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What is the Difference Between the ERW and the Seamless Stainless Steel Pipes?

The manufacturing methods employed in producing Electric Resistance Welding (ERW) and seamless pipes result in key differences between the two. ERW pipes are created by rolling metal and welding it longitudinally, forming a welded joint along the cross-section. On the other hand, seamless pipes are produced by extruding solid round billets, resulting in a pipe without any joints or welds along its entire length.

What are Seamless pipes? Seamless pipes are meticulously crafted to meet precise dimensional and wall thickness specifications, ranging in sizes from 1/8 inch to 26 inches OD. They find extensive applications in high-pressure industries such as hydrocarbon, refineries, oil and gas exploration and drilling, oil, and gas transportation, as well as in air and hydraulic cylinders, bearings, boilers, automobiles, and more.

What is erw pipe? ERW pipes, on the other hand, are longitudinally welded and can be manufactured up to 24 inches OD, using strips or coils of steel. Through a process involving the pulling of a steel ribbon through a series of rollers and subsequent fusion via an electric charge, ERW pipes are formed. They are predominantly used in low to medium-pressure applications, including water and oil transportation. As a reputable ERW Stainless Steel Pipes Manufacturer and exporter, Kalpataru Piping Solutions offers top ERW pipes from India. Contact us for detailed product information.

ERW Steel Pipe commonly comes in a range of sizes, from 2 3/8 inches OD to 24 inches OD, with various length options extending over 100 feet. Surface finishes are available in both bare and coated formats, and we offer on-site processing to cater to customer specifications.

What raw materials are required for the production of seamless and ERW stainless steel pipes?

Seamless Steel Pipe is crafted by heating a solid round steel ‘billet’ and then shaping it into a hollow tube through a process of pushing or pulling over a form. The procurement of billets involves sourcing from both domestic suppliers such as JSPL, JSW & Kalyani, as well as renowned mills from Europe, Far East countries, Canada, China, and other international sources.

In the production of ERW SS Pipes, HR Coils play a crucial role. These HR Coils are sourced primarily from indigenous suppliers such as SAIL, Essar, JSW, Lloyds, and other reputable providers.

The cost difference between seamless and erw pipes?

Since making seamless pipes takes longer and involves more steps than making welded pipes, seamless pipes always cost more than welded pipes. Cold-formed sheets are used to make ERW pipes, which are then joined by high-frequency welding, which is a fairly simple process that costs a fraction of what seamless pipes do.

Why use seamless pipes instead of erw pipes?

Since making seamless pipes takes longer and involves more steps than making welded pipes, seamless pipes always cost more than welded pipes. Cold-formed sheets are used to make ERW pipes, which are then joined by high-frequency welding, which is a fairly simple process that costs a fraction of what seamless pipes do.

Why choose seamless pipe for the Oil & Gas sectors?

High-pressure jobs are best done with pipes that don’t have any seams. In the oil and gas industry, the flow of media through the system puts a strong force on the pipes, especially when the temperature is high. Because of this strong force and the rise in temperature, pipes are under a lot of stress. When it comes to seamless pipes, they can handle almost 20% more pressure, which makes them perfect for the oil and gas industry.

What technologies are utilized in the manufacturing process of seamless and ERW pipes?

The production of seamless and ERW pipes involves different technologies. The “CPE” Technology is globally recognized for manufacturing seamless pipes and tubes with outer diameters (OD) up to 7 inches. It has earned a renowned reputation in the industry. For higher diameter seamless pipes ranging from 7 inches to 14 inches, the “Plug Mill” Technology is widely employed. This technology is considered the most reliable and efficient method for producing seamless pipes in the higher diameter segment.

On the other hand, high frequency Induction Welding Technology is utilized for manufacturing ERW pipes and tubes with outer diameters up to 21 inches. This advanced technology ensures precise and strong welding for the production of ERW pipes, meeting industry standards.

These different technologies cater to specific size ranges and are chosen based on their effectiveness, reliability, and efficiency in the respective diameter segments of seamless and ERW pipe production.

Electric resistance welded pipe, or ERW pipe for short can be made by rolling a sheet of steel into a cylinder while it is still cold. After the steel has been cold-formed, an electric current is run between the two edges. The electric current heats the cold-formed steel sheet to a point where the edges are forced to move in the same direction and stick together. No welding filler material is needed for the bond to form during this welding process. A high-frequency ERW process is thought to be the most commercially viable way to get the best quality weld.

