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About us
Tianjin lefin Industrial
TIANJIN LEFIN STEEL GROUP containing Tianjin lefin Industrial Co.,Ltd. 、Tianjin lefin steel import & export Co.,Ltd and Tianjin Shengqifeng International Trading Co., Ltd. -
Products
Steel Pipe Processing
Our main products include 1/2inch to 16 inch ERW PIPE/GI PIPE which has been produced according to BS1387/ASTM A53/EN10219/EN10255/EN10217 Standard -
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Service Capability
Guarantee Quality
Our steel pipes are suitable for oil, natural gas, shipbuilding, chemical industry, water conservancy, electrical, steel structure, construction and other related fields.
- Details
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1. Standard Overview and Historical Evolution
- Core positioning: EN 10255 is a European technical standard for Non-alloy steel welded threaded tubes, with the full name "Non-alloy steel tubes suitable for welding and threading" (applicable to non-alloy steel tubes for welding and threading processing). Its latest version is EN 10255:2015, replacing the earlier version EN 10255:2004+A1:2007.
- Scope of application:
- Cover circular steel pipes with an outer diameter ranging from 10.2mm to 165.1mm (corresponding to thread dimensions of 1/8 to 1/6).
It is classified by thickness into Medium series and Heavy series, as well as three specified thickness types.
- Historical evolution: This standard evolved from the British standard BS 1387:1985 and has now become a common specification in Europe, especially applicable to low-pressure fluid systems such as gas and water transportation.2. Technical Requirements and Performance parameters
(1) Dimensions and Tolerances- Series Classification:
Series Type Wall thickness Range Typical Application Scenarios Medium-sized series Thinner General low-pressure fluid transportation Heavy-duty series Thicker High-pressure or mechanical structural components - Tolerance requirements: The standard strictly stipulates the allowable deviations of outer diameter, wall thickness and straightness. For example, the tolerance of outer diameter must be controlled within ±0.75%.
(2) Materials and Properties
- Steel grade classification:
- Non-alloy steel: Conforms to EN 10020 classification. Common grades include S195T (steel grade 1.0026), etc.
- Mechanical properties:
Performance indicators Required Values Test standards Yield strength ≥195 MPa (typical value of S195T) EN ISO 6892-1 Sealing performance Passed gas/liquid pressure test Water pressure or eddy current test Reaction to fire Flame retardant performance evaluation CPR certification requirements
- Chemical composition: Low-carbon design (C≤0.25%), ensuring welding and thread processing performance.3. Production process and quality control
(1) Manufacturing process
Typical production processes of seamless steel pipes include:
1.Raw material selection: High-quality non-alloy steel billets;
2. Heating and piercing: The billet is heated to a plastic state and then pierced to form the shape.
3. Hot rolling sizing: Control the outer diameter and wall thickness through hot rolling;
4. Heat treatment: Eliminate residual stress (such as annealing);
5. Surface treatment: pickling, phosphating or hot-dip galvanizing (a key step for anti-corrosion).(2) Key points of galvanizing process
- Prevention of immersion cracks: High-hardness steel pipes (HRC>50) need to undergo stress annealing at 450~650℃ before pickling to prevent hydrogen embrittlement cracks.
- Coating requirements: The galvanized layer needs to be evenly covered and comply with the durability standards (such as the regulations for gas pipes in T/CGAS 018-2021).(3) Certification and Testing
- CE certification mode:
- System 3: Tested and certified by a notified body (NB) of the European Union;
- System 4: Manufacturer self-inspection + Signing of DOP (Declaration of Conformity) + Internal Factory control.
Key test items: dimensional tolerance, yield strength, sealing performance, and hazardous substances (such as RoHS).
4. Application fields
- Core application scenarios:
- Oil and gas: Low-pressure transmission pipelines (requiring corrosion-resistant galvanized coating);
- Architecture and ships: Structural supports, fire protection pipes;
- Chemical equipment: Reactor pipelines, flexible food packaging machinery structures.5. Comparative analysis with relevant standards
Standard System Typical Representatives Differences from EN 10255 European Standard EN 10204 3.2 Require a material certificate issued by a third-party institution International Standard API 5L Focuses on high-pressure oil and gas transportation, with higher requirements for wall thickness Industry-specific standard T/CGAS 018-2021 Additional Special Inspection for Galvanized Coating of Gas Pipes Summary
EN 10255, as the core standard for non-alloy welded threaded pipes in Europe, its technical advantages lie in:
1. Lightweight design: Significantly reduces transportation and installation costs;
2. Process adaptability: The optimized chemical composition supports welding and galvanizing processing;
3. Environmental friendliness throughout the entire life cycle: In 68% of applications, carbon emissions are lower than those of alternative materials such as glass and aluminum.
