Alloy 20 Pipe
Steel Pipe & Tubes has been a leading supplier of Alloy 20 piping solutions.
Alloy 20 Pipe & Tube Suppliers, ASTM B729 UNS N08020 Seamless & Welded Pipe Manufacturer in India
Stellar Alloys stands as a leading name in the supply and manufacturing of Alloy 20 Pipes and Tubes, delivering ASTM B729 UNS N08020 seamless and welded solutions that meet global standards. Trusted by clients across the chemical, pharmaceutical, and food processing sectors, our Alloy 20 products are engineered for exceptional resistance to sulfuric acid, chloride stress cracking, and pitting corrosion. Designed to balance strength with reliability, these pipes and tubes provide the durability industries need for demanding applications. With a strong focus on quality, timely delivery, and customer satisfaction, Stellar Alloys has become the preferred partner for businesses seeking dependable Alloy 20 piping solutions that perform under the toughest conditions.
What is Alloy 20 Pipe & Tube?
Alloy 20 Pipe and Tube is a nickel-iron-chromium austenitic alloy enriched with copper and molybdenum, designed specifically to resist acid attack. It offers excellent corrosion resistance, good fabrication ability, and durability in aggressive environments. Favored in industries handling harsh chemicals, Alloy 20 is often seen as a cost-effective alternative to more expensive nickel alloys.
Types of Alloy 20 Pipes & Tubes
Alloy 20 Pipes and Tubes are available in a wide range of types and forms, each designed to meet specific industrial needs while ensuring strong corrosion resistance and reliable performance in demanding environments.
Alloy 20 Seamless Pipes
Alloy 20 Seamless Tubes
Alloy 20 Welded Pipes
Alloy 20 Welded Tubes
Alloy 20 ERW Pipes
Alloy 20 ERW Tubes
Equivalent Material Grades of Alloy 20 Pipe & Tube
Alloy 20 Pipes and Tubes are recognized under various international standards, and their equivalent material grades ensure compatibility and reliability across global industrial applications:
| STANDARD | UNS | WERKSTOFF NR. | AFNOR | EN | JIS | BS | GOST |
| Alloy 20 | N08020 | 2.4660 | Z2NCUD31-20AZ | NiCr20CuMo | – | – | – |
Applications of Alloy 20 Pipe & Tubing
Alloy 20 Pipes and Tubes are chosen across diverse industries for their resistance to corrosion, durability, and dependability in demanding applications:
- Chemical Industry
- Food Industry
- Petrochemical Industry
- Pharmaceutical Industry
- Power Generation
- Pulp & Paper Industry and
- Many more industries.
UNS N08020 Seamless Tube & Pipe Specifications
| Parameter | Details |
| Standard Specification | ASTM B729 / ASTM B464, ASME SB 729 / ASME SB 464 |
| Manufacturing Type | Seamless / ERW / Welded / Fabricated / CDW / CDS / DOM / CEW / 100% X Ray Welded |
| Thickness Range | SCH 5, SCH 10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXH, SCH XXS, SCH XS |
| Standard | SUS, JIS, AISI, ASTM, GB, DIN, EN |
DIN NR. 2.4660 Welded Pipe Standards
The following table highlights the standards, conditions, and key applications of Alloy 20 Welded Pipes, showcasing their advantages in corrosion-prone environments.
| Standard/Grade | Condition | Recommended Applications | Advantages |
| ASTM B729 Pipe | Stabilized annealed | Environments prone to pitting and chloride ion corrosion | Superior resistance against localized corrosion |
| Alloy 20 Welded Pipe | ASTM B729 | Areas where 316 alloy fails due to stress corrosion cracking | Reliable alternative with higher durability |
Dimensions, Sizes & Schedules of Alloy 20 Pipe & Tube
Understanding the comprehensive dimensions, schedules, and size specifications of Alloy 20 pipes is essential for proper material selection, ensuring optimal fit, performance, and compliance with project requirements in various industrial applications.
