Industrial Duplex 2205 Seamless Stainless Steel Tubing High Cleanness Surface

Product Details:
Place of Origin: China
Brand Name: MEILONG
Certification: ISO9001:2015, PED 97/23/EC
Model Number: 1/4'' OD x 0.065'' WT
Payment & Shipping Terms:
Minimum Order Quantity: 500 pcs
Price: Negotiable
Packaging Details: Damp-proof protected, wooden case packing
Delivery Time: 10 days (for our required MOQ)
Payment Terms: L/C, T/T
Supply Ability: 150000 meters per month

Detail Information

Material: Duplex 2205 Comply With NACE MR0175/ISO15156 Tube Type: Seamless
Condition: Bright Annealed Length: Standard 6000mm Or 6100mm
Test: Air Tightness Tested Application: Oil And Gas Fields, Petrochemical, Hydraulic
Surface: High Cleanness Quality: Enhanced Mechanical Properties
High Light:

stainless steel seamless pipe


ss seamless pipe

Product Description

Duplex 2205 Stainless Steel High Pressure Seamless Pipe High Cleanness Surface




Duplex Stainless 2205 is a duplex stainless steel. When properly heat treated, the microstructure consists of a nearly equal mixture of the austenitic and ferrite phases. This two-phase microstructure produces a fine grain size which increases the yield strength. In the final heat treated condition, Duplex Stainless 2205 can achieve a yield strength approximately twice that of austenitic alloys such as 316L, 825 and 625 which must be cold worked to achieve comparable yield strengths. Duplex stainless steels are often classified as lean, conventional, super or hyper based upon their pitting resistance equivalent (PRE or PREN). Various PRE formulas are used to rank an alloy’s resistance to chloride pitting corrosion based upon its composition. Duplex Stainless 2205 typically has a PRE of 36 and is considered a conventional duplex stainless steel. Duplex Stainless 2205 is often selected for use in oil and gas production environments based upon its higher strength and resistance to pitting, crevice and stress corrosion cracking in chloride containing environments. Consult ISO 15156-3, Table A.24 for the limits regarding the use of Duplex Stainless 2205 in hydrogen sulfide containing environments for oil and gas production.



Duplex Stainless 2205 seam welded pressure tubing in the heat treated condition is typically used in oil and natural gas wells for chemical injection applications. In such applications, it is commonly referred to as capillary tubing and is free-hanging (self-supporting) inside the production casing. The chemicals being injected are often used to enhance production flow rates, inhibit corrosion or scaling and/or de-water. However, the tubing can also be used for control line tubing applications including hydraulically actuated surface-controlled subsurface safety valves. For control line applications, the tubing is generally deployed by strapping it to the outside of the production casing. The tubing is frequently supplied as 5,000 to 35,000 ft. coils on a wooden or steel reel, depending on size



Duplex Stainless 2205, Chemical composition

Element Composition, %
Chromium 22.0-23.0
Nickel 4.5-6.5
Molybdenum 3.0-3.5
Manganese 2.00 max.
Silicon 1.00 max.
Carbon 0.030 max.
Sulfur 0.020 max.
Phosphorous 0.030 max.
Nitrogen 0.14-0.20

Application: High mechanical strength and good resistance to localized cracking & chloride stress corrosion.

Tensile strength, min.: 90ksi (620MPa)

Yield strength, min.: 65ksi (450MPa)

Elongation in 2 in., min.: 25%

Hardness, max.: Brinell 290, or Rockwell C 30.5



Duplex Stainless 2205, Characteristics and properties

















Min. Min. Min. Min.
0.250 0.035 27,391 17,441
0.250 0.049 38,348 23,028
0.250 0.065 50,870 28,442
0.375 0.035 18,333 12,222
0.375 0.049 25,667 16,489
0.375 0.065 34,048 20,930
0.375 0.083 43,476 25,371
0.500 0.035 13,777 8,091
0.500 0.049 19,288 12,798
0.500 0.065 25,586 16,444
0.500 0.083 32,672 20,233
0.625 0.035 11,035 4,990
0.625 0.049 15,449 9,903
0.625 0.065 20,494 13,478
0.625 0.083 26,169 16,722



Since 1999, Meilong Tube Co., Ltd. has produced both long coils and straight length of stainless steel and high nickel alloy tubing for numerous oil and gas applications, including hydraulic power, monitoring and control equipment, instrumentation, injection lines, down-hole safety valve control, subsea umbilical applications. Unique manufacturing capabilities and processes allow Meilong to produce the longest continuous length control line tubing available in stainless steels and high nickel alloys.


Our coiled tubing is available in a number of high performance corrosion resistant stainless steels and high nickel alloys, including 300 series, Incoloy, Inconel, capable of withstanding a variety of severe environmental conditions.


We specialize in manufacturing small diameter tubing ranging from 0.125 inch to 1 inch outside diameter (3.18mm to 25.4 mm) and a variety of wall thickness. Besides straight length instrumentation tubing, tubing is level wound coiled on various size spools, and products are tested and evaluated for specific applications before delivery. Our engineering staff welcome the opportunity to work with customers to solve special problems.


