Duplex Pipes

Chintamani Stainless Inc is ISO 9001:2008 certified manufacturer, supplier and exporter of Duplex Pipes & Tubes in India and worldwide .Duplex 2205 pipe has multiple uses, including oil and gas exploration and transportation, power generation, and offshore oil drilling companies. Duplex 2205 Stainless Pipe & Condensers Tube, Petrochemicals, Gas Processing, Heat exchangers, Pipe for Sea Water Equipment,Pharmaceutical Equipment, Cooling pipe,Structural and mechanical components, Chemical Equipment. Duplex 2205 tubes are used in boilers and heat exchangers, as well as oil tubes, fluid tubes, and gas tubes.
As the 2205 duplex stainless tubing component is subjected to temperatures over 572°F, particularly though the exposure is brief, the duplex 2205 seamless tube becomes embrittled. As a result, 2205 duplex pipe can not be used at temperatures above 572°F. Due to higher chromium, molybdenum, and nitrogen contents, 2205 duplex stainless steel tubes exhibit superior corrosion resistance properties in most settings as compared to the more commonly used austenitic stainless steel grades 316 and 316L.
The corrosion-resistant duplex stainless steel S31803 is used to make Sa789 S31803 Coiled Tubings. Control phase, chemical injection line, electrical line, multi-line flat pack, hydraulic line, tube encapsulated conductor, intelligent well completions, and capillary tubing are several of the applications. Sa789 S32205 boiler tubes are those with the ability to withstand extreme pressure and temperature.

Alloy 2205 is a second-generation, nitrogen-alloyed duplex stainless steel (ferritic-austenitic). It offers an excellent combination of both strength and corrosion resistance over a wide range of applications. The approximate 50/50 ferrite-austenite structure provides excellent chloride pitting and stress corrosion cracking resistance, with roughly twice the yield strength of the standard austenitic stainless grades.

The high chromium and molybdenum content, coupled with the nitrogen addition in 2205, provides general corrosion, pitting, and crevice corrosion resistance superior to 316L and 317L.

The UNS S31803 grade stainless steel has undergone a number of modifications resulting in UNS S32205, and was endorsed in the year 1996. This grade offers higher resistance to corrosion.

2205 demonstrates superior erosion-corrosion resistance when compared to 316 stainless steel. It is not subject to intergranular corrosion in the as-welded condition. 2205 may be successfully machined by conventional methods.

The (UNS S32205) grade is a restricted-chemistry version which maintains chromium, molybdenum and nitrogen at higher levels than the (UNS S31803) composition.

Product Range

Specifications: ASTM A/ASME SA213/A249/A269/A312/A358 CL. I to V ASTM A789/A790
Sizes (Seamless): 1/2" NB - 24" NB
Sizes (ERW): 1/2" NB - 24" NB
Sizes (EFW): 6" NB - 100" NB

Wall Thickness available:

Schedule 5S - Schedule XXS (heavier on request)

Other Materials Testing:

NACE MR0175, H2 SERVICE, OXYGEN SERVICE, CRYO SERVICE, etc.

Dimensions:

All Pipes is manufactured and inspected/tested to the relevant standards including ASTM, ASME and API etc.

2205 is the most widely used duplex (ferritic/austenitic) stainless steel grade. It finds applications due to both excellent corrosion resistance and high strength. The standard duplex S31803 composition has over the years been refined by many steel suppliers, and the resulting restricted composition range was endorsed as UNS S32205 in 1996. Duplex S32205 gives better guaranteed corrosion resistance, but for much of the Duplex S31803 currently produced also complies with Duplex S32205. 2205 is not generally suitable for use at temperatures above 300ºC as it suffers from precipitation of brittle micro-constituents, nor below -50ºC because of its ductile-to-brittle-transition.

"Duplex” is a stainless steel family that is neither fully austenitic, such as 304 stainless, nor ferritic such as 430 stainless steel. The 2205 duplex stainless steel structure consists of austenite pools surrounded by a continuous ferrite phase. In the annealed condition, 2205 has approximately 40-50% ferrite. The 2205 Duplex is mostly referred to as the work horse grade and is the most widely used grade in the duplex family of stainless steels.

The benefit of a duplex structure is that the favorable qualities of a ferritic alloy are combined with those of an austenitic alloy that features corrosion resistance and ease of fabrication. Usage of 2205 Duplex stainless steel should be limited to temperatures below 600° F. Extended elevated temperature exposure can embrittle 2205 stainless.