| Gauge | Outside Diameter Tolerance (mm) | Regular Wall (Schedule 40) mm | Thin Wall (Schedule 80) mm | Extra Thin Wall (Schedule 160) mm | Ultra Thin Wall (Schedule XXH) mm |
| 30 | 0.304 – 0.317 | 0.064 – 0.089 | |||
| 29 | 0.330 – 0.342 | ||||
| 28 | 0.355 – 0.368 | 0.076 – 0.102 | |||
| 27 | 0.406 – 0.419 | 0.089 – 0.115 | 0.064 – 0.089 | ||
| 26 | 0.457 – 0.469 | 0.089 – 0.114 | |||
| 25 | 0.508 – 0.520 | 0.115 – 0.140 | 0.089 – 0.114 | ||
| 24 | 0.558 – 0.571 | 0.114 – 0.140 | 0.089 – 0.114 | 0.051 – 0.102 | |
| 23 | 0.635 – 0.647 | 0.140 – 0.165 | 0.089 – 0.114 | 0.051 – 0.102 | |
| 22 | 0.711 – 0.723 | 0.140 – 0.165 | 0.096 – 0.121 | 0.077 – 0.102 | 0.051 – 0.102 |
| 21 | 0.812 – 0.825 | 0.140 – 0.165 | 0.102 – 0.127 | 0.051 – 0.102 | |
| 20 | 0.901 – 0.914 | 0.108 – 0.165 | 0.108 – 0.134 | ||
| 19 | 1.054 – 1.079 | 0.166 – 0.216 | 0.102 – 0.140 | 0.070 – 0.108 | |
| 18 | 1.257 – 1.282 | 0.191 – 0.241 | 0.127 – 0.165 | 0.083 – 0.121 | 0.051 – 0.102 |
| 17 | 1.460 – 1.485 | 0.177 – 0.229 | 0.115 – 0.152 | 0.083 – 0.127 | 0.057 – 0.102 |
| 16 | 1.638 – 1.663 | 0.204 – 0.254 | 0.127 – 0.165 | 0.096 – 0.133 | 0.070 – 0.121 |
| 15 | 1.816 – 1.841 | 0.204 – 0.254 | 0.127 – 0.165 | 0.096 – 0.134 | 0.070 – 0.121 |
| 14 | 2.082 – 2.133 | 0.216 – 0.292 | 0.165 – 0.229 | 0.114 – 0.165 | 0.076 – 0.134 |
| 13 | 2.387 – 2.438 | 0.267 – 0.343 | 0.191 – 0.267 | ||
| 12 | 2.743 – 2.749 | 0.267 – 0.321 | |||
| 11 | 3.023 – 3.073 | 0.293 – 0.368 | 0.216 – 0.292 | ||
| 10 | 3.378 – 3.429 | 0.318 – 0.394 | 0.216 – 0.292 |
Alloy 20 Rectangular & Square Pipe Dimensions
Alloy 20 rectangular and square pipes offer versatile geometric options for structural and industrial applications, with dimensions carefully engineered to meet specific space constraints and load-bearing requirements while maintaining the alloy’s superior corrosion resistance properties.
