• Hot Rolled Mild Steel Round Bar Q235 Q345 Q355 System 1
  • Hot Rolled Mild Steel Round Bar Q235 Q345 Q355 System 2
  • Hot Rolled Mild Steel Round Bar Q235 Q345 Q355 System 3
  • Hot Rolled Mild Steel Round Bar Q235 Q345 Q355 System 4
  • Hot Rolled Mild Steel Round Bar Q235 Q345 Q355 System 5
  • Hot Rolled Mild Steel Round Bar Q235 Q345 Q355 System 6
Hot Rolled Mild Steel Round Bar Q235 Q345 Q355

Hot Rolled Mild Steel Round Bar Q235 Q345 Q355

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Loading Port:
Tianjin
Payment Terms:
TT OR LC
Min Order Qty:
3 m.t.
Supply Capability:
10000 m.t./month

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Item specifice

Type:
Carbon Steel
Shape:
Steel Round Bar

 Hot Rolled Mild Steel Round Bar Q235 Q345 Q355

Name

SAE1045 Carbon Steel Round Bar

Shape

Round Bar/Square Bar/Flat Bar/Plate/Wire

Standard

GB/ASTM/SAE/AISI/DIN/JIS/EN/BS

Surface Treatment:

Black/Peeling/Polished/Machined  

Delivery Condition:

Hot Rolled or Forged/Peeled or Black Surface

Test

SGS/UT 100% Elements Testing

Certificate:

ISO/Mill Certificate

Service:

24 hours online service /

more than 20 years trading and manufacture 

Quality Assurance:

the third party inspection, such as SGS, BV, TUV…etc. is acceptable

Packaging Details:

seaworthy packaging or as per customer's packing instruction

 

Products Overview

Product Name

Typical Grades

Diameter(mm)

Standard adopted

Carbon Steel

20 (1020/S20C/C22)

Ø16-Ø300

GB/SAE/JIS/DIN

40 (1040/S40C/C40)

45 (1045/S45C/C45)

Bearing Steel

GCr9 (51100/SUJ1)

Ø12-Ø250

GCr15 (52100/SUJ2/100Gr6)

GCr9SiMn (A485-Gr.1/SUJ3)

Cr-Mo Steel

20Cr (5120/SCr420H/20Cr4)

Ø12-Ø250

40Cr (5140/SCr440/41Cr4)

42CrMo(4140/SCM440/42CrMo4)

Gear Steel

20CrNiMo

Ø16-Ø600

20CrMn(5115/SMnC420/20MnCr5)

20CrNiMo(8620/SNCM220/20CrMiMo2)

Packaging & Delivery

Packaging Detail

Sea worthy packing /as per customer's packing instruction

Delivery Detail

15 ~ 40 days after receiving the deposit

Hot Rolled Mild Steel Round Bar Q235 Q345 Q355

Product Show

Hot Rolled Mild Steel Round Bar Q235 Q345 Q355

 

Workshop

Hot Rolled Mild Steel Round Bar Q235 Q345 Q355

FAQ

Are you a trading company or manufacturer?

Manufacturer

What’s the MOQ?

3 metric ton

What’s your delivery time? 

15-35 days after downpayment received

Do you Accept OEM service?

Yes

what’s your delivery terms?

FOB/CFR/CIF

What's the Payment Terms?

30% as deposit,70% before shipment by T/T

Western Union acceptable for small amount.

L/C acceptable for large amount.

Scrow ,Paybal,Alipay are also ok 

Why  choose  us?

Chose happens because of quality, then price, We can give you both. 

Additionally, we can also offer professional products inquiry, products knowledge train (for agents), smooth goods delivery, excellent customer solution proposals.

What's your available port of Shipment?

Main Port, China

What’s your featured  services?

Our service formula: good quality+ good price+ good service=customer's trust

Where are your Market?

Covering more than 160 countries in the world

 

