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Grades, Chemical Composition & Applications

Introduction

EN 10216-2 specifies the technical delivery conditions for seamless circular steel tubes with specified elevated-temperature properties. The standard covers non-alloy and alloy steel tubes intended for pressure applications where resistance to elevated temperatures and reliable mechanical properties are required.

EN 10216-2 seamless tubes are widely used for boilers, pressure equipment, heat exchangers, power-generation systems, petrochemical plants and high-temperature piping. Ladhani Metal Corporation supplies EN 10216-2 seamless steel tubes in required grades, dimensions, wall thicknesses and delivery conditions.

Applicable Standard

EN 10216-2 – Seamless Steel Tubes for Pressure Purposes – Part 2: Non-Alloy and Alloy Steel Tubes with Specified Elevated Temperature Properties.

The specification establishes requirements for chemical composition, mechanical properties at room and elevated temperatures, heat treatment, dimensions, testing and inspection.

Material Type

EN 10216-2 covers seamless pressure tubes manufactured from:

• Non-Alloy Steel
• Alloy Steel
• Creep-Resistant Steel
• Elevated-Temperature Pressure Steel

The alloying elements commonly used in these steels include chromium, molybdenum and other controlled additions to improve high-temperature strength, oxidation resistance and creep resistance.

Forms of Supply

• Seamless Steel Tubes
• Seamless Boiler Tubes
• Pressure Tubes
• Alloy Steel Tubes
• Non-Alloy Steel Tubes
• Heat Exchanger Tubes
• High-Temperature Tubes
• Steam Tubes
• Superheater Tubes
• Economizer Tubes
• Hot Finished Tubes
• Cold Finished Tubes
• Cut-to-Length Tubes

Grades Covered

Non-Alloy Steel Grades

P195GH | P235GH | P265GH

Alloy Steel Grades

16Mo3 | 13CrMo4-5 | 10CrMo5-5 | 12CrMo9-10 | 14MoV6-3 | 10CrMo9-10 | 7CrWVMoNb9-6

Additional High-Temperature Grades

X10CrWMoVNb9-2 | X11CrMo5 | X11CrMo9-1 | X10CrMoVNb9-1

The exact grade range depends on the applicable edition of EN 10216-2 and the product category being ordered.

Grade Designation

• P = Steel intended for pressure purposes
• GH = Steel with specified elevated-temperature properties
• Mo = Molybdenum-alloyed steel
• CrMo = Chromium-molybdenum alloy steel
• CrMoV = Chromium-molybdenum-vanadium alloy steel
• CrMoW = Chromium-molybdenum-tungsten alloy steel

Chemical Composition

Representative chemical composition requirements for commonly specified EN 10216-2 grades are shown below.

Other elements such as nickel, vanadium, aluminium, nitrogen, tungsten and niobium may be controlled according to the individual grade.

Mechanical Properties

Mechanical requirements can vary according to tube dimensions, wall thickness and delivery condition.

Elevated Temperature Properties

One of the main characteristics of EN 10216-2 is its requirement for specified elevated-temperature properties. These properties are particularly important for tubes exposed to continuous steam, hot gases, pressurized fluids and other high-temperature environments.

The applicable yield or proof strength values at elevated temperatures depend on the individual grade and temperature. Purchasers should specify the required operating temperature when selecting the material.

Impact Properties

Impact testing requirements apply to relevant grades and delivery conditions. Charpy V-notch testing is used to evaluate toughness, particularly where the tubes will experience low-temperature service or demanding pressure conditions.

Typical requirements include:

• Charpy V-notch testing where specified
• Controlled test temperature
• Minimum absorbed impact energy
• Testing according to the requirements of the applicable grade

Delivery Conditions

EN 10216-2 tubes can be supplied in specified heat-treatment conditions, including:

• Normalized
• Normalized and Tempered
• Quenched and Tempered
• Soft Annealed
• Other specified heat-treated conditions according to grade

The required delivery condition depends on the steel grade and intended service requirements.

