Durable Seamless 316 Stainless Steel Tubing , 316l Stainless Steel
Pipe
Description
Alloy 316L is a chromium-nickel austenitic stainless steel with an
addition of molybdenum and reduced carbon content. The addition of
molybdenum provides improved resistance to pitting and crevice
corrosion in environments containing halides such as chlorides when
compared to so-called conventional 18 chromium 8 nickel austenitic
stainless steels such as 304L. The reduced carbon content minimizes
harmful chromium carbide precipitation during welding and thereby
improves resistance to intergranular corrosion. Austenitic
stainless steels such as 316L are susceptible to stress corrosion
cracking (SCC) in environments containing chlorides and other
halides. Alloy 316L is generally used in oil and gas production
environments which do not contain oxygen and have limited amounts
of chlorides and hydrogen sulfide. Consult ISO 15156-3, Table A.2
for the limits regarding alloy 316L in hydrogen sulfide-containing
environments for oil and gas production.
Corrosion Resistance
● Organic acids at high concentrations and moderate temperatures
● Inorganic acids, e.g. phosphoric and sulphuric acids, at moderate
concentrations and temperatures. The steel can also be used in
sulphuric acid of concentrations above 90% at low temperature.
● Salt solutions, e.g. sulphates, sulphides and sulphites
● Caustic environments
Austenitic steels are susceptible to stress corrosion cracking.
This may occur at temperatures above about 60°C (140°F) if the
steel is subjected to tensile stresses and at the same time comes
into contact with certain solutions, particularly those containing
chlorides. Such service conditions should therefore be avoided.
Conditions when plants are shut down must also be considered, as
the condensates which are then formed can develop conditions that
lead to both stress corrosion cracking and pitting.
TP316L has a low carbon content and therefore better resistance to
intergranular corrosion than steels of type TP316.
Standards and Specifications
ASTM A269, Standard Specification for Seamless and Welded
Austenitic Stainless Steel Tubing for General Service
Meets the material limits for 316L austenitic stainless steel
listed in ISO 15156-3, Table A.2
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: Hydrostatic Eddy Current Surface Roughness Dimensional Analysis
| Destructive Tests: Yield Strength Tensile Strength Elongation 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
Type 316L, Chemical composition
| Element | Composition, % |
| Chromium | 16.0-18.0 |
| Nickel | 10.0-14.0 |
| Molybdenum | 2.0-3.0 |
| Manganese | 2.00 max. |
| Silicon | 1.00 max. |
| Carbon | 0.035 max. |
| Sulfur | 0.030 max. |
| Phosphorous | 0.045 max. |
Application: Standard oil and gas CRA (corrosion resistant alloy)
Tensile strength, min.: 70ksi (485MPa)
Yield strength, min.: 25ksi (170MPa)
Elongation in 2 in., min.: 35%
Production Process
- 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
| Standard | TDR | Steel Grade |
| ASME | | |
| 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.
Reduce contamination with smart surface
Effective sealing with ferrules
Maintain high cleanness
Efficient work planning & material control
Effective sealing at connections
Reduce contamination-risks in the system
- 100% eddy-current and hydrostatic tested
Secure high & consistent quality
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
Applications
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 | |
