Kanakratna Steelage Private Limited

Super duplex stainless steels (SDSS) are engineered to meet the demands of industries requiring high strength and excellent corrosion resistance. Among these, UNS S32205, commonly known as duplex 2205, has emerged as a popular choice for piping applications in aggressive environments.

The UNS S32205 Super Duplex Pipe combines a two-phase microstructure—approximately equal proportions of austenite and ferrite—offering superior resistance to stress corrosion cracking (SCC), pitting, and crevice corrosion. Its high yield strength and excellent toughness make it ideal for offshore, chemical processing, oil & gas, and desalination applications.

This article provides a comprehensive analysis of UNS S32205 super duplex pipes, covering composition, mechanical and corrosion properties, manufacturing, standards, applications, and market outlook.

• Density: 7.8 g/cm³

• Melting Range: 1370 – 1400 °C

• Thermal Conductivity: 15 W/m·K

• Electrical Resistivity: 0.6 µΩ·m

• Coefficient of Thermal Expansion: 13 µm/m°C

• Mechanical Testing: Tensile, yield, elongation, hardness, and impact testing.

• Corrosion Testing: ASTM G48 (pitting resistance), stress corrosion cracking tests.

• Non-Destructive Testing (NDT): Ultrasonic, radiography, eddy current testing.

• Dimensional Checks: OD, wall thickness, length, straightness, and surface finish.

• PMI (Positive Material Identification): Confirms UNS S32205 compliance.

Additional Information:

• Production Capacity: IN TONS
• Delivery Time: READY STOCK
• Packaging Details: The packaging of the product is done using an effective method of packaging. It all includes- • Shrink-wrapping • Bubble wrapping • Carton boxes • Wooden crates/pallets/boxes

In industries where extreme environments such as aggressive chemicals, seawater, and oxidizing agents prevail, conventional materials like stainless steels and even super duplex steels often fail. This is where Hastelloy C276 Rods play a crucial role.

Hastelloy C276, designated as UNS N10276 and Werkstoff Nr. 2.4819, is a nickel-molybdenum-chromium alloy with tungsten designed for outstanding corrosion resistance in a wide variety of chemical environments.

Hastelloy C276 Rods are solid cylindrical bars of this alloy, used either as raw material for machining and forging components or as direct-use rods in industries requiring high strength and corrosion resistance.

The exceptional corrosion resistance of Hastelloy C276 stems from its balanced alloy chemistry.

Hastelloy C276 rods possess excellent mechanical strength combined with toughness across a wide temperature range.

• Mechanical Testing: Tensile, yield, elongation, hardness

• Corrosion Testing: ASTM G28, ASTM G48

• Non-Destructive Testing (NDT): Ultrasonic, radiographic, eddy current

• Positive Material Identification (PMI): Confirms UNS N10276 composition

• Dimensional Inspection: Ensures tolerance compliance

Additional Information:

• Production Capacity: IN TONS
• Delivery Time: READY STOCK
• Packaging Details: The packaging of the product is done using an effective method of packaging. It all includes- • Shrink-wrapping • Bubble wrapping • Carton boxes • Wooden crates/pallets/boxes

The evolution of stainless steels has been driven by the need for materials that can resist corrosion, maintain high mechanical strength, and perform reliably in aggressive environments. Among these, super duplex stainless steels (SDSS) stand out because they combine the strength of ferritic stainless steels with the corrosion resistance of austenitic stainless steels.

One of the most widely used grades in this category is UNS S32760, covered under ASTM A276 for bars and shapes. Also known by trade names like Zeron® 100, it has become an industry standard for applications requiring excellent pitting resistance, high strength, and toughness—even in the harshest environments such as offshore oil & gas, desalination, and chemical processing.

This article provides a comprehensive analysis of A276 UNS S32760 Round Bars, including their metallurgy, standards, properties, manufacturing process, advantages, applications, and global demand.

• Density: 7.8 g/cm³

• Melting Range: 1350–1450 °C

• Thermal Conductivity: 14.5 W/m·K

• Electrical Resistivity: 0.85 µΩ·m

• Coefficient of Expansion: 13.0 µm/m°C

• Mechanical Testing: Tensile, yield, elongation, hardness, impact.

• Corrosion Testing: ASTM G48 (pitting corrosion), SCC tests.

• Non-Destructive Testing (NDT): Ultrasonic testing, eddy current, radiography.

