mild steel 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:Can steel round bars be used in the manufacturing of pumps?: Yes, steel round bars can be used in the manufacturing of pumps. Steel round bars are often used as the primary material for making pump shafts, impellers, and other critical components due to their high strength, durability, and resistance to corrosion. Their uniform shape and consistent mechanical properties make them suitable for creating precise and reliable pump parts.

Q:Are steel round bars suitable for the production of axles?: Indeed, axles can be produced using steel round bars. Steel, being a robust and long-lasting material, offers exceptional strength and stability, rendering it an optimal selection for axles. The circular form of these bars facilitates effortless machining and shaping processes, guaranteeing an accurate and efficient axle design. Moreover, steel round bars possess commendable resistance against wear, fatigue, and impact, indispensable attributes for axles that must endure demanding loads and harsh environments. All in all, steel round bars are a dependable and extensively employed material in diverse industries, including automotive, manufacturing, and construction, for axle production.

Q:What are the different types of steel round bars used in the automotive engine components?: There are several different types of steel round bars used in automotive engine components, each with their own specific properties and applications. 1. Carbon Steel Round Bars: These are the most common type of steel round bars used in automotive engine components. They are known for their high strength and durability, making them suitable for various applications such as crankshafts, connecting rods, and camshafts. Carbon steel round bars can withstand high levels of stress and are capable of withstanding extreme temperatures. 2. Alloy Steel Round Bars: Alloy steel round bars are made by adding different alloying elements such as chromium, nickel, and molybdenum to carbon steel. This enhances their strength, toughness, and wear resistance. Alloy steel round bars are commonly used in automotive engine components like gears, shafts, and bearings where high strength and resistance to wear and fatigue are required. 3. Stainless Steel Round Bars: Stainless steel round bars are highly corrosion-resistant and are often used in automotive engine components that come into contact with corrosive fluids or environments. They are commonly used in applications such as valves, pistons, and exhaust systems. 4. Tool Steel Round Bars: Tool steel round bars are characterized by their high hardness, resistance to abrasion, and excellent toughness. They are commonly used in automotive engine components that require cutting or shaping, such as cutting tools, dies, and punches. 5. High-Speed Steel Round Bars: High-speed steel round bars are designed to withstand high temperatures and maintain their hardness and cutting ability at high speeds. They are frequently used in automotive engine components like drills, milling cutters, and reamers. It's important to note that the specific type of steel round bar used in automotive engine components will depend on the specific application, performance requirements, and cost considerations. Automotive manufacturers carefully select the appropriate steel grade to ensure optimal performance and durability of engine components.

Q:Which is hard, round steel or screw steel?: Round bar is divided into three parts: hot rolling, forging and cold drawing. Standard Specification for hot rolled round steel is 5.5-250 mm. Of them: 5.5-25 mm small round bars are mostly supplied by straight strips. They are used as reinforcing bars, bolts and various mechanical parts. They are more than 25 millimeters of round steel. They are mainly used in the manufacture of mechanical parts or seamless steel tube billets

Q:How are steel round bars used in the manufacturing of machinery and equipment?: Steel round bars are commonly used in the manufacturing of machinery and equipment because of their high strength and durability. These bars are often machined, forged, or rolled to form various components such as shafts, gears, axles, and fasteners. Their uniform shape and consistent mechanical properties make them ideal for providing structural support, transferring power, and withstanding heavy loads in machinery and equipment. Additionally, steel round bars can be easily cut, welded, or heat treated to meet specific design requirements, making them versatile and essential in the manufacturing industry.

Q:What are the different types of carbon steel round bars?: There are several different types of carbon steel round bars, including low carbon steel, medium carbon steel, and high carbon steel. Each type has varying levels of carbon content, which determines its strength and hardness. Low carbon steel round bars have the lowest carbon content and are more easily welded and formed. Medium carbon steel round bars have a higher carbon content and are stronger and more durable, making them suitable for applications that require higher strength. High carbon steel round bars have the highest carbon content and are extremely strong and hard, making them ideal for applications that require maximum strength and wear resistance.

