Carbon Steel C30/C35/C40/C45/C50/C55/C58 Round Bars

Carbon Steel C30/C35/C40/C45/C50/C55/C58 Round Bars System 1

Carbon Steel C30/C35/C40/C45/C50/C55/C58 Round Bars System 2

Carbon Steel C30/C35/C40/C45/C50/C55/C58 Round Bars System 3

Carbon Steel C30/C35/C40/C45/C50/C55/C58 Round Bars System 4

Carbon Steel C30/C35/C40/C45/C50/C55/C58 Round Bars

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Loading Port:: Shanghai

Payment Terms:: TT OR LC

Min Order Qty:: 30 m.t.

Supply Capability:: 120000 m.t./month

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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)

Company Information

CNBM International Corporation is the most important trading platform of CNBM group.

Whith its advantages, CNBM International are mainly concentrate on Cement, Glass, Iron and Steel, Ceramics industries and devotes herself for supplying high qulity series of refractories as well as technical consultancies and logistics solutions.

FAQ

1, Your advantages?

professional products inquiry, products knowledge train (for agents), smooth goods delivery, excellent customer solution proposale

2, Test & Certificate?

SGS test is available, customer inspection before shipping is welcome, third party inspection is no problem

3, Factory or Trading Company?

CNBM is a trading company but we have so many protocol factories and CNBM works as a trading department of these factories. Also CNBM is the holding company of many factories.

4, Payment Terms?

30% TT as deposit and 70% before delivery.

Irrevocable L/C at sight.

5, Trading Terms?

EXW, FOB, CIF, FFR, CNF

6, After-sale Service?

CNBM provides the services and support you need for every step of our cooperation. We're the business partner you can trust.

For any problem, please kindly contact us at any your convenient time.

We'll reply you in our first priority within 24 hours.

Packaging & Delivery

1, Packaging: seaworthy package or as required

2, Delivery: 35-45 days or based on quantity

Q: What are the advantages of using nickel-manganese alloy steel round bars?: Nickel-manganese alloy steel round bars provide numerous benefits in various applications. To begin with, these round bars exhibit exceptional strength and toughness. The incorporation of nickel and manganese significantly enhances the overall strength and durability of the steel, rendering it suitable for heavy-duty applications that demand high strength and resistance to wear and tear. As a result, industries such as construction, automotive, and manufacturing find these alloy steel round bars highly advantageous. Additionally, nickel-manganese alloy steel round bars possess outstanding corrosion resistance properties. The nickel content in the alloy imparts remarkable resistance to corrosion, making it ideal for use in harsh environments or situations where exposure to corrosive substances is common. Consequently, the lifespan of these round bars is extended, reducing the need for frequent maintenance or replacement. Moreover, these round bars demonstrate excellent heat resistance. They can withstand elevated temperatures without compromising their structural integrity, making them suitable for applications involving extreme heat or thermal cycles. Industries like aerospace, power generation, and oil and gas greatly benefit from this heat resistance property. Furthermore, nickel-manganese alloy steel round bars offer favorable weldability and machinability. The composition of the alloy facilitates easy welding and machining, allowing manufacturers to fabricate components or structures with ease. This versatility in processing makes the round bars highly adaptable to varying manufacturing processes and requirements. Moreover, these round bars exhibit good ductility and formability. The alloy's composition permits easy shaping or forming into various configurations without sacrificing its structural integrity. Consequently, they are suitable for applications that necessitate complex shapes or intricate designs. In conclusion, the advantages of utilizing nickel-manganese alloy steel round bars encompass exceptional strength, corrosion resistance, heat resistance, weldability, machinability, and formability. These properties make these round bars a dependable and versatile choice for a broad range of applications across different industries.

Q: What are the advantages of using nickel-chromium-cobalt alloy steel round bars?: Nickel-chromium-cobalt alloy steel round bars offer several benefits. To begin with, this type of alloy steel boasts remarkable resistance to corrosion. It can endure harsh conditions such as extreme temperatures, humidity, and exposure to chemicals without succumbing to rust or corrosion. This makes it highly suitable for industries like aerospace, marine, and chemical processing, where durability and longevity are of utmost importance. Furthermore, nickel-chromium-cobalt alloy steel round bars possess exceptional strength and toughness. They have a high tensile strength and can withstand heavy loads and impacts without deforming or breaking. This makes them ideal for applications that require structural integrity and resistance to deformation, such as in the construction industry or in the manufacturing of heavy machinery. Moreover, this alloy steel exhibits excellent heat resistance. It can endure elevated temperatures without compromising its mechanical properties, making it perfect for applications in power generation, oil and gas exploration, or furnace components. Additionally, nickel-chromium-cobalt alloy steel round bars offer good wear resistance. They can withstand abrasive conditions, such as friction and wear, without experiencing significant deterioration. This makes them suitable for applications like tooling, machining, and wear components, where durability and resistance to wear are crucial. Lastly, nickel-chromium-cobalt alloy steel round bars are highly versatile. They can be easily machined, welded, and formed into various shapes, making them adaptable to a wide range of applications. Their versatility allows for customization and flexibility in design and manufacturing processes. In conclusion, the benefits of using nickel-chromium-cobalt alloy steel round bars encompass excellent corrosion resistance, high strength and toughness, heat resistance, good wear resistance, and versatility. These qualities make them the preferred choice in various industries, where reliability, durability, and performance are paramount.

