Alloy 20 pipe is designed for resistance to sulfuric acid. Its nickel, chromium, molybdenum and copper contents all give it excellent resistance to general corrosion. The limited carbon content and niobium stabilization treatment allow its welded construction to be used in corrosive environments, usually without the need for post-weld heat treatment. Alloy 20 has practical immunity to chloride stress corrosion cracking. It is designed to provide maximum corrosion resistance in a wide range of severe chemical environments, and excels in handling sulfuric acid.
UNS N08020 Pipe Performance Characteristics
Corrosion resistance: UNS N08020 Pipe has excellent corrosion resistance to various strong acids such as sulfuric acid, phosphoric acid, nitric acid, as well as chlorides, salt solutions, etc. In an environment containing chloride ions, it can effectively resist pitting, crevice corrosion and stress corrosion cracking.
Mechanical properties: It has good strength and toughness, tensile strength ≥550MPa, yield strength ≥240MPa, elongation ≥30%, hardness HB135-220, can withstand certain pressure and external force, and maintain structural stability under complex working conditions.
Processing performance:Alloy 20 pipe has good formability and is suitable for processing processes such as bending and expansion. The added niobium element can provide minimal carbide precipitation during welding, so that its welding performance is also good. It can be processed into pipes of various shapes and sizes to meet the needs of different projects.
High temperature resistance: It can still maintain good mechanical properties and corrosion resistance in high temperature environments. It can be used for pipelines that transport hot water or steam, and can withstand the effects of high temperature media to a certain extent.
Specification Chart of Alloy 20 Pipe
| Thickness | 0.3mm – 50 mm, SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS |
| Outer Diameter | 6.00 mm OD up to 914.4 mm OD, Sizes up to 24” NB |
| Type | Seamless / ERW / Welded / Fabricated / CDW |
| Form | Round Tubes, Square Tubes, Rectangular Tubes, Coiled Tubes, “U” Shape, Pan Cake Coils, Hydraulic Tubes |
| Length | Single Random, Double Random & Required Length |
| End | Plain End, Beveled End, Treaded. |
UNS N08020 Pipe Manufacturing Standards
Alloy 20 pipe is manufactured to strict industry standards to ensure product quality and performance:
ASTM B729 / ASME SB 729: Standard Specification for Seamless Nickel Alloy Pipe.
ASTM B464 / ASME SB 464: Standard Specification for Welded Nickel Alloy Pipe.
ASTM B468 / ASME SB 468: Standard Specification for Welded Nickel Alloy Pipe.
ASTM B366 / ASME SB 366: Standard Specification for Wrought Nickel and Nickel Alloy Butt-Weld Fittings.
UNS N08020: A designation in the Unified Numbering System.
Werkstoff Nr. 2.4660: A German material standard number.
Chemical Composition of Alloy20 Pipe
| Alloy 20 | Ni | C | Mo | Mn | Si | Fe | Cu | S | P | Cr | Nb+Ta |
| 32 – 38 | 0.07 max | 2 – 3 | 2.0 max | 1.0 max | remainder | 3 – 4 | 0.035 max | 0.045 max | 19 – 21 | 8 * carbon -1.00 |
Mechnaical Analysis of Alloy 20 Pipe and Tube
| Density | Melting Point | Yield Strength (0.2%Offset) | Tensile Strength | Elongation |
| 8.1 g/cm3 | 1443 °C (2430 °F) | Psi – 35000 , MPa – 241 | Psi – 80000 , MPa – 551 | 30% |
Material Equivalent Grade of UNS N08020 Pipe and Tube
| STANDARD | UNS | WERKSTOFF NR. | AFNOR | EN |
| Alloy 20 | N08020 | 2.466 | Z2NCUD31-20AZ | NiCr20CuMo |
