EN 10216-2 SEAMLESS STEEL PIPE

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EN 10216-2 SEAMLESS STEEL PIPE FOR PRESSURE PURPOSES

EN 10216-2 is a European standard that specifies the technical delivery conditions for seamless steel tubes used for pressure purposes. These tubes are typically made from non-alloy and alloy steel grades, and they are used in a wide range of high-pressure applications, such as power generation, petrochemical, and process industries.

The EN 10216-2 standard covers various aspects, including the manufacturing process, quality control, and testing requirements. It also outlines specific steel grades and their corresponding mechanical properties.

Steel Grades:

The EN 10216-2 standard includes a range of steel grades, including non-alloy and alloy steel grades. Some of the commonly used grades are:

  • P235GH: Non-alloy steel, typically used in low to medium pressure applications
  • P265GH: Non-alloy steel, typically used in medium to high-pressure applications
  • 16Mo3: Alloy steel with molybdenum, often used in high-temperature and high-pressure applications
  • 13CrMo4-5: Chromium-molybdenum alloy steel, commonly used in high-temperature and high-pressure applications, such as power plants and process industries

Mechanical Properties:

The mechanical properties of EN 10216-2 seamless steel tubes depend on the specific steel grade being used. Some of the key mechanical properties include tensile strength, yield strength, and elongation. These properties ensure the tubes can withstand the required pressure and temperature conditions in various applications.

Applications:

EN 10216-2 seamless steel tubes are used in a wide range of high-pressure applications, including:

  1. Power generation: These tubes are used in boilers, heat exchangers, and superheaters in power plants, where they need to withstand high temperatures and pressures.
  2. Petrochemical industry: EN 10216-2 tubes are employed in refineries and petrochemical plants for processes like cracking, reforming, and distillation, which require materials with high resistance to heat and pressure.
  3. Process industries: These tubes are also used in the chemical, pharmaceutical, and food processing industries, where high-pressure and corrosion-resistant materials are required.
  4. Pressure equipment: EN 10216-2 tubes are utilized in the manufacturing of pressure vessels, high-pressure storage tanks, and pipeline systems.

To ensure optimal performance and safety in high-pressure applications, it is crucial to select the appropriate steel grade and follow the guidelines outlined in the EN 10216-2 standard.

EN 10216-2 Chemical Composition:

Steel grades EN10216-2 CHEMICAL COMPOSITION (LADLE ANALYSIS)
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 0.70 0.025 0.020 0.30 0.08 0.30 ≥ 0.020 0.30 0.010 0.040 0.02 0.70
P235GH 0.16 0.35 1,20 0.025 0.020 0.30 0.08 0.30 ≥ 0.020 0.30 0.010 0.040 0.02 0.70
P265GH 0.20 0.40 1,40 0.025 0.020 0.30 0.08 0.30 ≥ 0.020 0.30 0.010 0.040 0.02 0.70
16Mo3 0.12- 0.20 0.35 0.40- 0.70 0.025 0.020 0.30 0.25- 0.35 0.30 ≥ 0.020 0.30
14MoV6-3 0.10- 0.15 0.15- 0.35 0.40- 0.70 0.025 0.020 0.30- 0.60 0.50- 0.70 0.30 ≥ 0.020 0.30 0.22-0.28
13CrMo4-5 0.15 0.50- 1,00 0.30- 0.60 0.025 0.020 1,00- 1,50 0.45- 0.65 0.30 ≥ 0.020 0.30
10CrMo9-10 0.10- 0.17 0.35 0.40- 0.70 0.025 0.020 0.70- 1,15 0.40- 0.60 0.30 ≥ 0.020 0.30

EN 10216-2 Mechanical Property:

EN 10216-2 Mechanical properties
Steel grades Mechanical properties during tensile testing in room temperature Resilience
Upper yield limit or yield strength Re or R0.2 for wall thickness of t min Tensile strength Rm Elongation A min% Minimum energy average absorbed KVJ at the temperature of 0°C
T≤16 16<T≤40 40<t≤60 60<T≤60 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

EN 10216-2 Equivalent steel grade:

Steel Grade Steel Standard Steel Grade Steel Standard Steel Grade
P235GH DIN 17175 St 35.8
P265GH DIN 17175 St 45.8
16Mo3 DIN 17175 15Mo3
10CrMo55 15Mo3 BS 3606 621
13CrMo45 DIN 17175 BS 3606 620
10CrMo910 DIN 17175 13CrMo44 BS 3606 622
25CrMo4 10CrMo910
P355N DIN 17179 StE 355
P355NH DIN 17179 TStE 355
P355NL1 DIN 17179 WStE 460
P460N DIN 17179 TStE 460
P460NH DIN 17179 WStE 460
P460NL1 DIN 17179 TStE 460

 

