High grade hot rolled round steel
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Round steel refers to the solid section for circular strip steel. Its specifications expressed as a number of mm in diameter, such as "50" indicates that the diameter of 50 mm round steel.
The material of round steel, Q195, Q235, 10 #, 20 #, 35 #, 45 #, Q215, Q235, 304, 316, 40 cr, cr, 20 crmo, 35 crmo, 42 crmo, 40 crnimo, GCr15, 65 mn, 50 mn, cr, 3 cr2w8v, 20 crmnti, 5 crmnmo, etc.
Round steel hot rolling, forging and cold drawn three kinds. The specifications of the hot rolled round steel of 5.5 to 250 mm. Among them: 5.5-25 mm small round steel are mostly with straight bundles of supplies, commonly used for reinforcing steel bar, bolt, and various mechanical parts; More than 25 mm round steel, mainly used in the manufacture of machinery parts and seamless steel tube. The difference between the round steel and other steel: 1 appearance is not the same, round steel exterior circle of light, no lines without ribs, and other steel surface appearance has a groove or a rib, thus causing the cohesive force of small round steel and concrete, and the other the cohesive force of steel bar and reinforced concrete. 2 ingredients are different, round steel (level 1) steel belong to the normal low carbon steel, more than other reinforcement for alloy steel. Three different intensity, low intensity of round steel and other steel with high intensity, the diameter of the same size of round steel compared with other steel bar, round steel can withstand strength than other bar is small, but the plastic is better than other steel round steel, the round steel before is pulled with large deformation, and other steel before be pulled deformation is much smaller.
classification
The editor
1. According to the chemical classification
Carbon steel according to the chemical composition (i.e., with carbon content) can be divided into low carbon steel, medium carbon steel and high carbon steel.
(1) low carbon steel
Also known as mild steel, carbon content from 0.10% to 0.30% of low carbon steel is easy to accept all kinds of processing such as forging, welding and cutting, often used in the production chain, rivet, bolts, shaft, etc.
(2) the medium carbon steel
Carbon is 0.25% ~ 0.60% of the carbon steel. Have a calming, half killed steel, steel and other steel products. In addition to the carbon can also contain a small amount of manganese (0.70% ~ 1.20%). According to the quality of the products are divided into ordinary carbon structural steel and high quality carbon structural steel. Hot working and cutting performance is good, poor welding performance. Strength and hardness is higher than low carbon steel and the plasticity and toughness lower than that of low carbon steel. Without heat treatment, direct use of hot rolled, cold drawn material, can be used after heat treatment. The medium carbon steel after quenching and tempering has good comprehensive mechanical properties. To achieve the highest hardness about HRC55 (HB538), sigma b for 600 ~ 600 mpa. So in a moderate level of a variety of purposes, medium carbon steel is the most widely used, except as building materials, also used in the manufacture of various kinds of machinery parts.
(3) the high carbon steel
Often called tool steel, carbon content from 0.60% to 1.70%, can be hardening and tempering. Hammer, crowbar, etc by the carbon content of 0.75% steel manufacturing; Cutting tools such as drill, tap, reamer, etc by between 0.90% and 1.00% of the carbon content of steel manufacturing.
2. According to the quality of the steel
According to the quality of the steel can be divided into ordinary carbon steel and high quality carbon steel.
(1) ordinary carbon structural steel, also known as ordinary carbon steel, the carbon content, performance range, and phosphorus, sulfur and other residual elements content is relatively wide. In China and some countries according to the guarantee of delivery condition is divided into three categories: class A steel steel (class A) is to ensure that the mechanical properties of steel. B steel steel (class B) is the guarantee of the chemical composition of the steel. Special type of steel (class C) steel is both ensure the mechanical properties and guarantee the chemical composition of steel, often used in the manufacture of the important structures. China is now the production and use of the most is around 0.20% of A3 carbon steel (steel) a class 3, mainly used in engineering structure.
Some carbon structural steel and adding trace amounts of aluminum or niobium (or other) carbide forming elements to form nitrides or carbide particles, to limit the grain growth, make the steel reinforcement, save steel. In China and some countries, in order to adapt to the special requirements of professional steel, the chemical composition and properties of ordinary carbon structural steel, so as to develop a series of ordinary carbon structural steel major steel, such as Bridges, buildings, pressure vessel steel, steel, etc.).
