This standard outlines the criteria for chrome molybdenum steel bars and rods utilized in aircraft applications.

Unless stated otherwise in the order, forging bars and rods should be provided in rolled or forged form. The steel must be manufactured using either an acid or basic open hearth or electric furnace process. It should be of high quality, appropriate for crafting aircraft components that will undergo magnaflux or any other approved inspection procedure.

The material must be flawless, consistent in quality and condition, devoid of pipes, laps, cracks, twists, seams, or any defects that could hinder part fabrication or performance. Cold-finished bars and rods must be entirely free from scale and surface flaws. All bars and rods must originate from rough-machined or ground ingots or blooms, or be rough-machined or ground themselves. The steel's chemical composition should adhere to the standard specifications. Physical and mechanical properties must meet prescribed standards. The product must undergo testing as per the specifications.

MARKING

The manufacturer should mark the material to ensure traceability of all finished steel back to the original cast, and for heat-treated material, back to the respective heat treatment batch.

To utilize the standard mark (ISI Mark), the manufacturer needs to acquire a BIS license from the Bureau of Indian Standards. This license is granted following a thorough evaluation of manufacturing infrastructure, production processes, and quality control and testing capabilities during an on-site visit to the manufacturing premises.

PROCESS FOR BIS ISI MARK CERTIFICATION