Grade Specification Comparison of UNS S32205 Duplex Stainless Steel Pipe

Table 4 provides the grade comparison for 2205 stainless steels. The values are a comparison of functionally similar materials. Exact equivalents may be obtained from the original specifications.

Table 4 - Grade specification comparisons for 2205 grade stainless steels

Possible Alternative Grades of UNS S32750 Duplex Stainless Steel Pipe

Given below is a list of possible alternative grades, which may be chosen in place of 2205.

Table 5 - Grade specification comparisons for 2205 grade stainless steels

Duplex Applications of UNS S3205 Duplex Stainless Steel Pipe

Chemical processing, transport and storage
Oil and Gas exploration and processing equipment,
Marine and other high chloride environments,
Pulp and paper digesters, liquor tanks and paper machines.

Duplex corrosion Resistance of UNS S32205 Duplex Stainless Steel Pipe
Excellent general corrosion resistance; superior to Grade 316 in most environments. Excellent resistance to localized corrosion including intergranular, pitting and crevice corrosion; the CPT of 2205 is generally at least 35ºC. The grade is also resistant to chloride stress corrosion cracking (SCC) at temperatures of up to about 150ºC. Grade 2205 will often perform well in environments which cause premature failure of austenitic grades. It has better resistance to sea water then Grade 316.

Duplex Heat Resistance of UNS S32205 Duplex Stainless Steel Pipe
Although 2205 has good high temperature oxidation resistance, this grade - like other duplex stainless steels - suffers from embrittlement if held for even short times at temperatures above 300ºC. If embrittled, this can only be rectified by a full solution annealing treatment. Duplex stainless steels are almost never used above 300ºC.

Duplex Heat Treatment of UNS S32205 Duplex Stainless Steel Pipe Solution treatment (annealing) - heat to 1020ºC-1100ºC and cool rapidly. This grade cannot be hardened by thermal treatment, but does work harden.

UNS S32205 Duplex Stainless Steel Pipe and Tube Packing

UNS S32205 Duplex Stainless Steel Pipes and Tubes is sleeved into plastic bag individually, pieces wrapped with water-proof material, bundled with nylon rope. Clear labels are tagged on the outside of the package for easy identification of the quantity and product I.D. Great care is taken during operation and transportation. UNS S322205 Duplex Stainless Steel Pipe packing will be according to international standard in bundles strapped by strips then into containers to avoid any damage.