• PMI (Positive Material Identification): Ensures compliance with UNS S32760 composition.

• Dimensional Checks: Straightness, diameter, and surface finish.

Additional Information:

• Production Capacity: IN TONS
• Delivery Time: READY STOCK
• Packaging Details: The packaging of the product is done using an effective method of packaging. It all includes- • Shrink-wrapping • Bubble wrapping • Carton boxes • Wooden crates/pallets/boxes

Fasteners are the backbone of mechanical assemblies, and in industries that deal with corrosive, high-pressure, and demanding conditions, choosing the right fastener is critical. Traditional stainless steels like 304 or 316 often fail in chloride-rich or aggressive environments due to pitting, crevice corrosion, or stress corrosion cracking (SCC). To overcome these challenges, engineers developed Duplex Stainless Steels, a family of alloys with a dual-phase microstructure of ferrite (50%) and austenite (50%).

Duplex Bolts, manufactured from grades such as UNS S31803 (F51), UNS S32205, and UNS S32750 (Super Duplex), offer a combination of high strength, excellent corrosion resistance, and cost-effectiveness. They are widely used in oil & gas, marine, desalination, chemical, pulp & paper, and structural applications, where failure is not an option.

This article provides an in-depth analysis of Duplex Bolts, covering their composition, properties, manufacturing, standards, applications, and global market trends.

• Hex Bolts – Standard mechanical fastening.

• Stud Bolts – Common in flanges, pressure vessels.

• Anchor Bolts – Civil engineering, construction.

• U-Bolts / J-Bolts – Pipe supports and clamps.

• Socket Head Cap Bolts – Machinery and equipment.

• Eye Bolts – Lifting and rigging applications.

• Tensile & Hardness Tests

• Positive Material Identification (PMI)

• Non-Destructive Testing (NDT) – UT, RT, PT.

• Salt Spray Testing – Corrosion resistance.

• Hydrostatic & Pressure Testing

• Impact Testing (Charpy)

Additional Information:

• Production Capacity: 30 TONS
• Delivery Time: READY STOCK
• Packaging Details: The packaging of the product is done using an effective method of packaging. It all includes- • Shrink-wrapping • Bubble wrapping • Carton boxes • Wooden crates/pallets/boxes

Super Duplex Stainless Steel Sheets are advanced stainless steel products that belong to the duplex stainless steel family but with higher alloying content, giving them superior corrosion resistance, high strength, and excellent durability.

The term “Super Duplex” refers to a group of stainless steels that have a balanced two-phase microstructure of approximately 50% austenite and 50% ferrite but with higher levels of chromium (24–26%), molybdenum (3–4%), and nitrogen, making them stronger and more corrosion-resistant than standard Duplex 2205 stainless steel.

The most common super duplex grade used in sheet form is Super Duplex 2507 (UNS S32750 / UNS S32760). These sheets are widely employed in offshore oil & gas, marine, chemical processing, power generation, and desalination plants where both mechanical strength and resistance to aggressive corrosion are crucial.

Super Duplex stainless steels achieve their outstanding properties through a carefully balanced chemical composition.

Super Duplex Sheets offer exceptional mechanical strength, approximately twice the yield strength of austenitic stainless steels like 304L and 316L.

• Density: 7.85 g/cm³

• Melting Point: 1350 – 1425 °C

• Thermal Conductivity: 15 W/m·K (better than austenitic steels)

• Electrical Resistivity: 850 nΩ·m

• Elastic Modulus: 200 GPa

• Thermal Expansion: 13 µm/m·K (lower than 316L → reduced thermal stress)

• Chemical Composition Testing (Spectrometry)

• Tensile & Hardness Testing

• Impact Toughness Testing

• Pitting Resistance Testing (ASTM G48)

• Microstructure Examination (Ferrite/Austenite balance check)

• Non-Destructive Testing (Ultrasonic, Eddy Current)

• Dimensional Accuracy Tests

Additional Information:

• Production Capacity: IN TONS
• Delivery Time: READY STOCK
• Packaging Details: The packaging of the product is done using an effective method of packaging. It all includes- • Shrink-wrapping • Bubble wrapping • Carton boxes • Wooden crates/pallets/boxes

Duplex 2205 Stainless Steel Round Bars are one of the most widely used duplex stainless steel products in engineering industries. Duplex 2205 is a two-phase alloy, containing approximately equal proportions of austenite and ferrite microstructures, which gives it twice the strength of standard austenitic stainless steels (like 304 or 316) while also offering excellent corrosion resistance.

