Rebar Fabrication: What Is It and Suppliers

What Is Rebar Fabrication?

Rebar is a steel product. It's made of steel, and it's used for construction. Specifically, rebar is used in concrete. Rebar can be used in precast concrete or reinforced concrete.

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It's used to strengthen the concrete and make it more durable. It’s typically used to provide additional support for a building's structure.

There are two types of rebar fabrication: hot rolling and cold rolling. In hot rolling, bars are formed from molten metal; in cold rolling they're formed from solid ingots or billets that have been rolled into flat sheets first by machine before being shaped into bars using coldworking methods like stretching or drawing processes.

The main difference between the two is that hot rolling requires more energy and produces more waste material than cold rolling. However, both methods are commonly used in steel fabrication companies.

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How Many Places Can You Get Rebar Fabrication?

Rebar is the main structural component of concrete. Rebar is made of steel and comes in different shapes, sizes, and qualities depending on their end use. The most common rebar you will find is round or square , with a minimum diameter of 1/2” and a maximum size of 3/4”.

Rebar fabrication is a specialized process that requires specialized machinery to create efficiently. Rebar can be fabricated either on-site or at a factory; both methods have their advantages for specific applications.

Contact us if you have questions on which might be right for your project.

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Types Of Rebar

There are different types of rebar, all which are suited for various applications. The most common types of rebar include:

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Mild Steel Rebar

The primary use of Mild Steel Rebar is in the reinforcement of concrete. The reinforcing steel bars are placed at regular intervals within the freshly poured concrete, which helps strengthen the material against damage from external forces such as temperature changes, wind, etc...

Mild Steel Rebar has many other uses including:

- In construction applications such as brickwork or concrete walls where it may act as an anchor for wires or cables, or may be attached to a surface to provide support for a metal sheet above it.

- As a support system for building materials such as timber joists or plasterboard panels that are not tied directly into the structure of a building.

Galvanized Rebar

Galvanized rebar is made from bare reinforcing steel, which has been cleaned and coated with zinc to protect it against corrosion. Galvanized coatings possess other favorable corrosion characteristics when embedded in concrete, making it an effective coating material for applications such as these.

The most common type of galvanizing process uses hot dipped galvanizing (HDG) where molten zinc is poured over the steel bar at approximately 500 degrees Celsius. This process produces a dense coating that adheres well to the substrate but can have porosity issues due to carbon buildup on raw steel during processing. A newer method known as electro galvanizing (EG) involves passing an electric current through molten zinc, which allows for a thinner, more uniform coating with less porosity than HDG processes.

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Stainless Steel Rebar

Stainless steel rebar is a specialized type of steel that is coated with chromium to prevent corrosion. It’s commonly used in chemical-resistant applications such as food processing plants, swimming pools and other places where stainless steel will last longer than regular steel. Stainless steel rebar can also be used for aesthetic purposes, such as creating a decorative railing or fence.

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European Rebar

European rebar is a specialized type of steel that’s used in applications where it must be able to withstand high loads. It has a higher strength-to-weight ratio than standard steel, which makes it ideal for use in buildings and bridges.

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Carbon Steel Rebar

Carbon Steel Rebar is the most common type of rebar and is used in many applications because it’s cheap and easy to work with. It contains a small amount of carbon, which makes it stronger than stainless steel but also less resistant to corrosion. This type of rebar isn’t suitable for use in highly corrosive environments, such as saltwater or concrete.

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Epoxy Coated Rebar

Epoxy Coated Rebar is a premium grade of rebar that’s coated with an epoxy resin. It has a higher strength-to-weight ratio than carbon steel, which makes it easier to work with, and it’s also more resistant to corrosion. This type of rebar is suitable for use in any environment where there are corrosive chemicals present or if it will be exposed directly to saltwater.

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Glass-Fiber-Reinforced-Polymer (GFRP) Rebar

GFRP rebar is made from a combination of glass and polymers, which makes it extremely strong. It has many of the same properties as carbon steel but with a lower density and weight-to-strength ratio. Rebar made of this material are used in highly corrosive environments where chemicals or salt water may come into contact with the bars.

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Where Do I Find Rebar Fabrication Supply Near Me?

The good news is that rebar fabrication supply is available at many locations.

Camblin Steel serves the following areas:

• California
• Nevada
• Arizona

Markets Served

Rebar fabrication is a broad term that can be used to describe many different types of construction. The most common markets served by rebar fabrication include:

• Commercial Construction
• Highrise Construction
• Retaining Structures
• Paving
• Petro Chemical
• Office Buildings
• Renewable Energy
• Heavy Highway Construction
• Parking Decks
• Foundations
• Heavy Industrial
• Institutional
• Retail And Restaurants
• Multi-family
• Heavy Concrete Construction
• Masonry Walls
• Manufacturing
• Healthcare
• Hotel And Motel
• Single Family
• Bridge Structures
• Pre-Cast
• Wastewater Treatment Plants
• Power Generation
• Schools

Rebar Fabrication Is Important For All Sorts Of Construction Projects.