Specification

ASTM Specification	ASTM A928 / ASME SA 928 ASTM A999 / ASME SA 999 ASTM A790 / ASME SA 790 astm a790 duplex 2205, SA 789 alloy 2205, a790 gr 2205
Standard	JIS, TOCT, GB, AMS, EN, ASTM, AISI, SAE, ASME, DS, NF, DTD, DIN
International Specifications	ISO 6207, BS3 3074NA15, VdTüV 412 & 434, DIN 17459
UNS S32205 Welded Pipe Size	5.0 - 1219.2 mm
Alloy 2205 Seamless Pipe Size	4 to 219mm W. T.: 0.5 to 20mm
Duplex 2205 EFW Pipe size	5.0 - 1219.2 mm
2205 duplex stainless steel Pipe Schedule	SCH5, SCH140, SCH80, XS, SCH10, SCH10S, SCH80, XXS, SCH120, SCH60, SCH30, STD, SCH20, SCH40S, SCH160, SCH40
Duplex 2205 Pipe & Tube Outer Diameter	Sizes up to 12” NB, 6.00 mm OD up to 250 mm OD
Swg & Bwg	10 Swg., 12 Swg., 14 Swg., 16 Swg., 18 Swg., 20 Swg.
2205 duplex stainless steel tubing wall thickness	0.020" –0.220" (special wall thicknesses available)
Alloy 2205 Seamless Tube Size	3.35 mm OD To 101.6 mm OD, 15 NB to 150 NB IN
Duplex 2205 Welded Tube Size	6.35 mm OD To 152 mm OD
Finish	BA (Bright & Annealed), Polished, AP (Annealed & Pickled), NO.1, MF, 2B, NO.4, HL, BA, Mirror finish, 8K etc
Length	Single Random, Standard & Cut length , Double Random Pipe
Form	Duplex 2205 Pipe are available in form of Square, Round, Rectangular, Hollow, Coiled, Hydraulic, Straight Pipes, Pan Cake Coils, “U” Shape etc.
End of WERKSTOFF NR. 1.4462 Pipe	Beveled End, Plain End, Screwed ends, Treaded Pipe
Type of UNS S32205 Pipe	Duplex 2205 ERW/ Seamless / Welded / EFW / CDW / Fabricated /CEW/ DOM Pipe
Application of Duplex 2205 Pipe	Oil Tube, Boiler and Heatexchanger, Gas Tube, Fluid Tube
Marking on ASTM A790 Duplex 2205 Pipe	All ASTM A790 Duplex 2205 Pipes are marked as follows: Grade, Standard, Thickness, OD, Heat No. (Or according to the customer’s request.), Length
Specialize in	Duplex 2205 Heat Exchanger & Condenser Tubes Large Diameter Duplex 2205 Pipe & Tube Duplex 2205 Capillary Tube & Other Odd Size
Value Added Service	Polish (Electro & Commercial) Annealed & Pickled Bending, Draw & Expansion as per required Size & Length, Machining Etc.
manufacturing Technique of Duplex 2205 Pipe	hot drawn, Cold drawn, solid solution, bright annealed, hot extruding
Test Certificate of Alloy 2205 Pipe and tube	Laboratory Test Certificate from Govt. Approved Lab. Manufacturer Test Certificate Under Third Party Inspection
Our stockyard of UNS S31803 Pipe	Pimpri-Chinchwad, Abu Dhabi, Port-of-Spain, New Delhi, Gimhae-si, Courbevoie, Riyadh, Calgary, Ahmedabad, Ernakulam, Bangalore, Sydney, Muscat, Lagos, Santiago, Karachi, Caracas, India, Montreal, Nagpur,Indore, Kolkata, Mumbai, Noida, Kanpur, Tau, Gurgaon, Ankara, Perth, Bogota, Ludhiana, Tehran, Mexico, Janeiro, Kuwait, Jamshedpur, Gujarat, Vadodara, Melbourne, Chennai, Rajkot, Coimbatore, Ranchi, Hyderabad, Bengaluru, Baroda, London, Ahvaz, Howrah, Dammam, Khobar, Surat, Manama, Thiruvananthapuram, Istanbul,
Material Test Certificates (MTC)	Third Party Inspection Report, Fumigation Certificates 100% Radiography Test Report, Heat Treatment Charts, Raw Materials Certificate Duplex 2205 Pipe HS Code Commercial Invoice, Form A for Generalized System of Preferences (GSP) Material Test Certificates (MTC) as per EN 10204/3.1B, EN 10204 3.1 and EN 10204 3.2
Duplex 2205 Pipe Dimension ANSI/ ASME B36.10, B36.19, B2.1 We can also thread, cut and groove UNS S32205 Pipe to meet your specifications.

Equivalent of ASTM A815 DSS Pipe Elbow

PIPE STANDARD	WERKSTOFF NR.	UNS
Duplex 2205 Pipe	1.4462 / 1.4462	S31803 / S32205

CHEMICAL COMPOSITION

C	N	P	Si	Mn	Mo	Fe	Cr	S	Ni
1.0	0.03	0.02	2.0	3.0 - 3.5	22.0 - 23.0	0.03	4.5 - 6.5	0.14 - 0.2	Bal

MECHANICAL PROPERTIES

Pipe Density	Pipe Melting Point	Yield Strength (0.2%Offset)	2205 Duplex SS Pipe Tensile Strength	Elongation
7.8 g/cm3	1350 °C (2460 °F)	Psi - 80000 , MPa - 550	Psi - 116000 , MPa - 800	15 %

Size Range Of ASTM A790 Duplex 2205 Pipe

UNS S32205 Seamless Pipes are supplied according to ANSI/ ASME B36.19.
OD = Duplex 2205 Pipe outside diameter
WT = Duplex 2205 Pipe wall thickness

