• Carbon Structural Steel Square Bars Q235CR System 1
  • Carbon Structural Steel Square Bars Q235CR System 2
  • Carbon Structural Steel Square Bars Q235CR System 3
  • Carbon Structural Steel Square Bars Q235CR System 4
  • Carbon Structural Steel Square Bars Q235CR System 5
  • Carbon Structural Steel Square Bars Q235CR System 6
Carbon Structural Steel Square Bars Q235CR

Carbon Structural Steel Square Bars Q235CR

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Loading Port:
Shanghai
Payment Terms:
TT OR LC
Min Order Qty:
25 m.t.
Supply Capability:
120000 m.t./month

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 Carbon Structural Steel Square Bars Q235CR

 

Product Specification

1, Chemical Composition %

GradeCSiMnSPCr
Q235CR≤0.22≤0.35≤1.4≤0.050≤0.045≥0.30

2, Mechanical Properties 

Strength of Extension σbYield Strength  σsElogation δ5
375-500 Mpa≥235 Mpa≥25 %

3, Diameter: 9mm, 9.8mm, 10mm, 12mm, 12.5mm, 13mm, 15mm, 15.87mm, 16mm, 19mm, 

                   20mm, 22mm, 25mm, 25.4mm, 28mm, 38mm, 50mm, 51.5mm, 53mm, 65mm, 75mm, 100mm

   

Application

 1, Widely used in construction and engineering structure.

 2, Widely used in making reinforcing steel bar or building plant room rack, high voltage transmission tower, bridge, vehicle, boiler, vessel, ship, etc.

 3, Widely used in manufacturing mechanical parts which are not required to be with high performance.

 4, Q235CR with grade C or D can be used as steel with special use.

 5, Can be used in making all kinds of mould hand and other unimportant mould parts.

 6, Can be used as punch material.

 

Product Main Points

1, Heat Treatment: normalizing, annealing, tempering, quenching

2, Surface Treatment: black, grinding, bright, polish

3, Product Process: hot rolled, cold drawn, forged

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Carbon Structural Steel Square Bars Q235CR

 

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Carbon Structural Steel Square Bars Q235CR

 

About Us

Carbon Structural Steel Square Bars Q235CR

Carbon Structural Steel Square Bars Q235CR

 