ASTM B729 UNS N08020 Pipe and Tube Dimension
| DN | NPS | OD 0 | Sch5s T | Sch5s kg/m | Sch10s T | Sch10s kg/m | Sch40s T | Sch40s kg/m | Sch80s T | Sch80s kg/m |
| 6 | 1/8 | 10.3 | — | — | 1.24 | 0.28 | 1.73 | 0.37 | 2.41 | 0.47 |
| 8 | 1/4 | 13.7 | — | — | 1.65 | 0.49 | 2.24 | 0.63 | 3.02 | 0.8 |
| 10 | 3/8 | 17.1 | — | — | 1.65 | 0.63 | 2.31 | 0.84 | 3.2 | 1.1 |
| 15 | 1/2 | 21.3 | 1.65 | 0.82 | 2.11 | 1 | 2.77 | 1.27 | 3.73 | 1.62 |
| 20 | 3/4 | 26.7 | 1.65 | 1.04 | 2.11 | 1.28 | 2.87 | 1.69 | 3.91 | 2.2 |
| 25 | 1 | 33.4 | 1.65 | 1.33 | 2.77 | 2.09 | 3.38 | 2.5 | 4.55 | 3.24 |
| 32 | 1 1/4 | 42.2 | 1.65 | 1.68 | 2.77 | 2.7 | 3.56 | 3.39 | 4.85 | 4.47 |
| 40 | 1 1/2 | 48.3 | 1.65 | 1.95 | 2.77 | 3.11 | 3.68 | 4.05 | 5.08 | 5.41 |
| 50 | 2 | 60.3 | 1.65 | 2.44 | 2.77 | 3.93 | 3.91 | 5.44 | 5.54 | 7.48 |
| 65 | 2 1/2 | 73 | 2.11 | 3.77 | 3.05 | 5.26 | 5.16 | 8.63 | 7.01 | 11.41 |
| 80 | 3 | 88.9 | 2.11 | 4.6 | 3.05 | 6.45 | 5.49 | 11.29 | 7.62 | 15.27 |
| 90 | 31/2 | 101.6 | 2.11 | 5.29 | 3.05 | 7.4 | 5.74 | 13.57 | 8.08 | 18.63 |
| 100 | 4 | 114.3 | 2.11 | 5.96 | 3.05 | 8.36 | 6.02 | 16.07 | 8.56 | 22.32 |
| 125 | 5 | 141.3 | 2.77 | 9.67 | 3.4 | 11.57 | 6.55 | 21.77 | 9.53 | 30.97 |
| 150 | 6 | 168.3 | 2.77 | 11.55 | 3.4 | 13.48 | 7.11 | 28.26 | 10.97 | 42.56 |
| 200 | 8 | 219.1 | 2.77 | 15.09 | 3.76 | 19.96 | 8.18 | 42.55 | 12.7 | 64.64 |
| 250 | 10 | 273.1 | 3.4 | 23.08 | 4.19 | 27.78 | 9.27 | 60.31 | 12.7 | 96.01 |
| 300 | 12 | 323.9 | 3.96 | 31.89 | 4.57 | 36 | 9.53 | 73.88 | 12.7 | 132.08 |
| 350 | 14 | 355.6 | 3.96 | 35.06 | 4.78 | 41.3 | — | — | — | — |
| 400 | 16 | 406.4 | 4.19 | 42.41 | 4.78 | 47.29 | — | — | — | — |
| 450 | 18 | 457.2 | 4.19 | 47.77 | 4.78 | 53.26 | — | — | — | — |
Testing of UNS N08020 Pipe and Tube
Chemical industry
Oil and gas industry
Food processing industry
Pharmaceutical industry
Heat exchange field
Marine engineering field
Alloy 20 Seamless Pipe and Tube Surface Finish
| Surface | Internal Surface(ID) | Internal Surface(ID) | Exterbal Surface(OD) | Exterbal Surface(OD) |
| Finish | Roughness Average(RA) μ inch | Roughness Average(RA) μm | Roughness Average(RA) μ inch | Roughness Average(RA) 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 |
Application Areas
Chemical industry
Oil and gas industry
Food processing industry
Pharmaceutical industry
Heat exchange field
Marine engineering field
You can get an offer for products in below material forms:
-Pipe and Tube (EN 10216-5, ASTM A213, ASTM A249, A312, A790,)
-Forged Fitting and Flange (ASTM A182 , ASTM A105,ASTM B564 )
-Butt Weld Fittings (ASTM A234, ASTM A403,ASTM A815)
-Round bar , Billet (ASTM A276, ASTM A479)
– Plate, Sheet, Strip(ASTM A240, EN 10028-7, A480)
-Bolting, Nuts（ASTM A193, A194, A320）
Alloy 20 Pipe Exported Countries
ZIZI Export Alloy 20 Pipe to Saudi Arabia, United Arab Emirates, Qatar, Bahrain, Oman, Kuwait, Turkey, Egypt, Yemen , Syria, Jordan, Cyprus, Singapore, Malaysia, Indonesia, Thailand, Vietnam, South Korea, Japan, Sri Lanka, Maldives, Bangladesh, Cambodia, Argentina, Bolivia, Brazil, Venezuela, Colombia, Ecuador, Guyana, Paraguay, Uruguay, United States Of America, Canada, Mexico, Panama, Jamaica, Bahamas, Denmark, Norway, Germany, France,Italy, United Kingdom, Spain, Belgium, Greece, Czech Republic, Portugal, Hungary, Albania, Austria, Finland, Ireland, Croatia, Malta, Nigeria, Algeria, Angola, South Africa, Libya, Egypt, Sudan, Europe, Africa, Asia, North America, South America, Middle East.etc