Duplex Stainless Steel Tubes

duplex stainless steel tube hero

Duplex stainless steel tubes are a type of steel that is gaining popularity in various industries due to their unique properties. These steels are known for their excellent corrosion resistance, high strength, and good weldability.

Duplex steels are classified into two types: the standard duplex (austenitic-ferritic) and the super duplex (higher alloyed austenitic-ferritic). The most common grade of duplex stainless steel tubes is A790 Duplex, which is widely used in oil and gas applications.

The properties of duplex stainless steel tubes depend on their chemical composition. They typically contain elements such as chromium, nickel, molybdenum, and nitrogen. One key advantage of duplex stainless steel tubes is their excellent resistance to stress corrosion cracking (SCC). This makes them ideal for use in harsh environments where other materials may fail.

API 6D is a specification that covers pipeline valves made from duplex stainless steel. These valves must meet certain requirements for dimensions, chemical composition, and mechanical properties.

The phase balance of duplex stainless steel tubes plays an important role in determining their properties. The minimum amount of each element required to maintain the desired phase balance varies depending on the specific grade of steel.

Common Grades of Duplex Stainless Steel Tubes

Duplex 2205

This is one of the most widely used grades of duplex stainless steel due to its excellent corrosion resistance, high strength, and good weldability. It contains 22% chromium, 5-6% nickel, 3% molybdenum, and trace amounts of other elements.

Lean Duplex

This grade has lower nickel content than other grades but still offers good corrosion resistance in many environments. It is often used in applications where weight reduction is critical.

Super Duplex

This grade has higher chromium and molybdenum content than other grades, making it highly resistant to corrosion in harsh environments such as seawater or chemical processing plants.

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Duplex Stainless Steel Tubes Specification

Size1/2″NB TO 12 “NB IN
StandardsASTM A 790 ASME SA 790
Grades(Duplex UNS S31803), UNS 2UNS S32205 (Duplex UNS S32205)
LengthSingle Random, Double Random & Cut Length
TypeSeamless / ERW / Welded / Fabricated
FormRound, Hydraulic Etc
ScheduleSCH20, SCH30, SCH40, STD, SCH80

Duplex Stainless Steel Tube Schedule Chart

3/4" IPS(1.050"O. D.)8 ” IPS(8.625"O. D.)
SCH 10, 40, 80, 160, XXHSCH 5, 10, 40, 80, 120, 160, XXH
1" IPS:(1.315′O. D.)10" IPS(10.750"O. D.)
1-1/4" IPS(1.660"O. D.)12" IPS(12.750"O. D.)
SCH 10, 40, 80, 160, XXHSCH 10, 20, 40(.375), TRUE40(.406), SCH80(.500)
1-1/2" IPS(1.900"O. D.)14" IPS(14.000"O. D.)
SCH 10, 40, 80, 160, XXHSCH10 (.188), SCH40 (.375)
SCH 10, 40, 80, 160, XXHSCH10(.188), SCH40(.375)
2 1/2" IPS(2.875"O. D.)18" IPS (18.000"O. D.)
SCH 10, 40, 80, 160, XXHSCH-40 (.375)
2" IPS(2.375"O. D.)16" IPS(16.000"O. D.)
3" IPS( 3.500"O. D.)-
SCH 5, 10, 40, 80, 160, XXH-