(2) high quality carbon structural steel and ordinary carbon structural steel, sulfur, phosphorus and other non-metallic inclusion content is low. According to carbon content and purpose is different, this kind of steel is roughly divided into three categories: (1) is less than 0.25% C for low carbon steel, notably the carbon less than 0.10% of the 08 f, 08 al and so on, because has the very good deep-drawing property and weldability and is widely used for deep drawing parts such as automobile, can... And so on. The main material of 20 g is making ordinary boiler. In addition, low carbon steel as carburizing steel, widely used in mechanical manufacturing industry. (2) 0.25 ~ 0.60% C for medium carbon steel, used in the quenched and tempered state more, make parts of machinery manufacturing industry. (3) greater than 0.6% C for high carbon steel, used in the manufacture of springs, gears, roll, etc. According to different manganese content, and can be divided into ordinary manganese content (0.25 ~ 0.8%) and high manganese content (0.7 ~ 1.0% and 0.9 ~ 1.2%) steel group. Manganese can improve the hardenability of steel, strengthen the ferrite, improve the steel yield strength, tensile strength and abrasion resistance. Usually in the high manganese steel grades after additional tags "Mn", such as 15 Mn, 20 Mn to distinguish it from normal carbon steel containing manganese content.
3. According to the classification purpose
According to the purposes and can be divided into carbon structural steel, carbon tool steel.
Carbon tool steel carbon content between 0.65 ~ 1.35%, high hardness and high wear resistance can be obtained after heat treatment, mainly used in the manufacture of various tools and cutters, mould and measuring tool (see tool steel).
Carbon structural steel in accordance with the steel yield strength is divided into five grades:
Q195, Q215, Q235, Q255, Q275
Each brand due to different quality is divided into A, B, C, D level, there are four most, some only one; In addition, a steel smelting deoxidizing method.
Deoxidizing method symbols:
F - rimmed steel
B - half killed steel
Z - killed steel
TZ - special killed steel
- Q:Can steel round bars be used in the production of power tools?
- Yes, steel round bars can be used in the production of power tools. Steel is a durable and strong material that is commonly used in the manufacturing of various tools and machinery, including power tools. Steel round bars can be used to create the body, handles, and other components of power tools, providing stability, strength, and longevity. The steel used in power tools is often selected for its high tensile strength and resistance to wear and tear. Additionally, steel can be easily machined, allowing for precise shaping and customization of power tool components. Overall, steel round bars are a suitable choice for the production of power tools due to their strength, durability, and versatility.
- Q:How many meters is the minimum loading surface of galvanized steel wire for grounding grid?
- Round steel (grade 1 steel) belongs to ordinary low carbon steel with low strength. However, the plasticity of the round bar is stronger, that is, the round steel has a larger deformation before it is pulled off.It has been widely used in the fields of hardware, construction, automobile, shipbuilding, petrochemical, machinery, medicine, food, electricity, energy, space, etc.. The most extensive machining of general machine parts, general rod type steel parts, CD pole, bolt, nut.
- Q:How do you check the quality of a steel round bar?
- To check the quality of a steel round bar, several factors need to be considered. Firstly, it is important to assess the bar's dimensions. This involves measuring its diameter, length, and straightness. Any deviation from the specified dimensions could indicate a lower quality bar. Next, the surface condition of the steel round bar should be inspected. It should be free from any visible defects, such as cracks, pits, or surface irregularities. Additionally, the bar's surface should be smooth and devoid of any significant roughness or burrs. Furthermore, the chemical composition of the steel round bar must be examined. This can be determined through spectroscopic analysis or other testing methods. The composition should meet the required standards and specifications, as any deviations can affect the bar's strength and durability. Another crucial aspect to consider is the mechanical properties of the steel round bar. This involves testing its tensile strength, yield strength, and elongation. These tests can be conducted using specialized machines to ensure that the bar meets the necessary strength requirements. Additionally, the steel round bar can be subjected to non-destructive testing methods, such as ultrasonic testing or magnetic particle inspection. These techniques help identify any internal or surface defects that may impact the bar's quality. Furthermore, it is essential to verify the bar's compliance with industry standards and certifications. This includes checking if the steel round bar meets the specifications set by organizations such as ASTM International or ISO. Lastly, it is advisable to consult with reputable suppliers or manufacturers who have a proven track record in producing high-quality steel round bars. They can provide documentation, certifications, and test reports to validate the quality of their products. In summary, evaluating the dimensions, surface condition, chemical composition, mechanical properties, compliance with standards, and supplier's reputation are key steps to check the quality of a steel round bar. By thoroughly examining these factors, one can ensure the reliability and performance of the steel round bar for their intended applications.
