Welded cold sized Steel tubes EN 10305-3

Introduce. Welded cold sized Steel tubes EN 10305-3

BS EN 10305-3 is a European standard that specifies the technical delivery conditions for welded cold-sized steel tubes for precision applications. These tubes are primarily used in hydraulic and pneumatic power systems, as well as in automotive and mechanical engineering applications.

The standard defines the requirements for welded cold-sized precision steel tubes that are made from unalloyed or low-alloyed steels in accordance with specified chemical composition and mechanical properties. The tubes can be circular, square, rectangular, or elliptical in shape, with the size range specified in the standard.

The standard specifies the following technical delivery conditions for the welded cold-sized precision steel tubes:

Dimensions and tolerances: The standard defines the outer diameter, wall thickness, and length of the tubes, as well as the permissible deviations from the specified dimensions.
Steel grades and chemical composition: The standard specifies the chemical composition of the steel used to manufacture the tubes, including the maximum limits for certain elements such as carbon, manganese, sulfur, and phosphorus.
Mechanical properties: The standard defines the mechanical properties of the tubes, including the minimum values for yield strength, tensile strength, and elongation.
Surface condition: The standard specifies the surface condition of the tubes, including the permissible surface defects, such as scratches and pits.
Inspection and testing: The standard outlines the inspection and testing requirements for the tubes, including the methods for testing the chemical composition, mechanical properties, and surface condition of the tubes.
Certification and marking: The standard requires the manufacturer to provide a certification that the tubes meet the requirements of the standard, as well as to mark the tubes with the required information, such as the steel grade, dimensions, and identification number.

In summary, BS EN 10305-3 defines the technical delivery conditions for welded cold-sized precision steel tubes used in hydraulic and pneumatic power systems, as well as in automotive and mechanical engineering applications. The standard specifies the requirements for the dimensions, chemical composition, mechanical properties, surface condition, inspection and testing, and certification and marking of these tubes.

Material. Welded cold sized Steel tubes EN 10305-3

EN 10305-3 is a European standard for precision steel tubes that are used in various applications such as hydraulic and pneumatic systems. The standard specifies the technical delivery conditions for seamless cold-drawn precision steel tubes of circular cross-section for precision applications.

The steel tubes specified in EN 10305-3 are produced in various grades and steel numbers, which are classified based on their chemical composition, mechanical properties, and other characteristics. Here are some of the most commonly used steel names and steel numbers for steel tubes according to EN 10305-3:

Steel name: E235 Steel number: 1.0308 Description: This is a non-alloy steel grade with a minimum yield strength of 235 MPa. It is widely used in the automotive industry for the production of fuel injection lines and brake systems.
Steel name: E355 Steel number: 1.0580 Description: This is a non-alloy steel grade with a minimum yield strength of 355 MPa. It is commonly used in the manufacturing of hydraulic and pneumatic cylinders, as well as in the production of machine parts and mechanical engineering components.
Steel name: E470 Steel number: 1.0536 Description: This is a low-alloy steel grade with a minimum yield strength of 470 MPa. It is used in the production of hydraulic cylinders for heavy-duty applications such as construction machinery, cranes, and mining equipment.
Steel name: E190 Steel number: 1.0033 Description: This is a non-alloy steel grade with a minimum yield strength of 190 MPa. It is used in the production of precision steel tubes for general engineering purposes.
Steel name: E275 Steel number: 1.0225 Description: This is a non-alloy steel grade with a minimum yield strength of 275 MPa. It is used in the manufacturing of precision steel tubes for automotive applications, such as shock absorber tubes and steering columns.
Steel name: E410 Steel number: 1.0509 Description: This is a low-alloy steel grade with a minimum yield strength of 410 MPa. It is used in the production of hydraulic and pneumatic cylinders for medium-duty applications such as agricultural and forestry machinery.

These are some of the most commonly used steel names and steel numbers for steel tubes according to EN 10305-3. Each steel grade has its own unique properties that make it suitable for specific applications. It is important to choose the right steel grade based on the application requirements to ensure optimal performance and reliability.

Mechanical properties.