EN 10255 STEEL PIPE
Subcategory
Keyword
- Details
-
1. Standard Overview and Historical Evolution
- Core positioning: EN 10255 is a European technical standard for Non-alloy steel welded threaded tubes, with the full name "Non-alloy steel tubes suitable for welding and threading" (applicable to non-alloy steel tubes for welding and threading processing). Its latest version is EN 10255:2015, replacing the earlier version EN 10255:2004+A1:2007.
- Scope of application:
- Cover circular steel pipes with an outer diameter ranging from 10.2mm to 165.1mm (corresponding to thread dimensions of 1/8 to 1/6).
It is classified by thickness into Medium series and Heavy series, as well as three specified thickness types.
- Historical evolution: This standard evolved from the British standard BS 1387:1985 and has now become a common specification in Europe, especially applicable to low-pressure fluid systems such as gas and water transportation.2. Technical Requirements and Performance parameters
(1) Dimensions and Tolerances- Series Classification:
Series Type Wall thickness Range Typical Application Scenarios Medium-sized series Thinner General low-pressure fluid transportation Heavy-duty series Thicker High-pressure or mechanical structural components - Tolerance requirements: The standard strictly stipulates the allowable deviations of outer diameter, wall thickness and straightness. For example, the tolerance of outer diameter must be controlled within ±0.75%.
(2) Materials and Properties
- Steel grade classification:
- Non-alloy steel: Conforms to EN 10020 classification. Common grades include S195T (steel grade 1.0026), etc.
- Mechanical properties:
Performance indicators Required Values Test standards Yield strength ≥195 MPa (typical value of S195T) EN ISO 6892-1 Sealing performance Passed gas/liquid pressure test Water pressure or eddy current test Reaction to fire Flame retardant performance evaluation CPR certification requirements
- Chemical composition: Low-carbon design (C≤0.25%), ensuring welding and thread processing performance.3. Production process and quality control
(1) Manufacturing process
Typical production processes of seamless steel pipes include:
1.Raw material selection: High-quality non-alloy steel billets;
2. Heating and piercing: The billet is heated to a plastic state and then pierced to form the shape.
3. Hot rolling sizing: Control the outer diameter and wall thickness through hot rolling;
4. Heat treatment: Eliminate residual stress (such as annealing);
5. Surface treatment: pickling, phosphating or hot-dip galvanizing (a key step for anti-corrosion).(2) Key points of galvanizing process
- Prevention of immersion cracks: High-hardness steel pipes (HRC>50) need to undergo stress annealing at 450~650℃ before pickling to prevent hydrogen embrittlement cracks.
- Coating requirements: The galvanized layer needs to be evenly covered and comply with the durability standards (such as the regulations for gas pipes in T/CGAS 018-2021).(3) Certification and Testing
- CE certification mode:
- System 3: Tested and certified by a notified body (NB) of the European Union;
- System 4: Manufacturer self-inspection + Signing of DOP (Declaration of Conformity) + Internal Factory control.
Key test items: dimensional tolerance, yield strength, sealing performance, and hazardous substances (such as RoHS).4. Application fields
- Core application scenarios:
- Oil and gas: Low-pressure transmission pipelines (requiring corrosion-resistant galvanized coating);
- Architecture and ships: Structural supports, fire protection pipes;
- Chemical equipment: Reactor pipelines, flexible food packaging machinery structures.5. Comparative analysis with relevant standards
Standard System Typical Representatives Differences from EN 10255 European Standard EN 10204 3.2 Require a material certificate issued by a third-party institution International Standard API 5L Focuses on high-pressure oil and gas transportation, with higher requirements for wall thickness Industry-specific standard T/CGAS 018-2021 Additional Special Inspection for Galvanized Coating of Gas Pipes Summary
EN 10255, as the core standard for non-alloy welded threaded pipes in Europe, its technical advantages lie in:
1. Lightweight design: Significantly reduces transportation and installation costs;
2. Process adaptability: The optimized chemical composition supports welding and galvanizing processing;
3. Environmental friendliness throughout the entire life cycle: In 68% of applications, carbon emissions are lower than those of alternative materials such as glass and aluminum.
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Address: Hengtai Road,Daqiuzhuang Town,Jinghai County,Tianjin,China
Mob: +8615122229899(whatspp)
Phone: +86 22 58171905
Fax: +86 22 58171902
E-mail:info@lefinsteel.com
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