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: What are the advantages of using nickel-chromium-molybdenum alloy steel round bars?: There are several advantages of using nickel-chromium-molybdenum alloy steel round bars: 1. High strength and durability: Nickel-chromium-molybdenum alloy steel round bars have excellent mechanical properties, including high tensile strength and hardness. This makes them ideal for applications that require a strong and durable material. 2. Corrosion resistance: The addition of nickel and chromium in the alloy steel composition enhances its resistance to corrosion, making it suitable for use in environments where exposure to harsh chemicals or moisture is a concern. This corrosion resistance extends the lifespan of the round bars and reduces the need for frequent replacements. 3. Heat resistance: Nickel-chromium-molybdenum alloy steel round bars can withstand high temperatures without losing their structural integrity. This makes them suitable for applications that involve exposure to extreme heat, such as in the manufacturing of boilers, heat exchangers, and other heat-resistant equipment. 4. Versatility: The nickel-chromium-molybdenum alloy steel round bars can be easily machined and fabricated, allowing for various shapes and sizes to be produced. This versatility makes them suitable for a wide range of applications in industries such as aerospace, automotive, oil and gas, and construction. 5. Fatigue resistance: The alloy composition of nickel-chromium-molybdenum steel enhances its fatigue resistance, making it suitable for applications subjected to cyclic loading or repeated stress. This property ensures that the round bars can withstand prolonged use without experiencing fatigue failure. 6. Weldability: Nickel-chromium-molybdenum alloy steel round bars have good weldability, allowing for easy joining or fabrication processes. This makes them suitable for applications that require welding or other forms of joining, providing flexibility in design and construction. Overall, the advantages of using nickel-chromium-molybdenum alloy steel round bars make them a preferred choice in various industries where strength, durability, corrosion resistance, heat resistance, versatility, fatigue resistance, and weldability are crucial factors for success.

Q: What are the different mechanical properties of steel round bars?: The different mechanical properties of steel round bars include tensile strength, yield strength, elongation, hardness, and impact resistance. Tensile strength refers to the maximum amount of stress a material can withstand before breaking. Yield strength is the stress at which a material begins to deform permanently. Elongation measures the amount of deformation a material can undergo before breaking. Hardness determines the material's resistance to indentation or scratching. Impact resistance is the ability of a material to absorb energy during sudden impacts without breaking.

Q: Are steel round bars prone to deformation?: When steel round bars are manufactured and used correctly, they usually do not deform. Steel is recognized for its strong tensile strength and durability, which means it can resist bending or warping in normal situations. However, it is essential to remember that excessive force or mishandling can still lead to deformation in steel round bars. Overloading, improper storage, or using inappropriate machining techniques can all contribute to the bars bending or twisting. Hence, it is vital to adhere to recommended guidelines and industry standards to guarantee the durability and longevity of steel round bars.

Q: Are steel round bars suitable for high-stress applications?: Yes, steel round bars are suitable for high-stress applications. Steel is known for its strength and durability, making it an ideal material for high-stress environments. Round bars, in particular, offer excellent tensile strength and can withstand heavy loads and intense pressure. They are commonly used in industries such as construction, manufacturing, and engineering, where high-stress applications require a reliable and robust material. The round shape of the bars also provides uniformity in strength, ensuring consistent performance under extreme conditions. Additionally, steel round bars can be heat-treated to further enhance their mechanical properties, making them even more suitable for high-stress applications. Overall, steel round bars are a reliable and effective choice for demanding environments that require exceptional strength and resilience.

Q: What is the difference between a hot rolled and a turned steel round bar?: A hot rolled steel round bar is produced by heating the steel billet to high temperatures and then rolling it into its final shape, resulting in a rough surface finish. On the other hand, a turned steel round bar is produced by machining the steel bar using a lathe, which creates a smooth and polished surface finish.

Q: What is the elasticity of a steel round bar?: The elasticity of a steel round bar refers to its ability to return to its original shape and size after being subjected to external forces or deformations. Steel is known for its high elastic modulus, which means it has a high resistance to deformation and can withstand substantial stress before permanently bending or breaking. The elasticity of a steel round bar is determined by its composition, specifically the carbon content and the presence of other alloying elements. Steel with higher carbon content is generally more elastic and can be more easily manipulated without permanent deformation. However, it is important to note that the elasticity of a steel round bar can also be affected by factors such as temperature, strain rate, and the presence of any defects or imperfections in the material.

