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Introduction
EN 10216-4 specifies the technical delivery conditions for seamless circular steel tubes manufactured from non-alloy and alloy steels with specified low-temperature properties. These tubes are intended for pressure purposes where resistance to low temperatures, adequate toughness and reliable mechanical properties are required.
EN 10216-4 seamless steel tubes are used in pressure equipment, low-temperature piping, storage systems, process plants, refrigeration systems, chemical plants and other applications where tubes may operate under reduced-temperature conditions.
Ladhani Metal Corporation supplies EN 10216-4 seamless steel tubes in required grades, dimensions, wall thicknesses, lengths and delivery conditions.
Applicable Standard
EN 10216-4 – Seamless Steel Tubes for Pressure Purposes – Part 4: Non-Alloy and Alloy Steel Tubes with Specified Low-Temperature Properties.
The standard establishes requirements for chemical composition, mechanical properties, low-temperature toughness, heat treatment, dimensions, testing and inspection.
EN 10216-4 focuses on seamless pressure tubes where reliable performance at reduced temperatures is an important material requirement.
Material Type
EN 10216-4 covers seamless tubes manufactured from
non-alloy and alloy steels with specified low-temperature properties.
- Non-Alloy
Steel
- Alloy
Steel
- Fine
Grain Steel
- Low-Temperature
Pressure Steel
- Weldable
Pressure Steel
- Low-Temperature
Service Steel
The controlled chemical composition and specified toughness characteristics provide a suitable combination of strength, ductility and low-temperature performance.
Forms of Supply
- Seamless
Steel Tubes
- Seamless
Pressure Tubes
- Non-Alloy
Steel Tubes
- Alloy
Steel Tubes
- Low-Temperature
Steel Tubes
- Pressure
Equipment Tubes
- Boiler
Tubes
- Heat
Exchanger Tubes
- Process
Tubes
- Cold-Service
Tubes
- Hot
Finished Tubes
- Cold
Finished Tubes
- Cut-to-Length
Tubes
- Custom
Size Seamless Tubes
Grades Covered
P215 Grade
P215NL
P255 Grade
P255QL
P275 Grade Family
P275NL1 | P275NL2
P355 Grade Family
P355NL1 | P355NL2
P460 Grade Family
P460NL1 | P460NL2
The applicable grade range should be confirmed against the relevant edition of EN 10216-4 and the specific product requirements.
Grade Designation
- P
= Steel intended for pressure purposes
- N
= Normalized condition
- NL
= Steel with specified low-temperature properties
- Q
= Quenched and tempered condition
- QL
= Quenched and tempered steel with specified low-temperature properties
The exact designation and delivery condition depend on the individual grade and applicable requirements of the standard.
Chemical Composition
EN 10216-4 grades have controlled chemical compositions designed to provide the required combination of strength, toughness, weldability and low-temperature performance.
Representative chemical composition requirements for commonly specified grades are shown below.
|
Grade |
C Max. % |
Si Max. % |
Mn % |
P Max. % |
S Max. % |
Cr Max. % |
Mo Max. % |
Ni Max. % |
|
P215NL |
0.16 |
0.35 |
0.40–1.20 |
0.025 |
0.020 |
— |
— |
— |
|
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 |
|
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 |
|
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 |
0.30 |
0.10 |
0.80 |
Other controlled alloying and microalloying elements may include aluminium, niobium, titanium, vanadium, copper and nitrogen depending on the individual grade.
Chemical composition limits should be verified against the applicable EN 10216-4 grade and standard edition.
Mechanical Properties
The mechanical properties of EN 10216-4 seamless tubes depend on the grade, wall thickness and delivery condition.
|
Grade |
Yield Strength Min. MPa |
Tensile Strength MPa |
Elongation Min. % |
|
P215NL |
215 |
350–480 |
25 |
|
P275NL1 |
275 |
390–510 |
22 |
|
P275NL2 |
275 |
390–510 |
22 |
|
P355NL1 |
355 |
490–630 |
21 |
|
P355NL2 |
355 |
490–630 |
21 |
|
P460NL1 |
460 |
570–720 |
17 |
|
P460NL2 |
460 |
570–720 |
17 |
Mechanical requirements can vary according to tube wall thickness, grade and delivery condition. Certified material values should be used for engineering and pressure-equipment calculations.
