5mm to 100mm round steel bar for construction
- Ref Price:
-
- Loading Port:
- Tianjin
- Payment Terms:
- TT OR LC
- Min Order Qty:
- 25000 m.t.
- Supply Capability:
- 10000 m.t./month
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Specifications of Steel Round Bar:
1. Standard: GB
2. Grade: Q345
3. Invoicing on theoretical weight or actual weight as customer’s request
4. Shape: Round bar, solid bar of steel with circular section
5. Technique: Hot rolled
Packaging & Delivery of Steel Round Bar:
Packaging Detail: Standard seaworthy packing or as customer required; all goods are packed in bundle with steel strips and shipped by break bulk vessel or container
Delivery Detail: 45 days
Trade terms: FOB, CFR, CIF or as customer required
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.
Documents given: Full set (3/3) of original clean on board bill of lading; Original signed commercial invoice, in 3 originals and 3 copies; Original packing list in 3 originals and 3 copies; Policy of insurance; Certificate of origin and what the target market needs.
Specification of Spring Steel:
-Material: 70Si2CrA
-Production: Hot rolled or cold rolled
-Standard: GB/T·5218-1999
-Type: Spring Steel
-Alloy or no: Alloy
Chemical Composition:
C | Mn | Si | Cr |
0.65~0.75 | 0.40~0.60 | 1.40~1.70 | 0.20~0.40 |
S | P | Ni | |
≤0.030 | ≤0.030 | ≤0.030 |
Mechanical Properties:
-Annealing Condition:
1, Tensile Strength: σb/MPa：≤835
2, Elongation: δ/%：≥8
-Quencher condition:
1, Tensile strength: σb/MPa：785~1175
2, Elongation: -
- Q: What is the difference between hot working and cold working of steel round bars?
- Steel round bars can be shaped and manipulated using two different methods: hot working and cold working. Hot working involves shaping steel at high temperatures, typically above the steel's recrystallization temperature. This makes the material more malleable and easier to shape. The processes involved in hot working include forging, rolling, and extrusion. Hot working has several advantages. It allows for the creation of complex shapes and sizes with minimal force or energy. It also improves the mechanical properties of the steel, such as strength and toughness, by refining its grain structure. However, hot working can cause oxidation and scale formation on the steel's surface, which may require additional treatments or cleaning. On the other hand, cold working refers to shaping steel at room temperature or below its recrystallization temperature. Cold working processes include bending, drawing, and cold rolling. Unlike hot working, cold working does not require heating the steel, which reduces energy consumption and production costs. It also results in a smoother surface finish and tighter tolerances compared to hot working. Cold working can increase the hardness and strength of the steel, making it suitable for applications that require higher mechanical properties. However, it can also make the steel more brittle and prone to cracking. In conclusion, the main difference between hot working and cold working steel round bars lies in the temperature at which the shaping process takes place. Hot working is done at high temperatures, making shaping easier and improving mechanical properties. Cold working, on the other hand, is done at room temperature or below, resulting in tighter tolerances and increased hardness. The choice between hot working and cold working depends on the desired properties and characteristics of the final product.
- Q: What are the typical hardness values for different grades of steel round bars?
- The typical hardness values for different grades of steel round bars can vary depending on the specific grade and manufacturing process. However, common ranges for hardness values in steel round bars can be between 200 and 400 on the Brinell hardness scale.
- Q: What is the maximum manganese content allowed for steel round bars?
- The maximum manganese content allowed for steel round bars typically varies depending on the specific grade or specification of the steel. However, in general, most steel round bars have a maximum manganese content of around 1-1.5%.
- Q: How do you prevent warping during welding of steel round bars?
- To prevent warping during welding of steel round bars, several measures can be taken. Firstly, it is crucial to ensure proper fit-up and alignment of the bars before welding, as any misalignment can lead to distortion. Secondly, using an appropriate welding technique, such as back-stepping or stitch welding, can help distribute heat evenly and minimize warping. Additionally, controlling the heat input and avoiding excessive heat buildup by using intermittent welding or preheating can also prevent distortion. Lastly, the use of clamps, fixtures, or tack welds to secure the bars in place during welding can provide stability and reduce the chances of warping.
- Q: How do steel round bars perform under static or stationary loads?
- Steel round bars perform exceptionally well under static or stationary loads. Due to their high tensile and compressive strength, they can withstand heavy loads without significant deformation or failure. The structural integrity and stability of steel round bars make them a reliable choice for various applications where static or stationary loads are involved.
- Q: What are the factors to consider when selecting a steel round bar?
