Material. Steel Tubes EN 10305-4

EN 10305-4 is a European standard for steel tubes that are used in hydraulic and pneumatic power systems. The standard specifies the technical delivery conditions for seamless cold-drawn tubes made of low-alloy carbon steel for hydraulic and pneumatic power systems.

There are several different steel names and numbers that are used for EN 10305-4 steel tubes, depending on the specific material properties and requirements. The most commonly used steel names and numbers for EN 10305-4 steel tubes are:

1. E235 (1.0308) – This is a non-alloy steel with a maximum carbon content of 0.17% and a minimum yield strength of 235 N/mm². It is often used in hydraulic and pneumatic systems where a high degree of precision is required.
2. E355 (1.0580) – This is a low-alloy steel with a maximum carbon content of 0.22% and a minimum yield strength of 355 N/mm². It is commonly used in hydraulic and pneumatic systems where high pressures and loads are present.
3. E410 (1.0509) – This is a low-alloy steel with a maximum carbon content of 0.15% and a minimum yield strength of 410 N/mm². It is used in applications where high precision and strength are required, such as in the manufacturing of hydraulic cylinders.
4. E470 (1.0536) – This is a low-alloy steel with a maximum carbon content of 0.20% and a minimum yield strength of 470 N/mm². It is commonly used in applications where high precision, strength, and toughness are required, such as in the manufacturing of heavy-duty hydraulic cylinders.
5. E275K2 (1.0521) – This is a non-alloy steel with a maximum carbon content of 0.21% and a minimum yield strength of 275 N/mm². It is used in applications where high precision and strength are required, such as in the manufacturing of precision hydraulic components.

All of these steel names and numbers have specific material properties that make them suitable for use in different hydraulic and pneumatic applications. When selecting a steel tube for a specific application, it is important to consider the required strength, precision, and toughness, as well as any other specific requirements of the application.

Manufacturing process. Steel Tubes EN 10305-4

EN 10305-4 is a European standard that specifies the technical delivery conditions for seamless cold drawn steel tubes of circular cross section for hydraulic and pneumatic power systems. The manufacturing process of steel tubes under this standard involves several steps as outlined below:

1. Raw material selection: The raw material used for making steel tubes under EN 10305-4 is typically low carbon steel, which is selected based on its chemical composition and mechanical properties.
2. Heating: The raw material is heated to a temperature of around 1200°C in a furnace. This process is known as the "hot working" stage and is necessary to make the material malleable for subsequent processing.
3. Piercing: The heated steel billet is then pierced to form a hollow tube, using a piercing machine. The piercing process involves forcing a pointed mandrel through the center of the heated billet.
4. Cold drawing: The hollow tube is then drawn through a series of dies, with each successive die reducing the tube's diameter and increasing its length. The cold drawing process is carried out at room temperature and imparts the final dimensions and surface finish to the tube.
5. Annealing: After cold drawing, the tube is annealed to improve its ductility and toughness. The tube is heated to a temperature of around 900°C in a furnace and then cooled slowly to room temperature.
6. Straightening and cutting: The annealed tube is then straightened and cut to the required length.
7. Inspection and testing: The finished tube is inspected and tested to ensure that it meets the specifications outlined in EN 10305-4. Tests include dimensional checks, surface finish, mechanical properties, and chemical composition analysis.
8. Packing and shipping: The finished tubes are packed in bundles or wooden boxes, and shipped to customers.

Overall, the manufacturing process for steel tubes under EN 10305-4 involves several stages of heating, piercing, cold drawing, annealing, straightening, cutting, inspection, and testing. These steps ensure that the finished product meets the necessary quality standards and can be used in hydraulic and pneumatic power systems with confidence.

Surface condition. Steel Tubes EN 10305-4

EN 10305-4 is a European standard that specifies the technical delivery conditions for seamless cold-drawn steel tubes of circular cross-section for precision applications. The standard covers a range of different surface conditions for these tubes, which are described below:

1. Untreated (oiled) surface: This is the default surface condition for EN 10305-4 tubes. The tubes are coated with a thin layer of oil to protect against corrosion during storage and transportation.

2. Phosphated surface: This surface condition involves the application of a thin layer of phosphate coating to the tube surface. The phosphate coating provides improved corrosion resistance and a better surface for subsequent painting or other surface treatments.

3. Zinc-plated surface: Zinc plating involves the application of a thin layer of zinc to the tube surface. The zinc provides enhanced corrosion resistance and is often used in applications where the tubes will be exposed to harsh environments.

4. Chromium VI-free passivated surface: This surface condition involves the removal of any residual chromium VI from the tube surface, followed by passivation using a chromium-free solution. This process provides improved corrosion resistance without the environmental risks associated with chromium VI.

