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Astm A790 / A789 UNS S31803 Duplex Pipe Tube

Original price was: $5,000.00.Current price is: $4,850.00.

ASTM A790 / A789 Uns S31803 duplex pipe tube is a duplex stainless steel tube with good chloride stress resistance, ASTM A790 Uns s31803 contains 21% Chrome 4.5% nickel and 2.5% molybdenum.Kcm Special Steel will supply excellent ASTM A789 UNS S31803 duplex tube and pipe with seamless and welded types.

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Description

Description

ASTM A789 / ASTM A790 UNS S31803 DUPLEX PIPE TUBE BRIEF INTRODUCTION

ASTM A790 Uns s31803 / ASTM A789 Uns S31803 duplex pipe tube is a stainless steel tube with good chloride stress resistance, Uns s31803 contains 21% Chrome 4.5% nickel and 2.5% molybdenum.

ASTM A789 / ASTM A790 Uns S31803 duplex pipe tube is duplex stainless steel pipe and a medium alloy duplex stainless steel with good chloride stress resistance. Medium alloy type – the representative grade is UNS S31803 (22Cr-5Ni-3Mo-0.15N); S31803 duplex steel pipe is in three kinds of dual phase steel (2205 duplex stainless steel pipe, 2507 duplex stainless steel pipe, S31803 duplex stainless steel seamless tube) is the most widely used.

Name ASTM A789 / ASTM A790 UNS S31803 Duplex pipe tube     Material: Duplex Stainless steel

Properties: Good chloride resistance stress Representative   grade: UNS S31803 / UNS S32205 / SAF 2205

Brand: KCM Special Steel

ASTM A790 UNS S31803 Is Standard for Seamless and Welded Ferritic-Austenitic Stainless Steel Pipe

ASTM A790 UNS S31803 Pipe Scope of application

1.1 This specification2 covers seamless and straight-seam welded ferritic/austenitic steel pipe intended for general corrosive service, with particular emphasis on resistance to stress corrosion cracking. These steels are susceptible to embrittlement if used for prolonged periods at elevated temperatures.

1.2 Optional supplementary requirements are provided for pipe when a greater degree of testing is desired. These supplementary requirements call for additional tests to be made and, when desired, one or more of these may be specified in the order.

1.3 Appendix X1 of this specification lists the dimensions of welded and seamless stainless steel pipe as shown in ANSI B36.19. Pipe having other dimensions may be furnished provided such pipe complies with all other requirements of this specification.

1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. The inch-pound units shall apply unless the M designation of this specification is specified in the order.

NOTE 1: The dimensionless designator NPS (nominal pipe size) has been substituted in this standard for such traditional terms as nominal diameter, size, and nominal size.

What Is ASTM A790 UNS S31803 Pipe?

ASTM A790 UNS S31803 Pipe & tube is a duplex stainless steel. 22% chromium duplex ( austenitic/ferritic ) steel ( type 2205 / UNS S32205 ) with moderate to high strength and good resistance to common corrosion/stress, corrosion/cracking.

The alloy of ASTM A790 UNS S31803 Pipe & tube is resistant to chloride environments and sulfide stress corrosion and is approximately twice as strong as standard austenitic stainless steels. This alloy can be successfully used as a replacement for 300 series austenitic stainless steels when higher mechanical strength/lower weight is required. The F51 is easy to weld with many standard arc welding equipment, but is not recommended for oxy-ethylene block welding due to the potential for carburization of the weld metal.

ASTM A789 / ASTM A790 UNS S31803 Pipe & tube Executive Standard

ASTM A789 / ASTM A790 UNS S31803 Chemical Composition:

‌Element‌‌Content Range (wt%)‌
Carbon (C)≤ 0.030
Silicon (Si)≤ 1.00
Manganese (Mn)≤ 2.00
Phosphorus (P)≤ 0.030
Sulfur (S)≤ 0.020
Chromium (Cr)21.00–23.00
Nickel (Ni)4.50–6.50
Molybdenum (Mo)2.50–3.50
Nitrogen (N)0.08–0.20
Copper (Cu)≤ 0.50
Iron (Fe)Balance

ASTM A789 / ASTM A790 UNS S31803 Physical Properties:

‌Property‌‌Value Range‌
Tensile Strength760–1000 MPa
Yield Strength550–750 MPa
Elongation (at Break)≥25%
Hardness (Brinell)≤290 HB

ASTM A789 / ASTM A790 UNS S31803  Heat treatment: heat preservation between 1020-1100 ℃ for 1-2 hours, rapid air cooling or water cooling.

