Straightness. Square and rectangular Steel tubes EN 10305-5

EN 10305-5 is a European standard that specifies the technical delivery conditions for welded and cold-sized square and rectangular steel tubes for precision applications. These tubes are designed for use in mechanical engineering and are intended for applications where dimensional accuracy and high surface quality are important.

The straightness of square and rectangular steel tubes is an important characteristic that determines their suitability for use in precision applications. Straightness refers to the deviation of the tube from a straight line when measured along its length. The EN 10305-5 standard specifies the maximum allowable deviation from straightness for square and rectangular steel tubes.

The maximum allowable deviation from straightness is expressed in terms of a maximum bow and a maximum sweep. The maximum bow is the distance between the centerline of the tube and a straight line drawn between the two ends of the tube. The maximum sweep is the distance between the two ends of the tube and a straight line drawn between them.

The EN 10305-5 standard specifies that the maximum allowable deviation from straightness for square and rectangular steel tubes is 0.3% of the total tube length or 1.5 mm, whichever is the greater. This means that if the tube is 1000 mm long, the maximum allowable deviation from straightness is 3 mm.

In addition to straightness, the EN 10305-5 standard specifies other characteristics for square and rectangular steel tubes, including dimensional tolerances, surface quality, and mechanical properties. These tubes are made from low carbon steel and are cold-formed by a process that involves drawing the tube through a series of dies. This process results in a tube with a precise size and shape that meets the dimensional tolerances specified in the standard.

Overall, the EN 10305-5 standard provides a detailed specification for square and rectangular steel tubes used in precision applications, including specific requirements for straightness that ensure the tubes meet the high standards required for mechanical engineering applications.

Surface condition. Square and rectangular Steel tubes EN 10305-5

EN 10305-5 is a European standard that specifies the technical delivery conditions for square and rectangular steel tubes for precision applications. The standard applies to welded or seamless tubes with a square or rectangular cross-section and a wall thickness up to 3mm.

The surface condition of the tubes is an important aspect that affects their performance in various applications. EN 10305-5 provides detailed descriptions of surface conditions for square and rectangular steel tubes, which are summarized below:

1. Natural surface – This is the default surface condition, where the tube is delivered with the surface as produced by the manufacturing process. The surface may have minor imperfections, such as scratches, pits, or minor rust, which do not affect the tube's performance.
2. Untreated surface – This surface condition is similar to the natural surface but with additional rust or oxide layers. The surface may have a slightly rough texture due to the presence of these layers.
3. Oiled surface – The tube is coated with oil to prevent corrosion during transportation and storage. The oil film is thin and easily removable with solvents or detergents.
4. Phosphated surface – The tube is treated with a phosphate coating to improve its corrosion resistance and enhance its bonding with paints or other coatings. The coating is usually thin and uniform, with a slightly rough texture.
5. Zinc-plated surface – The tube is coated with a thin layer of zinc to improve its corrosion resistance. The coating may be bright or dull, depending on the manufacturing process.
6. Chromium-plated surface – The tube is coated with a thin layer of chromium to improve its corrosion resistance and enhance its aesthetic appeal. The coating may be bright or dull, depending on the manufacturing process.
7. Anodized surface – The tube is treated with an anodizing process, where the surface is coated with a layer of aluminum oxide to improve its corrosion resistance and enhance its decorative appearance. The coating may be colored or clear.

The surface condition of square and rectangular steel tubes is specified by a letter code, which indicates the surface treatment applied to the tube. The code is followed by a number, which indicates the degree of surface roughness. The higher the number, the smoother the surface.

Mechanical properties. Square and rectangular Steel tubes EN 10305-5

EN 10305-5 specifies the technical delivery conditions for welded and cold sized steel square and rectangular tubes for precision applications. The mechanical properties of these tubes are described below:

1. Tensile Strength: The minimum tensile strength of square and rectangular steel tubes is 420 MPa.
2. Yield Strength: The minimum yield strength of square and rectangular steel tubes is 355 MPa.
3. Elongation: The minimum elongation of square and rectangular steel tubes is 22% for a gauge length of 50 mm.
4. Impact Strength: The minimum impact strength of square and rectangular steel tubes is 27 J at 0°C.
5. Hardness: The maximum hardness of square and rectangular steel tubes is 170 HV.
6. Dimensional Tolerance: The dimensional tolerance of square and rectangular steel tubes is specified in the EN 10305-5 standard.
7. Straightness: The maximum deviation from straightness for square and rectangular steel tubes is 1 mm per meter of length.
8. Surface Condition: The surface of square and rectangular steel tubes should be smooth and free from defects that could affect the performance of the tube.
9. Welding Properties: The welding properties of square and rectangular steel tubes should be such that they can be welded without any adverse effects on the mechanical properties.
10. Internal Cleanliness: The internal cleanliness of square and rectangular steel tubes should be such that there are no visible defects that could affect the performance of the tube.

