EN 10216-2 1.7386 X11CrMo9-1 Seamless Steel Tubes

Short Description:

X11CrMo9-1+NT is a 9-12% chromium-based martensitic heat-resistant alloy steel, conforming to EN 10216-2 standard. Through normalizing and tempering treatment (i.e., +NT state)

Product Detail

Product Tags

EN 10216-2 1.7386 X11CrMo9-1 Seamless Steel Tubes
EN 10216-2 1.7386 X11CrMo9-1 Seamless Steel Tubes for pressure purposes (power plant boiler tubes/oil refinery boiler tubes)
 
EN 10216-2 X11CrMo9-1 is an alloy seamless steel pipe material grade used in high-temperature and high-pressure environments, corresponding to DIN material number 1.7386. X11CrMo9-1 material is specifically designed for boilers, pressure vessels, and high-temperature piping systems, possessing excellent high-temperature strength, creep resistance, and oxidation corrosion resistance.
 
X11CrMo9-1+NT is a 9-12% chromium-based martensitic heat-resistant alloy steel, conforming to EN 10216-2 standard. Through normalizing and tempering treatment (i.e., +NT state), it forms a tempered martensitic structure, possessing both high strength and creep resistance. Its alloy design is based on chromium (8.0-10.0%) and molybdenum (0.90-1.10%). Through solid solution strengthening and oxidation resistance, it can be used stably for a long time in an environment of 550-600℃ and can still maintain stable mechanical properties in high-temperature environments above 600℃.
 
Standard:BS EN 10216-2:2013
Seamless steel tubes for pressure purposes — Technical delivery conditions Part 2: Non-alloy and alloy steel tubes with specified elevated temperature properties.
 
 
EN 10216-2 1.7386 X11CrMo9-1 Seamless Steel Tubes Quick Details
Manufacture:Seamless process
Wall thickness(WT): 2.1mm——20 mm.
Outer diameter (OD): 21 mm——509mm
Length: 6M or specified length as required.
Ends: Plain End, Beveled End, Treaded
 
Additional Info
Port of Shipment: Tianjin,Shanghai,Guangzhou,Any port of China
Payment Terms:T / T, LC
Delivery: 25-45 days after payment
Surface: Tubes will be varnished to prevent rust.
Marking: Standard + Steel Grade + Size + Heat No + Lot No
Package: Bundles (hexagonal),Wooden Boxes,Crates (steel/wooden) or as required
 
 
Manufacturing process
Steel making process
1.7386 X11CrMo9-1 Steels making process is defined by the manufacturer with the exception that the open hearth (Siemens-Martin) process shall not be employed unless in combination with a secondary steelmaking or ladle refining process.
1.7386 X11CrMo9-1 Steels shall be fully killed.
NOTE This excludes the use ofrimming, balanced or semi-killed steel.

The tubes shall be manufactured by a seamless process.
Unless option 1 is specified, the tubes may be either hot or cold finished. The terms “hot finished” and“cold finished” apply to the condition ofthe tube before it is heat treated
（Option 1: The tubes shall be cold finished before heattreatment.）

Heat Treatment For EN 10216-2 1.7386 X11CrMo9-1 Seamless Steel Tubes
 

Steel Grade Heat
treatment
a		 Austenizing Tempering
Steel Name Steel Number Temperature °C Cooling
Medium		 Temperature °C Cooling
medium
X11CrMo9-1+I 1.7386+I +I  950 to 980 furnace
atmosphere		    
X11CrMo9-1+NT 1.7386+NT +NT
c		 890 to 950 air 720 to 800 air
a
+N = Normalizing, +NT = Normalizing + Tempering, +QT = Quenching + Tempering (air or liquid), +I = Isothermal Annealing.
b
Normalizing includes Normalizing Forming. Normalized Forming shall be carried out in a temperature range from 880 °C to 1 000 °C.
c 
For these steel grades it may be necessary in the case of wall thickness T above 10 mm or T/D > 0,15 to apply quenching and tempering in order to achieve the intended structure and material properties. The decision shall be left to the discretion of the manufacturer but shall be stated to the customer at the time of enquiry and order. Steel tubes treated in such a way shall be designated by the steel name supplemented by the symbol “+QT “.
 
