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STAINLESS STEEL PIPES

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.

Size Range (Inch NB)
  • 1/8" to 4"
Thickness Range
  • SCH10S - SCHXXS
Dimension Standard
  • ASTM A312 / ASME SA312
Material
  • ​​TP316 / TP316L
Working Pressure
  • ​​As per DIN 2413 I Static Straight Pipe Specifications
Finishing
  • Annealed and Pickled
Origin
  • ​​Japan / China
Catalogue:
Stainless Steel Pipes
Vertical Divider
Literature:
Stainless Steel Pipes

Having difficulties looking for Stainless Steel Pipes? ​We can help you because we have all sizes.
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Product Information of Stainless Steel Pipes

1. Introduction:
​
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.

​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 Pipes Specification
Stainless Steel Pipes Specification

2. 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.

​3. 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.

4. Stainless Steel 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
  • ​Tapered groove with threaded option, such as NPT. It aids in reducing the risk of leaking.
Bevel End
  • ​In butt welding (weld-on) end connections, the standard angle of 30 degrees on the pipe end is used.
Plain End
  • Manufacturer-supplied finishing products are often used for small diameters.

5. Outer Diameter and Pipe Thickness Specifications:

Pipes outer diameter (OD) is in accordance with ASTM A312. The tolerance of pipe outer diameter and wall thickness are as below:
Annealed & Pickled Stainless Steel Pipes
Annealed & Pickled Stainless Steel Pipes
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%.

6. Outer Diameter and Pipe Thickness Specifications:

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).

7. 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
Stainless Steel Pipes
Stainless Steel Pipes

8. Differences between Tubes and Pipes​

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).

9. 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
​(SCH)
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

10. 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

11. Stainless Steel Pipe Information (so you can make the right choice)​
Stainless Steel Pipe Infographics

Product Catalogue in pdf:
Stainless Steel Pipes Catalogue
Stainless Steel Pipes
Product Literature in pdf:
Stainless Steel Pipe Literature
​Stainless Steel Pipe

​​To go back to Pipes & Tubes page
pipes and tubes

FAQ Of Stainless Steel Pipes

​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. ​
​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.
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