Alloy 20 Pipe
Alloy 20 pipe is a novel material developed from austenitic stainless steel by increasing nickel content to 32%-38%, precisely blending molybdenum and copper elements, and introducing niobium as a stabilizing element. It combines the cost-effectiveness of stainless steel with the corrosion resistance of nickel-based alloys. Compared to standard 316L stainless steel pipe, Alloy 20 pipe offers superior corrosion performance. Compared to Hastelloy C276, it also offers lower costs.
After over seventy years of development, this alloy has found extensive applications across petrochemical, offshore engineering, nuclear industries, and more, establishing itself as a cross-industry solution for highly corrosive environments.
As a alloy 20 pipe supplier in China, KAYSUNS supply both seamless and welded 20 alloy pipes. We are committed to providing customers with reliable 20 alloy pipe solutions. We aim to effectively assist clients in extending project lifespans and reducing counterfeiting costs through the professionalism and reliability of our products.
- ASTM B729 UNS N08020
- ASTM B464 UNS N08020
- ASTM SA/A312 UNS N08020
- ASTM SA/A213 UNS N08020
- ASTM SA/A269 UNS N08020
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Alloy 20 Pipe Equivalent Materials
Alloy 20 possesses a globally unified standard identification system with clearly defined correspondences across regional standards:
- ASTM B729/ASME SB729 UNS N08020
- EN/DIN W.Nr 2.4660
- French AFNOR Z2NCUD31-20AZ
- GB/T NS143 (0Cr20Ni35Mo3Cu4Nb).
Chemical Composition of Alloy 20 Pipe (UNS N08020), wt.%
| C | Mn | Si | P | S | Cr | Ni | Mo | Cu | Nb + Ta | Fe |
|---|---|---|---|---|---|---|---|---|---|---|
| ≤ 0.07 | ≤ 2.00 | ≤ 1.00 | ≤ 0.045 | ≤ 0.035 | 19.0 – 21.0 | 32.0 – 38.0 | 2.0 – 3.0 | 3.0 – 4.0 | 8 × C – 1.00 | Balance |
Mechanical Properties of N08020 Pipe
| Tensile Strength Rm (MPa) | Yield Strength Rp0.2 (MPa) | Elongation A (%) | Hardness (Reference) |
|---|---|---|---|
| ≥ 551 | ≥ 241 | ≥ 30 | ≤ 217 HBW |
Delivery condition: Annealed / Solution Annealed
Note: ASTM standards generally do not specify a mandatory hardness limit; hardness is shown for reference only.
Additional Information
| Item | Value / Description |
|---|---|
| Density | ≈ 8.08 g/cm³ |
| Typical Standards | ASTM B729 / B464 / A312 / A358 / A249 / A269 |
| ASME Equivalent | ASME SA-312 |
| Key Features | Excellent resistance to sulfuric acid, good resistance to stress corrosion cracking and intergranular corrosion |
Our Capacity
- Alloy 20 Seamless Pipe: 1/2“ – 18” / SCH10S – SCH160S
- Alloy 20 Welded Pipe: 8“ – 104” / SCH5S – SCH80S
- Alloy 20 Tubings: 6 mm – 204mm / 0.8mm ~ 4mm
Application of Alloy 20 pipe
Leveraging its unique corrosion resistance, N08020 alloy is indispensable in highly corrosive environments. Typical applications include:
(I) Chemical and Pharmaceutical Industries
• Sulfuric acid systems: Storage tanks, evaporators, and transport pipelines under 93% concentration and 120°C operating conditions
• Multi-media equipment: Phosphoric acid concentration units, chlor-alkali industry brine pipelines, pharmaceutical sterile reactors
• Corrosion protection components: Mixed acid reaction vessels, heat exchangers in catalyst recovery systems
In this sector, its service life exceeds traditional stainless steel by over 5 times, significantly reducing equipment maintenance costs.
(2) Marine and Environmental Engineering
• Desalination: High-pressure pump shafts, heat exchange tubes, reverse osmosis system components
• Flue Gas Desulfurization: FGD system spray layers, absorber tower linings
• Marine Equipment: Subsea valve bodies, platform corrosion-resistant structural components
(III) High-End Manufacturing Sectors
• Nuclear Industry: Nuclear waste storage tank linings
• Food Processing: Organic acid treatment equipment
• Hydrogen Energy Testing: Hydrogen embrittlement-resistant storage and transport equipment components
Corrosion Resistance Comparison
| Corrosive Environment | Alloy 20 (N08020) | 316L (S31603) | 2507 Duplex (S32750) | 254 SMO (S31254) | Hastelloy C-276 (N10276) |
|---|---|---|---|---|---|
| Sulfuric Acid | Excellent | Poor to Fair | Fair | Good | Outstanding |
| Pitting / Crevice Corrosion | Fair | Fair | Excellent | Outstanding | Outstanding |
| Chloride Stress Corrosion Cracking (SCC) | Good | Poor | Excellent | Excellent | Outstanding |
| Intergranular Corrosion | Good (Nb stabilized) | Good (Low C grade) | Good | Excellent | Excellent |
| Mixed Acids / Severe Corrosive Media | Fair | Poor | Fair | Good | Best in class |
Contact Us
- RM901 No.22 Tangjiaqiao Road Wenzhou China
- +86 577 8551 1171
- [email protected]
- https://www.kaysuns.com/