5. Chromium VI-free passivated and oiled surface: This is a combination of the passivated and oiled surface conditions. The tube surface is first passivated to provide improved corrosion resistance, and then coated with a thin layer of oil to protect against corrosion during storage and transportation.

It is important to note that the choice of surface condition for EN 10305-4 tubes will depend on the specific application and operating conditions. The manufacturer or supplier of the tubes should be consulted to determine the most appropriate surface condition for a given application.

Testing and inspection. Steel Tubes EN 10305-4

EN 10305-4 is a European standard that specifies the technical delivery conditions for seamless cold-drawn steel tubes of circular cross-section for hydraulic and pneumatic power systems. This standard is applicable to tubes with outside diameters from 4mm to 250mm and wall thicknesses from 0.5mm to 20mm.

Testing and inspection are critical steps in the manufacturing process of steel tubes to ensure their quality and safety. The following is a detailed description of testing and inspection requirements for steel tubes according to EN 10305-4:

1. Chemical composition analysis: The chemical composition of the steel used in the manufacture of tubes should comply with the requirements specified in the standard. A chemical analysis of the tube material is carried out using either an emission spectrometer or a mass spectrometer.

2. Mechanical properties testing: The mechanical properties of the tube are tested to ensure that they meet the specified requirements. The tests include tensile strength, yield strength, elongation, and hardness tests. These tests are carried out on samples of the tube material using universal testing machines.

3. Visual inspection: The tubes should be visually inspected for surface defects such as cracks, pits, scratches, and surface roughness. The inspection should be carried out in good light, and the inspector should use a magnifying glass if necessary.

4. Dimensional inspection: The tubes should be inspected to ensure that they meet the specified dimensional tolerances. This includes checking the outer diameter, inner diameter, wall thickness, and length of the tubes. The inspection is carried out using calibrated measuring instruments such as micrometers, Vernier calipers, and gauges.

5. Non-destructive testing: Non-destructive testing (NDT) methods are used to detect surface or internal defects that cannot be detected by visual inspection. The NDT methods specified in EN 10305-4 include eddy current testing, ultrasonic testing, and magnetic particle testing.

6. Hydraulic testing: The tubes should be subjected to a hydraulic pressure test to ensure that they are capable of withstanding the specified pressure without leaking or bursting. The test pressure is usually 5 times the maximum working pressure of the system in which the tube will be used.

7. Surface protection testing: If the tubes are supplied with a surface protection, such as zinc or phosphate coating, the adhesion and thickness of the coating should be tested.

In conclusion, testing and inspection are essential steps in ensuring the quality and safety of steel tubes. Manufacturers should ensure that all tubes comply with the testing and inspection requirements specified in EN 10305-4.

Marking and packaging. Steel Tubes EN 10305-4

EN 10305-4 is a European standard that specifies the technical delivery conditions for seamless cold-drawn steel tubes of circular cross-section for precision applications with specified outside diameter ranges. The standard covers various grades of steel and requires the tubes to be delivered in either normalized or normalized and tempered condition.

Marking: According to EN 10305-4, the following information should be marked on the steel tubes:

• Manufacturer's name or trademark
• Size and dimensional tolerances (outside diameter and wall thickness)
• Steel grade
• Heat number or cast number
• Batch or lot number
• CE marking (if applicable)
• Delivery condition (normalized or normalized and tempered)
• The symbol indicating the type of test report, as specified in EN 10204 (e.g. 2.2 or 3.1)

Packaging: Steel tubes according to EN 10305-4 are typically delivered in bundles or wooden crates. The packaging should be suitable for transportation and should protect the tubes from damage during handling and storage. Each bundle or crate should be labeled with the following information:

• Manufacturer's name or trademark
• Size and dimensional tolerances (outside diameter and wall thickness)
• Steel grade
• Heat number or cast number
• Batch or lot number
• Number of pieces or length of the bundle
• Delivery condition (normalized or normalized and tempered)

Additionally, the packaging should include a packing list indicating the content of each bundle or crate and the corresponding identification numbers.

Delivery condition. Steel Tubes EN 10305-4

EN 10305-4 is a European standard that specifies the technical delivery conditions for seamless cold drawn steel tubes for hydraulic and pneumatic power systems. The standard covers tubes with outside diameters from 4mm to 120mm and wall thicknesses from 0.5mm to 10mm.

