ASTM B473 Alloy 20 UNS N08020 Round Bar
Alloy 20 (UNS N08020 / W.Nr. 2.4660) round bar and rod are supplied as nickel-iron-chromium alloy developed for sulfuric-acid and chemical-process service, with copper and molybdenum additions. Dimensions, condition, testing and documentation are reviewed before quotation.
Final suitability depends on the medium, concentration, temperature, stress, fabrication route and governing design code.
Alloy 20 Round Bar Specification
| Alloy / UNS | Alloy 20 / N08020 |
|---|---|
| Werkstoff / EN | 2.4660 / NiCr20CuMo |
| Product standard | ASTM B473 / ASME SB-473 |
| Forms | Round bar, rod, bright bar, peeled bar, ground bar and cut pieces |
| Diameter | Common supply range 6–200 mm; other sizes subject to mill capability |
| Condition | Hot finished, cold finished, annealed or solution treated, peeled, ground or polished as specified |
| Documentation | Material test certificate and heat-number traceability as ordered |
Available Bar Forms and Processing
| Form | Processing | Order information |
|---|---|---|
| Hot-finished bar | Hot worked, heat treated and descaled or turned | Size, allowance, surface and inspection |
| Cold-finished bar | Cold drawn, peeled, ground or polished | Tolerance, straightness and roughness |
| Cut pieces | Sawn or machined blanks | Length tolerance, marking and traceability |
Equivalent Designations
| Commercial designation | UNS | Werkstoff | EN designation |
|---|---|---|---|
| Alloy 20 | N08020 | 2.4660 | NiCr20CuMo |
Chemical Composition
| Ni | Cr | Fe | Cu | Mo | Nb + Ta | C | Mn |
|---|---|---|---|---|---|---|---|
| 32.0–38.0 | 19.0–21.0 | Balance | 3.0–4.0 | 2.0–3.0 | 8×C–1.0 | 0.07 max | 2.0 max |
Values are weight percent; final acceptance follows the ordered standard edition and material test certificate.
Mechanical and Physical Properties
| Property | Value / requirement | Purchasing note |
|---|---|---|
| Tensile strength | ≥ 551 MPa (80 ksi), subject to condition | Confirm ordered size and condition |
| 0.2% yield strength | ≥ 241 MPa (35 ksi), subject to condition | Confirm ordered size and condition |
| Elongation | ≥ 30%, subject to standard requirements | Confirm ordered size and condition |
| Density | Approx. 8.08 g/cm³ | Confirm ordered size and condition |
Heat Treatment, Machining and Fabrication
| Heat treatment | Condition and cooling practice follow the governing specification and required properties. |
|---|---|
| Machining | Use suitable tooling and positive feeds; state machining allowance and final surface. |
| Welding / fabrication | Use qualified procedures and compatible consumables selected for the service condition. |
| Clean handling | Avoid contamination for corrosion-critical and high-purity applications. |
Inspection and Quality Documentation
| Identity | Heat number and PMI when ordered |
|---|---|
| Tests | Chemical and mechanical results on the material test certificate |
| Dimensions | Diameter, length, straightness and surface inspection |
| NDT | Ultrasonic or other testing subject to order requirements |
Alloy 20 Round Bar Applications
| Industry | Components | Selection focus |
|---|---|---|
| Sulfuric-acid processing | Pump shafts, valve stems and fasteners | Alloy chemistry developed for acid service |
| Pharmaceutical production | Machined and fabricated components | Corrosion resistance in suitable process environments |
| Food and chemical equipment | Mixer shafts and valve components | Combination of corrosion resistance and fabricability |
Alloy 20 Round Bar Packaging
Bars are protected according to size, surface, package weight, route and customer specification.
| Condition | Protection | Confirmation |
|---|---|---|
| Hot-finished | Bundle, skid or wooden support | Weight and lifting points |
| Ground / polished | Separators and waterproof wrapping | Surface and moisture protection |
| Cut pieces | Blocked wooden case | Count and traceability |
Procurement Confirmation
State Alloy 20 / UNS N08020, standard edition, diameter, length, quantity, condition, tolerance, surface, testing, marking, packing and certificate requirements.
ASTM B473 Alloy 20 UNS N08020 Round Bar Product Images
These product images show ASTM B473 Alloy 20 UNS N08020 Round Bar form, surface condition and workmanship for visual verification before shipment.
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