This standard outlines the specifications for carbon-manganese steel forgings utilized in pressure vessels and components. These forgings are primarily intended for intermediate or normal temperature service, with a particular focus on weldability.

Material supply must adhere to the specifications outlined in IS 1387:1967. Forgings should be crafted from killed steel produced through primary processes such as open-hearth, basic oxygen, or electric furnace, followed by possible secondary steel production. To prevent harmful piping and segregation, adequate discards must be made from each ingot. Mechanically hot working the forgings using an appropriate process is necessary to ensure sufficient deformation throughout the sections. The forgings must be devoid of defects that compromise their utility, with only grinding allowed for surface conditioning.

TESTS

The subsequent test must be conducted for Carbon Maganese Steel Forging.

• Tensile test

• Dimensions and tolerances

• Impact test

• Ultrasonic testing

• Chemical composition

• Phosphorus content

• Manganese content

• Silicon content

PACKING AND MARKING:

Marking procedures must align with IS 12146:1987 standards. Unless specified otherwise, each forging should be clearly stamped with the grade of material, heat number or identification mark, and the manufacturer's trademark.

Forgings may also bear the Standard Mark (ISI Mark). Manufacturers are required to obtain a BIS license from the Bureau of Indian Standards to utilize the standard mark (ISI Mark). This license is granted after evaluating manufacturing infrastructure, production processes, and quality control and testing capabilities during an inspection at the manufacturing premises by the Bureau.

PROCESS FOR BIS ISI MARK CERTIFICATION