- Q:What are the different types of steel used in manufacturing round bars?
- Round bars in manufacturing can be made from various types of steel. The most commonly used types include: 1. Carbon Steel: This is the go-to steel for manufacturing round bars due to its strength and durability. It mainly consists of iron and carbon and finds application in construction, automotive, and machinery. 2. Alloy Steel: By adding elements like manganese, nickel, chromium, and molybdenum to carbon steel, alloy steel is formed. This enhances its strength and hardness, making it suitable for applications that demand high strength and resistance to wear and tear. 3. Stainless Steel: A type of alloy steel, stainless steel contains a minimum of 10.5% chromium. This high chromium content gives it excellent corrosion resistance, making it ideal for applications exposed to moisture or chemicals. Stainless steel round bars are commonly used in kitchen utensils, medical equipment, and automotive parts manufacturing. 4. Tool Steel: Tool steel is an alloy steel designed specifically for high hardness, wear resistance, and heat resistance. It is commonly used in manufacturing cutting tools, dies, and molds. Tool steel round bars are usually made from high-carbon steel with additional elements like tungsten, vanadium, or cobalt. 5. Bearing Steel: Bearing steel is an alloy steel specifically formulated for bearing applications. It is characterized by its high hardness, wear resistance, and fatigue strength. Bearing steel round bars are widely used in bearing manufacturing for industries like automotive, aerospace, and industrial machinery. These examples demonstrate the range of steel types available for manufacturing round bars. The specific choice of steel depends on the desired properties and requirements of the application at hand.
- Q:What are the different surface defects that can be found in steel round bars?
- Some common surface defects that can be found in steel round bars include scratches, pits, cracks, scale, and decarburization.
- Q:Can steel round bars be used in the production of flanges?
- Yes, steel round bars can be used in the production of flanges. Round bars made of steel are commonly used as raw materials in the manufacturing process of flanges. These round bars are often machined, forged, or rolled into the desired flange shape. Steel round bars offer several advantages in the production of flanges, including high strength, durability, and resistance to corrosion. They can be easily fabricated and machined to meet specific size and dimensional requirements. Steel round bars are widely utilized in various industries, such as oil and gas, petrochemical, power generation, and construction, for producing flanges that are used in piping systems to connect pipes or equipment.
- Q:What are the advantages of using tool steel round bars?
- There are several advantages to using tool steel round bars. Firstly, tool steel round bars offer exceptional hardness and wear resistance. This makes them ideal for applications where the material needs to withstand high levels of stress, such as in the manufacturing of cutting tools, dies, and molds. The hardness of tool steel also allows for precise machining, resulting in accurate and intricate shapes. Secondly, tool steel round bars have excellent toughness and impact resistance. This means that they can withstand heavy-duty applications without breaking or cracking. This makes them suitable for use in demanding industries such as aerospace, automotive, and construction. Furthermore, tool steel round bars are known for their high temperature resistance. They can maintain their hardness and strength even under extreme heat conditions. This feature is particularly advantageous in applications where the material is exposed to high temperatures, such as in forging or heat treating operations. Another advantage of using tool steel round bars is their dimensional stability. They have a low coefficient of thermal expansion, meaning they do not undergo significant dimensional changes when exposed to temperature variations. This makes them highly reliable and predictable in various operating conditions. Moreover, tool steel round bars can be easily machined and heat treated to achieve specific properties. This versatility allows manufacturers to tailor the material to their specific needs, enhancing the overall performance of the end product. Lastly, tool steel round bars are readily available and cost-effective. They are widely produced and stocked by suppliers, making them easily accessible for various applications. Additionally, their long lifespan and resistance to wear and tear contribute to their cost-effectiveness. In conclusion, the advantages of using tool steel round bars include exceptional hardness, toughness, high temperature resistance, dimensional stability, versatility, availability, and cost-effectiveness. These properties make them a preferred choice in industries where durability, precision, and reliability are crucial.
- Q:What is the difference between seamless and welded steel round bars?
