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Plain Bar

Plain Bar

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Specifications of High Quality Round Bar

1. Grade: GB, JIS, ASTM, EN

2. Grade: Q235, SS400, A36, S235JR

3. Diameter and mass: As below

Diameter

Mass

Diameter

Mass

Diameter

Mass

(mm)

(kg/m)

(mm)

(kg/m)

(mm)

(kg/m)

6

0.22

22

2.98

53

17.30

7

0.30

24

3.55

56

19.30

8

0.40

25

3.85

60

22.20

9

0.50

26

4.17

63

24.50

10

0.62

28

4.83

65

26.00

11

0.75

30

5.55

70

30.20

12

0.89

32

6.31

75

34.70

13

1.04

34

7.13

80

39.50

14

1.21

36

7.99

85

44.50

15

1.39

38

8.90

90

49.90

16

1.58

40

9.86

95

55.60

17

1.78

42

10.90

100

61.70

18

2.00

45

12.50

120

88.85

19

2.23

48

14.20

140

120.93

20

2.47

50

15.40

150

138.82

4. Material: Mild Steel

5. Heat treatment of high quality steel:

Fire: Isothermal annealing temperature is 800 ~ 880 °C, with 10 ~ 20 °C, the furnace cooling to about 600 °C, hardness above HB269.

Preheat temperature: 730-730 °C

Quenching temperature: 1190-1210 °C

Tempering temperature: 540-595 °C

Cold drawn, hardness 285 HBS

Cold drawn after annealing condition, hardness 277 HBS

Quenching methods: oil quenching, air cooling or salt bath quenching

Usage and Applications of High Quality Round Bar

1) Suitable for making various strong cutting tool abrasion resistance, impact resistance.

2) Used to produce all kinds of high hard and super hard saw blade, drill, tap, broach, gear hob and various kinds of milling cutter.

3) Used for advanced punching die, screw die, and the toughness and complicated shape of the punch, etc.

4) Is used for cold forging die and drawing mode, etc.

5) Recommended watchcase factory, screw factory and other cold stamping products industry use.

Packaging & Delivery of High Quality Round Bar

Packaging Detail: All goods are packed in bundle with steel strips and shipped by break bulk vessel or container (depend on target market and different ports)

Delivery Detail: 45 days

Trade terms: FOB, CFR, CIF

MOQ: 25 tons per specification; we can negotiate the quantity if the specification is normal or we have stock of one specification.

Weight: The price invoicing on theoretical weight basis or actual weight basis depends on customer’s request.

Shipment: The shipment of bulk break or container is depends on customer’s request and the situation of the port of destination.

Documents given: Full set of original clean on board bill of lading; Original signed commercial invoice; Original packing list; Policy of insurance; Certificate of origin and what the target market needs.

Production Flow of High Quality Round Bar

The common processes are preheated forging quenching, dual refinement solution process, cooling quenching and isothermal quenching. We use heat treatment for dual refinement solution process. The main measures process is high temperature solution and refinement cycle. High temperature solution can improve the carbide morphology and particle size. The aim is to make the loop refinement ultrafine austenite grains.