EN 10305-3 is a European standard that specifies the technical delivery conditions for welded and cold-drawn steel tubes for precision applications. The mechanical properties of steel tubes according to EN 10305-3 are as follows:

Tensile strength: The tensile strength of the steel tube is the maximum amount of stress that it can withstand before it breaks. The minimum tensile strength required for EN 10305-3 steel tubes is 420 N/mm².
Yield strength: The yield strength of the steel tube is the amount of stress that it can withstand before it begins to deform permanently. The minimum yield strength required for EN 10305-3 steel tubes is 350 N/mm².
Elongation: Elongation is the amount of deformation that a material can undergo before it breaks. The minimum elongation required for EN 10305-3 steel tubes is 15%.
Impact strength: Impact strength is a measure of the amount of energy that a material can absorb before it fractures. The minimum impact strength required for EN 10305-3 steel tubes is 27 J at -20°C.
Hardness: Hardness is a measure of a material's resistance to indentation or scratching. The minimum hardness required for EN 10305-3 steel tubes is 170 HV.
Flattening test: The flattening test is a measure of the ductility of the steel tube. The tube is flattened until its outside diameter is reduced by a specific percentage. The minimum flattening ratio required for EN 10305-3 steel tubes is 20%.
Bend test: The bend test is a measure of the ductility of the steel tube. The tube is bent to a specific radius without cracking or breaking. The minimum bend radius required for EN 10305-3 steel tubes is 2 times the outside diameter of the tube.

Overall, EN 10305-3 steel tubes are known for their high strength, excellent ductility, and good impact resistance. These properties make them suitable for use in a variety of precision applications, such as automotive parts, hydraulic cylinders, and machine components.

Mechanical properties. Welded cold sized Steel tubes EN 10305-3

Tensile strength: The tensile strength of the steel tube is the maximum amount of stress that it can withstand before it breaks. The minimum tensile strength required for EN 10305-3 steel tubes is 420 N/mm².
Yield strength: The yield strength of the steel tube is the amount of stress that it can withstand before it begins to deform permanently. The minimum yield strength required for EN 10305-3 steel tubes is 350 N/mm².
Elongation: Elongation is the amount of deformation that a material can undergo before it breaks. The minimum elongation required for EN 10305-3 steel tubes is 15%.
Impact strength: Impact strength is a measure of the amount of energy that a material can absorb before it fractures. The minimum impact strength required for EN 10305-3 steel tubes is 27 J at -20°C.
Hardness: Hardness is a measure of a material's resistance to indentation or scratching. The minimum hardness required for EN 10305-3 steel tubes is 170 HV.
Flattening test: The flattening test is a measure of the ductility of the steel tube. The tube is flattened until its outside diameter is reduced by a specific percentage. The minimum flattening ratio required for EN 10305-3 steel tubes is 20%.
Bend test: The bend test is a measure of the ductility of the steel tube. The tube is bent to a specific radius without cracking or breaking. The minimum bend radius required for EN 10305-3 steel tubes is 2 times the outside diameter of the tube.

Surface condition.

EN 10305-3 is a European standard that specifies the technical delivery conditions for welded cold sized steel tubes of circular cross section for precision applications. The standard defines different surface conditions for steel tubes, which are described below:

Natural surface: This refers to the surface condition of a steel tube that has not undergone any additional treatment after manufacturing. It may have some irregularities, such as small scratches or slight discoloration due to the manufacturing process.
Phosphated surface: Phosphating is a chemical process that involves the application of a phosphate coating on the surface of a steel tube. This treatment helps to improve the corrosion resistance and enhances the adhesion of coatings or lubricants applied to the surface. The surface has a dull, grey appearance.
Zinc-plated surface: Zinc plating is a process in which a layer of zinc is applied to the surface of the steel tube. This treatment provides excellent corrosion resistance, as the zinc layer acts as a sacrificial anode, corroding before the steel does. The surface has a bright, shiny appearance.
Chrome VI-free surface: This surface condition is obtained by applying a thin layer of passivation treatment on the steel tube. The treatment is free of hexavalent chromium (CrVI), which is a toxic chemical that can cause health and environmental problems. The surface has a slightly yellowish appearance.
Oiled surface: An oiled surface is obtained by applying a thin layer of oil on the surface of the steel tube. This treatment provides temporary protection against corrosion and facilitates handling and storage of the tubes. The surface has a slightly shiny appearance.
Phosphated and oiled surface: This surface condition combines the benefits of phosphating and oiling treatments. The steel tube is first phosphated to enhance its corrosion resistance and adhesion of coatings or lubricants, and then oiled to provide temporary protection and facilitate handling and storage. The surface has a dull, grey appearance with a slight shine due to the oil.

