Alloy 20 Pipes & Tubes Suppliers & Manufacturers

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Kalpataru Piping is a major manufacturer and distributor of Alloy 20 pipes, offering high-performance Alloy 20 Pipes and Tubes to consumers in India andinternational markets. Our pipes are made of high Alloy 20 (UNS N08020 / Carpenter 20 alloy) and have gained a great reputation in corrosion, acid and hard chemical resistance. As one of the reliable Alloy 20 pipe suppliers, we offer pipes that find applications in the transfer of fluids, process piping, and other vital industrial applications where reliability and durability are paramount considerations.

We manufacture & supply alloy 20 seamless pipes, welded, and ERW pipes in a large variety of:

Diameter of outside and wall thickness.
End finishes and surface finishes.
Classes, length, and forms of pressure.
ASTM / ASME / API standards

Besides pipes and tubes, Kalpataru Piping offers an entire list of Alloy 20 products such as flanges, fittings, fasteners and forged parts. Our Alloy 20 UNS N08020Pipes and Tubes are all subjected to stringent quality control measures & they are provided with full test certificates. Being a top manufacturer of ASTM B729 UNS N08020 alloy 20 pipes, we can also provide customized solutions based on specific requests of the client, specifications, and project specifications. Having ready stock, competitive prices and on-time delivery, we provide high-quality ASTM B473 Alloy 20 pipes and tubes to the industries.

What is Alloy 20?

Alloy 20 is an austenitic alloy that is based on nickel-iron-chromium & it is a high-performance alloy that has been developed to offer superior resistance against acid attacks, particularly sulfuric acid. It is an alloy of copper and molybdenum in controlled amounts that increases resistance to pitting and crevice corrosion in caustic chemical environments. Alloy 20 UNS N08020 is stabilized using niobium (columbium) to reduce the occurrence of precipitation of carbide during welding. Carpenter 20 alloy, or it is also referred to as Carpenter 20 alloy, is a material that has excellent general corrosion resistance and strength at high temperatures.

Manufacturing Process of ASTM B729 / ASTM B462 / ASTM B473 Alloy 20 Pipes

The austenitic steel raw materials are of high quality and are used in the manufacture of alloy 20 Pipes. Most of the major manufacturers of alloy 20 (UNS N08020) pipes stabilize the alloy with niobium to avoid sensitization and intergranular corrosion.

The manufacturing process includes:

Hot or cold working
Controlled heat treatment
Water quenching for metallurgical stability
Stress relieving to enhance performance

Hot forging is performed at the temperature of between 2100 °F to 2250 o C and then water quenching is done. Any heating that is lower than this can have adverse effects on stabilization of alloys. All these pipes & tubes are subjected to rigid quality checks to check dimensional and surface finish and chemical composition according to the ASTM and ASME requirements.

Corrosion Resistance & Mechanical Properties of Alloy 20 UNS N08020 Pipe

Alloy 20 Pipe is recognized by excellent resistance to corrosion and reliable mechanical characteristics that is appropriate in severe conditions of chemical processing. It works very well with sulfuric, phosphoric and nitric acid as it is also very resistant to pitting and crevice corrosion. It also displays an excellent chloride stress corrosion cracking resistance which adds reliability when subjected to demanding applications. Nevertheless, in the cases of very high concentrations of chloride ions, it is preferable to select particular materials and control operating conditions, as the corrosion rates can accelerate.

Specifications & ASTM Standards For Alloy 20 Pipe & Tubes

ASTM B729 / ASTM B462 / ASTM B473 Alloy 20 Pipe Specifications

Pipe Smls	Pipe Welded	Tube Smls	Tube Welded	Sheet/Plate	Bar	Forging	Fitting
B729	B464	B729	B468	B463	B473	B462	B366

Material Grade	Alloy 20 / UNS N08020 / WERKSTOFF NR. 2.4660
Standards	ASTM B729, ASTM B730, ASTM B464, ASTM B468 / ASME SB 729, SB 730, SB 464, SB 468
Manufacturing Type	Seamless, ERW, EFW, Welded, Fabricated
Size (OD)	Tubes: 3.35 mm – 152 mm ODPipes: 1.250″ – 6.000″ (30–150 mm)
Nominal Bore (NB)	Pipes: 15 NB – 150 NB
Wall Thickness	0.020″ – 0.220″ (0.5 – 5.6 mm)Special wall thickness available
Schedule / Gauge	10, 12, 14, 16, 18, 20 SWG / BWG
Dimension Standards	ANSI B36.10, ANSI B36.19M
Length	Single Random, Double Random, Standard & Cut Length
Form	Round, Square, Rectangular, Oval, Coil, Hydraulic, Boiler, U-bent, Hollow, LSAW
End Finish	Plain End, Beveled End, Threaded
Surface Finish	Annealed & Pickled (AP), Bright Annealed (BA), Polished, Mirror Finish (MF), Cold Drawn
Delivery Condition	Annealed & Pickled, Bright Annealed, Polished
Applications	Oil & Gas Tubes, Fluid Pipes, Boilers, Heat Exchangers, Condensers, Chemical Processing
Special Products	Capillary Tubes, Heat Exchanger & Condenser Tubes, Odd Sizes
Value Added Services	Cutting, Threading, Grooving, Drawing, Expansion, Bending, Machining, Electro & Commercial Polishing
Inspection & Testing	Mill Test Certificate, EN 10204 3.1, PMI, Chemical & Mechanical Tests, NDT, NABL Approved Lab Reports
Third Party Inspection	Available
End Protection	Plastic Caps
Packing	Wooden Boxes, Plastic Bags, Steel Strip Bundles, As Required

