.05%
  • Molybdenum: ≤0.05%
  • Vanadium: ≤0.05%
  • Titanium: ≤0.05%

Mechanical Properties:

  • Yield Strength: 345 MPa
  • Tensile Strength: 470 MPa
  • Elongation: 20%
  • Impact Toughness: 60 J
  1. Q420B Hot Rolled Steel Coils

Chemical Composition:

  • Carbon: 0.18% – 0.25%
  • Manganese: 0.60% – 0.90%
  • Phosphorus: ≤0.040%
  • Sulfur: ≤0.050%
  • Silicon: ≤0.10%
  • Copper: ≤0.05%
  • Nickel: ≤0.05%
  • Chromium: ≤0.05%
  • Molybdenum: ≤0.05%
  • Vanadium: ≤0.05%
  • Titanium: ≤0.05%

Mechanical Properties:

  • Yield Strength: 420 MPa
  • Tensile Strength: 550 MPa
  • Elongation: 18%
  • Impact Toughness: 40 J

Application of Hot Rolled Steel Coils in the Machinery Manufacturing Industry

Hot rolled steel coils find extensive applications in the machinery manufacturing industry, including:

  • Manufacture of machinery parts: Hot rolled steel coils are used to manufacture various machinery parts such as gears, shafts, connecting rods, and springs.
  • Manufacture of machine tools: Hot rolled steel coils are used in the production of machine tool beds, columns, and worktables.
  • Manufacture of automotive components: Hot rolled steel coils are employed in the manufacturing of car bodies, chassis, frames, and other automotive components.
  • Manufacture of molds: Hot rolled steel coils are utilized in the production of various types of molds, including stamping molds, forging molds, and casting molds.
  • Manufacture of steel structures: Hot rolled steel coils are used in the fabrication of steel structures, such as building structures, bridge structures, and ship structures.

Advantages of Hot Rolled Steel Coils in the Machinery Manufacturing Industry

The advantages of hot rolled steel coils in the machinery manufacturing industry include:

  • High strength and good toughness: Hot rolled steel coils exhibit high strength and toughness, enabling them to withstand significant impact loads.
  • Excellent wear resistance: Hot rolled steel coils possess excellent wear resistance, making them suitable for applications requiring resistance to abrasion.
  • Good processability and weldability: Hot rolled steel coils can be easily processed and welded, allowing for efficient manufacturing and assembly processes.
  • Cost-effectiveness: Hot rolled steel coils offer a cost-effective solution due to their low production costs and availability.

Trends in the Application of Hot Rolled Steel Coils in the Machinery Manufacturing Industry

With the advancement of technology and the development of the machinery manufacturing industry, the application of hot rolled steel coils in this industry is expected to exhibit the following trends:

  • Development towards higher strength, toughness, and wear resistance: In order to meet the increasing demands for material performance in the machinery manufacturing industry, hot rolled steel coils will be developed towards higher strength, toughness, and wear resistance.
  • Development towards lightweighting: In order to improve efficiency and save energy in machinery, hot rolled steel coils will be developed towards lightweighting.
  • Development towards green manufacturing: In order to reduce environmental impact, hot rolled steel coils will be developed towards green manufacturing practices.

Conclusion

Hot rolled steel coils are one of the important raw materials in the machinery manufacturing industry. They possess advantages such as high strength, good toughness, excellent wear resistance, good processability, good weldability, and low cost, making them widely used in the machinery manufacturing industry. With the advancement of technology and the development of the machinery manufacturing industry, the application of hot rolled steel coils will trend towards higher strength, toughness, and wear resistance, lightweighting, and green manufacturing. Contact us for more.