ASTM A790 Duplex 2205 Pipe OD mm	Pipe WT mm	in.	Sch	Kg/m
13.72	1.65	1/4	10S	0.50
13.72	2.24	1/4	40S	0.64
13.72	3.02	1/4	80S	0.81
17.15	1.65	3/8	10S	0.64
17.15	2.31	3/8	40S	0.86
17.15	3.20	3/8	80S	1.12
21.34	2.11	1/2	10S	1.02
21.34	2.77	1/2	40S	1.29
21.34	3.73	1/2	80S	1.65
26.67	2.11	3/4	10S	1.30
26.67	2.87	3/4	40S	1.71
26.67	3.91	3/4	80S	2.23
33.40	2.77	1	10S	2.13
33.40	3.38	1	40S	2.54
33.40	4.55	1	80S	3.29
33.40	6.352)	1	160	4.30
42.16	2.77	1¼	10S	2.73
42.16	3.56	1¼	40S	3.44
42.16	4.85	1¼	80S	4.53
42.16	6.352)	1¼	160	5.69
48.26	2.77	1½	10S	3.16
48.26	3.68	1½	40S	4.11
48.26	5.08	1½	80S	5.49
60.33	2.77	2	10S	3.99
60.33	3.91	2	40S	5.52
60.33	5.54	2	80S	7.60
60.33	8.742)	2	160	11.29
73.03	3.05	2½	10S	5.35
73.03	5.16	2½	40S	8.77
73.03	7.01	2½	80S	11.59
88.90	3.05	3	10S	6.56
88.90	5.49	3	40S	11.47
88.90	7.62	3	80S	15.51
88.90	11.132)	3	160	21.67
101.60	3.05	3½	10S	7.53
101.60	5.74	3½	40S	13.78
101.60	8.08	3½	80S	18.92
114.30	3.05	4	10S	8.50
114.30	6.02	4	40S	16.32
114.30	8.56	4	80S	22.67
114.30	13.492)	4	160	34.05
141.30	6.55	5	40S	22.10
141.30	9.53	5	80S	31.44
141.30	15.882)	5	160	49.87
168.28	3.4	6	10S	14.04
168.28	7.11	6	40S	28.69
168.28	10.97	6	80S	43.21
168.28	14.27	6	120	54.75
168.28	18.262)	6	160	68.59
219.08	8.18	8	40S	43.20
219.08	12.7	8	80S	65.63
219.08	18.23	8	120	91.30
219.08	23.012)	8	160	112.97

General characteristics

Steel designations				Performance				Typical chemical composition, % by mass
name	EN	ASTM Type	UNS	PRE	A1) %	Rp0.2 MPa	Grade family	C	Cr	Ni	Mo	N
2205	1.4462	2205	S32205	35	20	500	D	0.02	22.4	5.7	3.1	0.17
2507	1.4410	2507	S32750	43	20	550	D	0.02	25.0	7.0	4.0	0.27

2205 stainless steel grades	Industry Specifications	UNS
Duplex 2205 2205 (EN 1.4462/UNS S32205 & S31803) The most popular duplex product on the market. Offers very good resistance to uniform and localized corrosion and stress corrosion cracking in combination with high mechanical strength.	• Cargo tanks in chemical tankers • Pulp and paper industry applications such as digesters and process tanks • Oil and gas industry, typically tubular products, flanges, fittings and valves • Structural components in bridges	• Cold rolled coil and sheet • Hot rolled coil and sheet • Quarto plate • Bar • Wire rod • Semi-finished (bloom, billet, ingot & slab)
Duplex 2507 2507 (EN 1.4410/UNS S32750) A super duplex product with higher corrosion resistance and mechanical strength than Forta DX 2205. Often used in extremely corrosive environments.	• Desalination plants • Industrial piping • Scrubbers • Oil and gas industry, typically tubular products, flanges,fittings and valves • Deep-sea pipelines	• Cold rolled coil and sheet • Hot rolled coil and sheet • Quarto plate • Bar • Wire rod • Semi-finished (bloom, billet, ingot & slab)
Duplex 32760 100 (EN 1.4501/UNS S32760) A super duplex product with higher corrosion resistance and mechanical strength than Forta DX 2205. Often used in extremely corrosive environments.	• Desalination plants • Industrial piping • Scrubbers • Oil and gas industry, typically tubular products, flanges, fittings and valves • Deep-sea pipelines	• Cold rolled coil and sheet • Hot rolled coil and sheet • Quarto plate • Bar • Wire rod • Semi-finished (bloom, billet, ingot & slab)

Performance

Elongation vs. corrosion resistance.

Elongation vs. Corrosion resistance

Strength vs. Corrosion resistance

Elongation vs. Corrosion resistance

Duplex stainless steels, known for their high chromium content, provide excellent corrosion resistance, particularly in uniform corrosion environments with rates below 0.1 mm/year. Forta DX 2205 shows superior resistance to chloride-contaminated sulfuric acid compared to traditional stainless steels like Supra 316L/4404, approaching the performance of Ultra 904L. In dilute hydrochloric acid, Forta SDX 2507 and similar high-alloyed duplex steels are suitable, though localized corrosion risks exist around crevices even within safe usage limits.

