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: What are the different types of steel round bars used in the defense industry?: In the defense industry, various steel round bars are commonly employed due to their strength, durability, and ability to withstand harsh conditions. Some of the frequently utilized types are as follows: 1. High-strength low-alloy (HSLA) steel round bars: These bars possess a high strength-to-weight ratio, making them ideal for applications where weight reduction is crucial. They find extensive use in the construction of armored vehicles, tanks, and other military equipment. 2. Stainless steel round bars: Stainless steel exhibits remarkable resistance to corrosion and rust, making it an excellent choice for defense applications exposed to moisture or harsh environments. Its wide usage includes the manufacturing of military aircraft, naval vessels, and firearms. 3. Carbon steel round bars: Carbon steel is a versatile and cost-effective material extensively used in the defense industry. It offers excellent strength and hardness, making it suitable for various applications, such as missile components, gun barrels, and armor plates. 4. Alloy steel round bars: Alloy steel is a blend of different metals, typically including chromium, molybdenum, and nickel, which enhances its mechanical properties. It finds common application in the production of military-grade vehicles, artillery systems, and munitions. 5. Tool steel round bars: Tool steel is specifically designed to possess exceptional hardness, wear resistance, and toughness. It is often employed in the manufacturing of cutting tools, drills, and other equipment utilized in the defense industry. Each type of steel round bar possesses unique properties and advantages, enabling it to meet specific requirements within the defense sector. The selection of the appropriate steel round bar depends on the specific application and the desired performance characteristics needed to meet the demands of the defense industry.

Q: How do you measure the hardness of a steel round bar?: The hardness of a steel round bar can be measured using various methods, with the most common being the Rockwell hardness test. In this test, a diamond or steel ball indenter is pressed into the surface of the steel at a specific load, and the depth of the indentation is measured. The hardness value is determined based on the depth of the indentation and the applied load. Other methods like Brinell and Vickers hardness tests can also be used, depending on the specific requirements and characteristics of the steel.

Q: What is the maximum hardness achievable for steel round bars?: The maximum hardness achievable for steel round bars depends on various factors such as the specific type of steel used, the heat treatment process applied, and the desired properties. However, in general, the maximum hardness achievable for steel round bars is typically around 60-65 HRC (Rockwell hardness scale) for high carbon steels, and can be even higher for certain specialty alloys or through additional surface treatments.

Q: Are steel round bars suitable for use in food processing equipment?: Steel round bars are not suitable for use in food processing equipment. This is because food processing equipment necessitates materials that can resist corrosion, are easy to clean, and do not react with food substances. Although steel round bars are strong and durable, they have a tendency to rust and can potentially contaminate food with metallic particles. On the other hand, stainless steel is the ideal choice for food processing equipment due to its high resistance to corrosion, ease of cleaning, and non-reactive properties. It is crucial to prioritize the safety and hygiene of food processing equipment, which is why steel round bars should not be utilized in this context.

Q: Is round steel round steel?: Round steel is a solid strip of steel whose cross section is round. The specifications are expressed in millimeters of diameter, such as "50", which means a round bar of 50 millimeters in diameter.

Q: Can steel round bars be used for making mining equipment?: Certainly! Mining equipment can indeed be made using steel round bars. These bars, owing to their exceptional strength, durability, and resistance to wear and tear, are widely utilized in the manufacturing process of various mining equipment. They are particularly suitable for applications that demand robust and heavy-duty machinery, such as drilling rigs, excavators, crushers, and conveyor systems employed in the mining industry. The adaptability of steel round bars enables them to be machined, welded, and shaped into diverse forms and sizes, thus facilitating the customization of mining equipment to cater to specific requirements. Moreover, steel round bars exhibit remarkable resilience in mining environments, enduring exposure to abrasive substances, extreme temperatures, and substantial loads.

