Duplex Stainless Steel Round Bars

Duplex Stainless Steel Round Bars

Ashapura Steel’s Duplex stainless steel round bars and rods are a popular choice in the manufacturing industry due to their unique properties. These bars consist of a mixture of austenitic and ferritic stainless steels, which makes them highly resistant to corrosion and oxidation. In this post, we will discuss the various types of duplex stainless steel round bars available in the market and their applications. Duplex round bars and rods are available in different shapes and sizes, including duplex steel bar, duplex steel bright bar, duplex steel hex bar, round bar duplex ss, duplex spring steel bar, duplex square bar, and duplex flat bar.

Each type of round bar has its own set of properties that make it suitable for specific applications. One of the most popular types of duplex stainless steel suppliers in Maharashtra round bars and rods is duplex stainless steel s32750.

Types of Duplex Stainless Steel Round Bars

Duplex stainless steel round bars are widely used in various industries due to their excellent corrosion resistance, high strength, and durability. However, not all duplex stainless steel round bars are the same. There are different types of duplex stainless steel round bars that have unique properties and characteristics.

Standard Duplex Stainless Steel Round Bars

The standard duplex stainless steel round bars are made up of equal parts of austenitic and ferritic phases. They have a balanced microstructure that provides them with good mechanical properties such as high strength and toughness. The most common grades of standard duplex stainless steel round bars include ASTM A276 Type 2205 and ASTM A276 Type 2304.

ASTM A276 Type 2205 is a widely used grade for its excellent corrosion resistance and high strength. It contains chromium, molybdenum, and nitrogen which provide it with superior resistance to pitting and crevice corrosion in chloride environments.

ASTM A276 Type 2304 is a low-alloyed grade that has good corrosion resistance in mild environments such as fresh water or atmospheric conditions. It is also known for its cost-effectiveness compared to other grades.

Super Duplex Stainless Steel Round Bars

Super duplex stainless steel round bars have higher levels of chromium, molybdenum, and nitrogen than standard duplex stainless steel round bars. This results in improved corrosion resistance in harsher environments such as seawater or acidic solutions. Super duplex stainless steel round bars also have higher strength than standard duplex grades.

ASTM A276 Type 2507 is a popular super duplex grade due to its excellent corrosion resistance in aggressive environments such as seawater or chemical processing plants. It also has high strength which makes it suitable for heavy-duty applications.

Hyper Duplex Stainless Steel Round Bars

Hyper duplex stainless steel round bars are the newest addition to the duplex family. They have higher levels of chromium, molybdenum, and nitrogen than super duplex grades which provide them with superior corrosion resistance in highly acidic and corrosive environments.

ASTM A276 Type 2707 is a hyper duplex grade that has excellent resistance to pitting, crevice corrosion, and stress corrosion cracking in harsh environments such as seawater or chemical processing plants. It also has high strength which makes it suitable for demanding applications.

Strength and Corrosion Resistance of Duplex Stainless Steel Round Bars

Corrosion resistance is one of the most important properties of duplex stainless steel round bars. Duplex stainless steels offer a combination of high strength and excellent corrosion resistance, making them ideal for use in harsh environments. Compared to austenitic stainless steels, duplex stainless steels have higher tensile strength and better resistance to chloride stress corrosion cracking and pitting corrosion.

ASTM A276 and ASTM A479 are two commonly used specifications for duplex stainless steel round bars. These specifications cover standard requirements for hot-finished or cold-finished rounds, squares, hexagons, and other shapes of wrought duplex stainless steels. The most common alloy grade is S31803, which has a chemical composition that includes chromium, molybdenum, nickel, and nitrogen.

Strength Properties

One of the key advantages of duplex stainless steel round bars is their high tensile strength. This property makes them suitable for use in applications where high mechanical loads are expected. The yield strength of S31803 ranges from 450 to 620 MPa (65 to 90 ksi), depending on the heat treatment condition. The ultimate tensile strength ranges from 620 to 880 MPa (90 to 130 ksi).

Corrosion Resistance Properties

Duplex stainless steel round bars exhibit excellent corrosion resistance properties in many different environments. They are particularly resistant to chloride stress corrosion cracking and pitting corrosion.

Chloride Stress Corrosion Cracking

Chloride stress corrosion cracking occurs when a metal is exposed to a combination of tensile stress and a corrosive environment containing chlorides. This type of corrosion can cause sudden failure without warning signs such as visible deformation or cracks.

