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UNS S31803

We are professional UNS S31803 material factory from China

UNS S31803 is the most widely used duplex (ferritic/austenitic) stainless steel grade. It finds applications due to both excellent corrosion resistance and high strength..
We could supply UNS S31803 Stainless Steel in following forms:
Forging:Forged Rings,Forged Pipes,Rolled Rings,Forging Sleeves,Forging Disks,Forged Bushings,Forging Sleeves,Forged Tube Sheets,Forged Shafts,Forged Valve Parts(Valve Bodies,Valve seat rings,valve bonnets) and so on
Sheet,Plate,Strips,Coils
Bar:Round Bars,Square bars,flat bars,hollow bars,hex bars and so on
Pipe & Tube:Seamless tubes,seamless pipes,welded pipes,welded tubes,tubings,coiled tubes,U-bend Tubes.
Fittings (elbows, tees,stub-ends,returns,caps,crosses,reducers,and pipe nipples)
Wire:welded wires,wire rods
Flanges:in slip-ons,blinds,weld-necks,lapjoints,long welding necks,socket welds
Fasteners:bolts,screws,nuts,studs,Washers,Sockets,pins
Springs:Compression Springs,Extension Springs,Torsion Springs, tension spring, disc spring, wave spring,Spiral Springs, Automotive Springs
Cnc Machining Parts,CNC turning parts,CNC Stamping parts
The Chemical composition of UNS S31803 is as follows:
  C Si Mn P S Ni Cr Mo N
Min 4.5 21.0 2.5 0.08
Max 0.030 1.00 2.00 0.030 0.020 6.5 23.0 3.5 0.20
 
The mechanical property of UNS S31803 is as follows
 

Typical Mechanical Properties*

Tensile UTS
N/mm² 

0.2% Proof Stress

N/mm² min

Elongation

% min

Hardness

HB max

Impact

J  

650-880

448

25

290

100

UNS S31803 is widely used in Chemical processing, transport and storage,Oil and Gas exploration and processing equipment,Marine and other high chloride environments,Pulp and paper digesters, liquor tanks and paper machines.
Excellent general corrosion resistance; superior to Grade 316 in most environments. Excellent resistance to localized corrosion including intergranular, pitting and crevice corrosion; the CPT of UNS S31803 is generally at least 35ºC. The grade is also resistant to chloride stress corrosion cracking (SCC) at temperatures of up to about 150ºC. UNS S31803 will often perform well in environments which cause premature failure of austenitic grades. It has better resistance to sea water then Grade 316.
Although UNS S31803 has good high temperature oxidation resistance, this grade - like other duplex stainless steels - suffers from embrittlement if held for even short times at temperatures above 300ºC. If embrittled, this can only be rectified by a full solution annealing treatment. Duplex stainless steels are almost never used above 300ºC.
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