The most common designations of Duplex 2205 are:

• UNS S31803 → Original standard grade.

• UNS S32205 → Modified version with tighter composition limits, offering improved corrosion resistance.

Round bars of Duplex 2205 are extensively used in marine, oil & gas, chemical processing, power generation, and structural applications because they combine high strength, toughness, and excellent resistance to chloride-induced stress corrosion cracking (SCC), crevice corrosion, and pitting.

Duplex 2205 derives its strength and corrosion resistance from its balanced composition of chromium, nickel, molybdenum, and nitrogen.

Duplex 2205 round bars offer superior mechanical properties compared to standard austenitic stainless steels.

• Density: 7.8 g/cm³

• Melting Range: 1385 – 1440 °C

• Thermal Conductivity: 19 W/m·K (higher than austenitic grades, better heat dissipation)

• Electrical Resistivity: 850 nΩ·m

• Elastic Modulus: 200 GPa

• Thermal Expansion: 13.7 µm/m·K (lower than austenitic grades, reducing thermal stress)

Additional Information:

• Production Capacity: IN TONS
• Delivery Time: READY STOCK
• Packaging Details: The packaging of the product is done using an effective method of packaging. It all includes- • Shrink-wrapping • Bubble wrapping • Carton boxes • Wooden crates/pallets/boxes

Pipe fittings are indispensable in any piping system, providing the means to connect, change direction, reduce, and control the flow of fluids. In industries such as oil & gas, marine, chemical, desalination, and power generation, the demand for fittings that can withstand high pressures, aggressive media, and corrosive environments has grown significantly. Traditional austenitic stainless steels (such as 304 and 316) are insufficient for extreme conditions due to pitting corrosion, crevice attack, and stress corrosion cracking (SCC) in chloride-bearing environments.

To overcome these limitations, Duplex Stainless Steel—a family of steels with a microstructure of approximately 50% ferrite and 50% austenite—has emerged as an ideal material for pipe fittings.

Duplex Pipe Fittings combine the high strength of ferritic stainless steels with the superior toughness and corrosion resistance of austenitic stainless steels. With yield strengths twice that of 316 stainless steel and excellent resistance to localized and stress corrosion, duplex fittings are now a preferred choice for critical piping applications worldwide.

• Mechanical Tests – Tensile, hardness, impact.

• Non-Destructive Testing (NDT) – UT, RT, PT, MT.

• Corrosion Testing – Pitting resistance, salt spray.

• Positive Material Identification (PMI) – Verify chemical composition.

• Hydrostatic Tests – Leak-proof integrity.

• Dimensional & Visual Inspections – Ensure tolerances.

Additional Information:

• Production Capacity: 50 TONS
• Delivery Time: READY STOCK
• Packaging Details: The packaging of the product is done using an effective method of packaging. It all includes- • Shrink-wrapping • Bubble wrapping • Carton boxes • Wooden crates/pallets/boxes

The demand for advanced materials that can withstand harsh conditions has led to the development of duplex stainless steels. These steels are called “duplex” because their microstructure consists of approximately equal amounts of austenite and ferrite. This dual-phase structure gives them a unique balance of strength and corrosion resistance, making them superior to conventional austenitic (300 series) or ferritic stainless steels.

One of the most versatile product forms is the Duplex Steel Round Bar, which is a cylindrical bar of duplex stainless steel used in machining, forging, structural components, and heavy-duty applications. These bars serve industries such as oil & gas, petrochemicals, marine engineering, desalination, paper & pulp, and power generation.

Duplex Steel Round Bars are especially valuable where chloride-induced corrosion, stress corrosion cracking, and pitting pose challenges. Their high strength, excellent toughness, and cost-effectiveness make them one of the fastest-growing categories of stainless steels.

The performance of duplex steel round bars is directly linked to their chemical composition.

Additional Information:

• Production Capacity: IN TONS
• Delivery Time: 5 TO 10 Days
• Packaging Details: The packaging of the product is done using an effective method of packaging. It all includes- • Shrink-wrapping • Bubble wrapping • Carton boxes • Wooden crates/pallets/boxes

Duplex stainless steels (DSS) have emerged as a preferred material for piping systems in industries where corrosion resistance, mechanical strength, and reliability are critical. With a two-phase microstructure of ferrite and austenite, DSS combines the strength of ferritic stainless steels with the corrosion resistance of austenitic stainless steels.

