Astm A790 / A789 UNS S31803 Duplex Pipe Tube

DescriptionASTM A789 / ASTM A790 UNS S31803 DUPLEX PIPE TUBE BRIEF INTRODUCTIONASTM 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 A790 S31803‌ Is Duplex stainless steel (austenitic-ferritic) with 22% Cr, 5% Ni, 3% Mo, and 0.15% N, offering high strength/pitting resistance for welded/seamless tubing.ASTM A789 UNS S31803‌ Is Austenitic-ferritic duplex stainless steel (22% Cr, 5% Ni, 3% Mo, 0.15% N) for seamless/welded mechanical tubing, offering superior pitting/crevice corrosion resistance in aggressive environments‌ASTM 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 steelProperties: Good chloride resistance stress Representative   grade: UNS S31803 / UNS S32205 / SAF 2205Brand: KCM Special SteelASTM A790 UNS S31803 Is Standard for Seamless and Welded Ferritic-Austenitic Stainless Steel PipeASTM A789/ASTM A790 UNS S31803 Duplex Pipe/Tube supplier and manufacturer in CHINA, contact us to get High performance SA789/SA790 UNS S31803 duplex pipe/tube for marine applications.ASTM A790 UNS S31803 Pipe Scope of application1.1 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 Duplex Pipe/Tube Supplier and manufacturer in CHINA, contact us to get high performance and reasonable price of sa789/sa790 uns s31803 duplex pipe/tube.ASTM A789 / ASTM A790 UNS S31803 Pipe & tube Executive StandardASTM A789 / ASTM A790 UNS S31803 Chemical Composition:‌Element‌‌Content Range (wt%)‌Carbon (C)≤ 0.030Silicon (Si)≤ 1.00Manganese (Mn)≤ 2.00Phosphorus (P)≤ 0.030Sulfur (S)≤ 0.020Chromium (Cr)21.00–23.00Nickel (Ni)4.50–6.50Molybdenum (Mo)2.50–3.50Nitrogen (N)0.08–0.20Copper (Cu)≤ 0.50Iron (Fe)BalanceASTM A789 / ASTM A790 UNS S31803 Physical Properties:‌Property‌‌Value Range‌Tensile Strength760–1000 MPaYield Strength550–750 MPaElongation (at Break)≥25%Hardness (Brinell)≤290 HBASTM 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 Notes‌‌Solution 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 Range‌‌Tensile Strength‌620–1000 MPa ‌‌Yield Strength (0.2% offset)‌450–750 MPa ‌‌Elongation (at Break)‌≥25% ‌‌Hardness (Brinell)‌≤290 HB‌Impact 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 TubingScope of application1.1 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 In Stock or for new production.NPSOutside DiameterWall ThicknessWeightWeightinmminmmSchedkg/MtrLb/ft1/2″0.840210.1092.76940 STD1.2680.8510.1473.73480 STD1.6211.0883/4″1.050270.1132.87040 STD1.6841.1310.1543.91280 STD2.1951.4741″1.315330.1333.37840 STD2.5011.6790.1794.54780 STD3.3252.1721 1/4″1.660420.1403.55640 STD3.3852.2730.1914.85180 STD4.4642.9971 1/2″1.900480.1453.68340 STD4.0482.7180.2005.08080 STD5.4093.3612″2.375600.1543.91240 STD5.4413.6530.2185.53780 STD7.4805.0222 1/2″2.875730.2035.51640 STD8.6295.7930.2767.01080 STD11.4117.6613″3.500890.2165.48640 STD11.2847.5760.3007.62080 STD15.27210.2534″4.5001140.2376.02016.07310.7900.3378.56022.31814.9836″6.6251680.1884.77519.25212.9240.2035.51620.73913.9230.2195.56322.31814.9830.2506.35025.35417.0210.2807.11240 STD58.26318.9740.3127.92531.33421.0360.3759.52537.28525.0310.43210.97380 XHY42.56128.5730.50012.70048.71932.7088″8.6252190.1884.77525.23316.9400.2035.15627.19818.2590.2195.56329.28619.6610.2506.3502033.30822.3610.2777.0363036.78624.6960.3228.1794042.35228.5540.3759.52549.21633.0410.40610.3126053.08535.6380.50012.70080 