Alloy 20 Pipe Fittings are produced to ASTM B366 UNS N08020 for high performance in severe corrosive and chemically aggressive applications. They are known to have good resistance to both sulfuric acid and chloride stress corrosion cracking and oxidation and are widely used in chemical processing, marine and power generation industries. We manufacture and supply seamless and welded high quality Alloy 20 (20Cb-3®) pipe fittings as per various standards like ASME B16.9, ASME B16.25, MSS-SP-43. Our fittings provide reliable mechanical strength, dimensional accuracy and consistent performance over high temperature and cryogenic applications. Metinox Overseas guarantees long-lasting and precise results within critical industrial uses with rigorous quality management, cutting-edge manufacturing and comprehensive testing.
Table of Contents
- Specifications of Alloy 20 Pipe Fittings
- Chemical Composition of Alloy 20 Pipe Fittings
- Mechanical Properties of Alloy 20 Pipe Fittings
- Equivalent Grades of Alloy 20 Pipe Fittings
- Types of Alloy 20 Pipe Fittings
- Dimension Chart of Alloy 20 Pipe Fittings
- Alloy 20 Corrosion Resistance Chart
- Applications Uses of Alloy 20 Pipe Fittings
- Related Products
- Frequently Asked Questions
Specifications of Alloy 20 Pipe Fittings
| Property | Specification / Details |
|---|---|
| Material Specification | ASTM B366 / ASME SB366 |
| Dimension Standards | ASME/ANSI B16.9, ASME B16.28, MSS-SP-43 |
| Standard Details | ASME B16.9: Factory-Made Wrought Buttwelding Fittings ASME B16.25: Buttwelding Ends ASME B16.28: Wrought Steel Butt-Welded Short Radius Elbows & Returns Bends MSS SP-43: Wrought and Fabricated Butt-Welding Fittings for Low Pressure, Corrosion Resistant Applications |
| Size Range (General) | 1/2" NB to 24" NB in Sch 10s, 40s, 80s, 160s, XXS DN15 ~ DN600 (for 1/2" NB to 48" NB range) |
| Seamless Butt Weld Size | 1/2" - 10" |
| Welded Butt Weld Size | 1/2" - 48" |
| Heat Treatment | Minimum 1066°C / 1950°F, rapid quench |
| Thickness / Schedule | Sch 5s, Sch 10s, Sch 40s, Sch 80s, Sch 160s, Sch XXS |
| Bending Radius | R=1D, 2D, 3D, 5D, 6D, 8D, 10D, or Custom |
| Type | Seamless / Welded / Fabricated |
Chemical Composition of Alloy 20 Pipe Fittings
| Grade | C | Mn | Si | S | Cu | Ni | Cr | Fe | Mo | Nb + Ta | 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 | 8 x C min | 1.00% max. | 0.045 max |
Mechanical Properties of Alloy 20 Pipe Fittings
| Element | Density | Melting Point | Tensile Strength | Yield Strength (0.2% Offset) | Elongation |
|---|---|---|---|---|---|
| Alloy 20 | 8.1 g/cm3 | 1355-1399°C (2470-2550°F) | Psi - 80,000, MPa - 551 | Psi - 35,000, MPa - 241 | 30% |
Equivalent Grades of Alloy 20 Pipe Fittings
| Standard / Designation System | Material Grade / Number |
|---|---|
| Common Name | Alloy 20 |
| UNS | N08020 |
| Werkstoff Nr. (Germany) | 2.4660 |
| EN (European Norm) | NiCr20CuMo |
| AFNOR (France) | Z2NCUD31-20AZ |
Types of Alloy 20 Pipe Fittings
Alloy 20 Buttweld Cap
Alloy 20 Concentric Reducer
Alloy 20 Cross
Alloy 20 Eccentric Reducer
Alloy 20 Elbow
Alloy 20 Long Stub End
Alloy 20 Short Stub End
Alloy 20 Tee
Dimension Chart of Alloy 20 Pipe Fittings
| NPS | O.D. at Bevel | I.D. at End | Wall Thickness | Elbows / Tees A, B, C, M | Return Bends O | Return Bends K | Alignment U | Reducers H | Caps E |
|---|---|---|---|---|---|---|---|---|---|
| 1/2 to 2-1/2 | +0.06 / -0.03 | +/-0.03 | >= 87.5% of nominal | +/-0.06 | +/-0.25 | +/-0.25 | +/-0.03 | +/-0.06 | +/-0.12 |
| 3 to 3-1/2 | +/-0.06 | +/-0.06 | >= 87.5% of nominal | +/-0.06 | +/-0.25 | +/-0.25 | +/-0.03 | +/-0.06 | +/-0.12 |
| 4 | +/-0.06 | +/-0.06 | >= 87.5% of nominal | +/-0.06 | +/-0.25 | +/-0.25 | +/-0.03 | +/-0.06 | +/-0.12 |
| 5 to 8 | +0.09 / -0.06 | +/-0.06 | >= 87.5% of nominal | +/-0.06 | +/-0.25 | +/-0.25 | +/-0.03 | +/-0.06 | +/-0.25 |
| 10 to 18 | +0.16 / -0.12 | +/-0.12 | >= 87.5% of nominal | +/-0.09 | +/-0.38 | +/-0.25 | +/-0.06 | +/-0.09 | +/-0.25 |
| 20 to 24 | +0.25 / -0.19 | +/-0.19 | >= 87.5% of nominal | +/-0.09 | +/-0.38 | +/-0.25 | +/-0.06 | +/-0.09 | +/-0.25 |
| 26 to 30 | +0.25 / -0.19 | +/-0.19 | >= 87.5% of nominal | +/-0.12 | --- | --- | --- | +/-0.19 | +/-0.38 |
| 32 to 48 | +0.25 / -0.19 | +/-0.19 | >= 87.5% of nominal | +/-0.19 | --- | --- | --- | +/-0.19 | +/-0.38 |
Alloy 20 Corrosion Resistance Chart
| Media | Concentration (Weight %) | Temperature | Mean Corrosion Rate (mpy - mils per year) |
|---|---|---|---|
| Sulfuric Acid (H2SO4) | 10% | 66°C (150°F) | < 0.5 |
| Sulfuric Acid (H2SO4) | 50% | 66°C (150°F) | < 1.0 |
| Sulfuric Acid (H2SO4) | 98% | 66°C (150°F) | < 2.0 |
| Acetic Acid | 99% | Boiling | < 1.0 |
| Phosphoric Acid | 85% | 66°C (150°F) | < 1.0 |
Applications Uses of Alloy 20 Pipe Fittings
Alloy 20 pipe fittings are used in acidic, chloride-bearing and chemically aggressive environments where corrosion resistance and reliable mechanical performance are required.
- Oil and gas industry
- Pulp and paper industry
- Power plants
- Energy industries
- Furniture
- Pharmaceutical processing industry
- Modern architecture
- Home appliances
- Water waste projects
- Dairy and food processing
Frequently Asked Questions
Alloy 20 pipe fittings are corrosion-resistant fittings made from a nickel-based alloy, used in chemical and acidic environments.
It is a standard that covers wrought Alloy 20 pipe fittings designed for high corrosion resistance applications.
Alloy 20 is a nickel-iron-chromium alloy with copper and molybdenum, known for excellent resistance to sulfuric acid and chemicals.
It is used because it offers strong resistance to corrosion, especially in acidic and chemical processing environments.
They have high corrosion resistance, good mechanical strength, resistance to stress corrosion cracking, and stability at high temperatures.
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