Table of Contents
- Alloy 20 Fasteners Overview
- Alloy 20 Fasteners Specifications
- What are Alloy 20 Nuts?
- Alloy 20 Fasteners Technical Properties & Composition
- Why Industries Prefer Alloy 20 Nuts
- Types of Alloy 20 Nuts
- Key Advantages of Alloy 20 Nuts
- Key Applications of Alloy 20 Nuts
- Quality Testing & Inspection
- Global Export Markets
- Frequently Asked Questions
- Contact Aurum Overseas
Alloy 20 Nuts Suppliers & Exporters
Aurum Overseas is a premier Alloy 20 Nuts Supplier and Alloy 20 Nuts Exporter, providing high-performance nickel-iron-chromium austenitic fasteners engineered specifically for severe sulfuric acid environments and aggressive chemical processing plants.
Manufactured in full compliance with ASTM B473 UNS N08020 Nuts standards, these specialized components—often specified as Carpenter 20 Nuts—deliver exceptional resistance to acid attack, pitting, and chloride-induced stress corrosion cracking across hot pickling, fertilizer production, and synthetic fiber processing lines.
As a worldwide Alloy 20 Nuts Exporter, Aurum Overseas distributes fully certified and traceable bolting hardware across North America (USA, Canada, Mexico), Europe (Germany, UK, France, Italy, Netherlands, Norway), the Middle East (UAE, Saudi Arabia, Qatar, Kuwait, Oman), and Asia-Pacific (Singapore, Malaysia, Australia).
Alloy 20 Fasteners Specifications
| Parameter | Specification / Technical Range |
|---|---|
| Material Grade | Alloy 20 / Carpenter 20 / Incoloy 020 / 20CB-3 |
| UNS Number | UNS N08020 |
| Werkstoff Number | 2.4660 |
| Common Trade Names | Carpenter 20 / Alloy 20 / UNS N08020 / N08020 |
| Manufacturing Standards | ASTM B473, ASME SB473, DIN 934, ISO 4032, ANSI B18.2.2 |
| Size Range | M3 to M100 | 3/16" to 4" | Custom Dimensions |
| Thread Configuration | ASME B1.1 2A/3A - 2B/3B Unified (UNC, UNF, 8UN) & B1.13M Metric |
| Nut Formats | Hex Head, Heavy Hex, Square, Lock, Slotted, Coupling, Flange Nuts |
| Testing Standards | ASTM E8, SAE J411, EN 14399, ASME B1.2, ISO 7090, DIN 125 |
What are Alloy 20 Nuts?
UNS N08020 Nuts are iron-base, nickel-chromium-molybdenum-copper fasteners engineered to bridge the performance gap between austenitic stainless steels and costly high-nickel alloys in hot sulfuric acid operations.
Manufactured per ASTM B473 UNS N08020 Nuts standards, these niobium-stabilized Carpenter 20 Nuts feature 32–38% nickel, 19–21% chromium, and 3–4% copper to prevent intergranular corrosion and maintain joint integrity in chemical skid environments.
Alloy 20 Fasteners Technical Properties & Composition
Chemical Composition of Alloy 20 Nuts (%)
| Element | Content (%) |
|---|---|
| Nickel (Ni) | 32.00 – 38.00 |
| Chromium (Cr) | 19.00 – 21.00 |
| Iron (Fe) | 29.85 min* |
| Copper (Cu) | 3.00 – 4.00 |
| Molybdenum (Mo) | 2.00 – 3.00 |
| Manganese (Mn) | 2.00 max |
| Silicon (Si) | 1.00 max |
| Carbon (C) | 0.07 max |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.035 max |
Physical & Mechanical Properties of Alloy 20
| Property / Parameter | Value |
|---|---|
| Density | 8.1 g/cm³ |
| Melting Point | 1443°C (2430°F) |
| Tensile Strength | 551 MPa / 80,000 Psi |
| Yield Strength (0.2% Offset) | 241 MPa / 35,000 Psi |
| Elongation (%) | 30% |
Equivalent Grade Standards
| Grade | Standard | Werkstoff Nr. | UNS | EN / ISO | JIS |
|---|---|---|---|---|---|
| Alloy 20 | ASTM B473 | 2.4660 | N08020 | NiCr20CuMo | NW 08020 |
Why Industries Prefer Alloy 20 Nuts
Chemical plant designers select Carpenter 20 Nuts because they offer tailored protection in 20% to 40% concentration sulfuric acid streams where standard 316L stainless steel suffers rapid wall thinning and pitting.