XHY64.62743.38810″10.7502730.1884.77531.58821.2070.2195.56336.68924.6310.2506.3502041.75928.0350.3077.7983051.00234.2400.3448.73856.94638.2310.3659.27140 STD63.30140.4830.43811.12571.85248.2380.50012.70060 XHY81.53054.7350.59415.0888095.96964.42912″12.7503240.1884.77537.57025.2220.2195.56343.65729.3090.2506.35049.71333.3750.2817.13755.73937.4200.3127.92561.73541.4450.3759.52573.82449.5620.40610.31279.72753.5250.50012.70097.43865.4150.56214.275108.96673.15414″14.0003560.1884.77541.30827.7320.2195.56348.01232.2330.2506.3502054.68536.7130.2817.13761.32741.1720.3127.92567.93945.6110.3759.525STD81.28154.5680.43811.1254094.49863.4410.50012.700XHY107.38172.0900.62515.875132.98389.27816”16.0004060.1884.77547.29021.7480.2195.56354.98036.9100.2506.3501062.63942.0530.2817.13770.26847.1740.3127.9252077.86652.2750.3448.73885.67757.5190.3759.52530STD93.21362.5780.43811.125108.43372.7970.50012.70040XHY123.28982.77018″18.0004570.2195.56361.94841.5880.2506.35070.59347.3930.2817.13779.20853.1760.3127.9252087.79258.9390.3759.525STD105.14470.5880.43811.12530122.36982.1520.50012.700XHY139.19893.4500.56214.27540155.904104.6660.62515.875172.754115.97820″20.0005080.2506.35078.54752.7330.2827.16388.45859.3860.3127.92597.71965.6040.3759.52520 STD117.07578.5980.43811.125136.30591.5080.50012.70030 XHY155.106104.1300.59415.08840183.378123.1100.62515.875192.640129.3280.68817.475211.368141.90124″24.0006100.2506.35094.45663.4130.2817.137106.02971.1830.3127.925117.57318.9320.3759.52520 STD140.93864.6180.43811.125164.176110.2190.50012.700XHY186.923125.4900.62515.875232.410156.0280.68817.47540255.148171.2930.75019.050277.401186.23330″30.0007620.2506.350118.31879.4330.2817.137132.85189.1890.3127.92510147.35398.9250.3759.525STD176.731118.6480.43811.125205.983138.2860.50012.70020 XHY234.647157.5300.62515.87530292.066196.0780.68817.475320.817215.3800.75019.050348.988234.29336″36.0009140.2506.350142.18095.4530.2817.137159.672107.1960.3127.92510177.133118.9180.3759.525STD215.525142.6780.43811.125247.790166.3530.50012.70020 XHY282.372198.5700.62515.875351.723236.1280.68817.475386.487259.4670.75019.050420.576282.35342″42.00010670.3127.925206.914138.9110.3759.525STD248.319166.7080.50012.700XHY33.097221.6100.75019.050492.163330.41348″48.00012190.3759.525STD284.112190.7380.43811.125331.404222.4870.50012.700XHY377.822253.6500.75019.050563.750378.4730.87522.225655.969440.383Large quantity stock of ASTM A789/ASTM A790 UNS S31803 Duplex Pipe/Tube, KCM Special Steel Is SA789/SA790 uns s31803 duplex pipe/tube manufacturer & supplier in CHINA, contact us for more details now!ASTM A790 / ASTM A789 UNS S31803 Pipe duplex Stainless Steel products scope‌Product Type‌‌Standard‌‌Manufacturing Process‌‌Key Applications‌‌Properties & Advantages‌‌Seamless 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 corrosion‌‌Welded Pipe/Tube‌ASTM A790‌, ASME SA-790‌TIG welding, laser weldingChemical processing equipment, desalination systems, shipbuilding‌Balanced ferrite-austenite microstructure, weldability with minimal intermetallic phases‌5‌Pipe 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 pipes‌‌Pipe Caps‌ASTM A403‌, ASME B16.9‌, ASTM A815Cold forming or machiningSealing ends of pipelines, pressure vesselsEnhanced sealing performance under cyclic loading‌‌Flanges‌ASME B16.5‌/ASME B16.47A/ ASTM A182Forging, machiningOffshore platform piping, chemical reactor connectionsHigh fatigue resistance, compatibility with duplex piping systems‌ASTM A789 / ASTM A790 