What are the ss seamless pipe manufacturing defects? Which testing is required to detect them?
Stainless steel seamless pipe can sometimes exhibit manufacturing defects that can affect its quality and performance. Inclusions can weaken the stainless steel pipe and make it more susceptible to corrosion or mechanical failure. Localized areas of reduced wall thickness can also occur in SS pipes during the manufacturing process.
To detect these manufacturing defects in a SS seamless pipe, a visual inspection must be done thoroughly. Ultrasonic testing can be done to identify inclusions, cracks, or wall thickness variations by analyzing the reflection and transmission of sound waves.
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What are Common Standards of SS pipe ?
- ASTM A312/ SA 312
- ASTM A213/ SA 213
- ASTM A789/ SA 789
- ASTM A790/ SA 790
- ASTM A269/ SA 269
- ASTM A270/ SA 270
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Stainless Steel Pipe Specification

- OD : 5.8 to 508mm
- Wall Thickness: 0.3 to 50mm
- Standards: ASTM A312, ASTM A269, ASME SB677, ASTM A213, ASME SA 789/ASTM A789. ASME SA 790/ASTM A790
- Manufacturing Type: Seamless
- Shape: Square, Round, Box Section, Rectangle
- Manufacturing Technology: Hot / Cold Formed
Buy PSI 30000 High pressure stainless steel seamless pipe from reliable suppliers in UAE with Test Certificates, check SS Pipe price per kg in Dubai
What is the maximum allowable working pressure for stainless steel seamless pipe? Which formula is used to calculate it?
The maximum allowable working pressure (MAWP) for high temperature stainless steel pipe depends on various factors. Factors like material grade, pipe dimensions such as diameter, and operating conditions influence the MAWP of stainless steel high pressure pipe.
The calculation of MAWP for stainless steel round pipe involves applying relevant design codes and standards specific to the industry and application. One commonly used formula to calculate the MAWP of a schedule 40 stainless steel pipe is based on the ASME Boiler and Pressure Vessel Code.
The formula for calculating the MAWP of SCH 10 stainless steel pipe is MAWP = 2 * S * t / (D – 2 * (P + 0.5 * S)).
What are most selling types of SS pipe?

