What Is ASTM B564? Forged Nickel Alloy
Key Grades and Properties
| B564 Alloy | UNS | Common Name | Tensile (min) | Yield (min) | Key Resistance |
|---|---|---|---|---|---|
| N06625 | N06625 | Inconel 625 | 827 MPa (120 ksi) | 414 MPa (60 ksi) | Sour gas, seawater, acids |
| N07718 | N07718 | Inconel 718 | 1241 MPa (180 ksi) | 1034 MPa (150 ksi) | High strength + corrosion |
| N04400 | N04400 | Monel 400 | 483 MPa (70 ksi) | 172 MPa (25 ksi) | HF acid, seawater |
| N10276 | N10276 | Hastelloy C-276 | 690 MPa (100 ksi) | 283 MPa (41 ksi) | Wet chlorine, mixed acids |
| N08825 | N08825 | Incoloy 825 | 586 MPa (85 ksi) | 241 MPa (35 ksi) | Sulfuric/phosphoric acid |
| N08020 | N08020 | Alloy 20 | 551 MPa (80 ksi) | 241 MPa (35 ksi) | Sulfuric acid |
| N06600 | N06600 | Inconel 600 | 552 MPa (80 ksi) | 241 MPa (35 ksi) | High temp oxidation, caustic |
| N06022 | N06022 | Hastelloy C-22 | 690 MPa (100 ksi) | 310 MPa (45 ksi) | Universal corrosion resistance |
When to Specify B564 Forgings
ASTM B564 forgings are specified when stainless steel and duplex grades lack the corrosion resistance or high-temperature capability for the service environment:
- Sour gas production: Inconel 625 flanges for wellhead and flowline connections per NACE MR0175
- HF alkylation units: Monel 400 flanges and fittings for hydrofluoric acid service
- Chemical reactors: Hastelloy C-276 flanges for wet chlorine gas, ferric chloride, and mixed acids
- Sulfuric acid plants: Alloy 20 flanges for hot dilute and intermediate-concentration sulfuric acid
- Subsea production: Inconel 625 and 718 compact flanges and clamp connectors
Pairing with Cast and Pipe Specifications
| B564 Forging | Cast Equivalent (A494) | Pipe Specification |
|---|---|---|
| Inconel 625 | CW-6MC | B444 (seamless pipe) |
| Inconel 718 | - | B637 (bars/forgings) |
| Monel 400 | M-35-1 | B165 (seamless pipe) |
| Hastelloy C-276 | CW-12MW | B622 (seamless pipe) |
| Incoloy 825 | CU5MCuC | B423 (seamless pipe) |
| Alloy 20 | CN7M | B729 (seamless pipe) |
Testing and Quality
ASTM B564 requires solution annealing (grade-specific temperatures), chemical analysis, and tensile testing. Mill test certificates per EN 10204 3.1 or 3.2 must document full chemistry, mechanical properties, and heat treatment records. NDT typically includes ultrasonic examination per ASME SA-388 and liquid penetrant inspection. Hydrostatic testing follows the applicable flange standard (ASME B16.5, B16.47) or valve standard. Intergranular corrosion testing per ASTM G28 is commonly required. The forging process for nickel alloys requires higher forging temperatures and forces than steel, with procurement lead times typically 16-30 weeks.
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