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Home » Products » DUPLEX AND SUPER DUPLEX PLATES » Duplex Steel Plate 31803

Duplex Steel Plate 31803

Duplex Steel Plate 31803
Duplex Steel Plate 31803
Product Code : 96
Product Description

Duplex Steel Plate 31803

Duplex 31803   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. The structure of 31803 duplex stainless steel consists of austenite pools surrounded by a continuous ferrite phase. In the annealed condition, 31803 contains approximately 40-50% ferrite. Often referred to as the work horse grade, 31803 is the most widely used grade in the duplex family of stainless steels.

The advantage of a duplex structure is that it combines the favorable qualities of a ferritic alloy (stress corrosion cracking resistance and high strength) with those of an austenitic alloy (ease of fabrication and corrosion resistance).

Usage of 31803 Duplex stainless steel should be limited to temperatures below 600° F.  Extended elevated temperature exposure can embrittle 31803 stainless.



Corrosion Resistance

2205 duplex stainless steel is a cost effective solution for many applications where the 300 series stainless steels are susceptible to chloride stress corrosion cracking. Stress corrosion cracking occurs when stainless steels are subjected to tensile stress, while in contact with solutions containing chlorides. Increasing temperatures also increase the susceptibility of stainless steels to stress corrosion cracking.

The combination of chromium, molybdenum and nitrogen convey the good resistance of 31803 to chloride pitting and crevice corrosion. This resistance is extremely important for services such as marine environments, brackish water, bleaching operations, closed loop water systems and some food processing applications. The high chromium, molybdenum and nitrogen contents of 2205 provide corrosion resistance superior to common stainless steels, such as, 316L and 317L in most environments.






Chemical Composition, %

Cr


Ni

Mo

C

N

22.0-23.0


4.50-6.50

3.00-3.50

.030 Max

0.14-0.20

Mn


Si

P

S

Fe

2.00 Max


1.00 Max

.030 Max

.020 Max

Balance



Characteristics of Duplex 31803

High resistance to chloride stress corrosion cracking

  • Resistance to chloride pitting and crevice corrosion

  • Good general corrosion resistance

  • Good sulfide stress corrosion resistance

  • High Strength

  • Good weldability and workability


Applications of Duplex 31803

  • 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




ASTM Specifications

Pipe Smls

Pipe Welded

Tube Smls

Tube Welded

Sheet/Plate

Bar

Flanges, Fittings & Valves

A790

A790

A789

A789

A240

A276

A182




Mechanical Properties
Specified Tensile Properties ASTM A240


Ultimate Tensile Strength, ksi Minimum

.2% Yield Strength, ksi Minimum

Hardness Max.

95

65

31 Rockwell C



EQUIVALENT OF DUPLEX 31803 :

COUNTRY

USA

USA


FRANCE

EUROPEAN


JAPAN

STANDARDS

ASTM

UNS

NACE

AFNOR

EN

ISO

JIS

GRADE

A182

A240

A276

A789

A790

A815

S31803

S32205

MR0175

Z3CrNi 22.05 AZ

1.4462

4462-318-03-I

SUS 329J3L



COUNTRY

SWEDEN

CHINA

KOREA

GERMANY

USA

STANDARDS

SS

GB

KS

DIN

AISI

GRADE

2377

00Cr22Ni5Mo3N

STS 329J3L

X2CrNiMoN22.5.3

F51/ F60 (A182)


COUNTRY



STANDARDS

BS (WROUGHT)

SS (CAST)

GRADE

318S13

332C15




 


CONQUEST STEEL & ALLOYS


CONQUEST STEEL & ALLOYS
Shreepati Castle, D- 1 9/10, 1st Flooor, 11th Khetwadi, Mumbai - 400004, Maharashtra, India
Mr. Amit Jain (Partner)
Mr. Jignesh Shah (Sales Executive)
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