Duplex Steel Pipes & Tubes

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Table of Content

What is a Duplex Steel Pipe?
Specification of Duplex Steel Pipes
Duplex Pipe Composition
Duplex Stainless Steel Tubes Chemical Composition
Mechanical Properties for Stainless Steel Duplex Pipes
Offering Duplex Steel Pipes With Indian Standards
Duplex Stainless Steel Pipes Equivalent Grades
Dimension Chart of Duplex Steel Pipes
Duplex Stainless Steel Pipes Weight Chart

Duplex Stainless Steel Pipes, Duplex Steel Tubes, 2205 Duplex stainless steel Pipe, Duplex Stainless Steel Tubes Supplier. Duplex Steel Seamless Tubes, Duplex Steel Welded Pipes, Duplex Stainless Steel ERW Pipes Suppliers, Manufacturer of Duplex Stainless Steel Pipes & Exporter of Duplex Steel Tubes

What is a Duplex Steel Pipe?

Duplex stainless steel pipes are a type of stainless steel pipe by their unique dual-phase structure, which combines both ferritic and austenitic stainless steel. Its dual composition, usually 50% ferritic and 50% austenitic, provides enhanced strength and resistance.

Duplex stainless steel pipes are known for their excellent resistance to pitting corrosion and their ability to use less nickel compared to other stainless steels. The name “Duplex” refers to the pipe’s dual-phase structure, which enhances its mechanical properties. These pipes are often preferred over austenitic alloys like ASTM A312 TP304 or ASTM A312 TP316 because they offer better corrosion resistance.

Duplex steel pipes, also known as duplex tubes, manufactured to high standards under the Duplex Pipe Code (ASME SA790), these pipes come in various forms, such as duplex steel tubes and stainless steel duplex pipe. Duplex steel tubes are particularly strong due to their high levels of molybdenum, chromium, and nitrogen. They resist chloride pitting, crevice corrosion, and stress corrosion cracking. For example, duplex steel seamless tubes are great for applications needing a high strength-to-weight ratio, while duplex steel round tubes offer the strength of thicker nickel alloys in a lighter form.

Duplex steel welded tubes are resistant to both organic and inorganic acids, making them suitable for tough environments. However, duplex steel EFW tubes & pipes should only be used in applications below 600°F (316°C) due to their temperature limits.

Lakshya Steel – Duplex Steel Pipes Supplier In India

Lakshya Steel is known as the top supplier of high-quality duplex steel pipes in India, catering to a variety of industrial applications. Our Duplex pipes are designed to meet rigorous standards, ensuring exceptional performance. We offer an extensive range of UNS S31803 duplex steel pipes, known for their superior strength and hardness, making them suitable for demanding industrial uses. Additionally, our UNS S32205 duplex steel pipes provide robust corrosion resistance, surpassing that of conventional stainless steels.

For specialized applications, our super duplex steel pipes and tubes, including UNS S23750, UNS S32760, and UNS S32950, are ideal for industries such as chemical processing, oil and gas, marine, food, and pollution control. These super duplex steel seamless pipes are available in various sizes and shapes, adhering to both national and international quality standards.

Lakshya Steel ensures that all our duplex steel seamless pipes are manufactured with high-quality raw materials and can be customized to order, providing flexibility in size and shape with competitive price.

In addition to our comprehensive product range, we also provide custom manufacturing services for duplex stainless welded and ERW pipes. Our manufacturing capabilities extend from 4mm to 219mm in seamless pipes and from 5mm to 1219.2mm in welded pipes. Our team uses the latest technology and rigorous quality control measures to manufacture pipes that meet international standards. As leading duplex steel pipe suppliers in India, Lakshya Steel is committed to delivering reliable, high-quality products tailored to your specific needs. Contact us for durable and precision-engineered duplex steel pipes.