Q:Can steel round bars be machined?: Yes, steel round bars can be machined. Machining is a process that involves the removal of material from a workpiece to create the desired shape, size, or finish. Steel round bars are commonly machined to create various components, such as shafts, bolts, and fasteners. Machining processes such as turning, milling, drilling, and grinding can be used to shape and cut the steel round bars. However, the machinability of steel can vary depending on factors such as the composition and hardness of the steel, cutting tools, and machining parameters. It is important to use appropriate machining techniques and tools to ensure accurate and efficient results while machining steel round bars.

Q:What is the difference between a seamless and a welded steel round bar?: The manufacturing process and resulting structural integrity are what differentiate seamless and welded steel round bars. Seamless steel round bars are made by piercing a solid billet of steel and then rolling it into a round shape. This process ensures a smooth and continuous surface throughout the length of the bar, without any seams or welds. By eliminating the weld, potential weaknesses and vulnerabilities are also eliminated. Seamless steel bars have a more uniform composition and a higher strength-to-weight ratio due to the absence of welds. On the other hand, welded steel round bars are created by joining multiple pieces of steel together using various welding techniques. The steel pieces are heated and fused together at the edges to form a continuous bar. While welding provides flexibility in terms of length and diameter options, it can introduce structural concerns. Welded joints may have defects like porosity or inclusions, which can compromise the overall strength and integrity of the bar. However, advancements in welding technology and quality control have improved the reliability of welded steel round bars. Seamless steel round bars are preferred in critical industries like oil and gas, aerospace, and automotive sectors, where high strength, reliability, and resistance to corrosion are essential. On the other hand, welded steel round bars are commonly used in less demanding applications like construction, manufacturing, and general engineering, where cost-effectiveness and availability are more important. In conclusion, the manufacturing process and resulting structural characteristics are what set seamless and welded steel round bars apart. Seamless bars offer a smoother surface, higher strength-to-weight ratio, and greater resistance to defects, while welded bars are more cost-effective and readily available, though they may have weld-related vulnerabilities. The choice between the two depends on the specific requirements and priorities of the intended use.

Q:What is the maximum sulfur content allowed for steel round bars?: The allowed maximum sulfur content for steel round bars can vary depending on the specific grade and specification. Generally, the control of sulfur content in steel is essential to ensure the material's quality and good machinability. For most commercial grades of steel round bars, the maximum sulfur content is typically restricted to approximately 0.05% to 0.08%. Nevertheless, it is crucial to acknowledge that specific specialized grades or applications may possess distinct limits or requirements. It is advisable to refer to the appropriate standards or specifications for the specific grade of steel round bars to ascertain the maximum allowable sulfur content.

Q:What are the different grades of steel round bars available?: Steel round bars are available in various grades, each possessing unique properties and applications. Some commonly used grades include: 1. Mild Steel: This grade is the most affordable and widely used option. It contains a low carbon content, making it easy to weld, cut, and shape. Mild steel round bars are suitable for general construction, fabrication, and manufacturing projects. 2. Carbon Steel: Carbon steel round bars have a higher carbon content compared to mild steel, resulting in greater strength and hardness. They are commonly employed in applications requiring high strength, such as machinery parts, shafts, and axles. 3. Alloy Steel: To improve specific properties, alloying elements like chromium, nickel, manganese, or molybdenum are added to produce alloy steel round bars. These bars offer enhanced strength, toughness, and wear resistance, making them ideal for automotive parts, gears, and tools. 4. Stainless Steel: Stainless steel round bars are corrosion-resistant and possess excellent mechanical properties. They find extensive use in industries like construction, food processing, and medical equipment manufacturing. Different grades of stainless steel, such as 304, 316, or 410, offer varying levels of corrosion resistance and strength. 5. Tool Steel: Tool steel round bars are specifically designed for tool and die production. They exhibit high hardness, wear resistance, and heat resistance. Commonly utilized tool steel grades like D2, A2, or O1 are employed in the manufacture of cutting tools, molds, and dies. Choosing the appropriate grade of steel round bars for your project is crucial and should consider factors such as strength, corrosion resistance, hardness, and machinability. Seeking advice from a steel supplier or an engineer can assist in identifying the most suitable grade for your specific application.

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