Stainless Steel Pipes
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Description:
Seamless cold drawn stainless steel pipes are made in accordance to ASTM A312 TP316 / 316L standards. The material of stainless steel pipe is available in dual grade which is SS316 / 316L which allows dual usage of tubes. SS316 pipes are most supplied in high performance fluids application for its great corrosion resistance and for its ability to withstand higher pressure. Stainless steel pipe is available in one finishing, namely annealed and pickled. The unit used in stainless steel pipes is Inch NB size range and thickness is in schedules (abbreviated as “SCH”). The unit SCH refers to the variation of thickness. There are three types of end connections for stainless steel pipes: plain end (PE), bevel end (BE), and threaded end (TE). Recommended Bend Radius: A bend radius of 3x the external tube diameter, is recommended for the tube’s cold bending using tube benders or by manual hand bending. Welding Suitability: Pipes made of TP316 and TP316L are suitable for arc welding using usual techniques. The welding should be selected in accordance with DIN EN 1600 and DIN EN 12072 part 1 taking into account the type of application and the welding technique. Chemical Composition: Chemical composition for ASTM A312 / ASME SA312, TP316/TP316L dual grade seamless stainless steel pipe is as per the table below. Features: |
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C |
Mn |
P |
S |
Si |
Ni |
Cr |
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Min. |
11.0 |
16.0 |
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Max. |
0.035 |
2.000 |
0.045 |
0.030 |
1.000 |
14.0 |
18.0 |
Mechanical Properties of the tubes at room temperature:
Tensile Strength Rm: Minimum 515 N/mm²
Upper Yield Point Reh: Minimum 205 N/mm²
Elongation at rupture A5: Minimum 35%
Hardness Test: 75 HRB
Tensile Strength Rm: Minimum 515 N/mm²
Upper Yield Point Reh: Minimum 205 N/mm²
Elongation at rupture A5: Minimum 35%
Hardness Test: 75 HRB
Stainless Steel Pipes Information
Stainless Steel Pipes Specification
One of the most supplied in Chuan Kok’s product range is stainless steel pipes. Stainless steel pipes are consumed in high performance fluid or gas line application. Most clients requests for seamless stainless steel pipes due to their corrosion resistance and ability to withstand pressure.
Introduction:
Chuan Kok keep stock for seamless stainless steel pipes in dual grade SS316/SS316L. The stainless steel pipes are in accordance to ASTM A312. ASTM A312 is the standard specification for seamless, welded, and heavily cold worked austenitic stainless steel pipe.
Stainless Steel Pipe Attributes:
The minimum tensile strength for stainless steel pipes is 515 N/mm² while minimum yield strength at Rp 0.2% at 205 N/mm². Stainless steel pipes contain at least 10.5% of chromium. This allows it to form an invisible chrome-oxide layer by reaction with oxygen.
SS316/316L is a chromium-nickel-molybdenum bearing austenitic stainless steel. The molybdenum content in stainless steel pipe is around 2.0% to 3.0%, while nickel content is around 11% to 14%. The nickel and molybdenum content provides great corrosion resistance in corrosive surroundings, such as salt water or chloride environments. In addition, SS316/316L material will reduce the tendency of the material to crack after welding. It also provides higher tensile strength at elevated temperature.
The meaning of “L” designation in SS316L grade is that carbon content is restricted to 0.03% where the normal carbon content in stainless steel SS316 is 0.08%. The lesser the carbon content the stainless steel has, the greater it is in weldability. And it also prevents chromium from being depleted, thus, it can still form the chrome oxide layer on the pipe surface.
Introduction:
Chuan Kok keep stock for seamless stainless steel pipes in dual grade SS316/SS316L. The stainless steel pipes are in accordance to ASTM A312. ASTM A312 is the standard specification for seamless, welded, and heavily cold worked austenitic stainless steel pipe.
Stainless Steel Pipe Attributes:
The minimum tensile strength for stainless steel pipes is 515 N/mm² while minimum yield strength at Rp 0.2% at 205 N/mm². Stainless steel pipes contain at least 10.5% of chromium. This allows it to form an invisible chrome-oxide layer by reaction with oxygen.
SS316/316L is a chromium-nickel-molybdenum bearing austenitic stainless steel. The molybdenum content in stainless steel pipe is around 2.0% to 3.0%, while nickel content is around 11% to 14%. The nickel and molybdenum content provides great corrosion resistance in corrosive surroundings, such as salt water or chloride environments. In addition, SS316/316L material will reduce the tendency of the material to crack after welding. It also provides higher tensile strength at elevated temperature.
