IND/269
WTO/TBT
IN Indien
  • 77 - Metallurgie
2023-07-25
2023-05-30

Miscellaneous Steel Products

Miscellaneous Steel Products (Quality Control) Order, 2023; (2 page(s), in English)

Miscellaneous Steel Products (Quality Control) Order, 2023

·        A Bar/wire Wrapped Steel Cylinder Pipes with mortar lining: A welded steel sheet cylinder, which may be with steel socket and spigot rings welded to its ends for rubber ring joints or with steel rings welded to its ends for welded joints, lined with cement mortar centrifugally applied within the steel cylinder and spigot ring, with reinforcement consisting of continuous steel bar/wire helically wound around the outside of the cylinder and securely fastened by welding to the steel socket and spigot/ joint rings, and subsequently coated with dense cement mortar covering the steel cylinder and bar/wires except for necessarily exposed socket and spigot joints rings. Machinery required to produce these pipes includes Steel Tube mill, drainage filter wrapping plant, bale pre-processing unit, blending unit, fleece laying unit, drainage wrapping unit, and roll up unit etc.

·        High strength deformed stainless steel bars and wires for concrete reinforcement: The steel bars/ wires for concrete reinforcement are manufactured by the process of hot rolling followed by a suitable method of cold working and or in-line controlled cooling.

·        Steel Pipe Flanges: Forged flanges are manufactured by heating steel billets, slabs, or other metal stock, then compressing the material using a power hammer, press, or die to shape the flange from a solid state. This process develops a continuous grain flow for improved strength.

·       Stainless steel tubes for the food and beverage industry: There are three main methods of manufacturing stainless steel tubes i.e. Seamless, Electric resistant welded (ERW) and Drawn over mandrel (DOM) process. Seamless steel tubes are produced through extrusion. Extruded tubes can be formed in a hot or cold process. Electric resistant welded method involves passing a rolled sheet of steel through two weld rollers. The weld rollers have a groove around their circumference, through which the steel roll passes. There is a contact at the roll seam that transmits electricity at a high enough current to weld the seam closed. The resulting weld is very small. In Drawn over mandrel (DOM) process, a mandrel is a small piece of metal inserted into the tube to define a shape. It gives the tube extra support to prevent unwanted wrinkling during drawing. The tube is passed through a die that has a smaller diameter than the current tube size. As the tube is drawn, it shrinks to match the size of the die's diameter. This process allows for tight tolerances and specifications.