Nickel Alloys Alloy 20 Flanges Overview
Zeon Exports supplies Nickel Alloy 20 (UNS N08020) flanges, a nickel-iron-chromium alloy with copper and molybdenum additions developed for maximum resistance to sulfuric acid, for chemical, pharmaceutical and food processing piping.
Nickel Alloy 20 Flanges connect and seal sulfuric acid and other aggressive chemical process piping. Its nickel-iron-chromium base with copper and molybdenum gives outstanding resistance to sulfuric, phosphoric and nitric acids, while niobium stabilization prevents sensitization and intergranular corrosion after welding.
- Niobium-stabilized against sensitization and weld-zone corrosion
- Tensile ≥551 MPa, yield ≥241 MPa in the annealed condition
- EN 10204 3.1 certified, export-ready worldwide
Quick Specifications of Nickel Alloys Alloy 20 Flanges
Nickel Alloy 20 Flanges are produced to internationally recognized specifications.
| Field | Detail |
|---|---|
| Material/Grade | Nickel Alloy 20 |
| UNS | N08020 |
| DIN/Werkstoff Number | 2.4660 |
| Standards | ASTM B462 |
| Form | Weld Neck, Slip-On, Blind, Socket Weld |
| Finish | As specified (confirm on order) |
| Heat Treatment | Annealed |
| Certification | EN 10204 3.1 |
Equivalent Grades of Alloy 20
Alloy 20 is recognized under several international designations below.
| UNS | DIN/Werkstoff Number | Common Trade Name | ASTM/ASME Standard |
|---|---|---|---|
| N08020 | 2.4660 | Carpenter 20 / Alloy 20Cb-3 | ASTM B462 |
Chemical Composition of Alloy 20
Composition per ASTM B462 for UNS N08020; exact limits can vary slightly by specification and heat.
| Element | Composition (%) |
|---|---|
| Nickel (Ni) | 32.0 – 38.0 |
| Chromium (Cr) | 19.0 – 21.0 |
| Molybdenum (Mo) | 2.0 – 3.0 |
| Copper (Cu) | 3.0 – 4.0 |
| Niobium (Nb), min–max | 8×C – 1.00 |
| Carbon (C), max | 0.07 |
| Manganese (Mn), max | 2.00 |
| Silicon (Si), max | 1.00 |
| Phosphorus (P), max | 0.045 |
| Sulphur (S), max | 0.035 |
| Iron (Fe) | Balance |
Physical Properties of Nickel Alloy 20
Physical properties for Alloy 20, confirmed against manufacturer data.
| Property | Value |
|---|---|
| Density | ~8.08 g/cm3 (typical) |
| Melting Range | Confirm against applicable datasheet |
| Magnetic Behaviour | Essentially non-magnetic |
Mechanical Properties of Nickel Alloys Alloy 20 Flanges
Minimum mechanical properties for annealed UNS N08020 per ASTM B462.
| Property | Minimum Value |
|---|---|
| Tensile Strength | 551 MPa (80 ksi) |
| Yield Strength (0.2% offset) | 241 MPa (35 ksi) |
| Elongation | 30% |
| Hardness | 217 HB max |
| Condition | Annealed |
Corrosion Resistance of Nickel Alloy 20
- Nickel Alloy 20 Flanges were developed specifically for maximum resistance to sulfuric acid across a wide range of concentrations and temperatures.
- Acid resistance: copper and molybdenum give dual-mechanism protection against sulfuric acid attack.
- Pitting and crevice resistance: performs well in chloride-bearing and oxidizing salt environments.
- Weld-zone resistance: niobium stabilization prevents sensitization and intergranular corrosion after welding.
Heat Resistance of Nickel Alloy 20
Nickel Alloy 20 flanges have good mechanical properties at both ambient and moderately elevated temperatures, but are generally not selected for high-temperature structural service. Confirm exact service limits against the governing standard and application before specifying.
Key Properties of Nickel Alloys Alloy 20 Flanges
Beyond corrosion and heat performance, Alloy 20 flanges offer these additional properties.
- Readily fabricable, well suited to chemical processing equipment
- Good weldability without post-weld sensitization risk
- Good strength and toughness at ambient temperatures
- Widely used across chemical, pharmaceutical and food processing
Benefits of Nickel Alloys Alloy 20 Flanges
Choosing Alloy 20 flanges from Zeon Exports delivers measurable advantages for your project.
- Purpose-built resistance to sulfuric acid where stainless falls short
- Full MTC 3.1 documentation for project QA/QC requirements
- Multiple flange types and pressure classes to match project specs
- Reliable bulk supply with consistent ready stock
- Competitive export pricing for large industrial orders
- Fast dispatch to global project sites and ports
Related Products
Explore related Nickel Alloy products from Zeon Exports.
Request a Quote for Nickel Alloys Alloy 20 Flanges
Ready to source Nickel Alloy 20 Flanges? Share your size, pressure class and quantity requirements and our team will respond with a quote.
Call: +91 98205 33105
Email: info@zeonexports.com
Website: www.zeonexports.com
Address: A-7/9, Saboo Building, Ardeshir Dady Cross Lane, Cawasji Patel Tank Road, Mumbai – 400004
Frequently Asked Questions About Nickel Alloys Alloy 20 Flanges
Common questions about Nickel Alloy 20 Flanges, answered below.
Q1: What is Nickel Alloy 20?
Ans. Alloy 20 (UNS N08020, also called Carpenter 20) is a nickel-iron-chromium alloy developed specifically for sulfuric acid resistance.
Q2: What flange types are available in Alloy 20?
Ans. We supply Weld Neck, Slip-On, Blind and other flange types manufactured to ASTM B462.
Q3: What standards do Alloy 20 flanges meet?
Ans. Flanges are manufactured to ASTM B462, certified to EN 10204 3.1 mill test certificates.
Q4: Is Alloy 20 magnetic?
Ans. Alloy 20 is essentially non-magnetic, being an austenitic nickel-iron-chromium alloy.
Q5: Is Alloy 20 suitable for sulfuric acid service?
Ans. Yes, Alloy 20 was specifically developed for maximum resistance to sulfuric acid across a range of concentrations.
Q6: How does Alloy 20 differ from 316L stainless?
Ans. Alloy 20 has far higher nickel, plus copper and niobium stabilization, giving much stronger sulfuric acid and chloride SCC resistance than 316L.
Q7: What certification is provided with orders?
Ans. Every order ships with EN 10204 3.1 mill test certificates confirming grade, heat and dimensions.
Q8: Does Zeon Exports supply custom flange sizes?
Ans. Yes, flanges are available in custom sizes and pressure classes on request for bulk industrial orders.