 

Chemical Composition of EN 10216-2 1.7386 X11CrMo9-1 Seamless Steel Tubes
Steel Grade Steel Number C Si Mn P max Smax
X11CrMo9-1+I
X11CrMo9-1+NT		 1.7386+I
1.7386+NT
0.08 to 0.15
0.25 to 1.00
0.30 to 0.60
 0.025  0.010
 
Cr Mo Ni Al tot Cu V
8.0 to 10.0
0.90 to 1.10
 -  ≤ 0.040 ≤ 0.30 - 
 

 
Mechanical Properties of EN 10216-2 1.7386 X11CrMo9-1 Seamless Steel Tubes
Steel Grade Upper yield strength or proof strength R eH or Rp 0,2 for Wall Thickness Tmin. Tensile
Strength
Rm		 Elongation
A min.
% a
Steel Name Steel Number T ≤ 16 16 < T ≤ 40 40 < T ≤ 60 60 < T ≤ 100 l t
MPa * MPa * MPa * MPa * MPa *
X11CrMo9-1+I 1.7386+I 210  210  210  - 460 to 640 20 18 
X11CrMo9-1+NT 1.7386+NT 390  390  390  - 590 to 740 18 16
 
Steel Grade Impact properties
Minimum average absorbed energy KV 2 J
at a temperature of °C
Steel Name Steel Number l t
20 0 -10 20 0
X11CrMo9-1+I 1.7386+I40 40 - - 27 -
X11CrMo9-1+NT 1.7386+NT 40 - - 27 -
Note:l = longitudinal t = transverse
Impact test verification (longitudinal or transversal) is mandatory for wall thickness T ≥ 16 mm.
 
 

Minimum proof strength R p0,2 at elevated temperature of EN 10216-2 1.7386 X11CrMo9-1 Seamless Steel Tubes
Steel Grade  Wall thickness
mm		 Minimum proof strength R p0,2 MPa at a temperature of °C
Steel name Steel number   100 150 200 250 300 350 400 450 500 550
X11CrMo9-1+I 1.7386+I  ≤ 60 187 186 178 177  175 171 164  153  142 120
X11CrMo9-1+NT 1.7386+NT  ≤ 60 363 348 334  330 326  322 316 311 290 235 
 Note:1 MPa = 1 N/mm 2 .
 


Dimensions tolerances of EN 10216-2
 
Tolerances on outside diameter and wall thicknes
Outside Diameter D mm Tolerances on
D		 Tolerances on T for a T/D ratio
≤ 0,025 > 0,025
≤ 0,050		 > 0,050
≤ 0,10		 > 0,10
D ≤ 219,1 ± 1% or ± 0.5mm  
whichever is the greater		 ± 12,5% or ± 0.4mm whichever is the greater
D > 219,1 ± 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
 

Tolerances on inside diameter and wall thickness
Tolerances on inside diameter Tolerances on T for a T/d ratio
d d min ≤ 0,03 > 0,03
≤ 0,06		 > 0,06
≤ 0,12		 > 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
 
 
Tolerances on outside diameter and minimum wall thickness
Outside diameter D mm Tolerances on D Tolerances on T min for a T min /D ratio
≤ 0,02 > 0,02
≤ 0,04		 > 0,04
≤ 0,09		 > 0,09
D ≤ 219,1 ± 1% or ± 0.5mm
whichever is the greater		 (+ 28%,0) or (+ 0.8 mm,0) whichever is the greater
D > 219,1 + 50%
0		 + 35%
0		 + 28%
0		 + 22% a
0
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
 
 
Tolerances on inside diameter and minimum wall thickness
Tolerances
on inside diameter		 Tolerances on T min for a
T min /d ratio
d d min ≤ 0,05 > 0,05
≤ 0,1		 > 0,1
± 1% or ± 2 mm
whichever is the greater		 (+2%,0) or (+ 4 mm,0) whichever is the greater + 35%
0		 + 28%
0		 + 22% a
0
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
 
 
Tolerances on exact lengths
Dimension in mm
Length L Tolerance on exact length
L ≤ 6000 +10
0
6000 < L ≤ 12 000 +15
0
L > 12 000 + by agreement
0
 


Straightness
The deviation from straightness of any tube length L shall not exceed 0,001 5 L. Deviations from straightness over any one metre length shall not exceed 3 mm.
 
