This standard outlines the specifications for mild steel sheets and strips in coil form, produced through hot rolling. These materials are intended for use in the production of cold reduced tinplate and cold reduced blackplate.

Material that meets this standard should be provided in coil form, usually with a thickness of 1.8 mm or more, and widths of 600 mm or wider. Given the diverse finishes and other attributes needed for the eventual cold reduced product, the surface quality is of utmost significance.

When specific characteristics are needed for the final product, the manufacturer and reroller must mutually agree on the specifications of the hot-rolled sheet/strip when placing the order. Sheets/strips slit to widths below 600 mm from wide coils can be regarded as sheet/strip coils for rerolling purposes. The general requirements for supplying hot rolled mild steel sheet and strip for producing cold reduced tinplate and blackplate shall comply with the specified standards.

The steel should be manufactured through processes like open hearth, electric furnace, duplex furnace, basic oxygen furnace, or a combination thereof. Its chemical composition must adhere to standard specifications. Sheets and strips should be largely free from laminations, seams, cracks, rolled-in oxides, inclusions, and other detrimental defects that could impact subsequent processing. They should be supplied either in hot rolled condition or hot rolled, pickled, and oiled.

PACKING AND MARKING:

Sheets and strips must be tightly coiled, with one edge positioned above the other. The protrusion of material from the edges should not exceed 5% of the width of the sheet or strip. For sheets and strips wider than 800 mm, a maximum projection of 40 mm is allowed. It's important to note that edge projection is not permitted on both sides of the coils.

Coils should be securely packed using high-tensile steel strappings, which are tightly tied around the circumference and across each coil.

Every sheet or strip coil must be clearly marked with the following details:

• Manufacturers name or trade mark

• Coil number

• Coil mass

• Product Dimensions

• Order number

Manufacturers have the option to apply the ISI mark to the material. To use the standard mark (ISI Mark), they must 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 by the Bureau.

PROCESS FOR BIS ISI MARK CERTIFICATION