‌Process‌‌Temperature Range‌‌Cooling Method‌‌Key Notes‌
‌Solution Annealing‌1020–1100°CRapid cooling (e.g., water)Essential to avoid prolonged exposure to brittle temperature ranges (475°C) ‌
‌Post-Weld Heat Treatment‌Generally not required—Preheating and post-weld heat treatment are unnecessary for most applications ‌

ASTM A789 / ASTM A790 UNS S31803 Pipe & tube Mechanical properties:

‌Property‌‌Value Range‌
‌Tensile Strength‌620–1000 MPa ‌
‌Yield Strength (0.2% offset)‌450–750 MPa ‌
‌Elongation (at Break)‌≥25% ‌
‌Hardness (Brinell)‌≤290 HB
‌Impact Energy (Charpy V-notch)‌≥100 J (at 20°C) ‌

ASTM A790 UNS S31803 PIPE & TUBE (UNS S31803 stainless steel pipe) is an ultra-low carbon duplex stainless acid-resistant steel with excellent resistance to pitting and crevice corrosion. At the same time, nitrogen is a strong element that forms and stabilizes austenite. Even if it is welded or heated at high temperature, it can ensure that a certain amount of austenite exists in the structure. Single-phase ferrite. The two-phase ratio is not sensitive to changes in heating temperature.

ASTM A789 Is Standard for Seamless and Welded Ferritic / Austenitic Stainless Steel Tubing

Scope of application

1.1 This specification2 covers grades of average wall thickness, or, if specified on the order, minimum wall thickness, of stainless steel tubing for services requiring general corrosion resistance, with particular emphasis on resistance to stress corrosion cracking. These steels are susceptible to embrittlement if used for prolonged periods at elevated temperatures.

1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. Within the text, the SI units are shown in brackets. The inch-pound units shall apply unless the M designation of this specification is specified in the order.

Thickness Chart Of ASTM A789 / ASTM A790 UNS S31803 Pipes

NPSOutside DiameterWall ThicknessWeightWeight
inmminmmSchedkg/MtrLb/ft
1/2″0.840210.1092.76940 STD1.2680.851
0.1473.73480 STD1.6211.088
3/4″1.050270.1132.87040 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″1.660420.1403.55640 STD3.3852.273
0.1914.85180 STD4.4642.997
1 1/2″1.900480.1453.68340 STD4.0482.718
0.2005.08080 STD5.4093.361
2″2.375600.1543.91240 STD5.4413.653
0.2185.53780 STD7.4805.022
2 1/2″2.875730.2035.51640 STD8.6295.793
0.2767.01080 STD11.4117.661
3″3.500890.2165.48640 STD11.2847.576
0.3007.62080 STD15.27210.253
4″4.5001140.2376.02016.07310.790
0.3378.56022.31814.983
6″6.6251680.1884.77519.25212.924
0.2035.51620.73913.923
0.2195.56322.31814.983
0.2506.35025.35417.021
0.2807.11240 STD58.26318.974
0.3127.92531.33421.036
0.3759.52537.28525.031
0.43210.97380 XHY42.56128.573
0.50012.70048.71932.708
8″8.6252190.1884.77525.23316.940
0.2035.15627.19818.259
0.2195.56329.28619.661
0.2506.3502033.30822.361
0.2777.0363036.78624.696
0.3228.1794042.35228.554
0.3759.52549.21633.041
0.40610.3126053.08535.638
0.50012.70080 XHY64.62743.388
10″10.7502730.1884.77531.58821.207
0.2195.56336.68924.631
0.2506.3502041.75928.035
0.3077.7983051.00234.240
0.3448.73856.94638.231
0.3659.27140 STD63.30140.483
0.43811.12571.85248.238
0.50012.70060 XHY81.53054.735
0.59415.0888095.96964.429
12″12.7503240.1884.77537.57025.222
0.2195.56343.65729.309
0.2506.35049.71333.375
0.2817.13755.73937.420
0.3127.92561.73541.445
0.3759.52573.82449.562
0.40610.31279.72753.525
0.50012.70097.43865.415
0.56214.275108.96673.154
14″14.0003560.1884.77541.30827.732
0.2195.56348.01232.233
0.2506.3502054.68536.713
0.2817.13761.32741.172
0.3127.92567.93945.611
0.3759.525STD81.28154.568
0.43811.1254094.49863.441
0.50012.700XHY107.38172.090
0.62515.875132.98389.278
16”16.0004060.1884.77547.29021.748
0.2195.56354.98036.910
0.2506.3501062.63942.053
0.2817.13770.26847.174
0.3127.9252077.86652.275
0.3448.73885.67757.519
0.3759.52530

