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Steel Foundations
Hot rolled bars are products of a bar mill. Depending on the final application, the bars can be either shipped as hot rolled bars or further processed into cold rolled bars, also known as cold finished steel bars. The cross-sectional shape can be round, square, flat or hexagonal.
Most common types of hot rolled bar is merchant bar quality, or MBQ, which is specified when standard steel quality for non-critical applications is needed. Bars come in sizes ranging from 0.25 to 3.5 inch (6.4 to 90 mm) in diameter or side length. Depending on their chemical composition and properties, MBQ bars can be used in a wide variety of applications, such as general purpose structural, machinery parts, frames, fixtures, automotive and agricultural implements and equipment, brackets, stakes, ornamental works, forgings, base plates. As well as many other miscellaneous, non-critical applications that involve mild cold bending, mild hot forming, punching, machining, and/or welding.
Bars can also be produced as special bar quality steels, or SBQ, for more critical applications. SBQ bar can have special requirements for minimal steel impurities or tighter chemistry, dimensional, or property tolerances. They are mainly used in the production of fast-moving automotive and aircraft parts that require high-demanding performance.
Hot rolled bar begins by heating blooms or billets in a reheat furnace. The temperature of the billet exiting the reheat furnace is dependent on the steel grade being rolled and the design of the rolling mill. However, it must be heated above the material&#;s recrystallization temperature, due to the extreme amount of reduction done during this process.
The reheated steel is cleaned using a descaler and rolled to its final size and shape through a series of rolling passes (generally referred to as roughing, intermediate and finishing passes). Then the bar is cut to the desired length and allowed to cool to ambient temperature.
Processing parameters, such as reheating temperature, hot rolling specifics of reduction per pass, temperature of each rolling pass, interpass times, strain rates in each pass, total amount of rolling reduction, steel chemistry and final cooling time-temperature profile can all influence the final as rolled steel bar properties.
Hot rolled steel bar is produced from iron ore or most commonly from recycled scrap metal in electric arc furnaces. Temperatures nearing 3,000 F liquefy the scrap which is cast in molds to produce an ingot or a billet. These ingots and/or billets are reheated to 2,000 F and forced through a series of machined rolls to form the round, square or hexagon shapes for hot rolled steel bars. Hot Rolled bars are the primary feedstock for many forging and machining applications and are used in their &#;as rolled&#; condition. Common applications and industries that use hot rolled steel bars include:
To learn more about the quality and composition of our steel, read the Eaton Steel Bar Handbook!
For more information, please visit Xingtai Steel.
Read the Eaton Steel Bar Handbook
Read about the industries that use these products.
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***Minimum Total Quantity Per Order is 10,000 lbs.***
Hot Rolled SBQ bars are classified commonly in the following ASTM and SAE specifications:
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Eaton Steel Bar Company provides Hot Rolled SBQ rounds, round-cornered squares, and hexagons and maintains the largest inventory of SBQ carbon and alloy bar products for the forging and machining industries in North America. We deliver more than 500 hot-rolled steel bar products as well as custom grades based on your specifications that are hot, warm and cold forged and machined into precision parts across a broad range of industrial and consumer categories.
Our four locations in the metropolitan Detroit area include approximately 800,000 square feet of production and warehouse space on over 40 acres of land. We also stock steel at warehouses around the country, which allows us to ship and deliver the same day to manufacturers and service centers throughout the United States, Canada, and Mexico.