Steel is hot rolled to produce sheet materials.
Steel sheets that come from hot rolling process are pickled and lubricated. You select products that are more suitable for your project to reduce costs and prices.
When some kinds of metals are processed in the mill, such as steel and copper, the resulting products often have surface impurities.
The mill scale is one of the most common types of surface pollutants, but it can also exist in other forms.
Sometimes it is allowed for the purchased metal to have these surface impurities after the formation, however this decision is based on the state by case and depends on usage.
However, depending on the work the metal will be used for, there are some cases where the surface needs to be very clean and pollution-free.
It is common to consider a pickling process and a lubrication process as the final stages of the metal processing method. This is done in such a way that its application requires high levels of cleanliness.
Pickering is a process used to clean the surface of metals, usually after metal is created.
The surface of a metal can be cleaned with the pickling process and it is exposed to acid, which is known as pickling liquid.
The type of acid used in pickling liquid is determined by the metal that is pickling; However, hydrochloric acid is used for pickling the vast majority of low-alloy steel.
When cleaning metals that have high resistance to acids, a stronger acid or a pickling process that requires two steps may be required to obtain the desired results.
How do the pickling process take place?
Usually, a metal should be washed in a solution to get rid of particles larger than the dirt and waste on which it is piled before it can be pickled.
After washing step, metal is transformed into a beverage bath as the next step in the process.
When the metal is immersed in pickling liquid, the acid begins to work to clean the metal surface by removing any impurities.
To prevent the metal from being exposed to acid, after a given period of time, it comes out of the solution.
When the metal is immersed for the proper amount of time in the proper amount of pickling liquid, the surface discontinuity on the metal will be removed and only a small amount of metal will be lost.
After the metal is removed from the liquid pickling, two rounds of washing are done.
After this step, it usually passes through what is called lubrication procedures.
What’s “Ewing”?
To slow or stop the oxidation process, the use of oil is common right after the pickling and washing steps.
After pickling, a metal substrate stays fully open to the environment, which is why the process is done on it.
This can result in faster corrosion.
For steels, in particular, the experience of rust flash after finishing the pickling process is not uncommon.
This corrosion can be avoided and the metal can be stored for a long time with a small amount of oxidation that is used when oil is used on the metal then pickled and rinsed.
Some special manufacturing methods may make it necessary to remove the oil, but this step should not be done until the metal is prepared for production.
hot rolled steel sheet price
Hot rolled steel sheet is converted into different models, such as galvanized, pickled, or oil, and the price varies depending on the model.
In the metalworking method known as “hot roller,” the metal is heated to a temperature that is higher than the recrystallization point, in order to distort it before the work or rolling in terms of plasma.
This method is used to make shapes with required geometrical dimensions and material properties while maintaining the same volume of metal.
In particular, this method is used to create a shape that has the same volume of metal. To obtain the constant thickness and flattening, expansioning and down the cross section of the metal, it is first passed between the two rollers while the metal is still hot.
The steel which is placed during a hot rolling process produces hot rolled steel which is the most output of this process.
Hot rolled steel is widely used in metal industry, either as a finished product or as raw material for operation after it.
The coarse grain of the column formed in the direction of solidification is a non-uniform initial structure of the metal. It is usually brittle, has grain boundaries that are weak, and may include defects such as shrinkage, porosity caused by gases, and foreign substances such as metal oxides.
Grain structure was crushed and the boundaries were damaged by hot rolling.
This leads to the creation of new structures that have strong boundaries and granular structures that are generally stable.
Raw materials such as bloms or slabs are sent directly from continuous casting process to rolling mills while they are still at high temperature.
Before being fed to the mill, the materials used in the operation with a lower capacity begin their journey at room temperature and need to be heated in a wet pit or used for induction.
Advantages of hot rolling include:
Strength is needed.
ductility
Flexibility against vibration and impact
ductility
weldability
Products made of hot rolled steel can be divided into the following categories:
Flat
Long
Seamless
Specialization
Below are typical application samples for hot rolled steel:
Framework elements, such as frames
products in the form of a table, such as gas cylinder and tube
structures found in cars, such as saws and springs
Agricultural equipment
Metal buildings
protective fence
Scale, rust, and pollution can lead to faults on the surface of an object. The formation of scale results from hot surface oxidation with surrounding air.
If the steel is exposed to air for only a short period of time, the mill scale can prevent corrosion.
However, if the exposure is longer, the steel will be surrounded more quickly. If the surface is in contact with water and there is a significant amount of Asia scale, this can also cause severe corrosion.