Testing. Square and rectangular Steel tubes EN 10305-5

EN 10305-5 is a European standard that specifies the technical delivery conditions for welded and cold-sized square and rectangular steel tubes for precision applications. When testing square and rectangular steel tubes according to EN 10305-5, the following detailed description testing should be considered:

1. Chemical Composition Testing: The chemical composition of the steel used to manufacture the square and rectangular tubes must be tested to ensure that it meets the requirements specified in the standard.
2. Mechanical Testing: The mechanical properties of the square and rectangular tubes must be tested, including tensile strength, yield strength, elongation, and hardness.
3. Dimensional Testing: The dimensions of the square and rectangular tubes must be tested to ensure that they comply with the tolerances specified in the standard. This includes testing the outside dimensions, wall thickness, and length of the tubes.
4. Surface Quality Testing: The surface of the square and rectangular tubes must be inspected for defects such as scratches, dents, and other imperfections that could affect the performance of the tubes.
5. Non-destructive Testing: Non-destructive testing such as ultrasonic testing and eddy current testing can be used to detect any internal defects in the square and rectangular tubes.
6. Visual Inspection: A visual inspection should be conducted to check for any defects that are visible to the naked eye, such as cracks, corrosion, or deformation.
7. Flattening Testing: The square and rectangular tubes should be tested for flattening to ensure that they can withstand the specified compressive loads without deformation.
8. Bending Testing: The square and rectangular tubes should be tested for bending to ensure that they can withstand the specified bending loads without deformation.
9. Impact Testing: Impact testing can be conducted to assess the toughness of the square and rectangular tubes, and to ensure that they can withstand sudden shocks or impacts.

By performing these detailed testing, it can ensure that the square and rectangular tubes conform to the standards and meet the requirements for their intended applications.

Marking and packaging. Square and rectangular Steel tubes EN 10305-5

EN 10305-5 specifies the technical delivery conditions for welded and cold sized square and rectangular steel tubes for precision applications. The marking and packaging requirements for these tubes are as follows:

1. Marking:

• Each tube shall be marked with the following information:
  • Manufacturer's name or trademark
  • Tube type (square or rectangular)
  • Dimensions: outside diameter (OD) x wall thickness (WT) x length (L)
  • Steel grade
  • Heat number
  • EN 10305-5
  • Batch number or identification number
• The marking shall be legible and indelible and shall be applied by any suitable method.

2. Packaging:

• Tubes shall be bundled with steel straps or in cardboard boxes or crates.
• The bundles or boxes shall be securely fastened and adequately protected against damage during transportation.
• The maximum weight of each bundle shall not exceed 5,000 kg.
• Each bundle or box shall be marked with the following information:
  • Manufacturer's name or trademark
  • Tube type (square or rectangular)
  • Dimensions: outside diameter (OD) x wall thickness (WT) x length (L)
  • Steel grade
  • Heat number
  • EN 10305-5
  • Batch number or identification number
  • Number of pieces in the bundle or box
  • Gross and net weight of the bundle or box
  • Destination
• The packaging shall be designed to ensure that the tubes are protected against damage and corrosion during storage and transportation.

Supplier. Square and rectangular Steel tubes EN 10305-5

TAP Viet Nam International Investment Joint Stock Company, commonly known as TAP Viet Nam, is a renowned supplier of square and rectangular steel tubes. The company specializes in the manufacturing of steel tubes that meet the EN 10305-5 standard, which is the European standard for cold-drawn welded tubes.

Founded in 2010, TAP Viet Nam has quickly established itself as a leading supplier of steel tubes in Vietnam and has also expanded its operations globally. The company is committed to providing high-quality steel tubes that meet the diverse needs of its customers across various industries.

TAP Viet Nam's square and rectangular steel tubes are produced using the latest technology and equipment, ensuring that they meet the highest standards of quality and durability. The tubes are made from high-quality steel that is sourced from trusted suppliers, and they undergo rigorous quality control measures to ensure that they meet the required specifications.

The square and rectangular steel tubes supplied by TAP Viet Nam are used in a wide range of applications, including construction, manufacturing, and transportation. The tubes are ideal for use in the construction of buildings, bridges, and other structures, as well as in the manufacturing of machinery and equipment. They are also commonly used in the transportation industry for the production of trailers and other vehicles.

In addition to its commitment to quality, TAP Viet Nam is also dedicated to providing excellent customer service. The company has a team of experienced professionals who are always on hand to assist customers with their inquiries and provide expert advice on the best solutions for their needs. TAP Viet Nam also offers flexible payment and delivery options to ensure that customers receive their orders on time and in the most convenient manner.

TAP Viet Nam's commitment to quality and customer service has earned it a reputation as a trusted supplier of steel tubes in Vietnam and around the world. The company continues to invest in its operations and expand its product range to meet the evolving needs of its customers. With its focus on quality, innovation, and customer satisfaction, TAP Viet Nam is poised to remain a leader in the steel tube industry for years to come.