Low-Temperature Properties
Low-temperature performance is one of the main characteristics of EN 10216-4 seamless steel tubes.
The standard includes grades with specified toughness requirements at reduced temperatures. These properties are important for pressure equipment and piping systems exposed to low operating or ambient temperatures.
The applicable impact test temperature and minimum absorbed energy depend on the individual grade and designation.
Fine Grain Structure
Fine grain characteristics can provide an effective combination of strength and toughness in applicable EN 10216-4 grades.
Controlled grain refinement and microalloying can contribute to improved toughness and resistance to brittle fracture.
Elements such as aluminium, niobium and titanium may be used for grain refinement depending on the individual steel grade.
Delivery Conditions
EN 10216-4 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 according to the required mechanical properties and low-temperature performance.
Surface Finish
EN 10216-4 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 finished surface should be free from imperfections that could adversely affect the performance or compliance of the tubes.
Dimensions and Sizes
EN 10216-4 seamless steel tubes are available in various
outside diameters and wall thicknesses according to applicable dimensional
requirements.
- 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 applicable requirements of the standard.
Key Features
- Seamless
construction
- Specified
low-temperature properties
- Excellent
toughness
- Good
pressure resistance
- Reliable
mechanical properties
- Good
weldability
- Controlled
chemical composition
- Suitable
for cold-service applications
- Good
resistance to brittle fracture
- Wide
range of pressure grades
- Suitable
for demanding industrial environments
- Available
in different delivery conditions
Applications
Oil and Gas Industry
- Low-temperature
process piping
- Gas
processing systems
- Oil
processing equipment
- Hydrocarbon
processing systems
- Refinery
piping
- Pressure
piping
Chemical and Petrochemical Industry
- Process
piping
- Heat
exchangers
- Chemical
processing equipment
- Pressure
systems
- Storage
systems
- Low-temperature
process equipment
Pressure Equipment
- Pressure
vessels
- Pressure
piping
- Storage
equipment
- Industrial
pressure systems
- Process
vessels
- Low-temperature
pressure equipment
Refrigeration and Cold Service
- Refrigeration
systems
- Cold-service
piping
- Low-temperature
process lines
- Cooling
systems
- Cold
storage process systems
- Low-temperature
industrial equipment
Power Generation
- Pressure
piping
- Boiler
systems
- Heat
recovery equipment
- Industrial
power equipment
- Pressure
systems
- Process
piping
Fabrication and Welding
EN 10216-4 seamless steel tubes can be cut, formed, bent, machined and welded using suitable procedures.
Welding procedures should be selected according to the specific grade, wall thickness, carbon equivalent, preheating requirements, interpass temperature and applicable fabrication code.
For low-temperature applications, welding procedures should maintain the required toughness and mechanical properties of the weld and heat-affected zones.
Heat Treatment
Heat treatment is an important part of EN 10216-4 tube production.
Depending on the grade and specified delivery condition, tubes may undergo normalizing, normalizing and tempering, or quenching and tempering.
Appropriate heat treatment helps achieve the required combination of yield strength, tensile strength, ductility, toughness and low-temperature performance.
Advantages
- Excellent
low-temperature toughness
- High
pressure-bearing capability
- Seamless
construction
- Good
resistance to brittle fracture
- Reliable
mechanical properties
- Good
weldability
- Suitable
for pressure equipment
- Suitable
for cold-service applications
- Wide
range of strength levels
- Controlled
chemical composition
- Good
structural integrity
- Suitable
for demanding industrial environments
- Reliable
performance at reduced temperatures
Conclusion
EN 10216-4 seamless steel tubes are designed for pressure applications where specified low-temperature properties, toughness and reliable mechanical performance are required. The standard covers seamless tubes manufactured from non-alloy and alloy steels with controlled chemical composition and mechanical properties.
These tubes are suitable for oil and gas facilities, chemical and petrochemical plants, pressure equipment, refrigeration systems, cold-service piping, process plants and other industrial applications involving reduced operating temperatures.
Ladhani Metal Corporation supplies EN 10216-4 seamless non-alloy and alloy 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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