The meaning of “L” designation in SS316L grade is that carbon content is restricted to 0.03% where the normal carbon content in stainless steel SS316 is 0.08%. The lesser the carbon content the stainless steel has, the greater it is in weldability. And it also prevents chromium from being depleted, thus, it can still form the chrome oxide layer on the pipe surface.
Annealed & Pickled Stainless Steel Pipe
Stainless Steel Pipe Finishing:
Pipes are supplied in 1 type of finishing which is Annealed and Pickled. Annealing is a heat treatment that alters the physical and chemical properties of the material. It also increases the ductility and reduces the stainless steel pipe hardness. Pickling is a metal surface treatment that contains acid to remove the impurities on the pipe surface.
Stainless Steel Pipe’s Pipe Ends:
There are 3 main types of pipe ends for stainless steel pipe, namely plain end (PE), bevel end (BE) and threaded end (TE).
Plain end (PE) pipes are pipes with unfinished ends. Generally, plain end pipes are used for small diameter pipe systems. It is also suitable for socket weld fittings and flanges.
Bevel end (BE) pipes are pipes that have a standard angle of 30° (+5°/-0°) on the pipes end surface. It also has a root face of 1.6mm (±0.8mm). However, pipes with non-standard angles can also be produced. Bevel end pipes are usually used for butt weld fittings and flanges where they can be directly welded to each other. Pictures of bevel end are illustrated in the product literature pdf file below.
Threaded end(TE) pipes are pipes with tapered groove that cuts into the ends of pipes. The tapered groove allows the pipes to be easily assembled with threaded fittings. The standard thread for tapered groove is National Pipe Thread (NPT). As NPT connections are assembled, it will reduce the possibility of leakage.
Pipes are supplied in 1 type of finishing which is Annealed and Pickled. Annealing is a heat treatment that alters the physical and chemical properties of the material. It also increases the ductility and reduces the stainless steel pipe hardness. Pickling is a metal surface treatment that contains acid to remove the impurities on the pipe surface.
Stainless Steel Pipe’s Pipe Ends:
There are 3 main types of pipe ends for stainless steel pipe, namely plain end (PE), bevel end (BE) and threaded end (TE).
Plain end (PE) pipes are pipes with unfinished ends. Generally, plain end pipes are used for small diameter pipe systems. It is also suitable for socket weld fittings and flanges.
Bevel end (BE) pipes are pipes that have a standard angle of 30° (+5°/-0°) on the pipes end surface. It also has a root face of 1.6mm (±0.8mm). However, pipes with non-standard angles can also be produced. Bevel end pipes are usually used for butt weld fittings and flanges where they can be directly welded to each other. Pictures of bevel end are illustrated in the product literature pdf file below.
Threaded end(TE) pipes are pipes with tapered groove that cuts into the ends of pipes. The tapered groove allows the pipes to be easily assembled with threaded fittings. The standard thread for tapered groove is National Pipe Thread (NPT). As NPT connections are assembled, it will reduce the possibility of leakage.
Pipe Ends |
Features |
Threaded End |
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Bevel End |
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Plain End |
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Outer Diameter and Wall Thickness Specifications:
Pipes outer diameter (OD) is in accordance with ASTM A312. The tolerance of pipe outer diameter and wall thickness are as below:
Pipes outer diameter (OD) is in accordance with ASTM A312. The tolerance of pipe outer diameter and wall thickness are as below:
Pipe Outer Diameter |
ASTM A312 Outer Diameter Tolerance |
ASTM A312 Wall Thickness Tolerance |
1/8"NB - 1-1/2"NB |
+0.4MM , -0.8MM |
+/- 12.5% |
2"NB - 4"NB |
+/- 0.8MM |
+/- 12.5% |
5"NB - 8"NB |
+1.6MM, -0.8MM |
+/- 12.5% |
From the table above, for pipes OD that range from 1/8"NB – 1 1/2"NB, the standard OD tolerance is +0.4mm, -0.8mm. For Chuan Kok’s pipe sizes 1/8"NB – 1 1/2"NB, we control the OD tolerance to be ±0.4mm. For 2"NB - 4"NB, the standard OD tolerance is ±0.8mm to which our pipes comply. For 5"NB - 8"NB pipes, the standard OD tolerance is +1.6mm, -0.8mm.
For pipe wall thickness, the specifications are +/- 12.5%. However, we regulate the wall thickness to +/- 10%.
