The use of stainless steel bars in various industries, especially the construction industry, has brought great progress. The steel section, and the new fiberglass, it is manufactured in various forms and standards, and today it is considered an integral part of the construction industry. The reason for this is the unique mechanical properties of this part. Each type of reinforcement is used in a specific part of the building according to its characteristics and appearance. In addition, rebar is used in other industries, including spring manufacturing and the construction of artistic structures. The most important application of rebar is in the construction and reinforcement of concrete. Of course, despite its high compressive strength, concrete is not particularly tensile. This means that if concrete expands or contracts due to temperature changes, it will crack. 
Since the 18th century, structural engineers have gradually realized that steel bars can help solve this problem. The thermal expansion coefficient of rebar is very close to that of concrete. Therefore, the steel bars planted in the center of the concrete are exposed to the tensile stress exerted on them due to temperature changes, which prevents the concrete from cracking. It is important to note that no material can prevent 100% of concrete from cracking, but rebar can keep cracks at a very small and low-risk level. One of the uses of rebar is to use it to increase the thermal resistance of buildings. The rebar that is placed on the joists after the roof concrete is poured is called hot rebar. In addition to increasing the roof concrete's tensile strength, this reinforcement also prevents it from falling into a fire. Hot rebar is used for log block roofs, steel decks, and chrome roofs. Use of different types of steel bars in different parts of buildings In each country there are specific rebar production and marking standards. Types of these standards include European, American, Chinese, Russian, etc. In our country, according to the long tradition of iron manufacturing enterprises, the Russian standard must prevail. On this basis, four types of rebar are produced in the following order.
- Single rebar without tread or A1
- Ribbed bars with ribbed bars or A2
- Ribbed bars or A3 with two rows of ribs in opposite directions
- Twisted ribbed bars or A4
In addition to appearance, each of these rebars differs from one another in terms of mechanical and chemical properties. In fact, what determines the use of rebar is its appearance differences as well as its mechanical and chemical properties. The reason for the difference in properties is that each rod is made of a special steel alloy that differs from each other, especially the percentages of carbon, nickel, and chromium. We explain the use of these four types of steel bars in different parts of the building. Use of rebar A1 Due to the lack of tread, this reinforcement does not form a good bond with concrete. Therefore, its use as electrical resistance and thermal amplification is prohibited. In addition, this rod has the lowest alloy content of carbon; therefore, it is softer than other rods and loses strength more quickly when heated. The application of A1 rebar made of carbon steel is mainly in joining and quenching operations. Application of rebar A2 The alloy of this rebar contains more carbon than the A1 rebar. For this reason it is relatively rigid and should not be soldered unless necessary. This type of rebar is also called semi-hard rebar. A2 reinforcement is used for concrete main body, shear wall construction and damping. Because only one tread row is used on this bar, it provides minimal tensile strength to the concrete. Therefore, it is not recommended for use in areas with extreme temperature changes. Application of rebar A3 This rod also has a higher carbon content and is therefore stiffer than the first two rods; conversely, it has higher tensile and compressive strengths. This bar has more contact with the concrete than the A1 bar because it has two rows of tread on it. 
This type of rebar is also called hard rebar. A3 rebar is mainly used for columns and beams. This reinforcement must under no circumstances be welded. Application of A4 steel bar It is the hardest type of rebar available in the country, with the greatest possible conflict with concrete. In addition, its tensile and compressive strengths are higher than other types of steel bars. Therefore, this type of steel rod is used in areas where the temperature changes drastically between day and night or winter and summer, such as desert areas. Also common on shear walls, curved frames, and columns. Different types of reinforcement applications In addition to the usual forms, rebars are called straight or longitudinal rebars; they are made in different geometries and used in buildings. The stirrup is a rectangular cross-section obtained by bending rebar. The purpose of using reinforcement in this way is to prevent the longitudinal reinforcement from sticking out of the concrete due to the increase in length. Stirrup also increases the concrete's resistance to shear forces and prevents it from cracking under pressure. For the production of Stirrup, steel rods with high bending capacity are used. This work is done by a cold bending machine. This operation must be carried out at temperatures above five degrees Celsius. dome reinforcement This rebar is a bridge that can be placed between two parallel rows of reinforcing mesh. The application of this reinforcement and parallel reinforcement is on floors and foundations of concrete structures. Depending on the required distance between the two mesh networks, the height of the vault bars can also be varied. 
