Welded cold drawn steel tubes EN 10305-6

Introduce. Welded cold drawn steel tubes EN 10305-6

EN 10305-6 is a European standard that specifies the technical delivery conditions for welded cold-drawn steel tubes for precision applications. This standard applies to welded cold-drawn precision steel tubes with special dimensional accuracy and surface quality requirements. These tubes are mainly used in hydraulic and pneumatic power systems, as well as in the automotive industry and other precision engineering applications.

The tubes covered by this standard are produced from hot-rolled or cold-rolled steel strip or sheet that is welded longitudinally by the high-frequency induction welding process. The welding process is followed by cold drawing to achieve the desired dimensional accuracy and surface finish.

The steel tubes specified in EN 10305-6 have a circular cross-section and are available in various dimensions, ranging from 4 mm to 120 mm in outside diameter and from 1 mm to 10 mm in wall thickness. The tubes are supplied in lengths of 6 meters or as cut lengths, and they may be supplied with a protective coating or without coating.

EN 10305-6 specifies various requirements for the chemical composition, mechanical properties, dimensional tolerances, and surface quality of the steel tubes. The chemical composition of the steel used in the production of these tubes must meet the specified requirements for elements such as carbon, manganese, phosphorus, sulfur, and silicon. The mechanical properties of the tubes are also specified, including requirements for tensile strength, yield strength, elongation, and impact strength.

In addition, EN 10305-6 specifies strict dimensional tolerances for the outside diameter, wall thickness, ovality, and straightness of the tubes. The standard also defines requirements for the surface quality of the tubes, including requirements for roughness, cleanliness, and surface defects such as scratches, pits, and rust.

Overall, EN 10305-6 ensures that welded cold-drawn steel tubes for precision applications are produced to meet strict dimensional and surface quality requirements, making them suitable for use in applications that require high precision and reliability.

Material. Welded cold drawn steel tubes EN 10305-6

The EN 10305-6 standard specifies the technical delivery conditions for welded cold drawn steel tubes of circular cross-section for hydraulic and pneumatic power systems. The standard includes a range of steel grades, each with a unique name and number. The steel grades are identified by a combination of letters and numbers that indicate their composition and properties.

Here are the steel grades specified in EN 10305-6 and their descriptions:

1. Steel name: E235. Steel number: 1.0308. This steel grade is a non-alloy steel with low carbon content and good cold-forming properties. It is characterized by its high strength and toughness, making it ideal for use in hydraulic and pneumatic systems.

2. Steel name: E355. Steel number: 1.0580. This steel grade is a non-alloy steel with high strength and good cold-forming properties. It is often used in hydraulic and pneumatic systems where high pressures and loads are encountered.

3. Steel name: E420. Steel number: 1.0575. This steel grade is a non-alloy steel with high strength and good cold-forming properties. It is often used in hydraulic and pneumatic systems where high pressures and loads are encountered.

4. Steel name: E470. Steel number: 1.0536. This steel grade is a low-alloy steel with high strength and good cold-forming properties. It is often used in hydraulic and pneumatic systems where high pressures and loads are encountered.

All of these steel grades have good weldability and can be easily welded using a variety of welding techniques. They are also suitable for use in a wide range of temperatures, making them ideal for use in hydraulic and pneumatic systems that operate in harsh environments.

Mechanical properties. Welded cold drawn steel tubes EN 10305-6

Steel tubes for welded cold drawn tubes EN 10305-6 are designed for mechanical applications, such as automotive, hydraulic and pneumatic systems, construction machinery, and agricultural equipment. These tubes are made from low carbon steel with a maximum carbon content of 0.22%.

The mechanical properties of steel tubes for welded cold drawn tubes EN 10305-6 are determined by the manufacturing process, which involves cold drawing and welding. The cold drawing process involves pulling the tube through a die to reduce its diameter and increase its length. This process results in a smooth and uniform surface finish with a high level of dimensional accuracy.

The welding process used to join the ends of the tube together is typically a high-frequency induction welding process. This process results in a weld that is strong and durable, with a minimum yield strength of 235 MPa.

