EN 10216-4 P255QL Seamless Carbon Steel Tube

EN 10216-4 P255QL Seamless Carbon Steel Tube

EN 10216-4 P255QL Seamless Carbon Steel Tube, What is EN 10216-4 P255QL? Understanding the Definition, Properties, and Applications of Seamless Steel Pipes


In the realm of carbon steel pipes, adhering to quality standards is of utmost importance to ensure reliability and performance. One such significant standard is EN 10216-4, which outlines the technical delivery conditions for seamless carbon steel pipes made of fine-grain steels. This article aims to provide a comprehensive understanding of the EN 10216-4 P255QL standard. We will delve into general information about P255QL, its applications, variations, technical details, dimensions and tolerances, chemical properties, mechanical properties, and the certification process.

General Information about EN 10216-4 P255QL Seamless Carbon Steel Tube:

P255QL is a specific grade of seamless carbon steel pipes that conform to the EN 10216-4 standard. It falls under the category of fine-grain steels, which offer excellent weldability and exceptional toughness even at low temperatures. P255QL pipes are primarily employed in low-temperature applications, particularly in the construction of pressure vessels and pipelines. These pipes are renowned for their reliability, durability, and resistance to brittle fracture, making them well-suited for demanding environments where low temperatures are a concern.

Varieties of EN 10216-4 P255QL Tubes:

The EN 10216-4 standard encompasses various steel grades and pipe sizes to cater to different industry requirements. Manufacturers produce different variations of P255QL pipes to meet specific project needs. These variations may include different wall thicknesses, diameters, and lengths.

Technical Details, Dimensions, and Tolerances:

EN 10216-4 provides comprehensive technical information about P255QL seamless carbon steel pipes, including manufacturing methods, chemical composition, and mechanical properties. The standard also specifies dimensions and tolerances for outer diameter, wall thickness, and length. Adhering to these parameters ensures consistency, compatibility, and easy integration of P255QL pipes into various systems.

Chemical Properties:

P255QL seamless carbon steel pipes possess specific chemical properties that define their composition. The chemical composition typically includes elements such as carbon, manganese, phosphorus, sulfur, silisyum, and others. These elements contribute to the overall characteristics and performance of the pipes, ensuring their suitability for low-temperature applications.

Here is the table the typical maximum and minimum chemical values of EN 10216-4 P255QL quality:

Chemical ComponentMinimum ValueMaximum Value
Carbon (C)0.12%0.18%
Silisyum (Si)0.15%0.35%
Manganese (Mn)0.40%0.90%
Phosphorus (P)0.025%
Sulfur (S)0.010%

Please note that this table provides the typical maximum and minimum chemical values for EN 10216-4 P255QL quality. It is important to refer to the specific standards and specifications for accurate and up-to-date information regarding your specific projects or applications.

Mechanical Properties:

The mechanical properties of P255QL pipes play a crucial role in determining their strength, toughness, and performance at low temperatures. The standard specifies parameters such as yield strength, tensile strength, impact resistance, and elongation. These properties ensure the reliability and integrity of P255QL pipes, especially in environments where low temperatures and pressure are present.

Here is the table the typical maximum and minimum mechanical values of EN 10216-4 P255QL quality:

Mechanical PropertyMinimum ValueMaximum Value
Yield Strength255 MPa
Tensile Strength450-610 MPa

Please note that this table provides the typical maximum and minimum mechanical values for EN 10216-4 P255QL quality. It is important to refer to the specific standards and specifications for accurate and up-to-date information regarding your specific projects or applications.

Certification Process:

To ensure compliance with the EN 10216-4 P255QL standard and specific requirements for seamless carbon steel pipes, manufacturers can obtain certifications. Certifications, such as EN 10204, provide assurance to customers and regulatory bodies regarding the quality and traceability of the pipes. Adhering to certification requirements enhances trust and confidence in the industry.


EN 10216-4 P255QL seamless carbon steel pipes offer a reliable and high-quality solution for low-temperature applications, particularly in pressure vessel and pipeline constructions. These pipes exhibit excellent weldability, toughness, and resistance to brittle fracture at low temperatures. By understanding the general information, applications, variations, technical details, dimensions and tolerances, chemical properties, mechanical properties, and the certification process associated with P255QL pipes, industry professionals can make informed decisions regarding their usage. Choosing P255QL pipes ensures the longevity, safety, and performance of industrial systems operating in challenging low-temperature environments.