STD

93.21362.578
0.43811.125108.43372.797
0.50012.70040

XHY

123.28982.770
18″18.0004570.2195.56361.94841.588
0.2506.35070.59347.393
0.2817.13779.20853.176
0.3127.9252087.79258.939
0.3759.525STD105.14470.588
0.43811.12530122.36982.152
0.50012.700XHY139.19893.450
0.56214.27540155.904104.666
0.62515.875172.754115.978
20″20.0005080.2506.35078.54752.733
0.2827.16388.45859.386
0.3127.92597.71965.604
0.3759.52520 STD117.07578.598
0.43811.125136.30591.508
0.50012.70030 XHY155.106104.130
0.59415.08840183.378123.110
0.62515.875192.640129.328
0.68817.475211.368141.901
24″24.0006100.2506.35094.45663.413
0.2817.137106.02971.183
0.3127.925117.57318.932
0.3759.52520 STD140.93864.618
0.43811.125164.176110.219
0.50012.700XHY186.923125.490
0.62515.875232.410156.028
0.68817.47540255.148171.293
0.75019.050277.401186.233
30″30.0007620.2506.350118.31879.433
0.2817.137132.85189.189
0.3127.92510147.35398.925
0.3759.525STD176.731118.648
0.43811.125205.983138.286
0.50012.70020 XHY234.647157.530
0.62515.87530292.066196.078
0.68817.475320.817215.380
0.75019.050348.988234.293
36″36.0009140.2506.350142.18095.453
0.2817.137159.672107.196
0.3127.92510177.133118.918
0.3759.525STD215.525142.678
0.43811.125247.790166.353
0.50012.70020 XHY282.372198.570
0.62515.875351.723236.128
0.68817.475386.487259.467
0.75019.050420.576282.353
42″42.00010670.3127.925206.914138.911
0.3759.525STD248.319166.708
0.50012.700XHY33.097221.610
0.75019.050492.163330.413
48″48.00012190.3759.525STD284.112190.738
0.43811.125331.404222.487
0.50012.700XHY377.822253.650
0.75019.050563.750378.473
0.87522.225655.969440.383

ASTM A789 / ASTM A790 UNS S31803 Pipe duplex Stainless Steel products scope

‌Product Type‌‌Standard‌‌Manufacturing Process‌‌Key Applications‌‌Properties & Advantages‌
‌Seamless Pipe/Tube‌ASTM A790/A789, ASME SA-790/SA-789‌Hot extrusion, cold drawingOffshore pipelines, high-pressure oil/gas systems, geothermal energy systems‌Superior strength (620–1000 MPa tensile), resistance to chloride stress corrosion‌
‌Welded Pipe/Tube‌ASTM A790‌, ASME SA-790‌TIG welding, laser weldingChemical processing equipment, desalination systems, shipbuilding‌Balanced ferrite-austenite microstructure, weldability with minimal intermetallic phases‌5
‌Pipe Fittings (Elbow, Tee, Reducer,Cross, Stub end)‌ASTM A403‌, ASME B16.9‌, ASTM A815Forging or machiningPipeline connections in corrosive environments (e.g., marine, chemical plants)‌Matching corrosion resistance and mechanical strength with base pipes‌
‌Pipe Caps‌ASTM A403‌, ASME B16.9‌, ASTM A815Cold forming or machiningSealing ends of pipelines, pressure vesselsEnhanced sealing performance under cyclic loading‌
‌Flanges‌ASME B16.5‌/ASME B16.47A/ ASTM A182Forging, machiningOffshore platform piping, chemical reactor connectionsHigh fatigue resistance, compatibility with duplex piping systems‌

ASTM A789 / ASTM A790 Uns S31803 pipe tube features

PREN value >34
The corrosion resistance of the medium alloy type ASTM A789 / ASTM A790UNS S31803 is between AISI 316L and 6% Mo+N austenitic stainless steel.
Yield strength is about 2 times stronger than 18-8 austenitic stainless steel.

ASTM A789 / A790 Uns S31803 duplex pipe tube applications:

‌Application Field‌‌Specific Products/Components‌‌Key Properties Utilized‌
‌Oil & Gas Industry‌Offshore pipelines, heat exchangers, subsea equipmentHigh chloride/sulfide corrosion resistance, stress corrosion cracking (SCC) resistance ‌
‌Chemical Processing‌Pressure vessels, storage tanks, transport pipelines for corrosive chemicals (e.g., acids)Pitting resistance (PREN >34), mechanical stability in aggressive media ‌
‌Marine Engineering‌Seawater desalination systems, cooling pipes, shipbuilding componentsResistance to saltwater corrosion, high strength-to-weight ratio ‌
‌Pulp & Paper Industry‌Bleaching equipment, pulp digesters, chemical storage tanksDurability in chloride-containing environments, weldability ‌
‌Power Generation‌Heat exchangers, condensers, geothermal energy systemsThermal stability, fatigue resistance under high-temperature/pressure cycles ‌
‌Other Applications‌Food processing equipment, structural components in harsh environmentsHygienic surface, combined strength and ductility ‌

‌ASTM A789 / A790 UNS S31803 Material Advantages:‌

  • ‌Dual-phase microstructure‌ (ferrite + austenite) ensures balanced strength (620–1000 MPa tensile) and corrosion resistance‌.
  • Complies with ‌ASTM A790/A790M‌ ASTM A789/789M and ‌ASME SA-790‌, ASME SA-789 standards for seamless/welded duplex pipes in industrial use‌.
  • Superior weldability and resistance to chloride-induced stress corrosion cracking (SCC)‌
Additional information

Additional information

Weight1000 kg
Dimensions6000 × 7000 × 7000 mm
Color

Length

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