ASTM B366 UNS N08020 Pipe Fittings Manufacturer and Supplier
Alloy 20 UNS N08020 is a material made up of iron, nickel, chromium, molybdenum, and copper, and which is utilized to produce butt weld fittings that have been able to resist corrosion as per the standards of ASTM B366. However, it is important to observe that due to the high amounts of nickel (32 – 38%) and copper (3 – 4%), Alloy 20 is a nickel alloy. Moreover, it is more corrosion-resistant to sulfuric acid environment than austenitic stainless steels. The alloy is resistant to sulfuric acid due to Ni (32-38%), Cr (19-21%), Mo (2-3%) and Cu (3-4%) in concentrations up to 98% and temperature 66°C (150°F). Metinox Overseas provides Alloy 20 buttweld fittings to the ASTM B366 / ASME SB366 to accompany a mill test report issued by the EN 10204 3.1 standard, along with PMI testing, if requested, and heat number traceability to every batch of fittings.
Table of Contents
- Specifications of ASTM B366 UNS N08020 Pipe Fittings
- Chemical Composition of ASTM B366 UNS N08020 Pipe Fittings
- Mechanical Properties of ASTM B366 UNS N08020 Pipe Fittings
- Types of UNS N08020 Pipe Fittings
- Dimension Chart of ASTM B366 UNS N08020 Pipe Fittings
- WP vs CR Class Explanation
- Applications and Industrial Uses
- Related Products
- Frequently Asked Questions
Specifications of ASTM B366 UNS N08020 Pipe Fittings
| Specification Parameter | Details / Reference Standards |
|---|---|
| Material Specification | ASTM B366 / ASME SB366 |
| Dimensional Standards | ASTM, ASME / ANSI B16.9, B16.28, MSS-SP-43 |
| Size Range | ½" NB – 48" NPS |
| Manufacturing Type | Seamless / ERW / Welded / Fabricated |
| Available Schedules | SCH 10 – SCH XXS |
Chemical Composition of ASTM B366 UNS N08020 Pipe Fittings
| Alloy | Ni | C | Mo | Mn | Si | Fe | Cu | S | P | Cr | Nb |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Alloy 20 | 32 – 38 | 0.02 max | 2 – 3 | 1 – 2 | 0.7 max | Bal | 3 – 4 | 0.005 max | 0.02 max | 19 – 21 | 8×C min to 1.0% max |
Mechanical Properties of ASTM B366 UNS N08020 Pipe Fittings
| Density | Melting Point | Yield Strength (0.2% Offset) | Tensile Strength | Elongation |
|---|---|---|---|---|
| 8.1 g/cm³ | 1357–1399°C (2475–2550°F) | Psi – 35000, MPa – 241 | Psi – 80000, MPa – 551 | 30% |
Types of UNS N08020 Pipe Fittings
Alloy 20 45 Degree Elbow
Alloy 20 90 Degree Elbow
Alloy 20 Forged Union
Alloy 20 Full Coupling
Alloy 20 Half Coupling
Alloy 20 Pipe Cap
Alloy 20 Pipe Cross
Alloy 20 Pipe Plug
Alloy 20 Pipe Tee
Alloy 20 Reducing Coupling
Alloy 20 Reducing Tee
Alloy 20 Threaded Pipe Nipple
Sourcing ASTM B366 UNS N08020 Alloy 20 buttweld fittings for a corrosion-resistant application?
Metinox Overseas supplies ASTM B366-certified Alloy 20 fittings with EN 10204 3.1 MTRs and third-party inspection on request.
