1. Material Standards & Grades

Primary Standard:

• ASTM A53 - Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless

Available Grades:

2. Chemical Composition (% by weight, Base Steel)

3. Mechanical Properties

4. Galvanized Coating Specifications

Coating Requirements:

Coating Quality Tests:

• Zinc coating adherence test

• Coating uniformity test

• Sulfate copper test

• Visual inspection

5. Physical Properties

6. Product Specifications

7. Manufacturing Process

Production Steps:

• Steel strip uncoiling and leveling

• Cold forming into square shape

• High-frequency welding (ERW)

• Weld seam treatment and testing

• Sizing and straightening

• Hot-dip galvanizing (445-465°C)

• Cooling and final inspection

Process Control Parameters:

• Welding temperature: 1300-1400°C

• Galvanizing temperature: 445-465°C

• Zinc bath composition control

• Cooling rate control

8. Testing & Inspection

Mandatory Tests:

• Hydrostatic test (ASTM A53)

• Flattening test (ASTM A53)

• Bend test

• Zinc coating test (ASTM A53)

• Visual inspection

• Dimensional inspection

• Weld seam inspection

Optional Tests:

• Salt spray test (ASTM B117)

• Chemical analysis

• Tensile test

• Hardness test

• Third-party inspection

9. Applications

Structural Applications:

• Building frameworks and supports

• Fencing and gate structures

• Handrails and guardrails

• Scaffolding systems

• Structural trusses

Industrial Applications:

• Machinery guards and frames

• Conveyor system supports

• Storage rack systems

• Agricultural equipment frames

• Industrial work platforms

Commercial Applications:

• Retail display systems

• Furniture manufacturing

• Exhibition structures

• Signage supports

• Decorative architectures