Seamless pipes are made in a longer and more difficult process than welded pipes. Heat and a few other steps are used in this process to make the final product. First, the raw steel is heated and poured into blocks. The raw steel alloy is shaped into a cylinder by these solid billets. After the raw steel pipe has been formed into a cylinder, it is rolled until it is stretched and hollowed. This new product has a center that is not a perfect circle. A bullet-shaped piercer point is pushed through the center of the billet while it is being rolled. This gives the hollow a more even surface and shape.

How to Identify Stainless Steel Seamless Pipe or ERW?

To determine whether a pipe is seamless or ERW, you can easily identify it by reading the stencil on the side of the pipe. If the stencil indicates ASTM A53 and “Type S,” it means the pipe is seamless. “Type F” denotes a furnace-welded pipe, while “Type E” signifies electrical resistance welded. This simple method allows for quick identification of whether a pipe is seamless or ERW.

In summary, the marketing of seamless pipes is often based on an outdated myth that they are flawless, while welded pipes are believed to have inherent flaws throughout their length. However, it is important to recognize that each product form and manufacturing method has its own unique challenges and potential defects. As consumers, it is crucial to familiarize ourselves with these issues and understand how they might impact specific applications. By making informed decisions based on facts rather than myths, we can ensure the suitability of pipes for various purposes.

For a visual understanding of the ERW stainless steel manufacturing process, we invite you to watch our video. At Kalpataru Piping Solutions, we are a leading manufacturer and exporter of ERW stainless steel pipes from India. Our manufacturing unit, located in Rajkot, Gujarat (India), produces ERW steel pipes in various dimensions and shapes. As one of the largest stainless steel pipe exporters from India, we prioritize using the finest quality raw materials that are ISO and OHSAS certified. With our capabilities to handle large and customized orders, we cater to clients worldwide. For more information about our ERW stainless steel pipes, please feel free to contact us via Skype or email. Choose Kalpataru Piping Solutions as your trusted stainless steel pipe supplier from India.

ERW Pipe Thickness Chart and Sizes

 

DN PIPE OUT DIAMETER (OD) ERW PIPE THICKNESS CHART
A SERIES B SERIES SCH5S SCH10S SCH20S LG SCH20 SCH30 STD SCH40 SCH60 XS SCH80 SCH100 SCH120 SCH140 SCH180
324050 42.448.360.3 384557 1.61.61.6 2.82.82.8 3.23.23.6 –3.2 3.63.64.0 5.05.05.6 6.37.18.8
658090 76.188.9101.6 7689- 2.02.02.0 3.03.03.0 3.64.04.0 4.54.54.5 5.05.65.6 7.18.08.0 10.011.012.5
100125150 114.3139.7168.3 108133159 2.02.92.9 3.03.43.4 4.05.05.0 5.05.05.6 5.96.37.1 8.810.011.0 11.012.514.2 14.216.017.5
200250300 219.1273.0323.9 219273325 2.93.64.0 4.04.04.5 6.36.36.3 6.36.36.3 7.18.08.8 8.08.810.0 10.012.514.2 12.516.017.5 16.017.522.2 17.522.225.0 20.025.028.0 22.228.032.0
350400450500550600 355.6406.4457.0508.0559610 377426478529-630 4.04.04.05.05.05.6 5.05.05.05.65.66.3 8.08.08.08.08.08.0 8.08.08.010.0– 10.010.011.012.5– 10.010.010.010.010.010.0 11.012.514.216.0-17.5 16.017.520.020.0– 13.013.013.013.013.013.0 20.022.225.028.030.032.0 25.828.530.032.0– 28.030.036.040.0– 32.036.040.045.0– 36.040.045.050.0–

