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Alloy 20 Threaded Bars Overview
Aurum Overseas is a trusted Alloy 20 Threaded Bars Supplier & Exporter, stocking high-nickel austenitic alloy fasteners manufactured to ASTM B473 standards. Engineered primarily to withstand hot sulfuric acid exposure, these studs deliver superior stress corrosion cracking resistance compared to standard 300-series stainless steels.
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Our inventory includes certified ASTM B473 UNS N08020 Threaded Bars containing 32.00–38.00% Nickel, 19.00–21.00% Chromium, 3.00–4.00% Copper, and Niobium stabilization. This chemical balance gives Carpenter 20 Threaded Rods exceptional stability against intergranular corrosion during welding and acid immersion.
Built for chemical pickling tanks, acid production lines, and pharmaceutical reactors, our UNS N08020 Threaded Rods deliver leak-tight flanged joints. Contact Aurum Overseas for direct factory quotes, custom length sawing, and fast global delivery.
Technical Specifications
| Technical Parameter | Specification Standard |
|---|---|
| Material Specifications | ASTM B473, ASME SB473, EN 10204 3.1 |
| UNS Designation | UNS N08020 (Alloy 20 / Carpenter 20) |
| Thread Size Range | M6 to M100 (1/4" to 4.0" Nominal Diameter) |
| Thread Profiles | UNC, UNF, UNEF, Metric Coarse, Metric Fine, Acme Threads |
| Length Options | 1,000 mm, 2,000 mm, 3,000 mm, Custom Cut-to-Length All-Thread Studs |
| Thread Class / Fit | Class 2A / 3A (Imperial) & 6g / 6h (Metric Profile Tolerances) |
| HSN Code | 75089090 |
Chemical Composition & Mechanical Properties
Equivalent Standards
| Grade | Standard | W.Nr. | UNS | EN | AFNOR |
|---|---|---|---|---|---|
| Alloy 20 | ASTM B473 | 2.4660 | N08020 | NiCr20CuMo | Z2NCUD31-20AZ |
Chemical Composition (%)
| Chemical Element | Alloy 20 (UNS N08020) |
|---|---|
| Nickel (Ni) | 32.00 – 38.00 |
| Iron (Fe) | 29.85 min |
| Chromium (Cr) | 19.00 – 21.00 |
| 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 |
Mechanical & Physical Properties
| Property Parameter | Alloy 20 (UNS N08020) |
|---|---|
| Density | 8.10 g/cm³ |
| Melting Point | 1443 °C (2430 °F) |
| Tensile Strength (Min) | 551 MPa (80,000 Psi) |
| Yield Strength (0.2% Offset, Min) | 241 MPa (35,000 Psi) |
| Elongation (Min) | 30 % |
Key Advantages of Alloy 20 Threaded Rods
Sulfuric Acid Defense
Built-in 3–4% Copper prevents rapid metal loss in hot sulfuric acid, pickling baths, and acidic chemical solutions.
Welding Protection (No Carbide Decay)
Niobium stabilization keeps grain boundaries strong during welding, preventing post-weld acid attack.
Resists Stress Cracking
High 32–38% Nickel content stops studs from cracking under heavy loads in warm chloride and chemical environments.
Multi-Acid Versatility
Performs reliably across mixed chemical lines, handling phosphoric, nitric, and organic acids without localized pitting.
Quality Testing & Inspection
Aurum Overseas subjects every order to full Quality Assurance protocols to ensure full compliance with international fastener standards and client specifications:
- Positive Material Identification (PMI): Spectro / XRF analysis confirming exact elemental composition per ASTM B473 specifications.
- Dimensional & Thread Pitch Inspection: Go/No-Go gage testing and optical comparator checks ensuring exact 2A/3A and 6g thread fit tolerances.
- Mechanical Batch Testing: Tensile strength, yield strength, and elongation verification certified via EN 10204 3.1 Material Test Reports.
- Optional Specialized Testing: Corrosion testing (ASTM A262 Practice E), hardness verification, or NDT testing upon customer request.
Global Export Markets
As an established Alloy 20 Threaded Bars Exporter, Aurum Overseas supplies fully certified ASTM B473 UNS N08020 threaded rods to global chemical, pharmaceutical, and industrial facilities:
USA
Canada
Mexico
Germany
United
Kingdom
France
Italy
Netherlands
Belgium
Spain
Poland
UAE
Saudi
Arabia
Qatar
Kuwait
Oman
Bahrain
Frequently Asked Questions
Alloy 20 contains 3% to 4% Copper along with 32% to 38% Nickel and 2.0% to 3.0% Molybdenum, creating a matrix that resists sulfuric acid attack across a wide range of temperatures and concentrations.
Carpenter 20 is the trade name originally developed for this nickel-iron-chromium alloy, while UNS N08020 is its unified numbering system designation covered under ASTM B473 specifications.
Niobium binds with carbon to prevent chromium carbide precipitation at grain boundaries during welding, ensuring high resistance to intergranular corrosion.
Yes. As an Alloy 20 Threaded Bars Exporter, we supply orders across the UAE, Saudi Arabia, Qatar, Oman, Kuwait, and Bahrain.
Yes. We supply ASTM B473 UNS N08020 Threaded Bars to chemical, pharmaceutical, and industrial buyers across the USA, Canada, Germany, the UK, and Europe.
Contact Aurum Overseas
Contact Aurum Overseas, a premier Alloy 20 Threaded Bars Supplier & Exporter, for certified ASTM B473 threaded rods, cut-to-length studs, and fast global shipping.