Overall, the choice of surface condition depends on the specific application and the required properties of the steel tube, such as corrosion resistance, adhesion, and appearance.

Sizes and diameter tolerances Welded cold sized Steel tubes EN 10305-3 EN 10305-3 is a European standard that specifies the technical delivery conditions for welded cold-sized steel tubes for precision applications. These tubes are typically used in the mechanical engineering and automotive industries, where high precision and reliability are required. The standard defines several requirements for the sizes and diameter tolerances of the tubes. These include: 1. Nominal sizes: The nominal sizes of the tubes range from 6mm to 200mm, with wall thicknesses from 0.5mm to 10mm. 2. Dimensions: The standard specifies the dimensions of the tubes, including the outside diameter, wall thickness, and length. The outside diameter of the tubes ranges from 6mm to 200mm, with a tolerance of +/- 0.08mm. The wall thickness ranges from 0.5mm to 10mm, with a tolerance of +/- 10%. 3. Ovality: The standard specifies the ovality of the tubes, which is the difference between the maximum and minimum diameter of the tube divided by the nominal diameter. The ovality tolerance ranges from 0.4% to 1.0%, depending on the diameter and wall thickness of the tube. 4. Straightness: The standard specifies the straightness of the tubes, which is the maximum deviation from a straight line over the length of the tube. The straightness tolerance ranges from 0.15% to 0.25% depending on the diameter and wall thickness of the tube. 5. Length: The standard specifies the length of the tubes, which can be cut to specific lengths or supplied in random lengths. The tolerance on length is +/- 500mm or +/- 3% of the total length, whichever is greater. 6. Surface finish: The standard specifies the surface finish of the tubes, which must be free from defects and have a smooth, clean surface. In summary, the EN 10305-3 standard defines the sizes and diameter tolerances for welded cold-sized steel tubes for precision applications, including nominal sizes, dimensions, ovality, straightness, length, and surface finish. These specifications ensure that the tubes meet the high precision and reliability requirements of the mechanical engineering and automotive industries.
















