Plain 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:How are steel round bars used in the construction of high-rise buildings?: Due to their strength, durability, and versatility, steel round bars are commonly utilized in the construction of high-rise buildings. Carbon steel is typically used to manufacture these bars because it possesses excellent mechanical properties and can endure high loads and pressures. In reinforced concrete structures for high-rise buildings, steel round bars are primarily employed. They serve as reinforcement in concrete beams, columns, and slabs. By embedding the bars in the concrete, the overall structure gains added strength and stiffness. One of the main benefits of utilizing steel round bars is their ability to withstand tension forces. Concrete is strong in compression but weak in tension. Therefore, the steel bars act as tension reinforcement, preventing the concrete from cracking or failing when subjected to tension loads. This significantly improves the building's structural integrity and overall safety. Moreover, steel round bars offer easy bending, shaping, and welding, allowing for flexible design and construction options. They can be customized to specific lengths and diameters to meet the requirements of the building project. This adaptability makes them ideal for constructing various structural elements, like beams and columns, which must be precisely engineered to support the weight and stresses of a high-rise building. Furthermore, steel round bars exhibit excellent resistance to corrosion, which proves crucial when constructing high-rise buildings exposed to various environmental elements. The steel's corrosion-resistant properties ensure the structure's long-term durability and lifespan. In conclusion, steel round bars are essential in the construction of high-rise buildings as they provide strength, durability, and flexibility to reinforced concrete structures. They enhance the overall structural integrity, safety, and longevity of the building, making them a crucial component in modern construction practices.

Q:How can steel round bars be protected against rust?: There are various ways to protect steel round bars from rust. One popular method involves applying a protective coating, like paint or a rust-resistant primer, which acts as a barrier between the steel and its surroundings, preventing moisture and oxygen from reaching the metal surface. Another effective approach is to galvanize the steel by immersing it in molten zinc. This creates a sacrificial barrier that shields the steel, even if it gets scratched or damaged. Maintaining the steel round bars is crucial in preventing rust. This involves keeping them clean and dry, as moisture is a major catalyst for rust formation. Regular inspections for rust or damage and prompt repairs are also important to prevent further corrosion. Storing the bars in a dry and well-ventilated area can help reduce the risk of rust. Elevating the bars off the ground or using moisture-absorbing materials, like silica gel packets, can provide additional protection against moisture buildup. Lastly, using corrosion inhibitors or rust-preventative oils can create a thin film on the surface that inhibits rust formation. By implementing these methods, steel round bars can be effectively shielded from rust, ensuring their durability and structural integrity.

Q:What are the corrosion resistance properties of steel round bars?: Steel round bars have excellent corrosion resistance properties due to the presence of alloying elements such as chromium, nickel, and molybdenum. These elements form a protective oxide layer on the surface of the steel, which prevents the underlying metal from coming into contact with corrosive substances. The chromium in steel round bars reacts with oxygen in the air to form a thin, invisible layer of chromium oxide. This layer acts as a barrier, protecting the steel from further oxidation and corrosion. Nickel and molybdenum enhance the corrosion resistance of steel by increasing its resistance to pitting, crevice corrosion, and chloride-induced stress corrosion cracking. In addition to alloying elements, the manufacturing process can also affect the corrosion resistance of steel round bars. For instance, stainless steel round bars are often passivated, which involves the removal of free iron and other contaminants from the surface. Passivation enhances the corrosion resistance of the steel by creating a clean and inert surface that is less prone to corrosion. Overall, steel round bars are known for their excellent corrosion resistance properties, making them suitable for a wide range of applications in various industries, including construction, marine, automotive, and aerospace.

Q:Are steel round bars suitable for marine environments?: Yes, steel round bars can be suitable for marine environments, but it depends on the specific type of steel used and the conditions of the marine environment. Stainless steel is often the preferred choice for marine applications due to its excellent corrosion resistance properties. Stainless steel contains chromium, which forms a protective layer on the surface of the steel, preventing corrosion and rusting. However, not all steel round bars are suitable for marine environments. Carbon steel, for example, is more susceptible to corrosion in marine environments, especially in the presence of saltwater. Carbon steel should be carefully protected with coatings or treatments to prevent corrosion. Additionally, the conditions of the marine environment also play a significant role in determining the suitability of steel round bars. Factors such as the salinity of the water, exposure to chemicals, temperature variations, and physical stress can affect the corrosion resistance of steel. In highly corrosive marine environments, it is advisable to use specialized marine-grade stainless steel or other corrosion-resistant alloys. Ultimately, it is crucial to select the appropriate grade of steel and consider additional protective measures, such as coatings or galvanization, to enhance the durability and longevity of steel round bars in marine environments.