Q: What are the different types of steel round bar coatings used in the oil and gas industry?: There are several types of steel round bar coatings commonly used in the oil and gas industry. Some of these coatings include fusion bonded epoxy (FBE), three-layer polyethylene (3LPE), three-layer polypropylene (3LPP), and metallic zinc coatings. These coatings are applied to steel round bars to provide corrosion resistance, enhance durability, and protect against harsh environmental conditions in oil and gas applications.

Q: How are steel round bars stored?: Steel round bars are typically stored in a way that ensures their safety and easy access. One common method of storage is to stack the bars horizontally on a pallet or rack system. The bars are often bundled together and secured with straps or wire to prevent them from rolling or shifting. Another approach is to store them vertically in racks, with each bar placed in a designated slot to prevent any contact or damage. In both cases, it is important to maintain proper spacing between the bars to allow for adequate air circulation and to prevent any potential corrosion. Additionally, steel round bars should be stored in a dry and covered area to protect them from moisture, dust, and other environmental elements. Proper labeling and inventory management systems are also crucial to ensure easy identification and retrieval of the bars when needed.

Q: What are the different types of steel round bar surface defects?: There are several different types of surface defects that can occur on steel round bars. Some of the most common defects include: 1. Scale: This is a thin layer of oxide that forms on the surface of the steel during the manufacturing process. It appears as a rough, flaky or scaly texture and can be easily removed by pickling or abrasive cleaning. 2. Pitting: Pitting is a localized corrosion that appears as small, shallow holes or depressions on the surface of the steel. It is typically caused by exposure to corrosive substances or environments and can weaken the material if left untreated. 3. Surface cracks: These are small, visible cracks that appear on the surface of the steel round bar. They can be caused by various factors such as improper cooling during the manufacturing process, excessive stress, or improper handling. Surface cracks can reduce the structural integrity of the steel and should be carefully inspected and repaired if necessary. 4. Decarburization: This defect occurs when the surface layer of the steel loses its carbon content, leading to reduced hardness and strength. Decarburization is often caused by high temperatures during heat treatment or improper cooling methods. It can be detected through visual inspection or by conducting hardness tests. 5. Lamination: Lamination defects occur when there are layers or flakes within the steel round bar. These layers can cause weakness in the material and compromise its structural integrity. Lamination defects are typically caused by improper rolling or excessive impurities in the steel. 6. Inclusions: Inclusions are foreign materials or impurities that are trapped within the steel during the manufacturing process. They can appear as dark spots, streaks, or irregular shapes on the surface of the round bar. Inclusions can reduce the strength and ductility of the steel and can be caused by factors such as improper raw material quality or inadequate refining processes. It is important to note that surface defects in steel round bars can vary in severity and impact on the material's performance. Regular inspection and quality control measures are essential to identify and rectify any surface defects to ensure the integrity and reliability of the steel round bar.

Q: How do steel round bars contribute to sustainable construction?: There are multiple ways in which steel round bars contribute to sustainable construction. To begin with, steel is an incredibly durable and long-lasting material. Known for its strength and resilience, steel round bars can withstand heavy loads and extreme weather conditions. This durability ensures that structures built with steel round bars have a longer lifespan, reducing the need for frequent repairs or replacements. As a result, money is saved and the environmental impact associated with the production and disposal of construction materials is reduced. Furthermore, steel is highly recyclable. When a structure reaches the end of its life cycle, the steel round bars can be easily and efficiently recycled. This reduces the demand for virgin steel production, which is both energy-intensive and environmentally harmful. Additionally, recycling steel helps to minimize waste in landfills and conserve natural resources. Moreover, steel round bars can be prefabricated off-site, providing several environmental benefits. This process allows for greater precision and efficiency in construction, reducing material waste and energy consumption. It also minimizes noise, dust, and pollution on-site, making construction projects more sustainable and less disruptive to the surrounding environment. Additionally, steel round bars are frequently used in sustainable building designs. Steel structures can be designed to maximize natural light and ventilation, thereby reducing the need for artificial lighting and air conditioning. This improves energy efficiency and decreases greenhouse gas emissions. Additionally, steel's versatility enables flexible and adaptable designs, making future modifications and extensions easier without significant demolition or waste generation. Lastly, steel round bars are commonly utilized in the construction of green buildings and sustainable infrastructure. These structures are designed to minimize their environmental impact throughout their entire life cycle, from construction to operation and eventual decommissioning. Steel's attributes, such as recyclability, durability, and energy efficiency, make it a preferred choice in sustainable construction practices. In conclusion, steel round bars contribute to sustainable construction through their durability, recyclability, prefabrication opportunities, energy efficiency, and versatility. Incorporating steel into construction projects allows for waste reduction, resource conservation, minimal environmental impact, and the creation of long-lasting structures.