Stainless Steel Pipe Wall Thickness:
Wall thickness of stainless steel pipe is expressed in “schedules”, abbreviated as SCH. Thickness of stainless steel pipes can be divided into several groups such as SCH10S, SCH40S, SCH80S, SCH160S and SCHXXS. These represent different kinds of thickness which depend on the pipe’s outer diameter (OD).
Application:
Stainless steel pipes are commonly applied in various industries as following:
Tubes and pipes are often difficult to distinguish at times, and some individuals confuse the terms of tube and pipe. Tubes and pipes, on the other hand, have significant variations. For tubes, the outer diameter and wall thickness of tubes are measured. To determine its operating pressure, the tube is manufactured with a close tolerance range and requires exact outer diameter and wall thickness measurements.
In contrast, pipes are identified or measured by nominal pipe size and schedule wall thickness. The American National Standard Institute (ANSI) and the Japanese Industrial Standard (JIS) are two distinct nominal pipe size measuring standards. Both Pipes and tubes have their own measuring chart for determining their outside diameter.
For more information regarding stainless steel pipes, please refer to en.wikipedia.org/wiki/Pipe_(fluid_conveyance).
For pipe wall thickness, the specifications are +/- 12.5%. However, we regulate the wall thickness to +/- 10%.
Stainless Steel Pipe Wall Thickness:
Wall thickness of stainless steel pipe is expressed in “schedules”, abbreviated as SCH. Thickness of stainless steel pipes can be divided into several groups such as SCH10S, SCH40S, SCH80S, SCH160S and SCHXXS. These represent different kinds of thickness which depend on the pipe’s outer diameter (OD).
Application:
Stainless steel pipes are commonly applied in various industries as following:
- Water supply systems
- Constructions
- Power plant
- Paper & pulp industry
- Structural pipe
- Oil and gas pipeline
- Chemical industry
- Heating and plumbing
- Fabrication industry
- Aerospace and engineering
Tubes and pipes are often difficult to distinguish at times, and some individuals confuse the terms of tube and pipe. Tubes and pipes, on the other hand, have significant variations. For tubes, the outer diameter and wall thickness of tubes are measured. To determine its operating pressure, the tube is manufactured with a close tolerance range and requires exact outer diameter and wall thickness measurements.
In contrast, pipes are identified or measured by nominal pipe size and schedule wall thickness. The American National Standard Institute (ANSI) and the Japanese Industrial Standard (JIS) are two distinct nominal pipe size measuring standards. Both Pipes and tubes have their own measuring chart for determining their outside diameter.
For more information regarding stainless steel pipes, please refer to en.wikipedia.org/wiki/Pipe_(fluid_conveyance).
Stainless Steel Pipe Dimensions and Pressure Ratings
Stainless Steel Pipes working pressures are calculated from ASME B31.1 standards, with values from AMSE B31.3.
Pipe Size NB (Inch) |
Pipe Size NB |
Outer Diameter OD(mm) |
Wall Thickness (mm) |
Schedule |
Working Pressure (Bar) |
Burst Pressure (Bar) |
1/8 |
6 |
10.3 |
1.73 |
40S |
474 |
1778 |
1/8 |
6 |
10.3 |
2.41 |
80S |
698 |
2618 |
1/4 |
8 |
13.7 |
2.24 |
40S |
460 |
1725 |
1/4 |
8 |
13.7 |
3.02 |
80S |
650 |
2438 |
3/8 |
10 |
17.1 |
1.65 |
10S |
263 |
870 |
3/8 |
10 |
17.1 |
2.31 |
40S |
371 |
1391 |
3/8 |
10 |
17.1 |
3.20 |
80S |
537 |
2014 |
1/2 |
15 |
21.3 |
2.77 |
40S |
356 |
1335 |
1/2 |
15 |
21.3 |
3.73 |
80S |
497 |
1864 |
1/2 |
15 |
21.3 |
4.75 |
160S |
659 |
2471 |
1/2 |
15 |
21.3 |
7.47 |
XXS |
1165 |
4369 |
3/4 |
20 |
26.7 |
2.87 |
40S |
289 |
1084 |
3/4 |
20 |
26.7 |
3.91 |
80S |
406 |
1523 |
3/4 |
20 |
26.7 |
5.56 |
160S |
608 |
2280 |
3/4 |
20 |
26.7 |
7.82 |
XXS |
921 |
3454 |
1 |
25 |
33.4 |
3.38 |
40S |