| DIMENSIONS (MM) | WALL (MM) | WEIGHT PER METRE (KG) | DIMENSIONS (MM) | WALL (MM) | WEIGHT PER METRE (KG) |
| 12.7 x 12.7 | 1.20 | 0.44 | 40 x 40 | 1.20 | 1.49 |
| 12.7 x 12.7 | 1.50 | 0.55 | 40 x 40 | 1.50 | 1.85 |
| 15 x 15 | 1.20 | 0.53 | 40 x 40 | 2.00 | 2.45 |
| 15 x 15 | 1.50 | 0.65 | 40 x 40 | 3.00 | 3.75 |
| 20 x 20 | 1.20 | 0.71 | 50 x 50 | 1.50 | 2.32 |
| 20 x 20 | 1.50 | 0.88 | 50 x 50 | 2.00 | 3.08 |
| 20 x 20 | 2.00 | 1.19 | 50 x 50 | 3.00 | 4.65 |
| 25 x 25 | 1.20 | 0.92 | 60 x 60 | 2.00 | 3.71 |
| 25 x 25 | 1.50 | 1.14 | 60 x 60 | 3.00 | 5.49 |
| 25 x 25 | 2.00 | 1.49 | 70 x 70 | 3.00 | 6.53 |
| 25 x 25 | 3.00 | 2.20 | 80 x 80 | 2.00 | 4.98 |
| 30 x 30 | 1.20 | 1.10 | 80 x 80 | 3.00 | 7.53 |
| 30 x 30 | 1.50 | 1.37 | 100 x 100 | 2.00 | 6.40 |
| 30 x 30 | 2.00 | 1.84 | 100 x 100 | 3.00 | 9.53 |
| 30 x 30 | 3.00 | 2.72 |
Tolerances of Alloy 20 Welded & ERW Pipe
Precise dimensional tolerances are critical for Alloy 20 welded and ERW (Electric Resistance Welded) pipes to ensure proper fit, performance, and compliance with ASTM standards while maintaining the alloy’s structural integrity and corrosion resistance properties.
| O.D. INCHES | WALL THICKNESS INCHES | O.D. +/- INCHES |
| 1/2″ to 1″ incl. | .025 to .065 | .005 |
| Over .065 to .134 | .010 | |
| 1 to 1-1/2″ incl. | .025 to .065 | .008 |
| Over .065 to .134 | .010 | |
| 1-1/2″ to 2″ incl. | .025 to .049 | .010 |
| Over .049 to .083 | .011 | |
| Over .083 to .148 | .012 | |
| 2″ to 2-1/2″ incl. | .032 to .065 | .012 |
| Over .065 to .109 | .013 | |
| Over .109 to .165 | .014 | |
| 2-1/2″ to 3-1/2″ incl. | .032 to .165 | .014 |
| Over .165 to .220 | .020 | |
| 3-1/2″ to 5″ incl. | .083 to .165 | .020 |
| Over .165 to .220 | .025 |
Chemical Composition of Alloy 20 Pipe (UNS N08020)
The chemical composition of Alloy 20 or UNS N08020 is carefully balanced to provide excellent resistance to sulfuric acid and other corrosive environments. This makes it ideal for demanding industrial applications.
| Element | C | Cr | Cu | Fe | Mn | Mo | Ni | P | Si | S | Nb (Cb) |
| Content (%) | ≤ 0.07 | 19.00 – 21.00 | 3.00 – 4.00 | Balance | ≤ 2.00 | 2.00 – 3.00 | 32.00 – 38.00 | ≤ 0.045 | ≤ 1.00 | ≤ 0.035 | ≥ 8 × C (min), ≤ 1.00 |
Mechanical Properties of Alloy 20 Tubing
Alloy 20 tubing combines strong mechanical properties such as high tensile and yield strength with excellent corrosion resistance, ensuring reliable performance in harsh chemical and industrial conditions.
| Product Form | Tensile Strengtd (ksi, min) |
Yield Strengtd (0.2% offset, ksi, min) |
Elongation (%, min) |
Reduction of Area (%, min) |
Hardness Brinell (max) |
Hardness Rockwell B (max) |
| Plate, Sheet | 80 | 35 | 30 | – | 217 | 95 |
| Bar, Shapes | 80 | 35 | 30 | 50 | – | – |
Physical Properties of Alloy 20 Tubing
The physical characteristics of Alloy 20 tubing, including density, melting point, and thermal conductivity, support its use in diverse applications requiring durability and stability under varying temperatures and stresses.