Q:What is the difference between a hot rolled and a turned steel round bar?
A hot rolled steel round bar is produced by heating the steel billet to high temperatures and then rolling it into its final shape, resulting in a rough surface finish. On the other hand, a turned steel round bar is produced by machining the steel bar using a lathe, which creates a smooth and polished surface finish.
Q:What are the environmental impacts of steel round bar production?
The production of steel round bars has several environmental impacts. Firstly, the extraction of raw materials such as iron ore and coal required for steel production leads to habitat destruction, deforestation, and disruption of ecosystems. Mining activities also generate large amounts of waste, including tailings and waste rock, which can contaminate soil, water bodies, and air. The process of converting iron ore into steel involves high energy consumption, primarily from fossil fuels. The burning of these fuels releases greenhouse gases, such as carbon dioxide and nitrogen oxides, contributing to climate change and air pollution. Additionally, steel production releases particulate matter, sulfur dioxide, and other pollutants that can have detrimental effects on human health and ecosystems. Steel manufacturing also requires significant amounts of water for cooling, cleaning, and processing. This can lead to water scarcity and pollution if proper water management practices are not in place. Discharge of untreated or inadequately treated wastewater from steel production can contaminate nearby water sources, affecting aquatic life and potentially harming human populations who rely on these water bodies. Furthermore, the transportation of raw materials and finished steel products over long distances contributes to carbon emissions and air pollution. The energy-intensive nature of steel production and transportation further exacerbates the overall environmental impacts of the industry. To mitigate these environmental impacts, the steel industry has been implementing various measures. These include the use of more efficient technologies, such as recycling and minimization of waste, improving energy efficiency, and adopting cleaner production processes. Additionally, the industry has been focusing on reducing its carbon footprint by increasing the use of renewable energy sources and implementing carbon capture and storage technologies. Overall, while steel round bar production contributes to environmental degradation, there are ongoing efforts within the industry to minimize its negative impacts and transition towards more sustainable practices.
Q:What is the difference between a bright and a cold finished steel round bar?
A bright steel round bar and a cold finished steel round bar are two distinct types of steel bars that differ in their manufacturing processes and resulting characteristics. A bright steel round bar, also known as a turned or polished bar, undergoes a process called turning or polishing. During this process, the rough steel bar is rotated on a lathe machine and a cutting tool is applied to remove the outer layer of the bar, resulting in a smooth and shiny surface. This process not only enhances the appearance of the bar but also improves its dimensional accuracy and surface finish. Bright steel round bars are commonly used in applications where aesthetics and a high-quality surface finish are important, such as architectural components, decorative items, and certain automotive parts. On the other hand, a cold finished steel round bar undergoes a different manufacturing process called cold drawing or cold rolling. In this process, the hot-rolled steel bar is passed through a series of dies at room temperature, reducing its diameter and increasing its length. This cold working process gives the steel bar improved mechanical properties, such as increased tensile strength, improved yield strength, and enhanced dimensional accuracy. Cold finished steel round bars are often used in applications that require high strength and precision, such as shafts, gears, bolts, and tools. In summary, the main difference between a bright steel round bar and a cold finished steel round bar lies in their manufacturing processes and resulting characteristics. While a bright steel round bar is turned or polished to achieve a smooth and shiny surface, a cold finished steel round bar undergoes cold drawing or rolling to enhance its mechanical properties and dimensional accuracy. The choice between these two types of steel bars depends on the specific requirements of the application, such as the need for aesthetics, surface finish, strength, or precision.
Q:What are the different types of steel round bars used in the automotive chassis components?
There is a wide range of steel round bars commonly employed in automotive chassis components. These bars are selected based on their unique properties and performance criteria for different parts of the chassis. 1. Mild Steel Round Bars: Automotive chassis components often utilize mild steel round bars due to their well-balanced combination of strength, durability, and cost-effectiveness. These bars find application in various chassis parts such as brackets, supports, and reinforcements. 2. High-Strength Low-Alloy (HSLA) Steel Round Bars: HSLA steel round bars are crafted by combining low carbon content with small quantities of alloying elements like manganese, phosphorus, and chromium. This steel variant offers superior strength and enhanced formability compared to mild steel. Chassis components that demand critical performance, such as control arms, suspension components, and steering linkages, frequently incorporate HSLA steel round bars. 3. Boron Steel Round Bars: Boron steel round bars are renowned for their exceptional strength and resistance to deformation. These bars are alloyed with boron, which imparts high hardenability and toughness to the steel. Safety-critical chassis components like reinforced door beams and crash structures primarily employ boron steel round bars. 4. Stainless Steel Round Bars: Stainless steel round bars exhibit corrosion resistance alongside excellent strength and durability. While they are not as commonly employed in automotive chassis components, stainless steel round bars may be utilized in specialized parts that necessitate resistance to rust and corrosion, such as exhaust system components or parts exposed to harsh environmental conditions. 5. Alloy Steel Round Bars: Alloy steel round bars are produced by incorporating various alloying elements like nickel, chromium, and molybdenum to enhance specific properties such as strength, hardness, and wear resistance. These bars frequently find application in high-performance chassis components like drive shafts, axles, and gears. To summarize, the types of steel round bars utilized in automotive chassis components encompass mild steel, high-strength low-alloy steel, boron steel, stainless steel, and alloy steel. The selection of the appropriate type depends on the specific requirements of each component, including strength, durability, formability, and corrosion resistance.