ASME B36.19 seamless pipe sizes

NPS(DN) ID ODIN(MM) WTIN(MM) WEIGHTLB/FT(KG/M)
1/8(6) 5S 0.405(10.3) *1
1/8(6) 10S 0.405(10.3) 0.049(1.24)*1 0.19(0.28)
1/8(6) 40S 0.405(10.3) 0.068(1.73) 0.24(0.37)
1/8(6) 80S 0.405(10.3) 0.095(2.41) 0.31(0.47)
1/4(8) 5S 0.54(13.7) *1
1/4(8) 10S 0.54(13.7) 0.065(1.65)*1 0.33(0.49)
1/4(8) 40S 0.54(13.7) 0.088(2.24) 0.43(0.63)
1/4(8) 80S 0.54(13.7) 0.119(3.02) 0.54(0.8)
3/8(10) 5S 0.675(17.1) *1
3/8(10) 10S 0.675(17.1) 0.065(1.65)*1 0.42(0.63)
3/8(10) 40S 0.675(17.1) 0.091(2.31) 0.57(0.84)
3/8(10) 80S 0.675(17.1) 0.126(3.2) 0.74(1.1)
1/2(15) 5S 0.84(21.3) 0.065(1.65)*1 0.54(0.8)
1/2(15) 10S 0.84(21.3) 0.083(2.11)*1 0.67(1.0)
1/2(15) 40S 0.84(21.3) 0.109(2.77) 0.85(1.27)
1/2(15) 80S 0.84(21.3) 0.147(3.73) 1.09(1.62)
3/4(20) 5S 1.05(26.7) 0.065(1.65)*1 0.68(1.02)
3/4(20) 10S 1.05(26.7) 0.083(2.11)*1 0.86(1.28)
3/4(20) 40S 1.05(26.7) 0.113(2.87) 1.13(1.69)
3/4(20) 80S 1.05(26.7) 0.154(3.91) 1.48(2.2)
1(25) 5S 1.315(33.4) 0.065(1.65)*1 0.87(1.29)
1(25) 10S 1.315(33.4) 0.109(2.77)*1 1.41(2.09)
1(25) 40S 1.315(33.4) 0.133(3.38) 1.68(2.5)
1(25) 80S 1.315(33.4) 0.179(4.55) 2.17(3.24)
1¼(32) 5S 1.66(42.2) 0.065(1.65)*1 1.11(1.65)
1¼(32) 10S 1.66(42.2) 0.109(2.77)*1 1.81(2.69)
1¼(32) 40S 1.66(42.2) 0.14(3.56) 2.27(3.39)
1¼(32) 80S 1.66(42.2) 0.191(4.85) 3.0(4.47)
1½(40) 5S 1.9(48.3) 0.065(1.65)*1 1.28(1.9)
1½(40) 10S 1.9(48.3) 0.109(2.77)*1 2.09(3.11)
1½(40) 40S 1.9(48.3) 0.145(3.68) 2.72(4.05)
1½(40) 80S 1.9(48.3) 0.2(5.08) 3.63(5.41)
2(50) 5S 2.375(60.3) 0.065(1.65)*1 1.61(2.39)
2(50) 10S 2.375(60.3) 0.109(2.77)*1 2.64(3.93)
2(50) 40S 2.375(60.3) 0.154(3.91) 3.66(5.44)
2(50) 80S 2.375(60.3) 0.218(5.54) 5.03(7.48)
2½(65) 5S 2.875(73) 0.083(2.11)*1 2.48(3.69)
2½(65) 10S 2.875(73) 0.12(3.05)*1 3.53(5.26)
2½(65) 40S 2.875(73) 0.203(5.16) 5.8(8.63)
2½(65) 80S 2.875(73) 0.276(7.01) 7.67(11.41)
3(80) 5S 3.5(88.9) 0.083(2.11)*1 3.03(4.52)
3(80) 10S 3.5(88.9) 0.12(3.05)*1 4.34(6.46)
3(80) 40S 3.5(88.9) 0.216(5.49) 7.58(11.29)
3(80) 80S 3.5(88.9) 0.3(7.62) 10.26(15.27)
3½(90) 5S 4.0(101.6) 0.083(2.11)*1 3.48(5.18)
3½(90) 10S 4.0(101.6) 0.12(3.05)*1 4.98(7.41)
3½(90) 40S 4.0(101.6) 0.226(5.74) 9.12(13.57)
3½(90) 80S 4.0(101.6) 0.318(8.08) 12.52(18.64)
4(100) 5S 4.5(114.3) 0.083(2.11)*1 3.92(5.84)
4(100) 10S 4.5(114.3) 0.12(3.05)*1 5.62(8.37)
4(100) 40S 4.5(114.3) 0.237(6.02) 10.8(16.08)
4(100) 80S 4.5(114.3) 0.337(8.56) 15.0(22.32)
5(125) 5S 5.563(141.3) 0.109(2.77)*1 6.36(9.46)
