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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: Can steel round bars be used in the electronics industry?: Yes, steel round bars can be used in the electronics industry. They are commonly used for various applications such as providing structural support, heat dissipation, and grounding in electronic devices and equipment. Additionally, steel round bars offer excellent strength, durability, and conductivity, making them suitable for use in the electronics industry.

Q: What are the different types of steel round bars used in the automotive chassis components?: There are several different types of steel round bars used in automotive chassis components, including carbon steel, alloy steel, stainless steel, and tool steel. Each type of steel offers different properties and strengths, allowing for the production of reliable and durable chassis components.

Q: Can steel round bars be machined using CNC equipment?: Yes, steel round bars can be machined using CNC equipment. CNC (Computer Numerical Control) machines are capable of accurately and precisely shaping steel round bars into various desired forms and dimensions.

Q: How do you measure the hardness of a steel round bar?: There are various methods to measure the hardness of a steel round bar, with the Rockwell hardness test being the most commonly used. This test involves applying a specific load to an indenter and measuring the depth of the resulting indentation on the material's surface. To measure the hardness of a steel round bar using the Rockwell hardness test, follow these steps: 1. Choose the appropriate Rockwell scale for the steel being tested. The commonly used scales for steel are HRC (Rockwell C) and HRB (Rockwell B). 2. Clean the surface of the steel round bar to eliminate any dirt, oil, or contaminants that could affect the test's accuracy. 3. Place the steel round bar on a flat and stable surface, ensuring proper support to prevent any movement during testing. 4. Select the suitable indenter for the chosen Rockwell scale. For HRC, a diamond cone indenter is typically used, while for HRB, a hardened steel ball is used. 5. Apply a preliminary minor load to the indenter, usually 10 kgf for HRC and 3 kgf for HRB. This ensures proper contact between the indenter and the material's surface. 6. Apply the major load, specific to the chosen Rockwell scale. For HRC, it is typically 150 kgf, while for HRB, it is usually 100 kgf. 7. Allow the major load to dwell for a specific period, typically 15 seconds, to ensure proper indentation. 8. Release the major load while maintaining the minor load. This allows the indenter to partially recover, reducing the depth of the indentation. 9. Measure the depth of the remaining indentation using a microscope or a specialized Rockwell hardness testing machine. The measured value corresponds to the hardness value on the chosen Rockwell scale. It's worth noting that the Rockwell hardness test is just one of several methods available to measure the hardness of a steel round bar. Depending on the specific requirements of the application, other methods like the Brinell hardness test or the Vickers hardness test may also be utilized.

Q: Can steel round bars be used in the automotive industry?: Yes, steel round bars can be used in the automotive industry. Steel round bars are commonly used in the automotive industry for various applications. They are often utilized for manufacturing components such as axles, drive shafts, suspension parts, and steering components. Steel round bars offer high strength, durability, and resistance to wear and tear, making them suitable for withstanding the demanding conditions and loads experienced by automotive components. Additionally, steel round bars can be easily machined and welded, allowing for efficient production and assembly processes in the automotive industry. Overall, steel round bars are a reliable and cost-effective choice for automotive manufacturers, making them a popular material for use in the industry.

Q: Can steel round bars be used in the packaging industry?: Certainly! Steel round bars have a wide range of applications in the packaging industry. More specifically, they are commonly utilized to add structural support and enhance the strength of various packaging materials. These bars can function as reinforcement bars or support rods in packaging crates, pallets, and containers. Notably, steel round bars are renowned for their exceptional strength and durability, which makes them well-suited to withstand heavy loads and maintain the integrity of the packaging materials during transportation and storage. Furthermore, steel round bars can be easily customized and cut to the desired length, allowing for flexibility in packaging design and meeting specific requirements. In summary, incorporating steel round bars in the packaging industry greatly enhances the safety, stability, and safeguarding of packaged products.

Q: What is hot rolling? What is called forging?: And there is no essential difference between the rolling and forging are relying on the plastic deformation of the blank but only the blank rolling machine plates or other similar things can be put in the sheet metal forging blank is processed into a more complex shape

Q: Can steel round bars be used in the manufacturing of valves?: Valves can indeed be manufactured using steel round bars. The utilization of steel round bars in valve production is widespread owing to their remarkable attributes of strength, durability, and resistance to corrosion. These round bars can be skillfully machined and forged into diverse valve components, including stems, bodies, and discs. Furthermore, steel round bars offer exceptional mechanical properties, thereby guaranteeing the ability of valves to endure extreme pressure and temperature conditions. Another advantage is that steel round bars can be effortlessly welded or threaded to connect different valve parts. In conclusion, steel round bars emerge as a dependable and highly favored material option for the manufacturing of valves.

Q: Can steel round bars be used in the manufacturing of tools and equipment?: Yes, steel round bars can be used in the manufacturing of tools and equipment. Steel is a popular material choice for tool and equipment manufacturing due to its excellent strength, durability, and versatility. Steel round bars can be easily shaped, cut, and formed into various tool components such as shafts, handles, and blades. Additionally, steel's high tensile strength and resistance to wear and tear make it suitable for heavy-duty applications. It can withstand the forces and stress involved in tool usage, ensuring a long lifespan and reliable performance. Furthermore, steel's ability to be heat-treated and hardened allows for the creation of tools with enhanced hardness and toughness, making them more effective in cutting, shaping, or gripping tasks. Overall, steel round bars are a popular and widely used material in the manufacturing of tools and equipment due to their strength, durability, and versatility.

Q: How do you cut steel round bars?: To cut steel round bars, one can utilize various methods based on specific requirements and available tools. Here are a few commonly employed techniques: 1. Abrasive Cutting: By using a handheld angle grinder or chop saw equipped with an abrasive cutting wheel or disc, a groove is created on the surface of the round bar. Applying pressure and rotating the bar gradually allows the cutting wheel to slice through the steel. 2. Cold Saw: This specialized machine operates with a circular blade at a low speed, minimizing heat generation. The round bar is firmly clamped, and the cold saw's blade is lowered onto it to achieve precise cuts. 3. Band Saw: Another commonly used machine for steel round bar cutting, the band saw features a rotating toothed metal band that moves on two pulleys. The round bar is secured in a vise, and the band saw is adjusted to the desired angle and speed. The bar is then fed into the blade, resulting in smooth cuts. 4. Torch Cutting: For thicker steel round bars, oxy-fuel torch cutting is suitable. This method involves using a torch that combines oxygen and fuel gas, like acetylene, to produce a high-temperature flame. The round bar is heated until it becomes molten, and then a separate stream of oxygen is directed onto the heated area, causing rapid oxidation and enabling a cut. Irrespective of the chosen method, it is crucial to adhere to proper safety measures, including wearing protective goggles and gloves, and ensuring a stable work surface. Furthermore, using the appropriate cutting tools and techniques for the specific type of steel being cut is vital to achieve clean and precise results.

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