What is the ASTM B446 standard?
ASTM B446 is a standard specification published by ASTM International that specifies the requirements for nickel alloy bars and rods, primarily for nickel-chromium-molybdenum alloys such as the widely used UNS N06625 (Alloy 625), but also covering N06219 and N06650 alloys.
ASTM B446 equivalent material
ASTM B446 is a specification for Nickel Alloy 625, so its primary equivalent is UNS N06625, known commercially as Inconel 625, with other equivalents including Werkstoff Nr. 2.4856 (German DIN) and AMS 5666 (Aerospace Material Specification) for various forms like rods, bars, and wires. These standards all refer to the same high-strength, corrosion-resistant nickel superalloy.
What is the ASTM B446 inconel 625?
This specification covers nickel-chromium-molybdenum-niobium alloy (UNS NO6625) in the form of hot-worked and cold-worked bars, in two different heat-treated conditions: Grade 1 (Annealed): This material is typically used for applications with operating temperatures up to 1100°F (593°C). Grade 2 (Solution Annealed): This material is typically used for applications with operating temperatures above 1100°F (593°C) when creep and rupture resistance are required.
What is the composition of ASTM B446 Inconel 625?
ASTM B446 Inconel 625 is a nickel-based high-temperature alloy primarily composed of nickel (over 58%), chromium (20-23%), molybdenum (8-10%), and niobium (3.15-4.15%), and also contains certain amounts of iron (up to 5%), cobalt (up to 1%), manganese (up to 0.5%), silicon (up to 0.5%), carbon (up to 0.1%), aluminum (up to 0.4%), titanium (up to 0.4%), phosphorus (up to 0.015%), and sulfur (up to 0.015%), providing excellent corrosion resistance, strength, and high-temperature performance.
Mechanical Properties for Hot-Worked Rod and Bar and ColdWorked Rod
| Diameter or Distance Between Parallel Surfaces, in. (mm) | Tensile Strength min, ksi (MPa) | Yield Strength (0.2% offset), min, ksi (MPa) | Elongation in 2 in. or 50 mm or 4D, min, % |
|---|---|---|---|
| UNS N06625 Grade 1 (Annealed) | |||
| Up to 4 (102), incl. | 120 | 60 | 30 |
| Over 4 (102) to 10 (254), incl. | 110 | 50 | 25 |
| UNS N06625 Grade 2 (Solution Annealed) | |||
| All sizes | 100 | 40 | 30 |
| UNS N06219 All (Solution Annealed) | |||
| All sizes | 96 (600) | 39 (270) | 50 |
| UNS N06650 All (Solution Annealed) | |||
| All sizes | 116 (800) | 58 (400) |
ASTM B446 Inconel 625 round bar inspection
Tensile test specimens for ASTM B446 Inconel 625 round bars shall be taken from the material in its final condition and tested in the direction of processing. All bars and rods shall be tested using the full cross-sectional dimensions whenever possible. If full cross-sectional testing is not feasible, the largest possible circular specimen as shown in Test Method E 8 shall be used. For rectangular bars with a thickness not exceeding 1/2 inch (12.7 mm) and a width too large for full-size tensile testing, longitudinal strip specimens shall be prepared in accordance with Test Method E 8.
astm b446 vs b564
Both ASTM B446 and B564 standards cover the high-strength, corrosion-resistant 625 alloy (UNS N06625), but specify different product forms: the B446 standard applies to bars, rods, and wires, while the B564 standard applies to forgings. The B446 standard is typically used for raw materials that may subsequently be forged or machined into parts such as fasteners or pipe fittings.
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