Welded square rectangular tubes for structure
- Ref Price:
-
- Loading Port:
- Tianjin
- Payment Terms:
- TT or LC
- Min Order Qty:
- 17 m.t.
- Supply Capability:
- 13000 m.t./month
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1、 Welded square rectangular tubes for structure :
Square tube, square tube is a kind of call and rectangular tube, is equal and not equal to the length of steel pipe. Is the strip through the process of processing roll system. In general is the strip through the demolition of the package, flat, curly, welded to form a circular tube, and then rolled into a square tube and then cut into a square tube and then cut into the required length.
2、 Welded square rectangular tubes for structure
• Strong heat dissipation ability
• Good visual effect
• Reasonable price
• High manufacturing accuracy
• High strength
• Small inertia resistance
3、 Welded square rectangular tubes for structure ：
Standard | GB, DIN, ASTM |
Grade | 10#-45#, 16Mn 10#, 20#, 45#, 16Mn |
Thickness | 1.5 - 25 mm |
Section Shape | Square and rectangular |
Outer Diameter | 20*20 mm-------400*400mm 20*30mm*300*500mm |
Place of Origin | Tianjin, China (Mainland) |
Length | 3-12M |
Outer Diameter | 20*20 mm-------400*400mm 20*30mm*300*500mm |
Grade | 235B 345B |
Standard | ASME, ASTM |
1) Material:(ASTM A 106/A53 GRB.API5LGRB,GB,235B,345B
2) Specification range:OD: 20*30mm----300*500mm 20*20 mm---400*400mm ,WT: 1.5 - 25 mm ,length:3-12m or according to the requirement of clients.
3) Excutive standards:GB,ASME API5L.ASTM A 106/A53,Despite of the above
4) Surface:black lacquered,varnish coating or galvanized.
5) Ends:Beveled or square cut ,painted.
6) Packing:bundles wrapped with strong steel strip,seaworthy packing.
4、Packaging & Delivery
Packaging Details: | seaworthy package,bundles wrapped with strong steel strip |
Delivery Detail: | 15-30days after received 30%TT |
5、 Welded square rectangular tubes for structure
①How is the quality of your products?
Our products are manufactured strictly according to national and internaional standard, and we take a test
on every pipe before delivered out. If you want see our quality certifications and all kinds of testing report, please just ask us for it.
Guaranteed: If products’ quality don’t accord to discription as we give or the promise before you place order, we promise 100% refund.
②How about price?
Yes, we are factory and be able to give you lowest price below market one, and we have a policy that “ for saving time and absolutely honest business attitude, we quote as lowest as possible for any customer, and discount can be given according to quantity”,if you like bargain and factory price is not low enough as you think, just don’t waste your time.Please trust the quotation we would give you, it is professional one.
③Why should you chose us?
Chose happens because of quality, then price, We can give you both.Additionally, we can also offer professional products inquiry, products knowledge train(for agents), smooth goods delivery, exellent customer solution proposals.Our service formula: good quality+good price+good service=customer’s trust
SGS test is available, customer inspection before shipping is welcome, third party inspection is no problem.
6、Seamless Pipe ASTM A106/53 Images：
- Q: How are steel pipes protected against rusting?
- Corrosion protection is employed to safeguard steel pipes from rusting. Various methods are utilized for preventing the formation of rust on steel pipes, including the following: 1. Coatings: To create a barrier against rust, different coatings are applied to the surface of steel pipes. These coatings prevent oxygen and moisture from reaching the metal surface and initiating the rusting process. Options for coatings include epoxy, polyethylene, zinc, or a combination of these materials. 2. Galvanization: Steel pipes are immersed in a molten zinc bath to undergo galvanization. This process forms a protective layer of zinc on the surface of the pipes, acting as a sacrificial barrier. If any small areas of the pipe surface are exposed, the zinc coating will corrode instead of the steel, providing continuous protection against rust. 3. Cathodic Protection: Electrical current is utilized to safeguard steel pipes in this method. By connecting the pipes to a sacrificial anode, usually made of zinc or magnesium, the anode will corrode instead of the steel pipes when exposed to moisture and oxygen. This method is commonly employed in underground or underwater applications. 4. VCI (Vapor Corrosion Inhibitor) Technology: Chemical compounds are used in VCI technology to release a vapor that protects steel pipes from rusting. These compounds form a thin layer on the surface of the pipes, inhibiting the corrosion process by neutralizing oxygen and moisture. 5. Regular Maintenance: Aside from the aforementioned methods, regular inspection and maintenance play a crucial role in preventing rust formation on steel pipes. This involves cleaning the pipes, removing any accumulated debris or corrosive substances, and repairing any damaged coatings or protective layers. In summary, these corrosion protection methods effectively ensure the longevity and durability of steel pipes in various industrial, commercial, and residential applications by safeguarding them against rusting.
