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Introduction
EN 10216-3 specifies the technical delivery conditions for seamless circular steel tubes manufactured from alloy fine grain steels for pressure purposes. These tubes are designed to provide a combination of high strength, toughness, weldability and reliable performance under demanding pressure conditions.
EN 10216-3 seamless alloy fine grain steel tubes are used in pressure equipment, power-generation systems, industrial plants, process piping, boiler systems, heat exchangers and other engineering applications where high mechanical strength and toughness are required.
Ladhani Metal Corporation supplies EN 10216-3 seamless alloy fine grain steel tubes in required grades, outside diameters, wall thicknesses, lengths and delivery conditions.
Applicable Standard
EN 10216-3 – Seamless Steel Tubes for Pressure Purposes – Part 3: Alloy Fine Grain Steel Tubes.
The standard establishes requirements for chemical composition, mechanical properties, heat treatment, dimensions, testing, inspection and delivery conditions.
EN 10216-3 focuses on alloy fine grain steels used where pressure resistance, strength, toughness and reliable fabrication properties are important.
Material Type
EN 10216-3 covers seamless tubes manufactured from alloy fine grain steels.
- Alloy
Fine Grain Steel
- Fine
Grain Pressure Steel
- High-Strength
Fine Grain Steel
- Weldable
Fine Grain Steel
- Pressure
Equipment Steel
- Low-Temperature
Toughness Steel
The controlled chemical composition and fine grain structure provide a suitable combination of strength, toughness and weldability.
Forms of Supply
- Seamless
Alloy Steel Tubes
- Seamless
Fine Grain Steel Tubes
- Pressure
Tubes
- High-Strength
Steel Tubes
- Fine
Grain Pressure Tubes
- Boiler
Tubes
- Heat
Exchanger Tubes
- Process
Tubes
- High-Pressure
Tubes
- Low-Temperature
Service Tubes
- Hot
Finished Tubes
- Cold
Finished Tubes
- Cut-to-Length
Tubes
- Custom
Size Seamless Tubes
Grades Covered
P275 Grade Family
P275N | P275NH | P275NL1 | P275NL2
P355 Grade Family
P355N | P355NH | P355NL1 | P355NL2
P460 Grade Family
P460N | P460NH | P460NL1 | P460NL2
Higher Strength Grades
P620Q | P620QH | P620QL1 | P620QL2 | P690Q | P690QH | P690QL1 | P690QL2
The applicable grade range should be confirmed against the relevant edition of EN 10216-3 and the specific product requirements.
Grade Designation
- P
= Steel intended for pressure purposes
- N
= Normalized delivery condition
- NH
= Normalized fine grain steel with specified elevated-temperature
properties
- NL1
= Fine grain steel with specified low-temperature toughness
- NL2
= Fine grain steel with enhanced low-temperature toughness requirements
- Q
= Quenched and tempered steel
- QH
= Quenched and tempered steel with specified elevated-temperature
properties
- QL1
= Quenched and tempered steel with specified low-temperature toughness
- QL2
= Quenched and tempered steel with enhanced low-temperature toughness
The exact meaning and delivery condition should be verified against the applicable grade and edition of the standard.
Chemical Composition
EN 10216-3 grades have controlled chemical compositions designed to achieve high strength, fine grain structure, toughness and suitable weldability.
Representative chemical composition requirements for commonly specified grade families are shown below.
