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S31803 Bolts

S31803 Bolts
S31803 Bolts
  • Introduction
  • Parameters
  • Application
UNS S31803 / F51/ 2205
 
S31803 is a nitrogen enhanced duplex stainless steel that was developed to combat common corrosion problems encountered with the 300 series stainless steels. “Duplex” describes a family of stainless steels that are neither fully austenitic, like 304 stainless, nor purely ferritic, like 430 stainless. Often referred to as the work horse grade, 2205 is the most widely used grade in the duplex family of stainless steels.


The characteristics of S31803:
High general corrosion resistance
Pitting and crevice corrosion resistance superior to 317L austenitic stainless steel
High resistance to chloride stress corrosion cracking
High resistance to corrosion fatigue and erosion
Good sulfide stress corrosion resistance
High strength
Excellent impact toughness
Lower thermal expansion and high thermal conductivity than austenitic stainless steels
Good workability and weldability
 

Chemical Composition,%

C

Cr

Ni

Mo

N

0.03max

21.0-23.0

4.5-6.5

2.5-3.5

0.08-0.2

 

P

Mn

S

Si

Fe

0.035max

2.0max

0.02max

1.0max

Balance

 



Mechanical Properties

Form

Tensile min.

0.2% Yield min.

Elongation min.

Hardness

Bar

620 Mpa

448 Mpa

25%

290HB max

 


 


S31803 Bolts
Description:
Size:   M6-M100(1/4-4 inch)
Surface: hex head
Material: UNS S31803 / F51/ 2205

 
The applications of UNS S31803 / F51/  Duplex 2205:
Chemical process vessels, piping and heat exchangers
Pulp mill digesters, bleach washers, chip pre-steaming vessels
Food processing equipment
Oil field piping and heat exchangers
Flue gas desulfurization equipment
Effluent scrubbing systems
Rotors, fans, shafts, and press rolls requiring combined strength and corrosion resistance
Cargo tanks for ships and truck


The forms of UNS S31803 / F51/  Duplex 2205:
Sheet
Plate
Pipe & Tube (welded and seamless)
bar
Fittings
Fastener
 

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