Pitting Corrosion

Pitting corrosion is a localized form of corrosion that occurs on the surface of metals in the presence of an electrolyte containing chloride ions. Pits can penetrate deep into the metal surface and cause structural damage if left unchecked.

Round Bar Length

The length of duplex stainless steel round bars can vary depending on the application. Standard lengths range from 3 to 6 meters (10 to 20 feet), but longer lengths are also available upon request.

ASTM A276 and ASTM A479 Duplex Rods

ASTM A276 and ASTM A479 are two specifications that cover standard requirements for hot-finished or cold-finished rounds, squares, hexagons, and other shapes of wrought duplex stainless steels. These specifications include chemical composition, mechanical properties, heat treatment requirements, and other technical details.

Duplex Stainless Steel Round Bars and Rods Specification

SpecificationsASTM A276, A479 / ASME SA276, SA479
GradeDuplex 2205 – UNS S32205/uns S31803
TechniqueCold Drawn, Hot Rolled, Forged Round Bar, Rod, Cold Rolled
ToleranceH8, H9, H10, H11, H12, H13K9, K10, K11, K12 or as per clients’ requirements
StandardAISI, API, ASTM, EN, ASME, BS Round Bars
FinishCold (bright) drawn, centreless ground, hot rolled, smooth turned, peeled, slit rolled edge, hot rolled annealed, Rough Turned, Bright, Polish, Grinding, Centreless Ground & Black
Section3.0 to 12.0mm thickness
FormPrecision Ground Bar, Flat Bar, Square, Round, Half Round Bar, Rod, Rectangle, Hex (A/F), T-Bar, Channel Bar,Blocks, Round Rod, Threaded, Profiles, Billet, Ingot, I/H Bar, Forging, Rings, Hollow, Triangle etc.
SurfaceCold Drawn, Bright, Sand Blasting Finished, Hot Rolled Pickled, Hairline, Polished
ProcessingBar cutting to 650mm
CertificatesEN 10204 / 3.1
Round bar sizeDiameter: 3-~800mm
Flat bar size Thickness: 2 -100mm
Width: 10 to 500mm
Hex Bar size2-100mm A/F
Square bar size4 to 100mm
Angle bar size3mm*20mm*20mm~12mm*100mm*100mm
Billet Size1/2″ to 495mm Diameter
Channel Bar80 x 40mm to 150 x 75mm section; 5.0 to 6.0mm thickness
Hollow Bar32mm OD x 16mm ID to 250mm OD x 200mm ID)
Rectangles Size33 x 30mm to 295 x 1066mm
ConditionHardened & tempered, annealed

Duplex Stainless Steel Round Bars and Rods Material Equivalent Grades

STANDARD WERKSTOFF NR.UNS
Duplex 22051.4462S31803 / S32205

Duplex Stainless Steel Round Bars and Rods Surface Finish

Plate Surface finishGauge (in)Width (max in)
2B – Cold rolled, heat treated, pickled, skin passed Plate10–2472*
2D – Cold rolled, heat treated, pickled plate12–2460
BA Mexinox only18–2848
Polished plate (not brushed)11–2460
Temper rolled plate Mexinox only13–2948

Duplex Stainless Steel Round Bars and Rods Chemical Composition

CDCold drawnPPolished
BDBright drawnSRESlit rolled edge
CGCentreless groundHFHot finished
CFCold finishedHRAPHot rolled annealed and pickled
P&TPeeled and turnedRTRough turned/peeled
STSmooth turnedPRPeeled and reeled