- Q: How are steel pipes tested for quality?
- Steel pipes are tested for quality through various methods such as visual inspection, dimensional measurement, mechanical testing, and non-destructive testing. Visual inspection ensures that there are no surface defects or deformities on the pipes. Dimensional measurement involves checking the pipe's size, thickness, and length to meet the required specifications. Mechanical testing involves subjecting the pipes to stress, pressure, and temperature to assess their strength and durability. Non-destructive testing techniques like ultrasonic, radiographic, or magnetic particle testing are used to detect any internal flaws or defects without damaging the pipes. These comprehensive quality tests ensure that steel pipes meet the necessary standards before they are used in various applications.
- Q: What is the weight and strength of steel pipes?
- Steel pipes can vary in weight and strength depending on their dimensions and the specific grade of steel used. The weight of steel pipes is typically measured in pounds per foot or kilograms per meter. The strength of steel pipes is commonly measured in terms of its yield strength and ultimate tensile strength. The weight of steel pipes can range from a few pounds per foot for smaller sizes to several hundred pounds per foot for larger diameters and thicker walls. The weight is influenced by factors such as the pipe's outer diameter, wall thickness, and length. For example, a 1-inch diameter steel pipe with a wall thickness of 0.125 inches may weigh around 0.67 pounds per foot, while a 12-inch diameter steel pipe with a wall thickness of 0.5 inches can weigh around 142 pounds per foot. The strength of steel pipes is determined by the grade of steel used, which can vary depending on the application and specific requirements. Common grades of steel used for pipes include ASTM A53 for general-purpose applications, ASTM A106 for high-temperature service, and API 5L for oil and gas transportation. These grades have different yield strengths and ultimate tensile strengths. Yield strength refers to the amount of stress a steel pipe can withstand before it begins to deform plastically. It is usually measured in pounds per square inch (psi) or megapascals (MPa). For example, ASTM A53 Grade B steel pipe has a minimum yield strength of 35,000 psi (240 MPa), while API 5L Grade X65 steel pipe has a minimum yield strength of 65,000 psi (448 MPa). Ultimate tensile strength, on the other hand, is the maximum stress a steel pipe can withstand before it fractures. It is also measured in psi or MPa. For instance, ASTM A106 Grade B steel pipe has an ultimate tensile strength of 60,000 psi (415 MPa), whereas API 5L Grade X65 steel pipe has an ultimate tensile strength of 77,000 psi (531 MPa). In summary, the weight and strength of steel pipes can vary depending on their dimensions and the grade of steel used. The weight is influenced by factors such as the pipe's diameter, wall thickness, and length, while the strength is determined by the steel's yield strength and ultimate tensile strength.
- Q: Are steel pipes resistant to UV radiation?
- No, steel pipes are not inherently resistant to UV radiation. They can be affected by prolonged exposure to UV rays, leading to degradation and potential damage over time.
- Q: How are steel pipes used in firefighting systems?
- Steel pipes are used in firefighting systems as a crucial component for delivering water and extinguishing agents to the affected areas. They are used to transport pressurized water from the water source to the fire hydrants, sprinkler systems, and fire hoses. Steel pipes are preferred for their durability, strength, and resistance to heat and corrosion, making them ideal for handling high-pressure water flow during firefighting operations.
- Q: Can steel pipes be bent?
- Steel pipes can indeed be bent. To achieve this, one usually employs specific tools and methods like pipe bending machines or hydraulic presses. These tools exert pressure on the pipe, leading it to change shape and adopt the desired angle or form. The flexibility of steel pipes makes them adaptable and appropriate for an array of purposes, such as plumbing, construction, and manufacturing. Nonetheless, it's crucial to acknowledge that the extent to which a steel pipe can be bent relies on factors like its diameter, wall thickness, and the type of steel employed.
