Table of Contents
- Alloy 20 (ASTM B473 UNS N08020) Overview
- Technical Specifications
- Chemical Composition & Mechanical Properties
- Types of Alloy 20 Hex Bars
- Key Advantages of Alloy 20 Hex Bars
- Key Applications of Alloy 20 Hex Bars
- Quality Assurance & Inspection
- Global Export Markets
- Frequently Asked Questions
- Contact Aurum Overseas
Alloy 20 (ASTM B473 UNS N08020) Overview
Stabilized with niobium and enriched with 32–38% nickel plus 3–4% copper, Alloy 20 Hex Bars offer superior resistance to hot sulfuric acid and intergranular corrosion. Aurum Overseas is a trusted Alloy 20 Hex Bars Supplier and ASTM B473 UNS N08020 Hex Bars Supplier, stocking premium solution-annealed hexagon inventory for immediate dispatch.
As a leading Alloy 20 Hex Bars Exporter and ASTM B473 UNS N08020 Hex Bars Exporter, we supply high-precision Alloy 20 Bright Hex Bars for fast CNC machining alongside heavy-duty Alloy 20 Forged Hex Bars for high-pressure valve bodies. Every batch undergoes strict testing to guarantee zero intergranular attack in aggressive acid streams.
We deliver fully certified ASTM B473 and ASME SB473 hex stock directly to chemical plants, pickling lines, and fertilizer facilities across the USA, UK, Germany, UAE, Saudi Arabia, and worldwide markets. Contact us today for competitive pricing and instant mill test certificates.
Technical Specifications
| Technical Parameter | Specification Standard |
|---|---|
| Material Specifications | ASTM B473, ASME SB473, ASTM B462, EN 10088-3 |
| UNS Designation | UNS N08020 |
| Across-Flats (AF) Size Range | 6.0 mm to 100.0 mm (1/4" to 4" Hexagon) |
| Length Options | 1,000 mm to 6,000 mm, Precision Sawing Cut-to-Length |
| Surface Finishes | Cold Drawn, Centerless Ground, Bright Annealed, Hot Forged |
| Heat Treatment Condition | Stabilized Solution Annealed (925 °C to 1010 °C, Water Quench) |
| Dimensional Tolerances | ASTM B473 / ISO 286-2 (h9, h10, h11 hex profile tolerances) |
| HSN Code | 72042190 |
Chemical Composition & Mechanical Properties
Equivalent Standards
| Standard / Grade | Werkstoff Nr. | UNS Designation | EN Standard |
|---|---|---|---|
| Alloy 20 | 2.4660 | N08020 | NiCr20CuMo |
Chemical Composition (%)
| Element | Specification Range (UNS N08020) |
|---|---|
| Carbon (C) | 0.02 max |
| Nickel (Ni) | 32.0 – 38.0 |
| Chromium (Cr) | 19.0 – 21.0 |
| Copper (Cu) | 3.0 – 4.0 |
| Molybdenum (Mo) | 2.0 – 3.0 |
| Manganese (Mn) | 1.0 – 2.0 |
| Silicon (Si) | 0.70 max |
| Sulfur (S) | 0.005 max |
| Iron (Fe) | Balance |
Mechanical & Physical Properties
| Property Parameter | Metric Units | Imperial / Standard Units |
|---|---|---|
| Density | 8.1 g/cm³ | 0.292 lb/in³ |
| Melting Point Range | 1443 °C | 2430 °F |
| Tensile Strength (Min) | 551 MPa | 80 ksi |
| Yield Strength (0.2% Offset, Min) | 241 MPa | 35 ksi |
| Elongation (Min) | 30 % | 30 % |
Types of Alloy 20 Hex Bars
Aurum Overseas supplies Alloy 20 (UNS N08020) hex bars in precision bright and heavy forged conditions for sulfuric acid service.
ASTM B473 UNS N08020 Bright Hex Bars
ASTM B473 UNS N08020 Forged Hex Bars
Key Advantages of Alloy 20 Hex Bars
Hot Sulfuric Acid Immunity
Balanced 32–38% nickel and 3–4% copper formulation resists general corrosion in boiling 20% to 40% concentration sulfuric acid.
Welding Sensitization Protection
Niobium stabilization ties up free carbon, eliminating intergranular corrosion in welded heat-affected zones.
Chloride Stress Corrosion Defense
High-nickel matrix provides superior protection against stress corrosion cracking in environments with dissolved chlorides.
Pitting & Crevice Defense
Combined chromium and molybdenum content prevents localized corrosion under tight valve seats and gaskets.
Key Applications of Alloy 20 Hex Bars
| Industry | Applications | Operational Benefit |
|---|---|---|
| Sulfuric Acid Production | Acid pump shafts, dilution mixer bolts, hex plugs | Prevents surface recession and wall thinning in hot acid streams. |
| Chemical Processing | Synthetic rubber agitator shafts, polymer valve stems | Delivers high mechanical strength and reliable operation under acidic thermal cycles. |
| Metal Pickling Lines | Pickling rack fasteners, heat exchanger tie rods | Resists degradation from blended sulfuric and nitric acid wash solutions. |
| Phosphate Fertilizer Manufacture | Evaporator valve fittings, reaction tank hex nuts | Prevents severe crevice attack under wet slurry deposits and acidic liquors. |
Quality Assurance & Inspection
As a professional Alloy 20 Hex Bars Exporter and ASTM B473 UNS N08020 Hex Bars Exporter, Aurum Overseas enforces rigorous Quality Management System (QMS) protocols on every shipment:
- Positive Material Identification (PMI): 100% XRF testing to confirm exact 32–38% nickel, 19–21% chromium, and 3–4% copper concentration.
- Corrosion Testing: Intergranular corrosion testing per ASTM A262 Practice B (Ferric Sulfate-Sulfuric Acid Test).
- Mechanical Validation: Tensile, 0.2% proof yield stress, and elongation testing strictly per ASTM B473 requirements.
Global Export Markets
As an established Alloy 20 Hex Bars Exporter, Aurum Overseas supplies fully certified ASTM B473 UNS N08020 Hex Bars to global chemical processing, pickling, and fertilizer 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 combines 32–38% nickel with 3–4% copper, creating a passive surface film that resists general attack across medium-concentration sulfuric acid lines at elevated process temperatures.
Niobium acts as a stabilizing element by binding available carbon into inert niobium carbides, preventing chromium depletion along grain boundaries during welding.
Cold drawn Alloy 20 bright hex bars are manufactured to h9, h10, and h11 ISO tolerances per ASTM A484, ensuring exact fit-up in automated CNC lathes.
Contact Aurum Overseas
Partner with a trusted Alloy 20 Hex Bars Supplier and global ASTM B473 UNS N08020 Hex Bars Exporter for certified alloy stock, custom cut-to-length sawing, and rapid international delivery.