The tensile strength of steel tubes for welded cold drawn tubes EN 10305-6 ranges from 340 to 480 MPa, depending on the diameter and thickness of the tube. The elongation at break of these tubes is typically between 10% and 25%, depending on the size and manufacturing process used.

In addition to these mechanical properties, steel tubes for welded cold drawn tubes EN 10305-6 are also tested for other properties, such as impact strength, hardness, and surface quality. These tests ensure that the tubes are suitable for their intended application and meet the required standards for safety and performance.

Overall, steel tubes for welded cold drawn tubes EN 10305-6 are a reliable and versatile choice for a wide range of mechanical applications. Their high-quality manufacturing process and strong mechanical properties make them a popular choice for industries such as automotive, construction, and manufacturing.

Non-destructive testing. Welded cold drawn steel tubes EN 10305-6

Non-destructive testing (NDT) is an important part of the quality control process for steel tubes. NDT is a method of testing materials without damaging or altering them. This allows manufacturers to test the quality of the tubes without having to discard them after testing.

The following are some of the NDT techniques used for welded cold drawn steel tubes according to EN 10305-6:

Eddy Current Testing (ET): Eddy current testing uses electromagnetic induction to detect surface and subsurface defects. This method is commonly used to detect cracks, voids, and other defects in steel tubes.
Magnetic Particle Testing (MT): Magnetic particle testing uses magnetic fields to detect surface and near-surface defects in ferromagnetic materials. This method is used to detect cracks, inclusions, and other surface defects.
Ultrasonic Testing (UT): Ultrasonic testing uses high-frequency sound waves to detect internal defects in materials. This method is commonly used to detect defects such as cracks, voids, and inclusions in steel tubes.
Visual Inspection (VI): Visual inspection is a basic method of non-destructive testing that involves visually examining the surface of the steel tube for defects such as cracks, pits, and surface irregularities.
Radiographic Testing (RT): Radiographic testing uses X-rays or gamma rays to detect internal defects in materials. This method is used to detect defects such as cracks, voids, and inclusions in steel tubes.

Each of these NDT techniques has its advantages and disadvantages, and the choice of which method to use depends on the specific requirements of the application and the characteristics of the steel tube being tested. NDT is an important part of the quality control process for welded cold drawn steel tubes and helps to ensure that the tubes meet the required specifications and standards for use in high-precision applications.

Surface condition. Welded cold drawn steel tubes EN 10305-6

EN 10305-6 is a European standard that specifies the technical delivery conditions for welded cold drawn steel tubes for precision applications. This standard defines the surface condition of steel tubes used in precision applications.

The surface condition of steel tubes is important because it affects the tube's performance and service life. The surface condition of the steel tube is determined by its surface roughness, surface defects, and surface cleanliness. The EN 10305-6 standard specifies four different surface conditions for steel tubes:

Internal and external surfaces without any special requirements: This surface condition is the least restrictive and is suitable for applications where the surface quality is not critical. The tubes should be free from visible defects that could affect their performance.
Internal and external surfaces with a roughness value: This surface condition requires that the surface of the tube has a defined roughness value, which is specified in the standard. The roughness value is a measure of the surface texture, and it is used to ensure that the tube's surface is smooth enough to prevent corrosion and wear.
Internal and external surfaces with a roughness value and improved cleanliness: This surface condition requires that the tube's surface has a defined roughness value, and it should be free from visible defects and contaminants that could affect the tube's performance.
Internal and external surfaces with a roughness value and enhanced cleanliness: This surface condition is the most restrictive and is suitable for applications where the surface quality is critical. The tube's surface must have a defined roughness value, and it should be free from visible defects, contaminants, and surface irregularities.

In addition to specifying the surface condition of steel tubes, the EN 10305-6 standard also defines other technical delivery conditions, such as the dimensional tolerances, the mechanical properties, and the chemical composition of the steel. These requirements ensure that the steel tubes are suitable for their intended application and that they meet the performance requirements of the end user.

Straightness. Welded cold drawn steel tubes EN 10305-6

EN 10305-6 is a European standard that specifies the technical delivery conditions for welded cold drawn steel tubes of circular cross-section for hydraulic and pneumatic power systems. The standard sets out the requirements for the straightness of these tubes, which is an important quality characteristic that affects their suitability for various applications.

