Carbon Alloy Steel Round Bars AISI 4140 System 1

Carbon Alloy Steel Round Bars AISI 4140 System 2

Carbon Alloy Steel Round Bars AISI 4140 System 3

Carbon Alloy Steel Round Bars AISI 4140 System 4

Carbon Alloy Steel Round Bars AISI 4140

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Loading Port:: China main port

Payment Terms:: TT OR LC

Min Order Qty:: 30 m.t.

Supply Capability:: 10000 m.t./month

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Chemical Composition	Mechanical Properties (In Quenched & Tempered State)
C	0.38-0.43 %	Tensile strength(MPA)	≥1080(110)
Si	0.15-0.35%	Yield strength (MPA)	≥930(95)
Mn	0.75-1.00 %	Elongation (δ5/%)	≥12
Cr	0.80-1.10 %	Reduction in Area (ψ/%)	≥45
Ni	≤0.030 %	Impact (J)	≥ 63
P	≤0.030 %	Impact toughness value αkv (J/cm2)	≥78(8)
S	≤0.040 %	Hardness	≤217HB
Cu	≤0.030 %
Mo	0.15-0.25 %

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: How do you calculate the deflection of a steel round bar?: In order to determine the deflection of a steel round bar, several factors need to be taken into consideration, such as the length, diameter, and applied load of the bar. The deflection of the bar refers to its bending or flexing when subjected to a specific load. The deflection can be calculated using the formula derived from Euler-Bernoulli beam theory. The formula is as follows: δ = (F * L^3) / (48 * E * I) In this formula: - δ represents the deflection - F denotes the applied load - L indicates the length of the bar - E represents the modulus of elasticity of the steel material - I signifies the moment of inertia of the round bar To calculate the moment of inertia (I) for a round bar, you can utilize the following formula: I = (π * D^4) / 64 In this formula: - I represents the moment of inertia - D denotes the diameter of the round bar By substituting the respective values into the formula, the deflection of the steel round bar can be determined under the given load. It should be emphasized that these calculations assume the bar possesses perfect elasticity and adheres to the principles of linear elasticity.

Q: What are the different types of steel round bar surface defects?: Steel round bars can exhibit various types of surface defects. Among the most common defects are: 1. Scale: This defect arises from the formation of a thin layer of oxide on the steel's surface during manufacturing. It presents as a rough, flaky, or scaly texture and can be easily eliminated through pickling or abrasive cleaning. 2. Pitting: Localized corrosion manifests as small, shallow holes or depressions on the steel's surface. It is usually caused by exposure to corrosive substances or environments and can weaken the material if left unaddressed. 3. Surface cracks: These visible cracks appear on the surface of the steel round bar and can be attributed to factors like improper cooling during manufacturing, excessive stress, or mishandling. Surface cracks can compromise the steel's structural integrity and necessitate careful inspection and repair. 4. Decarburization: This defect occurs when the steel's surface layer loses carbon content, resulting in reduced hardness and strength. High temperatures during heat treatment or inadequate cooling methods often cause decarburization. It can be identified through visual inspection or hardness tests. 5. Lamination: Lamination defects arise when layers or flakes are present within the steel round bar. These layers can weaken the material and compromise its structural integrity. Improper rolling or excessive impurities in the steel are typically responsible for lamination defects. 6. Inclusions: During the manufacturing process, foreign materials or impurities can become trapped within the steel, resulting in inclusions. These can appear as dark spots, streaks, or irregular shapes on the round bar's surface. Inclusions reduce the steel's strength and ductility and can be caused by factors such as poor raw material quality or insufficient refining processes. It is crucial to note that the severity and impact of surface defects on steel round bars can vary. Regular inspection and quality control measures are essential for identifying and rectifying any surface defects, ensuring the reliability and integrity of the steel round bar.

