Technical requirements of the ASTM B443 standard
The ASTM B443 specification regulates requirements for flat-rolled products, including sheets, strips, and plates made of high-alloy nickel alloys, such as nickel-chromium-molybdenum-columbium (UNS N06625) and nickel-chromium-molybdenum-silicon (UNS N06219). Metal products are supplied to EV Group China in strict accordance with these standards to ensure maximum reliability in aggressive environments.
UNS N06625 rolled products are classified into two grades based on the heat treatment condition:
- Grade 1 (annealed): Intended for service at temperatures not exceeding 1100 °F (593 °C).
- Grade 2 (solution annealed): Optimized for high-temperature service above 1100 °F (593 °C), where increased creep resistance and structural stability are critical.
Technical note: Mechanical properties and material microstructure depend directly on adherence to thermal treatment temperature parameters and the purity of the alloy’s chemical composition.
The UNS N06219 alloy is supplied exclusively in the solution-annealed condition, which ensures uniformity of properties throughout the entire metal volume.
In EV Group China’s technical documentation, values in the inch-pound system (ASTM standard) are prioritized. Conversions to SI units are for reference purposes only. Industrial safety issues when using these alloys must be governed by the manufacturer’s current Material Safety Data Sheets (MSDS).
Standardization notes:
- This material complies with ASME requirements for boiler and pressure vessel construction (see specification ASME SB-443, Section II).
- Alloy grade identification is performed according to the UNS system (ASTM E527 and SAE J1086).