As an expert Alloy 20 Nuts Supplier, Aurum Overseas supplies precision-machined fasteners that combine the cost efficiency of an iron-base alloy with the stress-corrosion cracking immunity typical of higher-grade nickel alloys, ensuring reliable sealing for heat exchangers, acid pumps, and pickling tanks.
Types of Alloy 20 Nuts
Aurum Overseas supplies a comprehensive range of Alloy 20 nut configurations manufactured according to standard DIN, ASME, and ISO dimensional tolerances for multiple engineering assemblies.
Alloy 20 Hex Head Nuts
Alloy 20 Square Nuts
Alloy 20 Lock Nuts
Alloy 20 Eye Nuts
Alloy 20 Wing Nuts
Alloy 20 T Nuts
Alloy 20 Panel Nuts
Alloy 20 Coupling Nuts
Alloy 20 Dome Nuts
Key Advantages of Alloy 20 Nuts
Sulfuric Acid Resistance
Copper and molybdenum additions provide exceptional resistance to hot, middle-concentration sulfuric acid solutions.
Intergranular Corrosion Protection
Niobium stabilization prevents intergranular chromium carbide precipitation during thermal exposure.
Chloride Stress Corrosion Immunity
High nickel content (32–38%) protects joints from chloride-induced stress corrosion cracking in brackish environments.
Resistant to Pitting and Crevice Corrosion
Balanced chromium and molybdenum levels safeguard thread roots from localized pitting in stagnant liquid environments.
Cost-Effective Alloy Alternative
Delivers premium nickel alloy performance at a lower initial material cost compared to solid high-nickel grades.
Key Applications of Alloy 20 Nuts
| Industry Sector | Primary Fastener Application | Key Service Environment |
|---|---|---|
| Chemical Processing | Sulfuric acid mixing tanks, heat exchanger piping | Hot sulfuric acid solutions, nitric acid mixtures, and phosphoric acid streams |
| Petrochemical Refining | Alkylation unit bolting, acid recovery systems | Sulfuric acid catalyst media and active hydrocarbon washing streams |
| Pharmaceutical Production | Fermentation vessel flanges, batch reactor piping | Organic acids, active chemical synthesis media, and high-purity washing reagents |
| Pickling & Metal Finishing | Pickling tank structural tie-rods, rack bolting | Hot sulfuric and hydrofluoric acid pickling baths |
Quality Testing & Inspection
Aurum Overseas maintains stringent quality control protocols for every delivery as a trusted Alloy 20 Nuts Supplier and Alloy 20 Nuts Exporter.
- Chemical Verification: XRF spectrometry and PMI testing to verify exact nickel, chromium, copper, and niobium ratios.
- Mechanical Strength Testing: Room-temperature tensile, yield strength, and elongation testing according to ASTM E8 standards.
- Dimensional Precision: Thread checking and pitch diameter verification per ASME B1.2, ANSI B18.2.2, and metric ISO guidelines.
- Traceable Documentation: Complete EN 10204 3.1 Material Test Reports provided with every order, detailing heat batch numbers and chemical-mechanical compliance.
Global Export Markets
As a global Alloy 20 Nuts Exporter, Aurum Overseas supplies fully certified corrosion-resistant hardware to chemical plants, refineries, and industrial installations worldwide.
USA
Canada
Mexico
Germany
United
Kingdom
France
Italy
Netherlands
Norway
UAE
Saudi
Arabia
Qatar
Kuwait
Oman
Singapore
Malaysia
Australia
Frequently Asked Questions
Carpenter 20 Nuts incorporate a combination of 32–38% nickel, 19–21% chromium, 3–4% copper, and niobium stabilization to combat sulfuric acid attack and intergranular corrosion.
UNS N08020 Nuts are manufactured from bar stock produced in compliance with ASTM B473 UNS N08020 Nuts specifications.
Yes, Alloy 20 was developed specifically for handling sulfuric acid and performs exceptionally well across various concentration ranges and temperatures.
Niobium binds with carbon to prevent chromium carbide precipitation at grain boundaries during heating, maintaining corrosion resistance in the heat-affected zone.
Yes, as a recognized Alloy 20 Nuts Exporter, Aurum Overseas delivers certified fasteners across the Americas, Europe, the Middle East, and Asia-Pacific.
We supply Unified imperial thread series (UNC, UNF, 8UN) and Metric threads (M3 to M100) per ASME B1.1 and ISO specifications.
Yes, as a reliable Alloy 20 Nuts Supplier, every batch includes 3.1 Material Test Reports confirming full chemical analysis and mechanical property compliance.
Contact Aurum Overseas
Aurum Overseas manufactures precision Alloy 20 Nuts engineered for demanding sulfuric acid and corrosive chemical services with fast worldwide delivery options.
Contact our technical sales team today for product specifications and competitive pricing.