Vacuum annealing

Meilong takes special care during manufacturing to assure ID and OD cleanliness of instrumentation tubing. Vacuum annealing insures volatility of metallic oxides and removal of any residual degreasing solvents or drawing lubricants. Vacuum annealing our stainless steel tubing insures a bright, cosmetically appealing surface as well as excellent mechanical properties.


Meilong commitment to quality excellence

From the time an order is received, sent through the production process, completed, and finally shipped, many levels of inspection occur to reinforce Meilong’s Quality Policy. The job of ensuring quality products extends as far as our machine operators. Meilong operators take ownership over material processed at their stations by measuring for dimensional accuracy and conducting a visual inspection of every piece.


Quality Assurance

Non Destructive Tests:


Eddy Current

Surface Roughness

Dimensional Analysis


Destructive Tests:

Yield Strength

Tensile Strength


Positive Material Identification (PMI)

Grain Size

Rockwell Hardness


Stainless steel tubes are delivered in straight lengths

Steel grades ensures high corrosion resistance

Special eccentricity and controlled hardness is ideal for hydraulic & instrumetation system

High surface smoothness and close dimensional tolerance, polished outside surface is the option

High inside surface cleanness

Tube be eddy current tested. Hydrostatic test is the option

The tube mill is ISO 9001, PED 97/97/23/EC approved


Corrosion Resistance

2205 duplex stainless steel is a cost effective solution for many applications where the 300 series stainless steels are susceptible to chloride stress corrosion cracking. Stress corrosion cracking occurs when stainless steels are subjected to tensile stress, while in contact with solutions containing chlorides. Increasing temperatures also increase the susceptibility of stainless steels to stress corrosion cracking.


The combination of chromium, molybdenum and nitrogen convey the good resistance of 2205 to chloride pitting and crevice corrosion. This resistance is extremely important for services such as marine environments, brackish water, bleaching operations, closed loop water systems and some food processing applications. The high chromium, molybdenum and nitrogen contents of 2205 provide corrosion resistance superior to common stainless steels, such as, 316L and 317L in most environments.



  • Order specification (in metric size mm):

6.0 x 1.0

6.0 x 1.2

6.0 x 1.5

8.0 x 1.0

8.0 x 1.2

8.0 x 1.5

10.0 x 1.0

10.0 x 1.2

10.0 x 1.5

10.0 x 2.0

12.0 x 1.0

12.0 x 1.2

12.0 x 1.5

12.0 x 2.0


  • Steel grades
Standard TDR Steel Grade
ASME SA269 304
ASME SA269 304L
ASME SA269 316
ASME SA269 316L

Other steel grades or alloy grades are available, e.g. 904L, 317, duplex 2205, alloy 400, alloy 600, alloy 800, alloy 825


Hydraulic & Instrumentation Tubes are important components in hydraulic and instrumentation systems to protect and partner with other components, devices or instruments to secure the safe and trouble-free operations of oil and gas plants, petrochemical processing, power generation and other critical industrial applications.


  • Bright annealed

Reduce contamination with smart surface


  • Controlled hardness

Effective sealing with ferrules


  • End capped

Maintain high cleanness


  • Fixed lengths

Efficient work planning & material control


  • High roundness

Effective sealing at connections


  • High cleanness

Reduce contamination-risks in the system


  • 100% eddy-current and hydrostatic tested

Secure high & consistent quality


  • 100% PMI tested

Eliminate risk & hazards


  • Controlled dimensional tolerances

Secure high performance with other components in the system


  • Dual grade & specification marked & certified

Conform to a large variety of technical requirements



Instrumentation & control lines, safety systems, sampling & analyzer lines, hydraulic systems, pneumatic lines, process impulse lines, signal transmission lines, subsea equipment, fuel & CNG lines, compressors

  • Oil and gas
  • Petrochemical
  • Automotive & rail
  • Marine & shipbuilding
  • Power generation
  • Desalination plants
  • Medical & pharmaceutical
  • Pulp & paper

Norm Equivalence

Grade UNS No Euro norm Japanese
No Name JIS
Alloy ASTM/ASME EN10216-5 EN10216-5 JIS G3463
316L S31603 1.4404, 1.4435 X2CrNiMo17-12-2 SUS316LTB
2205 S31803 1.4462 X2CrNiMoN22-5-3 SUS329J3LTB
2507 S32750 1.4410 X2CrNiMoN25-7-4  
625 N06625 2.4856 NiCr22Mo9Nb  
825 N08825 2.4858 NiCr21Mo  


Industrial Duplex 2205 Seamless Stainless Steel Tubing High Cleanness Surface 0

Industrial Duplex 2205 Seamless Stainless Steel Tubing High Cleanness Surface 1

Industrial Duplex 2205 Seamless Stainless Steel Tubing High Cleanness Surface 2

Industrial Duplex 2205 Seamless Stainless Steel Tubing High Cleanness Surface 3




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