Duplex stainless steel pipe fittings—including elbows, tees, reducers, couplings, flanges, and caps—are essential for constructing durable and reliable piping networks in chemical, petrochemical, oil & gas, marine, and power generation industries.

This article provides a comprehensive overview of duplex stainless steel pipe fittings, covering grades, composition, mechanical and corrosion properties, standards, manufacturing, fabrication, applications, and market trends.

The chemical composition varies depending on the grade:

Additional Information:

• Production Capacity: 20 TONS
• Delivery Time: READY STOCK
• Packaging Details: The packaging of the product is done using an effective method of packaging. It all includes- • Shrink-wrapping • Bubble wrapping • Carton boxes • Wooden crates/pallets/boxes

Super Duplex Stainless Steel Round Bars are high-performance engineering materials that combine exceptional strength, toughness, and corrosion resistance. They belong to the family of duplex stainless steels, which have a two-phase microstructure consisting of approximately 50% austenite and 50% ferrite.

Unlike conventional stainless steels, Super Duplex grades offer:

• Twice the strength of austenitic grades such as 304 and 316.

• Excellent resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC).

• Long service life in harsh chloride-rich environments such as seawater, oilfields, desalination plants, and chemical processing industries.

Super Duplex grades such as UNS S32750, S32760, and S32550 are the most widely used. When supplied as round bars, they are machined into shafts, fasteners, fittings, flanges, and structural components that operate in demanding industries.

(Typical composition for UNS S32750)

• Density: 7.8 g/cm³

• Melting Point: ~1350°C

• Modulus of Elasticity: 200 GPa

• Thermal Conductivity: 14.5 W/m·K

• Specific Heat Capacity: 500 J/kg·K

• Coefficient of Thermal Expansion: 13 μm/m·K (20–100°C)

• Magnetism: Partially magnetic (due to ferrite phase).

• Solution Annealing: 1020–1100°C.

• Water quenching to restore duplex structure.

• Tensile & Hardness Testing

• Charpy Impact Test

• ASTM G48 Pitting Corrosion Test

• Positive Material Identification (PMI)

• Ultrasonic & Eddy Current Testing

Additional Information:

• Production Capacity: IN TONS
• Delivery Time: READY STOCK
• Packaging Details: The packaging of the product is done using an effective method of packaging. It all includes- • Shrink-wrapping • Bubble wrapping • Carton boxes • Wooden crates/pallets/boxes

The demand for advanced materials that can withstand harsh conditions has led to the development of duplex stainless steels. These steels are called “duplex” because their microstructure consists of approximately equal amounts of austenite and ferrite. This dual-phase structure gives them a unique balance of strength and corrosion resistance, making them superior to conventional austenitic (300 series) or ferritic stainless steels.

One of the most versatile product forms is the Duplex Steel Round Bar, which is a cylindrical bar of duplex stainless steel used in machining, forging, structural components, and heavy-duty applications. These bars serve industries such as oil & gas, petrochemicals, marine engineering, desalination, paper & pulp, and power generation.

Duplex Steel Round Bars are especially valuable where chloride-induced corrosion, stress corrosion cracking, and pitting pose challenges. Their high strength, excellent toughness, and cost-effectiveness make them one of the fastest-growing categories of stainless steels.

The performance of duplex steel round bars is directly linked to their chemical composition.

• Mechanical Tests: Tensile, yield, hardness.

• Corrosion Tests: ASTM G48 (pitting), ASTM A262.

• Non-Destructive Tests (NDT): Ultrasonic, radiographic, dye penetrant.

• PMI (Positive Material Identification): To confirm grade.

• Dimensional Inspection: Tolerance checks.

Additional Information:

• Production Capacity: IN TONS
• Delivery Time: 7 TO 10 Days
• Packaging Details: The packaging of the product is done using an effective method of packaging. It all includes- • Shrink-wrapping • Bubble wrapping • Carton boxes • Wooden crates/pallets/boxes

The UNS S32750 Round Bar, also known as Super Duplex 2507 Round Bar, is a high-performance stainless steel product designed for extreme environments where both high mechanical strength and superior corrosion resistance are required. Belonging to the Super Duplex Stainless Steel family, UNS S32750 is a premium grade developed to overcome the limitations of standard duplex and austenitic stainless steels.

