S31803 Super Duplex Stainless Steel Pipe , Annealed Stainless Steel
Tubing
Duplex Stainless S31803, 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
Standards and Specifications
Tubing Specification PTM-TS-011, Duplex Stainless S32205 Tubing for
Control Line Applications
ASTM A789, Standard Specification for Seamless and Welded
Ferritic/Austenitic Stainless Steel Tubing for General Service
Meets the material limits for duplex stainless steel with PREN 30
to 40 as listed in ISO 15156-3, Table A.24
Application
Duplex Stainless S31803 seamless 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.
A value offer for your umbilical tube challenges
The offshore industry is facing new challenges with tougher
operating conditions that are significantly impacting the
performance of the umbilical. Subsea umbilical systems for deep and
ultra-deep offshore projects are more and more demanding regarding
injection capacities, number of functionalities, power requirements
and increased tie-back lengths.
- MEILONG umbilical tubes have been designed to increase the
reliability and performances of your umbilical systems while
ensuring the safety, flexibility and cost-effectiveness of your
projects.
- Yours operations are safe and reliable at higher temperatures and
pressure levels, with superior benefits.
- MEILONG tubes for umbilicals open new perspectives and capabilities
for ultra-deep water projects.
Quality Assurance
Non Destructive Tests: Hydrostatic Eddy Current Surface Roughness Dimensional Analysis
| Destructive Tests: Yield Strength Tensile Strength Elongation Positive Material Identification (PMI) Grain Size Rockwell Hardness |
MEILONG has been supplying the world’s best coiled tubes up to
3,234 lbs (1,467 kgs) and 14,764 ft (4500 mtrs) length without
orbital butt welding.
Bright annealing treated, our coiled tubes are excellent in both
internal and external surface quality.
Our coiled tubes are specially used in oil and gas industry
requiring a higher level of reliability.
All the products are performed and delivered after ECT as well as
hydrostatic & ovality test satisfying ASTM standards.
Available size and alloy materials
| Materials | Imperial Size | Metric Size |
OD (in.) | WT (in.) | OD (mm) | WT (mm) |
SS316L Duplex 2205 Super Duplex 2507 Incoloy 825 Inconel 625 | 1/8 | 0.125 | 0.028 | 3.18 | 0.71 |
| 1/8 | 0.125 | 0.035 | 3.18 | 0.89 |
| 1/4 | 0.250 | 0.035 | 6.35 | 0.89 |
| 1/4 | 0.250 | 0.049 | 6.35 | 1.24 |
| 1/4 | 0.250 | 0.065 | 6.35 | 1.65 |
| 3/8 | 0.375 | 0.035 | 9.53 | 0.89 |
| 3/8 | 0.375 | 0.049 | 9.53 | 1.24 |
| 3/8 | 0.375 | 0.065 | 9.53 | 1.65 |
| 3/8 | 0.375 | 0.083 | 9.53 | 2.11 |
| 1/2 | 0.500 | 0.049 | 12.70 | 1.24 |
| 1/2 | 0.500 | 0.065 | 12.70 | 1.65 |
| 1/2 | 0.500 | 0.083 | 12.70 | 2.11 |
| 5/8 | 0.625 | 0.049 | 15.88 | 1.24 |
| 5/8 | 0.265 | 0.065 | 15.88 | 1.65 |
| 5/8 | 0.625 | 0.083 | 15.88 | 2.11 |
| 3/4 | 0.750 | 0.049 | 19.05 | 1.24 |
| 3/4 | 0.750 | 0.065 | 19.05 | 1.65 |
| 3/4 | 0.750 | 0.083 | 19.05 | 2.11 |
Duplex Stainless S31803, Characteristics and properties
Nominal Outside Diameter in. | Nominal Wall Thickness in. | Minimum Burst Pressure psi | Minimum Collapse Pressure psi |
| 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 |
Description
Duplex Stainless S31803 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 S32205 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 S32205
typically has a PRE of 36 and is considered a conventional duplex
stainless steel. Duplex Stainless S32205 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
S32205 in hydrogen sulfide containing environments for oil and gas
production.
Manufacturing Process and Resultant Properties
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.
Nondestructive Testing (NDT)
Eddy current testing (ECT) is performed on the longitudinally seam
welded tubing and strip splice welds in the as-heat treated
condition. Those strip splice welds detected by ECT. Yield pressure
hydrostatic testing is performed on the heat treated tubing at
final size.
Application
Oil and Gas: Subsea
Sub-Surface Safety Valves (SSSV) / Umbilicals: Tubes filled with
Hydraulic Fluid which run from floating platform or FPSO to the
well head on the sea floor.
Oil and Gas: Downhole
Downhole Control Lines: Tubes running from above ground surface
controls into a downhole well to the location of the well’s safety
valve.
Geothermal
Calcite Inhibition System: Carries chemicals into earth’s crust to
flash point of water in a geothermal well; injected to break down
calcite deposits and extend life of the well.
Instrumentation
Common connection tubing for control panels, pneumatic equipment,
and fluid lines.
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 long coils 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. All 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.
Meilong’s seamless control line tubing is drawn from seamless
extruded tube hollows to ensure absolute product safety and
reliability. Our seamless line tubing is one continuous length of
tubing, completely free of any welded joints or seams. Long length
coils reduce installation time and costs by eliminating the need
for excessive joints preparation and fittings. Elimination of
excessive fittings increase reliability and assures a leak-free
system. We are capable of 100% hydrotesting each coil.
In meeting customer’s requirements, our tubing can be encapsulated
in various materials such as thermalplastics, nylon and PVDF.
Coiled seamless control line tubing offers many advantages to
installers of hydraulic or pneumatic lines on offshore platforms
and onshore refineries. It offers unmatched safety and reliability,
while at the same time reducing the frequency of costly joint
connections. Close tolerance control during manufacturing assures
easy insertion and connection to fittings due to tubing’s inherent
ductility.
Downhole hole & umbilical tubing
Our long length seamless coils are used extensively for chemical
injection and hydraulic control in subsea and onshore wells. The
long length minimizes the number of orbital welds which reduces the
potential for weld-related defects and failures. Additionally, our
coils have an extremely clean and smooth ID surface that is ideal
for hydraulic and chemical injection systems. Seamless stainless
steel coils offer short hydraulic response time, greater collapse
strength, and elimination of methanol permeation.
Vacuum annealing
Meilong takes special care during manufacturing to assure ID and OD
cleanliness of control line 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.