Q: What are the advantages of using nickel-copper alloy steel round bars?: There are several advantages of using nickel-copper alloy steel round bars. Firstly, nickel-copper alloy steel has excellent resistance to corrosion and oxidation. This makes it ideal for applications in harsh environments, such as marine or chemical industries, where the bars may come into contact with corrosive substances or saltwater. The high resistance to corrosion ensures the longevity and durability of the round bars, reducing the need for frequent replacements. Secondly, nickel-copper alloy steel round bars have excellent mechanical properties. The addition of nickel and copper to the alloy enhances its strength, toughness, and hardness. This makes the bars suitable for heavy-duty applications that require high strength and durability, such as in construction, manufacturing, and engineering. The superior mechanical properties of nickel-copper alloy steel round bars allow them to withstand heavy loads and resist deformation or breakage, contributing to the overall safety and reliability of the structures or components they are used in. Another advantage of using nickel-copper alloy steel round bars is their excellent thermal stability. The alloy has a low coefficient of thermal expansion, meaning it can withstand high temperatures without significant dimensional changes. This property is particularly important in applications that involve exposure to extreme heat, such as in the aerospace or power generation industries. The thermal stability of the round bars ensures their dimensional integrity, reducing the risk of warping or cracking under high-temperature conditions. Furthermore, nickel-copper alloy steel round bars offer good electrical conductivity. This property is beneficial in applications that require the transmission of electric current, such as in electrical wiring or power distribution systems. The high electrical conductivity of the alloy ensures efficient and reliable electrical connections, minimizing power loss and maximizing performance. In conclusion, the advantages of using nickel-copper alloy steel round bars include excellent corrosion resistance, superior mechanical properties, thermal stability, and good electrical conductivity. These characteristics make the bars suitable for a wide range of applications in various industries, providing durability, strength, and reliability.

Q: How can steel round bars be protected against rust?: Steel round bars can be protected against rust by applying a protective coating such as paint, galvanizing, or epoxy. Regular maintenance, including cleaning and applying rust inhibitors, is also crucial to prevent rust formation. Additionally, storing the bars in a dry environment and avoiding exposure to moisture can help minimize the risk of rusting.

Q: How do steel round bars compare to other types of steel products?: Steel round bars have several advantages over other types of steel products. Firstly, their cylindrical shape makes them highly versatile and easy to work with, allowing for various applications in construction, manufacturing, and engineering. Secondly, round bars have superior strength and durability, making them ideal for load-bearing structures and heavy-duty machinery. Additionally, their uniformity and smooth surface facilitate precision machining and fabrication processes. Lastly, steel round bars offer excellent resistance to corrosion and wear, ensuring a longer lifespan compared to other steel products. Overall, their unique properties and versatility make steel round bars a preferred choice for many industries.

Q: What is the difference between a hot-rolled and a cold-drawn steel round bar?: The manufacturing process and resulting properties distinguish a hot-rolled steel round bar from a cold-drawn one. To produce hot-rolled bars, a billet or ingot is heated to a high temperature, typically around 1100 to 1300 degrees Celsius, and then rolled into the desired shape and size. This process yields a rougher surface finish and larger tolerances compared to cold-drawn bars. Hot-rolled bars exhibit less precision in dimensions and may contain surface defects such as scale or rust. In contrast, cold-drawn bars undergo manufacturing by pulling a hot-rolled bar through a die at room temperature. This process reduces the diameter and enhances the surface finish, resulting in a smoother and more precise product. Cold-drawing also improves the mechanical properties of the steel, including increased strength, hardness, and improved surface quality. The cold-drawing process provides closer dimensional tolerances, making cold-drawn bars suitable for applications that demand higher precision. In conclusion, the distinction between hot-rolled and cold-drawn steel round bars lies in the manufacturing process, resulting in differences in surface finish, dimensional tolerances, and mechanical properties. Hot-rolled bars are produced at high temperatures, possess a rougher surface, and have larger tolerances. On the other hand, cold-drawn bars are manufactured at room temperature, exhibit a smoother surface, closer dimensional tolerances, and enhanced mechanical properties. The choice between the two depends on specific application requirements and the desired characteristics of the final product.

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