5(125) 10S 5.563(141.3) 0.134(3.4)*1 7.78(11.56)
5(125) 40S 5.563(141.3) 0.258(6.55) 14.63(21.77)
5(125) 80S 5.563(141.3) 0.375(9.53) 20.8(30.97)
6(150) 5S 6.625(168.3) 0.109(2.77)*1 7.59(11.31)
6(150) 10S 6.625(168.3) 0.134(3.4)*1 9.3(13.83)
6(150) 40S 6.625(168.3) 0.28(7.11) 18.99(28.26)
6(150) 80S 6.625(168.3) 0.432(10.97) 28.6(42.56)
8(200) 5S 8.625(219.1) 0.109(2.77)*1 9.92(14.78)
8(200) 10S 8.625(219.1) 0.148(3.76)*1 13.41(19.97)
8(200) 40S 8.625(219.1) 0.322(8.18) 28.58(42.55)
8(200) 80S 8.625(219.1) 0.5(12.7) 43.43(64.64)
10(250) 5S 10.75(273) 0.134(3.4)*1 15.21(22.61)
10(250) 10S 10.75(273) 0.165(4.19)*1 18.67(27.78)
10(250) 40S 10.75(273) 0.365(9.27) 40.52(60.29)
10(250) 80S 10.75(273) 0.5(12.7)*2 54.79(81.53)
12(300) 5S 12.75(323.8) 0.156(3.96)*1 21.0(31.24)
12(300) 10S 12.75(323.8) 0.18(4.57)*1 24.19(35.98)
12(300) 40S 12.75(323.8) 0.375(9.53)*2 49.61(73.86)
12(300) 80S 12.75(323.8) 0.5(12.7)*2 65.48(97.44)
14(350) 5S 14.0(355.6) 0.156(3.96)*1 23.09(34.34)
14(350) 10S 14.0(355.6) 0.188(4.78)Notes(1),(2) 27.76(41.36)
14(350) 40S 14.0(355.6) 0.375(9.53)*2 54.62(81.33)
14(350) 80S 14.0(355.6) 0.5(12.7)*2 72.16(107.4)
16(400) 5S 16.0(406.4) 0.165(4.19)*1 27.93(41.56)
16(400) 10S 16.0(406.4) 0.188(4.78)Notes(1),(2) 31.78(47.34)
16(400) 40S 16.0(406.4) 0.375(9.53)*2 62.64(93.27)
16(400) 80S 16.0(406.4) 0.5(12.7)*2 82.85(123.31)
18(450) 5S 18.0(457) 0.165(4.19)*1 31.46(46.79)
18(450) 10S 18.0(457) 0.188(4.78)Notes(1),(2) 35.8(53.31)
18(450) 40S 18.0(457) 0.375(9.53)*2 70.65(…)
18(450) 80S 18.0(457) 0.5(12.7)*2 93.54(…)
20(500) 5S 20.0(508) 0.188(4.78)*1 39.82(59.32)
20(500) 10S 20.0(508) 0.218(5.54)Notes(1),(2) 46.1(68.65)
20(500) 40S 20.0(508) 0.375(9.53)*2 78.67(117.15)
20(500) 80S 20.0(508) 0.5(12.7)*2 104.23(155.13)
22(550) 5S 22.0(559) 0.188(4.78)*1 43.84(65.33)
22(550) 10S 22.0(559) 0.218(5.54)Notes(1),(2) 50.76(75.62)
22(550) 40S 22.0(559)
22(550) 80S 22.0(559)
24(600) 5S 24.0(610) 0.218(5.54)*1 55.42(82.58)
24(600) 10S 24.0(610) 0.25(6.35)*1 63.47(94.53)
24(600) 40S 24.0(610) 0.375(9.53)*2 94.71(141.12)
24(600) 80S 24.0(610) 0.5(12.7)*2 125.61(187.07)
30(750) 5S 30.0(762) 0.25(6.35)*1 79.51(118.34)
30(750) 10S 30.0(762) 0.312(7.92)*1 99.02(147.29)
30(750) 40S 30.0(762)
30(750) 80S 30.0(762)

Note

According to ASME B1.20.1, you cannot thread these wall thicknesses.

ASME B36.10M does not agree with these sizes.

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