EN10216 European Standard Introduction
EN10216 is a general standard for seamless pressure pipes within the European Union, divided into five parts, covering technical and process conditions for seamless steel pipes for various purposes. Among them, EN10216-2 applies to seamless non-alloy and alloy steel pipes with specified high-temperature performance, detailing requirements for such pipes in high-temperature environments, including chemical composition, mechanical properties, and manufacturing processes. Each part specifically lists the steel grades under that category, their upper and lower limits of chemical composition, mechanical performance indicators (at room temperature and high temperature), heat treatment status, and specific inspection requirements.
Standard Technical Requirements
Chemical Composition of Steel Pipe Materials: Strictly specifies the content range of each material's carbon (C), silicon (Si), manganese (Mn), phosphorus (P), sulfur (S), and other alloy elements (such as Cr, Mo, Ni, V, etc.).
Manufacturing Process: Steel pipes must be manufactured using seamless processes, such as hot rolling, cold drawing, etc.
Heat Treatment Status: Specifies the heat treatment status that steel pipes must undergo before delivery:
+N: Normalizing
+NT: Normalizing + Tempering
+Q: Quenching
+QT: Quenching + Tempering (Tempering)
+A: Solution Annealing (mainly used for stainless steel)
Mechanical Properties:
Room Temperature Performance: Tensile strength (Rm), upper/lower yield strength or specified plastic extension strength (ReH/ReL/Rp0.2), elongation after fracture (A).
Process Tests:
Flattening Test: Tests the ductility and plastic deformation capability of steel pipes.
Flaring Test: Tests the expansion deformation capability of pipe ends.
Bending Test: Tests the bending performance of steel pipes.
Hydrostatic Test: A mandatory project. Every steel pipe must undergo a hydrostatic test to test its ability to withstand rated pressure, with the test pressure determined based on the size and grade of the steel pipe.
Non-Destructive Testing: Eddy current testing (ECT) is usually required. For higher quality requirements, ultrasonic testing (UT) can be optionally performed to detect longitudinal defects, or magnetic flux leakage testing (FT) can be performed to detect transverse defects.
EN10216 and its Relationship with and Differences from Related Standards
EN 10217: This is the technical delivery conditions for welded steel tubes for pressure purposes. EN 10216 and EN 10217 are two parallel series, one for seamless tubes and the other for welded tubes.
EN ISO 1127 / EN ISO 4200: These are the dimensional standards for steel tubes (outer diameter, wall thickness series). The dimensions of EN 10216 tubes must comply with these basic standards.
PED (Pressure Equipment Directive 2014/68/EU): EN 10216 is a harmonized standard. Compliance with this standard is deemed to meet the basic safety requirements of the EU PED and is an important basis for affixing the CE marking to products.
ASTM/ASME Standards: This is the American standard system. Many steel grades in EN 10216 have similar or corresponding designations in ASTM/ASME standards (for example, 13CrMo4-5 in EN 10216-2 is similar to ASTM A335 P12, and P235GH is similar to ASTM A106 Gr.B). However, there may be differences in technical requirements, inspection methods, and acceptance criteria, and they cannot be considered completely equivalent.
Dimensions and Tolerances of EN10216-2 European Standard Seamless Tubes
EN10216-2 European standard seamless tubes have a wide range of dimensions, with outer diameters typically ranging from 10.2mm to 711mm and wall thicknesses ranging from 1.6mm to 100mm. This diverse range of sizes fully meets the pressure-bearing requirements of different pipeline projects in terms of outer diameter and wall thickness. At the same time, its dimensional tolerance control is extremely strict, ensuring the tightness and interchangeability of pipeline connections, thereby improving construction efficiency and the overall quality of the system.