The straightness of a steel tube refers to its deviation from a straight line when measured along its length. In the case of EN 10305-6 tubes, the straightness requirements are based on the maximum deviation from a straight line over a certain length of the tube, expressed in millimeters. The straightness tolerance is typically specified as a maximum deviation per unit length of the tube, such as per meter or per 1000 mm.

The straightness tolerance for EN 10305-6 tubes depends on the diameter of the tube and the length of the measurement interval. For example, for tubes with an outside diameter of up to 16 mm and a measurement interval of 1000 mm, the maximum deviation from a straight line is 1.5 mm. For larger diameters, the maximum deviation tolerance increases, with a tolerance of 2.5 mm for tubes with an outside diameter of 40 mm or more.

The standard also specifies the methods for measuring the straightness of the tubes, which involve placing the tube on a flat surface and measuring the distance between the tube and the surface at various points along its length. The measurements are typically taken using a straightedge or laser measurement device, and the results are recorded and compared to the specified tolerances.

In addition to the straightness requirements, EN 10305-6 also sets out other quality characteristics for welded cold drawn steel tubes, such as dimensional tolerances, mechanical properties, and surface quality. These requirements ensure that the tubes are suitable for use in hydraulic and pneumatic power systems, which require high-performance components that can withstand the stresses and pressures of these applications.

Dimensions and tolerances. Welded cold drawn Steel tubes EN 10305-6 EN 10305-6 is a European standard that specifies the technical delivery conditions for welded cold drawn steel tubes for precision applications. This standard applies to round, square, rectangular, and special shape welded tubes made from unalloyed or low alloy steels. The standard defines the dimensions and tolerances for these welded cold drawn steel tubes. These include: 1. Outer Diameter (OD): The outer diameter of the tube is measured from the outside edge to the opposite outside edge. The tolerances for OD are specified in the standard, and they depend on the size of the tube. For example, for tubes with an OD of up to 30mm, the tolerance is +/- 0.08mm. For tubes with an OD between 30mm and 50mm, the tolerance is +/- 0.1mm. 2. Inner Diameter (ID): The inner diameter of the tube is measured from the inside edge to the opposite inside edge. The tolerances for ID are also specified in the standard and depend on the size of the tube. For example, for tubes with an OD of up to 30mm, the tolerance is +/- 0.05mm. For tubes with an OD between 30mm and 50mm, the tolerance is +/- 0.07mm. 3. Wall Thickness: The wall thickness of the tube is measured as the distance between the inside and outside surfaces of the tube. The tolerances for wall thickness are specified in the standard and depend on the size of the tube. For example, for tubes with an OD of up to 30mm, the tolerance is +/- 10% of the wall thickness. For tubes with an OD between 30mm and 50mm, the tolerance is +/- 8% of the wall thickness. 4. Ovality: The ovality of the tube is the difference between the maximum and minimum diameters of the tube divided by the nominal diameter. The tolerances for ovality are specified in the standard and depend on the size of the tube. For example, for tubes with an OD of up to 30mm, the maximum ovality tolerance is 0.5% of the OD. For tubes with an OD between 30mm and 50mm, the maximum ovality tolerance is 0.6% of the OD. 5. Straightness: The straightness of the tube is measured as the maximum deviation from a straight line over a specified length. The tolerances for straightness are specified in the standard and depend on the size of the tube. For example, for tubes with an OD of up to 30mm, the maximum deviation tolerance is 0.3mm per meter. For tubes with an OD between 30mm and 50mm, the maximum deviation tolerance is 0.5mm per meter. 6. Length: The length of the tube is specified in the standard and can vary depending on the application. The standard specifies that the length tolerance for tubes up to 7 meters long is +/- 10mm. For tubes longer than 7 meters, the length tolerance is +/- 0.15% of the length. Overall, these dimensions and tolerances ensure that the welded cold drawn steel tubes meet the required specifications for precision applications.





