Weight Chart of Duplex stainless steel tube

NPSOutside DiameterWall ThicknessWeightWeight
-inmminmmSchedkg/MtrLb/ft
1/2″0.84210.1092.76940 STD1.2680.851
---0.1473.73480 STD1.6211.088
3/4″1.05270.1132.8740 STD1.6841.131
---0.1543.91280 STD2.1951.474
1″1.315330.1333.37840 STD2.5011.679
---0.1794.54780 STD3.3252.172
1 1/4″1.66420.143.55640 STD3.3852.273
---0.1914.85180 STD4.4642.997
1 1/2″1.9480.1453.68340 STD4.0482.718
---0.25.0880 STD5.4093.361
2″2.375600.1543.91240 STD5.4413.653
---0.2185.53780 STD7.485.022
2 1/2″2.875730.2035.51640 STD8.6295.793
---0.2767.0180 STD11.4117.661
3″3.5890.2165.48640 STD11.2847.576
---7.6280 STD15.27210.253
4″4.51140.2376.02-16.07310.79
---0.3378.56-22.31814.983
6″6.6251680.1884.775-19.25212.924
---0.2035.516-20.73913.923
---0.2195.563-22.31814.983
---0.256.35-25.35417.021
---0.287.11240 STD58.26318.974
---0.3127.925-31.33421.036
---0.3759.525-37.28525.031
---0.43210.97380 XHY42.56128.573
---0.512.7-48.71932.708
8″8.6252190.1884.775-25.23316.94
---0.2035.156-27.19818.259
---0.2195.563-29.28619.661
---0.256.352033.30822.361
---0.2777.0363036.78624.696
---0.3228.1794042.35228.554
---0.3759.525-49.21633.041
---0.40610.3126053.08535.638
---0.512.780 XHY64.62743.388
10″10.752730.1884.775-31.58821.207
---0.2195.563-36.68924.631
---0.256.352041.75928.035
---0.3077.7983051.00234.24
---0.3448.738-56.94638.231
---0.3659.27140 STD63.30140.483
---0.43811.125-71.85248.238
---0.512.760 XHY81.5354.735
---0.59415.0888095.96964.429
12″12.753240.1884.775-37.5725.222
---0.2195.563-43.65729.309
---0.256.35-49.71333.375
---0.2817.137-55.73937.42
---0.3127.925-61.73541.445
---0.3759.525-73.82449.562
---0.40610.312-79.72753.525
---0.512.7-97.43865.415
---0.56214.275-108.96673.154
14″143560.1884.775-41.30827.732
---0.2195.563-48.01232.233
---0.256.352054.68536.713
---0.2817.137-61.32741.172
---0.3127.925-67.93945.611
---0.3759.525STD81.28154.568
---0.43811.1254094.49863.441
---0.512.7XHY107.38172.09
---0.62515.875-132.98389.278
16”164060.1884.775-47.2921.748
---0.2195.563-54.9836.91
---0.256.351062.63942.053
---0.2817.137-70.26847.174
---0.3127.9252077.86652.275
---0.3448.738-85.67757.519
---0.3759.525"30 STD"93.21362.578
---0.43811.125-108.43372.797
---0.512.7"40 XHY"123.28982.77
18″184570.2195.563-61.94841.588
---0.256.35-70.59347.393
---0.2817.137-79.20853.176
---0.3127.9252087.79258.939
---0.3759.525STD105.14470.588
---0.43811.12530122.36982.152
---0.512.7XHY139.19893.45
---0.56214.27540155.904104.666
---0.62515.875-172.754115.978
20″205080.256.35-78.54752.733
---0.2827.163-88.45859.386
---0.3127.925-97.71965.604
---0.3759.52520 STD117.07578.598
---0.43811.125-136.30591.508
---0.512.730 XHY155.106104.13
---0.59415.08840183.378123.11
---0.62515.875-192.64129.328
---0.68817.475-211.368141.901
24″246100.256.35-94.45663.413
---0.2817.137-106.02971.183
---0.3127.925-117.57318.932
---0.3759.52520 STD140.93864.618
---0.43811.125-164.176110.219
---0.512.7XHY186.923125.49
---0.62515.875-232.41156.028
---0.68817.47540255.148171.293
---0.7519.05-277.401186.233
30″307620.256.35-118.31879.433
---0.2817.137-132.85189.189
---0.3127.92510147.35398.925
---0.3759.525STD176.731118.648
---0.43811.125-205.983138.286
---0.512.720 XHY234.647157.53
---0.62515.87530292.066196.078
---0.68817.475-320.817215.38
---0.75 19.05-348.988234.293
36″369140.256.35-142.1895.453
---0.2817.137-159.672107.196
---0.3127.92510177.133118.918
---0.3759.525STD215.525142.678
---0.43811.125-247.79166.353
---0.512.720 XHY282.372198.57
---0.62515.875-351.723236.128
---0.68817.475-386.487259.467
---0.7519.05-420.576282.353
42″4210670.3127.925-206.914138.911
---0.3759.525STD248.319166.708
---0.512.7XHY33.097221.61
---0.7519.05-492.163330.413
48″4812190.3759.525STD284.112190.738
---11.12511.125-331.404222.487
---0.512.7XHY377.822253.65
---0.7519.05-563.75378.473
---0.87522.225-655.969440.383