Tolerance range of outer diameter and wall thickness
|
Outside Diameter D mm |
Tolerances on D |
Tolerances on T for a T/D ratio |
|||
|
≤ 0,025 |
> 0,025 |
> 0,050 |
> 0,10 |
||
|
≤ 0,050 |
≤ 0,10 |
||||
|
D ≤ 219,1 |
± 1% or ± 0.5mm |
± 12,5% or ± 0.4mm whichever is the greater |
|||
|
D > 219,1 |
whichever is the greater |
± 20% |
± 15% |
± 12,5% |
± 10% a |
|
a For outside diameters D ≥ 355,6 mm it is permitted to exceed the upper wall thickness locally by a further 5% of the wall thickness T |
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Inner diameter and wall thickness tolerance range
|
Tolerances on inside diameter |
Tolerances on T for a T/d ratio |
|||||
|
d |
d min |
≤ 0,03 |
> 0,03 |
> 0,06 |
> 0,12 |
|
|
≤ 0,06 |
≤ 0,12 |
|||||
|
± 1% or ± 2 mm whichever is the greater |
(+ 2% ,0)or (+ 4 mm,0) |
whichever is the greater |
± 20% |
± 15% |
± 12,5% |
± 10% a |
|
a For outside diameters D ≥ 355,6 mm it is permitted to exceed the upper wall thickness locally by a further 5% of the wall thickness T |
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Length tolerance range
|
Length L |
Tolerance on exact length |
|
L ≤ 6000 |
10 |
|
0 |
|
|
6000 < L ≤ 12 000 |
15 |
|
0 |
|
|
L > 12 000 |
+ by agreement |
|
0 |
Material Performance Characteristics
High Strength and Good Toughness: The seamless pipes under this standard undergo strict material selection, with a rational combination of non-alloy and alloy steels, endowing them with high strength. For example, the P235GH grade achieves 360-500 MPa tensile strength, ≥235 MPa yield strength, and ≥25% elongation at room temperature. This ensures structural stability under high-pressure conditions while preventing deformation or rupture. The material's excellent toughness also resists brittle fracture under impact loads, significantly enhancing pipeline safety.
Superior High-Temperature Performance: Specifically designed for high-temperature applications (EN10216-2), these pipes maintain stable mechanical properties in elevated temperatures, ensuring operational continuity in industrial settings.
Effective Corrosion Resistance: Optimized alloy composition in certain EN10216-2 pipes provides chemical erosion resistance, extending service life and reducing maintenance costs.
chemical composition
| Steel grades |
C% max |
Si% max |
Mn% max |
P% max |
S% max |
Cr% max |
Mo% max |
Ni% max |
Al.cał% min |
Cu% max |
Nb% max |
Ti% max |
V% max |
Cr+ Cu+ Mo+ Ni% MAX |
|
P195GH |
0.13 |
0.35 |
0.7 |
0.025 |
0.02 |
0.3 |
0.08 |
0.3 |
≥ 0.020 |
0.3 |
0.01 |
0.04 |
0.02 |
0.7 |
|
P235GH |
0.16 |
0.35 |
1,20 |
0.025 |
0.02 |
0.3 |
0.08 |
0.3 |
≥ 0.020 |
0.3 |
0.01 |
0.04 |
0.02 |
0.7 |
|
P265GH |
0.2 |
0.4 |
1,40 |
0.025 |
0.02 |
0.3 |
0.08 |
0.3 |
≥ 0.020 |
0.3 |
0.01 |
0.04 |
0.02 |
0.7 |
|
16Mo3 |
0.12- 0.20 |
0.35 |
0.40- 0.70 |
0.025 |
0.02 |
0.3 |
0.25- 0.35 |
0.3 |
≥ 0.020 |
0.3 |
- |
- |
- |
- |
|
14MoV6-3 |
0.10- 0.15 |
0.15- 0.35 |
0.40- 0.70 |
0.025 |
0.02 |
0.30- 0.60 |
0.50- 0.70 |
0.3 |
≥ 0.020 |
0.3 |
- |
0.22-0.28 |
- |
- |
|
13CrMo4-5 |
0.15 |
0.50- 1,00 |
0.30- 0.60 |
0.025 |
0.02 |
1,00- 1,50 |
0.45- 0.65 |
0.3 |
≥ 0.020 |
0.3 |
- |
- |
- |
- |
|
10CrMo9-10 |
