Duplex pipe supplier in India

What is a duplex pipe?

These pipes use a special alloy comprising iron, chromium, and nickel. a duplex pipe has two grades – ferritic and austenitic – for a unique microstructure.The most common composition is 22% chromium, 5% nickel, and 5% molybdenum. A duplex stainless steel pipe shows high strength, good welding performance, and superior corrosion resistance when exposed to chlorides and sulphides. It also exhibits excellent heat conductivity.

Duplex stainless steel seamless pipes manufacturer in Mumbai

How is duplex seamless pipes manufactured?

The manufacturing process involves multiple steps, starting with melting steel in an electric arc furnace. This molten steel gets shifted to a converter (aod, or argon oxygen decarburization). The composition gets settled during this step by adding the alloying elements and eliminating the gases. The last step is casting into the desired shape, like a duplex seamless pipes. Manufacturers may perform further steps to meet client requirements, for instance, solution annealing, peeling, and pickling.

Specification of duplex pipe

Specification	Size	Thickness
ASTM A 790 ASME SA 790	14mm - 250mm	0.3mm to 50 mm
Schedules	End	Types
SCH20, SCH30, SCH40, SCH80	Plain, treaded, beveled	Seamless pipes, welded pipes, ERW pipes, square pipes

A well-known supplier Manifest Alloys offers a wide range of duplex stainless steel pipe in all the required forms and sizes

For what is a duplex welded pipe utilized?

These pipes are most frequent in heavy industries due to their strength and corrosion resistance. a DSS welded pipe is standard in the oil and gas sectors, chemical processing, and petrochemical industries. Its corrosion resistance helps it work dependably in wastewater treatment plants and seawater applications. Paper and nuclear plants and bridge construction projects also use these pipes.

Types of duplex steel round pipe

For quality assurance, we offer NDT testing for dss pipe and sa790 pipe, as well as a comparison of the two

What is the difference between a DSS pipe?

A stainless steel pipe has a minimum of 10% chromium in its composition. It is manufactured in ferritic (magnetic) and austenitic (non-magnetic) grades. In contrast, DSS pipes comprise ferritic and austenitic grades in their microstructure (50-50%). They display desirable properties like high strength, tolerance to stress corrosion cracking, and suitability for temperatures up to -50°c or lower.

Chemical composition of DSS welded pipe

Mo	C	Mn	Cr	Ni	Si	P	S	N	Fe
3.00-3.50	.030 Max	2.00 Max	22.0-23.0	4.50-6.50	1.00 Max	.030 Max	.020 Max	0.14-0.20	Balance

We provide a broad selection of products in high strength duplex welded pipe and astm a790 pipe grades

What is a schedule chart and the price of a duplex pipe?

The schedule chart shows the wall thickness for the corresponding pressure and temperature. It will determine the inside diameter of the pipe. DSS round pipes can cost between rs. 500 to rs. 600 per kilogram. The price is less than austenitic stainless steel grades due to the lower nickel and molybdenum content.

Mechanical properties of duplex ERW pipes

Grade	% Elongation	YS (MPa)	Hardness(BHN)	UTS (MPa)
S31803	25 min.	450 min.	293 max.	620 min.

View duplex ss pipe and DSS ERW pipe schedule chart & pipe price

What are the grades and specifications of a duplex pipe?

Buyers can acquire a dss pipe in multiple grades. The common ones are 2205 (22% chromium, 5% nickel, and 3% molybdenum) and 2304 (23% chromium and 4% nickel, no molybdenum). The standard specification is a240 uns s31803 or s32205.

Equivalent grade of duplex seamless pipes

STANDARD	WERKSTOFF NR.	UNS
Duplex	1.4462	S31803 / S32205

Size chart of DSS pipes

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