Rebar (Otka) Otka means duck in Russian. The shape of this steel rod is named after its resemblance to the body of a duck. Otka reinforcement is used to connect the beam to the lower wing of the beam. This is done to ensure that the beam does not move out of its original position. Otka rods are available in two forms, single-sided and double-sided. rebar Dowel rods are also used laterally like Stirrup. The name of this rebar reflects its shape, although it is also marketed as wrought and crocheted. The dowel reinforcement is used to strengthen the connection between the longitudinal reinforcement and the Stirrup and increase the shear resistance of the Stirrup. It is usually thin in diameter and uses A2 rebar in its construction. This rod is shaped like a longitudinal rod with the ends bent at equal angles of 90 or 135 degrees. hanger bar This rebar has the same application as bow and hooks rebar, except that it is used to hold two rows of vertical meshes parallel. Shaped like the English letter U, this steel rod is mainly used for concrete walls and floors. 
stainless steel application in the construction industry
Because of its size and shape, steel's role in construction leaves a very high degree of flexibility and unmatched resistance. Besides being used in construction, steel is also used in other industrial processes. For example, the role of steel in the production of materials is very colorful. Compared to industrial steel, structural steel comes in different shapes and types. Structural steel is used for important parts of structures, such as building parking lots, schools and cars. All of the above construction cases require low-cost, high-security building materials. Therefore, concrete showed a decisive and appropriate role in the direction of construction. Of course, steel sections are also used to make the frame. A high percentage of iron is used in the steel sheet construction. Iron available in construction, in the case of steel sheets, can be applied to roofs and interior walls, roofs and doors and windows. Concrete is of course a suitable coating for walls. What is the role of steel in rebar production? 44% of the steel is used to make rebar. Due to its weak structural tensile strength and high compressive strength, it is not at all suitable for bearing the load of buildings. For this reason, reinforcement as a suitable structure in a building can have an ideal skeleton to compensate for this tensile strength of the building. Steel bars are widely used in construction, and steel bars carry the tensile stress generated by the building and the weak points of the concrete. Appropriate reinforcement should be selected according to the structural conditions. The correct life and service life of the structure should be increased. The lifespan of a structure depends on the occurrence of earthquakes and natural disasters. 
The degree of damage to the building shows how solid it is in construction. Of course, the prices of building materials have risen dramatically these days. Therefore, as one of the functional materials in the steel family, the cost of rebar is relatively high. As Iran faces several challenges in terms of inflation and the daily price of construction materials, the amount of spending is increasing. The role of steel in pipe production Pipes are one of the most important components of a building. The tube can be used in two ways, metallic and non-metallic. The most practical types of plumbing, include:
- black pipe
- Pipes for water supply
- gas delivery
- Mansiman pipe
- Galvanized pipe
- Pipes for city water and wastewater
The role of steel in the manufacture of building profiles One of the building materials in which steel plays a decisive role in construction is called section steel. This profile is used to manufacture corners, studs, shields and cans. They even use steel profiles for doors, windows, fences and pillars. Of course, the corner is suitable for supporting and supporting beams, columns and platforms in building construction. Of course, one of the other uses of the steel angle is its production as a support. 
The role of steel in increasing building resistance Since the resistance of the building is very high, they use steel and iron beams. Therefore, there is no need to produce large, high-strength brick walls. Steel is suitable for buildings with more limited space. The role of steel and its impact resistance Steel is characterized by its ability to withstand a variety of forces. Forces that can affect structural steel include:
- earthquake
- storm
- its flexibility
Therefore, the steel's resistance to various earthquakes and storms is very high. The flexibility of the steel and the pressure exerted on it greatly prevents it from shattering and collapsing. Long-life steel frame Creating a structure must be done in a way that respects resistance and strength. Of course, the building's skeleton should not lose its resistance over time. It caused its collapse by losing the strength of the steel used in the building's skeleton. In this way, the production of steel structures leaves more resistance and durability without rotting and breaking. In general, the use of steel in construction left a decisive and important role. Structural steel is a simple structure of carbon and iron. The amount of carbon is of course 2% and iron is 98%. 
Can steel be recycled? In most cases, a large amount of steel is left behind by demolishing buildings. All steel profiles used in the building can of course be recycled. In this way, advantageous recycling is easily possible by dismantling the building and separating the steel sections in it. Recycle structural steel, in the form of melting and recycling, without losing the properties of the steel. Recycling different types of steel is to avoid waste of raw material resources. In recycled steel, none of its benefits and properties are lost. To take advantage of all types of structural steel, you must first be aware of the strength of each steel. Of course, with steel and its sub-assemblies, there is a high level of resistance in any type of structure. But for a better and more affordable purchase of products related to steel and its construction types, you must take the help of engineers and experts in the field. It is true that rebar is not used in any industry as well as in construction, but we cannot ignore its use in other industries either. One of the most widely used rebars in other industries is the A1 rebar. This rebar made of carbon steel has special applications in forging. In addition, A1 steel bars made of alloy steel are used in the manufacture of industrial parts such as automobile manufacturing, the aerospace industry, bolts, and nuts. If stainless steel is used in the construction of A1 rebar, aviation, hospital equipment, chemical, petroleum, and petrochemical industries will also be the customers.