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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 corrosion-resistant?: The corrosion resistance of steel round bars varies depending on the specific steel type and the conditions they are exposed to. Stainless steel round bars, for instance, possess exceptional corrosion resistance due to the inclusion of chromium and other alloying elements. These elements facilitate the formation of a protective oxide layer on the steel's surface, which effectively prevents corrosion and rusting. However, not all steel round bars possess inherent corrosion resistance. Carbon steel round bars, for instance, are more susceptible to corrosion and necessitate protective coatings or treatments to enhance their resistance. Therefore, it is crucial to consider the precise grade and composition of steel round bars to determine their corrosion resistance properties.

Q: What is the difference between a polished and a hot rolled steel round bar?: The manufacturing processes and resulting surface finishes distinguish polished steel round bars from hot rolled ones. To produce hot rolled steel round bars, a steel billet or ingot is heated to high temperatures and then shaped into a round bar through rolling. This method yields a surface finish that is rough and uneven, with mill scale and imperfections. Hot rolled bars are typically utilized in applications where surface finish is not crucial, such as structural components, machinery parts, and construction materials. In contrast, polished steel round bars undergo additional steps to achieve a smooth and glossy surface finish. Following the hot rolling process, these bars undergo various grinding and polishing techniques to eliminate mill scale, surface imperfections, and achieve a consistent finish. The result is a refined and visually appealing surface, suitable for applications where appearance matters, such as decorative items, furniture, and architectural components. Aside from surface finish, the mechanical properties of the two types of steel round bars can also differ. Hot rolled bars tend to possess a rougher surface and may exhibit residual stresses, while polished bars feature a smoother surface and reduced internal stresses. However, the overall mechanical properties, including strength and hardness, are predominantly determined by the grade and composition of the steel used, rather than the manufacturing process or surface finish. In conclusion, the discrepancy between polished and hot rolled steel round bars lies in their surface finish. Hot rolled bars have a rough and uneven surface with mill scale and imperfections, while polished bars undergo further processing for a smooth and glossy finish. The choice between the two depends on the specific application and desired appearance of the final product.

Q: How do steel round bars compare to other materials like aluminum or titanium?: Steel round bars have certain advantages over materials like aluminum or titanium. Steel is known for its high strength and durability, making it suitable for heavy-duty applications. It has a higher tensile strength compared to aluminum, which gives it better resistance to bending or deformation. Additionally, steel round bars have a lower cost compared to titanium, making them more economical for various projects. However, aluminum and titanium offer their own unique benefits such as lighter weight and greater corrosion resistance, which may make them more suitable for specific applications. Ultimately, the choice between steel, aluminum, or titanium round bars depends on the specific requirements and constraints of the project at hand.

Q: Can steel round bars be used for making suspension springs?: Yes, steel round bars can be used for making suspension springs. Steel is a common material choice for suspension springs due to its strength, durability, and ability to withstand high loads and vibrations. Steel round bars can be readily shaped, tempered, and heat-treated to meet the specific requirements of suspension springs, providing necessary flexibility and resilience.

Q: How can I connect channel steel and round steel?: The connection of channel steel and round steel is done by welding, and the strength of the screw connection is not enough.

Q: How do steel round bars compare to concrete round bars?: There are several notable distinctions between steel round bars and concrete round bars. To begin with, steel round bars are composed of a robust and long-lasting material, while concrete round bars are made from a composite material containing cement, aggregates, and water. This dissimilarity in materials grants steel round bars a higher tensile strength and resistance to bending and deformation in contrast to concrete round bars, which are more susceptible to cracking and breaking under stress. Additionally, steel round bars provide greater flexibility in terms of design and customization. They can be easily molded, bent, and trimmed to specific lengths and dimensions, making them highly versatile for various applications. Conversely, concrete round bars are typically available in standard sizes and shapes, thereby limiting their design possibilities. Another crucial aspect to consider is weight. Steel round bars generally have a lighter weight compared to concrete round bars, rendering them easier to handle and transport. This weight advantage also results in reduced structural loads, allowing for more efficient and cost-effective construction. In regard to corrosion resistance, steel round bars necessitate additional protective measures such as coatings or galvanization to prevent rust and corrosion, particularly in humid or marine environments. Conversely, concrete round bars possess natural resistance to corrosion. This factor can significantly influence the long-term durability and maintenance requirements of a structure. Lastly, cost is a pivotal factor to take into account. Although steel round bars may entail a higher initial material cost compared to concrete round bars, their superior strength and durability can result in long-term cost savings. Concrete round bars may require more frequent maintenance and repairs, which can accumulate over time. In conclusion, steel round bars offer superior strength, flexibility, and durability in comparison to concrete round bars. However, the choice between the two is contingent upon the specific requirements of the project, including factors such as design flexibility, weight considerations, corrosion resistance, and cost.

Q: What is the yield strength to tensile strength ratio of a steel round bar?: The yield strength to tensile strength ratio of a steel round bar is typically around 0.85.

Q: Can steel round bars be used in the manufacturing of machinery?: Certainly, machinery manufacturing can make effective use of steel round bars. Various industries commonly employ steel round bars due to their robustness, longevity, and adaptability. These bars frequently serve in the fabrication of essential components like shafts, axles, gears, and other mechanical parts that necessitate exceptional strength and resistance against deterioration. Notably, steel round bars exhibit remarkable mechanical properties, encompassing impressive tensile strength and superior machinability, rendering them highly suitable for heavy-duty machinery and equipment. Furthermore, steel round bars can be conveniently welded, forged, or machined into the desired configuration, thus establishing them as a preferred option for machinery manufacturing.

Q: Can steel round bars be hardened?: Steel round bars can indeed be hardened through a specific procedure known as hardening. This procedure entails heating the steel to a precise temperature and swiftly cooling it, which is commonly referred to as quenching. The rapid cooling induces a transformation in the steel, leading to heightened hardness and strength. Typically, the hardening process is followed by tempering, which entails reheating the hardened steel to a lower temperature. This step serves to minimize brittleness and further enhance toughness. Hardening is extensively applied in the manufacturing of tools, machine parts, and various other applications that demand exceptional strength and durability.

Q: What are the advantages of using nickel-silicon alloy steel round bars?: Using nickel-silicon alloy steel round bars offers several advantages. Firstly, this alloy provides excellent resistance to corrosion and oxidation, making it highly durable and suitable for various applications in harsh environments. Secondly, the presence of nickel enhances the material's strength and toughness, making it ideal for use in high-stress applications. Additionally, the silicon content improves the alloy's heat resistance, allowing it to withstand elevated temperatures without significant deformation. Overall, nickel-silicon alloy steel round bars offer a combination of corrosion resistance, strength, toughness, and heat resistance, making them a preferred choice in numerous industries such as aerospace, automotive, and chemical.

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