Sizes and diameter tolerances Welded cold sized Steel tubes EN 10305-3
Dimensions in millimetres
Outside diameter D and tolerances		Wall thickness T (mm)
		0.6	0.8	1	1.2	1.5	1.8	2	2.2	2.5	3	3.5	4	4.5	5	5.5	6
		Mass per unit length (kg/m)
6	±0,12	0.080	0.103	0.123
8		0.109	0.142	0.173	0.201	0.240
10		0.139	0.182	0.222	0.260	0.314
12		0.169	0.221	0.271	0.320	0.388	0.453	0.493
15		0.213	0.280	0.345	0.408	0.499	0.586	0.641	0.694
16		0.228	0.300	0.370	0.438	0.536	0.630	0.691	0.749
18		0.257	0.339	0.419	0.497	0.610	0.719	0.789	0.857	0.956
19		0.272	0.359	0.444	0.527	0.647	0.764	0.838	0.911	1.02	1.18
20	±0,15	0.287	0.379	0.469	0.556	0.684	0.808	0.888	0.966	1.08	1.26
22		0.317	0.418	0.518	0.616	0.758	0.897	0.986	1.07	1.20	1.41
25		0.361	0.477	0.592	0.704	0.869	1.03	1.13	1.24	1.39	1.63
28		0.405	0.537	0.666	0.793	0.980	1.16	1.28	1.40	1.57	1.85	2.11
30		0.435	0.576	0.715	0.852	1.05	1.25	1.38	1.51	1.70	2.00	2.29
32	±0,20		0.616	0.765	0.911	1.13	1.34	1.48	1.62	1.82	2.15	2.46
35				0.838	1.00	1.24	1.47	1.63	1.78	2.00	2.37	2.72
38				0.912	1.09	1.35	1.61	1.78	1.94	2.19	2.59	2.98	3.35
40				0.962	1.15	1.42	1.70	1.87	2.05	2.31	2.74	3.15	3.55
42				1.01	1.21	1.50	1.78	1.97	2.16	2.44	2.89	3.32	3.75
42.4				1.02	1.22	1.51	1.80	1.99	2.18	2.46	2.91	3.36	3.79
44	±0,25			1.06	1.27	1.57	1.87	2.07	2.27	2.56	3.03	3.50	3.95
45				1.09	1.30	1.61	1.92	2.12	2.32	2.62	3.11	3.58	4.04
48.3				1.17	1.39	1.73	2.06	2.28	2.50	2.82	3.35	3.87	4.37	4.86
50				1.21	1.44	1.79	2.14	2.37	2.59	2.93	3.48	4.01	4.54	5.05
51					1.47	1.83	2.18	2.42	2.65	2.99	3.55	4.10	4.64	5.16
55	±0,30				1.59	1.98	2.36	2.61	2.86	3.24	3.85	4.45	5.03	5.60
57					1.65	2.05	2.45	2.71	2.97	3.36	4.00	4.62	5.23	5.83
60					1.74	2.16	2.58	2.86	3.14	3.55	4.22	4.88	5.52	6.16	6.78	7.39
63.5					1.84	2.29	2.74	3.03	3.33	3.76	4.48	5.18	5.87	6.55	7.21	7.87
70	±0,35				2.04	2.53	3.03	3.35	3.68	4.16	4.96	5.74	6.51	7.27	8.01	8.75
76	±0,35				2.21	2.76	3.29	3.65	4.00	4.53	5.40	6.26	7.10	7.93	8.75	9.56
80	±0,40				2.33	2.90	3.47	3.85	4.22	4.78	5.70	6.60	7.50	8.38	9.25	10.1
89						3.24	3.87	4.29	4.71	5.33	6.36	7.38	8.38	9.38	10.4	11.3	12.3
90						3.27	3.92	4.34	4.76	5.39	6.44	7.47	8.48	9.49	10.5	11.5	12.4
100	±0,50					3.64	4.36	4.83	5.31	6.01	7.18	8.33	9.47	10.6	11.7	12.8	13.9
101.6	±0,50					3.70	4.43	4.91	5.39	6.11	7.29	8.47	9.63	10.8	11.9	13.0	14.1
108	±0,60					3.94	4.71	5.23	5.74	6.50	7.77	9.02	10.3	11.5	12.7	13.9	15.1
114							4.98	5.52	6.07	6.87	8.21	9.54	10.9	12.2	13.4	14.7	16.0
120							5.25	5.82	6.39	7.24	8.66	10.1	11.4	12.8	14.2	15.5	16.9
127	±0,8						5.56	6.17	6.77	7.68	9.17	10.7	12.1	13.6	15.0	16.5	17.9
133							5.82	6.46	7.10	8.05	9.62	11.2	12.7	14.3	15.8	17.3	18.8
139.7							6.12	6.79	7.46	8.46	10.1	11.8	13.4	15.0	16.6	18.2	19.8
159	±1,0						6.98	7.74	8.51	9.65	11.5	13.4	15.3	17.1	19.0	20.8	22.6
168							7.38	8.19	9.00	10.2	12.2	14.2	16.2	18.1	20.1	22.0	24.0
193.7									10.4	11.8	14.1	16.4	18.7	21.0	23.3	25.5	27.8

Inspection and testing.

EN 10305-3 is a European standard that specifies the technical delivery conditions for welded and cold-drawn seamless steel tubes for precision applications. The standard applies to steel tubes with circular cross-sections and wall thicknesses of between 0.5mm and 5mm.

The inspection and testing requirements of EN 10305-3 are as follows:

Visual Inspection: This is a non-destructive inspection method that involves examining the surface of the steel tube for defects such as cracks, pits, and other surface irregularities.
Dimensional Inspection: This involves measuring the dimensions of the steel tube, including its outer diameter, wall thickness, and length, to ensure that it conforms to the specified requirements.
Chemical Analysis: A chemical analysis is carried out to determine the chemical composition of the steel tube. The analysis involves taking a small sample of the steel tube and subjecting it to various tests to determine the levels of different elements such as carbon, manganese, and sulfur.
Mechanical Testing: Mechanical testing is used to determine the mechanical properties of the steel tube. The tests involve subjecting the tube to different types of stress, such as tension, compression, or bending, and measuring its response.
Non-Destructive Testing: Non-destructive testing (NDT) methods are used to detect defects in the steel tube that may not be visible to the naked eye. Examples of NDT methods include ultrasonic testing, magnetic particle testing, and eddy current testing.
Hydrostatic Testing: Hydrostatic testing involves subjecting the steel tube to a pressure test to determine its strength and leak tightness. The tube is filled with water and pressurized to a specified level, and any leaks or weaknesses are detected.
Surface Roughness Testing: Surface roughness testing is used to determine the roughness of the inner and outer surfaces of the steel tube. The test involves using a specialized instrument to measure the surface roughness in terms of Ra, Rz, or other parameters.

