Roung BAR

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Loading Port:: China Main Port

Payment Terms:: TT OR LC

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Product Description:

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: Theprice 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 maximum temperature that steel round bars can withstand?: The maximum temperature that steel round bars can withstand depends on the specific grade or type of steel being used. Generally, carbon steel can withstand temperatures up to around 1,482 degrees Celsius (2,700 degrees Fahrenheit) before it starts to lose its structural integrity. However, it is important to note that different alloying elements and manufacturing processes can alter the maximum temperature tolerance of steel. For example, stainless steel can withstand higher temperatures than carbon steel due to its increased resistance to oxidation and corrosion. Furthermore, it is essential to consider the duration of exposure to high temperatures, as prolonged heat exposure can lead to softening and eventual failure of the steel. Therefore, it is crucial to consult the manufacturer's specifications or seek professional advice to determine the maximum temperature that a specific steel round bar can withstand in a given application.

Q: Can steel round bars be used in the manufacturing of springs?: Yes, steel round bars can be used in the manufacturing of springs. Steel is a common material used in spring manufacturing due to its excellent properties such as high strength, durability, and flexibility. Steel round bars can be shaped and formed into the desired spring shape using various manufacturing processes like hot rolling, cold drawing, or machining. The specific type of steel round bar used will depend on the application and desired characteristics of the spring, such as the level of stiffness or resistance required. Overall, steel round bars are a widely used and reliable choice for the manufacturing of springs.

Q: Are steel round bars suitable for the manufacturing of shafts?: Yes, steel round bars are highly suitable for the manufacturing of shafts. Steel round bars offer excellent strength, durability, and resilience, making them ideal for applications that require transmitting power, such as in shafts. Their uniform shape and consistent diameter also facilitate ease of machining and assembly, further enhancing their suitability for shaft manufacturing.

Q: What are the different types of surface defects that can occur in steel round bars?: Steel round bars can experience multiple types of surface defects. Some of the most frequently encountered defects include the following: 1. Scratches: These shallow grooves or marks on the round bar's surface occur due to friction or contact with sharp objects during handling or transportation. 2. Pitting: Small, localized cavities or depressions on the surface are caused by corrosion or exposure to harsh environments. If left unaddressed, pitting can lead to further corrosion. 3. Scale: During the manufacturing process, a thin layer of oxide or impurities, known as scale, can form on the surface of steel round bars. Although it affects appearance and quality, scale is often removed during subsequent processing or cleaning. 4. Scabs: Irregularly shaped protrusions or raised areas on the surface result from solidification or cooling issues during the casting process. Proper attention is required to ensure the strength and integrity of the bar. 5. Roll marks: Elongated depressions or ridges on the surface are caused by uneven or improper rolling during manufacturing. Roll marks can impact the dimensional accuracy of the bar and may necessitate additional processing or grinding for removal. 6. Laminations: Sometimes visible on the surface, laminations are internal defects resulting from improper bonding or separation of layers during the steelmaking process. They can weaken the bar and reduce its load-bearing capacity. 7. Inclusions: Non-metallic particles or impurities can become trapped in the steel during manufacturing, appearing as dark spots or irregularities on the round bar's surface. Inclusions can affect the bar's mechanical properties. It is essential to recognize that the severity and impact of these surface defects may vary. Manufacturers and quality control personnel employ diverse inspection techniques to identify and mitigate these defects, ensuring the quality and reliability of the final product.

Q: What is the difference between a polished and a precision ground steel round bar?: A polished steel round bar refers to a bar that has undergone a polishing process to achieve a smooth and shiny surface finish. This process involves using abrasive materials to remove any imperfections or roughness on the surface of the bar. The end result is a visually appealing bar with a high level of aesthetic appeal. On the other hand, a precision ground steel round bar is a bar that has been precisely ground to achieve tight dimensional tolerances and a smooth surface finish. This grinding process involves removing material from the surface of the bar using grinding wheels or other cutting tools. The purpose of precision grinding is to ensure that the bar meets specific size and shape requirements, making it suitable for use in applications that demand precise dimensions and tight tolerances. In summary, the main difference between a polished and a precision ground steel round bar lies in the purpose of the respective finishing processes. Polishing is primarily done for aesthetic reasons, enhancing the appearance of the bar, while precision grinding focuses on achieving precise dimensions and tight tolerances to meet specific technical requirements.

Q: Can steel round bars be galvanized?: Yes, steel round bars can be galvanized. Galvanizing is a process of coating steel with a layer of zinc to protect it from corrosion. This process is commonly used to increase the longevity and durability of steel products, including round bars.

Q: Can steel round bars be used for making agricultural equipment?: Yes, steel round bars can be used for making agricultural equipment. Steel round bars are known for their high strength and durability, making them suitable for heavy-duty applications in the agricultural industry. They can be used to manufacture various agricultural equipment such as plows, tillers, cultivators, harrows, and seeders. The strength of steel round bars allows these equipment to withstand the harsh conditions in the field, including the impact of rocks and hard soil. Additionally, steel round bars can be easily shaped and welded, providing flexibility in designing and customizing agricultural equipment according to specific requirements. Overall, steel round bars are a reliable and cost-effective material choice for making agricultural equipment due to their strength, durability, and versatility.

Q: What are the different surface hardness options for steel round bars?: The different surface hardness options for steel round bars depend on the specific heat treatment processes used. Common options include annealing for softening the steel and improving machinability, normalizing for uniform grain structure and increased strength, quenching and tempering for achieving high hardness and toughness, and case hardening techniques like carburizing or nitriding to create a hard outer layer while maintaining a softer core.

Q: What are the advantages of using nickel-chromium alloy steel round bars?: Using nickel-chromium alloy steel round bars in various applications offers several benefits. Firstly, these round bars possess outstanding corrosion resistance properties. The inclusion of nickel and chromium elements in the alloy enhances its ability to withstand corrosion from moisture, chemicals, and oxidation, making it suitable for use in challenging environments like marine applications, chemical processing plants, and oil refineries. Secondly, these round bars exhibit high temperature resistance. The combination of nickel and chromium in the alloy allows it to endure elevated temperatures without compromising its structural integrity. This makes them ideal for use in heat exchangers, furnaces, and other high-temperature applications. Furthermore, these round bars boast exceptional mechanical properties. They demonstrate excellent strength, toughness, and wear resistance, making them ideal for applications that require high load-bearing capabilities. Additionally, they exhibit good ductility, enabling easy machining and fabrication. Additionally, these round bars possess good electrical conductivity, making them suitable for electrical and electronic applications where conductivity is crucial, such as in the manufacturing of resistors, heating elements, and electrical connectors. Lastly, these round bars are readily available and cost-effective. Being a widely used material in various industries, they are easily accessible and can be obtained at competitive prices. In conclusion, the advantages of utilizing nickel-chromium alloy steel round bars encompass excellent corrosion resistance, high-temperature resistance, superior mechanical properties, good electrical conductivity, and cost-effectiveness. These characteristics make them the preferred choice for a wide range of applications in industries such as construction, automotive, aerospace, and electrical engineering.

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