Q: Can steel round bars be heat treated to enhance their properties?: Steel round bars can undergo heat treatment to improve their properties. This process involves controlled heating and cooling to modify the microstructure of the steel, ultimately enhancing its mechanical properties like strength, hardness, toughness, and ductility. Various heat treatment methods can be employed based on the desired outcome. One commonly used method is quenching and tempering. This involves heating the steel to high temperatures, forming a uniform austenitic structure, then rapidly cooling it in oil or water to transform the austenite into a stronger structure called martensite. However, martensite can be brittle, so the steel is subsequently tempered by reheating it at lower temperatures to reduce brittleness while maintaining the desired hardness. Another method is annealing, where the steel is heated to a specific temperature and slowly cooled to relieve internal stresses and enhance ductility. This process also refines the grain structure of the steel, improving machinability and formability. Furthermore, there are other heat treatment methods like normalizing, stress relieving, and case hardening, each tailored to enhance specific properties of steel round bars. Overall, heat treatment is a versatile and effective technique for enhancing the properties of steel round bars, enabling them to meet specific requirements in industries such as manufacturing, construction, automotive, and aerospace.

Q: The difference between round steel and screw steel: The difference between round bar and round bar is that the surface has longitudinal ribs and transverse ribs, usually with two longitudinal ribs and transverse ribs uniformly distributed along the length direction. The rebar is a kind of small section steel, mainly used for the skeleton of reinforced concrete construction members. In use, some mechanical strength, bending deformation property and welding performance are required. The raw steel billet for the production of threaded steel is carbon structural steel or low alloy structural steel which is treated by calm melting, and the finished steel bar is delivered in hot rolling forming, normalizing or hot rolling state.

Q: What are the different types of steel round bar surface treatments used in the automotive industry?: In the automotive industry, there are several types of steel round bar surface treatments used to enhance the performance, durability, and aesthetics of the components. Some of the common surface treatments include: 1. Phosphating: Phosphating is a widely used surface treatment that involves applying a phosphate coating on the steel round bar. This treatment enhances corrosion resistance and provides a good base for further coatings or paints. 2. Galvanizing: Galvanizing involves applying a layer of zinc to the steel round bar's surface. This treatment provides excellent corrosion resistance and enhances the lifespan of the component. 3. Electroplating: Electroplating is a process where a thin layer of metal, such as chrome or nickel, is deposited onto the steel round bar's surface using an electric current. This treatment improves the appearance, provides corrosion resistance, and enhances wear resistance. 4. Powder coating: Powder coating is a popular surface treatment method where a dry powder is applied to the steel round bar's surface and then heated to form a protective coating. This treatment provides excellent durability, corrosion resistance, and can be customized with various colors and finishes. 5. Anodizing: Anodizing is typically used for aluminum components in the automotive industry. However, it can also be applied to steel round bars in certain cases. This treatment involves creating an oxide layer on the surface, providing improved corrosion resistance and enhancing the appearance. 6. Black oxide coating: Black oxide coating is a chemical treatment that creates a blackened surface on the steel round bar. This treatment provides corrosion resistance, improved aesthetics, and can also act as a lubricant in certain applications. It is important to note that the choice of surface treatment depends on the specific requirements of the automotive component, including environmental conditions, desired appearance, and functional properties. Manufacturers carefully select the appropriate treatment to ensure optimal performance and longevity of the steel round bar in the automotive industry.

Q: Can steel round bars be coated for added protection?: Yes, steel round bars can be coated for added protection. Coating steel round bars helps to enhance their resistance against corrosion, wear and tear, and other environmental factors that may lead to deterioration or damage. There are various types of coatings available for steel round bars, such as hot-dip galvanizing, epoxy coating, powder coating, and zinc plating. These coatings provide a protective layer that acts as a barrier between the steel and the surrounding environment, preventing the steel from coming into direct contact with corrosive substances or abrasive elements. Coating steel round bars not only increases their longevity and durability but also improves their aesthetic appearance. Additionally, the choice of coating depends on the specific application, environment, and desired level of protection.

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