December 22, 2025
Hot rolling is the process of shaping steel between rollers by heating it above its recrystallization temperature. Hot-rolled steel, used in many industries such as automotive, machine manufacturing, construction, and defense, is one of the industry’s most fundamental inputs due to its strength, cost advantage, and high production speed.
As Uyar Steel, we offer a wide range of products manufactured after hot rolling. Our products comply with EN and ASTM standards and are manufactured to meet the chemical composition, strength, and surface quality values required for each project.
What is Hot Rolling?
Hot rolling is the process of heating steel to a temperature range of 900–1200°C and then flattening it between rollers to increase its length and achieve the desired cross-sectional shape. During this process, the metal becomes more malleable due to the high temperature, enabling large-scale production.
The types of steel subjected to this process are called hot-rolled steels at the end of production and serve as a basic raw material in many areas of industry.
How Does the Hot Rolling Process Work?
Hot rolling is a technical production process consisting of several stages:
Raw material preparation: Semi-finished products such as slabs, billets, or blooms are prepared.
Heating: The steel is heated above its recrystallization temperature.
Rough rolling: The thickness is reduced, and the initial shape is formed.
Finishing rolling: The final shape is given to the cross-section.
Cooling: It is cooled in a controlled manner using air or water.
Cutting and quality control: Length cutting, surface inspection, and classification are performed.
All products resulting from this process form the basis of the hot-rolled steel product range offered by Uyar Steel.
Advantages of Hot Rolling
When we look at the reasons why hot rolling is preferred across a wide range of industries, it offers significant advantages:
High production speed: Large-tonnage production can be completed in a short time.
Cost advantage: It is much more economical compared to cold rolling.
Wide forming capability: High temperatures make steel easier to shape and form.
Homogeneous internal structure: Internal defects originating from casting are largely eliminated.
Wide variety of cross-section production: Different profiles such as flat, square, round, and hexagonal can be easily produced.
All these products offered by Uyar Steel are kept continuously in stock to meet the engineering requirements of various industries.
Disadvantages of Hot Rolling
As with any manufacturing method, hot rolling also has certain limitations:
Due to scale formation on the surface, the surface quality is not as smooth or bright as that of cold-drawn steel.
Dimensional tolerance accuracy is at a medium level.
In some applications, secondary processing or cold drawing may be required.
For this reason, if high surface precision is required, cold-drawn steel may be preferred as a subsequent process after hot rolling.
Uyar Steel Hot Rolled Product Groups
Steels obtained after hot rolling are produced in different cross-sections and standards. Uyar Steel, as a strong supplier manufacturing according to international EN standards, offers a wide range of products.
Hot-Rolled Flat Bar Steel (EN 10058)
Among the products obtained after the hot rolling process, hot-rolled flat steel is one of the most preferred sections in machine manufacturing and metal construction applications. Thanks to their wide surface form, these steels offer safe use in chassis, load-bearing structural elements, and general engineering projects.
Hot-Rolled Square Steel (EN 10059)
Hot-drawn square steel grades used in the production of shafts, joints, and load-bearing elements are prominent in applications requiring high strength. The square cross-section provides stable performance in many critical areas, from automotive parts to machine components.
Hot-Rolled Round Steel (EN 10060)
One of the most commonly used products in the production of pins, bolts, gear blanks, and fasteners is the hot-drawn round steel group. Thanks to its diameter accuracy, machinability, and wide range of dimensions, it is an ideal solution for both light machinery and heavy industrial projects.
Hot-Rolled Hexagonal Steel (EN 10061)
Hot-rolled hexagonal steel, a key input in the production of fasteners, is extensively used in the processing of nuts, bolts, and special fasteners. Its hexagonal shape is among the preferred cross-sections in production due to its high efficiency in chip removal processes.
All these product groups can be supplied in different sizes and qualities thanks to Uyar Çelik’s extensive inventory.
Chemical Properties and Standards
The chemical analyses of steels produced by hot rolling may vary depending on their application areas. The steel grades in Uyar Çelik’s product range include:
- S235JR
- S275JR
- S355JR
- C45
- C25 – C35
- SAE 1030 – SAE 1040 – SAE 1050
- 16MnCr5
The carbon, manganese, silicon, phosphorus, and sulfur ratios in these steel grades are determined in accordance with EN and ASTM standards.
All of these chemical values are listed in detail by quality in Uyar Steel’s hot-rolled steel product group and can be easily reviewed via technical tables.
Areas of Use
Steels produced by hot rolling are used across all major branches of industry:
Automotive industry
Machinery and equipment manufacturing
Construction and structural steel applications
Energy projects
Defense industry
Heavy industry and manufacturing sectors
For example, hot-rolled round steel is preferred for components such as shafts and axles; hot-rolled hexagonal steel is used in the production of fasteners; hot-rolled square steel is commonly used for structural applications; and hot-rolled flat steel is frequently preferred in mechanical structures.
Differences Between Hot and Cold Rolling
Hot rolling is ideal for high-volume, economical production. Cold rolling, on the other hand, is preferred in situations where surface quality and dimensional accuracy are required.
Key differences:
| Feature | Hot Rolling | Cold Rolling |
|---|---|---|
| Temperature | 900–1200°C | Room temperature |
| Surface Quality | Medium | Very high |
| Strength | Medium | High |
| Tolerance | Medium | More precise |
| Cost | Low | High |
These differences should be taken into consideration when determining which type of steel is suitable for a project.
Uyar Çelik's Production Quality and Supply Advantages
Uyar Steel not only supplies products manufactured after hot rolling in compliance with standards, but also provides technical support throughout engineering and project planning processes.
Key advantages of the company include:
- Production compliant with EN and ASTM standards
- Color-coded stock management system
- Wide range of diameters and quality options
- Cut-to-length service in line with custom size requirements
- Fast and efficient delivery network
- Transparent presentation of chemical analysis reports for products
All hot-rolled steels supplied by Uyar Steel are prepared within the framework of this quality policy.
Hot rolling is one of the most effective production methods for shaping steel, increasing its strength, and enabling mass production. Uyar Steel’s production quality, which complies with international standards, its wide product range, and strong stock structure, make all products resulting from hot rolling reliable and sustainable solutions for engineering projects.
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