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: Can steel round bars be used for structural purposes?: Indeed, steel round bars have the capability to serve structural purposes. Due to their robustness and endurance, round bars are frequently employed in construction and engineering ventures. These bars function as weight-bearing elements in edifices, bridges, and other structures, offering essential support and stability. The availability of steel round bars in diverse grades and dimensions permits adaptability in both design and utilization. Moreover, they can be effortlessly welded, molded, and machined to fulfill precise project necessities, rendering them a favored option for structural applications.

Q: What is the difference between a bright and a rough turned steel round bar?: A bright turned steel round bar and a rough turned steel round bar differ primarily in their surface finish and the level of precision involved in their manufacturing processes. A bright turned steel round bar has a smooth, shiny surface finish. This is achieved by subjecting the bar to additional processes such as polishing or grinding after the initial turning operation. The bright surface finish gives the bar an aesthetically pleasing appearance and can also provide improved corrosion resistance. On the other hand, a rough turned steel round bar has a more textured surface finish. It is typically obtained directly from the turning operation without any additional processes to refine the surface. The rough surface finish may have visible tool marks and a slightly uneven texture. In terms of manufacturing precision, a bright turned steel round bar is typically more accurate and precise in terms of its dimensions and tolerances. The additional processes involved in achieving a bright surface finish also allow for tighter control over the bar's specifications. This makes bright turned bars suitable for applications where precise dimensions and tolerances are critical. In contrast, a rough turned steel round bar may have slightly looser tolerances due to the nature of the turning process and the lack of additional refining operations. However, the rough turned bars can still meet the requirements of many applications that do not require high precision. Overall, the choice between a bright and a rough turned steel round bar will depend on the specific application and the desired surface finish and precision.

Q: What is the tolerance for diameter in steel round bars?: The tolerance for diameter in steel round bars may differ based on the manufacturer or industry's specific standards and requirements. Typically, a certain range is specified for the diameter tolerance to maintain the desired precision and consistency in the bars' dimensions. This tolerance is usually denoted as a plus or minus value, indicating the acceptable deviation from the specified diameter. To ascertain the precise tolerance for diameter in steel round bars, it is essential to verify the applicable industry standards or consult with the manufacturer, as it can vary depending on the intended application and manufacturing process employed.

Q: What is the difference between a forged and a ground steel round bar?: A forged steel round bar is made by heating and shaping the steel through a process called forging, which involves applying extreme pressure to shape and compress the metal. This process enhances the strength and durability of the steel, making it suitable for applications that require high strength and resistance to wear and impact. On the other hand, a ground steel round bar is produced by removing material from the surface of a steel bar using grinding or machining processes. This results in a precise diameter and smooth surface finish, making it ideal for applications that require tight tolerances and a polished appearance. In summary, the main difference between a forged and a ground steel round bar lies in their manufacturing processes and resulting properties. Forged steel offers superior strength and toughness, while ground steel provides precise dimensions and a refined surface finish.

Q: Why is a steel rope made of many wires rather than a round bar of steel?: It is a strand of steel that bends more easily. In general, but the tensile strength is still a single good, but many shares of a broken, will soon be found, easy to change in time, or a broken, immediately out of the accident.

Q: How are steel round bars used in the automotive industry?: Due to their strength, durability, and versatility, steel round bars are commonly employed in the automotive industry for a range of purposes. The production of crankshafts is one of the primary uses of steel round bars in this industry. Crankshafts are essential in converting the reciprocating motion of pistons into rotational motion, which powers the vehicle. Steel round bars are highly suitable for this function due to their high tensile strength, exceptional fatigue resistance, and ability to endure high torque loads. Steel round bars are also utilized in the manufacture of axles. Axles play a critical role in transferring power from the engine to the wheels while supporting the vehicle's weight and ensuring stability. Steel round bars provide the necessary strength and rigidity to handle the substantial loads and forces experienced by axles. Furthermore, steel round bars are employed in the production of suspension components like tie rods and sway bars. Tie rods are crucial for steering and maintaining proper alignment, while sway bars help control body roll and enhance handling. Steel round bars are preferred for these applications due to their exceptional torsional strength, enabling them to withstand the forces and stresses encountered during steering and suspension movements. Moreover, steel round bars are used in the creation of transmission shafts. Transmission shafts are responsible for transmitting power from the engine to the wheels through the gearbox. Steel round bars are well-suited for this task due to their high strength, resistance to bending, and ability to handle the rotational forces and torque generated by the engine. In conclusion, steel round bars are extensively employed in the automotive industry for various applications including 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: What are the advantages of using aluminum-silicon alloy steel round bars?: One of the advantages of using aluminum-silicon alloy steel round bars is their high strength-to-weight ratio. This makes them lightweight yet robust, making them suitable for a wide range of applications where both strength and weight are important factors. Additionally, the alloy's excellent corrosion resistance properties make it highly durable and long-lasting, reducing maintenance and replacement costs. Another advantage is its good thermal conductivity, making it useful in applications that require efficient heat transfer. Overall, aluminum-silicon alloy steel round bars offer a combination of strength, lightness, corrosion resistance, and thermal conductivity, making them a versatile and advantageous material choice.

Q: Can steel round bars be used as axles or shafts?: Yes, steel round bars can be used as axles or shafts. Steel is a commonly used material for axles and shafts due to its high strength and durability. Steel round bars are particularly suitable for applications requiring rotational motion, such as axles and shafts, as they can handle heavy loads and withstand bending and torsional forces. Additionally, steel round bars can be machined and heat-treated to meet specific requirements for hardness and surface finish, further enhancing their suitability as axles or shafts. Overall, steel round bars are a reliable and widely used choice for axles and shafts in various industries, including automotive, machinery, and construction.

Q: Can steel round bars be used for making sway bars?: Yes, steel round bars can be used for making sway bars.

Q: How strong are steel round bars compared to other materials?: Steel round bars, renowned for their exceptional strength and durability, are widely recognized as one of the toughest materials available. In comparison to aluminum, brass, and wood, steel round bars boast a significantly higher tensile strength, referring to their capacity to withstand pulling forces without succumbing to breakage. Moreover, steel round bars are capable of handling higher compressive loads, rendering them highly suitable for applications involving substantial pressure or heavy loads. Not only do steel round bars exhibit remarkable strength, but they also showcase excellent ductility, allowing for easy shaping and bending without any risk of fracture. This remarkable feature grants steel round bars versatility, which explains their extensive utilization in diverse industries such as construction, automotive, manufacturing, and aerospace. While other materials possess their own distinctive properties and applications, steel round bars consistently remain the preferred choice in terms of strength and reliability. Their ability to endure high loads, resist deformation, and maintain structural integrity positions them as a favored option for structural components, shafts, axles, and various other demanding applications.

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