The delivery condition of the steel tubes specified in EN 10305-4 is divided into four categories:

1. +C (BK): Cold drawn/soft This condition refers to tubes that have been cold-drawn and annealed. They have a maximum hardness of 170 HV (Vickers hardness) and are suitable for use in hydraulic and pneumatic systems where high ductility and a good surface finish are required.
2. +LC (BKW): Cold drawn/soft + stress relieved This condition refers to tubes that have been cold-drawn and then subjected to a stress-relieving treatment. The treatment involves heating the tubes to a temperature of around 650°C and then allowing them to cool slowly. This process reduces residual stresses in the tubes and improves their dimensional stability. Tubes in this condition have a maximum hardness of 170 HV and are suitable for use in applications where a high degree of dimensional accuracy is required.
3. +SR (BKS): Cold drawn/stress relieved This condition refers to tubes that have been cold-drawn and then subjected to a stress-relieving treatment. The treatment involves heating the tubes to a temperature of around 650°C and then allowing them to cool slowly. This process reduces residual stresses in the tubes and improves their dimensional stability. Tubes in this condition have a maximum hardness of 200 HV and are suitable for use in applications where a high degree of dimensional accuracy is required.
4. +A (GBK): Annealed This condition refers to tubes that have been fully annealed. The annealing process involves heating the tubes to a temperature of around 900°C and then allowing them to cool slowly. This process removes any residual stresses in the tubes and softens them, making them easier to form and machine. Tubes in this condition have a maximum hardness of 130 HV and are suitable for use in applications where a high degree of formability is required.

In summary, the delivery condition of steel tubes specified in EN 10305-4 includes cold drawn/soft, cold drawn/soft + stress relieved, cold drawn/stress relieved, and fully annealed. Each condition has its own characteristics and is suitable for different applications in hydraulic and pneumatic systems.

Application. Steel Tubes EN 10305-4

Steel tubes EN 10305-4 is a European standard that specifies the technical delivery conditions for seamless cold-drawn steel tubes of circular cross-section for precision applications. The standard covers tubes made from non-alloy steel, such as E235, E255, E355, as well as fine-grain steel, such as E355K2, E420J2H, and E460N.

The main purpose of EN 10305-4 steel tubes is to provide precise dimensional accuracy, high surface quality, and mechanical properties suitable for various industrial applications. These tubes are typically used in hydraulic and pneumatic power systems, automotive industry, and mechanical engineering, where precision and reliability are crucial.

The standard specifies the dimensions, tolerances, and technical requirements for the manufacturing of seamless cold-drawn precision steel tubes. The tubes are produced by cold-drawing a solid steel bar or billet through a die to obtain the desired dimensions and surface finish.

The steel tubes are classified into two groups based on their surface conditions: group 1 with a smooth surface (BK) and group 2 with a rough surface (BKW). The tubes in group 1 are suitable for applications where a smooth surface is essential, such as hydraulic and pneumatic systems, while tubes in group 2 are typically used for mechanical applications where a higher roughness is acceptable.

EN 10305-4 steel tubes are tested according to various mechanical and non-destructive testing methods, such as tensile testing, flaring and flattening testing, eddy current testing, and ultrasonic testing. The tubes are also subjected to various surface treatments, such as phosphating, zinc coating, and blackening.

In conclusion, EN 10305-4 steel tubes are high-quality seamless cold-drawn precision tubes used in various industrial applications where precision, reliability, and mechanical properties are essential. The standard provides detailed technical specifications and testing procedures to ensure the tubes meet the required quality standards.

Supplier. Steel Tubes EN 10305-4

TAP Viet nam International Investment Joint Stock Company (TAP Viet nam) is a well-known supplier of steel tubes in Vietnam. The company specializes in supplying steel tubes that meet the EN 10305-4 standard. This standard specifies the technical delivery conditions for seamless cold drawn steel tubes of circular cross-section for precision applications.

TAP Viet nam's commitment to quality and customer satisfaction is evident in their extensive range of products, which includes steel tubes of various sizes and shapes. The company's steel tubes are widely used in a variety of industries, including automotive, mechanical engineering, and construction.

One of the key advantages of TAP Viet nam's steel tubes is their precision and durability. The cold drawn process used to manufacture these tubes ensures that they have a consistent diameter and wall thickness, making them ideal for precision applications. Additionally, the use of high-quality materials ensures that these tubes are strong and long-lasting, even in harsh environments.

TAP Viet nam's dedication to quality is further demonstrated by their rigorous testing procedures. Before any product is shipped to a customer, it undergoes a series of quality checks to ensure that it meets the company's high standards. These checks include visual inspections, dimensional checks, and mechanical tests.

In addition to their commitment to quality, TAP Viet nam also prioritizes sustainability. The company uses environmentally friendly production methods and materials to minimize their impact on the environment. This includes the use of recycled materials and the implementation of energy-saving technologies.

TAP Viet nam's reputation as a trusted supplier of steel tubes is well-established in the industry. The company's extensive experience and expertise in the field, combined with their commitment to quality and sustainability, make them a top choice for customers in Vietnam and beyond.

In conclusion, TAP Viet nam International Investment Joint Stock Company is a reliable supplier of steel tubes that meet the EN 10305-4 standard. With their commitment to quality, customer satisfaction, and sustainability, the company has established itself as a leading provider of precision steel tubes in Vietnam and beyond.