Stainless Steel Seamless Pipe

High Temperature Stainless Steel Pipe

Stainless Steel High Pressure Pipe

Cold Rolled Stainless Steel Pipe

Schedule 40 Stainless Steel Pipe

Large Diameter Stainless Steel Pipe

Thick Wall Stainless Steel Pipe

Stainless Steel Round Pipe

Cold Drawn Stainless Steel Pipe
Price list of Stainless Steel Seamless Pipe
Grade 304
Nominal Bore |
Sch 10 |
Outside Diameter |
Price per Kg in USD |
Rate per Kg |
Weight |
Wt |
mm |
mm |
INCH |
USD/ Kg |
in INR |
(Kg/mt) |
mm |
6 |
13.7 |
1/4 |
6.67 |
550 |
0.39 |
1.65 |
15 |
21.3 |
1/2 |
4.85 |
400 |
0.8 |
2.11 |
10 |
17.1 |
3/8 |
5.76 |
475 |
0.49 |
2.11 |
25 |
33.4 |
1 |
4.25 |
350 |
1.3 |
2.77 |
20 |
26.7 |
3/4 |
4.85 |
400 |
1.03 |
2.11 |
32 |
42.2 |
1 1/4 |
4.25 |
350 |
1.65 |
2.77 |
65 |
73 |
2 1/2 |
4.25 |
350 |
3.69 |
3.05 |
40 |
48.3 |
1 1/2 |
4.25 |
350 |
1.91 |
2.77 |
80 |
88.9 |
3 |
4.25 |
350 |
4.51 |
3.05 |
50 |
60.3 |
2 |
4.25 |
350 |
2.4 |
2.77 |
100 |
114.3 |
4 |
4.25 |
350 |
5.84 |
3.05 |
150 |
168.3 |
6 |
4.85 |
400 |
11.32 |
3.40 |
125 |
141.3 |
5 |
4.85 |
400 |
9.47 |
2.77 |
250 |
273.1 |
10 |
4.85 |
400 |
22.63 |
3.4 |
200 |
219.1 |
8 |
4.85 |
400 |
14.79 |
2.77 |
350 |
355.6 |
14 |
6.07 |
500 |
34.36 |
3.96 |
300 |
323.9 |
12 |
5.46 |
450 |
31.25 |
3.96 |
450 |
457.2 |
18 |
6.07 |
500 |
46.8 |
4.19 |
400 |
406.4 |
16 |
6.07 |
500 |
41.56 |
4.19 |
Please note:You can speak with the accredited manufacturers and suppliers listed on this page for prices, which may vary depending on where you are..
What is the manufacturing process of SS seamless pipes?
- The manufacturing process of a cold rolled stainless steel pipe begins by procuring high-quality SS billets or ingots.
- Next, the SS billets are heated to facilitate the subsequent pipe-forming process of the cold drawn stainless steel pipe.
- The heated billet is then pierced or extruded to form a hollow tube for the stainless steel water pipe.
- The sized stainless steel threaded pipe undergoes heat treatment processes to enhance its mechanical properties.
- Various finishing operations may be performed to improve the surface finish and cleanliness of the seamless pipe.
- Stringent testing procedures are finally applied to the finished SS pipes to make sure they meet the application requirements.
Large diameter & Thick wall stainless steel pipe available in Schedule 80, 40, 60, 20, STD, XXS, suitable for chilled water systems
What does schedule mean on stainless steel pipe?
The schedule usually refers to the wall thickness of a metric stainless steel pipe. It is a numerical designation that helps standardize pipe dimensions and is commonly used in the United States.
The schedule number for a SS pipe is typically represented as Sch followed by a number, such as Sch 5, Sch 10, Sch 40, etc. A higher schedule number indicates a thick wall stainless steel pipe while a low schedule refers to a thin wall stainless steel pipe.
High temperature stainless steel pipe schedule chart
Size in Inch |
OD in Inch |
Schedule & Weight / Foot |
|
5S |
10S |
40S & STD |
80S & XH |
1/8 |
.405 |
W |
0.035 |
0.049 |
0.068 |
0.095 |
Weight |
0.1383 |
0.1863 |
0.2447 |
0.3145 |
ID |
0.335 |
0.37 |
0.269 |
0.215 |
1/4 |
.540 |
W |
0.049 |
0.065 |
0.088 |
0.119 |
Weight |
0.257 |
0.3297 |
0.4248 |
0.5341 |
ID |
0.442 |
0.41 |
0.364 |
0.0302 |
3/8 |
.675 |
W |
0.049 |
0.065 |
0.091 |
0.126 |
Weight / Foot |
0.3276 |
0.4235 |
0.5676 |
0.7388 |
ID |
0.577 |
0.545 |
0.493 |
0.423 |
1/2 |
.840 |
W |
0.065 |
0.083 |
0.109 |
0.147 |
Weight |
0.5383 |
67.1 |
0.851 |
1.088 |
ID |
0.71 |
0.674 |
0.622 |
0.546 |
3/4 |
1.050 |
W |
0.065 |
0.083 |
113 |
0.154 |
Weight |
0.6838 |
0.8572 |
1.131 |
1.474 |
ID |
0.92 |
0.884 |
0.824 |
0.742 |
1 |
1.315 |
W |
0.065 |
0.109 |
0.133 |
0.179 |
Weight |
0.8678 |
1.404 |
1.679 |
2.172 |
ID |
1.185 |
1.097 |
1.049 |
0.957 |
1-1/4 |
1.660 |
