High-Quality Round 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 is the maximum carbon content allowed for steel round bars?: The maximum carbon content allowed for steel round bars typically ranges from 0.25% to 0.30%.

Q: Can steel round bars be used in the energy industry?: Yes, steel round bars can be used in the energy industry. Steel round bars are commonly used in various applications within the energy industry due to their high strength, durability, and resistance to corrosion. They are used in the construction of power plants, oil rigs, pipelines, and other energy infrastructure projects. Steel round bars are also used in the manufacturing of machinery and equipment used in the energy industry, such as turbines, generators, and pumps. Additionally, steel round bars are often utilized in the production of renewable energy technologies, including wind turbines and solar power systems. Overall, steel round bars are a versatile and reliable material that can effectively meet the demanding requirements of the energy industry.

Q: How do you calculate the fatigue strength of a steel round bar?: The fatigue strength of a steel round bar can be calculated using various methods, such as the stress-life (S-N) curve approach or the strain-life (ε-N) curve approach. 1. Stress-Life (S-N) Curve Approach: This method involves plotting the stress amplitude (S) against the number of cycles to failure (N) on a log-log scale. The S-N curve is obtained by subjecting multiple specimens of the steel round bar to different stress levels and measuring the number of cycles to failure for each stress level. The fatigue strength of the steel round bar can be determined by identifying the stress level at which the desired number of cycles to failure is achieved, typically referred to as the endurance limit. 2. Strain-Life (ε-N) Curve Approach: This method involves plotting the strain amplitude (ε) against the number of cycles to failure (N) on a log-log scale. Similar to the S-N curve approach, multiple specimens of the steel round bar are subjected to different strain levels, and the number of cycles to failure is measured. The strain-life curve can then be used to determine the fatigue strength by identifying the strain level corresponding to the desired number of cycles to failure. It is important to note that calculating the fatigue strength of a steel round bar requires conducting fatigue tests on representative specimens under controlled conditions. These tests involve subjecting the specimens to cyclic loading, typically in the form of tension-compression cycles, and recording the number of cycles to failure. The obtained data is then used to construct the S-N curve or the ε-N curve, which provides valuable information about the fatigue behavior and strength of the steel round bar.

Q: What are the different types of surface defects that can occur in steel round bars?: There are several types of surface defects that can occur in steel round bars. Some of the most common defects include: 1. Scratches: These are shallow grooves or marks on the surface of the round bar caused by friction or contact with sharp objects during handling or transport. 2. Pitting: Pits are small, localized cavities or depressions on the surface of the round bar caused by corrosion or exposure to harsh environments. Pitting can lead to further corrosion if not addressed. 3. Scale: Scale refers to the thin layer of oxide or other impurities that can form on the surface of steel round bars during the manufacturing process. It can affect the appearance and quality of the bar but is often removed during subsequent processing or cleaning. 4. Scabs: Scabs are irregularly shaped protrusions or raised areas on the surface of the round bar caused by solidification or cooling issues during the casting process. They can reduce the strength and integrity of the bar if not properly addressed. 5. Roll marks: These are elongated depressions or ridges on the surface of the round bar caused by uneven or improper rolling during the manufacturing process. Roll marks can affect the dimensional accuracy of the bar and may require additional processing or grinding to remove. 6. Laminations: Laminations are internal defects that can sometimes be visible on the surface of the round bar. They are caused by improper bonding or separation of layers during the steelmaking process. Laminations can weaken the bar and reduce its load-bearing capacity. 7. Inclusions: Inclusions are non-metallic particles or impurities that can become trapped in the steel during the manufacturing process. They can appear as dark spots or irregularities on the surface of the round bar and may affect its mechanical properties. It is important to note that these surface defects can vary in severity and impact on the performance of the steel round bar. Manufacturers and quality control personnel employ various inspection techniques to identify and mitigate these defects to ensure the quality and reliability of the final product.

Q: How are steel round bars used in the automotive industry?: Steel round bars are commonly used in the automotive industry for a variety of applications due to their strength, durability, and versatility. One of the main uses of steel round bars in the automotive industry is for the production of crankshafts. Crankshafts play a crucial role in converting the reciprocating motion of the pistons into rotational motion, powering the vehicle. Steel round bars are ideal for this application as they offer high tensile strength, excellent fatigue resistance, and the ability to withstand high torque loads. Steel round bars are also used in the manufacturing of axles. Axles are responsible for transferring power from the engine to the wheels, supporting the weight of the vehicle, and providing stability. Steel round bars provide the necessary strength and rigidity required to handle the heavy loads and forces experienced by the axles. Additionally, steel round bars are utilized in the production of suspension components such as tie rods and sway bars. Tie rods are crucial for steering and maintaining proper alignment, while sway bars help to control body roll and improve handling. Steel round bars are preferred for these applications because they offer excellent torsional strength, allowing them to withstand the forces and stresses encountered during steering and suspension movements. Furthermore, steel round bars find use in the production of transmission shafts. Transmission shafts are responsible for transmitting power from the engine to the wheels via the gearbox. Steel round bars are well-suited for this application due to their high strength, resistance to bending, and ability to handle the rotational forces and torque generated by the engine. In summary, steel round bars are widely used in the automotive industry for various applications such as crankshafts, axles, suspension components, and transmission shafts. Their superior strength, durability, and versatility make them an ideal choice for these critical components, ensuring the safety, performance, and reliability of vehicles.

