Understanding Hot Rolled Steel and its Applications in CNC Machining(machining surface finish chart Bradley)

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In the world of manufacturing and engineering, CNC (Computer Numerical Control) machining plays a significant role in creating various parts and products. One crucial component used in CNC machining is hot rolled steel. This article aims to explore the process of producing hot rolled steel and shed light on its versatile applications in CNC machining.

What is Hot Rolled Steel?

Hot rolled steel refers to a type of steel that goes through an industrial fabrication process known as hot rolling. It involves heating steel above its recrystallization temperature and then passing it between rollers at high temperatures. This process improves the malleability, strength, toughness, and other mechanical properties of the steel.

Production Process of Hot Rolled Steel:

The production of hot rolled steel involves several steps, each contributing to the final quality and characteristics of the material. Below, we will discuss these steps in detail:

1. Heating: The first step in producing hot rolled steel is heating the raw materials, typically large rectangular billets or slabs, using either gas-fired furnaces or electric induction furnaces. The purpose of heating is to reach the optimal working temperature for subsequent processing.

2. Descaling: Once heated, the billet undergoes descaling to remove any scales or impurities that might have formed during the heating process. Descaling can be achieved through mechanical processes or through chemical solutions.

3. Rolling: The next step is rolling, where the heated and descaled billet is passed through a series of squeeze rolls. These rolls apply pressure and compression to reshape the steel into the desired dimensions, such as plates, sheets, strips, or bars. The repeated passes of the billet through the rolls refine the grain structure, enhancing the strength and ductility of the material.

4. Cooling: After the rolling process, the hot-rolled steel goes through controlled cooling methods, such as air-cooling or water quenching. This rapid cooling helps to further enhance the material's properties, ensuring a fine-grained structure and preventing excessive grain growth.

Applications of Hot Rolled Steel in CNC Machining:

Hot rolled steel finds extensive applications in CNC machining due to its excellent mechanical properties. Let's explore some of its key uses in various industries:

1. Automotive Industry: Hot rolled steel is widely used in automotive manufacturing for producing structural components like chassis frames, body panels, engine mounts, and suspension parts. Its high strength and formability make it an ideal choice for handling heavy loads and withstanding extreme conditions.

2. Construction Sector: In the construction industry, hot rolled steel is extensively used for creating beams, columns, girders, purlins, and other structural elements. The ability of hot rolled steel to withstand immense stress and provide stability makes it crucial for building robust and durable structures.

3. Machinery and Equipment Manufacturing: CNC machines themselves often require structural components made from hot rolled steel. Furthermore, hot rolled steel is utilized in producing gears, connecting rods, shafts, brackets, and other intricate parts required in machinery and equipment manufacturing.

4. Energy Sector: Hot rolled steel plays a vital role in the energy sector by being used in power plants, solar panel support structures, wind turbines, transmission towers, and oil drilling rigs. Its ability to handle high temperatures, pressure, and harsh environmental conditions makes it indispensable in the energy generation and distribution processes.

5. Aerospace Industry: Aerospace manufacturers rely on hot rolled steel for designing and fabricating aircraft structural components such as wing spars, landing gear, bulkheads, and turbine disks. The combination of high strength, relatively low weight, and resistance to fatigue makes hot rolled steel suitable for aerospace applications.


Hot rolled steel is a versatile material that has found its place in numerous industries, including CNC machining. Understanding the production process of hot rolled steel and recognizing its diverse applications in automotive, construction, machinery manufacturing, energy, and aerospace sectors is imperative for engineers, manufacturers, and designers utilizing CNC machining. By harnessing the exceptional mechanical properties of hot rolled steel, they can create high-quality components and products that meet rigorous standards and withstand demanding conditions. CNC Milling CNC Machining