W |
0.065 |
0.109 |
0.14 |
0.191 |
Weight |
1.107 |
1.806 |
2.273 |
2.997 |
ID |
1.53 |
1.442 |
1.38 |
1.278 |
1-1/2 |
1.900 |
W |
0.065 |
0.109 |
0.145 |
0.2 |
Weight |
1.274 |
2.085 |
2.718 |
3.631 |
ID |
1.77 |
1.682 |
1.61 |
1.5 |
2 |
2.375 |
W |
.065 |
.109 |
.154 |
.218 |
Weight |
1.604 |
2.638 |
3.653 |
5.002 |
ID |
2.245 |
2.157 |
2.067 |
1.939 |
2-1/2 |
2.875 |
W |
.083 |
.120 |
.203 |
.276 |
Weight |
2.475 |
3.531 |
5.793 |
7.661 |
ID |
2.709 |
2.835 |
2.469 |
2.323 |
3 |
3.5 |
W |
.083 |
.120 |
.261 |
.300 |
Weight |
3.029 |
4.332 |
7.576 |
10.25 |
ID |
3.334 |
3.26 |
3.068 |
2.9 |
3-1/2 |
4.000 |
W |
.083 |
.120 |
.226 |
.318 |
Weight |
3.472 |
4.973 |
9.109 |
12.51 |
ID |
3.834 |
3.76 |
3.548 |
3.364 |
4 |
4.500 |
W |
.083 |
.120 |
.237 |
.337 |
Weight |
3.915 |
5.613 |
10.79 |
14.98 |
ID |
4.334 |
4.26 |
4.026 |
3.826 |
5 |
5.563 |
W |
.109 |
.134 |
.258 |
.375 |
Weight |
6.349 |
7.770 |
14.62 |
20.78 |
ID |
5.345 |
5.295 |
5.047 |
4.813 |
6 |
6.625 |
W |
.109 |
.134 |
.280 |
.432 |
Weight |
7.585 |
9.29 |
18.97 |
28.57 |
ID |
6.407 |
6.357 |
6.065 |
5.761 |
8 |
8.625 |
W |
.109 |
.148 |
.322 |
.500 |
Weight |
9.914 |
13.4 |
28.55 |
43.39 |
ID |
8.407 |
8.329 |
7.981 |
7.625 |
10 |
10.750 |
W |
.134 |
.165 |
.365 |
.500 |
Weight |
15.19 |
18.65 |
40.48 |
54.75 |
ID |
10.428 |
10.42 |
10.02 |
9.75 |
12 |
12.750 |
W |
.156 |
.180 |
.375 |
.500 |
Weight |
21.07 |
24.17 |
49.56 |
65.42 |
ID |
12.438 |
12.39 |
12 |
11.75 |
14 |
14.000 |
W |
.156 |
.188 |
.375 |
.500 |
Weight |
23.07 |
27.73 |
54.57 |
72.09 |
ID |
13.688 |
13.624 |
13.25 |
13 |
16 |
16.000 |
W |
1.65 |
.188 |
.375 |
.500 |
Weight |
27.90 |
31.75 |
62.58 |
82.77 |
ID |
15.67 |
15.624 |
15.25 |
15 |
18 |
18.000 |
W |
.165 |
.188 |
.375 |
.500 |
Weight |
31.43 |
35.76 |
70.59 |
93.45 |
ID |
17.67 |
17.624 |
17.26 |
17 |
20 |
20.000 |
W |
.188 |
.219 |
.375 |
.500 |
Weight |
39.78 |
46.27 |
78.60 |
104.1 |
ID |
19.624 |
19.682 |
19.25 |
19 |
22 |
22.000 |
W |
|
|
.375 |
.500 |
Weight |
|
|
86.61 |
114.8 |
ID |
|
|
21.25 |
21 |
24 |
24.000 |
W |
.218 |
.250 |
.375 |
.500 |
Weight |
55.37 |
63.41 |
94.62 |
125.5 |
ID |
23.564 |
23.5 |
23.25 |
23 |
26 |
26.000 |
W |
|
|
.375 |
.500 |
Weight |
|
|
102.63 |
136.17 |
ID |
|
|
25.25 |
25 |
28 |
28.000 |
W |
|
|
.375 |
|
Weight |
|
|
110.64 |
|
ID |
|
|
27.25 |
|
30 |
30.000 |
W |
.250 |
.312 |
.375 |
.500 |
Weight |
79.43 |
98.93 |
118.65 |
157.53 |
ID |
29.6 |
29.376 |
29.25 |
29 |
32 |
32.000 |
W |
|
|
.375 |
.500 |
Weight |
|
|
126.66 |
168.21 |
ID |
|
|
31.25 |
31 |
34 |
34.000 |
W |
|
|
.375 |
.500 |
Weight |
|
|
134.67 |
178.89 |
ID |
|
|
33.25 |
33 |
36 |
36.000 |
W |
|
|
.375 |
.500 |
Weight |
|
|
142.68 |
189.57 |
ID |
|
|
35.25 |
35 |
Note: W: Wall Thickness
What is SCH40 seamless stainless steel pipe maximum pressure?
Pressure rating depends upon sizes, wall thickness & temperature. For example:
- 1 inch Sch 40, wall thickness: 0.133, 100°F = Max pressure 2205 PSi
- 10 inch Sch 40, wall thickness: 0.365, 100°F = Max pressure 699 PSi
SS Pipe Manufacturing Process
12 steps of manufacturing method followed by hot rolled stainless steel seamless pipe manufacturers
- Raw material – Stainless steel round bar
- Heating process
- Piercing
- Three-roll cross rolling, extrusion or rolling
- Detached
- Sizing (or reducing)
- Cooling
- Parison tube
- Straightening
- Flaw detection or hydrostatic test
- Marking on SS seamless pipes
Size chart of Sch 10 Stainless Steel Pipe
- 1/2″ NPS 15
- 3/4″ NPS 20
- 1″ NPS 25
- 1 1/4″ NPS 32
- 1 1/2″ NPS 40
- 2″ NPS 50
- 2 1/2″ NPS 65
- 3″ NPS 80
- 3 1/2″
- 4″ NPS 100
- 5″ NPS 125
|
- 6″ NPS 150
- 8″ NPS 200
- 10″ NPS 250
- 12″ NPS 300
- 14″ NPS 350
- 16″ NPS 400
- 18″ NPS 450
- 20″ NPS 500
- 22″ NPS 550
- 24″ NPS 600
- 30″ NPS 750
|
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ASTM A312 Permitted Tolerance in Wall Thickness