| Property | Value |
| Density | 0.278 lb/in³ |
| Melting Range | 2525 – 2630 °F |
| Electrical Resistivity | 651 Ohm-circ mil/ft |
| Modulus of Elasticity (Dynamic) | 28 × 106 psi |
| Temperature (°F) | Coefficient of Thermal Expansion (in/in °F × 10-6) | Thermal Conductivity (Btu·ft/ft²·hr·°F) |
| 70 | – | 6.7 |
| 212 | 8.16 | 7.57 |
| 392 | 8.37 | 8.56 |
| 572 | 8.62 | 9.53 |
| 752 | 8.76 | 10.5 |
| 842 | 8.84 | – |
| 932 | 8.91 | – |
Working Pressure & Pressure Rating of Alloy 20 Tube
The working pressure and pressure rating of Alloy 20 tubes are critical parameters that define their suitability for high-pressure applications in industries demanding strength and reliability under varying temperature and stress conditions.
| Tube O.D. (in.) | Wall Thickness of Tube (inches) | ||||||||
| .028 | .035 | .049 | .065 | .083 | .095 | .109 | .120 | ||
| Working Pressure (psig) | |||||||||
| 1/8 | 7900 | 10100 | |||||||
| 1/4 | 3700 | 4800 | 7000 | 9500 | |||||
| 5/16 | 3700 | 5400 | 7300 | ||||||
| 3/8 | 3100 | 4400 | 6100 | ||||||
| 1/2 | 2300 | 3200 | 4400 | ||||||
| 3/4 | 2200 | 3000 | 4000 | 4600 | |||||
| 1 | 2200 | 2900 | 3400 | 3900 | 4300 | ||||
Alloy 20 Resistance to Various Chemicals & Corrosive Environments
Alloy 20 offers excellent resistance to sulfuric acid and performs well against phosphoric acid, nitric acid, and aqueous salt solutions. It is highly effective in preventing chloride stress corrosion cracking by resisting pitting and crevice corrosion. However, in environments with chloride ions, caution is advised as corrosion rates may increase significantly.
Alloy 20 Seamless Pipe Weight Chart (Per Meter / Per Kg)
Understanding the weight per meter and per kilogram of Alloy 20 seamless pipes is essential for accurate project planning, cost estimation, and ensuring compatibility with structural and mechanical requirements.
| DIMENSIONS (MM) | WALL (MM) | WEIGHT PER METRE (KG) | DIMENSIONS (MM) | WALL (MM) | WEIGHT PER METRE (KG) |
| 12.7 x 12.7 | 1.20 | 0.44 | 40 x 40 | 1.20 | 1.49 |
| 12.7 x 12.7 | 1.50 | 0.55 | 40 x 40 | 1.50 | 1.85 |
| 15 x 15 | 1.20 | 0.53 | 40 x 40 | 2.00 | 2.45 |
| 15 x 15 | 1.50 | 0.65 | 40 x 40 | 3.00 | 3.75 |
| 20 x 20 | 1.20 | 0.71 | 50 x 50 | 1.50 | 2.32 |
| 20 x 20 | 1.50 | 0.88 | 50 x 50 | 2.00 | 3.08 |
| 20 x 20 | 2.00 | 1.19 | 50 x 50 | 3.00 | 4.65 |
| 25 x 25 | 1.20 | 0.92 | 60 x 60 | 2.00 | 3.71 |
| 25 x 25 | 1.50 | 1.14 | 60 x 60 | 3.00 | 5.49 |
| 25 x 25 | 2.00 | 1.49 | 70 x 70 | 3.00 | 6.53 |
| 25 x 25 | 3.00 | 2.20 | 80 x 80 | 2.00 | 4.98 |
| 30 x 30 | 1.20 | 1.10 | 80 x 80 | 3.00 | 7.53 |
| 30 x 30 | 1.50 | 1.37 | 100 x 100 | 2.00 | 6.40 |
| 30 x 30 | 2.00 | 1.84 | 100 x 100 | 3.00 | 9.53 |
| 30 x 30 | 3.00 | 2.72 |
Heat Treatment Guidelines for Alloy 20
Proper heat treatment is essential for stabilizing Alloy 20 and enhancing its corrosion resistance and mechanical properties.