Duplex Steel Pipes, Duplex Steel S31803 Pipes, Duplex Steel S31803 Pipes Manufacturer, Duplex Steel Seamless Pipes, Duplex Steel Welded Pipes, Duplex Steel ERW Pipes, Duplex Steel Pipes Manufacturer, Duplex Steel Pipe Suppliers In Mumbai.

Duplex Steel Tubing From Lakshya Steel

Lakshya Steel is a leading supplier of duplex steel tubes in India, offering a broad range of products to meet diverse industrial needs. Our extensive inventory includes duplex stainless steel tubes in various grades, sizes, and specifications to provide the right solution for your specific needs.

Our duplex steel tubes are ideal for demanding environments such as heat exchangers, desalination plants, and chemical processing facilities. They are renowned for their exceptional corrosion resistance and mechanical strength, making them a reliable choice for critical applications.

As a trusted supplier, we offer top-quality duplex steel tubes with industry standards or customized sizes and specifications. Contact us today for superior duplex steel tubes to discuss your requirements and experience the quality and reliability of our products.

Duplex Steel Seamless Tubes, Duplex Steel Welded Tubes, Duplex Stainless Steel ERW Tubes, Duplex Steel S31803 Tubes Exporter, Duplex Steel Tubing, Duplex Stainless Steel Tubes Supplier In Mumbai India.

Specification of Duplex Steel Pipes

Standard	:	ASTM / ASME SA 790. SA 789 , SA 790
Grade	:	UNS NO. S 31803, S 32205
Type	:	SEAMLESS / ERW / WELDED/ FABRICATED
Length	:	Single Random, Cut Length
End	:	Plain End, Bevelled End, Threaded

Duplex Pipe Composition

Over the past 30 years, improvements in steelmaking have made duplex steel pipes more popular. These pipes have a special structure that mixes two types of steel: austenitic and ferritic. Each type of steel has its own single-phase properties, but when combined, they form a strong two-phase structure with a balanced mix of austenite and ferrite. This blend in duplex stainless steel pipes gives them better strength and resistance to corrosion than regular steels. Duplex pipes are tough and durable, making them great for industrial applications.

Common Name	UNS No	BS EN No	Typical Chemical Composition %						0.2% proof strength N/mm2 (min)
Common Name	UNS No	BS EN No	%C	Cr	Ni	Mo	N	Cu	0.2% proof strength N/mm2 (min)
2304	S32304	1.4362	0.015	23.0	4.0	0.055	0.13		400
2205	2205	1.4462	0.015	22.0	5.5	3.0	0.14	–	450
2205	S32205	1.4462	0.015	22.5	5.5	3.3	0.17		450
255(UR52N)	S32520	1.4507	0.015	25.0	7.0	3-5	0.28	0.13	550
2507	S32750	1.4410	0.015	25.0	7.0	4.5	0.28	0.3	550
Zeron 100	S32760	1.4501	0.015	25.0	7.0	3.5	0.25	0.8	550
Sandvik SAF3207	S33207	–	0.03	31	7.5	4.0	0.50	0.75	700

Duplex Stainless Steel Tubes Chemical Composition

Grade	C≤	Mn≤	P≤	S≤	Si≤	Ni	Cr	Mo	N	Cu
S31803	0.03	2.00	0.03	0.02	1.00	4.5–6.5	21.0–23.0	2.5–3.5	0.08–0.20	–
S32205	0.03	2.00	0.03	0.02	1.00	4.5–6.5	22.0–23.0	3.0–3.5	0.14–0.20	–
S32750	0.03	1.20	0.035	0.02	0.80	6.0-8.0	24.0-26.0	3.0-5.0	0.24-0.32	0.5
S32760	0.05	1.00	0.03	0.01	1.00	6.0-8.0	24.0-26.0	3.0-4.0	0.20-0.30	0.50–1.00

Mechanical Properties for Stainless Steel Duplex Pipes

Grades	Density (g/cm 3)	Density (lb/in 3)	Melting Point (°C)	Melting Point (°F)
S31803 / S32205	7.805	0.285	1420 – 1465	2588 – 2669
S32750 / S32760	7.8	0.281	1350	2460

Offering Duplex Steel Pipes With Indian Standards

ASTM A789/A789M: This specification covers duplex stainless steel tubing, including grades UNS S31803, S32205, and S32750. These tubes are used in critical applications such as boilers, superheaters, and heat exchangers.