UNS N08020 Alloy 20 Pipes & Tubes Compositios & Technical Data

Chemical Composition

Grade	C	Mn	Si	S	Cu	Ni	Cr	Fe	Mo	P
Alloy 20	0.07 max	2.00 max	1.00 max	0.035 max	3.00 – 4.00	32.00 – 38.00	19.00 – 21.00	29.85 min*	2.00 – 3.00	0.045 max

Mechanical Properties

Element	Density	Melting Point	Tensile Strength	Yield Strength (0.2%Offset)	Elongation
Alloy 20	8.1 g/cm3	1443 °C (2430 °F)	Psi -80,000, MPa -551	Psi – 35,000, MPa – 241	30 %

Equivalent Grades

STANDARD	UNS	WERKSTOFF NR.	AFNOR	EN	JIS	BS	GOST
Alloy 20	N08020	2.4660	Z2NCUD31-20AZ	NiCr20CuMo	–	–	–

Most Popular Types of Alloy 20 Pipes

Alloy 20 ERW Pipes

Alloy 20 Welded Tubes

Alloy 20 Welded Pipes

Alloy 20 ERW Tubes

Alloy 20 Seamless Pipes

Alloy 20 Seamless Tubes

ASTM B279 Alloy 20 Seamless Tubes Surface Finish

Surface Finish		Internal Surface(ID)		Exterbal Surface(OD)
		Roughness Average(RA)		Roughness Average(RA)
		μ inch	μm	μ inch	μm
EP	Electro Polish	15,10,7,5	0.38,0.25,0.20;0.13	32	0.8
MP	Mechanical Polish	40,32,25,20	1.0,0.8,0.6,0.5	32	0.8
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

ASTM B473 Alloy 20 Tube 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

Alloy 20 Seamless Pipe Size Chart

Supplier of Alloy DIN NR. 2.4660 Tubing in all types including Coiled, Boiler, and Heat Exchanger Tubes

OUT DIAMETER	WALL THICKNESS		LENGTH
NB Sizes (in stock)	1/8” ~ 8”	SCH 5 / SCH 10 / SCH 40 / SCH 80 / SCH 160		Upto 6 Meters
Seamless (Custom Sizes)	5.0mm ~ 203.2mm	As per requirement		Upto 6 Meters
Welded (in Stock + Custom Sizes)	5.0mm ~ 1219.2mm	1.0 ~ 15.0 mm		Upto 6 Meters

