Alloy 20 Pipe

1. Standard: ASTM B729, ASTM B464, ASTM B474
2. OD Sizes: 1/2” - 48”
3. Thickness: SCH5~SCHXXS
4. Type: Seamless / Welded / ERW / EFW / SAW

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Product Introduction

Alloy 20 steel pipe (UNS N08020, EN 2.4660) serves as a nickel-iron-chromium austenitic alloy designed for extreme corrosive environments. Its unique chemical composition and microstructure give it excellent comprehensive performance. The alloy contains 32-38% nickel, 19-21% chromium, 2-3% molybdenum and 3-4% copper. Combined with the synergistic effect of niobium, titanium and other elements, it achieves an ideal balance in corrosion resistance, high temperature resistance and mechanical strength, becoming a key material in the fields of chemical, energy, pharmaceuticals, etc.

ASTM B729, B464, B468 UNS N08020 Pipe Manufacturer, Supplier

HT PIPE is a well-known stockist and exporter. We are a Alloy 20 Pipe material supplier with 15+ export experience. We not only provide pipes, plate, round bars, but also pipe fittings, flanges, etc. Contact us for more information and prices for free.

Features of Alloy 20 Pipe

ASME SB729, SB464, SB468 Alloy 20 Corrosion resistance

Alloy 20 steel pipe performs well in a variety of corrosive environments, especially in strong acid media such as sulfuric acid, phosphoric acid, and nitric acid. The high nickel content allows it to remain stable in high-temperature and high-concentration acid solutions, while the combination of molybdenum and copper effectively resists the corrosion of chloride ions and sulfides.

Nickel Alloy EN 2.4660 Pipe Fabricate and welding

Alloy 20 steel pipe has good hot processing and cold processing properties. The hot processing temperature is controlled at 1110-1140℃, and the required profiles can be formed by forging or rolling; cold processing requires a lower cutting speed to reduce the impact of the hardened layer. In terms of welding, the alloy supports a variety of processes (such as argon arc welding and resistance welding).

UNS N08020 Pipe Heat treatment

The performance optimization of Alloy 20 steel pipe is highly dependent on the heat treatment process. Standard solution treatment usually takes place at 950-1150℃ for 1-2 hours and then rapidly cooled, which can eliminate processing stress and form a uniform austenite structure to ensure the corrosion resistance and ductility of the material.

Nickel Alloy 20 Pipe Specification

Specification : ASTM B729, B464, B468/ ASME SB729, SB464, SB468
Pipe Range : ½"NB to 24"NB / SCH 10 – SCH XXS
Tubes Range: 1mm OD to 254mm OD / Thickness 0.1 to 20mm
Type : Seamless / ERW / Welded / Fabricated Pipes
Form : Round, Square, Rectangular, Oval, Hydraulic Etc
Length : Single Random, Double Random & Required Length
End : Plain End, Beveled End, Treaded
Schedule : SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS
Packing : Packed in Wooden Boxes, Plastic Bags, Steel Strips Bundled, or as per Customers Requests

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ASTM B729 Alloy 20 Pipe Chemical composition

The composition design of Alloy 20 steel pipe is based on nickel, and chromium forms a dense oxide film to resist acidic medium corrosion, while molybdenum and copper further enhance the resistance to pitting and crevice corrosion. The addition of niobium effectively inhibits the precipitation of carbides, prevents intergranular corrosion, and ensures that the material remains stable during welding and long-term use. Its microstructure is mainly austenite, and after solid solution treatment, a uniform structure is formed, which avoids the formation of harmful phases and ensures the reliability of the material.

UNS N08020 Pipe Mechanical properties

Alloy 20 steel pipe maintains high strength and ductility at both room temperature and high temperature. Its tensile strength is ≥550 MPa, yield strength is ≥240 MPa, and elongation is ≥30%, which can withstand mechanical stress under complex working conditions.

Alloy 20 Pipe and Tube Application

Flue Gas Desulfurization (FGD) System: Desulfurization device of coal-fired power plants.
Wet-process phosphoric acid production: Phosphoric acid evaporators, reactors and transmission pipelines.
Oil and gas extraction: Pipe fittings, transmission pipelines and wellhead equipment in acid gas extraction.
Seawater and semi-salt water systems: Seawater heat exchangers, condensers and water pipes.
Waste sulfuric acid recovery and treatment: Waste sulfuric acid regeneration equipment and pickling equipment.

Alloy 20 Comparison Between Corrosion Temperature with Other Alloys

	Critical pitting	Critical crevice	Pitting resistance
Alloy Grade	corrosion temp., °C (°F)	corrosion temp., °C (°F)	equivalent (PRE)**
316	15 (60)	<0 (32)	24
904L	45 (113)	25 (77)	37
20	15 (59)	<10 (50)	29
825	30 (86)	<5 (41)	32
G-3	70 (158)	40 (104)	45
1925hMo	70 (158)	40 (104)	48
625	77.5 (171.5)	57.5 (135.5)	52
33	85 (185)	40 (104)	50
30	75 (167)	50 (122)	46
31	85* (185)	65 (149)	54

Alloy 2.4660 Pipe Size Chart

Nominal Pipe Size, in.	Outside Diameter	Nominal Wall Thickness
Nominal Pipe Size, in.	Outside Diameter	Schedule No. 10	Schedule No. 40	Schedule No. 80
Inches
1/4	0.540	0.065	0.088	…
3/8	0.675	0.065	0.091	0.126
1/2	0.840	0.083	0.109	0.147
3/4	1.050	0.083	0.113	0.154
1	1.315	0.109	0.133	0.179
1 1/4	1.660	0.109	0.140	0.191
1 1/2	1.900	0.109	0.145	0.200
2	2.375	0.109	0.154	0.218
2 1/2	2.875	0.120	0.203	0.276
3	3.500	0.120	0.216	0.300
Millimetres
1/4	13.72	1.65	2.24	…
3/8	17.14	1.65	2.31	3.2
1/2	21.34	2.11	2.77	3.73
3/4	26.67	2.11	2.87	3.91
1	33.40	2.77	3.38	4.55
1 1/4	42.16	2.77	3.56	4.85
1 1/2	48.26	2.77	3.68	5.08
2	60.32	2.77	3.91	5.54
2 1/2	73.02	3.05	5.16	7.04
3	88.90	3.05	5.49	7.62
^A The pipe schedules shown conform with standards adopted by the American National Standards Institute