Sizes and tolerances Welded cold drawn Steel tubes EN 10305-6
Dimensions in millimetres
Specified outside diameter D with tolerance		Specified wall thickness T with tolerance		Specified inside diameter d with tolerance
4	±0,08	0.5	±0,05	3	±0,15
4	±0,08	1	±0,08	2	±0,15
5	±0,08	0.75	±0,06	3.5	±0,15
5	±0,08	1	±0,08	3	±0,15
6	±0,08	1	±0,08	4	±0,12
		1.5	±0,11	3	±0,15
		2	±0,15	2	±0,15
8	±0,08	1	±0,08	6	±0,10
		1.5	±0,11	5	±0,10
		2	±0,15	4	±0,15
		2.5	±0,19	3	±0,15
10	±0,08	1	±0,08	8	±0,08
		1.5	±0,11	7	±0,12
		2	±0,15	6	±0,15
		2.5	±0,19	5	±0,15
12	±0,08	1	±0,08	10	±0,08
		1.5	±0,11	9	±0,10
		2	±0,15	8	±0,12
		2.5	±0,19	7	±0,15
		3	±0,23	6	±0,15
14	±0,08	1	±0,08	12	±0,08
		1.5	±0,11	11	±0,08
		2	±0,15	10	±0,10
		2.5	±0,19	9	±0,12
		3	±0,23	8	±0,15
15	±0,08	1	±0,08	13	±0,08
		1.5	±0,11	12	±0,08
		2	±0,15	11	±010
		2.5	±0,19	10	±0,12
		3	±0,23	9	±0,15
16	±0,08	1	±0,08	14	±0,08
		1.5	±0,11	13
		2	±0,15	12
		2.5	±0,19	11	±0,15
		3	±0,23	10	±0,15
18	±0,08	1	±0,08	16	±0,08
		1.5	±0,11	15
		2	±0,15	14
		2.5	±0,19	13	±0,15
		3	±0,23	12	±0,15
20	±0,08	1.5	±0,11	17	±0,08
		2	±0,15	16	±0,08
		2.5	±0,19	15	±0,15
		3	±0,23	14
		3.5	±0,26	13
		4	±0,30	12
22	±0,08	1	±0,08	20	±0,08
		1.5	±0,11	19
		2	±0,15	18
		2.5	±0,19	17
		3	±0,23	16	±0,15
		3.5	±0,26	15
		4	±0,30	14
25	±0,08	1.5	±0,11	22	±0,08
		2	±0,15	21
		2.5	±0,19	20
		3	±0,23	19	±0,15
		4	±0,30	17
		4.5	±0,34	16
28	±0,08	1.5	±0,11	25	±0,08
		2	±0,15	24
		2.5	±0,19	23
		3	±0,23	22	±0,15
		4	±0,30	20	±0,15
30	±0,08	2	±0,15	26	±0,08
		2.5	±0,19	25	±0,08
		3	±0,23	24	±0,15
		4	±0,30	22	±0,15
35	±0,08	2	±0,15	31	±0,15
		2.5	±0,19	30
		3	±0,23	29
		4	±0,30	27
		5	±0,38	25
		6	±0,45	23
38	±0,08	2	±0,15	34	±0,15
		2.5	±0,19	33
		3	±0,23	32
		4	±0,30	30
		5	±0,38	28
		6	±0,45	26
		7	±0,53	24
		8	±0,60	22
42	±0,08	2	±0,15	38	±0,20
		3	±0,23	36
		4	±0,30	34
		5	±0,38	32
		8	±0,60	26
50	±0,20	4	±0,30	42	±0,20
		5	±0,38	40
		6	±0,45	38
		8	±0,60	34
55	±0,25	4	±0,30	47	±0,25
		6	±0,45	43
		8	±0,60	39
60	±0,25	5	±0,38	50	±0,25
60	±0,25	8	±0,60	44	±0,25
70	±0,30	5	±0,38	60	±0,30
70	±0,30	8	±0,60	54	±0,30
80	±0,35	6	±0,45	68	±0,35
		8	±0,60	64
		10	±0,75	60

Marking and Packing. Welded cold drawn steel tubes EN 10305-6

EN 10305-6 is a European standard that specifies the requirements for welded cold drawn precision steel tubes for use in mechanical and automotive engineering applications. The standard covers a range of sizes, shapes, and tolerances for the tubes.