- Q: What steel pipes are buried for outdoor heating pipes? Seamless or welded tube? Are there any rules for specific countries? Can use the seamed tube?
- The pipe material of heating pipe network should be designed according to the requirement. When the design is not specified, the following requirements shall be met:1 when the pipe diameter is less than or equal to 40mm, welded steel pipe shall be used.2 when the pipe diameter is 50 ~ 200mm, welded steel pipe or seamless steel pipe shall be used.3 when the pipe diameter is greater than 200mm, spiral welded steel pipe shall be used.
- Q: How do you calculate the pipe pressure drop coefficient for steel pipes?
- To calculate the pipe pressure drop coefficient for steel pipes, you can use the Darcy-Weisbach equation. This equation relates the pressure drop in a pipe to various factors such as the flow rate, pipe diameter, pipe length, and the properties of the fluid being transported. The pressure drop coefficient, also known as the friction factor or the Darcy-Weisbach friction factor, is denoted by the symbol f. It is a dimensionless parameter that represents the resistance to flow in the pipe. The value of f depends on the flow regime, which can be laminar or turbulent. For laminar flow, which occurs at low flow rates or with viscous fluids, the pressure drop coefficient can be calculated using the Hagen-Poiseuille equation. This equation relates the pressure drop to the fluid viscosity, pipe length, pipe diameter, and flow rate. However, for turbulent flow, which occurs at higher flow rates, the calculation of the pressure drop coefficient is more complex. It depends on the roughness of the pipe wall, which affects the flow resistance. The roughness is typically quantified using the relative roughness, which is the ratio of the pipe wall roughness to the pipe diameter. To calculate the pressure drop coefficient for turbulent flow in steel pipes, you can use empirical correlations or Moody's diagram. Moody's diagram provides a graphical representation of the friction factor as a function of the Reynolds number and the relative roughness. The Reynolds number represents the flow regime and is calculated using the fluid properties, flow rate, and pipe dimensions. By finding the intersection of the Reynolds number and relative roughness on Moody's diagram, you can determine the corresponding pressure drop coefficient. It's important to note that the pressure drop coefficient for steel pipes may vary depending on the specific pipe dimensions, surface roughness, and fluid properties. Therefore, it is recommended to consult relevant standards or engineering references for accurate and up-to-date values of the pressure drop coefficient for steel pipes in your specific application.
- Q: What are the common uses of steel pipes in construction?
- Steel pipes are commonly used in construction for various purposes such as carrying water, gas, and sewage, as well as for structural support in building frameworks, bridges, and underground piping systems. They are also used in the transportation of fluids and materials, making them essential in industries like oil and gas, manufacturing, and infrastructure development.
- Q: How are steel pipes connected to other materials like concrete or plastic?
- Various methods are commonly employed to connect steel pipes to other materials such as concrete or plastic. Among these methods, fittings play a significant role. Fittings, specialized components, serve to facilitate the connection between different materials or sections of pipe. These fittings are available in a variety of shapes and sizes, including elbows, tees, reducers, and couplings, and are designed to establish a dependable and leak-proof connection. When it comes to connecting steel pipes to concrete, one method involves the utilization of concrete anchors. These anchors are embedded within the concrete structure and provide a stable foundation for securing the steel pipe. Clamps or brackets are subsequently employed to attach the pipe to the anchor. In the case of joining steel pipes to plastic materials, the use of transition fittings proves to be effective. These fittings are specifically crafted to connect steel pipes with plastic pipes. They typically feature different connection mechanisms on each end, such as threads or compression fittings, enabling a secure and reliable joint. Welding techniques can also be employed to connect steel pipes to other materials in certain situations. Welding involves melting the ends of the steel and the other material together to create a robust joint. This method is commonly utilized for connecting steel pipes to steel structures or components. In summary, the connection of steel pipes to materials like concrete or plastic necessitates the utilization of specialized fittings, anchors, or welding techniques. These methods guarantee a secure, long-lasting connection capable of withstanding the demands of the given application.
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Welded square rectangular tubes for structure
- Ref Price:
-
- Loading Port:
- Tianjin
- Payment Terms:
- TT or LC
- Min Order Qty:
- 17 m.t.
- Supply Capability:
- 13000 m.t./month
OKorder Service Pledge
OKorder Financial Service
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