- There are several factors to take into account when choosing a steel round bar. Firstly, it is crucial to evaluate the grade of steel. Each grade has different properties and strengths, so it is important to consider the specific application and requirements. For instance, if high corrosion resistance is needed, stainless steel grades such as 304 or 316 may be appropriate, while carbon steel grades like A36 or 1018 may be more suitable for structural purposes. Secondly, the dimensions and size of the round bar should be considered. This includes the diameter, length, and tolerance requirements. The size should be chosen based on the specific application, load-bearing capacity, and available installation space. Thirdly, the condition and surface finish of the round bar should be assessed. This includes factors like surface roughness, straightness, and any surface defects. The surface finish should be selected based on the desired aesthetics, functional requirements, and manufacturing process. Another important aspect is the availability and cost of the steel round bar. It is crucial to consider the availability of the desired grade and size from suppliers, as well as the associated cost. Comparing prices from different suppliers is advisable to ensure the best value for money. Furthermore, it is necessary to evaluate the required mechanical properties of the steel round bar. This includes factors like tensile strength, yield strength, hardness, and ductility. The mechanical properties should align with the intended application and load-bearing requirements. Lastly, any additional requirements or certifications should be considered. This could include compliance with specific industry standards (e.g., ASTM, ISO), certifications (e.g., RoHS, REACH), or specific testing requirements (e.g., ultrasonic testing, impact testing). In conclusion, selecting a steel round bar involves considering the grade, dimensions, surface finish, availability, cost, mechanical properties, and any additional requirements. Taking these factors into account will ensure that the chosen steel round bar is suitable for the intended application and meets all necessary specifications.
- Q: Can steel round bars be used in high-temperature environments?
- Yes, steel round bars can be used in high-temperature environments. However, the specific type of steel and its composition need to be carefully chosen to ensure it has the necessary heat resistance properties, such as high melting point and good strength retention at elevated temperatures.
- Q: How can steel round bars be protected from corrosion?
- There are various methods available for protecting steel round bars from corrosion. One common approach involves the application of a protective coating, such as paint or enamel. This coating acts as a barrier between the steel and the corrosive elements present in the environment, thereby minimizing the risk of corrosion. Another effective technique is the use of galvanization, which entails coating the steel round bars with a layer of zinc. Zinc, being a sacrificial metal, tends to corrode more readily than steel. Consequently, when the round bars come into contact with moisture or other corrosive substances, the zinc coating corrodes instead of the steel, providing an extra layer of protection. The utilization of stainless steel round bars is also highly effective in preventing corrosion. Stainless steel contains a significant amount of chromium, which forms a passive layer on the steel's surface. This passive layer acts as a shield, safeguarding the steel against corrosion caused by moisture or other corrosive agents. Regular maintenance and cleaning of the steel round bars are essential for preventing corrosion. Removing dirt, dust, and other contaminants from the surface helps to preserve the protective coating or passive layer if it exists. Additionally, keeping the round bars dry and storing them in a well-ventilated area can also aid in corrosion prevention. Proper handling and storage of steel round bars are equally important. Storing them in a dry and covered location prevents exposure to moisture and corrosive elements. It is also crucial to avoid contact with other metals or materials that can induce galvanic corrosion. By implementing these protective measures, steel round bars can be effectively shielded from corrosion, ensuring their longevity and structural integrity.
- Q: Can steel round bars be used for making electrical components?
- No, steel round bars are not typically used for making electrical components. Electrical components are typically made from materials that have good electrical conductivity, such as copper or aluminum.
- Q: How do you calculate the moment of inertia of a steel round bar?
- In order to determine the moment of inertia for a steel round bar, one must possess knowledge of the bar's dimensions and properties. The moment of inertia serves as a gauge for an object's resistance to rotational changes. The formula utilized to compute the moment of inertia for a solid cylindrical item, such as a round bar, is as follows: I = (π/4) * D^4, where I signifies the moment of inertia and D symbolizes the bar's diameter. Initially, ascertain the diameter of the steel round bar by means of a caliper or ruler. It is essential to measure the diameter at its broadest point, typically found at the center. Subsequently, input the measured diameter into the formula and calculate the moment of inertia. It is crucial to use the correct units for diameter, such as inches or millimeters, to maintain consistency with the formula. For instance, let's assume the diameter of the steel round bar measures 2 inches. By substituting this value into the formula: I = (π/4) * (2 inches)^4 = (π/4) * 16 inches^4 = 4π inches^4. Therefore, the moment of inertia for the steel round bar with a diameter of 2 inches equals 4π inches^4. It is imperative to recognize that this formula assumes a solid cylindrical shape devoid of any alterations in diameter or hollow sections. If the round bar presents variations in diameter or is hollow, the moment of inertia calculation becomes more intricate and necessitates additional considerations.
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5mm to 100mm round steel bar for construction
- Ref Price:
-
- Loading Port:
- Tianjin
- Payment Terms:
- TT OR LC
- Min Order Qty:
- 25000 m.t.
- Supply Capability:
- 10000 m.t./month
OKorder Service Pledge
Quality Product, Order Online Tracking, Timely Delivery
OKorder Financial Service
Credit Rating, Credit Services, Credit Purchasing
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