Preparation of ends
The tubes shall be delivered with bevelled ends (see Figure 1). The bevel shall have an angle α of 30°(+5°,0°) with a root face C of 1.6 mm ± 0.8 mm, except that for wall thickness T greater than 20 mm, an agreed alternative bevel may be specified.
 
 
 

 
TESTINGS
(1)Chemical analysis
(2)Tensile test(Tensile test at room temperature, Tensile test at elevated temperature)
(3)Flattening test
(4)Ring tensile test
(5)Drift expanding test
(6)Ring expanding test
(7)Impact test
(8)Leak tightness test(Hydrostatic test,  Electromagnetic test)
(9)Dimensional inspection
(10) Visual examination
(11) Non-destructive testing
 
Note:
a The choice of flattening or ring tensile test and of drift expanding test or ring expanding test is at the manufacturer’s discretion.
b For steel grades X11CrMo9-1 tubes, the flattening or ring tensile test and the drift expanding test or ring expanding test shall be carried out at one end of 20 % of the tubes of each test unit.
c Group A: tubes having wall thickness T ≥ 16 mm manufactured from steel grades  X11CrMo9-1,
 
In the event that the purchaser does not indicate a wish to implement any of these options at the time of enquiry and order, the tubes shall be supplied in accordance with the basic specification
 
 
MARKING
Marking to be applied
The marking shall be indelibly marked on each tube at least at one end. For tubes with outside diameter D ≤ 51 mm the marking on tubes may be replaced by the marking on a label attached to the bundle or box.
 
EXAMPLE 100 m - Tube - d min 240 x T min 40 - EN 10216-2 1.7386 X11CrMo9-1
Marking can be customized according to customer requirements
 
PROTECTION
The tubes will be delivered with A temporary protective coating or durable coating and/or lining
 

Analysis of Main Application Areas and Specific Application Cases of EN 10216-2 1.7386 X11CrMo9-1+NT Seamless Steel Tubes for Pressure Use
1. Energy and Power Sector
Supercritical Boiler Tubes: In high-temperature steam environments above 600℃, EN 10216-2 1.7386 X11CrMo9-1 seamless steel tubes are used in superheaters and main steam pipelines. For example, the Niederaussem K unit in Germany uses similar 9Cr steel grades (such as P91) to achieve efficient power generation under steam conditions of 580℃/600℃.
 
Nuclear Power Equipment: Reactor pressure vessel lining material with excellent resistance to neutron radiation embrittlement, ensuring the long-term safe operation of nuclear power plants.
 
2. Petrochemical Industry
Hydrogenation Reactors: In environments with 550℃, 10 MPa high pressure, and hydrogen sulfide, EN 10216-2 1.7386 X11CrMo9-1, with its resistance to hydrogen embrittlement and sulfur corrosion, has become the core pipe material for refinery hydrogenation units.
 
Cracking Furnace Tubes: Resistant to carburization and coking during ethylene cracking, extending equipment lifespan. For example, a petrochemical company extended its maintenance cycle by 30% after using this material for its cracking furnace tubes.
 
3. High-End Manufacturing Industry
Steam Turbine Rotors and Blades: Withstand centrifugal stress and thermal fatigue under high-speed rotation. For example, a steam turbine manufacturer used X11CrMo9-1+NT to manufacture rotors, which operated stably for over 100,000 hours at 620℃.
 
High-Pressure Piping Systems: EN 10216-2 1.7386 X11CrMo9-1 seamless steel pipes are widely used in the construction of main steam pipelines in domestic and international thermal power and nuclear power projects.
 
In conclusion, X11CrMo9-1+NT, as a high-performance alloy material conforming to the European standard EN 10216-2, has become an ideal choice for high-temperature and high-pressure applications due to its precise chemical composition, excellent mechanical properties, and stringent manufacturing processes. Its reliability and durability have been proven in the market across various sectors, including energy and power, petrochemicals, and high-end manufacturing

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