Galvanized Rectangular hollow section 20#

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Loading Port:: Tianjin

Payment Terms:: TT OR LC

Min Order Qty:: 10 m.t.

Supply Capability:: 5000 m.t./month

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Product Name	rectangular hollow section/ RHS
Size	Size:	1010--500500mm
	Thickness:	0.45--16mm
	Length:	3-12m
Steel Grade	Q195,Q215,Q235,Q345,16Mn, 20#
Standard	ASTM A500,EN10219,GB/T6728,GB/T6725,JIS G3466
Usage	1. For Structure, Airport, Railway 2. Construction and so on.
Ends	Plain end or By Your Choice
Surface	Bared Or With Oiled Or Galvanized
Technique	ERW ,Hot Rolled and Cold Rolled
Section Shape	Rectangular
Inspection	With Hydraulic Testing, Eddy Current , Infrared Test
Package	Bags, Bundle, In Bulk, Containers
MOQ	20 Metric Ton / Can Be Negotiated
Supply Ability	15,000 Metric Ton/Month
Date of Delivery	7 days(Qty within 1000 Metric Ton) or According To The Quantity
Port of Shipment	Tianjin, China
Payment	L/C T/T

Q:What are the different pressure ratings for steel pipes?: Steel pipes have varying pressure ratings to indicate their maximum safe handling pressure. The pressure ratings of steel pipes can differ based on factors like pipe diameter, wall thickness, and material grade. Common pressure ratings for steel pipes are as follows: 1. Schedule 40: This is the standard pressure rating for general applications. It is suitable for low to medium pressure systems, with a maximum working pressure of 150 psi. 2. Schedule 80: Used for higher pressure requirements, it has a thicker wall thickness compared to Schedule 40, enabling it to handle working pressures of up to 300 psi. 3. Schedule 160: This heavy-duty pressure rating is for high-pressure applications. It has an even thicker wall thickness than Schedule 80 and can handle working pressures of up to 500 psi. In addition to these standard pressure ratings, there are specialized steel pipes available with higher pressure ratings, such as Extra Strong (XS) and Double Extra Strong (XXS). These pipes are designed for extremely high-pressure systems and have thicker walls than Schedule 160. It's important to note that the pressure ratings mentioned above specifically apply to steel pipes. Pressure ratings may vary for pipes made from other materials, such as copper or PVC. When selecting a steel pipe, it is crucial to consider the required pressure rating based on the specific application and system requirements to ensure safe and efficient operation.

Q:Are steel pipes affected by UV rays?: Yes, steel pipes can be affected by UV rays. Prolonged exposure to UV radiation can lead to the degradation of the protective coatings on steel pipes, causing them to corrode and weaken over time. It is important to implement proper protective measures, such as applying UV-resistant coatings or using protective covers, to mitigate the impact of UV rays on steel pipes.

Q:How are steel pipes tested for leaks?: Steel pipes can be tested for leaks using various methods, including hydrostatic testing, pneumatic testing, and using leak detection equipment such as ultrasonic testing or helium testing.

Q:What are the common factors affecting the flow capacity of steel pipes?: The flow capacity of steel pipes can be affected by several common factors. Firstly, the diameter of the pipe plays a crucial role. A larger diameter allows for a greater flow capacity because there is more area for the fluid to pass through. Secondly, the length of the pipe also affects flow capacity. Longer pipes tend to have higher frictional losses, which can decrease the flow capacity. Thirdly, the internal surface roughness of the steel pipe can impact flow capacity. Rough surfaces create more friction, resulting in a lower flow rate. Conversely, smooth pipes allow for smoother flow and higher flow capacity. The properties of the fluid being transported through the steel pipe are another important consideration. Factors such as viscosity, temperature, and density can all influence the flow rate. For example, highly viscous fluids have a lower flow capacity compared to less viscous fluids. Additionally, pressure drop along the length of the pipe is a significant factor. Friction, bends, and restrictions can all cause pressure losses, resulting in a lower flow capacity. The material of the steel pipe and its wall thickness also play a role. Different materials have varying properties that can impact flow rates. Moreover, thicker walls can reduce the internal diameter of the pipe, leading to a lower flow capacity. Lastly, the design and layout of the pipe system, including the presence of fittings, can impact flow capacity. Fittings such as valves, elbows, and tees can cause additional pressure drops and turbulence, reducing the overall flow rate. Considering these factors is essential when designing or evaluating a steel pipe system to ensure optimal flow capacity and efficiency.

Q:What are the common methods of joining steel pipes?: The common methods of joining steel pipes include welding, threading, and using mechanical couplings. Welding involves fusing the pipes together using heat, while threading involves screwing the pipes together using threads on the ends. Mechanical couplings are devices that connect the pipes together using compression or other means.

Q:What is lined pipe?: Is the coating of the inside of the pipe, such as pipe conveying sulfuric acid will corrode, corrosion, but soft plastic pipe, buried in the ground to wall thicker, then you can use the liner and characteristics of hard for using steel pipe laying, sheathed in the steel pipe into the thin plastic tube, it can transport the sulfuric acid,

Q:Can steel pipes be used for wastewater treatment systems?: Yes, steel pipes can be used for wastewater treatment systems. Steel pipes are commonly used in wastewater treatment systems due to their durability, corrosion resistance, and ability to handle high pressure and flow rates. Moreover, steel pipes can be easily welded, making them suitable for various configurations and applications within the wastewater treatment process.

Q:Can steel pipes be used for underground compressed air pipelines?: Indeed, underground compressed air pipelines can utilize steel pipes. The strength and durability of steel pipes make them a popular choice for subterranean pipelines. They possess the capacity to endure high pressure and withstand corrosion and other environmental elements. Moreover, steel pipes are renowned for their extended lifespan, rendering them a dependable option for compressed air pipelines. Nevertheless, it is crucial to guarantee the adequate coating and protection of the steel pipes to avert any potential corrosion concerns. Furthermore, the proper installation and maintenance of these pipelines are vital to ensure their efficiency and safety.

Q:What's the difference between No. 20 steel pipe and 27SiMn Steel Pipe?: Cold plastic deformation and for bending, rolling, bending and hammer arch processing, arc welding and contact welding welding performance is good, when the thickness is small, prone to strict requirement of shape crack or complex shape parts. The cold or normalizing condition of cutting is better than that of annealing. It is generally used to make the material with little force and high toughness.

Q:Are steel pipes suitable for HVAC systems?: Indeed, steel pipes prove to be a suitable option for HVAC systems. HVAC applications widely favor steel pipes due to their numerous advantages. Initially, their robustness and durability enable them to endure the high pressure and temperature requirements commonly associated with HVAC systems. Furthermore, steel pipes exhibit exceptional resistance to corrosion, rendering them suitable for both indoor and outdoor installations. Moreover, their extended lifespan significantly reduces the need for frequent replacements or repairs. Additionally, the availability of steel pipes in various sizes and thicknesses facilitates effortless customization and installation. Lastly, steel pipes offer a cost-effective solution for HVAC systems compared to alternative materials, making them a financially efficient choice. In conclusion, steel pipes emerge as a reliable and appropriate selection for HVAC systems due to their strength, durability, corrosion resistance, availability, and cost-effectiveness.

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