  • DIN: Deutsche Industrie Norm (German Industrial Standard)
  • EN: European Norm (European Standard)
  • 10216-4: Standard number within the EN 10216 series for seamless steel tubes for specific purposes other than pressure purposes
  • P255QL: Material grade designation for a quenched and tempered steel tube with a minimum yield strength of 255 MPa and low temperature properties (the “P” indicates specific purposes, “255” denotes the minimum yield strength, and “QL” indicates quenched and tempered condition)


EN 10216-4 P255QL Seamless Carbon Steel Tube


(EN)10216-4 P255QL Quality: Applications and Usage Areas of Seamless Steel Tubes 

P255QL grade steel tubes find extensive applications in various industries due to their unique characteristics. Here are some key areas where P255QL is utilized:

  • Oil and Gas Industry: P255QL tubes are commonly used in the oil and gas industry, particularly in offshore environments. These tubes are employed in subsea pipelines, platforms, and equipment that operate at low temperatures, ensuring reliable performance and durability.
  • Petrochemical Industry: P255QL is utilized in the petrochemical industry for applications such as oil refineries, chemical processing plants, and gas processing facilities. The steel tubes are suitable for transporting and processing corrosive fluids and gases at low temperatures.
  • LNG Terminals: P255QL tubes play a crucial role in LNG terminals, where they are used for the import, export, storage, and regasification of liquefied natural gas. These tubes ensure the safe and efficient transfer of LNG at low temperatures.
  • Cryogenic Equipment: P255QL grade steel tubes are employed in cryogenic equipment, including storage tanks, cryogenic containers, and transport vessels. These tubes provide excellent low-temperature properties, ensuring the safe and reliable storage and transportation of cryogenic substances.
  • Chemical Storage: P255QL is utilized in the construction of chemical storage tanks and containers that handle hazardous chemicals at low temperatures. The steel tubes offer superior corrosion resistance and low-temperature toughness, ensuring the integrity of chemical storage systems.

Advantages of P255QL Grade:

P255QL offers several advantages, making it a preferred choice in specific low-temperature applications:

  • Low-Temperature Performance: The steel tubes exhibit excellent performance and reliability in low-temperature environments, ensuring structural integrity and operational safety.
  • Weldability: P255QL grade demonstrates excellent weldability, allowing for efficient fabrication and construction of pressure vessels, pipelines, and storage tanks.
  • Impact Resistance: The steel tubes possess high impact resistance, which is crucial in applications where sudden temperature changes or impact loads may occur.


EN 10216-4 P255QL Seamless Carbon Steel Tube Quality: Applications and Usage Areas of Seamless Steel Tubes


What is EN standards classification?: A Comprehensive Overview

Understanding EN Standards Classification:

EN Standards Classification is a systematic framework established by the European Committee for Standardization (CEN) to categorize seamless steel pipes based on specific characteristics and requirements. It provides a clear structure that enables manufacturers, suppliers, and users to identify and select the most suitable seamless steel pipes for their intended applications.

Key Components of EN Classification:

The EN Standards Classification comprises several key components that help in categorizing seamless steel pipes. Some important components include:

  • Material Composition: EN Standards Classification takes into account the material composition of seamless steel pipes, such as the type of steel used and its chemical composition. This classification helps identify pipes suitable for specific environments, such as high temperatures, corrosive conditions, or extreme pressure applications.
  • Mechanical Properties: Seamless steel pipes are classified based on their mechanical properties, including tensile strength, yield strength, elongation, and impact resistance. This classification enables users to select pipes with the required mechanical properties for their intended applications, ensuring structural integrity and performance.
  • Dimensional Specifications: EN Standards Classification considers dimensional specifications such as outer diameter, wall thickness, and length. These specifications help users identify pipes that meet their precise dimensional requirements, ensuring compatibility with existing infrastructure and ease of installation.
  • Application-specific Standards: The EN Standards Classification also includes specific standards tailored for various applications, such as pipes for structural purposes, pressure applications, or high-temperature environments. These application-specific standards provide detailed requirements and guidelines to ensure seamless steel pipes perform optimally in their intended applications.

Significance of EN Classification:

The EN Standards Classification offers several advantages for stakeholders in the seamless steel pipe sector:

  • Standardization: By categorizing seamless steel pipes based on specific criteria, the EN Standards Classification promotes standardization across the industry. It ensures consistency in product quality, performance, and dimensional specifications, allowing for seamless integration of pipes from different manufacturers.
  •  Product Selection: The classification system helps users identify seamless steel pipes that align with their specific requirements, eliminating the guesswork involved in selecting the right product. It allows for informed decision-making, ensuring that the chosen pipes meet the necessary standards for their intended applications.c.

Compliance and Regulation:

The EN Standards Classification ensures compliance with industry regulations and safety standards. It provides a reliable framework for manufacturers and suppliers to produce and supply seamless steel pipes that meet the necessary requirements, ensuring the overall safety and reliability of infrastructure and systems.

Application Areas:

The EN Standards Classification is applicable to various industries where seamless steel pipes are used, including:

  • Oil and Gas: The classification system helps identify seamless steel pipes suitable for oil and gas exploration, production, and transportation, ensuring the integrity and reliability of pipelines and offshore structures.
  • Construction and Infrastructure: EN Standards Classification assists in selecting seamless steel pipes for construction and infrastructure projects, such as building frameworks, bridges, and underground pipelines, ensuring strength, durability, and compliance with building codes.
  • Mechanical Engineering: The classification system aids in choosing seamless steel pipes for mechanical engineering applications, including machinery, equipment, and automotive components. It ensures the pipes meet the required specifications for mechanical strength, precision, and performance.

The EN Standards Classification is a valuable tool for the seamless steel pipe industry, providing a structured approach to categorizing pipes based on material composition, mechanical properties, dimensional specifications, and application-specific requirements.


What is EN standards classification?

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