Rebar fabrication is important for all sorts of construction projects.

Reinforced concrete is used to build everything from houses and bridges to parking garages and stadiums. Rebar is a critical component of concrete, as it helps the material withstand pressure and provide more support than plain cement alone. The type of rebar used depends on your project's requirements; steel rebar is generally stronger than fiberglass or stainless steel, but fiberglass can be molded into any shape while still offering high tensile strength. The most common forms of rebar include: bars made from carbon-steel wire wrapped in plastic; bars made by plating steel with zinc or aluminum alloy; bars manufactured with glass fibers infused with epoxy resin; or bars made using an extrusion process in which molten metal flows through a die onto a continuous strip called tubing (or coil) that's been wound around a mandrel (a cylindrical core).

Before we answer the question of how TMT bars are manufactured, let’s first know what TMT bars are. TMT or Thermo Mechanically Treated bars are high-strength reinforcement bars having a hardened outer core and a soft inner core.They are manufactured under a process called Thermo Mechanical Treatment, after which they are named.

Steel – an alloy of iron, carbon, and other elements – is a major component used in buildings, infrastructure, tools, ships, automobiles, machines etc., because of its high tensile strength. However, steel structures are adversely affected by corrosion, fire, and other environmental and accidental factors, thus severely compromising their structural integrity, safety, and longevity. Thus, steel is subjected to various processes to increase its mechanical properties like ductility, hardness, corrosion resistance, and yield strength. Thermo Mechanical Treatment (TMT) is one of these many processes; it combines mechanical or plastic deformation processes like compression or forging, rolling etc. with thermal processes like heat-treatment, water quenching, and heating and cooling at various rates into a single process.

The steps included in Thermo Mechanical Treatment Process are as follows:

1. Extraction of iron from its ore and converting to steel: In this process, the raw materials, such as iron ore, coke, or fluxes (limestone and dolomite) are used to extract iron which is kept in the molten state. Then, this molten iron is subjected to pre-treatment and converted to steel in a converter and is then subjected to ladle heating for refining the chemistry of the steel. After this step, the molten steel is poured into a casting machine to produce billets (pencil ingots) of about 130 mm2 or more.
2. Heating, rolling, and forming of reinforced bar: The steel billets are heated to approximately  °C ( F) to °C ( F) and then rolled to reshape the billets into the final size and shape of reinforced bar (rebar) bypassing the billets through a rolling mill stand.
3. Quenching: When the hot reinforced bar leaves the final rolling mill stand, it is instantaneously quenched – a type of heat treatment where the rebars are rapidly cooled by water in a quenching box to obtain certain material properties. Quenching prevents the occurrence of undesired processes such as phase transformations. It accomplishes this by reducing the time frame during which these undesired reactions have a higher chance of occurring. Also, the sudden drastic change in temperature toughens the outer layer of the steel bar, thus enhancing its tensile strength and durability. This is because quenching converts the outer surface of the reinforced bar to Martensite, a hard form of steel and causes it to shrink, which in turn pressurizes the core, thus helping to form the correct crystal structures. As a result of this process, the surface of the quenched bar becomes cold and hardened, while the core still remains hot.
4. Self-tempering: After leaving the quenching box, a temperature gradient is formed through the cross-section of the quenched bar. As a result, heat flows from the core, as it is at a relatively higher temperature to the outer surface. This causes the correct tempering of the outer martensitic layer into a structure called Tempered Martensite and the formation of an intermediate ring of Martensite and Bainite (a plate-like microstructure). The core still stays in the austenitic (a typical cubical crystalline structure, commonly called as gamma-phase iron) state at this stage.
5. Atmospheric Cooling: After the self-tempering process, the bars are subjected to atmospheric cooling to equalize the temperature difference between the soft inner core and the hardened exterior. Once the bars are completely cooled down, the austenitic core gets transformed into a ductile ferrite-pearlite structure.

Therefore, the cross-section of the final product demonstrates a variation in its crystal microstructure having a tough, strong, tempered martensite in its outermost layer, an intermediate layer of Martensite and Bainite, and a refined, tough and ductile ferrite and pearlite core.

On the other hand, lower grades of rebar are twisted when cold to harden them in order to increase their strength. However, TMT bars do not need hardening explicitly as the quenching process accomplishes this. Since TMT does not involve any twisting, no torsional stress occurs, which does remove the chances of surface defects forming in TMT bars. Hence, TMT bars are less susceptible to corrosion as opposed to cold, twisted, and deformed (CTD) bars.

The production quality of TMT bar depends on three major factors:

• Quality of raw materials.
• A properly designed and automated rolling mill stand.
• A well-designed quenching and tempering technology.

TMT bars, having a uniform and concentrated hardened periphery and a considerably softer core, will have the desired tensile strength coupled with high elongation as required in the construction of buildings located in areas with regular seismic activity.

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