Duplex Pipes

 

We can produce and deliver nearly any duplex material requirement in pipe, tube or fittings. While Duplex 2205 is the most common duplex product we supply, we can also deliver Duplex 2304 and Duplex 2207 with reduced lead times as these alloys are stocked. Alloy 2205 (UNS S32305/S31803) is a 22% chromium, 3% molybdenum, 5-6% nickel, nitrogen alloyed duplex stainless steel pipe with high general, localized, and stress corrosion resistance properties in addition to high strength and excellent impact toughness.

Alloy 2205 provides pitting and crevice corrosion resistance superior to 316L or317L austenitic stainless steel tube in almost all corrosive media. It also has high corrosion and erosion fatigue properties as well as lower thermal expansion and higher thermal conductivity than austenitic.

Standard: ASTM/ASME A789/SA789, A790/SA790

Steel Grade: UNS S32750, S31803, S32760 etc.

Applications:

General service, fluid transportation, pressure, high and low temperature, structural, heat exchanger, oil and gas service, ornamental, chemical and fertile

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Duplex stainless steel 2205 has below capability:

High intensity and good impact toughness

It can bear stress corrosion well

Good ability to avoid patch and crack

Low heat expand modulus and better heat transmit

High pressure work

Weldable

Delivery requirment:

Marking: SunnySteel, material grade, standard, specification, heat no.

Surface Treatment: Bright annealed, polished outside and inside surface.

Package: Each pipe in a PVC bag and caps on both ends then bundled in wood case, (option: Bundle with knitted plastic bag/stee crate. )

Mill test certificate: according to  EN 10204 3.2

Inspection: Third party inspection, or by clints

Chemical Composition

Grade	Chemical Composition
	C (max)	Si (max)	Mn (max)	P (max)	S (max)	Cr	Ni	Mo	N	Cu
S32750	0.030	0.8	1.2	0.030	0.015	24.0-26.0	6.8-8.0	3.0-5.0	0.24-0.32	0.5 max
S13803	0.030	1.0	2.0	0.030	0.020	21.0-23.0	4.50-6.50	2.50-3.50	0.08-0.20

Physical Propertie

Grade	Physical Propertie
	Y.S. MPa (min)	T.S. MPa (min)	Elongation %	Hardness HRC
S32750	550	800	15	31
S13803	450	620	25	31

Size range for duplex pipes

W.T.	1.0	1.2	1.5	1.65	2.0	2.11	2.5	3.0	3.5	4.0	4.5	5.0	5.5	6.0	6.5	7.0	7.5	8.0	8.5	9.0
15
16
18
19.05
22
25.4
31.8
35
38.1
42
45
50.8
55
60
65
70
75
80
90
101.6
114.3
121
127
133
141.3
159
168.3

Note: For sizes other than given, please check with our office for further confirmation.