Q:How does special steel perform in corrosive environments?
Special steel is specifically designed to perform well in corrosive environments. It is made with a higher content of alloying elements such as chromium, which forms a protective oxide layer on the surface of the steel. This oxide layer acts as a barrier, preventing the steel from coming into direct contact with the corrosive elements in the environment. Additionally, special steel may also contain other alloying elements such as molybdenum, nickel, or copper, which further enhance its resistance to corrosion. These elements help to increase the steel's ability to withstand pitting, crevice corrosion, and stress corrosion cracking, which are common types of corrosion that occur in corrosive environments. Furthermore, special steel is often treated with various surface coatings or finishes that provide additional protection against corrosion. These coatings can include zinc, epoxy, or polymeric materials, which create an additional barrier between the steel and the corrosive elements. In summary, special steel performs exceptionally well in corrosive environments due to its high content of alloying elements, protective oxide layer, and additional surface coatings. It offers excellent resistance to various forms of corrosion and ensures the longevity and reliability of structures or equipment operating in such environments.
Q:What is the role of cobalt in special steel?
Due to its unique properties and characteristics, cobalt plays a crucial role in special steel. It serves as a significant alloying element in the production of high-performance steel alloys, particularly those used in demanding applications where strength, hardness, and heat resistance are vital. Cobalt's primary function in special steel is to enhance its overall strength and toughness. By forming a solid solution with iron, cobalt creates a fine-grained microstructure that improves the mechanical properties of the steel. This results in increased hardness, wear resistance, and the ability to withstand high temperatures and harsh environments. Moreover, cobalt improves the steel's resistance to corrosion and oxidation, making it suitable for extreme conditions in industries like aerospace, oil and gas, and automotive. Additionally, it enhances the steel's magnetic properties, making it valuable in electrical and electronic devices. Another essential role of cobalt in special steel is its ability to facilitate the formation of stable carbides. The addition of cobalt aids in the precipitation and dispersion of carbides, contributing to the steel's high-temperature strength and excellent retention of hardness at elevated temperatures. Furthermore, cobalt assists in refining the grain structure of the steel, resulting in improved machinability and surface finish. It also allows for better control over the hardenability of the steel, determining its capacity for heat treatment and achieving desired hardness levels. To summarize, cobalt plays a multifaceted and indispensable role in special steel. It enhances the steel's strength, hardness, and toughness, improves its resistance to corrosion and oxidation, and enables it to withstand high temperatures. Cobalt also aids in refining the microstructure of the steel, enhancing machinability and allowing precise control over its hardenability.
Q:What are the factors that can affect the machinability of special steel?
Special steel's machinability can be impacted by various factors. The composition of the steel is one of the main factors. The presence of specific elements like carbon, chromium, and nickel can significantly influence machinability. For instance, higher carbon content can lead to increased hardness and brittleness, making machining more challenging. Conversely, the addition of elements like sulfur and lead can enhance machinability by promoting chip formation and reducing friction. Machinability is also affected by the heat treatment of the steel. Different heat treatments, such as annealing or quenching, can modify the steel's microstructure, impacting its hardness and toughness. Heat-treated steels may be more difficult to machine due to their increased hardness or the presence of residual stresses. Mechanical properties of special steel, including hardness and tensile strength, also have an impact on machinability. Harder steels require greater cutting force, which can result in increased tool wear or vibration during machining. Similarly, steels with high tensile strength can pose challenges in terms of chip formation and tool life. Furthermore, machinability is influenced by the cutting conditions and machining parameters used. Factors such as cutting speed, feed rate, and depth of cut can have a significant impact on the process. High cutting speeds can lead to elevated temperatures and tool wear, while low cutting speeds may result in poor surface finish. Additionally, the choice of cutting tools, their geometry, and their coatings can also affect the machinability of special steel. Lastly, the presence of impurities or contaminants in the steel, such as non-metallic inclusions or surface defects, can have a negative impact on machinability. These impurities can cause tool wear, poor surface finish, or even tool breakage. Therefore, ensuring the quality and cleanliness of the steel is crucial for achieving good machinability. In conclusion, factors such as composition, heat treatment, mechanical properties, cutting conditions, and the presence of impurities can affect the machinability of special steel. Understanding and optimizing these factors can help improve machinability and enhance the overall performance of special steel during machining operations.
Q:What are the factors that affect the mechanical properties of special steel?
The mechanical properties of special steel are influenced by several factors, including the chemical composition of the steel, the heat treatment process, the presence of impurities or alloying elements, the microstructure of the steel, and the manufacturing process used. Additionally, factors such as grain size, hardness, tensile strength, ductility, and toughness also play a significant role in determining the overall mechanical properties of special steel.
Q:How does special steel compare to other materials, such as aluminum or titanium?
Special steel is known for its exceptional strength, durability, and versatility, making it a preferred choice in various industries. When compared to other materials like aluminum or titanium, special steel often offers superior mechanical properties, including higher tensile strength, hardness, and wear resistance. It also generally has better thermal conductivity and is more resistant to corrosion. However, aluminum and titanium have their own advantages, such as being lighter in weight and having better overall corrosion resistance. Ultimately, the choice between special steel, aluminum, or titanium depends on the specific application, considering factors like strength requirements, weight limitations, cost-effectiveness, and environmental conditions.
Q:What are the challenges in working with special steel?