ASTM B462 Alloy 20 Pipe Sizes in MM

Designation of Diameter		O/D	Nominal Wall Thickness
Designation of Diameter		DIA	SCH.5S		SCH.5		SCH 10S		SCH.10		SCH.20S		SCH.30		SCH.40S		SCH.40		SCH 60
(A)	(B)	Meter MM	Wall Thk	Weight Kg/Mtr	Wall Thk	Weight Kg/Mtr	Wall Thk	Weight Kg/Mtr	Wall Thk	Weight Kg/Mtr	Wall Thk	Weight Kg/Mtr	Wall Thk	Weight Kg/Mtr	Wall Thk	Weight Kg/Mtr	Wall Thk	Weight Kg/Mtr	Wall Thk	Weight Kg/Mtr
6	1/8	10.3	1	0.23			1.2	0.27			1.5	0.33			1.73	0.37
8	1/4	13.7	1.2	0.37			1.65	0.49			2	0.58			2.24	0.64
10	3/8	17.2	1.2	0.47			1.65	0.63			2	0.74			2.31	0.87
15	1/2	21.3	1.65	0.01	1.65	0.81	2.11	1.02	2.11	1.02	2.5	1.15			2.77	1.29
20	3/4	26.7	1.65	1.03	1.65	1.03	2.11	1.3	2.11	1.3	2.5	1.49			2.87	1.71
25	1	33.4	1.65	1.31	1.65	1.31	2.77	2.13	2.77	2.13	3	2.24			3.38	2.54
32	11/4	24.2	1.65	1.67	1.65	1.67	2.77	2.73	2.77	2.73	3	2.9			3.56	3.44
40	11/2	48.3	1.65	1.93	1.65	1.93	2.77	3.16	2.77	3.16	3	3.35			3.68	4.11
50	2	60.3	1.65	1.93	1.65	2.42	2.77	3.99	2.77	3.99	3.5	4.9			3.91	5.52
65	21/2	73	2.11	3.75	2.11	3.75	3.05	5.34	3.05	5.34	3.5	6			5.16	8.77
80	3	88.9	2.11	4.59	2.11	4.59	3.05	6.56	3.05	6.56	4	8.37			5.49	11.47
90	31/2	101.6	2.11	5.25	2.11	5.25	3.05	7.53	3.05	7.53	4	9.62			5.74	13.78
100	4	114.3	2.11	5.93	2.11	5.93	3.05	8.5	3.05	8.5	4.5	12.18			6.02	6.32
125	5	141.3	2.77	9.61	2.77	9.61	3.4	11.74	3.43	11.74	5	16.8			6.55	2210
150	6	168.3	2.77	11.47	2.77	11.47	3.4	14.04	3.43	14.04	5.5	22.08			7.11	28.69
200	8	219.1	2.77	15	2.77	15	3.76	20.77	3.76	20.27	6.35	33.82	7.04	37.38	8.18	43.2			10.81	53.9
250	10	273.1	3.4	22.95	3.4	22.95	4.19	28.2	4.19	28.2	6.35	42.41	7.8	51.81	9.27	61.22			12.2	82.8
300	12	323.9	3.96	31.72	4.19	33.6	4.57	36.54	4.57	36.54	6.35	50.48	8.38	66.2	9.53	75.01	10.31	80.94	14.27	110.62
350	14	355.6	3.96	34.86			4.78	41.99	6.35	55.53	7.92	68.95	9.53	82.58	9.53	82.58	11.13	96	15.06	128.42
400	16	406.4	4.19	42.2			4.78	48.07	6.35	63.61	7.92	79.03	9.53	94.7	9.53	94.7	12.7	125.2	16.66	162.59
450	18	457.2	4.19	47.46			4.78	54.15	6.35	71.69	7.92	89.1	11.13	124.32	9.53	106.83	14.27	158.27	19.05	209
500	2C	508	4.78	60.23			5.54	69.7	6.35	79.76	9.53	118.93	12.7	157.51	9.53	118.9	15.06	185.89	2062	251.65
550	22	558.8	4.78	65.95			5.54	76.75	6.35	87.84	9.53	131.07	12.7	173.66	9.53	131.07	15.88	216.04	22.23	298.55
600	24	609.6	5.54	83.8			6.35	95.92	6.35	95.92	9.53	143.2	14.27	212.72	9.53	143.2	17.45	258.74	24.59	360.21
650	26	660.4							7.92	129.4	12.7	205.97			9.53	155.32
700	28	711.2							7.92	139.47	12.7	222.13	15.88	276.48	9.53	167.44
750	3C	762	6.35	120.15			7.92	149.55	7.92	149.55	12.7	238.28	15.88	296.68	9.53	179.56
800	32	812.8							7.92	159.62	12.7	254.44	15.88	316.88	9.53	191.69	17.48	348.11
850	34	863.6							7.92	169.64	12.7	270.5	15.88	336.96	9.53	203.74	17.48	370.22
900	36	914.4							7.92	179.77	12.7	286.75	15.88	357.28	9.53	215.93	19.05	427.09

Dimensions of Alloy 20 UNS N08020 Pipes

NB Sizes	Sch 5	Sch 10	Sch 40	Sch 80	Sch 160
1/8″	✓	✓	✓	✓
1/4″	✓	✓	✓	✓
3/8″	✓	✓	✓	✓
1/2″	✓	✓	✓	✓	✓
3/4″	✓	✓	✓	✓	✓
1″	✓	✓	✓	✓	✓
1 1/4″	✓	✓	✓	✓	✓
1 1/2″	✓	✓	✓	✓	✓
2″	✓	✓	✓	✓	✓
2 1/2″	✓	✓	✓	✓	✓
3″	✓	✓	✓	✓	✓
4″	✓	✓	✓	✓	✓
5″	✓	✓	✓	✓
6″	✓	✓	✓	✓

Alloy 20 Pipe Wall Thickness

Outside Diamter, OD (in mm)	Wall Thickness, WT (in mm)
6 – 630	0.5-30
12.7* 12.7 to 300* 300	0.5-30
1020 to 100200	0.5-30
6 to 630	0.5-30
12.7 to 250	0.5-30
16 to 85	0.5-3.0
13 to 85	0.5-2.0
20 to 200	0.5-2.0
220.7 to 1082.0	0.5-2.0
12.5 to 203.2	1.0 – 5
0.28 to 10	0.08 – 1.2
6 to 430	0.8 – 30

ASTM B279 UNS N8020 Alloy 20 Pipe Testing

Comprehensive quality checks to ensure strength, reliability, and corrosion resistance in demanding service conditions.

