Duplex Steel Pipes and Tubes manufacturer and Supplier in India

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Table of Content

Specifications of Duplex Steel Pipes and Tubes
Chemical Composition of Duplex Steel Pipes and Tubes
Duplex Steel Pipes and Tubes Mechanical Properties
Equivalent Grades of Duplex Steel Pipes and Tubes
Types of Duplex Steel Pipes and Tubes
Schedule Chart of Duplex Steel Pipes and Tubes
Weight Chart of Duplex Steel Pipes and Tubes
Pressure Rating Chart of Duplex Steel Pipes and Tubes
Applications of Duplex Steel Pipes and Tubes
Duplex Steel Pipes and Tubes Price Chart
Frequently Asked Questions

The duplex steel pipes and tubes are a type of austenitic and ferritic stainless steel material that is commonly used to provide mechanical strength, prevent corrosion, and provide long-term durability in different environments. Also comes in seamless welded, ERW, and fabricated varieties. Duplex steel pipes and tubes are made following various types, such as duplex 2205, super duplex 2507 and other types . They are also manufactured in different standards such as ASTM A790, ASTM A789, ASME SA790 and ASME SA789 to ensure their consistency and smooth working. Their applications include petroleum and gas, petrochemicals, marine, power generation, chemical process industries and desalination plants. Kalpataru Piping is a reliable manufacturer and supplier of Duplex Steel products in various grades, sizes, schedules and sizes in India which provide precise engineering in different grades and sizes, with proper quality control and traceability, and timely delivery all over the world.

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Specifications of Duplex Steel Pipes and Tubes

Parameter	Specification Details
Size	1/2″NB TO 12 “NB IN
Standards	ASTM A790, ASME SA790, ASTM A789, ASME SA789
Grades	UNS S31803, UNS S32205
Length	Single Random, Double Random & Cut Length
Type	Seamless / ERW / Welded / Fabricated
Form	Round, Hydraulic Etc
Schedule	SCH20, SCH30, SCH40, STD, SCH80

Chemical Composition of Duplex Steel Pipes and Tubes

Grade	C ≤	Mn ≤	P ≤	S ≤	Si ≤	Ni	Cr	Mo	N	Cu
S31803 (Duplex)	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 (Duplex)	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 (Super Duplex)*	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

Duplex Steel Pipes and Tubes Mechanical Properties

Grade (UNS)	Tensile Strength, min. ksi [MPa]	Yield Strength, min. ksi [MPa]	Elongation, % (min.)	Hardness, HB (max.)
S31803	90 [620]	65 [450]	25	290
S32750 (Super Duplex)	95 [655]	65 [450]	25	290
S32750	116 [800]	80 [550]	15	300

Equivalent Grades of Duplex Steel Pipes and Tubes

Standard Family Grade	Werkstoff Nr. (W.Nr.)	UNS Number
Lean Duplex 2304	1.4362	UNS S32304
Duplex 2205	1.4462	UNS S31803 / UNS S32205
Super Duplex 2507	1.4410	UNS S32750
Super Duplex Zeron 100	1.4501	UNS S32760

Schedule Chart of Duplex Steel Pipes and Tubes

Nominal Pipe Size (NPS)	Outside Diameter (mm)	SCH 10S (WT / Wt)	SCH 40S / STD (WT / Wt)	SCH 80S / XS (WT / Wt)
1/2″	21.34	2.11 / 1.02	2.77 / 1.29	3.73 / 1.62
3/4″	26.67	2.11 / 1.30	2.87 / 1.71	3.91 / 2.23
1″	33.40	2.77 / 2.13	3.38 / 2.54	4.55 / 3.29
1-1/2″	48.26	2.77 / 3.16	3.68 / 4.12	5.08 / 5.49
2″	60.33	2.77 / 3.99	3.91 / 5.52	5.54 / 7.48
2-1/2″	73.03	3.05 / 5.34	5.16 / 8.77	7.01 / 11.41
3″	88.90	3.05 / 6.56	5.49 / 11.47	7.62 / 15.27
4″	114.30	3.05 / 8.50	6.02 / 16.07	8.56 / 22.32

Weight Chart of Duplex Steel Pipes and Tubes

Nominal Pipe Size (NPS)	Outside Diameter (mm)	SCH 10S Weight (kg/m)	SCH 40S / STD Weight (kg/m)	SCH 80S / XS Weight (kg/m)
1/2″	21.34	1.02	1.29	1.62
3/4″	26.67	1.30	1.71	2.23
1″	33.40	2.13	2.54	3.29
1-1/2″	48.26	3.16	4.12	5.49
2″	60.33	3.99	5.52	7.48
2-1/2″	73.03	5.34	8.77	11.41
3″	88.90	6.56	11.47	15.27
4″	114.30	8.50	16.07	22.32

Pressure Rating Chart of Duplex Steel Pipes and Tubes

Tube O.D. (in.)	0.028″	0.035″	0.049″	0.065″	0.083″	0.095″	0.109″	0.120″
1/8″	7,900	10,100	—	—	—	—	—	—
1/4″	3,700	4,800	7,000	9,500	—	—	—	—
5/16″	—	3,700	5,400	7,300	—	—	—	—
3/8″	—	3,100	4,400	6,100	—	—	—	—
1/2″	—	2,300	3,200	4,400	—	—	—	—
3/4″	—	—	2,200	3,000	4,000	4,600	—	—
1″	—	—	—	2,200	2,900	3,400	3,900	4,300

Duplex Steel Pipes and Tubes Price Chart

Pipe Type	Approximate Price Range (₹/kg)
Duplex Steel Seamless Pipes	₹ 550 – 850
Duplex Steel Welded / ERW Pipes	₹ 450 – 700
Duplex Steel EFW Pipes	₹ 480 – 750

Types of Duplex Steel Pipes and Tubes

EFW Pipes

ERW Pipes & Tubes

Seamless Pipes

Seamless Tubes

Welded Pipes

Welded Tubes

Applications of Duplex Steel Pipes and Tubes

Offshore Oil and Gas Pipelines
Chemical Processing Plants
Petrochemical Industry
Marine and Shipbuilding Industry
Desalination Plants
Power Generation Plants
Heat Exchangers and Condensers

Frequently Asked Questions

What is a Duplex Steel Pipe?

A duplex steel pipe is a stainless steel pipe with a mixed austenitic and ferritic structure, offering high strength and excellent corrosion resistance.

What is a Duplex Stainless Steel Pipe Used For?

Duplex stainless steel pipes are used in oil and gas, chemical processing, marine, desalination, power generation, and offshore industries.

What is a Duplex Steel Tube?

A duplex steel tube is a high-strength stainless steel tube that provides excellent resistance to corrosion, stress corrosion cracking, and high-pressure conditions.

Are Duplex Pipes Heat Treatable?

Duplex pipes are solution annealed during manufacturing, but they cannot be hardened through conventional heat treatment methods.

What Are the Wall Thicknesses of Duplex Stainless Steel Pipes?

Duplex stainless steel pipes are available in various wall thicknesses, including SCH 5, SCH 10, SCH 40, SCH 80, SCH 160, and XXS, depending on the application.

Are Duplex Steel Tubes Magnetic?

Yes, duplex steel tubes are slightly magnetic because they contain a ferritic phase in their microstructure.