ASTM A789/ASME SA789: This standard pertains to seamless and welded ferritic/austenitic stainless steel tubing suitable for general service. It includes various grades like S31500 (SAF1805), S31803 (SAF2205), S32205 (SAF2205), and S32750 (SAF2507).

These standards ensure that duplex stainless steel pipes and tubes meet high-quality and performance requirements, making them ideal for demanding industrial applications in India.

Duplex Steel Pipe & Tubes Types

Seamless Pipes

ASTM A789 Duplex Steel S31803 Seamless Pipes, S32750 Super Duplex Steel Seamless Pipe, ANSI B36.19 Super Duplex Stainless Steel S32760 Seamless Piping, Ferritic Stainless Steel S31803 Seamless Pipes Supplier, Duplex Stainless Steel 1.4462 Seamless Pipes Exporter.

Welded Pipes

ASTM A790 Duplex stainless Steel S32750 Welded Pipes, S32760 Super Duplex Steel Welded Pipe, ANSI B36.10 Super Duplex Steel S32205 Welded Piping, Ferritic Stainless Steel S32205 Welded Pipes Supplier, Super Duplex Stainless Steel 1.4410 Welded Pipes Exporter.

Seamless Tubes

ASTM A213 Super Duplex Stainless Steel S32760 Seamless Tubes, S31803 Super Duplex Steel Seamless Tubing, ASME SA213 Duplex stainless Steel S32750 Seamless Tubing, Ferritic Stainless Steel S32750 Seamless Tubes Supplier, Duplex steel 1.4462 Seamless Tubes Exporter.

Welded Tubes

ASTM A790 Duplex stainless steel S32750 Welded Tubes, S31803 Super Duplex Steel Welded Tubing, ASME SA790 Ferritic Stainless Steel S31803 Welded Tubing, super Duplex Steel S32760 Welded Tubes Supplier, Super Duplex Stainless Steel 1.4410 Welded Tubes Exporter.

ERW Pipes/Tubes

ASTM A789 Duplex Steel S32760 ERW Pipes, Super Duplex stainless steel S32205 ERW Round Tubing, S32750 Super Duplex Steel ERW Pipes, Ferritic Stainless Steel S31803 ERW Pipes Supplier, Duplex Steel 1.4462 ERW Tubes Exporter.

EFW Pipes

STM A790 Super Duplex Stainless steel S32750 EFW Pipes, ANSI B36.19 Super Duplex Stainless Steel S31803 EFW Piping, S32750 Super Duplex Steel EFW Pipes, Ferritic Stainless Steel S32750 EFW Pipes Supplier, Duplex Stainless Steel 1.4410 EFW Pipes Exporter.

Duplex Stainless Steel Pipe Grades

Duplex 2205 Pipe

Duplex UNS S31803 Pipes

Duplex Stainless Steel Pipes Equivalent Grades

STANDARD	WERKSTOFF NR.	UNS
Duplex 2205	1.4462	S31803 / S32205
Super Duplex 2750	1.4410	S32750 / S32760

Customized Duplex Pipes

Customized Duplex Pipes offer exceptional durability and strength, especially in environments exposed to corrosive compounds like chloride stress and pitting corrosion. These pipes are designed with high tensile strength, surpassing that of standard austenitic stainless steel grades.The lower nickel content in duplex pipes contributes to their economical nature while maintaining robustness and resilience. As a leading distributor and manufacturer of Duplex Stainless Steel Pipes, we provide high-quality products tailored to your specifications.