Uns S31803 pipe tube featuresPREN 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 Utilized‌‌Oil & 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)‌‌ASTM A789/ASTM A790 UNS S31803 Pipe/Tube Customer Success Stories‌‌Case 1: Offshore Oil & Gas Pipeline Upgrade (Malaysia)‌‌Client‌: Petronas Carigali ‌Industry Challenge‌: Subsea pipelines in the South China Sea faced accelerated pitting corrosion (3.2 mm/year) due to high chloride concentrations (28,000 ppm) and H₂S exposure. Existing 316L pipes required bi-annual replacements, costing $1.2M/year in downtime.‌Engineered Solution‌:Supplied ‌S31803 duplex stainless steel tubes‌ (OD 324 mm, WT 12.7 mm) with ‌electropolished inner surfaces‌ (Ra ≤0.4μm, per ASTM B912).Implemented ‌argon back-purging‌ during welding to prevent sigma phase formation.Delivered ‌NACE MR0175-compliant‌ material for sour service environments.‌Measurable Outcomes‌:‌Flow Efficiency‌: 15% improvement via reduced turbulence.‌Corrosion Rate‌: Dropped to 0.05 mm/year (ISO 9223 Class C5-M).‌ROI‌: Full cost recovery within 14 months.‌Client Testimonial‌: “The duplex tubes eliminated unplanned shutdowns. We’ve standardized this solution across 18 offshore platforms.”‌Case 2: Chemical Processing Plant Expansion (Germany)‌‌Client‌: BASF SE ‌Operational Pain Point‌: 316L pipes in a nitric acid distillation unit (65% concentration, 110°C) failed catastrophically within 8 months, causing $850k in production losses.‌Technical Intervention‌:Provided ‌ASTM A790 S31803 seamless pipes‌ (Sch 80S, 219.1 mm OD) with optimized chemistry:‌Cr/Mo/N Boost‌: 23.2% Cr, 3.2% Mo, 0.18% N (exceeding ASTM A790 minima).‌Solution Annealing‌: 1040°C water quenching for 50/50 austenite-ferrite phase balance.Conducted ‌ASTM G48 Method A‌ testing: CPT = 42°C (vs. 35°C requirement).‌Performance Metrics‌:‌Service Life‌: Extended from 8 months to 5 years.‌Maintenance Costs‌: Reduced by 72% annually.‌Safety‌: Eliminated 3 critical HSE incidents/year linked to pipe bursts.‌Client Feedback‌: “These pipes handle pH 0.8 environments flawlessly. A textbook example of materials science solving industrial problems.”‌Technical Specifications Deep Dive‌‌Material Properties (ASTM A790 UNS S31803)‌ParameterValueTest Standard‌Chemical Composition‌Cr: 22.0–23.0%, Mo: 3.0–3.5%, N: 0.14–0.20%ASTM A923‌Mechanical Properties‌Tensile Strength: ‌795-930 MPa‌Yield Strength (0.2% offset): ‌550-620 MPa‌Elongation: ‌≥25%‌ (50 mm gauge length)Hardness: ‌28–32 HRC‌ (Rockwell C Scale)‌ASTM A790 UNS S31803 Pipe Corrosion Resistance‌‌Pitting Resistance Equivalent (PRE)‌:‌PRE = %Cr 3.3×%Mo 16×%N = 36.2‌‌Critical Crevice Temperature (CCT)‌: 30°C (ASTM G48 Method B)‌Stress Corrosion Cracking‌: Passed 1000h testing in boiling 45% MgCl₂ (ASTM G36)Astm A790 UNS S31803 Pipe/Tube anufacturing Tolerances‌DimensionToleranceOuter Diameter (OD)±1.0% or ±0.5mm (whichever is greater)Wall Thickness (WT) 12%/-10%Straightness≤1.5mm/m‌Service Commitments & Value-Added Solutions‌‌1. ASTM A789/ASTM A790 UNS S31803 Duplex Pipe/Tube Rapid Project Support‌‌24/7 Quote online‌: Connect with certified materials quotation within 6 hours.‌Digital Twin Service‌: Upload your piping layout (PDMS/SP3D) for clash detection and stress analysis.‌2. ASTM A789/ASTM A790 UNS S31803 Duplex Pipe/Tube Certified Supply Chain‌‌Material Traceability‌: Full EN 10204 3.2 certification with heat-specific PMI reports.