35cd4 Alloy Structural Steel Round Bars System 1

35cd4 Alloy Structural Steel Round Bars System 2

35cd4 Alloy Structural Steel Round Bars System 3

35cd4 Alloy Structural Steel Round Bars System 4

35cd4 Alloy Structural Steel Round Bars

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Loading Port:: China main port

Payment Terms:: TT OR LC

Min Order Qty:: 50 m.t.

Supply Capability:: 10000 m.t./month

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Grade	Tensile Strength (Mpa)	Yield Strength (Mpa)	Elongation (%)	Reduction of Area (%)	Charpy Impact (J)	Hardness (HB)
35cd4	≥985	≥835	≥12	≥45	≥63	229

Grade	C	Cr	Mo	Si	Mn	P	S	Ni	Cu
35cd4	0.32-0.40	0.80-1.10	0.15-0.25	0.17-0.37	0.40-0.70	≤0.035	≤0.035	≤0.30	≤0.30

Carbon Steel Round Bar	SS400, S235JR,Q235, ASTM A36, Fe360A, Fe360B,SM400A,080A15, SS41,E235B
SAE 1020, AISI 1020, ASTM 1020, S20C, 20#, 050A20
SAE 1045, AISI 1045, ASTM 1045, S45C, 45#,EN8, XC45, XC48, 45B, C45, CK45, CM45, 060A47, R683/IC45e
Alloy Steel Round Bar	40Cr, DIN 1.7035, SAE 5140, AISI 5140, ASTM 5140, SCr440, 41Cr4, 530A40, 42Cr4, 40X, R683/VII3
SAE4140,42CrMo, 42CrMo4, DIN 1.7225, SCM440,EN19, 42CD4, 708M40, R683/II3
SAE 4340, 40CrNiMoA, EN24, SNCM439, 817M40,40XMA, R683/III4
SAE 8620,,AISI 8620, ASTM 8620, 20CrNiMo,SNCM220, 805M20
SAE52100, AISI52100,ASTM E52100, GCr15, SUJ2, 100C6, 100Cr6, 1.3505, 534A99, IIIX15

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)

Carbon Steel	Mold bottom, Plastic mold, Construction machinery parts Automobile parts, Security grills, Screens, Construction
Bearing Steel	Aerospace, Navigation, Nuclear energy, Chemical industry Electronic information, Petrochemical, Instrument and meter Transportation
Cr-Mo Steel	Mechanism & Fasteners gear, Stressed components for vehicles Engines and machines, Parts of larger cross-section
Gear Steel	All kinds of gears, Statically and dynamically stressed component for vehicles Engines and machine, Larger cross-section parts, Crankshafts

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.

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

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

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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.

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30% TT as deposit and 70% before delivery.

Irrevocable L/C at sight.

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EXW, FOB, CIF, FFR, CNF

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

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Packaging & Delivery

1, Packaging: seaworthy package or as required

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

Q: How are steel round bars used in the manufacturing of fasteners and bolts?: Fasteners and bolts often rely on the strength and durability of steel round bars. These bars serve as the primary material for creating the shaft or body of these components. The manufacturing process involves several steps. Initially, the steel round bars are cut to the desired length according to the specifications of the fastener or bolt. Subsequently, the bars are heated to a specific temperature to soften the steel, making it easier to shape. Once heated, the bars are placed in a machine called a thread roller. This machine employs a series of hardened steel dies to form the threads onto the surface of the round bar. By pressing against the rotating bar, the dies create the spiral shape of the threads. This threading process is crucial as it ensures a secure attachment of the fastener or bolt to other components or structures. After the threads are formed, the round bars are trimmed to their final required length for the fastener or bolt, guaranteeing the correct size and fit for the intended application. Finally, the finished round bars undergo further processing to apply necessary surface treatments or coatings. These may include galvanizing or the application of a corrosion-resistant coating to safeguard the fastener or bolt from environmental factors that could compromise its performance. In conclusion, steel round bars play a vital role in the manufacturing of fasteners and bolts. They serve as the main material for the shaft or body, providing the essential strength and durability. Through various manufacturing processes, such as cutting, heating, threading, and surface treatments, these round bars are transformed into high-quality fasteners and bolts, which are integral components across a wide range of industries and applications.

