The duplex round bars are made up of a material known for the ferritic and austenitic stainless steel qualities. There are different forms such as the Duplex 2205 Hex Bar, round bar, flat bar and square bars. The different shapes help serve in different application types. The square bar is used for strength and in structural applications. The Duplex Flat Bar is used for its low weight and it is useful for structural lattices. The corrosion resistance of the material with strength makes the bars to be used in petroleum, petrochemical, marine, power generation and in many other applications.

Specification of Duplex Roundbar

Grade

Duplex Steel UNS S31803 | S32205

Specification

EN, DIN, JIS, ASTM, BS, ASME, AISI 

Standard

ASTM A276, ASME SA276

Size

6 mm to 120 mm

Diameter

6 mm to 350 mm Diameter

Thickness

100 mm to 600 mm Length

Tolerance

+/-0.2 mm or as per clients’ requirements

Length

1 Meter to 6 Meters, Custom cut lengths

Finish

Black, Bright Polished, Rough Turned, NO.4 Finish, Matt Finish, BA Finish

Form 

Round Bars, Square Bars, Flat Bars, Threaded Bars, Hollow Bars, Hexagonal Bars, Triangular Bars

Chemical Composition of Duplex Roundbar​

Grade

UNS No

C %

Cr %

Ni %

P %

Si %

S %

Mo %

N %

Mn %

31803

S31803

< 0.03

21.0-23.0

4.5-6.5

1.03 max

1 max

0.02 max

2.5-3.5

0.08-0.2

< 2.0

2205

S32205

< 0.03

22.0-23.0

4.5-6.5

0.03 max

1 max

0.02 max

3.0-3.5

0.14-0.20

< 2.0

Mechanical Properties of Duplex Roundbar

Grade

YS (MPa)

UTS (MPa)

% Elongation

Hardness(BHN)

31803

450 min.

620 min.

25 min.

293 max.

2205

450 min.

655 min.

25 min.

293 max.

Physical Properties of Duplex Roundbar

Density (Kg / M3)

Modulus of Elasticity (GPa)

Poisson’s Ratio

Thermal Conductivity (W/moC)

Thermal Capacity (I/KgoC)

Electrical Resistivity

7800

200

0.3

15

500

0.80

Applications of Duplex Roundbar

petrochemical-industry

Petroleum Refineries

heat-exchangers

Boilers / Heat Exchangers

Steam Exhausts

Steam Exhausts

Pipelines

Electric Generation Plants

Fertilizer Plants

Chemical Plants

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