Duplex round bar

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Duplex round bar
What is Duplex round bar ?

Duplex is a type of stainless steel that has austenite and ferrite grain phases in the microstructure. This is why the material possesses properties of both phases. The duplex round bars have relatively higher strength along with improved ductility and toughness.

The material also shows good resistance to corrosion. This is due to the chemical composition which contains materials like nickel, chromium, molybdenum, iron and other alloying elements.

The duplex stainless steel round bar is a cost-effective option for applications that require high strength and corrosion resistance. Thus, they are found in manifolds, raisers, etc., in the oil & gas industry.

Even though duplex steel shows good resistance to oxidation, it cannot be used in elevated temperature conditions. This is due to the formation of a brittle phase for ferrite at relatively low temperatures.

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India's first ever supplier of duplex rod and hex bar as per ASTM A276 , read about duplex steel round bar typical tolerance range

What is the duplex steel round bar typical tolerance range ?
  • The dimensional tolerance for duplex steel round bars includes ISO h9, h10 and h11. Herein, h9 is the tightest and h11 is the most relaxed tolerances.
  • ASTM standards also provide specific dimensional tolerance depending on the size of the round bar.
  • There are also length and straighteness tolerance which depends on various factors.
  • With precise machining techniques, tighter tolerance can be achieved to enhance the overall product quality.

We are most reliable stockist of duplex flat bar use for oil and gas industry in Mumbai, check methods are used to improve machinability of duplex steel bar

Duplex rod

Duplex rod

Duplex steel round bar

Duplex steel round bar

ASTM A276 duplex flat bar

ASTM A276 duplex flat bar

What methods are used to improve machinability of duplex steel bar ?
  • The cold drawn duplex steel bar offers enhanced machinability. Other ways to improve it are:
  • Using the right cutting tools and following the right cutting parameters like speed and depth of cut.
  • Proper coolant should be used for cooling the cutting tool during machining.
  • Effective chip control is also necessary.
  • If you are using hot rolled ASTM A276 duplex steel rectangular bar, then annealing can be useful. It relives the internal stress and improves the mechanical properties of the material.

At affordable prices, we have ready stock of duplex stainless steel square and rectangular bar in diameter ranging from 6.35 mm to 355.6 mm. Order online to save money.

Duplex round bar specification

Duplex round bar specification

 

Diameter Length Application
1/4 to 14" upto 24" or custom Chemical & Petrochemical
Specification Grade Form
ASTM A276 | ASME SA276 Duplex 2205 (UNS S32205/ S31803)
Round, hex , square, rectangular
We provide ASME SA276 duplex bar stock that is cut to length in any size in accordance with the needs of the client, explore duplex stainless steel bar more available types
List of duplex steel round bar types
Duplex stainless steel round bar

Duplex stainless steel round bar

  • Dia: 3mm - 450mm
  • Length: 3 to 6 meter
  • ASTM A276 | ASME SA276
ASME SA276 duplex hex bar

ASME SA276 duplex hex bar

  • Rough Polish
  • Black
  • NO.4 Finish
DSS square bar

DSS square bar

  • Hardening & Tempering
  • Solution Annealing
  • Soft Annealing,
Are odd sizes of duplex alloy hot and cold drawn bar hard to find? Don't worry, you can now order online at dealer prices, see properties of duplex steel alloys annealed bar
ASTM A276 duplex square bars chemical properties
Mn N C S Si P Cr Mo Ni
2205
(S32205)
2.0
max
min: 0.14
max: 0.20
0.03
max
0.02
max
1.0
max
0.03
max
min: 22.0
max: 23.0
min: 3.0
max: 3.5
min: 4.5
max: 6.5
2205
(S31803)
2.0
max
min: 0.08
max: 0.20
0.03
max
0.02
max
1.0
max
0.03
max
min: 21.0
max: 23.0
min: 2.5
max: 3.5
min: 4.5
max: 6.5
Duplex hex bars mechanical properties
Material Hardness (HB) MAX Yield Strength
0.2% ksi (min)
Elongation % Tensile Strength
ksi (min)
Duplex 217 65 25 90
Duplex rod equivalent
STANDARD UNS WNR
Duplex UNS S31803 / UNS S32205 1.4462 / 1.4462
What are duplex rod additional coatings or treatments ?

The duplex rods can undergo various surface treatments to improve their appearance and performance.

  • Procedures like pickling, passivation and electro-polishing can improve the corrosion resistance properties of the rods. They will be able to give better performance in harsh environments.
  • Coatings can reduce the effects of wear & tear and increase the longevity of the rods.

You can contact Regent Steel & Engineering Co. to get custom surface treatments and coatings as per your application requirements.

how thickness influences duplex stainless steel bar material properties ?
  • The thickness of a duplex stainless steel bar can affect its mechanical properties. Thicker bars have greater strength and hardness. They also show better impact resistance.
  • Thicker duplex flat bars might be more susceptible to like pitting and crevice corrosion in aggressive environments.
  • Thicker duplex square bars need higher heat input during the welding process. They are also more prone to welding distortion.
What methods were used to improve duplex hex bar ductility and toughness ?
  • Solution annealing dissolves harmful precipitates and improves the duplex microstructure, which enhances ductility and toughness.
  • Aging or precipitation hardening after solution annealing can further refine the microstructure and enhance the properties of duplex hex bars.
  • Rapid cooling can lead to the formation of detrimental phases and reduce ductility. Thus, controlled cooling rates are employed.
  • Refining the grain structure can improve toughness.

You can contact Regent Steel & Engineering Co. to learn what methods can help improve the ductility and toughness of the hex bars, as per your application requirements.

Hardness of duplex steel bar
Tensile Strength 0.2% Proof Stress Reduction of area Elongation Hardness
MPA MPA % % HRC
Min Min Min Min Min
1034 827 25 17 40
Size chart of duplex stainless steel round bar
Metric Japanese US Bar Canadian/ASTM
Diam. (mm) Bar Size Diameter (mm) Bar Size Diam. (Inch) Bar Size Diameter (mm2) Bar Size
6 6 13 13 0.500 #4 300 20M
5 5 6 6 0.250 #2 100 10M
7 7 16 16 0.625 #5 500 25M
5.5 5.5 10 10 0.375 #3 200 15M
8 8 19 19 0.750 #6 700 30M
10 10 25 25 1.000 #8 1500 45M
9 9 22 22 0.875 #7 1000 35M
50 50
11 11 29 29 1.125 #9 2500 55M
14 14 35 35 1.375 #11
12 12 32 32 1.250 #10
16 16 38 38 1.500 #12
20 20 44 44 1.750 #14
22 22 48 48 1.875 #15
18 18 41 41 1.625 #13
28 28 57 57 2.250 #18
25 25 51 51 2.000 #16
32 32
40 40
36 36
44 44
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