317L Round Bar

ASTM A790 UNS S31803 Seamless Pipes

ASTM A790 UNS s31803 Seamless Pipes

Seamless Pipe Suppliers for UNS S31803, ASTM A790 UNS S31803, UNS S31803 Duplex Steel Seamless Pipe.

Pipes made from A790 UNS S31803, seamless S31803 pipe, and welded S31803 pipe

Detailed Information:

The main advantage of using duplex stainless steel alloys is that they have superior corrosion resistance properties amongst the other classes. Especially in industries that process both sulfur and chloride ions, the duplex S31803 seamless pipe is advantageous because of its stress-related corrosion cracking properties. Conventional steel pipes have very little resistance to such corrosive ions, so they tend to crack when sulfide or chloride ions are deposited on their walls.

To prevent stress corrosion cracking, ASTM A790 UNS S31803 Seamless Pipe (Welded and Seamless) has been developed. Besides being suitable for these conditions, UNS S31803 pipe suppliers recommend it also for the following conditions: pitting and crevice corrosion solutions. As a matter of fact, seamless S31803 pipes will exhibit exceptional resistance to pitting and crevice corrosion even in highly oxidizing and acidic solutions.

This alloy has a higher pitting resistance equivalent value than alloys like 304 or 316 stainless steel. With excellent impact toughness even at low temperatures, UNS S31803 Duplex Steel Seamless Pipe is a competitive alternative to austenitic stainless steel grades 316 and 317 in terms of price. The alloy is two times stronger than both grades, so the walls of the A790 UNS S31803 pipe can be thinner. In addition to resulting in a lighter-weight S31803 welded pipe, this also results in lower costs.

The ASTM A790 seamless pipe specification is UNS S31803

Standard Specification It conforms to ASTM A 312, ASME SA 312, A790, SA790, ASTM A928 and EN 10216-5.
Size 11” to 6” NB Sch 10s, 40s, 80s, & 160s
Wall Thickness 0.01 to 60 mm
SS Seamless Pipe Length
  • A single random length of 5 to 7 meters
  • A double random length of 10-12 meters
Seamless SS Pipe Surface Finish A cold finish, a bright finish, a polished finish, annealing, pickling, or as required by the client
Standard In addition to JIS, AISI, ASME, ASTM, AMS, GB, DIN, EN, GOST, etc.
Manufacturing types A seamless joint, a welded joint, an ERW joint, an EFW joint
Manufacturing Shapes There are four basic shapes: round, square, rectangle, and box
Manufacturing Technology Formed by heat or cold
Other Grades 446 of the Social Security Act
Inspection, Test Reports EN  In accordance with Section 10204 3.1, Mill Test Certificates are required, along with PMI Test Reports, Chemical Reports, Mechanical Reports, NABL-approved lab reports, and third-party inspection reports.
Technique Hot Rolled and Cold Rolled


The UNS S31803 pipe chemical composition












2205 (UNS S31803)

Min Max

– 0.030

– 2.00

– 1.00

– 0.030

– 0.020

21.0 23.0

2.5 3.5

4.5 6.5

0.08 0.20

The mechanical composition of Duplex S31803 stainless steel pipes


Tensile Strength

(MPa) min

Yield Strength

0.2% Proof

(MPa) min


(% in 50mm) min


Rockwell C (HR C)

Brinell (HB)

UNS S31803 / 2205




31 max

293 max

The equivalent ASTM grade of UNS S31803 pipe





Old British


Swedish SS

Japanese JIS









UNS S31803





SUS 329J3L



Physical properties of ASME SA790 UNS S31803 pipe

Grade 2205





Mean Coeff of Thermal

Expansion (μm/m/°C)


Conductivity (W/m.K)



0-100°C( J/kg.K)




0-100°C 0-315°C 0-538°C at 100°C at 500°C
UNS S31803 782 190 13.7 14.2 19 418 850


The tolerances of ASTM A790 UNS S31803 pipe

NPS Designator Variations in outside diameter that are permissible
Over In. Under In.
1/8 to 1-1/2, incl 1/64 (0.015) 1/32 (0.031)
Over 1-1/2 to 4, incl 1/32 (0.031) 1/32 (0.031)
Over 4 to 8, incl 1/16 (0.062) 1/32 (0.031)
Over 8 to 18, incl 3/23 (0.093) 1/32 (0.031)

A document for UNS S31803 pipe

  • Reports from laboratories are approved by the NABL
  • A document that relates to the traceability of materials
  • The Generalised System of Preferences (GSP) requires Form A to be submitted with the application
  • Test results for raw materials
  • Commercial invoices include HS codes
  • A letter of guarantee
  • Qualitative assurance plans (QAPs)
  • Documents certifying compliance with NACE MR0175 and MR0103 standards
  • This is the WPS/PQR for welding procedures (Specifications/Qualifications Record)
  • Here are a few heat treatment charts to get you started
  • The Material Test Certificates (MTC) required by EN 10204 3.1 and EN 10204 3.2
  • A fumigation certificate can be obtained by following these steps

Packing & Marking

Seamless Pipes are protected from damage during shipment with ASTM A790 UNS S31803 Packages. The ASTM A790 UNS S31803 Seamless Pipes we export are marked with Grade, Lot No, Size, and our trademark, while the standard export packaging is wooden cases. Upon request, we can also add a special label to the pipe.

