Steel bars in the construction industry are a longstanding presence. They give buildings the strength and structure necessary to stand as a shelter.
Steel manufacturing companies in Karnataka specialize in manufacturing steel bars with optimal tensile strength and flexibility. The bars attain such properties through a series of repeated processes such as rolling, quenching, cooling, and heat treatment.
The steel bars are also used to reinforce concrete and positively impact the tensile strength to make sure that the structure stands the test of time.
Steel bar manufacturing
The steel manufacturing companies in Karnataka follow five primary processes.
Extraction
First, manufacturers extract raw materials for the process. It includes coke, iron ore, limestone, and dolomite. They load the raw materials into the blast furnace and treat them with hot gases. They convert the materials into steel in their molten state. Manufacturers then pass the produced steel through ladle heating for chemical composition refinement. The last step is manufacturers casting them into the desired shape.
They heat the molten steel to 1250 degrees celsius and roll them in a rolling mill. Manufacturers rapidly cool the rolled steel bars to avoid undesirable properties. This rapid cooling is also known as quenching. The quenching process reduces the time frame the steel is thermodynamically favorable to unwanted properties.
The inner core of the steel is at high temperature than the surface after rapid quenching. The outer structure tampers due to heat transfer from the inner metal to the outer layer.
Manufacturers let this natural self-tampering get completed to allow the formation of martensite and bainite rings. After self-tampering, they let the bars cool at room temperature. As a result, a ferrite-pearlite structure forms on the core.
Rebar applications
Many construction projects use steel bars as reinforcement bars due to their high-temperature elongation is similar to concrete. Therefore, steel bars can impart the tensile strength necessary to keep concrete in place.
Rebar production
Steel manufacturing companies in Karnataka produce rebars in Electric Arc Furnace. They collect scrap steel from various sources. And melt them at a high temperature. Then, pour the molten steel into a casting machine.
This method provides a way to cast the molten steel into the desired shape known as millets. Manufacturers load the billets into a roughing mill for hot rolling them into small shapes.
Then, the bars enter the section to cut them into specific lengths. They let the prepared rebars cool at room temperature after the cutting step. The last step involves shearing them into specific lengths.
Different types of rebar
Carbon steel
The common type of rebar is carbon steel. Contractors also refer to carbon steel rebars as black bars. The carbon steel rebars are versatile, making them appropriate for a variety of construction projects. These bars are suitable for structures in areas with high humidity.
Welded wire fabric
Companies produce Welded Wire Fabric from a series of steel wires. They arrange the steel wires at right angles and electrically weld them at crossings. This variety of rebars is ideal for walls and structural floor slabs. Contractors also use them in road pavements, drainage structures, and box culverts.
Sheet-metal reinforcing
Projects like roof construction, stairs, and floor slabs benefit from sheet-metal reinforcement. Sheet-metal reinforcing bars comprise annealed sheet pieces bent into corrugations at regular spacing.
Epoxy-coated rebars
These epoxy-coated rebars are more expensive than other rebars. They are ideal for constructions that will be in contact with saltwater. These epoxy-coated rebars can resist corrosion better. But, it is essential to order from a reliable supplier.
Stainless steel rebars
An alternate for carbon steel reinforcements is stainless steel rebars from steel manufacturing companies in Karnataka. It is a cost-effective solution for contractors because these bars will not create galvanic corrosion. They avoid the need for expensive and difficult repairs by resisting corrosion better than the expensive epoxy-coated rebars.