Duplex Stainless Steel Pipe sizes

Duplex Stainless Steel Seamless Pipe

Size: 4 – 219mm
Thickness : 0.5 – 20mm
Length: Single, Double Random & Cut Length

Duplex Steel Welded Pipe

Size: 5.0 – 1219.2 mm
Thickness : 0.5 – 20mm
Length: Single, Double Random & Cut Length

Dimension Chart of Duplex Steel Pipes

Specification	:	ASTM A 790 ASME SA 790
Dimensions	:	ASTM, ASME and API
Size	:	1/2″ TO 6′ IN OD & NB IN Various SWG & SCH
Specialized in	:	Large Diameter Size
Schedule	:	SCH20, SCH30, SCH40, STD, SCH80
Type	:	Seamless / Welded / ERW / Fabricated
Form	:	Round, Hydraulic, Etc.
Length	:	Single Random, Double Random & Cut Length.
End	:	Plain End, Beveled End, Threaded
Test	:	Hardness Test Flattening Test Pitting Resistance Test Chemical Analysis – Spectro Analysis Micro and MacroTest Flaring Test Intergranular Corrosion (IGC) Test Mechanical Testing Such as Tensile of Area Positive Material Identification – PMI Testing

Duplex Stainless Steel Pipes Weight Chart

Surface Finish of Duplex Steel Seamless Tubes

Surface Finish		Internal Surface(ID)		Exterbal Surface(OD)
		Roughness Average(RA)		Roughness Average(RA)
		μ inch	μm	μ inch	μm
AP	Annealed & Pickled	Not defined	Not defined	40 or Not defined	1.0 or Not defined
BA	Beight Annealed	40,32,25,20	1.0,0.8,0.6,0.5	32	0.8
MP	Mechanical Polish	40,32,25,20	1.0,0.8,0.6,0.5	32	0.8
EP	Electro Polish	15,10,7,5	0.38,0.25,0.20;0.13	32	0.8

Duplex Steel Pipe Pressure Rating

Tube O.D. (in.)	Wall Thickness of Tube (inches)
	.028	.035	.049	.065	.083	.095	.109	.120
	Working Pressure (psig)
1/8	7900	10100
1/4	3700	4800	7000	9500
5/16		3700	5400	7300
3/8		3100	4400	6100
1/2		2300	3200	4400
3/4			2200	3000	4000	4600
1				2200	2900	3400	3900	4300

Duplex Stainless Steel Pipe Schedule Chart

1/8″ IPS(.405″ O.D.)	3 1/2″ IPS( 4.000″ O.D.)
Seamless Pipes, SCH 40, 80	Pipes, SCH 10, 40, 80, 160, XXH
1/4″ IPS(.540″ O.D.)	4″ IPS(4.500″ O.D.)
Pipes, SCH 10, 40, 80	Seamless Pipes, SCH 10, 40, 80, 160, XXH
3/8″ IPS(.675″ O.D.)	5″ IPS( 5.563″ O.D.)
Seamless Pipes, SCH 10, 40, 80	Pipes, SCH 10, 40, 80, 160, XXH
1/2″ IPS(.840″ O.D.)	6″ IPS(6.625″ O.D.)
Seamless Pipes, SCH 5, 10, 40, 80, 160, XXH	Seamless Pipes, SCH 5, 10, 40, 80, 120, 160, XXH
3/4″ IPS(1.050″ O.D.)	8 ” IPS(8.625″ O.D.)
Pipes, SCH 10, 40, 80, 160, XXH	Stainless Pipes, SCH 5, 10, 40, 80, 120, 160, XXH
1″ IPS:(1.315′ O.D.)	10″ IPS(10.750″ O.D.)
Seamless Pipes, SCH 5, 10, 40, 80, 160, XXH	Pipes, SCH 10, 20, 40, 80 (.500), TRUE 80(.500)
1-1/4″ IPS(1.660″ O.D.)	12″ IPS(12.750″ O.D.)
Seamless Pipes, SCH 10, 40, 80, 160, XXH	Pipes, SCH 10, 20, 40(.375), TRUE40(.406), SCH80(.500)
1-1/2″ IPS(1.900″ O.D.)	14″ IPS(14.000″ O.D.)
Seamless Pipes, SCH 10, 40, 80, 160, XXH	Pipes, SCH10 (.188), SCH40 (.375)
2″ IPS(2.375″ O.D.)	16″ IPS(16.000″ O.D.)
Seamless Pipes, SCH 10, 40, 80, 160, XXH	Pipes, SCH10(.188), SCH40(.375)
2 1/2″ IPS(2.875″ O.D.)	18″ IPS (18.000″ O.D.)
Seamless Pipes, SCH 10, 40, 80, 160, XXH	Pipes, SCH-40 (.375)
3″ IPS( 3.500″ O.D.)
Seamless Pipes, SCH 5, 10, 40, 80, 160, XXH