Q: What is the tolerance for diameter and length of steel round bars?: The tolerance of steel round bars' diameter and length may vary depending on industry standards and requirements. Typically, diameter tolerances are specified as a deviation, either positive or negative, from the nominal diameter. For example, a tolerance of +/- 0.005 inches implies that the actual diameter can deviate by up to 0.005 inches from the nominal diameter. Similarly, length tolerances are also expressed as a deviation, either positive or negative, from the nominal length. These tolerances can be indicated as a percentage or an absolute value. For instance, a tolerance of +/- 1% or +/- 0.5 inches means that the actual length can deviate by up to 1% of the nominal length or 0.5 inches, whichever is greater. It's worth noting that different industries may have diverse tolerance requirements depending on the specific applications and intended use of steel round bars. Hence, it is vital to refer to the relevant industry standards or consult with the manufacturer or supplier to determine the precise tolerance specifications for diameter and length in a specific context.

Q: What is the maximum manganese content allowed for steel round bars?: The maximum manganese content allowed for steel round bars can vary depending on the specific grade or standard being followed. In general, the manganese content in steel round bars is typically limited to a maximum of around 1.65% by weight. This is because higher levels of manganese can negatively impact the mechanical properties and weldability of the steel. However, it is important to note that different industries or applications may have their own specific requirements or allowances for manganese content in steel round bars. Therefore, it is always advisable to consult the relevant specifications or standards to determine the maximum manganese content allowed for a particular grade of steel round bars.

Q: How do you determine the strength and hardness of a steel round bar?: To determine the strength and hardness of a steel round bar, several tests and techniques can be employed. One of the most common methods is the tensile strength test. In this test, a sample of the steel round bar is subjected to a gradually increasing load until it reaches its breaking point. The maximum load it can withstand before breaking is recorded, which gives an indication of the bar's strength. Hardness testing is another crucial measure of steel round bar quality. The Rockwell hardness test is frequently used, where a diamond or tungsten carbide ball is pressed into the surface of the bar with a specific load. The depth of the indentation made by the ball is measured, and the hardness value is determined based on a standardized scale. Additionally, the Brinell hardness test can be utilized, where a hardened steel ball is pressed into the surface of the round bar with a specific load. The diameter of the indentation formed is measured, and the hardness is calculated based on the applied load and the size of the indentation. Furthermore, there are non-destructive techniques such as ultrasonic testing and magnetic particle inspection that can provide information about the internal structure, defects, and cracks within the steel round bar, thus indirectly indicating its strength and hardness. It is important to note that various factors, including the composition of the steel, its heat treatment, and the manufacturing process, can influence the strength and hardness of a round bar. Therefore, it is advisable to consult standards and specifications that define the expected properties for the specific type of steel round bar being tested.

Q: How do you prevent warping during welding of steel round bars?: To prevent warping during welding of steel round bars, there are several precautions that can be taken: 1. Proper fit-up: Ensure that the round bars are properly aligned and fit together before welding. Any gaps or misalignments can lead to uneven heating and cooling, increasing the chances of warping. 2. Welding sequence: Divide the welding into multiple smaller sections or segments instead of welding continuously along the entire length of the round bar. This will help distribute the heat more evenly and reduce the risk of warping. 3. Welding technique: Use a welding technique that minimizes heat input, such as pulse welding or tack welding. These techniques allow for controlled and intermittent heating, which reduces the chances of warping. 4. Preheating: Preheating the round bars before welding can also help prevent warping. This is especially important for thicker bars or when welding dissimilar metals. Preheating helps to reduce the temperature gradient between the weld and the surrounding material, minimizing the risk of warping. 5. Heat control: Monitor and control the heat input during welding. Excessive heat can cause rapid expansion and contraction, leading to warping. Use appropriate welding parameters, such as lower amperage and shorter welding times, to control the heat input. 6. Welding fixtures: Use welding fixtures or jigs to hold the round bars in place during welding. This helps to maintain proper alignment and prevents movement during the welding process, reducing the chances of warping. 7. Post-welding cooling: Allow the welded round bars to cool down slowly and naturally. Avoid rapid cooling methods like quenching, as they can induce stress and increase the risk of warping. By implementing these measures, the risk of warping during welding of steel round bars can be significantly reduced, resulting in better quality and more reliable welded joints.

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