Request a QuoteDimension Chart of ASTM B366 UNS N08020 Pipe Fittings
| Nominal Pipe Size (NPS) | Outside Diameter at Bevel, mm (in.) | Center-to-End 90-deg Elbows, A mm (in.) | Center-to-End 45-deg Elbows, B mm (in.) |
|---|---|---|---|
| ½ | 21.3 (0.84) | 38 (1.50) | 16 (0.62) |
| ¾ | 26.7 (1.05) | 38 (1.50) | 19 (0.75) |
| 1 | 33.4 (1.32) | 38 (1.50) | 22 (0.88) |
| 1¼ | 42.2 (1.66) | 48 (1.88) | 25 (1.00) |
| 1½ | 48.3 (1.90) | 57 (2.25) | 29 (1.12) |
| 2 | 60.3 (2.38) | 76 (3.00) | 35 (1.38) |
| 2½ | 73.0 (2.88) | 95 (3.75) | 44 (1.75) |
| 3 | 88.9 (3.50) | 114 (4.50) | 51 (2.00) |
| 3½ | 101.6 (4.00) | 133 (5.25) | 57 (2.25) |
| 4 | 114.3 (4.50) | 152 (6.00) | 64 (2.50) |
| 5 | 141.3 (5.56) | 190 (7.50) | 79 (3.12) |
| 6 | 168.3 (6.62) | 229 (9.00) | 95 (3.75) |
| 8 | 219.1 (8.62) | 305 (12.00) | 127 (5.00) |
| 10 | 273.0 (10.75) | 381 (15.00) | 159 (6.25) |
| 12 | 323.8 (12.75) | 457 (18.00) | 190 (7.50) |
| 14 | 355.6 (14.00) | 533 (21.00) | 222 (8.75) |
| 16 | 406.4 (16.00) | 610 (24.00) | 254 (10.00) |
| 18 | 457.0 (18.00) | 686 (27.00) | 286 (11.25) |
| 20 | 508.0 (20.00) | 762 (30.00) | 318 (12.50) |
| 22 | 559.0 (22.00) | 838 (33.00) | 343 (13.50) |
| 24 | 610.0 (24.00) | 914 (36.00) | 381 (15.00) |
| 26 | 660.0 (26.00) | 991 (39.00) | 406 (16.00) |
| 28 | 711.0 (28.00) | 1 067 (42.00) | 438 (17.25) |
| 30 | 762.0 (30.00) | 1 143 (45.00) | 470 (18.50) |
| 32 | 813.0 (32.00) | 1 219 (48.00) | 502 (19.75) |
| 34 | 864.0 (34.00) | 1 295 (51.00) | 533 (21.00) |
| 36 | 914.0 (36.00) | 1 372 (54.00) | 565 (22.25) |
| 38 | 965.0 (38.00) | 1 448 (57.00) | 600 (23.62) |
| 40 | 1 016.0 (40.00) | 1 524 (60.00) | 632 (24.88) |
| 42 | 1 067.0 (42.00) | 1 600 (63.00) | 660 (26.00) |
| 44 | 1 118.0 (44.00) | 1 676 (66.00) | 695 (27.38) |
| 46 | 1 168.0 (46.00) | 1 753 (69.00) | 727 (28.62) |
| 48 | 1 219.0 (48.00) | 1 829 (72.00) | 759 (29.88) |
WP vs CR Class Explanation
| Property | WP20CB | CR20CB |
|---|---|---|
| Pressure Class | Standard | Higher rated |
| Wall Thickness | As per ASME B16.9 | Heavier than standard |
| Applicable Standard | ASTM B366 | ASTM B366 |
| Use Case | General chemical service | High-pressure acid service |
Applications and Industrial Uses of ASTM B366 UNS N08020 Pipe Fittings
Alloy 20 (UNS N08020) pipe fittings are specified in industries where exceptional resistance to sulfuric acid and other aggressive corrosive media is critical. Key service environments include:
- Paper & Pulp Companies
- High-Pressure Applications
- Oil and Gas Industry
- High Temperature Application
- Water Pipe Line
- Nuclear Power Plants
- Food Processing and Dairy Industries
- Boiler & Heat Exchangers
Request a Quote for ASTM B366 UNS N08020 Alloy 20 Pipe Fittings
ASTM B366 / ASME SB366 | UNS N08020 | Sizes ½" to 48" NPS | WP20CB & CR20CB
Contact UsFrequently Asked Questions
ASTM B366 UNS N08020 is a standard specification for nickel-iron-chromium alloy (Alloy 20) pipe fittings used in corrosion-resistant applications, especially in acidic environments.
Alloy 20 (Carpenter 20) is a corrosion-resistant alloy containing nickel, chromium, and copper, commonly used in pipe fittings for handling sulfuric acid and chemical processing.
WP20CB refers to wrought Alloy 20 pipe fittings manufactured as per ASTM B366, where "WP" means wrought pipe fittings and "20CB" indicates the Alloy 20 grade.
In ASTM B366, both CR20CB and WP20CB are wrought Alloy 20 fittings. "CR" denotes corrosion-resistant class fittings designed for higher pressure ratings, while "WP" refers to standard wrought pipe fittings. The difference relates to pressure class, not cast vs wrought.
UNS N08020 is commonly equivalent to DIN 2.4660, EN X2NiCrMoCuN20-18-7, and BS NA 20, depending on the specification.
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