All of these inspection and testing methods are designed to ensure that the steel tubes conform to the specified requirements for quality and safety.

Certification and marking.

EN 10305-3 is a European standard for steel tubes that specifies the technical delivery conditions for precision tubes. This standard applies to steel tubes with a circular cross-section, made from either welded or seamless material, and with a wall thickness ranging from 0.5mm to 5mm.

The certification and marking of steel tubes according to EN 10305-3 may include the following:

EN 10204-3.1 certification: This certification provides a declaration of compliance with the material requirements specified in the standard. It includes details such as the chemical composition, mechanical properties, and test results of the steel tube.
CE marking: This is a mandatory marking for products sold within the European Union (EU). It indicates that the product meets the essential requirements of EU directives and regulations related to health, safety, and environmental protection.
Manufacturer's identification: This marking identifies the manufacturer of the steel tube and may include details such as the name, trademark, or logo of the company.
Size and dimension marking: This marking indicates the outer diameter, wall thickness, and length of the steel tube.
Heat number: This marking identifies the heat treatment batch used for manufacturing the steel tube.
Traceability marking: This marking provides information on the material source, processing history, and inspection status of the steel tube. It helps to ensure quality control and enables traceability throughout the supply chain.
Pressure and temperature rating: This marking indicates the maximum pressure and temperature that the steel tube can withstand.

Overall, the certification and marking of steel tubes according to EN 10305-3 are designed to ensure that the tubes meet the specified technical requirements and provide reliable performance for their intended application.

Supplier. Welded cold sized Steel tubes EN 10305-3

TAP Viet nam International Investment Joint Stock Company (TAP Viet nam) is a leading supplier of welded cold-sized steel tubes EN 10305-3, serving a wide range of industries including automotive, construction, and furniture.

With a commitment to quality, reliability, and customer satisfaction, TAP Viet nam has become a trusted partner for companies around the world looking for high-quality steel tubes. The company uses advanced manufacturing processes and cutting-edge technology to produce tubes that meet the strictest international standards.

TAP Viet nam's welded cold-sized steel tubes EN 10305-3 are made from high-quality steel, ensuring strength and durability. The tubes are available in a variety of sizes and shapes, making them suitable for a wide range of applications.

One of the key advantages of TAP Viet nam's steel tubes is their precision. The company uses advanced welding techniques to produce tubes with tight tolerances, ensuring that each tube is the exact size and shape required for the intended application.

In addition to their precision, TAP Viet nam's steel tubes are also highly customizable. The company offers a range of surface finishes and coatings, as well as custom shapes and sizes, allowing customers to tailor the tubes to their specific needs.

TAP Viet nam's commitment to quality extends beyond its products. The company also has a strong focus on customer service, working closely with clients to ensure that they receive the right product for their needs, on time and at a competitive price.

Overall, TAP Viet nam International Investment Joint Stock Company is a reliable and trusted supplier of welded cold-sized steel tubes EN 10305-3. With a commitment to quality, precision, and customer satisfaction, the company is well positioned to serve the needs of customers around the world.

Welded Steel tube E700, EN 10305-3	Welded Steel tube E600, EN 10305-3	Welded Steel tube E550, EN 10305-3
Welded Steel tube E500, EN 10305-3	Welded Steel tube E460, EN 10305-3	Welded Steel tube E420, EN 10305-3
Welded Steel tube E355, EN 10305-3	Welded Steel tube E320, EN 10305-3	Welded Steel tube E275, EN 10305-3
Welded Steel tube E260, EN 10305-3	Welded Steel tube E235, EN 10305-3	Welded Steel tube E220, EN 10305-3
Welded Steel tube E195, EN 10305-3	Welded Steel tube E190, EN 10305-3	Welded Steel tube E155, EN 10305-3

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