This standard delineates the technical and delivery parameters for plain carbon and low alloy grade steels, presented as bars, billets, and various other shapes, manufactured through a continuous cast route, either by rolling or forging.

The steels addressed in this standard are typically utilized as raw materials by the forging industry for manufacturing automobiles or other engineering components.

Material supply must adhere to the general requirements outlined in IS 1387:1967. The reduction ratio from the cast product to the forging stock should be a minimum of 6:1. The standard mandates that the stock must be devoid of any detrimental internal defects. However, for particular applications, higher or lower reduction ratios can be mutually agreed upon between the purchaser and the manufacturer during the inquiry and ordering process.

The continuously cast steel stock, whether rolled or forged, must be devoid of detrimental surface and subsurface defects that could compromise the steel's forgeability or suitability for end-use. Prior to rolling, the continuously cast billet or bloom must undergo appropriate conditioning measures to guarantee product quality.

Continuously cast steel that is rolled or forged must also be devoid of detrimental internal defects, including corner cracks, half-way cracks, center looseness, concentrated pinholes, voids, flakes, and similar issues.

The hardness and mechanical properties corresponding to each grade will adhere to the relevant Indian standard designated for the specific steel application. Rigorous hardness and mechanical tests are conducted to guarantee the quality of the product.

The chemical composition, mechanical properties, and grain size must align with the specifications outlined in the standard. Foreign stock rolled from continuously cast products must adhere to stringent surface quality standards, while size tolerances should comply with 3739:1987.

MARKING

Marking procedures must adhere to IS 13352:1992 guidelines. Additionally, the material may bear the standard mark (ISI Mark), which is mandatory. To utilize the standard mark (ISI Mark), the manufacturer must acquire a BIS license from the Bureau of Indian Standards. This license is granted following a thorough assessment of manufacturing infrastructure, quality control measures, testing capabilities, and the manufacturing process.

PROCESS FOR BIS ISI MARK CERTIFICATION