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Astm A790 / A789 UNS S31803 Duplex Pipe Tube

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.

Scope of application

1.1x00a0;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.

1.2x00a0;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.

1.3x00a0;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.

1.4x00a0;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.

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.
Technical Data Sheet of ASTM A790 S31803
Product Name ASTM A790 S31803 Duplex Seamless Pipe
Type  Seamless
Shape Square / Rectangular / Round
Standard  GB, AISI, ASTM, DIN, EN, JIS
Grade Stainless steel 304 / 304L / 310S / 316L / 316Ti / 316LN / 317L / 904L / 2205 / 2507 / 32760 / 253MA / 254SMo / XM-19 / S31803 / S32750 / S32205 / F50 / F60 / F55 / F60 / F61 / F65 etc
Monel 400 / Monel K-500 
Inconel 600 / Inconel 601 / Inconel 625 / Inconel 617 / Inconel 690 / Inconel 718 / Inconel X-750
Incoloy A-286 / Incoloy 800 / Incoloy 800H / Incoloy 800HT
Incoloy 825 / Incoloy 901 / Incoloy 925 / Incoloy 926
Nimonic 75 / Nimonic 80A / Nimonic 90 / Nimonic 105 / Nimonic C263 / L-605
Hastelloy B / Hastelloy B-2 / Hastelloy B-3 / Hastelloy C / Hastelloy C-276 / Hastelloy C-22
Hastelloy C-4 / Hastelloy C-2000 / Hastelloy G-35 / Hastelloy X / Hastelloy N
PH stainless steel 15-5PH / 17-4PH / 17-7PH 
Out diameter  Seamless Pipe 6MM - 1174MM or customized
Thickness  Seamless Pipe 1mm - 80mm or customized
Max Length Seamless Pipe 12000mm or customized
Finish  2B, Pickling, Polished, Brushed, Sandblast, BA, EP
Packing  waterproof polybag, wooden box, end cap, wooden crame/pallet
Inspection  TUV, SGS, BV, ABS, LR and so on
Application  Chemical, Pharmaceutical & Bio-Medical, Petrochemical & Refinery, Environmental, Food Processing, Aviation, Chemical Fertilizer, Sewage Disposal, Desalination, Waste Incineration etc. 
Processing Service  Machining : Turning / Milling / Planing / Drilling / Boring / Grinding / Gear Cutting / CNC Machining  
Deformation processing :  Bending / Cutting / Rolling / Stamping
Welded 
Forged 
Delivery Time 7-40 days
Trade Term FOB CIF CFR CIP DAP DDP EXW 
Payment T/T, L/C, D/A, D/P, Western Union, MoneyGram, According to customer requirements payments for offline orders.
Transportation By air, by sea, by train, by truck
Sample Free
Warranty Trade assurance after sales service
ASTM A790 Uns S31803 duplex pipe tube features
PREN value 32 to 33
The corrosion resistance of the medium alloy type UNS 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 A790 / A789 Uns S31803 duplex pipe tube application
Neutral Chloride Environment
Refining Industry
Petrochemical and Chemical Industry
Chemical Industry Conveying Pipeline
Oil & Gas Industry
Pulp and Paper Industry
Fertilizer Industry
Urea Industry
Phosphate Fertilizer Industry
Seawater Environment
Energy and Environmental Protection Industry
Light Industry And food industry
food and pharmaceutical industry equipment
high-strength structural parts












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