Q: Can steel round bars be used for making handrails?: Yes, steel round bars can be used for making handrails. Steel round bars are commonly used in construction and fabrication due to their strength and durability. They can be easily shaped and welded to create handrails that provide support and safety for staircases, balconies, and other elevated areas. Additionally, steel round bars can be finished with various coatings or treatments to enhance their corrosion resistance and aesthetics. Overall, steel round bars are a popular choice for making handrails due to their strength, versatility, and ability to withstand heavy usage.

Q: What are the different finishes available for steel round bars?: Steel round bars are available in several finishes, each serving a specific purpose and offering distinct benefits. Some commonly used finishes include: 1. Hot Rolled: By heating the steel above its recrystallization temperature and rapidly cooling it, a rough and scaly surface texture is achieved. This finish provides excellent corrosion resistance and durability. 2. Cold Rolled: The steel is rolled at room temperature, resulting in a smooth and polished finish. Cold rolled steel round bars are known for their precise dimensions, tight tolerances, and improved surface finish. 3. Bright Drawn: This finish involves subjecting the steel round bars to a drawing process, where they are pulled through a die to achieve the desired shape and size. It leaves the surface smooth, bright, and free from imperfections. 4. Polished: Polishing is typically done after cold rolling or drawing the steel round bars. Abrasive materials or chemical treatments are used to remove surface imperfections and create a highly reflective finish. Polished steel round bars are commonly used for decorative purposes. 5. Ground: Grinding is a process where abrasive wheels are used to remove surface imperfections or irregularities from the steel round bars. This results in a smooth and even finish, making the bars suitable for applications requiring tight tolerances and uniformity. 6. Galvanized: Galvanizing involves dipping the steel round bars in a bath of molten zinc, creating a protective layer that prevents corrosion and increases their lifespan. This finish is ideal for outdoor applications or environments with high humidity or moisture. These various finishes offer different properties and appearances, allowing steel round bars to be used in industries such as construction, automotive, manufacturing, and engineering. It is important to consider the specific requirements and conditions of the intended use when selecting the appropriate finish for steel round bars.

Q: Can steel round bars be used for making wheel hubs?: Indeed, wheel hubs can be crafted using steel round bars. The preference for steel round bars in the fabrication of wheel hubs is attributed to their robustness and longevity. The cylindrical form of these bars facilitates effortless machining and shaping to meet the desired wheel hub design. Steel is renowned for its remarkable tensile strength and ability to withstand deterioration, making it an optimal substance for wheel hubs that must endure substantial loads and incessant wheel rotation. Moreover, steel is easily accessible and comparatively economical in contrast to alternative materials, rendering it a favored selection in the automotive sector for wheel hub manufacturing.

Q: How do you measure the diameter of a steel round bar?: In order to determine the diameter of a steel round bar, there are two tools that can be utilized: a caliper or a micrometer. First and foremost, it is crucial to ensure that the round bar is devoid of any dirt, debris, or rough edges. Place the round bar on a level and smooth surface. If a caliper is available, open it and place one jaw on one side of the round bar and the other jaw on the opposite side. It is important to guarantee that the jaws are perpendicular to the bar and in contact with its outer surface. Gradually close the caliper until both jaws are firmly pressed against the bar. The measurement can be read from the caliper's scale or digital display, providing the diameter of the round bar. Alternatively, if a micrometer is at hand, open it and adjust the thimble to zero. Position the anvil, which is the stationary part, against one side of the round bar, and the spindle, which is the moving part, against the opposite side. Rotate the thimble until the spindle makes firm contact with the bar. The measurement can be read from the thimble's scale or digital display, along with the corresponding number on the barrel. This will yield the diameter of the round bar. It is important to remember that in order to ensure accuracy, multiple measurements should be taken at various points along the bar, as the diameter may not be perfectly uniform throughout its length.

