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Annealing is a heat treatment process that softens metal by reducing the internal strain caused by work hardening. This process also facilitates recrystallization and grain growth. It involves heating the metal to a specific temperature, maintaining that temperature for a certain period, and then allowing the material to cool down to room temperature. Once the annealing process is complete, the material is sent to the Cold Rolling Mill to achieve the desired thickness.
The 20-Hi (Horizontally Inserted) Cold Rolling Mill, commonly known as the Sendzimir Mill, represents the pinnacle of precision rolling technology. While standard mills struggle with extremely hard metals or ultra-thin gauges, the 20-Hi mill utilizes a complex "cluster" of rolls to achieve unmatched dimensional accuracy and material thinness.
The 4-Hi Cold Rolling Mill is the backbone of the modern metal processing industry. Designed for precision and high-volume output, the 4-Hi configuration allows us to produce high carbon steel strips with exacting thickness tolerances and superior surface finishes.
Slitting is a shearing process and it is done to cut a wider coil of High Carbon Steel Strip into a number of narrow slits as the main coil is moved through the slitter. During the slitting process, the steel strip passes lengthwise through the slitter's circular blades and cut/slit as per the customers’ requirements.
The H&T process involves passing the steel strip through a muffle-type continuous furnace, where its temperature is raised above the recrystallization point to achieve the proper austenite phase. After reaching this temperature, the strip is quenched in molten lead, resulting in a martensitic structure upon air cooling.
Following the quenching process, tempering is performed. This involves heating the previously hardened steel to a temperature below the lower critical temperature and then cooling it at an appropriate rate. The purpose of tempering is to increase ductility and toughness, as well as to enhance the grain size of the matrix. It is also employed to achieve specific mechanical properties, relieve stresses from the quenching process, and ensure dimensional stability while obtaining the desired hardness in the steel strips. After the H&T process, the material is delivered to various work centers according to the material orders received.
At this work-center, round profile and square profile at the edges of the strips are obtained by using tungsten carbide or high speed steel bit. It’s a generally machining process in which tool is fed perpendicular to the strip edges, concave (for getting round profile) or right angles (for getting square edges).
Strip Grinding is also a machining process that's done to remove scaling and blackness on the both surfaces of strips via using abrasive grinding belts. As the grinding belt moves, it cuts material off the strip while creating a smooth surface texture in the process.
It is a super finishing process by which force of sisal and non-woven mops remove scaling and blankness on the both surfaces of the strips. It is similar to the grinding process. However, it is most suitable for thinner material.
This process is also called Blue Annealing, is done on strips to get different surface finishes like Grey, Dark Blue & Bronze. This process has a 6 meter long salt tank containing sodium potassium nitrite in a molten form for getting uniform heating on strips. In this process when the strip dips into the salt tank, the iron oxide will form a layer with specific thickness, causing thin film interference. This causes colors to appear on the surface of steel strip. As temperature is increased, the iron oxide layer grows in thickness and changing the color due to oxidation done on the strip coming out from salt tank. These colors are called tempering colors.