Duplex Round Bars and Rods Weight

SizeKgs / FootKgs / MtrSizeKgs / FootKgs / MtrSizeKgs / FootKgs / Mtr
3mm0.0170.05520mm0.7532.473″10.935.762
1/8″0.0190.06222mm0.9082.9793-1/4″12.841.996
5/32″0.0290.0957/8″0.9263.0383-1/2″14.8548.772
4mm0.030.09824mm1.083.5433-3/4″17.00155.78
3/16″0.0430.14125mm1.183.8714″19.30663.34
5mm0.0470.1541″1.213.974-1/4″21.90872.249
7/32″0.0580.1926mm1.2714.174-1/2″24.448780.34
6mm0.0680.22327mm1.3684.494-3/4″27.36690.249
1/4″0.0760.2491-1/8″1.5345.0335″30.46199.94
7mm0.0910.29830mm1.6915.5485-1/2″36.69121
5/16″0.1180.3871-1/4″1.9246.3496″43.86143.9
8mm0.120.39832mm1.8946.3146-1/2″51.093167.63
9mm0.1520.4981-3/8″2.3037.557″59.432196
3/8″0.170.55735mm2.397.5537-1/2″68.226225
10mm0.1890.6236mm2.4387.9998″77.586254.55
11mm0.2280.74838mm2.7928.90310″121.048397.14
7/16″0.2320.7611-1/2″2.7158.951---
12mm0.2710.88940mm3.0099.872---
1/2″0.3030.9941-5/8″3.210.449---
13mm0.3181.0431-3/4″3.71212.179---
14mm0.3681.20745mm3.80712.555---
9/16″0.3831.2561-7/8″4.2613.977---
15mm0.4241.39148mm4.3314.205---
5/8″0.4731.55150mm4.69815.414---
16mm0.4811.5782″4.84815.906---
17mm0.5431.7912-1/8″5.47517.963---
11/16″0.5731.882-1/4″6.13520.128---
18mm0.612.00160mm6.76822.205---
3/4″0.6822.2372-3/8″6.83822.435---
---2-1/2″7.57624.856---
---2-5/8″8.35427.409---
---2-3/4″9.16930.083---

Duplex Stainless Steel Round Bars and Rods Chemical Composition

GradeUNS NoC %Cr %Ni %P %Si %S %Mo %N %Mn %
31803S31803< 0.0321.0-23.04.5-6.51.03 max1 max0.02 max2.5-3.50.08-0.2< 2.0
2205S32205< 0.0322.0-23.04.5-6.50.03 max1 max0.02 max3.0-3.50.14-0.20< 2.0

Duplex Stainless Steel Round Bars and Rods Mechanical Properties

GradeYS (MPa)UTS (MPa)% ElongationHardness(BHN)
31803450 min.620 min.25 min.293 max.
2205450 min.655 min.25 min.293 max.

Duplex Stainless Steel Bars and Rods Physical Properties

Density (Kg / M3)Modulus of Elasticity (GPa)Poisson’s RatioThermal Conductivity (W/moC)Thermal Capacity (I/KgoC)Electrical Resistivity
78002000.3155000.8

Industrial Application of Stainless Steel Sheet

Defence & Aerospace

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Oil/Gas

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FAQ

1)What is the difference between stainless steel and duplex stainless steel?

Duplex stainless steel is a type of stainless steel that contains both austenitic and ferritic microstructures.both stainless steel and duplex stainless steel offer corrosion resistance, duplex stainless steel stands out for its enhanced corrosion resistance, strength, and toughness, making it suitable for demanding applications in aggressive environments.

2)What is the most common duplex stainless steel?

The most commonly used duplex stainless steel in Maharashtra,like in many other parts of the world, is UNS S31803, also known as 2205 duplex stainless steel. This alloy is widely utilized in various industries due to its excellent combination of corrosion resistance, high strength, and good weldability.

3)What is 22 cr duplex material?

A material referred to as “22Cr duplex” typically indicates a type of duplex stainless steel with a chromium (Cr) content of approximately 22%. Duplex stainless steels are characterized by their two-phase microstructure, consisting of both austenite and ferrite phases. The balanced combination of these phases gives duplex stainless steels their desirable properties, including high corrosion resistance and good mechanical strength.

4)What are duplex standard sizes?

Duplex stainless steel, such as Duplex 2205, is available in a wide range of standard sizes for various products like pipes, tubes, sheets, and bars.
Duplex Pipe and Tubing- common sizes like 1/2″, 3/4″, 1″, 2″, 3″, 4″, 6″, 8″, 10″, and 12″ and sometimes larger.
Duplex Sheet and Plate-Standard sheet sizes may include 1000mm x 2000mm, 1219mm x 2438mm (4ft x 8ft), and larger.
Duplex Round Bars and Rods-Standard lengths for round bars are typically 12 feet (3.66 meters) or 20 feet (6.1 meters), but custom lengths can be ordered.
Duplex Fittings -Duplex fittings, such as elbows, tees, reducers, and flanges, come in various sizes, usually ranging from 1/2″ to 12″ or larger.

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