Benefits of Duplex Steel Pipes

Genuine Material & Cost-Effective: Buy directly from the manufacturer for authentic, competitively priced pipes with fast global delivery.
Enhanced Strength: Offers double the design strength of austenitic and ferritic steels for superior performance.
Machining & Forming: More challenging to machine but highly durable and strong.
Weldability: Can be welded with care, especially in thicker materials, for reliable joints.
Temperature Tolerance: Effective up to 300°C, with excellent toughness down to -80°C (not suitable for cryogenic use).
Corrosion Resistance: Tailored corrosion resistance for various applications.
Stress Corrosion Cracking: Outstanding resistance, ideal for demanding environments.

Applications of Duplex Pipes

Offshore Oil Drilling: Withstands harsh offshore conditions.
Petrochemical Plants: Essential for various processes.
DSS Pipes: Ideal for oil and gas production and transport.
Condensers: Efficient in heat exchange systems.
Power Generation: Durable and resistant in power plants.
Gas Processing: Handles and processes gases effectively.
Heat Exchangers: Efficient heat transfer between fluids.
Structural Components: Provides strength for structural uses.
Cooling Pipes: Manages thermal systems efficiently.
Sea Water Equipment: Corrosion-resistant for marine applications.
Chemical & Pharmaceutical Equipment: Reliable and resistant in manufacturing.

We Supply Our Duplex Steel Pipe & Tubes to various countries like Mexico, Ireland, Oman, India, Russia, Algeria, Turkey, Bahrain, China, Trinidad & Tobago, Austria, Qatar, Ecuador, United Arab Emirates, Poland, Jordan, Libya, Philippines, Hungary, Nigeria, Bulgaria, Indonesia, Chile, Macau, Colombia, Croatia, Germany, Ghana, Argentina, South Africa, Greece, Switzerland, Hong Kong, Kuwait, France, Italy, Costa Rica, Kenya, Namibia, Azerbaijan, Japan, Venezuela, Morocco, Brazil, New Zealand, United Kingdom, Canada, Mexico, Bolivia, Romania, Iraq, Tibet, Angola, Chile, Estonia, Puerto Rico, South Korea, Nigeria, Finland, Tunisia, Slovakia, Vietnam, Egypt, Lithuania, Czech Republic, Bhutan, Peru, Zimbabwe, Ukraine, Australia, Gabon, Taiwan, Sri Lanka, Thailand, Lebanon, Kazakhstan, Belarus, Gambia, Norway, Netherlands, Bangladesh, Sweden, Pakistan, Serbia, Iran, Iran, Nepal, Spain, Poland, Yemen, United States, Singapore, Malaysia, Israel, Mongolia, Belgium, Afghanistan, Denmark, Portugal, Saudi Arabia.