Q:Can steel round bars be used for making rebar?: No, steel round bars cannot be used for making rebar. Rebar, or reinforcing bar, is specifically designed and manufactured with deformations or ribs on its surface to enhance the bond with concrete. These deformations provide better grip and prevent slippage between the rebar and concrete, thus improving the structural integrity of a reinforced concrete structure. On the other hand, steel round bars have a smooth surface and lack the necessary deformations, making them unsuitable for rebar applications. It is important to use rebar that meets the required standards and specifications to ensure the safety and durability of the concrete structure.

Q:What is the difference between a hot-rolled and a peeled steel round bar?: The main difference between a hot-rolled and a peeled steel round bar lies in their manufacturing processes. A hot-rolled steel round bar is formed by heating a metal billet or ingot to a high temperature and then rolling it into its final shape and size. This process results in a rougher surface texture and a larger diameter tolerance. On the other hand, a peeled steel round bar undergoes an additional step called peeling after the hot-rolling process. In this step, the outer surface of the bar is removed by rotating it against a stationary cutting tool. This process improves the surface finish and dimensional accuracy of the round bar, resulting in a smoother and more precise product. In summary, while both hot-rolled and peeled steel round bars are commonly used in various industries, the peeled bar offers superior surface finish and dimensional accuracy due to the additional peeling step in its manufacturing process.

Q:What is the tolerance for length in steel round bars?: The tolerance for length in steel round bars can vary based on specific manufacturing standards and requirements. Typically, the tolerance is defined as the maximum allowable deviation from the desired length and can be expressed as a percentage or specific measurement in millimeters or inches. Various international standards organizations, such as ASTM or ISO, may have their own guidelines for steel round bar tolerances. These standards ensure consistent and reliable measurements across the industry. In practice, tolerances for steel round bar length can range from tight tolerances of a few millimeters for precision applications to looser tolerances of several centimeters for general-purpose use. It is important to consider that the tolerance may also depend on the size and diameter of the bar. Smaller diameter bars may have tighter tolerances due to the challenges in manufacturing and accurately measuring longer lengths. Ultimately, the specific tolerance for steel round bar length should be determined based on the intended application and relevant industry standards or customer specifications.

Q:Can steel round bars be used for hydraulic applications?: Yes, steel round bars can be used for hydraulic applications. Steel is known for its strength and durability, making it a suitable material for hydraulic systems that require high pressure and heavy loads. Steel round bars can be used to manufacture various hydraulic components such as cylinders, pistons, shafts, and valves. The hardness and corrosion resistance of steel also make it a reliable choice for hydraulic applications where the fluid may contain contaminants or have high temperatures. However, it is important to consider the specific requirements of the hydraulic application and select the appropriate grade and type of steel round bars to ensure optimal performance and longevity.

Q:What is the typical yield strength of a steel round bar?: The yield strength of a steel round bar can vary depending on the grade of steel used. Most common grades of steel typically have a yield strength ranging from 36,000 to 80,000 psi. It should be noted that this range is a general guideline and there may be exceptions and variations among different grades of steel. The yield strength can also be influenced by factors such as the manufacturing process and any additional treatments or heat treatments applied to the steel. Therefore, it is advisable to consult the specific material specifications or seek advice from a metallurgical expert for accurate and precise information on the yield strength of a particular steel round bar.

Q:Can steel round bars be used for making brake components?: Yes, steel round bars can be used for making brake components. Steel is a commonly used material in brake systems due to its high strength, durability, and heat resistance properties. Steel round bars can be machined and shaped into various brake components such as brake discs, brake rotors, brake calipers, and brake pistons. The use of steel round bars ensures the brake components can withstand the high pressures and temperatures generated during braking, providing reliable and efficient stopping power.

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