mild steel 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: Are steel round bars susceptible to cracking?: Yes, steel round bars can be susceptible to cracking under certain conditions. The specific factors that can contribute to cracking in steel round bars include high stress levels, improper heat treatment, and the presence of impurities or defects in the material. Additionally, sudden changes in temperature or excessive loading can also increase the likelihood of cracking. It is important to note that steel round bars can vary in their susceptibility to cracking depending on the specific grade and composition of the steel. Some types of steel, such as low carbon or mild steel, are generally less prone to cracking compared to higher carbon or alloy steels. To mitigate the risk of cracking, proper handling and storage of steel round bars is crucial. This includes avoiding dropping or mishandling the bars, as well as storing them in a dry and controlled environment to prevent corrosion. Furthermore, proper heat treatment processes, such as annealing or tempering, can help improve the structural integrity of steel round bars and reduce the risk of cracking. Additionally, regular inspections and testing for any potential defects or impurities can help identify and address any issues before they lead to cracking. Overall, while steel round bars can be susceptible to cracking, taking appropriate precautions and utilizing proper manufacturing and handling techniques can minimize the risk and ensure the integrity of the bars.

Q: What is the difference between a turned and a polished steel round bar?: A turned steel round bar and a polished steel round bar both undergo separate processes that result in different surface finishes and properties. A turned steel round bar is typically created by using a lathe machine to remove material from the surface of a steel bar. This process involves rotating the bar against a cutting tool, which cuts away the outer layer and leaves behind a smooth and cylindrical surface. The turned bar may have visible machining marks due to the cutting process, although it is generally considered to have a more precise and uniform diameter compared to other types of steel bars. Turned bars are often used in applications where dimensional accuracy is crucial, such as in machinery or tooling. On the other hand, a polished steel round bar undergoes a different process that involves grinding or buffing the surface to achieve a smooth and reflective finish. Polishing removes any imperfections or roughness from the surface of the steel bar, resulting in a highly lustrous appearance. Polished bars are often used in decorative applications or where visual aesthetics are important, such as in architectural designs or high-end consumer products. In summary, the main difference between a turned and a polished steel round bar lies in their respective manufacturing processes and resulting surface finishes. A turned bar is machined to achieve precise dimensions, while a polished bar is subjected to a polishing process to obtain a smooth and reflective surface. The choice between the two depends on the specific requirements of the application, with turned bars being preferred for dimensional accuracy and polished bars for aesthetic appeal.

Q: What is the elongation of a steel round bar?: The elongation of a steel round bar refers to the amount of lengthening or stretching the bar undergoes when subjected to an applied force or load.

Q: What are the different tolerances for steel round bars?: The different tolerances for steel round bars depend on various factors such as the diameter, length, and intended application. Common tolerances for steel round bars include diameter tolerances ranging from +/- 0.005 inches to +/- 0.030 inches, length tolerances ranging from +/- 0.125 inches to +/- 0.500 inches, and straightness tolerances ranging from 0.0125 inches per foot to 0.030 inches per foot. However, specific tolerances may vary depending on the specific requirements set by the industry or customer.

Q: What are the advantages of using nickel-tungsten alloy steel round bars?: There are several advantages to using nickel-tungsten alloy steel round bars. Firstly, the inclusion of nickel enhances the corrosion resistance of the bars, making them suitable for use in harsh environments. Additionally, the addition of tungsten improves the strength and hardness of the bars, making them highly durable and able to withstand heavy loads and high temperatures. Furthermore, the alloy steel composition provides excellent wear resistance, making these bars ideal for applications that require prolonged use or frequent contact with abrasive materials. Overall, nickel-tungsten alloy steel round bars offer a combination of corrosion resistance, strength, and durability, making them a reliable choice for various industrial applications.

Q: What is the maximum length of a steel round bar available?: The maximum length of a steel round bar available depends on various factors such as the manufacturing capabilities of the steel supplier, transportation limitations, and practical considerations. However, typical maximum lengths range from 20 to 40 feet (6 to 12 meters), but it is always best to consult with a steel supplier to determine the specific lengths they offer.

Q: Can steel round bars be used for making shock absorber components?: Absolutely! When it comes to constructing shock absorber components, steel round bars are a fantastic choice. The reason being, steel possesses exceptional qualities including robustness, longevity, and the ability to withstand wear and tear. By utilizing steel round bars, it becomes possible to craft a multitude of shock absorber elements, including piston rods, mounting brackets, and tube bodies, through either machining or forging methods. The incorporation of steel guarantees that these components can endure the immense pressures and forces linked to shock absorption, thereby ensuring vehicle stability and seamless functionality.

Q: What is the resistance to fatigue of a steel round bar?: The resistance to fatigue of a steel round bar refers to its ability to withstand repeated loading and unloading cycles without experiencing failure or damage. This property is typically evaluated through fatigue testing, where the bar is subjected to a controlled number of stress cycles. The resistance to fatigue of a steel round bar depends on various factors such as the material composition, heat treatment, surface finish, and the presence of any defects or discontinuities.

Q: What are the applications of steel round bars?: Steel round bars have a wide range of applications across various industries due to their inherent strength, durability, and versatility. Some of the key applications of steel round bars include: 1. Construction: Steel round bars are extensively used in the construction industry for various structural purposes. They are commonly used for building columns, beams, and frames due to their high strength-to-weight ratio, which ensures stability and safety in construction projects. 2. Manufacturing: Steel round bars are widely used in the manufacturing sector for fabricating various components and machinery. They are commonly employed in the production of gears, shafts, axles, and other machine parts that require high strength and precision. 3. Automotive industry: Steel round bars find significant applications in the automotive industry. They are used in the manufacturing of crankshafts, connecting rods, suspension components, and many other parts, providing strength and reliability to vehicles. 4. Oil and gas industry: In the oil and gas sector, steel round bars are used for manufacturing drill bits, valves, pipes, and other equipment that are exposed to harsh environmental conditions and require high strength and corrosion resistance. 5. Aerospace industry: Steel round bars are essential in the aerospace industry due to their high strength and lightweight properties. They are used in the production of aircraft components, such as landing gear, engine parts, and structural components. 6. Shipbuilding: Steel round bars are commonly used in shipbuilding due to their excellent strength and corrosion resistance. They are used in the construction of ship frames, hulls, and other critical components that require durability and resistance to harsh marine environments. 7. Infrastructure projects: Steel round bars are extensively used in infrastructure projects, such as bridges, tunnels, and railways. They provide the necessary strength and stability required for supporting heavy loads and ensuring the structural integrity of these projects. 8. Furniture and interior design: Steel round bars are also used in the furniture and interior design industry. They are commonly employed in the construction of chairs, tables, shelves, and other furniture pieces due to their sleek appearance, durability, and easy formability. Overall, steel round bars have a wide range of applications in various industries, contributing to the development of robust and reliable structures, machinery, and equipment.

Q: Can steel round bars be used in the automotive parts industry?: Yes, steel round bars can be used in the automotive parts industry. Steel round bars are commonly used in the manufacturing of various automotive components due to their excellent strength, durability, and resistance to wear and tear. These bars can be fabricated into different shapes and sizes to meet the specific requirements of automotive parts such as axles, drive shafts, suspension components, steering components, and gears. The use of steel round bars ensures the structural integrity and reliability of automotive parts, making them ideal for withstanding the demanding conditions and loads experienced in the automotive industry.

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