Hot Rolled Round Bar Steel Grades: A Full Breakdown

Intsel Steel

Hot Rolled Round Bar Steel Grades: A Full Breakdown

Steel that has been rolled at a temperature higher than its recrystallization temperature (often 1700 F or above) is referred to as “hot rolled”. The treated steel has more formability and workability than unprocessed steel, making it simpler to work with in the following processing steps.

The hot rolling process begins with a billet, which is a huge, rectangular piece of metal. The billet is first heated and rolled into a big roll. It travels through a sequence of spinning rollers while still hot to attain the correct size. The rolled steel is subsequently twisted into coiled rolls and allowed to cool in sheet metal manufacturing processes. The processed material is chopped into the appropriate units and packed into manufacturing activities involving additional forms.

The Benefits of Hot Rolled Steel

Hot rolled steel has various benefits in the production process, including:

  • Affordability: Because it requires less processing, hot rolled steel is often less costly than cold rolled steel.
  • Minimal internal tension: Hot rolling requires cooling steel over time, allowing it to normalize its microstructure and eliminate internal tensions.
  • Improved usability: The hot rolling technique results in a material that is easier to mold and shape because of the material’s increased workability.

Hot Rolled Round Bar

The lower cost and low carbon content of hot rolled round bar (also known as long products, re-rolled bar, and merchant bar) make it an excellent choice for a wide range of applications. Forging, fabricating, and machining operations may be performed with no need for specific equipment or heat treatments because of the steel’s low carbon content (0.22 percent max) and low yield point (275N/mm2 min).

Pickling and oiling (P&O) or a variety of abrasives, including shot blasting, may remove the surface scale off the bar’s exterior while it is in the AR (as rolled) state. Due to a fast temperature shift during shot blasting the scale offers a limited level of protection against mild corrosion. A rust-like tint may emerge due to humidity and the steel’s mineral composition.

Hot rolled steel is no different from the rest of the metals when it comes to manufacturing tolerances. A billet or bloom is heated to roughly 1200C and passed through a sequence of rollers comprising roughing, intermediate, and finishing. The bloom length or billet is increased by using these rolls, which lower the cross-sectional area. At this point, the section is also generated in terms of its form and specified measurements. The pace at which the steel cools after exiting the furnace is essential to its qualities and appropriateness for use, as the steel cools from 1200C to roughly 900C.

The temperature drop from hot rolling to cold and no additional polishing before end usage makes it impossible to regulate section tolerances properly. Tolerances range from 0.4 mm to millimeters on bigger sections, depending on the size of the piece. Greater precision of 0.2 mm or less is necessary for bright drawn and peeled and ground components.

Hot Rolled Steel Bars Grades

For general-purpose applications, hot-rolled steel bars are employed. This steel has a low carbon content and high mechanical qualities in general. The standard structural procedures, such as moderate cold and hot shaping and welding, are simple to implement.

Below is a detailed breakdown of the grades, applications, and sizes available round shaped bars.

1018A576Round from 1/2″ to 12″20′ RL


1018 is a manganese-rich, low-carbon steel that differs from mild steel as well as other low-carbon steel. This is superior steel for carburized components since it’s higher in manganese, which results in a tougher, more uniform casing. It also has improved machining qualities and mechanical properties, such as Brinell hardness. Chemical composition, heating, rolling, surface preparation, and other manufacturing controls are all employed in its manufacture. As a consequence, a high-quality product suited for forging, heat treatment, cold drawing, machining, and other applications is produced.

Application: Because 1018 is an excellent carburizing steel, it’s ideal for pinions, gears, kingpins, worms, chain pins, liners, oil tool slips, and ratchets that need a high surface hardness with a relatively soft core. Tie rods, anchor pins, studs, special bolts, and other items are often specified in 1018.

1045A576Round from 1/2″ to 12″20′ RL


In the production of 1045, special controls for heating, rolling, chemical composition, surface preparation, and other aspects of medium-carbon steel manufacture are utilized. These bars may be used for forging, heat treatment (including flame hardening), cold drawing, machining, and other applications as a consequence of their meticulous preparation.

Application: When lower carbon steels aren’t strong enough, this steel should be used instead. It becomes even stronger when heat treated. Alloy steel is often used in the construction of automobile and heavy equipment components, as well as in stud bolts and other types of fasteners.

1141A576Round 2″ to 12″20′ RL


1141 is manganese steel with modest carbon content. It’s melted to meet unique bar grade and fine-grain standards while maintaining excellent consistency and homogeneity. Strength properties are vital in the as-rolled form, and heat treatment may increase hardness and strength. Because of the inclusion of sulphur, the machinability is great.

Application: This grade is advantageous in applications requiring superior machinability and increased strength, such as shafts, studs, axles, tie rods, bolts, and so on.

A36A36Round from 1/2″ to 3″20′ RL


This steel has a low carbon content and excellent overall mechanical characteristics. It is simple to make using standard structural procedures such as moderate cold and hot shaping and welding. It is simple to make using standard structural procedures such as moderate cold and hot shaping and welding.

Application: This material is utilized for non-critical and general purpose structural applications involving moderate cold bending, mild hot forming, punching, and welding. General machine components, agricultural tools, transportation equipment, and so on are examples of this kind of use for the material It’s employed in situations when seams and other minor flaws in the surface are acceptable.