Q:Can steel round bars be used in construction?
Indeed, construction projects frequently make use of steel round bars. These bars possess a remarkable adaptability and are extensively utilized in a variety of construction endeavors. In particular, they are widely employed as reinforcement elements within concrete structures, like beams, columns, and foundations. By incorporating steel round bars, the construction gains heightened durability and resilience, thereby rendering it capable of withstanding substantial loads without succumbing to bending or fracturing. Furthermore, these bars find application in the establishment of bridges, buildings, and other structures that necessitate exceptional robustness and stability. Moreover, steel round bars are frequently employed for fabrication purposes, such as the creation of metal frameworks and supports. All in all, owing to their formidable strength, resilience, and versatility, steel round bars are deemed a dependable and frequently employed construction material.
Q:What is the difference between a polished and a hot rolled steel round bar?
The main difference between a polished and a hot rolled steel round bar lies in their manufacturing processes and the resulting surface finish. Hot rolled steel round bars are produced by heating a steel billet or ingot to high temperatures and then rolling it into the desired shape, typically a round bar. This process results in a rough and uneven surface finish with mill scale and imperfections. The hot rolled bars are generally used for applications where surface finish is not critical, such as structural components, machinery parts, and construction materials. On the other hand, polished steel round bars undergo additional processing to achieve a smooth and shiny surface finish. After the hot rolling process, the bars are processed through various grinding and polishing techniques to remove the mill scale, surface imperfections, and achieve a uniform finish. This results in a refined and aesthetically pleasing surface that is suitable for applications where appearance and visual appeal matter, such as decorative items, furniture, and architectural components. In addition to the surface finish, the mechanical properties of the two types of steel round bars can also differ. The hot rolled bars generally have a rougher surface and may exhibit some residual stresses, while the polished bars have a smoother surface and reduced internal stresses. However, the overall mechanical properties, such as strength and hardness, are primarily determined by the grade and composition of the steel used, rather than the manufacturing process or surface finish. In summary, the difference between a polished and a hot rolled steel round bar lies in their surface finish. Hot rolled bars have a rough and uneven surface with mill scale and imperfections, while polished bars undergo additional processing to achieve a smooth and shiny finish. The choice between the two depends on the specific application and the desired appearance of the final product.
Q:What are the different welding techniques for steel round bars?
Steel round bars can be welded using various techniques. Here are some commonly used ones: 1. Stick welding, also known as Shielded Metal Arc Welding (SMAW): This technique involves using an electrode coated in flux to create an electric arc between the electrode and the workpiece. The base metal melts, resulting in a weld. 2. Gas Metal Arc Welding (GMAW), commonly referred to as MIG (Metal Inert Gas) welding: In this technique, a wire electrode is fed through a welding gun. It combines with a shielding gas to create a weld. 3. Flux-Cored Arc Welding (FCAW): Similar to GMAW, FCAW uses a continuously fed electrode. However, instead of a solid wire electrode, it uses a tubular electrode filled with flux. This flux protects the weld and adds strength. 4. Tungsten Inert Gas (TIG) welding, also known as Gas Tungsten Arc Welding (GTAW): This precise technique involves using a non-consumable tungsten electrode to create an arc. Additional material may be added using a filler rod. 5. Submerged Arc Welding (SAW): This technique is suitable for heavy-duty applications, such as welding steel round bars for structural purposes. The arc and welding zone are submerged in granular flux, providing protection and deep penetration. Each technique has its advantages and is suitable for specific applications. Factors like round bar thickness, required weld strength, and accessibility of the welding site should be considered when selecting the appropriate technique for a strong and durable weld on steel round bars.
Q:What are the different types of steel round bar alloys for improved wear resistance?
Some common types of steel round bar alloys that are known for improved wear resistance include tool steels, stainless steels, and alloy steels. These alloys are specifically designed to withstand wear and abrasion, making them suitable for various applications such as cutting tools, machinery components, and automotive parts.
Q:Are steel round bars suitable for the production of valves?
Yes, steel round bars are suitable for the production of valves. Steel is a strong and durable material that can withstand high pressure and temperature conditions commonly encountered in valve applications. The round shape of the bars allows for easy machining and shaping of various valve components. Additionally, steel offers excellent corrosion resistance, making it an ideal choice for valves used in industries such as oil and gas, chemical, and water treatment.
Q:What are the different joining methods for steel round bars?
There are several different joining methods for steel round bars, including welding, brazing, and mechanical fastening. Welding involves melting the ends of the bars and fusing them together, creating a strong bond. Brazing is a similar process but uses a lower temperature filler metal to join the bars. Mechanical fastening methods, such as using bolts or screws, involve securing the bars together with external connectors. The choice of joining method depends on factors such as the application, desired strength, and ease of implementation.

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