‌Third-Party Validation‌: Optional DNV GL/TÜV SÜD mill audits and product certification.‌3.ASTM A789/ASTM A790 UNS S31803 Pipe/tube Advanced Processing‌‌ASTM A789/ASTM A790 Pipe/Tube Custom Fabrication‌:Orbital TIG welding with 100% X-ray inspection (ASME B31.3).Cold finished seamless with 100% quality compliance Standards of astm a790/ astm a789U-bend tubes with 3D radius (1.5×OD to 5×OD) for heat exchangers.ASTM A789/ASTM A790 Pipe/Tube Surface Treatments‌:Electropolishing (Ra ≤0.4μm)Solution Pickling very cleanBead blasting (AA 120-grit finish)‌4. Global Logistics Network‌‌Stock Availability‌: 5,000 metric tons in stock for clients’ urgent applications.‌Shipping Guarantee‌:EXW,FOB,CFR, CIF delivery to site within 45 days for orders >20 tons.Real-time container tracking via blockchain-enabled platform.‌Why Partner With Us?‌✅ ‌Unmatched Expertise‌: 17 years specializing in duplex stainless steel systems – referenced in NACE SP0108-2023. ✅ ‌Sustainability Leadership‌:100% Quality compliance with clients’ reques (ISO certified ).Exllence quality and material grade.12 monthes guaranteed return and exchange.Fast delivery and globally reach.No MOQ request, clients’ satisfaction is our goal.‌ASTM A789/ ASTM A790 UNS S31803 Duplex Pipe/Tube FAQ‌‌Q1: What makes ASTM A790 UNS S31803 duplex pipes superior to 316L/317L for offshore applications?‌‌A:‌ Our ‌ASTM A790 S31803 duplex pipes‌ provide:‌45% higher yield strength‌ (550 MPa vs. 380 MPa in 316L)‌2.5× better chloride stress corrosion cracking resistance‌ (per NACE TM0177)‌Thinner wall designs‌ possible due to enhanced mechanical properties, reducing material costs by 18-22%.‌Q2: Do your astm a789/ a790 uns s31803 Duplex pipes/tubes comply with sour service requirements?‌‌A:‌ Yes. All ‌duplex stainless steel pipes‌ are:‌NACE MR0175/ISO 15156 Compliance for H₂S environmentsCompliance to ‌NACE TM0284 (Hydrogen Induced Cracking)‌ standardsPMI-verified for standard levels.‌Q3: Can you customize ASTM A789/ASTM A790 UNS S31803 Duplex pipe/tube dimensions beyond standard ASTM specs?‌‌A:‌ Absolutely. We specialize in ‌non-standard duplex pipe fabrication‌:‌OD Range‌: 10mm – 2000mm (with ±0.3mm precision)‌Wall Thickness‌: 1.0mm – 80mm (including SCH 5S to SCH XXS)‌Cutting Services‌: Plasma, laser, or abrasive waterjet to ±0.15mm tolerance.‌Q4: What surface finishes are available for corrosion resistance?‌‌A:‌ Choose from:‌Electropolished (EP)‌: Ra ≤0.4μm (ideal for ‌high-purity chemical processing‌)‌Pickled & Passivated‌: ASTM A380-compliant oxide layer‌Bead Blasted‌: Uniform 120-220 grit profile for aesthetic applications.‌Q5: How do you ensure material traceability?‌‌A:‌ Every pipe includes:‌EN 10204 3.1/3.2 certificates‌ with heat number tracking‌PMI Test Reports‌ (XRF verification of alloy composition)‌Mill Test Reports‌ covering mechanical properties and hydrostatic tests.Third Party Inspection is acceptble‌Q6: What’s your lead time for urgent offshore projects?‌‌A:‌ We guarantee:‌3-5-day turnaround‌ for standard sizes from our stock‌30-day production‌ for custom orders (vs. industry-average 45 days)‌24/7 logistics coordination‌ with real-time ‌CFR,CIF shipping updates‌.‌Q7: What if we need technical support after delivery?‌‌A:‌ Our ‌Lifetime Technical Support‌ covers:Free metallurgical consultation within 7 business hoursOnline failure analysis (available in worldwide)‌12-monthes warranty‌ against manufacturing defects.