What is ASTM B443?
ASTM B443 is an ASTM international standard specification for nickel-chromium-molybdenum-niobium alloy (Inconel 625) and nickel-chromium-molybdenum-silicon alloy (UNS N06219) plate, sheet, and strip. This standard covers two grades: Grade 1 (annealed) for lower temperatures, and Grade 2 (solution annealed) for higher temperatures requiring creep resistance, thus ensuring the material quality of critical components.
ASTM B443 Scope
You find four main product types covered by ASTM B443. Each type serves a different purpose in manufacturing and engineering. The table below helps you see the differences:
| Product Type | Description |
|---|---|
| Sheet | Thinner, made by cold rolling for precise uses. |
| Plate | Thicker, made by hot rolling for heavy tasks. |
| Coil | Formed for specific applications. |
| Strip | Thinner, suitable for detailed work. |
What is ASTM A433 Inconel 625 Plate and Sheet Specifications?
ASTM B443 UNS N06625 is the standard specification for UNS N06625, commonly known as Inconel 625. This alloy is supplied in plate, sheet, and strip forms and possesses excellent corrosion resistance, high strength, and good high-temperature properties, making it ideal for applications in aerospace, marine, and chemical industries. It is available in two grades: Grade 1 (annealed), suitable for temperatures up to 1100°F; and Grade 2 (solution annealed), suitable for applications requiring higher temperatures and demanding creep and fracture resistance.
ASTM A433 Inconel 625 Plate Chemical Composition
ASTM A433 Inconel 625 (UNS N06625) plate is a high-strength, corrosion-resistant nickel-chromium-molybdenum alloy, primarily composed of Nickel (balance, min 58%), Chromium (20-23%), Molybdenum (8-10%), and Niobium+Tantalum (3.15-4.15%), with controlled limits on Iron (max 5%), Carbon (max 0.10%), Manganese (max 0.50%), Silicon (max 0.50%), Sulfur (max 0.015%), Phosphorus (max 0.015%), Aluminum (max 0.40%), Titanium (max 0.40%), and Cobalt (max 1.0%).
Inconel 625 Plate Physical Properties
| Property | Metric | Imperial |
|---|---|---|
| Hardness, Rockwell B (typical annealed) | 95 | 95 |
| Tensile strength (for flat products <4″ thickness) | ≥ 827 MPa | ≥ 120,000 psi |
| Yield strength (for flat products <4″ thickness) | ≥ 414 MPa | ≥ 60,000 psi |
| Elongation at break (typical annealed) | 45% | 45% |
Inconel 625 Plate Mechanical Properties
| Property | Inconel 625 | Inconel 600 |
|---|---|---|
| Tensile Strength | Psi – 135,000 , MPa – 930 | Psi – 95,000 , MPa – 655 |
| Yield Strength (0.2% Offset) | Psi – 75,000 , MPa – 517 | Psi – 45,000 , MPa – 310 |
| Elongation | 42.5 % | 40 % |
Inconel 625 Plate Thickness Tolerances
| Thickness (inch) | Permissible Variation (inches) |
|---|---|
| 0.625 | 2 to 2-3/4 |
| 1.5 | 1/4 to 3/8 |
| 1.125 | 1 to 2 |
| 1.125 | 1/2 to 3/4 |
| 2.125 | 3/16 to 1/4 |
| 1.125 | 3/8 to 1/2 |
| 1.125 | 3/4 to 1 |
ASTM A433 Inconel 625 Plate Thickness, Width, Length
| Category | Thickness Range | Width Range | Length Options |
|---|---|---|---|
| Inconel 625 Plate | 3.0–10.0 mm (Hot rolled), 0.5–6.4 mm (Cold rolled) | Up to 500 mm (19.5 in) | 1000 x 2000 mm, 1220 x 2440 mm, 1500 x 3000 mm, 2000 x 2000 mm, 2000 x 4000 mm |
| Inconel 625 Foil | 8–100 microns (0.00031–0.004 in) | Up to 500 mm (19.5 in) | N/A |
You can also find plates in larger sizes:
| Category | Thickness Range | Width Range | Length Options |
|---|---|---|---|
| Inconel 625 Plates | 0.1 mm–100 mm | 10 mm–2500 mm | 2.44 m, 2 m, 3 m, or as required |
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