Good Quality Round Steel

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Specifications

1.EF+EAF+LF+VD+ESR
2.Competitive price
3.ISO&IQNet certificate
4.Excellent hardenability
5.P/S lessthan 0.020

Cold Work Tool Steel 1.2379, Alloy Steel Round Bars 1.2379, Din 1.2379 Steel Rod

Chemical composition 1.2379 round bar

Equivalent grades
GB	DIN	AISI	JIS	BS
Cr12Mo1V1	1.2379	D2	SKD11	BD2

Chemical composition
C	Si	Mn	Cr	P	S	V	Mo
1.50-1.60	0.10-0.40	0.15-0.45	11.50-12.50	0.03MAX	0.03MAX	0.90-1.10	0.60-0.80

Specification

Round bar	Diameter (mm)	Length (mm)
Round bar	50~500	2000~5800
plate/sheet	Thickness (mm)	Width (mm)	Length (mm)
plate/sheet	20~400	80~1000	2000~5800

Steel Surface

Steel Sharp	Surface treatment
Round bar	Black/Grinding/Polished/Peeled/Turned
steel plate	Black/Milling/Machined

Characteristic 1.2379

1.High hot strength and hardness.

2.Good toughness and abrasion resistance.

3.Heat treatment deformation small

Finished goods condition: 1.2379 hot forging/hot rolling + annealing/normalizing +

tempering/quenching + tempering/any conditions based on the customer's requirement

Surface conditions: rough machining/fine machining/based on the customer's requirement

Ultrasonic inspection: 100% UT acco to En1921D/d or based on the customer's requirement

Q:How do you prevent warping of steel round bars during machining?: To prevent warping of steel round bars during machining, several precautions can be taken. First, it is important to use a proper cutting tool with sharp edges and the right cutting speed to minimize heat generation. Additionally, using lubricants and coolants during the machining process can help dissipate heat and reduce friction. It is also crucial to ensure that the workpiece is properly secured to minimize vibration and movement during machining. Finally, allowing sufficient time for the steel round bars to cool down gradually after machining can help prevent warping.

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:Are steel round bars available in custom sizes?: Yes, steel round bars are available in custom sizes.

Q:How are steel round bars used in the construction of tunnels and underground structures?: Steel round bars are commonly used in the construction of tunnels and underground structures as reinforcement for concrete. These bars are placed within the concrete to provide strength and stability, preventing the structure from cracking or collapsing under pressure. The steel round bars also enhance the overall durability and load-bearing capacity of the tunnel or underground structure, ensuring its long-term structural integrity.

Q:What are the tolerance standards for steel round bars?: The tolerance standards for steel round bars vary depending on the specific requirements and industry standards. Generally, the tolerance for diameter or size of steel round bars is specified in terms of a plus or minus tolerance. This means that the actual diameter of the bar can deviate slightly from the specified size, but it should fall within the specified tolerance range. In some industries, such as construction or manufacturing, the tolerance for steel round bars may be relatively broad to allow for easier fabrication and installation. For example, a common tolerance range for the diameter of steel round bars used in construction could be ±0.005 to ±0.010 inches. In more precise applications, such as aerospace or automotive industries, the tolerance requirements for steel round bars are typically much tighter. In these cases, the tolerance range can be significantly smaller, often in the range of ±0.001 to ±0.002 inches. It is important to note that different countries and organizations may have their own specific tolerance standards for steel round bars. These standards are usually outlined in industry-specific documents or specifications, such as ASTM (American Society for Testing and Materials) or ISO (International Organization for Standardization) standards. In summary, the tolerance standards for steel round bars depend on the specific requirements of the industry and application. The tolerance range for diameter can vary from relatively broad to extremely tight, and these standards are typically defined by industry-specific organizations or standards bodies.

Q:Can steel round bars be used in the manufacturing of automotive parts?: Yes, steel round bars can indeed be used in the manufacturing of automotive parts. Steel round bars offer several advantages that make them suitable for this purpose. Firstly, steel is a strong and durable material, making it ideal for automotive components that require high strength and structural integrity. Additionally, steel round bars can be easily machined and formed into various shapes and sizes, allowing for the production of customized automotive parts. Moreover, steel has excellent heat resistance and can withstand high temperatures, making it suitable for engine components and other parts exposed to extreme heat. Lastly, steel is a cost-effective material, making it a popular choice in the automotive industry. Overall, steel round bars are a reliable and versatile option for the manufacturing of automotive parts.

Q:How strong are steel round bars compared to other materials?: Steel round bars are known for their exceptional strength and durability, making them one of the strongest materials available. Compared to other materials such as aluminum, brass, and wood, steel round bars have a significantly higher tensile strength, which refers to the amount of pulling force a material can withstand without breaking. Steel round bars can also handle higher compressive loads, making them ideal for applications where heavy loads or pressure is involved. In addition to their high strength, steel round bars also exhibit excellent ductility, which means they can be easily shaped or bent without breaking. This characteristic makes steel round bars versatile and widely used in various industries such as construction, automotive, manufacturing, and aerospace. While other materials may have their own unique properties and applications, steel round bars remain a top choice when it comes to strength and reliability. Their ability to withstand high loads, resist deformation, and maintain structural integrity make them a popular choice for structural components, shafts, axles, and many other demanding applications.

Q:Are steel round bars suitable for structural applications?: Yes, steel round bars are suitable for structural applications. Steel round bars are known for their high strength and durability, making them ideal for use in various structural applications. They provide excellent load-bearing capacity and are commonly used in construction projects such as bridges, buildings, and infrastructure. Additionally, steel round bars offer good resistance to corrosion, fire, and extreme weather conditions, ensuring the structural integrity and longevity of the application. Their versatility allows them to be easily shaped, welded, and modified to meet the specific requirements of the project. Overall, steel round bars are a reliable and cost-effective choice for structural applications.

Q:What are the common finishes for steel round bars?: Steel round bars can be finished in several ways, each offering unique properties and aesthetic appeal. Some of the most common finishes are as follows: 1. Achieving a rough and scaled surface, hot rolling involves rolling the steel at a high temperature. This finish is commonly preferred for applications where a rough texture is desired, such as structural components or machinery. 2. Cold rolling, on the other hand, results in a smoother and more polished surface. It is achieved by rolling the steel at room temperature and is often used in industries like automotive or aerospace, where a clean and precise appearance is required. 3. For a smooth and polished surface, the steel round bar can be turned and polished. This finish involves machining the bar and is commonly used for decorative purposes or in applications where precision is crucial, such as shafts or fasteners. 4. By grinding the steel round bar, any surface imperfections or irregularities can be removed, resulting in a smooth and uniform finish. This finish, known as grinding, is suitable for applications where tight tolerances or a consistent finish are essential. 5. Alternatively, steel round bars can be coated or plated with different materials to enhance their corrosion resistance or aesthetic appeal. Popular options include galvanizing, which involves applying a layer of zinc to protect against rust, or chrome plating, which provides a shiny and attractive finish. Ultimately, the choice of finish for a steel round bar depends on the specific requirements of the application, such as the desired appearance, corrosion resistance, or mechanical properties needed.

Q:How do you calculate the deflection of a steel round bar?: To calculate the deflection of a steel round bar, you can use the Euler-Bernoulli beam theory formula, which states that the deflection is proportional to the applied load, the length of the bar, and the fourth power of its diameter. By inputting these values into the formula, you can determine the deflection of the steel round bar.

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