PRE values for Forta Duplex grades and some austenitic grades

Steel designations				PRE
name	EN	ASTM Type	UNS
2205	1.4462	2205	S32205	35
2507	1.4410	2507	S32750	43

Results from stress corrosion cracking immersion tests in chloride solutions

name	ASTM G123		ASTM G36
	25% NaCl, pH 1.5, 106°C (b.p.), 1,000 h	40% CaCl2, 100°C, 500 h	45% MgCl2, 155°C (b.p.), 24 h
	U-bend samples	4-PB samples (90% of Rp0.2)	U-bend samples
2205	No SCC	No SCC	SCC
2507	No SCC	No SCC	SCC

Mechanical properties according to EN 10088 and EN 10028

	EN	ASTM	Product form	Yield strength	Tensile	Elongation	Elongation
name		UNS		Rp0.2[MPa]	strength	A[%]	A80[%]
				Rm[MPa]
2205	1.4462	S32205	Cold rolled coil (C)	500	700–950	20	20
			Hot rolled coil (H)	460	700–950	25	25
			Quarto plate (P)	460	640–840	25	25
			Wire rod 1)	510	750	35	–
			Bar	450	650–880	25	–
2507	1.4410	S32750	Cold rolled coil (C)	550	750–1000	20	20
			Hot rolled coil (H)	530	750–1000	20	20
			Quarto plate (P)	530	730–930	20	20
			Bar	530	730–930	25	–
	1.4510	S32760	Cold rolled coil (C)	550	750–1000	20	20
			Hot rolled coil (H)	530	750–1000	25	25
			Quarto plate (P)	530	730–930	25	25

Mechanical properties according to ASTM A240

	EN	ASTM	Product form	Yield	Yield	Tensile	Tensile	Elongation
name		UNS		strength	strength	strength	strength	A50[%]
				Rp0.2[MPa]	Rp0.2 [ksi]	Rm [MPa]	Rm [ksi]
2205	1.4462	S32205	Plate, sheet and strip	450	65	655	95	25
			Wire rod 1)	510	74	752	109	–
2507	1.4410	S32750	Plate, sheet and strip	550	80	795	116	15
100	1.4501	S32760	Plate, sheet and strip	550	80	750	108	25

Mechanical properties at elevated temperatures, minimum yield strength according to EN 10028-7

name	Strength		100°C	150°C	200°C	250°C
2205	Yield strength	Rp0.2 [MPa]	360	335	315	300
	Tensile strength	Rm [MPa]	590	570	550	540
2507	Tensile strength	Rm [MPa]	680	660	640	630

Physical properties

Metric values according to EN 10088-1

name	EN	ASTM Type	UNS	Density [kg/dm3]	Modulus of elasticity at 20°C [GPa]	Coefficient of thermal expansion 20–100°C [10-6/K]	Thermal conductivity at 20°C [W/(m x K)]	Thermal capacity at 20°C [J/(kg x K)]	Electrical resistivity at 20°C [Ω x mm2/m]
2205	1.4462	2205	S32205	7.8	200	13.0	15	500	0.8
2507	1.4410	2507	S32750	7.8	200	13.0	15	500	0.8
100	1.4410	-	S32760	7.8	200	13.0	15	500	0.8

Imperial values converted from Table 10

name	Density [lbm/in3]	Modulus of elasticity [psi]	Coefficient of thermal expansion 68–212°F [μin / (in x °F)]	Thermal conductivity [Btu/(hr x ft x °F)]	Thermal capacity [Btu/(lbm x °F)]	Electrical resistivity [μΩ x in]
2205	0.282	29 x 106	7.2	8.7	0.119	31.50
2507	0.282	29 x 106	7.2	8.7	0.119	31.50

Fabrication

Duplex stainless steel is suitable for all forming processes used for stainless steel. The high yield strength compared to austenitic and ferritic stainless steel can however give differences in forming behavior. Depending on the chosen forming technique there could be consequences, such as increased springback. This point is particularly relevant to the forming of any high strength steel. Moreover, an excellent interplay between high yield strength, work hardening rate and elongation promote the duplex grades for light weight and cost-efficient applications with complex shapes. The impact of the high strength varies for different forming techniques. Common for all is that the estimated forming forces will be higher than for the corresponding austenitic and ferritic stainless steel grades. This effect will usually be lower than expected from just the increase in strength since the choice of duplex stainless steel is often associated with gauge reduction. It is important to consider that duplex stainless steel may also be more demanding on the tools and on the lubricant. This should also be noted when looking to down gauge.

Welding consumables

name	EN	ASTM Type	UNS	Consumable ISO designation
2507	1.4462	2205	S32205	22 9 3 NL
2507	1.4410	2507	S32750	25 9 4 NL