Table of Contents
- Alloy 20 Round Bars Overview
- Technical Specifications
- Mechanical Properties & Chemical Composition
- Types of Alloy 20 Round Bars
- Key Advantages of ASTM B473 UNS N08020 Round Bars
- Key Applications of Alloy 20 Round Bars
- Quality Testing & Inspection
- Global Export Markets
- Frequently Asked Questions
- Contact Aurum Overseas
Alloy 20 Round Bars Supplier & Exporter
Aurum Overseas is a leading Alloy 20 Round Bars Supplier offering ready-to-ship ASTM B473 UNS N08020 Round Bars built to withstand severe chemical environments. Our Carpenter 20 Round Bars eliminate stress cracking and corrosion failure in hot sulfuric acid applications—protecting your equipment, preventing costly downtime, and maximizing long-term performance.
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As a trusted Alloy 20 Round Bars Exporter, we maintain ready inventory of certified ASTM B473 UNS N08020 Round Bars complete with EN 10204 3.1 Mill Test Certificates. Our product line includes precision centerless ground bright bars, hot-forged rounds, and custom cut-to-length options tailored to exact engineering blueprints.
We export certified Carpenter 20 Round Bars worldwide with fast dispatch to major industrial hubs across North America, Europe, the Middle East, and Asia-Pacific, including the USA, Germany, UAE, Saudi Arabia, Singapore, and Australia.
Technical Specifications
| Technical Parameter | Alloy 20 (UNS N08020) |
|---|---|
| Material Designation | Alloy 20 / Carpenter 20 / 20CB-3 |
| UNS Number | UNS N08020 |
| Manufacturing Standards | ASTM B473, ASME SB473, EN 10204 3.1 |
| Diameter Capability | 3 mm to 500 mm (1/8" to 20" NB) |
| Length Specifications | 3 Meters, 6 Meters, Cut-to-Length |
| Dimensional Tolerances | ISO h8, h9, h10, h11, DIN 1013 |
| Delivery Conditions | Solution Annealed (955°C to 1065°C) & Water Quenched |
Mechanical Properties & Chemical Composition
Equivalent Grades of Alloy 20 Bars
| Standard | UNS | EN | Werkstoff Nr. |
|---|---|---|---|
| Alloy 20 | N08020 | NiCr20CuMo | 2.4660 |
Chemical Composition of Alloy 20 Round Bars
| Chemical Element | Composition Range (%) |
|---|---|
| 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 |
Mechanical Properties of Carpenter 20 Round Bars
| Property | Value |
|---|---|
| Ultimate Tensile Strength | 551 MPa (80,000 Psi) min |
| Yield Strength (0.2% Offset) | 241 MPa (35,000 Psi) min |
| Elongation (%) | 30% min |
| Density | 8.1 g/cm³ |
| Melting Point | 1443 °C (2430 °F) |
Types of Alloy 20 Round Bars
Aurum Overseas supplies ASTM B473 Alloy 20 Round Bars in precision bright and heavy forged conditions for acid processing service.
Alloy 20 Bright Bars
Alloy 20 Forged Bars
Key Advantages of ASTM B473 UNS N08020 Round Bars
Sulfuric Acid Resistance
High copper (3–4%) and molybdenum (2–3%) additions protect equipment operating in boiling 20% to 40% concentration sulfuric acid solutions.
No Intergranular Corrosion
Niobium (Columbium) stabilization binds free carbon, preventing chromium carbide precipitation during welding and eliminating intergranular decay.
Chloride Stress Cracking Protection
High nickel content (32–38%) stops chloride-induced stress corrosion cracking in hot chemical process streams.
Pitting & Crevice Defense
Balanced chromium (19–21%) provides robust oxidation resistance and prevents localized pitting in mixed acid media.
Key Applications of Alloy 20 Round Bars
| Industry Sector | Typical Components | Operating Conditions |
|---|---|---|
| Sulfuric Acid Production | Pump shafts, mixing agitators, and valve stems | Hot sulfuric acid streams, high flow velocities, and aggressive acid baths |
| Chemical Processing | Reactor hardware, heat exchanger shafts, and fittings | Mixed nitric/sulfuric acid media, organic chemicals, and high process heat |
| Pharmaceutical Manufacturing | Mixing shafts, process valves, and fluid agitators | Ultra-clean process streams, aggressive cleaning chemicals, and strict purity needs |
| Plastics & Synthetic Fiber | Polymerization mixing shafts and metering gear shafts | Corrosive catalysts, high viscosity liquids, and continuous process stress |
| Food & Beverage Processing | Pickling equipment shafts and acid cleaning pump stems | High-concentration food acids, sanitizing chemicals, and washdown cycles |
Quality Testing & Inspection
Every shipment of ASTM B473 UNS N08020 Round Bars supplied by Aurum Overseas undergoes strict quality verification:
- Positive Material Identification (PMI): XRF chemical analysis verifies correct ratios of nickel (32–38%), chromium (19–21%), copper (3–4%), and molybdenum (2–3%).
- Corrosion Resistance Testing: Intergranular corrosion testing per ASTM A262 Practice E verifies weld-zone stability and niobium stabilization.
- Mechanical Property Testing: Tensile and yield testing confirm compliance with a minimum 551 MPa tensile strength and 241 MPa yield strength.
- Ultrasonic Examination: Full volumetric ultrasonic scanning per ASTM A388 detects subsurface voids, cracks, or forging flaws.
Global Export Markets
As an established Alloy 20 Round Bars Exporter, Aurum Overseas supplies fully certified UNS N08020 Round Bars to global chemical and process engineering centers:
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 significantly higher nickel (32–38% vs 10–14%) and added copper (3–4%), making it far superior to 316L in preventing stress corrosion cracking and resisting sulfuric acid attack.
Yes. Carpenter 20 is the trade name for the alloy standardized under UNS N08020, ASTM B473, and Werkstoff Nr. 2.4660.
Yes. Because Alloy 20 is stabilized with niobium, it resists carbide precipitation during welding, allowing it to be used in the as-welded condition without risking intergranular corrosion.
We stock diameters from 3 mm to 500 mm in centerless ground bright finishes and hot-forged conditions, available in standard 3-meter, 6-meter, or cut-to-size options.
Yes. Every order ships with complete EN 10204 3.1 Mill Test Certificates detailing heat chemistry, mechanical strength, hardness, and heat treatment compliance.
Contact Aurum Overseas
Aurum Overseas provides fully certified Alloy 20 / Carpenter 20 Round Bars engineered to meet strict acid processing requirements.
Contact our technical sales team for stock availability, cut-to-size pricing, or instant quotes: