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YUHONG GROUP CO.,LIMITED
YUHONG GROUP CO.,LIMITED

ASTM A789 UNS S31803 Duplex Steel Pipe/Tube

UNS S31803 is also known as grade 2205. The duplex stainless steel family includes a wide range of different materials, however, the duplex 31803 is the most common one. Duplex-grade stainless steel alloys have ferritic/austenitic properties, giving these materials superior strength and excellent resistance to oxidation.

  • astm a789 uns s31803
  • astm a789 uns s31803

Chemical Requirements of ASTM A789 UNS S31803 Duplex Steel Pipe/Tube


UNS

C

Mn

P

S

Si

Ni

Cr

Mo

N

S31803

0.030

2.00

0.030

0.020

1.00

4.5-6.5

21.0-23.0

2.50-3.50

0.08-0.20





Mechanical Property of ASTM A789 UNS S31803 Duplex Steel Pipe/Tube

20°C

Tensile Strength

Yield Strength

Elongation%

Hardness

Density

Min

621Mpa

448Mpa

25%

-

7.82g/cm3

Max

-

-

-

31HRC

7.82g/cm3




Properties of ASTM A789 UNS S31803 Duplex Steel Pipe/Tube


UNS S31803/2205 is a duplex grade with a ferritic-austenitic microstructure. The alloy consists of around 40-50% ferrite in the annealed condition. The duplex microstructure has the high strength of the ferritic grades whilst retaining the corrosion resistance of the austenitic grades. It is not uncommon to see the metal used as a practical solution to chloride-induced stress cracking, which is the Achilles' heel of stainless steel.



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