Q: What are the advantages of using heat-treatable steel round bars?: There are several advantages to using heat-treatable steel round bars. Firstly, heat treatment allows for increased strength and hardness, making the bars suitable for applications that require high durability and load-bearing capacity. Secondly, heat-treatable steel round bars can be easily machined and fabricated into various shapes and sizes, providing flexibility in design and manufacturing processes. Additionally, heat treatment enhances the bars' resistance to wear, corrosion, and fatigue, increasing their lifespan and reducing maintenance costs. Lastly, the ability to customize the heat treatment process enables the bars to meet specific performance requirements, making them a preferred choice in industries such as automotive, aerospace, and construction.

Q: What are the different types of steel round bar surface treatments?: Steel round bars can undergo various surface treatments to enhance their appearance, durability, and resistance to corrosion. Some commonly used treatments are: 1. Hot-dip galvanizing: Immerse the steel round bar in molten zinc to create a protective zinc coating, preventing rust and corrosion. Ideal for outdoor applications. 2. Electroplating: Apply a layer of another metal, like chrome or nickel, to the steel round bar. Improves appearance and corrosion resistance. 3. Powder coating: Electrostatically apply a dry powder to the surface, then cure it under heat. Creates a hard, durable, and attractive finish resistant to chipping, scratching, and fading. 4. Passivation: Chemically remove impurities from the surface, leaving a clean and corrosion-resistant layer. Commonly used for enhancing rust resistance in stainless steel bars. 5. Black oxide coating: Form a thin layer of black iron oxide on the surface. Provides mild corrosion resistance and a sleek black appearance. 6. Shot blasting: Propel abrasive materials at high speeds onto the surface to remove impurities or scale. Improves appearance and promotes better coating adhesion. 7. Acid pickling: Immerse the bar in an acid bath to remove scale and impurities, leaving a clean surface free from contaminants. These treatments are just a few examples of what can be done to steel round bars. The choice depends on factors such as the bar's intended use, desired appearance, and required corrosion resistance level.

Q: Can steel round bars be used in the manufacturing of machinery?: Yes, steel round bars can definitely be used in the manufacturing of machinery. Steel round bars are widely used in various industries for their strength, durability, and versatility. They are commonly used to create components such as shafts, axles, gears, and other mechanical parts that require high strength and resistance to wear and tear. Steel round bars offer excellent mechanical properties, including high tensile strength and good machinability, which make them suitable for use in heavy machinery and equipment. Additionally, steel round bars can be easily welded, forged, or machined into the desired shape, making them a preferred choice for manufacturing machinery.

Q: How are steel round bars tested for quality and compliance?: To ensure quality and compliance, steel round bars undergo a series of rigorous tests and inspections. The most commonly used test is the tensile test, which measures the bar's ability to withstand pulling forces. By stretching the bar until it breaks and analyzing the stress-strain curve, its mechanical properties, including yield strength, ultimate tensile strength, and elongation, can be determined. Another important test is the hardness test, which assesses the bar's surface resistance to indentation. This test helps determine the material's strength and its ability to resist wear and deformation. Chemical analysis is conducted to verify the composition of the steel round bars. This test determines the percentage of elements present, such as carbon, manganese, silicon, sulfur, and phosphorus. It ensures that the steel meets the required specifications and is suitable for its intended application. Dimensional inspection is crucial to ensure that the steel round bars meet the specified dimensions and tolerances. This involves using calibrated instruments to measure the length, diameter, and straightness of the bars. The surface quality is assessed through visual inspection and non-destructive testing methods, such as ultrasonic testing and magnetic particle inspection. These tests detect any surface defects, cracks, or discontinuities that may affect the bar's performance and integrity. Additionally, specialized tests may be conducted based on the intended application of the steel round bars. For example, bars used in the construction industry may undergo corrosion resistance or impact testing. In summary, the quality and compliance of steel round bars are assured through a comprehensive range of tests, inspections, and analyses. These tests enable manufacturers and customers to determine the suitability and reliability of the bars for specific applications, ensuring the safety and effectiveness of the final products.

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