ASTM B446 Technical Specification for Nickel Alloys
The ASTM B446 standard defines strict requirements for the production and quality of wrought products, including forgings and bars made from high-alloy nickel-chromium-molybdenum alloys: nickel-chromium-molybdenum-columbium (UNS N06625), nickel-chromium-molybdenum-silicon (UNS N06219), and nickel-chromium-molybdenum-tungsten (UNS N06650). Products supplied by EV Group China fully comply with these standards to ensure reliability under critical operating conditions.
For the UNS N06625 alloy, a classification into two grades is provided, depending on the heat treatment regime:
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Grade 1 (annealed condition): material is intended for service at temperatures not exceeding 1100 °F (593 °C).
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Grade 2 (solution annealed): products are optimized for high-temperature operation above 1100 °F (593 °C), providing increased creep resistance and structural stability under long-term loads.
Important note: hot working temperatures and re-annealing parameters directly affect the physical and mechanical characteristics of the alloy.
UNS N06219 and UNS N06650 alloys are supplied exclusively in the solution-annealed condition. EV Group China guarantees strict adherence to manufacturing processes for every batch of products.
The standard establishes values in the inch-pound system as the base, while SI values are provided for reference. Safety issues when handling materials should be governed by the current Material Safety Data Sheets (MSDS) from the manufacturer.
Technical Notes:
- The specification is relevant for equipment operating under pressure (boilers, vessels) according to ASME, Section II, specification SB-127.
- Identification of alloys corresponds to the UNS system according to ASTM E527 and SAE J1086.