- The manufacturing process and resulting characteristics distinguish seamless and welded steel round bars. Seamless bars undergo a process where a solid billet of steel is pierced to form a hollow tube. This tube is then elongated and further processed to achieve the desired dimensions and surface finish. The seamless manufacturing process guarantees a bar without any welds or joints along its length. Consequently, seamless steel round bars possess a uniform composition and structure throughout, ensuring exceptional strength and reliability. They are particularly favored for applications involving high pressure or high temperatures, as they display superior resistance to internal and external pressure. In contrast, welded steel round bars are produced by combining two or more steel pieces through welding techniques. This involves heating the ends of the steel pieces and fusing them together using various welding methods, such as arc welding, resistance welding, or fusion welding. The welding process introduces a weld seam along the length of the bar, which has the potential to impact its structural integrity and mechanical properties. Welded steel round bars may exhibit slightly lower strength and toughness compared to seamless bars due to the presence of the weld seam, which can create stress concentrations. Nonetheless, they are generally more cost-effective and readily available in a wide range of sizes and grades. To summarize, the primary distinction between seamless and welded steel round bars lies in their manufacturing process and resulting characteristics. Seamless bars are created through the piercing of a solid billet, ensuring a uniform composition and strength throughout, which makes them suitable for high-pressure and high-temperature applications. On the other hand, welded bars are formed by joining multiple steel pieces through welding, introducing a weld seam that may slightly affect their strength and toughness. Welded bars are often more cost-effective and available in various sizes and grades.
- Q:What are the different types of surface defects in steel round bars?
- Steel round bars can have different types of surface defects, which can vary in severity and affect the quality and performance of the bars. Common surface defects include: 1. Scale: During manufacturing, an oxide layer called scale can form on the surface of the steel. Scale appears as a rough, flaky layer and negatively affects the bar's appearance and surface finish. 2. Pits: Small depressions or cavities can occur on the bar's surface due to corrosion, mechanical damage, or manufacturing defects. Pits weaken the bar's structural integrity and increase the risk of failure. 3. Scratches: Shallow grooves or marks can be caused by handling, transportation, or contact with other objects during manufacturing. While scratches may not significantly impact the bar's strength, they do affect its appearance and surface finish. 4. Cracks: Linear fractures on the bar's surface can result from excessive stress, thermal cycling, or manufacturing defects. Cracks are extremely harmful to the bar's strength and integrity and can lead to catastrophic failure if not addressed. 5. Decarburization: Loss of carbon from the steel bar's surface layer, which can occur during heating or cooling processes. This process results in a softer and weaker surface layer, reducing the bar's overall strength and durability. 6. Lamination: Separation or delamination of layers within the steel bar, caused by improper bonding or rolling conditions during manufacturing. Lamination weakens the bar's structural integrity and increases the likelihood of failure. 7. Inclusions: Non-metallic particles or impurities present on the bar's surface, caused by contaminants in raw materials or improper manufacturing processes. Inclusions negatively impact the bar's mechanical properties and performance. To ensure the quality and performance of steel round bars, it is crucial to identify and address these surface defects. Various inspection and testing methods can be used, such as visual inspection, ultrasonic testing, magnetic particle inspection, and dye penetrant inspection.
- Q:What are the different tolerances for steel round bars?
- Steel round bars have a range of tolerances that are determined by the specific requirements and standards of different industries and applications. These tolerances ensure that the dimensions and surface conditions of the bars meet the desired specifications. The diameter tolerance is the most common tolerance for steel round bars. It refers to the allowable deviation from the specified diameter. For example, a steel round bar with a diameter tolerance of +/- 0.005 inches means that the actual diameter can vary within this range. Another important tolerance is the straightness tolerance, which measures the allowable deviation from a straight line over a specified length of the bar. Straightness tolerances are usually expressed as the maximum deviation in relation to the length, such as 0.010 inches per foot. Surface finish tolerance is also crucial and refers to the acceptable variation in the surface texture or roughness of the bar. This tolerance is often specified using parameters like Ra or Rz. For instance, a surface finish tolerance of Ra 0.8 micrometers means that the average roughness should not exceed this value. In addition to these common tolerances, there may be other specific tolerances based on the intended application of the steel round bars. These can include tolerances for straightness, length, weight, or other dimensional properties. It's important to note that the tolerances for steel round bars can vary depending on the standards followed by different industries and countries. To determine the specific tolerances required for a particular application, it's advisable to refer to the relevant standards or specifications.
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High grade hot rolled round steel
- Loading Port:
- China Main Port
- Payment Terms:
- TT OR LC
- Min Order Qty:
- -
- Supply Capability:
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