When it comes to working with special steel, there are several distinct challenges that set it apart from regular steel. Let's take a look at some of the main difficulties one might encounter in this field: 1. Expensive nature: Special steels often come with higher production costs due to their unique composition and properties. The raw materials used in their production may be scarce or require intricate manufacturing processes, resulting in increased expenses. 2. Limited availability: Special steels are not as readily accessible as regular steels, making it more arduous to source them. This limited availability can lead to longer lead times and potentially higher costs when attempting to obtain the necessary materials. 3. Machining complexity: Special steels can prove challenging to machine due to their elevated hardness or toughness. Their distinctive properties may cause excessive tool wear, resulting in increased machining time and costs. Overcoming these challenges may necessitate the use of specialized cutting tools and machining techniques. 4. Heat treatment requirements: Achieving the desired mechanical properties of special steels often demands precise and specific heat treatment processes. The complexity of heat treatment lies in the careful control of temperature, time, and cooling rates. Improper heat treatment can result in inconsistent material properties or even material failure. 5. Welding difficulties: In comparison to regular steels, certain special steels may exhibit poor weldability. They may be prone to cracking or require preheating and post-weld heat treatment to ensure proper joint integrity. This can introduce complexity and cost to welding processes. 6. Corrosion susceptibility: While special steels may possess excellent mechanical properties, they can sometimes be more vulnerable to corrosion when compared to regular steels. This necessitates additional measures to protect the steel from corrosion, such as applying protective coatings or utilizing corrosion-resistant alloys. 7. Knowledge and expertise requirements: Working with special steels typically demands a higher level of technical knowledge and expertise. The unique properties and characteristics of these materials necessitate a deep understanding of their behavior and effective handling. This may call for specialized training or collaboration with experts in the field. Despite these challenges, working with special steel also offers various benefits, including superior strength, durability, and performance in specific applications. By comprehending and addressing these challenges, engineers and manufacturers can leverage the unique properties of special steel to develop innovative and high-quality products.
Q:How does special steel contribute to the manufacturing of automotive engine components?
The manufacturing of automotive engine components heavily relies on special steel to enhance their strength, durability, and performance. Special steel possesses unique properties that make it suitable for critical engine parts like crankshafts, camshafts, connecting rods, valve springs, and cylinder heads. The exceptional strength of special steel is one of its primary advantages in automotive engine components. Engine parts made from special steel can withstand high stress, heavy loads, and extreme temperatures without experiencing deformation or failure. This strength ensures that the engine operates efficiently and reliably, even under demanding conditions. Furthermore, special steel offers superior durability, which is crucial for the longevity and performance of engine components. Its resistance to wear, corrosion, and fatigue ensures that the engine parts maintain their functionality for an extended period. This durability translates into increased lifespan and reduced maintenance requirements for the engine, resulting in higher customer satisfaction and lower costs for vehicle owners. The use of special steel in automotive engine components also contributes to improved performance. Special steel allows for the creation of lightweight components, reducing the overall weight of the engine and enhancing fuel efficiency. Additionally, the high precision and dimensional accuracy achievable with special steel manufacturing processes result in better engine performance, reduced friction, and improved power output. Moreover, special steel exhibits excellent machinability, simplifying the manufacturing process of engine components. Its ability to be easily formed, cut, and shaped enables the production of complex designs and intricate features, leading to enhanced efficiency and performance in the final product. In conclusion, special steel plays a vital role in the manufacturing of automotive engine components due to its exceptional strength, durability, and performance. Its usage results in engines that are more reliable, efficient, and long-lasting, ultimately contributing to the overall quality and satisfaction of vehicles.
Q:How does special steel contribute to the renewable energy industry?
Special steel contributes to the renewable energy industry by providing durable and high-performance materials for various applications. It is used in the construction of wind turbines, solar panels, and hydroelectric power plants, enhancing their efficiency and longevity. Special steel also plays a crucial role in the manufacturing of energy storage systems, such as batteries, ensuring their reliability and safety. Overall, special steel enables the renewable energy sector to achieve higher energy output, reduce carbon emissions, and accelerate the global transition to sustainable sources of power.
Q:How does the heat treatment process affect the hardness of special steel?
The hardness of special steel is greatly influenced by the heat treatment process. This process involves heating the steel to a specific temperature, maintaining it at that temperature for a certain period, and then cooling it at a controlled rate. By altering the microstructure of the steel, the heat treatment process impacts its hardness. Quenching, which is one of the most commonly used heat treatment techniques, involves rapidly cooling the steel. This results in the formation of martensite, a hard and brittle microstructure. The rapid cooling prevents the formation of softer microstructures like pearlite or ferrite, leading to an increase in the steel's hardness. Tempering is another heat treatment process that affects the hardness of special steel. After quenching, the steel is often tempered to decrease its brittleness and enhance its toughness. This involves reheating the quenched steel to a lower temperature and then slowly cooling it. Through this process, some of the martensite transforms into a more ductile microstructure, such as tempered martensite or bainite. These microstructures retain some of the hardness of martensite while also providing improved toughness and resistance to fracture. To summarize, the heat treatment process plays a significant role in determining the hardness of special steel. Quenching increases hardness by forming martensite, whereas tempering balances hardness with improved toughness. By adjusting parameters such as temperature and cooling rate, the desired hardness and mechanical properties can be achieved for different applications of special steel.
Q:What are the properties of corrosion-resistant stainless steel?
Corrosion-resistant stainless steel possesses a unique combination of properties that make it highly resistant to corrosion. These properties include a high level of chromium content, which forms a protective oxide layer on the surface of the steel, preventing further corrosion. Additionally, it has low carbon content, which further enhances its corrosion resistance. The presence of other alloying elements like nickel and molybdenum also contributes to its resistance against corrosion in various environments, making it suitable for a wide range of applications.

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