Q: How do you measure the hardness of a steel round bar?: The hardness of a steel round bar can be measured using various methods, with the most common method being the Rockwell hardness test. This test involves applying a specific load to an indenter and measuring the depth of the indentation left on the material's surface. To measure the hardness of a steel round bar using the Rockwell hardness test, the following steps can be followed: 1. Select the appropriate Rockwell scale for the steel being tested. The most commonly used scales for steel are HRC (Rockwell C) and HRB (Rockwell B). 2. Clean the surface of the steel round bar to remove any dirt, oil, or contaminants that could affect the accuracy of the test. 3. Place the steel round bar on a flat and stable surface, ensuring it is properly supported to prevent any movement during testing. 4. Select the appropriate indenter for the chosen Rockwell scale. For HRC, a diamond cone indenter is typically used, while for HRB, a hardened steel ball is used. 5. Apply a preliminary minor load to the indenter, typically 10 kgf (kilogram-force) for HRC and 3 kgf for HRB. This helps ensure proper contact between the indenter and the material's surface. 6. Apply the major load, which is specific to the chosen Rockwell scale. For HRC, it is typically 150 kgf, while for HRB, it is usually 100 kgf. 7. Allow the major load to dwell for a specific period, typically 15 seconds, to ensure proper indentation. 8. Release the major load while keeping the minor load applied. This allows the indenter to partially recover, reducing the depth of the indentation. 9. Measure the depth of the remaining indentation using a microscope or a specialized Rockwell hardness testing machine. The measured value corresponds to the hardness value on the chosen Rockwell scale. It is important to note that the Rockwell hardness test is just one of several methods available to measure the hardness of a steel round bar. Other methods, such as the Brinell hardness test or the Vickers hardness test, may also be used depending on the specific requirements of the application.

Q: Can steel round bars be used for making turbine blades?: Using steel round bars to make turbine blades is not possible. Turbine blades experience high temperatures and extreme forces, so they need to be durable and flexible. Steel round bars do not have the required properties to endure these conditions. Usually, turbine blades are constructed from materials like titanium alloys or advanced composites, which have a high strength-to-weight ratio, exceptional fatigue resistance, and thermal stability. These materials are purposely designed to withstand the challenging conditions of turbine operations, ensuring efficiency and reliability.

Q: How do you calculate the moment of inertia of a steel round bar?: In order to determine the moment of inertia for a steel round bar, one must possess knowledge of the bar's dimensions and properties. The moment of inertia serves as a gauge for an object's resistance to rotational changes. The formula utilized to compute the moment of inertia for a solid cylindrical item, such as a round bar, is as follows: I = (π/4) * D^4, where I signifies the moment of inertia and D symbolizes the bar's diameter. Initially, ascertain the diameter of the steel round bar by means of a caliper or ruler. It is essential to measure the diameter at its broadest point, typically found at the center. Subsequently, input the measured diameter into the formula and calculate the moment of inertia. It is crucial to use the correct units for diameter, such as inches or millimeters, to maintain consistency with the formula. For instance, let's assume the diameter of the steel round bar measures 2 inches. By substituting this value into the formula: I = (π/4) * (2 inches)^4 = (π/4) * 16 inches^4 = 4π inches^4. Therefore, the moment of inertia for the steel round bar with a diameter of 2 inches equals 4π inches^4. It is imperative to recognize that this formula assumes a solid cylindrical shape devoid of any alterations in diameter or hollow sections. If the round bar presents variations in diameter or is hollow, the moment of inertia calculation becomes more intricate and necessitates additional considerations.

Q: What is galvanized round bar?: Galvanized round bar generally refers to the wiring used for lightning protection in construction and installation. It is made of ordinary round steel (usually 8mm to 12mm diameter) and protected by electro galvanized protection layer. Galvanizing, differentiation, plating and electroplating, cold galvanizing and hot galvanizing etc..

Q: How do steel round bars compare to aluminum or steel tubing?: Steel round bars, aluminum tubing, and steel tubing all have their own unique properties and applications, so it is important to understand the characteristics of each material before making a comparison. Steel round bars are solid cylindrical bars made of steel. They are known for their high strength and durability, making them suitable for heavy-duty applications. Steel round bars have excellent tensile strength and can withstand high levels of stress and pressure. They are often used in construction, manufacturing, and engineering projects where strength and structural integrity are crucial. Steel round bars are also highly resistant to corrosion, making them suitable for outdoor and marine applications. Aluminum tubing, on the other hand, is made from aluminum, which is a lightweight and corrosion-resistant material. Aluminum tubing is known for its excellent thermal conductivity and electrical conductivity. It is often used in applications where weight reduction is important, such as in the aerospace and automotive industries. Aluminum tubing is also commonly used in the construction of heat exchangers and in electrical wiring systems due to its conductivity properties. Steel tubing, similar to steel round bars, is made of steel but is hollow in shape. Steel tubing is known for its versatility and wide range of applications. It is available in various shapes and sizes, including round, square, and rectangular, allowing for different structural designs. Steel tubing is often used in construction, automotive manufacturing, and industrial applications. It offers high strength and rigidity, making it suitable for applications that require structural support or the ability to withstand heavy loads. In comparison, steel round bars offer superior strength and durability compared to aluminum and steel tubing. They are ideal for heavy-duty applications that require high levels of strength and structural integrity. However, steel round bars can be heavier and more expensive than aluminum tubing, which is often preferred for lightweight applications. Steel tubing, on the other hand, provides versatility in terms of shape and size, allowing for more design options. Ultimately, the choice between steel round bars, aluminum tubing, and steel tubing depends on the specific requirements of the application, including factors such as strength, weight, cost, and corrosion resistance. It is important to carefully evaluate these factors and consult with experts to determine the most suitable material for a particular project.