We Supply Our Duplex Steel Pipe & Tubes to various cities like Toronto, Al Khobar, Chandigarh, Haryana, Perth, Algiers, Ahvaz, Ulsan, Moscow, Istanbul, Howrah, Singapore, Ho Chi Minh City, Port-of-Spain, London, Rajkot, New York, New Delhi, Nagpur, Kuwait City, Karachi, Surat, Ernakulam, Gimhae-si, Granada, Kanpur, Kolkata, Lahore, Madrid, Visakhapatnam, Secunderabad, Bangkok, Mumbai, Coimbatore, Bogota, Milan, Tehran, Ranchi, Pimpri-Chinchwad, Montreal, Colombo, Bhopal, Seoul, Edmonton, Aberdeen, Caracas, Busan, Brisbane, Sydney, Calgary, Sharjah, Rio de Janeiro, Chennai, Chiyoda, Geoje-si, Jakarta, Thiruvananthapuram, Courbevoie, Riyadh, Indore, Jeddah, Hyderabad, Kuala Lumpur, Baroda, Ankara, Mexico City, Dubai, Gurgaon, Vung Tau, Lagos, Al Jubail, Melbourne, Los Angeles, Petaling Jaya, Bengaluru, Atyrau, Jamshedpur, Santiago, Hanoi, Thane, Pune, Doha, Faridabad, Vadodara, La Victoria, Muscat, Ludhiana, Jaipur, Navi Mumbai, Houston, Ahmedabad, Dammam, Manama, Nashik, Cairo, Abu Dhabi, Hong Kong, Dallas, Noida.

New York City, Los Angeles, Chicago, Houston, Phoenix, Philadelphia, San Antonio, San Diego, Dallas, San Jose, Austin, Jacksonville, Fort Worth, Columbus, Charlotte, San Francisco, Indianapolis, Seattle, Denver, Washington, Boston, El Paso, Nashville, Detroit, Oklahoma City, Portland, Las Vegas, Memphis, Louisville, Baltimore, Milwaukee, Albuquerque, Tucson, Fresno, Mesa, Sacramento, Atlanta, Kansas City, Colorado Springs, Omaha, Raleigh, Miami, Long Beach, Virginia Beach, Oakland, Minneapolis, Tulsa, Tampa, Arlington, New Orleans, Wichita, Bakersfield, Cleveland, Aurora, Anaheim, Honolulu, Santa Ana, Riverside, Corpus Christi, Lexington, Henderson, Stockton, Saint Paul, Cincinnati, St. Louis, Pittsburgh, Greensboro, Lincoln, Anchorage, Plano, Orlando, Irvine, Newark, Durham, Chula Vista, Toledo, Fort Wayne, St. Petersburg, Laredo, Jersey City, Chandler, Madison, Lubbock, Scottsdale, Reno, Buffalo, Gilbert, Glendale, North Las Vegas, Winston-Salem, Chesapeake, Norfolk, Fremont, Garland, Irving, Hialeah, Richmond, Boise, Spokane, Baton Rouge, Tacoma, San Bernardino, Modesto, Fontana, Des Moines, Moreno Valley, Santa Clarita, Fayetteville, Birmingham, Oxnard, Rochester, Port St. Lucie, Grand Rapids, Huntsville, Salt Lake City, Frisco, Yonkers, Amarillo, Glendale, Huntington Beach, McKinney, Montgomery, Augusta, Aurora, Akron, Little Rock, Tempe, Columbus, Overland Park, Grand Prairie, Tallahassee, Cape Coral, Mobile, Knoxville, Shreveport, Worcester, Ontario, Vancouver, Sioux Falls, Chattanooga, Brownsville, Fort Lauderdale, Providence, Newport News, Rancho Cucamonga, Santa Rosa, Peoria, Oceanside, Elk Grove, Salem, Pembroke Pines, Eugene, Garden Grove, Cary.

FAQs

What is a duplex tube?

A duplex tube combines ferritic and austenitic stainless steels for high strength, excellent corrosion resistance, and toughness, making it ideal for harsh environments like the oil and gas industry.

What grade is used for duplex steel pipes?

Common grades for duplex steel pipes include UNS S31803, S32205, and S32750.

What are half duplex and full duplex pipes?

Half duplex pipes allow flow in one direction at a time, while full duplex pipes enable simultaneous flow in both directions.

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