At Bushwick Metals, we can accomodate all of your hot rolled round bar needs. Feel free to contact us with questions or request a quote directly.

8 Uses For Flat Bars

Flat bars are arguably the glue holding various components of our modern industrial world together. They are cost-effective to produce, recyclable, and remarkably versatile. Flat bars are also the cornerstone of the construction industry, owing to their low carbon content and highly functional strength. This blog presents eight primary uses for flat bars today.

What Is a Flat Bar?

Flat bars are long rectangular-shaped metal bars commonly utilized in several structural and architectural applications. They are basic building support materials used to support ladder hangers, ductwork, overhead doors, gate latches, among other functions. Flat bars are available in various materials, including aluminum, stainless steel or hot rolled, and more. Owing to their flat and sleek structure, flat bars can be easily cut and molded into the style and design you want your frame to be.

Top 8 Uses of Flat Bars

Frame constructions

Undeniably, flat bars make up massive parts of building frames. Steel flat bars specifically are easy to cut, drilled, and welded, making them the first choice in a range of frame construction and other applications. Flat bars can be prefabricated at the factory stage into the desired shape, meaning a more significant part of work can be done before materials reach the construction site, thereby cutting costs and overall building time.

Improvements and additions

Flat bars are not only used during building stages. They are also an integral part of the construction process that reinforces the existing structures. Flat bars are essential for ensuring a structure remains safe for domestic, commercial, and industrial use. Flat bars can be easily cut and formed to fit, replace and support the materials already in place. They can also be used to reinforce and replace existing materials that have been damaged or those that have degraded over time due to wear and tear. Mild steel is quite reworkable even once already used, thus allowing for easy reinforcement of parts of the structure in severe need of an overhaul.

Industrial artwork

Flat bars are the natural choice for industrial artists and artisans working on large-scale industrial projects such as statues. They are malleable and workable, thus ideal for several art forms, décor, and industrial art pieces. High-quality steel flat bars can be utilized in just about anything from sculptures to modern shelving units. Steel sections can go through additional manufacturing processes that add a smoother finish and outer layering. This ensures the pieces of art get a cleaner, sharper appearance and shinier and reflective surfaces.

Renewable energy

Steel flat bars are undeniably one of the prime materials for the energy industry. It is a recyclable material that boosts sustainability efforts in several renewable energy processes. Flat bars are also used as a foundation in water tower structures and as concrete reinforcing bars for foundations in turbines, generators, and water gates.

Home appliances

Flat bars form integral parts of myriads of home appliances, from latches, overhead doors, and heaters to refrigerators and chest freezers. They are also used in washing machines, extractor hoods, microwaves, and other everyday items. Mild steel flat bars offer unmatched versatility and strength that guarantee the safety of the appliances and reliability. The flat bars used in home appliances are given robust coatings and surface treatments to boost their functionality and durability.

Construction industry

The construction industry is arguably one of the most common industries where steel bars are mostly utilized. Flat bars can function in the same manner as hollow steel bars. They may also be fitted into several types of constructional installations in combination with hollow bars. Steel flat bars offer a high level of versatility that allows cutting to preferred dimensions, sizes, and varying lengths.

The following are some of the typical applications of flat bars in the construction industry:

Steel parking construction works: Flat steel bars used as constructional frames in steel parking projects provide an additional layer of durability and lightweight support. They also provide a high level of illumination in the parking area that helps drivers navigate safely in the event they find themselves driving in low visibility.

Drilling and ductwork: During construction, flat bars are also used in areas like welding or drilling when a frame needs to be given some form of shape. They are also used as a basic building support material to support braces for ductwork areas.

Mainstream industrial works

Construction projects vary widely in scope. However, any large project requires high-quality materials to guarantee its integrity. The right construction materials should be durable and hard-wearing to survive all levels of abuse and extreme environments. Flat bars are a natural choice that gives your industrial project the strength to protect from damages. In addition to its strength and malleability, this metal is also highly flexible. This means industrialists will take less time to cut, drill and operate. They also ease the process of bolting and riveting.

Fabrication works

Mild steel flat bars are a versatile product commonly used in the fabrication industry. It boasts a flat surface and square edge, making it an ideal building support material. Notably, the Grade 300 Flat Bar is most commonly used in fabrication works requiring higher structural integrity.

Contact Bushwick Metals for High-Quality Flat Bars and Other Steel Products

Are you looking for flat bars and other steel products? Well, Bushwick Metals offers an extensive list of steel products for an array of projects. Bushwick Metals is best known for its vast inventory of premium carbon steel structural materials for various applications. As the Northeast’s leading wholesale steel distributor, we have been supplying superior quality steel flat bars and fulfilling orders for businesses working within the construction, automobile, and many other industries for over three decades now.

Whether you specialize in home appliances, construction, renewable energy, industrial artwork, frame construction, or any other project requiring versatile and robust steel materials, you can count on us to offer custom solutions for your specific projects. We have a proven track record providing high-quality products for all our customers and are committed to assisting you with your steel needs now. Our knowledgeable and experienced experts are always ready to help. Contact us today to learn more.