Q: What are the different types of steel used to make round bars?: The production of round bars involves the utilization of various types of steel. The selection of steel depends on the desired characteristics and applications of the round bars. Carbon steel is a commonly utilized steel for round bars due to its remarkable strength and durability. It finds extensive use in construction, machinery, and automotive components, where a sturdy and inflexible material is required. Stainless steel is another type of steel employed for round bars. It is renowned for its ability to resist corrosion and withstand high temperatures. Applications that necessitate resistance to moisture, chemicals, and heat, such as food processing equipment, medical devices, and architectural structures, often employ stainless steel. Alloy steel, which is formed by combining iron with other elements like manganese, chromium, and nickel, is also used for round bars. This blending enhances its properties, resulting in improved strength, hardness, and resistance to wear and tear. Aerospace components, automotive parts, and machinery often employ alloy steel round bars due to their high strength and toughness. Tool steel, designed specifically for the production of tools and dies, is another type of steel used for round bars. It is renowned for its high hardness, wear resistance, and ability to maintain a sharp cutting edge. Tool steel round bars are commonly employed in applications involving cutting, shaping, and forming, such as drills, punches, and molds. In conclusion, the choice of steel for round bars is determined by specific application requirements, including factors such as strength, corrosion resistance, heat resistance, and wear resistance.

Q: What are the different cutting methods for steel round bars?: Depending on the specific requirements and available equipment, there are various cutting methods that can be used for steel round bars. Here are some of the most commonly used ones: 1. Sawing: Sawing is a traditional and basic method of cutting steel round bars. It involves using a saw blade with teeth to cut through the metal. This can be done manually with a hacksaw or with the assistance of a bandsaw or circular saw. Sawing is a versatile method suitable for both small and large-scale cutting projects. 2. Shearing: Another commonly used method is shearing. It utilizes a shear machine or hydraulic press to apply high force and cut through the metal. Shearing is particularly effective for cutting thick or heavy-duty steel bars. 3. Abrasive cutting: For steel round bars with irregular shapes or precision cutting projects, abrasive cutting is often employed. This method involves using an abrasive wheel or disc to grind away the metal and create the desired cut. It can be performed manually with a handheld grinder or with the assistance of an abrasive cut-off saw. 4. Flame cutting: Also known as oxy-fuel cutting, flame cutting employs a combination of oxygen and a fuel gas to create a high-temperature flame that melts and cuts through the steel. This method is commonly used for cutting thick steel bars or shaping metal. 5. Plasma cutting: Plasma cutting is an advanced method that utilizes a plasma torch to cut through the steel. The torch generates a high-velocity jet of ionized gas, which melts and removes the metal. Plasma cutting is often preferred for precision cutting due to its greater control and ability to produce cleaner cuts compared to other methods. It is important to consider factors such as the thickness and hardness of the steel round bar, desired precision of the cut, and available equipment when selecting a cutting method. Consulting with a professional or experienced metalworker is recommended to determine the most suitable method for a specific project.

Q: What are the different types of steel round bar shapes?: There is a wide range of steel round bar shapes to choose from, each possessing its own distinctive characteristics and uses. Some commonly seen types include: 1. Round: This shape is the most commonly used and versatile for steel round bars. It takes on a cylindrical form and finds application in various industries like construction, manufacturing, and automotive. 2. Square: Square steel round bars feature four equal sides and are often employed when a robust and sturdy form is needed. They are frequently utilized in construction, architectural designs, and machinery. 3. Hexagonal: Hexagonal steel round bars boast six sides, setting them apart with their unique shape. They are often selected for applications requiring high strength and corrosion resistance, such as aerospace, defense, and oil and gas industries. 4. Flat: Flat steel round bars exhibit a rectangular cross-section with flat top and bottom surfaces. They are commonly used when a broad, level surface is desired, as in construction, machinery, and manufacturing sectors. 5. Half Round: Half-round steel round bars adopt a semicircular shape with a flat base. They are frequently employed for handrails, fencing, and decorative purposes. 6. D-shaped: D-shaped steel round bars possess a flat bottom surface and a curved top surface, resembling the letter "D". They are often favored when a sturdy yet lightweight structure is required, such as in automotive frames and chassis. These examples merely scratch the surface of the various steel round bar shapes available. The choice of shape hinges upon the specific requirements of the application, encompassing factors like strength, durability, corrosion resistance, and aesthetic appeal.

Q: What is the maximum phosphorus content allowed for steel round bars?: The allowed phosphorus content in steel round bars is determined by the specific steel grade and industry standards, which can vary. Generally, the phosphorus content in steel round bars is typically limited to a maximum range of 0.04% to 0.05%. This limitation is necessary to maintain the desired mechanical properties, including strength, toughness, and ductility, of the steel product. Exceeding this phosphorus content can have negative consequences, such as reduced weldability, increased brittleness, and decreased corrosion resistance. To ensure the quality and performance of steel round bars in different applications, manufacturers and regulatory bodies establish stringent limits on phosphorus content. It is essential to refer to the relevant industry standards or specifications to determine the specific maximum phosphorus content permitted for a particular steel grade or application.

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