0.10- 0.17 |
0.35 |
0.40- 0.70 |
0.025 |
0.02 |
0.70- 1,15 |
0.40- 0.60 |
0.3 |
≥ 0.020 |
0.3 |
- |
- |
- |
- |
Mechanical properties
|
Steel grades |
Mechanical properties during tensile testing in room temperature |
Resilience |
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|
Upper yield limit or yield strength Re or R0.2 for wall thickness of t min |
Tensile strength Rm |
Minimum energy average absorbed KVJ at the temperature of 0°C |
||||||||||
|
T≤16 |
16<T≤40 |
40<t≤60 |
60<T≤60 |
Elongation A min% |
I |
T |
||||||
|
MPa |
MPa |
MPa |
MPa |
MPa |
I |
t |
20 |
0 |
-10 |
20 |
0 |
|
|
P195GH |
195 |
- |
- |
- |
320- 440 |
27 |
25 |
- |
40 |
28 |
- |
27 |
|
P235GH |
235 |
225 |
215 |
- |
360- 500 |
25 |
23 |
- |
40 |
28 |
- |
27 |
|
P265GH |
265 |
255 |
245 |
- |
410- 570 |
23 |
21 |
- |
40 |
28 |
- |
27 |
|
16Mo3 |
280 |
270 |
260 |
- |
450- 600 |
22 |
20 |
40 |
- |
- |
27 |
- |
|
14MoV6-3 |
320 |
320 |
310 |
- |
460- 610 |
20 |
18 |
40 |
- |
- |
27 |
- |
|
13CrMo4-5 |
290 |
290 |
280 |
- |
440- 590 |
22 |
20 |
40 |
- |
- |
27 |
- |
|
10CrMo9-10 |
280 |
280 |
270 |
- |
480- 630 |
22 |
20 |
40 |
- |
- |
27 |
- |
Production Process Requirements
Strict Raw Material Selection: The chemical composition and mechanical properties of raw materials used for producing EN10216-2 European standard seamless tubes must meet the standard's parameter requirements for materials.
Advanced Production Technology:
Piercing: High-precision equipment ensures accurate piercing of solid billets into hollow rough tubes.
Rolling: Optimizes the internal microstructure of the steel tubes.
Sizing: Guarantees precise outer diameter dimensions, meeting stringent size requirements for diverse applications.
Heat Treatment: A critical process for enhancing performance. By precisely controlling heating temperature, holding time, and cooling rates, the steel's microstructure is refined, improving strength, toughness, and corrosion resistance to comply with high-temperature performance standards.
Comprehensive Quality Testing: Advanced non-destructive testing techniques (e.g., ultrasonic testing, eddy current testing) ensure defect-free products, free from cracks or blowholes.
Competitive Advantages of EN10216-2 Seamless Tubes
Safety & Reliability: Exceptional material properties and rigorous production ensure stable operation under complex conditions, minimizing failure risks.
Longevity: High corrosion resistance and strength extend service life, reducing replacement costs and downtime.
Precision Installation: Tight dimensional tolerances simplify installation, improving efficiency and reducing construction expenses.
Applications
Power Industry: Used in superheater tubes, reheater tubes, and water wall tubes of power plant boilers, withstanding high-temperature steam.
Chemical Industry: Transports corrosive or flammable media (e.g., crude oil pipelines in petrochemical plants), ensuring safety through corrosion resistance.
Mechanical Manufacturing: Serves hydraulic/pneumatic systems in high-precision equipment, ensuring stable medium transmission.
Energy Sector: Critical for natural gas/oil pipelines, enabling secure and efficient energy transport.