Grain Size Oil Gas Fields Seamless Stainless Steel Tubing Corrosion Resistance

Product Details:
Place of Origin: China
Brand Name: MEILONG
Certification: ISO9001:2015, PED 97/23/EC
Model Number: 3/8'' 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: Super Duplex 2507 Comply With NACE MR0175/ISO15156 Tube Type: Seamless
Condition: Bright Annealed Length: Standard 6000mm Or 6100mm
Qualification: Air Tightness Tested Application: Oil And Gas Fields
Surface: Metallic Bright Specialty: High-pressure Hydraulic
High Light:

stainless steel seamless pipe


ss seamless pipe

Product Description

Super Duplex 2507 Stainless Instrument Tubing Corrosion Resistance Smooth Surface



Super Duplex Stainless 2507, Chemical composition

Element Composition, %
Chromium 24.0-26.0
Nickel 6.0-8.0
Molybdenum 3.0-5.0
Manganese 1.2 max.
Silicon 0.8 max.
Carbon 0.030 max.
Sulfur 0.020 max.
Phosphorous 0.035 max.
Nitrogen 0.24-0.32

Application: Super duplex alloy combining excellent strength with good corrosion resistance in high chloride and seawater environments

Tensile strength, min.: 116ksi (800MPa)

Yield strength, min.: 80ksi (550MPa)

Elongation in 2 in., min.: 15%

Hardness, max.: Brinell 310, or Rockwell C 32


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



Production Process

Seamless & Redrawn Tubing

Seamless extruded tube hollows are drawn or drawn / sunk to final size to produce seamless tubing coils 500 to 2,000 ft. long, depending upon the size. The tubing is heat treated and joined by orbital welding to achieve the desired length. The final material condition of the tubing is heat treated.


Super Duplex Stainless 2507 material provides excellent corrosion resistance in chloride-containing environments.

All Super Duplex Stainless 2507 control line tubing offered by MEILONG are made from a controlled-chemistry. Super Duplex Stainless 2507 material with minimum pitting resistance equivalent (PRE) value of 42.5

Size include 1/4’’, 3/8’’, 1/2’’, 5/8’’, 3/4’’, and 1 in. outside diameter.

Tubing nominal wall thickness meets ASTM A-789

Tube markings include size, material type/grade, specification, heat number, and other information.


  • 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  



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.

Grain Size Oil Gas Fields Seamless Stainless Steel Tubing Corrosion Resistance 0

Grain Size Oil Gas Fields Seamless Stainless Steel Tubing Corrosion Resistance 1

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