Surface Finish

EN 10216-2 seamless tubes may be supplied with:

• Hot Finished Surface
• Cold Finished Surface
• Pickled Surface
• Descaled Surface
• Bright Surface
• Machined Surface where specified

The finished surface should be free from defects that could adversely affect compliance with the standard.

Standard Sizes

EN 10216-2 tubes are available in a wide range of outside diameters and wall thicknesses.

• Outside Diameter: As specified by order
• Wall Thickness: As specified by grade and application
• Length: Random or fixed lengths
• End Finish: Plain Ends
• Custom Dimensions: Available subject to manufacturing capability

Key Features

• Seamless construction
• Excellent pressure resistance
• Specified elevated-temperature properties
• Good high-temperature strength
• Good creep resistance in suitable alloy grades
• Reliable mechanical properties
• Suitable for steam and hot-fluid service
• Good weldability with appropriate procedures
• Wide range of non-alloy and alloy grades

Applications

Power Generation

• Boiler tubes
• Superheater tubes
• Reheater tubes
• Economizer tubes
• Steam piping
• Power plant pressure systems

Petrochemical Industry

• Process piping
• Furnace systems
• Refinery piping
• High-temperature process equipment
• Hydrocarbon processing systems

Chemical Industry

• Heat exchangers
• Process piping
• High-temperature reactors
• Pressure equipment
• Thermal processing systems

Boiler and Pressure Equipment

• Steam boilers
• Pressure vessels
• Heat recovery equipment
• High-temperature pressure lines
• Industrial heating systems

Fabrication and Welding

EN 10216-2 seamless tubes can be cut, bent, formed, machined and welded using suitable procedures. Welding requirements should be established according to the specific grade, wall thickness, service temperature and applicable fabrication code.

Chromium-molybdenum grades generally require greater control of preheating, interpass temperature and post-weld heat treatment than plain non-alloy grades.

Heat Treatment

Heat treatment is an important part of EN 10216-2 tube production. Depending on the grade, tubes may undergo normalizing, tempering, quenching and tempering or other specified treatments.

Correct heat treatment helps achieve the required combination of strength, toughness, hardness and elevated-temperature performance.

Testing and Inspection

EN 10216-2 tubes can be subjected to specified inspection and testing requirements, including:

• Chemical Analysis
• Tensile Testing
• Impact Testing
• Dimensional Inspection
• Visual Examination
• Leak-Tightness Testing
• Non-Destructive Testing where specified
• Elevated-Temperature Property Verification
• Material Identification
• Heat Number Traceability

Inspection certificates can be supplied according to purchaser requirements.

Advantages

• High pressure-bearing capability
• Excellent performance at elevated temperatures
• Seamless construction
• Good structural integrity
• Wide range of alloy compositions
• Suitable for boilers and power plants
• Good creep resistance for appropriate grades
• Reliable long-term performance
• Available in hot-finished and cold-finished conditions

EN 10216-2 Equivalent Materials

Depending on grade, EN 10216-2 materials may have comparable designations in other material standards. Common comparisons include:

• P235GH – comparable to pressure-vessel/boiler steels used in other European specifications
• P265GH – commonly compared with pressure-grade carbon steels such as ASTM A/SA 516 grades for certain applications
• 16Mo3 – widely recognized as a European molybdenum-alloy pressure steel
• 13CrMo4-5 – comparable in general material family to chromium-molybdenum pressure steels such as ASTM A335 P11/P12, subject to chemistry, dimensions and application requirements

Exact equivalence should always be confirmed from chemical composition, mechanical properties, dimensions and applicable design code rather than treating grades as automatically interchangeable.

Conclusion

EN 10216-2 seamless steel tubes are designed for pressure applications where specified elevated-temperature properties are required. The standard includes non-alloy grades such as P195GH, P235GH and P265GH together with alloy grades such as 16Mo3, 13CrMo4-5, 10CrMo5-5, 12CrMo9-10 and 10CrMo9-10.

These tubes are widely used in boilers, power-generation plants, heat exchangers, petrochemical facilities, refineries and high-temperature pressure systems. Ladhani Metal Corporation supplies EN 10216-2 seamless non-alloy and alloy steel tubes in required grades, sizes, wall thicknesses, lengths and delivery conditions.

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