The alloy is characterized by a dual-phase microstructure, containing nearly equal proportions of austenite (FCC) and ferrite (BCC) phases. This structure offers a balance of toughness, ductility, and exceptional resistance to stress corrosion cracking (SCC). Compared to standard duplex stainless steel (UNS S31803/2205), UNS S32750 contains higher chromium, molybdenum, and nitrogen, which results in enhanced resistance to localized corrosion, such as pitting and crevice corrosion.

The chemical makeup of UNS S32750 is carefully controlled to maximize corrosion resistance and strength.

• Tensile Test

• Hardness Test

• Charpy Impact Test

• Pitting Resistance Test

• Intergranular Corrosion Test (ASTM A262)

• Ultrasonic & Radiographic Testing

• Third-Party Inspection (TUV, Lloyd’s, BV, SGS)

Additional Information:

• Item Code: UNSS32750
• Production Capacity: IN TONS
• Delivery Time: READY STOCK
• Packaging Details: The packaging of the product is done using an effective method of packaging. It all includes- • Shrink-wrapping • Bubble wrapping • Carton boxes • Wooden crates/pallets/boxes

Duplex stainless steels (DSS) are a class of stainless steels that contain approximately equal amounts of austenite and ferrite, offering a unique combination of high strength, corrosion resistance, and toughness. This dual-phase microstructure allows duplex steels to outperform conventional austenitic or ferritic stainless steels in many aggressive environments.

Duplex stainless steel round bars are a versatile form of DSS used extensively in chemical, petrochemical, oil & gas, marine, and power generation industries. They provide the structural strength of ferritic stainless steels and the corrosion resistance of austenitic grades, making them ideal for critical applications where reliability is paramount.

This article provides a comprehensive analysis of duplex stainless steel round bars, including composition, mechanical and physical properties, standards, manufacturing, machining, applications, advantages, limitations, and market trends.

The chemical composition of duplex stainless steel round bars depends on the specific grade. A representative table for standard duplex (UNS S32205):

• Density: 7.8 g/cm³

• Melting Range: 1370 – 1450 °C

• Thermal Conductivity: 14 – 15 W/m·K

• Electrical Resistivity: 0.6 – 0.85 µΩ·m

• Coefficient of Thermal Expansion: 13 µm/m°C

Additional Information:

• Production Capacity: IN TONS
• Delivery Time: READY STOCK
• Packaging Details: The packaging of the product is done using an effective method of packaging. It all includes- • Shrink-wrapping • Bubble wrapping • Carton boxes • Wooden crates/pallets/boxes

Stainless steel sheets are widely used across industries, but in many aggressive, chloride-rich environments, traditional austenitic stainless steels like 304 and 316 fail due to stress corrosion cracking (SCC), pitting, and crevice corrosion. To overcome these challenges, engineers and metallurgists developed Duplex Stainless Steels — alloys with a dual-phase microstructure of approximately 50% ferrite and 50% austenite.

Among these, Duplex UNS S31803 (also known as ASTM A182 F51) sheets have gained global recognition. They offer an outstanding combination of mechanical strength, corrosion resistance, and cost-effectiveness, making them an excellent alternative to both 300-series stainless steels and more expensive nickel-based alloys.

Duplex S31803 Sheets (F51) are extensively used in industries like:

• Oil & Gas (offshore platforms, subsea equipment)

• Marine Engineering (shipbuilding, desalination)

• Chemical Processing

• Pulp & Paper

• Construction & Infrastructure

Their ability to perform reliably in harsh, high-stress, and chloride-laden conditions makes them indispensable in today’s industrial world.

• Mechanical Testing (Tensile, Hardness, Impact).

• Chemical Analysis (Spectrometry, Wet Analysis).

• Corrosion Testing (ASTM G48, ASTM A923).

• NDT (Ultrasonic, Radiography, Dye Penetrant).

• PMI (Positive Material Identification).

Additional Information:

• Production Capacity: IN TONS
• Delivery Time: READY STOCK
• Packaging Details: The packaging of the product is done using an effective method of packaging. It all includes- • Shrink-wrapping • Bubble wrapping • Carton boxes • Wooden crates/pallets/boxes