Hardness Test: Checks the necessary mechanical strength and durability of Alloy 20 pipes.
Flattening & Flaring Test: Tests ductility and resistance to cracking during forming or installation.
Macro/Micro Check: Checks internal structure, grain flow and weld integrity.
Intergranular Corrosion (IGC) Test: Checks the ability to resist corrosion at grain boundaries in hostile situations.
Pitting Resistance Test: Refers to the capacity to resist localized corrosion in the alloy.
PMI (Positive Material Identification): This verifies the accurate chemical composition and alloy grade prior to shipping.

Alloy 20 Pipes Application Industries

Trusted corrosion-resistant piping solution for critical industrial applications.

Petrochemical Industry: Used for handling acidic and corrosive process fluids.
Chemical Industry: Suitable for reactors, heat exchangers, and process piping.
Oil & Gas Industry: Ideal for corrosive fluid transport and processing systems.
Pulp & Paper Industry: Performs reliably in harsh chemical and bleaching environments.
Power Plant Industry: Applied in boilers, heat exchangers, and auxiliary piping.
Food Processing Industry: Ensures hygiene, purity, and corrosion resistance.
Pharmaceutical Industry: Supports clean and controlled processing conditions.
Energy & Aerospace Industries: Selected for high-performance applications requiring strength and durability.

Marking on Alloy 20 UNS N08020 Pipes

Alloy 20 pipes are clearly and permanently marked so as to be fully traceable and meet industry standards. The markings usually contain the nominal pipe size or nominal bore, wall thickness or schedule, the specification and grade that should be used and the mode of manufacture as seamless or welded. Other markings are the heat number and the name or logo of the manufacturer which can easily be identified by all members of the supply chain.

Alloy 20 Pipes Price

Alloy 20 pipes cost varies according to many factors, which are size, wall thickness, type of manufacturing, standards applicable and testing or inspection required. Pricing is also affected by market conditions, costs of raw materials and order quantity. To have correct and competitive price, one is advised to order a quote depending on your own requirements of the project and the time of delivery.

Pipe Size (NB)	Outside Diameter (mm)	Wall Thickness (mm)	Type	Estimated Price (₹/Kg)
15 NB	21.34	2.0 – 3.0	Seamless	₹2,200 – ₹2,500
20 NB	26.67	2.0 – 3.5	Seamless	₹2,200 – ₹2,500
25 NB	33.4	2.5 – 4.0	Seamless	₹2,150 – ₹2,450
40 NB	48.3	2.5 – 5.0	Seamless	₹2,100 – ₹2,400
50 NB	60.3	3.0 – 5.5	Seamless	₹2,050 – ₹2,350
80 NB	88.9	3.5 – 6.0	Seamless	₹2,050 – ₹2,300
100 NB	114.3	4.0 – 8.0	Seamless	₹2,000 – ₹2,250
150 NB	168.3	5.0 – 10.0	Seamless	₹1,950 – ₹2,200
25–150 NB	33.40 – 168.30	As Required	ERW / Welded	₹1,800 – ₹2,100

Frequently Asked Questions About Alloy 20 Pipes & Tubes

Is Alloy 20 pipe resistant to corrosion?

Yes, Alloy 20 pipes offer excellent resistance to general corrosion, pitting, and crevice corrosion, especially in acidic environments such as sulfuric, phosphoric, and nitric acids.

Can Alloy 20 pipes be used in high-temperature applications?

The Alloy 20 pipes are used at moderately high temperatures and they have good mechanical strength hence they can be applicable in the heat exchanger, boiler, and chemical processing equipment.

What standards are Alloy 20 pipes and tubes manufactured to?

Alloy 20 pipes and tubes are typically produced according to ASTM B729, ASTM B464, ASTM B468 and other similar ASME standards.

Are Alloy 20 pipes available in seamless and welded forms?

Yes, Alloy 20 pipes and tubes are available in seamless, ERW, EFW, welded, and fabricated forms to meet different application needs.

What sizes are available for Alloy 20 pipes and tubes?

Alloy 20 pipes and tubes are available in a wide range of outside diameters, wall thicknesses, and lengths. Custom sizes and cut lengths can also be supplied on request.

Can Alloy 20 pipes be welded easily?

Yes, Alloy 20 is easily weldable. These are aided by niobium to inhibit the occurrence of carbide precipitation and intergranular corrosion during welding.

What tests are performed on Alloy 20 pipes and tubes?

Common tests include hardness testing, flattening and flaring tests, IGC testing, pitting resistance testing, PMI testing, and visual and dimensional inspections.

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