Q:What are the different types of tests performed on steel round bars for quality control?
There are several types of tests performed on steel round bars for quality control purposes. These tests help to ensure that the steel bars meet the required standards and specifications. Some of the common tests conducted on steel round bars include: 1. Tensile Test: This test evaluates the tensile strength, yield strength, and elongation properties of the steel bars. It involves applying a pulling force to the bar until it breaks, measuring the maximum force the bar can withstand, and determining the bar's ability to stretch without fracturing. 2. Hardness Test: The hardness test measures the resistance of the steel bar to indentation or scratching. It provides an indication of the bar's strength and durability. Common hardness tests include Rockwell, Brinell, and Vickers tests. 3. Chemical Composition Analysis: This test determines the chemical composition of the steel round bars, including the percentage of various elements such as carbon, manganese, sulfur, phosphorus, and others. It ensures that the bars meet the specified chemical composition requirements. 4. Ultrasonic Testing: Ultrasonic testing uses high-frequency sound waves to detect any internal defects or discontinuities within the steel bars. This non-destructive test helps identify cracks, voids, or other defects that may affect the bar's structural integrity. 5. Dimensional Inspection: This test ensures that the steel round bars meet the required dimensional tolerances, including diameter, length, and straightness. It involves using precision measuring instruments such as calipers, micrometers, and gauges to verify the bar's dimensions. 6. Surface Quality Examination: This test inspects the surface condition of the steel bars for any defects, such as cracks, pits, scratches, or other surface irregularities. It is crucial to ensure that the bars have a smooth and defect-free surface for proper functionality and safety. 7. Microstructure Analysis: Microstructure analysis involves examining the steel bar's internal structure under a microscope. It helps determine the grain size, inclusion content, and overall microstructural integrity of the bars. This analysis provides insights into the bars' mechanical properties and their ability to withstand various loads and stresses. By performing these tests, manufacturers can ensure that the steel round bars meet the required quality standards and are suitable for their intended applications.
Q:What is the difference between a cold-drawn and a polished steel round bar?
The manufacturing processes and resulting properties of a cold-drawn steel round bar and a polished steel round bar are different. To produce a cold-drawn steel round bar, a hot-rolled steel bar is pulled or drawn through a die or series of dies at room temperature. This reduces its diameter and increases its length. This process imparts specific characteristics to the steel. Cold-drawn steel bars have a smooth and shiny surface, with tight dimensional tolerances and improved mechanical properties. The cold drawing process refines the microstructure of the steel, making it stronger, more uniform, and less prone to defects. These bars are commonly used in applications that require high strength, precision, and resistance to fatigue, such as automotive components, machinery, and tooling. In contrast, a polished steel round bar undergoes a different treatment process. Once the steel bar is formed, it undergoes polishing, which involves grinding or buffing the surface to achieve a smooth and reflective finish. Polished steel bars have a shiny and mirror-like appearance due to the removal of surface imperfections and contaminants. This process is primarily done for aesthetic purposes and does not significantly alter the mechanical properties of the steel. Polished steel round bars are commonly used in decorative applications, architectural designs, and furniture. In conclusion, the main distinction between a cold-drawn and a polished steel round bar lies in their manufacturing processes and intended applications. Cold-drawn bars go through a precise cold drawing process to enhance their mechanical properties, while polished bars undergo surface polishing for an aesthetically pleasing finish.
Q:What is the difference between a rough turned and a seamless steel round bar?
A rough turned steel round bar refers to a metal bar that has undergone a preliminary turning process, where excess material is removed to achieve a rougher surface finish. This process helps to create a more uniform diameter and removes any surface imperfections or irregularities. Rough turned bars are commonly used in applications where a smooth surface finish is not a requirement, such as in manufacturing machinery or agricultural equipment. On the other hand, a seamless steel round bar is a solid metal bar that is formed without any welding or seams. It is manufactured through a process called piercing, where a solid billet is heated and then pierced with a mandrel to create a hollow tube. The tube is then elongated and reduced in diameter through a series of rolling and drawing processes until it reaches the desired dimensions. Seamless round bars are known for their superior strength and resistance to corrosion, making them suitable for applications where a high level of performance is required, such as in the oil and gas industry or automotive manufacturing. In summary, the main difference between a rough turned and a seamless steel round bar lies in their manufacturing processes and surface finishes. Rough turned bars are created by removing excess material to achieve a rougher surface finish, while seamless bars are formed without any welding or seams, resulting in a smooth and continuous surface.
Q:How about the difference between round steel and shaped steel? Where are they mainly used?
Low carbon steel structure steel Q235, Q345 rolled out section is I-shaped, C shape, L shape, flat strip, plate shape... Etc.... Called into "type", as used in steel structure component.
Q:Can steel round bars be cut to custom lengths?
Indeed, it is possible to cut steel round bars to tailor-made lengths. These bars made of steel are adaptable and can be effortlessly cut using different techniques like sawing, shearing, or torch cutting. These approaches enable accurate adjustments to be made to meet specific demands or project necessities. Moreover, steel round bars are often obtainable in standard lengths, but they can be conveniently shortened or elongated by welding separate pieces together. All in all, steel round bars provide versatility in terms of length customization, rendering them suitable for a diverse array of applications.
Q:What are the cost considerations for steel round bars?
The cost considerations for steel round bars typically include factors such as the grade and quality of steel used, the diameter and length of the bar, the quantity being purchased, and the current market conditions. Additionally, any additional processing, such as cutting or heat treatment, may also affect the overall cost.
Q:What are the advantages of using nickel-molybdenum-vanadium alloy steel round bars?