When it comes to marking and packing of these tubes, the following details are usually included:

Marking: Each tube should be marked with the following information:

Manufacturer's name or trademark
Tube type (welded cold drawn precision steel tube)
Steel grade
Size (outer diameter and wall thickness)
Length
Heat number
Production standard (EN 10305-6)
Country of origin

Packing: The tubes should be packed in bundles or wooden boxes for shipment. The packing should be designed to protect the tubes from damage during transportation and storage. The following details should be included in the packing:

Quantity of tubes per bundle or box
Gross weight and net weight of each bundle or box
Identification markings (labels or tags) indicating the manufacturer, tube type, steel grade, size, and length of the tubes in the bundle or box
Packing list indicating the number of bundles or boxes, and the total quantity and weight of the tubes being shipped.

It is important to ensure that the marking and packing details comply with the requirements of EN 10305-6, as this helps to ensure the safe and efficient handling of the tubes during transportation, storage, and use.

Delivery of goods.

EN 10305-6 is a European standard that specifies the requirements for welded cold drawn tubes made of circular cross-sections for precision applications. These tubes are used primarily in hydraulic and pneumatic power systems, as well as in automotive and other mechanical engineering applications.

The delivery details for welded cold drawn tubes under this standard include the following aspects:

Dimensions and tolerances: The tubes must comply with the dimensional and tolerance requirements specified in the standard. The standard specifies the permissible deviations from the specified dimensions, which may vary depending on the type of tube and its intended use.
Steel grade and chemical composition: The standard defines the steel grades and chemical composition requirements for the tubes. The steel grades are identified by a code, which indicates the minimum yield strength and other properties of the steel.
Mechanical properties: The tubes must meet the specified mechanical properties, including tensile strength, yield strength, and elongation. The standard provides tables that specify the minimum values for these properties, depending on the type of tube and its dimensions.
Surface finish: The tubes must have a smooth surface finish, without any visible defects or damage. The standard specifies the permissible surface imperfections, which may include scratches, pits, and other types of defects.
Marking and packaging: The tubes must be marked with the steel grade, dimensions, and other relevant information, as well as the manufacturer's name and identification number. They must also be packaged in a suitable manner to protect them from damage during transport and storage.

Overall, the delivery details for welded cold drawn tubes under EN 10305-6 are designed to ensure that the tubes meet the specified requirements for precision applications and are of high quality and durability.

Supplier. Welded cold drawn steel tubes EN 10305-6

TAP Vietnam International Investment Joint Stock Company (TAP Vietnam) is a reputable supplier of welded cold drawn steel tubes EN 10305-6 in Vietnam. With its commitment to quality and customer satisfaction, the company has become a reliable partner for customers in various industries.

Welded cold drawn steel tubes EN 10305-6 are widely used in industries such as automotive, construction, and machinery manufacturing. These tubes are known for their high precision, excellent surface finish, and consistent dimensional accuracy. TAP Vietnam understands the importance of these features in manufacturing and ensures that its products meet the highest standards.

The company uses state-of-the-art machinery and equipment to produce high-quality welded cold drawn steel tubes EN 10305-6. TAP Vietnam's production facilities are equipped with the latest technology, ensuring that the tubes are manufactured to the highest standards. The company's team of skilled professionals is trained to use these machines and equipment to produce the best possible product.

TAP Vietnam is committed to providing its customers with the best possible service. The company's customer service team is available to answer any questions customers may have about its products or services. Whether customers need help choosing the right product or have questions about delivery, TAP Vietnam is always ready to assist.

TAP Vietnam's commitment to quality extends beyond its products and services. The company is also committed to environmental sustainability. TAP Vietnam recognizes the importance of reducing its environmental impact and has implemented measures to reduce waste and energy consumption.

In conclusion, TAP Vietnam International Investment Joint Stock Company is a reliable supplier of welded cold drawn steel tubes EN 10305-6 in Vietnam. With its commitment to quality, customer service, and environmental sustainability, the company is a trusted partner for customers in various industries. If you are looking for high-quality welded cold drawn steel tubes EN 10305-6, TAP Vietnam is the right choice.

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