Schedule 40 Stainless Steel Pipes Industrial Application
- Petroleum cracking process
- For liquid transmission pipelines
- structural and construction
- for high pressure use
- Oil and gas industries
- Mechanical use
- Casing and tubing
What are the advantages of SS pipes?
- These stainless steel pipes have excellent heat resistance properties and can sturdily withstand high temperatures without deformation.
- These stainless pipes exhibit excellent mechanical properties and can withstand high pressure, heavy loads, and harsh operating conditions.
- These pipes are widely used in food processing, pharmaceuticals, and healthcare, where maintaining sanitary conditions is crucial.
- Large diameter seamless stainless steel pipe can be recycled and repurposed without losing its quality or performance.
- Many industries employ these stainless steel smls pipes for transporting fluids, gases, and solids and for structural purposes in a wide range of applications.
A large diameter stainless steel pipe requires less maintenance and is resistant to deformation which lowers the need for frequent repairs or replacements.
How to check ends of stainless steel pipe and why it is so important?
There are a wide set of tests performed on stainless steel, making it a good choice for different applications. Hydrostatic testing is the most common test to check any leaks on a Stainless steel threaded pipe. Magnetic particle inspection is another test where a magnetic field is used to find imperfections in the metal.
Ultrasonic tests are also a viable option for testing a Large diameter seamless stainless steel pipe. This test determines the wall thickness and checks the load it can handle. The Charpy test can be employed to test its toughness. The positive material identification test helps determine its level of accuracy and strength.
The tests help in determining the strength, tolerance, and capability of the pipes to work across harsh environments.
What is the working pressure of a stainless steel round pipe?
The working pressure of a stainless steel round pipe is dependent on the material type and grade of stainless steel. Generally, the common specification of a metric stainless steel pipe can hold 7000 psi of pressure.
What is the difference between SCH 10 vs schedule 40 stainless steel pipe?
A schedule is an important parameter that measures the nominal wall thickness of a pipe. SCH 10 and 40 are two of the common pipes of stainless steel. The major difference between an SCH 10 stainless steel pipe and a schedule 40 pipe is its wall thickness and pressure holding capacity.
A pipe of schedule 10 specification has comparatively lower strength and load carrying capacity than schedule 40 stainless steel pipe. However, an SCH 10 pipe is cheaper.
How to bevel stainless steel pipe?
Beveling is a process of deburring the ends of pipes or preparing them for welding. Beveling of a Large diameter stainless steel pipe is not very complicated if you have a beveling machine. The machine creates a cut at a certain angle.
There are a variety of ways to bevel a Stainless steel water pipe. The most common ones are by using a torch or plasma cutter, a portable beveling machine, and a stationery beveling machine.
Cold rolled vs cold drawn stainless steel pipe
Cold rolled and cold drawn are both produced via the cold working process. They are differentiated based on the moulding process and processing material.
- A Cold rolled stainless steel pipe is thin and flat. Here the material is stamped using a stamping machine that rotates to give the metal a slender shape. Cold drawn stainless steel pipe is produced under high pressures. This allows the pipe to be well suited for long sections.
- A cold drawn thick wall stainless steel pipe has better strength and smooth surface finish in comparison to cold rolled pipe. The production cost of cold rolled thin wall stainless steel pipe is lower than cold drawn pipes.
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