There are several advantages of using nickel-molybdenum-vanadium alloy steel round bars, including: 1. High strength and durability: Nickel-molybdenum-vanadium alloy steel round bars offer excellent strength and durability, making them suitable for applications that require a high level of structural integrity. This alloy steel is known for its ability to withstand heavy loads and resist deformation, making it ideal for use in industries such as construction, automotive, and aerospace. 2. Corrosion resistance: Another advantage of using nickel-molybdenum-vanadium alloy steel round bars is their excellent resistance to corrosion. The addition of nickel and vanadium to the alloy enhances its ability to resist oxidation and corrosion, even in harsh environmental conditions. This makes it a preferred choice for applications where exposure to moisture, chemicals, or corrosive substances is expected. 3. Heat resistance: Nickel-molybdenum-vanadium alloy steel round bars have a high heat resistance, making them suitable for applications that involve high temperatures. The presence of molybdenum in the alloy increases its resistance to thermal stress, ensuring that it remains structurally stable even at elevated temperatures. This makes it ideal for use in industries such as oil and gas, power generation, and heat exchangers. 4. Versatility: The versatility of nickel-molybdenum-vanadium alloy steel round bars is another advantage. This alloy can be easily forged, machined, and welded, allowing for a wide range of manufacturing processes. Its versatility makes it a preferred choice for applications that require complex shapes and designs, such as shafts, gears, and valves. 5. Cost-effective: Despite its numerous advantages, nickel-molybdenum-vanadium alloy steel round bars are relatively cost-effective compared to other high-performance alloys. Its excellent combination of properties makes it a cost-efficient option for various industries, as it offers a longer lifespan, reduced maintenance requirements, and improved performance, ultimately resulting in cost savings over time. In conclusion, the advantages of using nickel-molybdenum-vanadium alloy steel round bars include high strength and durability, corrosion resistance, heat resistance, versatility, and cost-effectiveness. These properties make it a preferred choice for a wide range of applications in various industries.
Q:Are steel round bars prone to deformation?
Steel round bars are generally not prone to deformation when they are properly manufactured and used within their intended limits. Steel is known for its high tensile strength and durability, making it resistant to bending or warping under normal circumstances. However, it is important to note that excessive force or improper handling can still cause deformation in steel round bars. Overloading, incorrect storage conditions, or inappropriate machining techniques can all contribute to bending or twisting of the bars. Therefore, it is crucial to follow recommended guidelines and industry standards to ensure the integrity and longevity of steel round bars.
Q:What are the advantages of using corrosion-resistant steel round bars?
There are several advantages of using corrosion-resistant steel round bars. Firstly, these bars are highly resistant to corrosion, which means they can withstand exposure to moisture, chemicals, and other corrosive elements without undergoing significant damage. This makes them ideal for use in environments where there is a high risk of corrosion, such as coastal areas or industrial settings. Secondly, corrosion-resistant steel round bars have a longer lifespan compared to regular steel bars. The ability to resist corrosion ensures that these bars maintain their structural integrity and strength over time, reducing the need for frequent replacements. This not only saves costs but also minimizes the downtime associated with maintenance and repairs. Furthermore, the use of corrosion-resistant steel round bars enhances safety. When steel bars corrode, they can weaken and eventually fail, posing a risk to buildings, infrastructure, and even human lives. By using corrosion-resistant steel round bars, the risk of structural failures due to corrosion is significantly reduced, ensuring the safety of people and property. Additionally, corrosion-resistant steel round bars offer versatility in design and application. These bars can be easily fabricated and shaped into various configurations, making them suitable for a wide range of construction projects. They can be used in the construction of bridges, buildings, marine structures, pipelines, and many other applications where corrosion resistance is vital. Lastly, corrosion-resistant steel round bars contribute to environmental sustainability. The longer lifespan of these bars reduces the need for frequent replacements, thereby decreasing the demand for raw materials and reducing waste. Moreover, their resistance to corrosion means less maintenance and repair work, resulting in lower energy consumption and fewer carbon emissions. In conclusion, the advantages of using corrosion-resistant steel round bars include their resistance to corrosion, extended lifespan, enhanced safety, versatility in design, and positive environmental impact. These qualities make them a cost-effective and reliable choice for various construction and infrastructure projects.
Q:What are the different types of steel round bar alloys for improved wear resistance?
There are several different types of steel round bar alloys that are specifically designed to improve wear resistance. These alloys are formulated to have enhanced hardness and toughness, making them suitable for applications where the material is subjected to constant friction or abrasive forces. One common alloy is tool steel, which includes variations such as H13, D2, and A2. Tool steel is known for its high hardness, excellent wear resistance, and good toughness. It is often used in applications such as molding and forming tools, cutting tools, and dies. Another alloy for improved wear resistance is stainless steel. Stainless steel round bars are corrosion-resistant and have good strength properties. They are commonly used in applications like food processing equipment, medical devices, and marine components. Abrasion-resistant steel, also known as AR steel, is another type of alloy used for improved wear resistance. AR steel is specially formulated to withstand impact and abrasion, making it ideal for applications such as mining equipment, construction machinery, and material handling systems. Manganese steel is another alloy that provides excellent wear resistance. It is commonly used in applications involving high impact and abrasive wear, such as crusher jaws, railroad crossings, and excavator buckets. Lastly, there are specialty alloys such as chrome-moly steel (chromium-molybdenum) and nickel-chromium alloys, which offer superior wear resistance in specific conditions. These alloys are often used in high-temperature applications, such as aerospace components, power generation equipment, and automotive parts. In summary, the different types of steel round bar alloys for improved wear resistance include tool steel, stainless steel, abrasion-resistant steel, manganese steel, and specialty alloys. Each alloy has its own unique properties and is suited for specific applications where wear resistance is a critical requirement.

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