Hard Strips (india)

Ajmeri Gate, Delhi

Hard strips (india) is one of the leading steel strips & steel coils manufacturers offering steel strips and coils in india. Steel strip is a steel product that is produced from a hot rolled steel strip that has been pickled. The steel coil is then reduced by a single stand cold roll steel mill straight away or reversing mill or in a tandem mill consisting of several single stands in a series. The steel strip is reduced to approximately final thickness by cold-rolling directly, or with the inclusion of an annealing operation at some intermediate thickness so that further cold reduction can be done or so as to obtain the mechanical properties required in the finished product. High carbon steel strip requires additional annealing and cold reduction operations. The steel coil is then slit to the desired width through the process of roll slitting. The final product typically consists of cold rolled steel strip that has been cut into strips of a specific widths and coiled for delivery, interleaved with a material which protects the surface finish of the material and assists in retaining oil or some other rust prevention solution.

Hard strips (india) is one of the leading spring steel strips & coils manufacturers offering spring steel strips & coils in india. Spring steel strips are low alloy, medium carbon steel strips or high carbon steel strips with a very high yield strength. This allows objects made of spring steel strips to return to their original shape even if they are significantly bended or twisted. Silicon is the key component to most spring steel alloys. spring steel strip is used in the production of springs. This range of steel strips normally contains between 0.40% and 0.80% carbon, with alloying elements added for products such as automotive clutches, sheet metal components etc. Spring steel strips are also used in a number of applications where hardness or resistance to bending is required such as wood cutting tools. Spring steel strips are supplied either in the annealed condition or in hardened and tempered form. Hardened and tempered spring steel strip is more suitable for flat components or where the production is primarily laser cutting or plain blanking.

Cold rolled spring steel strips or cold rolled close annealed steel coils are made from hot rolled coils skelps sheets. Cold rolling is a process through which the hot rolled steel sheet or strip after pickling process is introduced between rollers by application of high pressure at temperature below the re-crystallization temperature. This method basically imparts smooth surface finish, accurate thickness, high tensile strength, yield strength hardness with corresponding decrease inductility. Hence selection of proper combination of steel composition, degree of cold working and heat treatment play a pivotal role to produce cold rolled sheets strips having diverse applications and mechanical properties suitable for a wide spectrum of end users including segments like automobiles, bicycles, trains, washing machines, compressors for acs and refrigerators, cutting tools like saws and blades, and a host of other sheet metal components.

Hard strips (india) is one of the biggest manufacturers of low, medium, high carbon steel strips & steel coils in india. Carbon steel strips are the steel strips where the main alloying constituent is carbon. Carbon steel is defined as the steel when no minimum content is specified or required for chromium, cobalt, columbium, molybdenum, nickel, titanium, tungsten, vanadium or zirconium, or any other element to be added to obtain a desired alloying effect; when the specified minimum for copper does not exceed 0.40 percent; or when the maximum content specified for any of the following elements does not exceed the percentages noted: manganese 1.65, silicon 0.60, copper 0.60.

Offers hardened & tempered spring steel strips coils are also commonly known as "h & t steel strips". Hardening and tempering is a thermal process that strengthens steel strips through a controlled heating and cooling process. This process of hardening and tempering improves the mechanical properties of the steel strip and gives a tougher and more durable product. The hardening process involves heating the steel strip to above the critical transformation temperature for the given grade and then rapidly cooling. The problem here is that the steel strip in this condition is extremely brittle and therefore requires further treatment in the form of tempering. This consists of reheating the steel strip to a lower temperature and holding it at the given temperature for a given period of time. This process is done in an inert atmosphere to avoid oxidation. This type of steel strip has high degree of toughness and has excellent spring properties. This type of steel strip can be used for various applications like wood cutting saws, industrial knives, sheet metal components, automobile sector and springs.

Offers annealed steel strips. Annealed steel coils are produced by the process of annealing which is a type of heat treatment wherein the steel strips are altered, causing changes in its properties such as strength and hardness. Hard strips (india) manufactures annealed steel coils in the following manner. Firstly heating is done above the recrystallization temperature and a suitable temperature is maintained, and then after this cooling is done. Annealed steel strips are ductile, soft, relieved from internal stresses and have a refined structure which is done by making it homogeneous. Thus the steel strips are softened and prepared for further work such as shaping, stamping, or forming.

Hard strips (india) is a leading name in the field of fully annealed steel strips coils. Hard strips (india) is one of the leading manufacturers of good quality fully annealed steel strips coils in india. Full annealing leads to the second most ductile state a metal can assume for metal alloy. It creates an entirely new homogeneous and uniform structure with good dynamic properties. To perform full annealing, the steel strip is heated to its annealing point and is held for sufficient time to allow the steel strip to fully austenitize, to form austenite or austenite-cementite grain structure. Austenitization is the process of heating the steel to a temperature at which it changes its crystal structure from ferrite to austenite. The material formed in the previous step is then allowed to cool slowly so that the equilibrium microstructure is obtained. The material can either be air cooled or furnace cooled. The result is always a more ductile material that has greater stretch ratio (the stretch ratio or extension ratio is defined as the ratio between the final length ℓ and the initial length l of the material line.) and reduction of area properties but a lower yield strength and a lower tensile strength. Genrally steel strip that is to be machined, will be annealed, then it will be further followed by heat treatment to obtain the final desired properties.

Spheroidizing is the process which leads to the formation of spheriodized spring steel strips. Spheroidite is formed when carbon steel strips are heated to 700 °c (approx.) for about 30 hours. Although spheroidite can form at lower temperatures but the time needed increases to a great extent, as this is a diffusion-controlled process. The result is a structure of rods or spheres of cementite within primary structure (ferrite or pearlite, depending on which side of the eutectoid you are on). The purpose of this process is to soften higher carbon steel strips and thus allow more formability. These are the softest and most ductile form of steel strips. Spheriodized steel strips are used for various application requiring maximum cold forming.