Dimension for EN10216-2 Steel pipe

EN 10216-2 Outside diameter and wall thickness tolerances
Outside diameter D mm Permissible deviations of outside diameter D Permissible deviations of wall thickness t depending on the T/D ratio
≤0.025 >0.025
≤0.050
>0.050
≤0.10
>0.10
D≤219,1 +\- 1% or =\- 0.5mm depending on which is greater +\- 12,5% or 0.4 mm depending on which is greater
D>219,1 =\- 20% =\- 15% =\- 12,5% =\- 10%
For the outside diameter of D≥355,6 mm, local deviation outside of the upper deviation limit by further 5% of the wall thickness T is permitted

 

EN 10216-2 Inside diameter and wall thickness tolerances
Permissible deviations of inside diameter Permissible T deviations depending on the T/d ratio
d dmin <\-0.03 >0.03
≤0.06
>0.06
≤0.12
>0.12
+\- 1% or +\- 2mm depending on which is greater +2% +4mm
depending on which is greater
+\-20% +\-15% +\-12,5% +\-10%
For the outside diameter of D≥355,6 mm, local deviation outside of the upper deviation limit by further 5% of the wall thickness T is permitted

 Inspection and Test For EN 10216-2 Steel Pipe

Inspection and test type Test frequency Test category
Mandatory tests Ladle analysis One per ladle 1 2
Tensile testing in room temperature One per every test pipe X X
Flattening test for D<600mm and the ratio of D≤0.15 but T≤40mm or ring testing for D>150mm and T ≤40mm X X
Rolling test on a mandrel bar for D≤150mm and T≤10mm or ring testing for D≤114,3mm and T ≤12,5mm X X
Resilience testing at the temperature of 20 ºC X X
Tightness testing Every pipe X X
Dimensional testing X X
Visual inspection X X
NDT in order to identify longitudinal discontinuity Every pipe X X
Material identification for alloy steel X X
Optional tests Final product analysis One per ladle X X
Tensile testing at elevated temperature One per ladle and for the same thermal processing conditions X X
Resilience testing One per every test pipe X X
Resilience testing in the machine direction at the temperature of -10ºC for non-alloy steel grades X X
Wall thickness measurement at a distance from pipe ends X X
NDT in order to identify transverse discontinuity Every pipe X X
NDT in order to identify delamination X X

What is the difference between EN 10216-2 P235GH and EN P265GH ?

EN 10216-2 P235GH and P265GH are both non-alloy steel grades specified under the European standard EN 10216-2 for seamless steel tubes used in pressure applications. Although they share some similarities, there are some differences in their chemical compositions and mechanical properties, which affect their suitability for specific applications.

Chemical Composition:

The chemical compositions of P235GH and P265GH are similar, but they have some differences in their carbon, manganese, and silicon content.

  • P235GH:
    • Carbon (C): ≤ 0.16%
    • Manganese (Mn): 0.60 – 1.20%
    • Silicon (Si): ≤ 0.35%
    • Phosphorus (P): ≤ 0.025%
    • Sulfur (S): ≤ 0.015%
    • Nitrogen (N): ≤ 0.012%
  • P265GH:
    • Carbon (C): ≤ 0.20%
    • Manganese (Mn): 0.80 – 1.40%
    • Silicon (Si): ≤ 0.40%
    • Phosphorus (P): ≤ 0.025%
    • Sulfur (S): ≤ 0.020%
    • Nitrogen (N): ≤ 0.012%

As seen from the chemical compositions, P265GH has a higher carbon content, manganese content, and silicon content compared to P235GH.

Mechanical Properties:

The mechanical properties of P235GH and P265GH also differ, with P265GH generally having higher tensile strength, yield strength, and better resistance to heat and pressure.

  • P235GH:
    • Tensile Strength: 360 – 500 MPa
    • Yield Strength: ≥ 235 MPa
    • Elongation: ≥ 25%
  • P265GH:
      • Tensile Strength: 410 – 570 MPa
    • Yield Strength: ≥ 265 MPa
    • Elongation: ≥ 23%

The higher mechanical properties of P265GH make it more suitable for high-pressure and high-temperature applications compared to P235GH.

Applications:

  • P235GH is typically used in low to medium pressure applications, such as low-pressure steam systems, heating systems, and water systems. It is also used in the manufacturing of pressure vessels, storage tanks, and pipeline systems with low to medium pressure requirements.
  • P265GH is more suitable for medium to high-pressure applications, such as high-pressure steam systems, power generation, and process industries that require materials with better resistance to heat and pressure. It is commonly used in the manufacturing of pressure vessels, high-pressure storage tanks, and high-pressure pipeline systems.

In conclusion, the main differences between EN 10216-2 P235GH and P265GH lie in their chemical compositions and mechanical properties. P265GH generally has higher strength and better resistance to heat and pressure, making it more suitable for high-pressure and high-temperature applications compared to P235GH. However, the choice between P235GH and P265GH should always be based on the specific requirements of the application to ensure optimal performance and longevity.

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