Sizes of ASTM A928 ERW Tubes

"Pipe OD mm""Pipe WT mm"in.SchKg/m
13.721.651/410S0.5
13.722.241/440S0.64
13.723.021/480S0.81
17.151.653/810S0.64
17.152.313/840S0.86
17.153.23/880S1.12
21.342.111/210S1.02
21.342.771/240S1.29
21.343.731/280S1.65
26.672.113/410S10S
26.672.873/440S1.71
26.673.913/480S2.23
33.42.77110S2.13
33.43.38140S2.54
33.44.55180S3.29
33.46.352)11604.3
42.162.771¼10S2.73
42.163.561¼40S3.44
42.164.851¼80S4.53
42.166.352)1¼1605.69
48.262.771½10S3.16
48.263.681½40S4.11
48.265.081½80S5.49
60.332.77210S3.99
60.333.91240S5.52
60.335.54280S7.6
60.338.742)216011.29
73.033.052½10S5.35
73.035.162½40S8.77
73.037.012½80S11.59
88.93.05310S6.56
88.95.49340S11.47
88.97.62380S15.51
88.911.132)316021.67
101.63.053½10S7.53
101.65.743½40S13.78
101.68.083½80S18.92
114.33.05410S8.5
114.36.02440S16.32
114.38.56480S22.67
114.313.492)416034.05
141.36.55540S22.1
141.39.53580S31.44
141.315.882)516049.87
168.283.4610S14.04
168.287.11640S28.69
168.2810.97680S43.21
168.2814.27612054.75
168.2818.262)616068.59
219.088.18840S43.2
219.0812.7880S65.63
219.0818.23812091.3
219.0823.012)8160112.97

Duplex stainless steel tubes Pressure Rating

"Pipe O.D. (In.)"Wall Thickness Of Pipe (Inches)
-0.0280.0350.0490.0650.0830.0950.1090.12
-Working Pressure (Psig)-------
1/8790010100------
1/43700480070009500----
5/16-370054007300----
3/8-310044006100----
1/2-230032004400----
3/4--2200300040004600--
1---22002900340039004300

Industrial Application of Duplex Stainless Steel Tubes

Defence & Aerospace

Defence & Aerospace

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Oil/Gas

Oil/Gas

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Speciality Valves & Vacuum

Speciality Valves & Vacuum

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Precision Components

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FAQ

How are Duplex Stainless Steel Tubes manufactured?

Duplex Stainless Steel Tubes are typically manufactured using a variety of techniques, including hot or cold rolling, forging, and extrusion. The tubes can also be finished with various coatings and treatments to enhance their properties.

What grades of Duplex Stainless Steel are used for Tubes?

Duplex Stainless Steel Tubes are typically made from grades such as UNS S31803, UNS S32205, and UNS S32750. These grades offer a balance of strength and corrosion resistance, making them suitable for a wide range of applications.Know More

What standards are followed for Duplex Stainless Steel Tube?

Duplex Stainless Steel Tube must meet various industry standards, such as ASTM A789 and ASTM A790 for seamless and welded tubes. Other standards may also apply, depending on the specific application and industry.Know More

How do Duplex Stainless Steel Tubes compare to other types of stainless steel?

Duplex Stainless Steel Tubes offer higher strength and corrosion resistance compared to traditional austenitic stainless steel. They are also more resistant to stress corrosion cracking and have a higher resistance to pitting and crevice corrosion. However, they may be more expensive and require more care during fabrication and welding.

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