Super Duplex S32750 Seamless Steel Pipe , Seamless Hydraulic Tubing High Toughness

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: 10000 feet
Price: Negotiable
Packaging Details: Level wound coiled on wooden spool, and 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 S32750 Comply With NACE MR0175/ISO15156 Tube Type: Seamless
Condition: Bright Annealed Length: Up To 10000 Meters Long Per Reel
Qualification: Hydrostatic Tested Application: Oil And Gas Fields
Surface: Metallic Bright Specialty: High-pressure Hydraulic
High Light:

annealed stainless steel tubing


stainless steel coil tubing

Product Description

Super Duplex S32750 Seamless Steel Pipe , Seamless Hydraulic Tubing



Duplex S32750 is a super duplex stainless steel designed for applications which demand exceptional strength and corrosion resistance. Alloy S32750 has 25% chromium, 4% molybdenum, and 7% nickel. This high molybdenum, chromium and nitrogen content results in excellent resistance to chloride pitting and crevice corrosion attack and the duplex structure provides 2507 with exceptional resistance to chloride stress corrosion cracking.


Usage of S32750 should be limited to applications below 600° F (316° C). Extended elevated temperature exposure can reduce both the toughness and corrosion resistance of alloy S32750.

Duplex S32750 possesses excellent mechanical properties. Often a light gauge of S32750 material can be used to achieve the same design strength of a thicker nickel alloy. The resulting savings in weight can dramatically reduce the overall cost of fabrication.



● High resistance to chloride stress corrosion cracking

● High Strength

● Superior resistance to chloride pitting and crevice corrosion

● Good general corrosion resistance

● Suggested for applications up to 600° F

● Low rate of thermal expansion

● Combination of properties given by austenitic and ferritic structure

● Good weldability and workability


Super Duplex Stainless S32750, 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





MEILONG is an important manufacturer in premium coiled seamless & welded tubular solutions for oil and gas applications. In an endeavor to increase its presence in subsea, MEILONG has extended its offer by developing a highly innovative tubular solution for umbilical projects.


MEILONG has developed a strong and unique expertise in premium quality tubes to answer the most stringent specifications of its customers. Based on this expertise in high pressure, and extremely high pressure tubes, MEILONG’s state-of-art factory is exclusively dedicated to the manufacturing and supply of super duplex and high nickel alloys tubes for corrosive downhole applications and is now ready to offer the highest specifications for your toughest challenges.



Corrosion Resistance

S32750 Duplex is highly resistant to uniform corrosion by organic acSuper Duplex S32750 Plateids such as formic and acetic acid. It is alsohighly resistant to inorganic acids, especially if they contain chlorides. Alloy S32750 is highly resistant to carbide-related intergranular corrosion. Due to the ferritic portion of the duplex structure of the alloy it is very resistant to stress corrosion cracking in warm chloride containing environments. Through additions of chromium, molybdenum and nitrogen localized corrosion such as pitting and crevice attack are improved. Alloy S32750 has excellent localized pitting resistance.



Standards and Specifications

Tubing Specification PTM-TS-011, Duplex Stainless 2507 Tubing for Control Line Applications

ASTM A789, Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Tubing for General Service

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


Capillary String Size

Imperial size Metric size









1/8 (0.125) 0.028 3.18 0.71
  0.035 3.18 0.89
3/16 (0.188) 0.028 4.76 0.71
  0.035 4.76 0.89
  0.049 4.76 1.24
1/4 (0.250) 0.035 6.35 0.89
  0.049 6.35 1.24
  0.065 6.35 1.65
  0.083 6.35 2.11
3/8 (0.375) 0.035 9.53 0.89
  0.049 9.53 1.24
  0.065 9.53 1.65
  0.083 9.53 2.11
1/2 (0.500) 0.035 12.7 0.89
  0.049 12.7 1.24
  0.065 12.7 1.65
  0.083 12.7 2.11
5/8 (0.625) 0.049 15.88 1.24
  0.065 15.88 1.65
  0.083 15.88 2.11
3/4 (0.75) 0.065 19.05 1.65
  0.083 19.05 2.11
1 0.065 25.4 1.65
  0.083 25.4 2.11


Tubing length up to 32,808 feet (10,000 m)

For control line, chemical injection line, umbilicals


Dimensional tolerances: ASTM A632 standard is used to define permissible variation in tubing wall thickness and diameter.

Variation in tubing diameter:

+0.003’’ is permissible for tubing below 0.188’’ diameter and

+0.004’’ is for tubing above 0.188’’ nominal diameter


Variation in wall thickness: For both seamless and welded tubing +10/-10% deviation is acceptable


No negative tolerance permitted on the variation on length measurement


Orbital welds: Each one reel of tubing is a continuous length without orbital butt welds


Pressure rating: The pressure rating shall be specified on the PO.


Material quality: The material shall be free of injurious seams, laps, longitudinal and transverse notches or other imperfections, which due to their nature will interfere with the use of the material I final usage of the part.


Pressure testing: Each coil of tubing shall be hydrostatically pressure tested at its maximum rated test pressure (specified in purchase order or the supplied test pressure rating table) for a minimum of 15 minutes. The test pressure of the tubing shall be reported on the certification.


Production Process

Welded & Redrawn Tubing

Strip splice welds join lengths of cold rolled strip to enable long lengths between orbital welds (greater than 14,500 ft between orbital welds is achievable). The strip is formed into a tubular cross section and longitudinally seam welded using the gas tungsten arc (GTAW) process. The tubing is first sunk to an intermediate outside diameter, heat treated, and make the same process to obtain the desired size.


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 S32750 material provides excellent corrosion resistance in chloride-containing environments.

All Super Duplex Stainless S32750 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.


Quality Assurance

Eddy current test (ECT)

Ultrasonic test

Hydrostatic test

Chemical composition analysis

Tensile test

Hardness test

Dimension & visual inspect

Metallographic analysis


Available Material Grades

Standard Grade UNS Steel No.

ASTM A213 A269








ASTM A213 A269








EN 10216-5 TC1 TP316Ti S31635 1.4571

ASTM A213 A269















ASTM A789 2507 S32750 1.4410
ASTM B423 Alloy 825 N08825 2.4858
ASTM A269 TP904L N08904 1.4539
ASTM A269 6Moly S31254 1.4547
ASTM B444 Alloy 625 N06625 2.4856
ASTM B165 Alloy 400 N04400 2.4360



Super Duplex S32750 Seamless Steel Pipe , Seamless Hydraulic Tubing High Toughness 0

Super Duplex S32750 Seamless Steel Pipe , Seamless Hydraulic Tubing High Toughness 1

Super Duplex S32750 Seamless Steel Pipe , Seamless Hydraulic Tubing High Toughness 2


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