Nickel alloy round bars are governed by strict ASTM, ASME, and international standards depending on the specific alloy grade. Common standard specifications include ASTM B160 (for commercially pure nickel), ASTM B164 (Monel), and ASTM B446 / B637 (Inconel and high-nickel superalloys). Sizes typically range from 3 mm to 500 mm+ in diameter. [1, 2, 3, 4, 5, 6] Common ASTM / ASME Specifications by Alloy Grade • Nickel 200 / 201 (UNS N02200 / N02201): Covered under ASTM B160 / ASME SB160 for pure wrought nickel. • Monel 400 / 405 (UNS N04400 / N04405): Covered under ASTM B164 / ASME SB164. • Inconel 600 / 625 / 718 (UNS N06600 / N06250 / N07718): Covered under ASTM B166 (Alloy 600), ASTM B446 (Alloy 625/718), and ASTM B637 (precipitation-hardening versions). • Hastelloy C276 / C22 (UNS N10276 / N06022): Covered under ASTM B574 / ASME SB574. [1, 4, 5, 7, 8, 9] General Technical Parameters • Size Range: Diameters from 3 mm up to 800 mm; custom lengths up to 6 meters or more. • Condition / Finish: Hot rolled, cold drawn, forged, bright polished, rough turned, or centerless ground. • Testing & Certification: Mill Test Certificates per EN 10204 3.1, with options for Positive Material Identification (PMI) and ultrasonic testing (UT). [2, 3, 6, 10, 11, 12] If you have a specific grade (such as Inconel 625, Monel 400, or Nickel 200) or a required diameter and length, let me know so I can provide the precise chemical composition or mechanical property limits you need.