271 |
1016 |
1 |
25 |
33.4 |
4.55 |
80S |
375 |
1406 |
1 |
25 |
33.4 |
6.35 |
160S |
547 |
2051 |
1 |
25 |
33.4 |
9.09 |
XXS |
840 |
3150 |
1-1/4 |
32 |
42.2 |
3.56 |
40S |
223 |
836 |
1-1/4 |
32 |
42.2 |
4.85 |
80S |
311 |
1166 |
1-1/4 |
32 |
42.2 |
6.35 |
160S |
419 |
1571 |
1-1/4 |
32 |
42.2 |
9.70 |
XXS |
684 |
2565 |
1-1/2 |
40 |
48.3 |
3.68 |
40S |
200 |
750 |
1-1/2 |
40 |
48.3 |
5.08 |
80S |
282 |
1058 |
1-1/2 |
40 |
48.3 |
7.14 |
160S |
411 |
1541 |
1-1/2 |
40 |
48.3 |
10.16 |
XXS |
615 |
2306 |
2 |
50 |
60.3 |
2.77 |
10S |
118 |
443 |
2 |
50 |
60.3 |
3.91 |
40S |
169 |
634 |
2 |
50 |
60.3 |
5.54 |
80S |
244 |
915 |
2 |
50 |
60.3 |
8.74 |
160S |
402 |
1508 |
2 |
50 |
60.3 |
11.07 |
XXS |
525 |
1969 |
2-1/2 |
65 |
73.0 |
3.05 |
10S |
107 |
401 |
2-1/2 |
65 |
73.0 |
5.16 |
40S |
185 |
694 |
2-1/2 |
65 |
73.0 |
7.01 |
80S |
256 |
960 |
2-1/2 |
65 |
73.0 |
9.52 |
160S |
357 |
1339 |
3 |
80 |
88.9 |
3.05 |
10S |
87 |
326 |
3 |
80 |
88.9 |
5.49 |
40S |
160 |
600 |
4 |
100 |
114.3 |
3.05 |
10S |
68 |
255 |
4 |
100 |
114.3 |
6.02 |
40S |
136 |
510 |
Stainless Steel Pipe Temperature Ratings
Elevated Temperature Rating Factor is calculated using as per ASME B31.3. Dual Grades such as TP316/316L meet the requirements for the lower maximum carbon content of the L grades and the higher minimum yield and tensile strength of the non-L grades.
°C |
-60 |
93 |
204 |
315 |
426 |
537 |
Rating Factor |
1.00 |
1.00 |
0.96 |
0.85 |
0.79 |
0.76 |
Stainless Steel Pipes Information (so you can make the right choice)
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FREQUENTLY ASKED QUESTIONS
What is the range of size for stainless steel pipes?
The sizes available are range from 1/8” NB to 4” NB.
What are the main chemical ingredients used in stainless steel SS316 pipes?
The main chemical ingredients are Nickel and molybdenum which are used in manufacturing process of stainless steel SS316 pipes. By adding molybdenum in the producing process, it improves alloy corrosion resistance, specifically in the environment which is highly exposed to crevice corrosion in chloride based environments.
What are stainless steel pipes used for?
Stainless steel pipes are used in various industries such as water supply systems, aerospace and engineering, power plant, fabrication industry, oil and gas pipeline etc.
What is the difference between tubes and pipes?
Tubes: Tubes are usually measured in terms of their outer diameter and wall thickness. To determine its working pressure, the tube is manufactured with a close tolerance range and requires precise outer diameter and wall thickness.
Pipes: Pipes are classified according to nominal pipe size and schedule wall thickness.
Pipes: Pipes are classified according to nominal pipe size and schedule wall thickness.
What is the wall thickness of a Schedule 40 stainless steel pipe?
When determining the wall thickness of stainless steel pipes, standard schedules such as SCH10, 40, 80, 160, and XXS are commonly used. The most common usage thickness is SCH40, while the thickest wall thickness available for each size is SCHXXS, double extra strong.
What are the types of pipe end connection and its features?
Three types of pipe end connection as following:
Plain end connection: Finishing products by manufacturer, generally apply for small diameters size.
Threaded end connection: Tapered groove with threaded option like NPT, it helps to reduce possibility of leakage.
Bevel end connection: Standard angle of 30° on pipe end, apply in butt welding (weld-on) end connection.
Plain end connection: Finishing products by manufacturer, generally apply for small diameters size.
Threaded end connection: Tapered groove with threaded option like NPT, it helps to reduce possibility of leakage.
Bevel end connection: Standard angle of 30° on pipe end, apply in butt welding (weld-on) end connection.
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