UNS S31803 Tubes
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We could produce UNS S31803 tubes,S31803 tubes,UNS S31803 tubings,UNS S31803 seamless tubes,UNS S31803 U Bend Tubes,UNS S31803 U-tube,UNS S31803 welded tubes,S31803 boiler tubes, UNS S31803 heat exchanger tubes,UNS S31803 Capillary tubes,UNS S31803 Thermocouple tubes,UNS S31803 Superheater tubes and reheater tubes,S31803 condenser tube,UNS S31803 finned tubes,UNS S31803 furnace tubes,UNS S31803 instrumentation tubes,UNS S31803 Evaporator tubes,UNS S31803 honed tubes, UNS S31803 coiled tubes,UNS S31803 Precision tubes,UNS S31803 High pressure tubes,UNS S31803 hydraulic tubes from china

The outer diameter of UNS S31803 tubes that we could do is from 0.4MM to 850MM,The thickness of UNS S31803 tubes that we could do is from 0.12MM to 100MM

As per surface finish of UNS S31803 seamless tubes and welded tubes, we could do 180G, 320G Satin / Hairline(Matt Finish, Brush, Dull Finish),PICKLING surface finish as per the requirement of the clients

We could produce UNS S31803 seamless tubes and weled tubes as per the standard of ASTM B729 and ASTM B464

As per heat treatment of UNS S31803 tubes, we could do solution treatment, ageing treatment as per the requirement of the clients

As per material of UNS S31803 tubes, our raw material has been melted by  EAF+VOD-ESR methods

UNS S31803 is the most widely used duplex (ferritic/austenitic) stainless steel grade

The chemical composition of S31803 seamless tubes and weled tubes is as follows

Nominal   Composition


Weight %


0.03 max


1.0 max


2.0 max


0.03 max


0.02 max


2.5 – 3.5


21.0 – 23.0


4.5 – 6.5


0.08 – 0.2

The mechanical propery of UNS S31803 seamless tubes and weled tubes is as follows




Ultimate  Tensile Strength *

90 min  Ksi (620 Mpa)

0.2 %  Yield Strength *

65 min  Ksi (450 Mpa)


25 % min

Reduction  of Area *

45 % min

Charpy  Impact Toughness

55 mean/  40 min J at –46o C

We have following inspection equipment for our S31803 tubes:Ultrasonic Inspection Lines,Eddy Current Inspection Line,Hydraulic Test Equipment,OBLF Direct Reading Spectrometer,Metallurgical Microscope,Spectrophotometer,Electronic Balance,Impact Testing Machine,Impact Specimen Projector,Universal Testing Machine,Carbon-Sulfur Analyzer,INNOV Portable Alloy Analyzer,Rockwell Hardness Tester,Intergranular Corrosion Testing Machine,Endoscope

We have following production equipment for our UNS S31803 seamless tube and weled tubes:Peeling lines,Piercing lines,Cold drawing lines,Cold rolling lines,Straightening machine,Annealing furnace,Pickling pool

All our Minonic 90 Tubes will be wrapped in shrink foil, pipe ends protected with foil or plastic caps, reinforced frame construction made of wood, both front-sides closed, frame construction secured with steel strapping as per the requirement of the clients

Our UNS S31803 seamless tubes and weled tubes are widely used in many industries like,Feed-water and steam generator tubing in power plants,Brine heaters and evaporator bodies in salt plants,Sulphuric and hydrouoric acid alkylation plants,Industrial heat exchangers,Cladding for crude oil distillation columns,Splash-zone sheathing in offshore structures, seawater service,Plants for isotope separation in the production of nuclear fuel pumps and valves used in the manufacture of chlorinated hydrocarbons and so on

We could supply Third party inspection certificate for UNS S31803 seamless tubes and weled tubes  such as TUV, SGS, LR, MOODY, ITS, DNV,BV,Lloyd's Reg. of Shipping ,GL,API as per the requirement of the clients.

Please send us the size of UNS S31803 seamless tubes and weled tubes that you need, we are glad to quote the best price for our clients.

Except UNS S31803 tubes,we also could produce UNS S31803 flanges,UNS S31803 plates,UNS S31803 fastener,UNS S31803 bolts,UNS S31803 fittings,UNS S31803 pipes,UNS S31803 bars,UNS S31803 springs