|
Grade |
C Max. % |
Si Max. % |
Mn % |
P Max. % |
S Max. % |
Cr Max. % |
Mo Max. % |
Ni Max. % |
|
P275N |
0.18 |
0.40 |
0.90–1.60 |
0.025 |
0.020 |
0.30 |
0.10 |
0.30 |
|
P275NH |
0.18 |
0.40 |
0.90–1.60 |
0.025 |
0.020 |
0.30 |
0.10 |
0.30 |
|
P275NL1 |
0.18 |
0.40 |
0.90–1.60 |
0.025 |
0.020 |
0.30 |
0.10 |
0.30 |
|
P275NL2 |
0.18 |
0.40 |
0.90–1.60 |
0.025 |
0.020 |
0.30 |
0.10 |
0.30 |
|
P355N |
0.20 |
0.50 |
1.10–1.70 |
0.025 |
0.020 |
0.30 |
0.10 |
0.30 |
|
P355NH |
0.20 |
0.50 |
1.10–1.70 |
0.025 |
0.020 |
0.30 |
0.10 |
0.30 |
|
P355NL1 |
0.20 |
0.50 |
1.10–1.70 |
0.025 |
0.020 |
0.30 |
0.10 |
0.30 |
|
P355NL2 |
0.20 |
0.50 |
1.10–1.70 |
0.025 |
0.020 |
0.30 |
0.10 |
0.30 |
|
P460N |
0.20 |
0.50 |
1.10–1.70 |
0.025 |
0.020 |
0.30 |
0.10 |
0.80 |
|
P460NH |
0.20 |
0.50 |
1.10–1.70 |
0.025 |
0.020 |
0.30 |
0.10 |
0.80 |
|
P460NL1 |
0.20 |
0.50 |
1.10–1.70 |
0.025 |
0.020 |
0.30 |
0.10 |
0.80 |
|
P460NL2 |
0.20 |
0.50 |
1.10–1.70 |
0.025 |
0.020 |
0.10 |
0.10 |
0.80 |
Other alloying and microalloying elements may include aluminium, niobium, titanium, vanadium, copper and nitrogen, depending on the individual grade.
Chemical limits should always be verified against the applicable EN 10216-3 grade and edition.
Mechanical Properties
The mechanical properties of EN 10216-3 tubes depend on the grade, wall thickness and delivery condition.
|
Grade |
Yield Strength Min. MPa |
Tensile Strength MPa |
Elongation Min. % |
|
P275N |
275 |
390–510 |
22 |
|
P275NH |
275 |
390–510 |
22 |
|
P275NL1 |
275 |
390–510 |
22 |
|
P275NL2 |
275 |
390–510 |
22 |
|
P355N |
355 |
490–630 |
21 |
|
P355NH |
355 |
490–630 |
21 |
|
P355NL1 |
355 |
490–630 |
21 |
|
P355NL2 |
355 |
490–630 |
21 |
|
P460N |
460 |
570–720 |
17 |
|
P460NH |
460 |
570–720 |
17 |
|
P460NL1 |
460 |
570–720 |
17 |
|
P460NL2 |
460 |
570–720 |
17 |
Mechanical requirements may vary according to wall thickness, grade and delivery condition. Certified values should be used for engineering and pressure-equipment design.
Fine Grain Structure
Fine grain structure is a major characteristic of EN 10216-3 alloy steel tubes.
The refined grain structure helps improve toughness and contributes to the required combination of strength and ductility. Controlled additions of grain-refining elements such as niobium, titanium and aluminium may be used depending on the grade.
Fine grain steels are particularly useful in pressure applications where resistance to brittle fracture and reliable fabrication performance are important.
Low-Temperature Properties
EN 10216-3 includes grade designations intended for applications requiring specified low-temperature toughness.
The NL1 and NL2 grades provide specified impact toughness at low temperatures. These grades are suitable for equipment and piping exposed to reduced operating or ambient temperatures.
The required test temperature and impact energy depend on the individual grade and designation.
Delivery Conditions
EN 10216-3 seamless tubes are supplied in specified heat-treatment conditions according to the individual grade.
- Normalized
- Normalized
and Tempered where specified
- Quenched
and Tempered for applicable grades
- Other
specified heat-treated conditions
The delivery condition is selected to achieve the required strength, toughness and structural properties.
Surface Finish
EN 10216-3 seamless tubes may be supplied with different surface conditions according to manufacturing and purchaser requirements.