Assurance of quality

Starting with the purchase of materials, our ASTM A790 UNS S31803 Seamless Pipes undergo strict inspections throughout the production process. Our clients appoint certified inspection agencies to verify material reports, dimensions, and quality conformity. They are visually inspected for compliance with ASTM, ASME, DIN, EN, and JIS standards.

The application of UNS S31803 seamless pipe

  • Desulfurization of flue gases with equipment
  • The digestion of pulp mills, bleaching, and pre-steaming of chips are processes that are used in pulp mills
  • The equipment used in the food processing industry
  • The piping and heat exchangers used in oil fields
  • A chemical process involves the use of heat exchangers, pipes, and vessels

Countries We Export:

Afghanistan, Albania, Algeria, Andorra, Angola, Antigua-Barbuda Argentina, Armenia, Australia, Austria, Azerbaijan, Bahamas, Bahrain, Bangladesh, Barbados, Belarus, Belgium, Belize, Benin, Bhutan, Bolivia, Bosnia-Herzegovina, Botswana, Brazil, Brunei, Bulgaria, Burkina-Faso, Burundi, Côte d’Ivoire, Cabo Verde, Cambodia, Cameroon, Canada, Central African Republic, Chad, Chile, China, Colombia, Comoros, Congo (Congo-Brazzaville), Costa-Rica, Croatia, Cuba, Cyprus, Czechia (Czech Republic), Democratic Republic of the Congo, Denmark, Djibouti, Dominica, Dominican Republic, Ecuador, Egypt, El Salvador, Equatorial Guinea, Eritrea, Estonia, Eswatini (fmr. “Swaziland”), Ethiopia, Fiji, Finland, France, Gabon, Gambia, Georgia, Germany, Ghana, Greece, Grenada, Guatemala, Guinea, Guinea-Bissau, Guyana, Haiti, Holy See, Honduras, Hungary, Iceland, India, Indonesia, Iran, Iraq, Ireland, Israel, Italy, Jamaica, Japan, Jordan, Kazakhstan, Kenya, Kiribati, Kuwait, Kyrgyzstan, Laos, Latvia, Lebanon, Lesotho, Liberia, Libya, Liechtenstein, Lithuania, Luxembourg, Madagascar, Malawi, Malaysia, Maldives, Mali, Malta, Marshall Islands, Mauritania, Mauritius, Mexico, Micronesia, Moldova, Monaco, Mongolia, Montenegro, Morocco, Mozambique, Myanmar (formerly Burma), Namibia, Nauru, Nepal, Netherlands, New Zealand, Nicaragua, North Korea, North Macedonia, Norway, Oman, Pakistan, Palau, Palestine-State, Panama, Papua, New Guinea, Paraguay, Peru, Philippines, Poland, Portugal, Qatar, Romania, Russia, Rwanda, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Samoa, San Marino, Sao Tome and Principe, Saudi Arabia, Senegal, Serbia, Seychelles, Sierra Leone, Singapore, Slovakia, Slovenia, Solomon Islands, Somalia, South Africa, South Korea, South Sudan, Spain, Sri Lanka, Sudan, Suriname, Sweden, Switzerland, Syria, Tajikistan, Tanzania, Thailand, Timor-Leste, Togo, Tonga, Trinidad and Tobago, Tunisia, Turkey, Turkmenistan, Tuvalu, Uganda, Ukraine, United Arab Emirates, United Kingdom, United States of America, Uruguay, Uzbekistan, Vanuatu, Venezuela, Vietnam, Yemen, Zambia, Zimbabwe.

Cities We Supply:

London, New-York, Paris, Moscow, Tokyo, Dubai, Singapore, Barcelona, Los-Angeles, Madrid Rome, Chicago, Toronto, San-Francisco, Abu-Dhabi, St-Petersburg, Amsterdam, Berlin Prague, Washington,Istanbul, Las-Vegas, Doha, Seoul, Sydney, Beijing,  Miami, Munich, Milan, San-Diego, Bangkok, Vienna, Dublin, Vancouver, Boston,  Zurich,  Melbourne, Budapest, Houston, Seattle, Montreal, Hong-Kong, Frankfurt, Sao-Paulo, Tel-Aviv, Copenhagen, Calgary, Orlando, Atlanta, Dallas, Hamburg, Osaka, Lisbon, Austin, Phoenix Naples, Oslo, Denver, Stockholm, Riyadh, Delhi, Buenos Aires, San-Jose, Brussels, Portland Philadelphia, Ottawa, Helsinki, Valencia, Brisbane, Warsaw, Minneapolis, Shanghai, Lyon, Adelaide, Edmonton, Marseille, Muscat, Athens, Stuttgart, Rio-De-Janeii, Baltimore, Auckland, Cologne, New-Orlean, Kuwait-City,  Kiev, Hanover, Perth, Minsk, Bucharest, Nashville, Dusseldorf, Manchester, Sacramento, Glasgow, Mexico-City, Salt-Lake-Ci, Raleigh, Cracow