Q: How are steel round bars used in the construction of stadiums and sports facilities?: Steel round bars are widely used in the construction of stadiums and sports facilities due to their strength, durability, and versatility. These bars are typically made from carbon steel and are available in various diameters and lengths to meet the specific needs of each project. One of the primary uses of steel round bars in stadium construction is for the reinforcement of concrete structures. These bars are often embedded within concrete columns, beams, and slabs to enhance their load-bearing capacity and overall structural integrity. The high tensile strength of steel allows it to withstand heavy loads and provide the necessary support for large seating areas, roofs, and other architectural elements. Steel round bars are also used in the construction of stadium roofs and canopies. These structures require a strong and lightweight material that can span long distances without the need for excessive support columns. Steel bars, when properly designed and installed, offer an ideal solution by providing the necessary strength while minimizing the number of support elements, thus allowing for unobstructed views and spacious seating arrangements. Additionally, steel round bars are commonly used in the fabrication of stadium fences, guardrails, and handrails. These components are crucial for ensuring the safety and security of spectators, preventing falls or accidents in elevated areas, and guiding the flow of people within the facility. The high tensile strength of steel provides the necessary resistance against impact, making it an ideal material for these applications. In summary, steel round bars play a crucial role in the construction of stadiums and sports facilities. Their strength, durability, and versatility make them a preferred choice for reinforcing concrete structures, constructing roofs and canopies, and fabricating safety components. By utilizing steel round bars, stadiums can be built to withstand heavy loads, provide unobstructed views, and ensure the safety of spectators, ultimately enhancing the overall experience for sports enthusiasts.

Q: What are the different types of steel round bars used in the automotive braking systems?: Automotive braking systems rely on various types of steel round bars that possess specific properties for optimal performance. These steel variants are carefully selected for their strength, durability, and ability to withstand the intense temperatures and pressures that arise during braking. One commonly utilized steel round bar is carbon steel, renowned for its exceptional hardness and high strength. Brake rotors and drums often incorporate carbon steel round bars due to their ability to endure the heat and friction generated during braking, ensuring reliable and long-lasting performance. Stainless steel represents another steel round bar employed in automotive braking systems. Its resistance to corrosion and rust make it an ideal choice for brake lines and fittings. Additionally, stainless steel boasts excellent heat resistance properties, enabling it to endure the thermal stresses generated during braking. Furthermore, alloy steel round bars find application in automotive braking systems. Combining various metals like chromium, nickel, and molybdenum, alloy steel enhances its mechanical properties. Known for their remarkable tensile strength and toughness, alloy steel round bars suit demanding applications that require superior performance and durability. Specialized types of steel round bars also exist, designed specifically for particular applications within automotive braking systems. For instance, heat-treated steel round bars are employed in the manufacturing of brake calipers and pistons due to their capability to withstand the extreme temperatures resulting from the friction between brake pads and rotors. In summary, the selection of steel round bars in automotive braking systems hinges upon specific requirements, encompassing strength, durability, heat resistance, and corrosion resistance. By carefully choosing the appropriate steel variant, automotive manufacturers can guarantee the safety and reliability of their braking systems.

Q: What are the different types of surface treatments for steel round bars?: Steel round bars can be treated in several ways to enhance their properties and suit different applications. Some commonly used treatments for steel round bars include: 1. Zinc coating, also known as galvanization, provides excellent corrosion resistance. It is often used in outdoor and marine applications. 2. Black oxide coating chemically converts the surface of the steel round bars to a black iron oxide layer, offering enhanced corrosion resistance and an attractive black finish. This treatment is popular for decorative purposes. 3. Grinding is a surface treatment that involves using abrasive materials to remove the outer layer of the steel round bars. This process improves the surface finish, making them smoother and more visually appealing. 4. Shot blasting involves propelling small metallic or non-metallic particles at high velocity onto the surface of the steel round bars. It effectively removes impurities like mill scale and rust, resulting in a clean and uniform surface. 5. Chrome plating deposits a layer of chromium onto the surface of the steel round bars, providing excellent corrosion resistance and a polished, mirror-like finish. This treatment is commonly used when aesthetics and corrosion resistance are important. 6. Powder coating involves applying a dry powder electrostatically to the steel round bars, which is then cured under heat. This treatment creates a durable and visually appealing finish that is resistant to corrosion, chemicals, and UV rays. 7. Passivation is a chemical treatment that removes iron and other contaminants from the surface of the steel round bars. It leaves behind a clean and corrosion-resistant layer. Passivation is particularly important in industries such as medical and food, where cleanliness and corrosion resistance are crucial. These examples highlight the range of surface treatments available for steel round bars. The choice of treatment depends on specific requirements such as corrosion resistance, aesthetics, and durability.

Q: How can I connect channel steel and round steel?: First, the channel steel, channel cut, need to connect the length of the arc shaped gap, and then again and round steel arc surface welding, welding before the two kinds of materials to rust, and full welding.

Q: Are steel round bars suitable for the production of hydraulic cylinders?: Yes, steel round bars are suitable for the production of hydraulic cylinders. Steel is a material known for its strength, durability, and resistance to corrosion, making it an excellent choice for hydraulic applications. Steel round bars are often used in the construction of hydraulic cylinders due to their high tensile strength and ability to withstand heavy loads and pressure. Additionally, steel can be easily machined and welded, allowing for precise manufacturing and customization of hydraulic cylinders. Overall, steel round bars provide the necessary qualities and performance required for the production of hydraulic cylinders.

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