- Hot
Finished Surface
- Cold
Finished Surface
- Pickled
Surface
- Descaled
Surface
- Bright
Surface
- Machined
Surface where specified
The tube surface should be free from imperfections that could adversely affect compliance with the specified requirements.
Dimensions and Sizes
EN 10216-3 tubes are available in various outside diameters and wall thicknesses according to dimensional requirements and purchaser specifications.
- Outside
Diameter: As specified by order
- Wall
Thickness: As specified by grade and dimensional requirements
- Length:
Random or fixed lengths
- End
Finish: Plain Ends
- Custom
Dimensions: Available subject to manufacturing capability
Dimensional tolerances are controlled according to the requirements of the applicable standard and ordered product dimensions.
Key Features
- Seamless
construction
- Alloy
fine grain steel structure
- High
yield strength
- High
tensile strength
- Excellent
toughness
- Good
weldability
- High
pressure resistance
- Good
resistance to brittle fracture
- Suitable
for low-temperature service
- Reliable
mechanical properties
- Controlled
chemical composition
- Wide
range of strength levels
- Suitable
for demanding pressure applications
Applications
Power Generation
- Boiler
pressure systems
- Steam
piping
- Power
plant piping
- Heat
recovery systems
- Pressure
equipment
- High-strength
piping systems
Pressure Equipment
- Pressure
vessels
- High-pressure
equipment
- Process
vessels
- Storage
systems
- Pressure
piping
- Industrial
pressure systems
Oil and Gas Industry
- Process
piping
- High-pressure
piping
- Gas
processing systems
- Oil
processing equipment
- Refinery
piping
- Hydrocarbon
processing systems
Chemical and Petrochemical Industry
- Process
piping
- Heat
exchangers
- Chemical
processing equipment
- Pressure
systems
- Industrial
reactors
- Petrochemical
process equipment
Low-Temperature Applications
- Cold-service
piping
- Low-temperature
pressure systems
- Refrigeration-related
process equipment
- Low-temperature
storage systems
- Process
equipment operating under reduced temperatures
Fabrication and Welding
EN 10216-3 alloy fine grain steel tubes can be cut, formed, bent, machined and welded using suitable procedures.
Welding parameters should be selected according to the specific grade, wall thickness, carbon equivalent, preheating requirements, interpass temperature and applicable fabrication code.
Higher-strength grades require careful control of welding heat input and thermal cycles to maintain the required mechanical and toughness properties.
Heat Treatment
Heat treatment is an important part of EN 10216-3 tube production.
Depending on the grade and specified delivery condition, tubes may undergo normalizing, normalizing and tempering, or quenching and tempering.
Correct heat treatment helps achieve the required combination of yield strength, tensile strength, toughness and structural stability.
Advantages
- High
strength-to-weight performance
- Excellent
toughness
- Fine
grain microstructure
- Good
weldability
- Reliable
pressure resistance
- Suitable
for demanding pressure applications
- Good
low-temperature performance
- Wide
range of strength levels
- Good
resistance to brittle fracture
- Consistent
mechanical properties
- Suitable
for power-generation systems
- Suitable
for pressure equipment
- Available
in different delivery conditions
Conclusion
EN 10216-3 seamless steel tubes are alloy fine grain steel tubes designed for pressure applications where high strength, toughness and reliable fabrication properties are required. The standard covers important grade families including P275, P355 and P460, along with applicable higher-strength fine grain grades.
These seamless tubes are used in pressure equipment, power-generation plants, oil and gas facilities, chemical and petrochemical plants, process piping, heat exchangers and low-temperature service systems.
Ladhani Metal Corporation supplies EN 10216-3 seamless alloy fine grain steel tubes in required grades, outside diameters, wall thicknesses, lengths and delivery conditions. Tubes can be supplied according to project specifications and purchaser requirements.
FOR REQUIREMENT OF THIS GRADE OR FOR DETAIL CONTACT US AT :-
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