Heat Treatment of Alloy 20:
- Alloy 20 cannot be hardened through heat treatment.
- Stabilized annealing is performed at 1750°F to 1850°F, followed by rapid water quenching.
- Stress relieving is possible on annealed material at temperatures up to 950°F.
- These processes help maintain alloy stability and minimize residual stresses without affecting corrosion resistance.
Suitable Welding Electrodes & Filler Materials for Alloy 20 Pipe
Selecting the right welding electrodes and filler materials is crucial to maintain Alloy 20 pipe’s integrity, corrosion resistance, and mechanical strength during fabrication and repair processes.
| Category | Details / Items |
| Marking on ASTM B729 UNS N08020 | Specification Material Grade Nominal Size Schedule or Wall Thickness Method of Manufacturing (Seamless / Welded) Heat Number Manufacturer’s Name or Custom Logo (on request) Sample Marked Pipe: ASTM B729 UNS N08020 12″ NB SCH 40S SEAMLESS HEAT NO. XXXX |
| Certification & Test Reports | Manufacturer Test Certificate 100% Radiography Test Report Raw Materials Certificate Third Party Inspection Report Moisture Testing Heat Treatment Charts Surface Roughness Measurement HS Code Commercial Invoice DFARS Compliant EN 10204/3.1B, EN 10204 3.1 and 3.2 Material Test Certificates (MTC) Fumigation Certificates Laboratory Test Certificate from Govt. Approved Lab Form A for Generalized System of Preferences (GSP) |
| Testing & Corrosion Impact Test | Detailed as part of: – Radiography Test – Third Party Inspection – Moisture Testing – Surface Roughness Measurement – Heat Treatment Documentation |
Price List & Stock Availability of Alloy 20 Pipe & Tube in India
Explore the current pricing and stock availability of Alloy 20 Pipes and Tubes in India:
| Origin | Price in INR (per kg) | Price in USD (per kg) | Price in Euro (per kg) | Stock |
| Indian | Rs 1300/- | $18 | €16 | Cut to Size |
Why Choose Stellar Alloys for Alloy 20 Pipe & Tube Supply?
Stellar Alloys is the trusted choice for Alloy 20 Pipe & Tube supply, known for delivering top-quality materials that meet stringent industry standards. With extensive expertise in metal manufacturing and a commitment to customer satisfaction, Stellar Alloys offers competitive pricing, prompt delivery, and customized solutions tailored to client specifications. Our robust quality assurance and technical support make us a reliable partner for all Alloy 20 requirements, ensuring durability and performance in demanding applications.
Frequently Asked Questions About Alloy 20 Pipe & Tubing
Alloy 20 pipe is a nickel-iron-chromium austenitic alloy enriched with copper and molybdenum. It offers excellent resistance to sulfuric acid, pitting, and chloride stress corrosion cracking, making it ideal for aggressive chemical environments.
Prices vary by region, supplier, and form. In India, Alloy 20 tubes typically run around INR 1,300 per kg. Prices in the USA and Europe are higher, often $24–27 per kg or €20–23 per kg, based on order size and specifications.
Alloy 20 is used in chemical processing vessels, heat exchangers, piping systems, and storage tanks. It excels in sulfuric, phosphoric, and nitric acid service, as well as environments prone to chloride stress corrosion and pitting.
Alloy 20 is known as UNS N08020, Incoloy 20, and EN 1.4529. These designations are interchangeable across ASTM, ASME, and EN standards for the same nickel-iron-chromium alloy formulation.
Alloy 20 cast material is a cast version of the nickel-iron-chromium Alloy 20, produced via sand or investment casting. It retains the same chemical composition and corrosion-resistance properties as wrought Alloy 20, suitable for complex shapes.
