Rectangular Hollow Section Q345

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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: How are steel pipes used in the infrastructure development?: Steel pipes are widely used in infrastructure development for various purposes such as water supply, sewage systems, gas pipelines, and transportation of oil and natural gas. They provide a durable and efficient solution for the construction of underground and aboveground infrastructure, ensuring the safe and reliable transportation of fluids and gases. Steel pipes are also used in the construction of bridges, buildings, and other structural components, as they offer strength, versatility, and resilience to withstand harsh environmental conditions.

Q: Material of welded steel pipe: GB/T3091-1993 (galvanized steel pipe for low pressure fluid delivery). Mainly used to transport water, gas, air, oil and heating, hot water or steam, etc. generally lower pressure fluid and other use tube. Its representative material is Q235 grade a steel.

Q: What are the advantages of using steel pipes in irrigation systems?: There are several advantages of using steel pipes in irrigation systems. Firstly, steel pipes are highly durable and can withstand harsh weather conditions and heavy loads, ensuring a long lifespan. Secondly, they have a high tensile strength, which means they can handle high pressure and water flow rates without the risk of bursting or leaking. Additionally, steel pipes are resistant to corrosion, which is crucial for maintaining water quality and preventing contamination. Lastly, steel pipes are easy to install and maintain, making them cost-effective in the long run.

Q: How long do steel pipes typically last?: Steel pipes typically have a lifespan of 50 to 100 years, depending on various factors such as the quality of the steel, installation conditions, maintenance, and exposure to corrosive elements.

Q: What is the maximum pressure that steel pipes can handle?: The maximum pressure that steel pipes can handle varies depending on factors such as the specific grade of steel, diameter, and wall thickness of the pipe. However, steel pipes are known for their high strength and durability, and they can typically handle pressures ranging from a few hundred to several thousand pounds per square inch (psi).

Q: How are steel pipes inspected for quality control?: Steel pipes are inspected for quality control through various methods such as visual inspection, dimensional measurement, non-destructive testing techniques like ultrasonic testing, magnetic particle testing, and hydrostatic testing. These inspections ensure that the pipes meet the required specifications, are free from defects, and possess the necessary strength and integrity.

Q: What is the difference between black steel pipe and galvanized steel pipe?: The main difference between black steel pipe and galvanized steel pipe lies in their coating. Black steel pipe is untreated and has a dark, matte appearance, while galvanized steel pipe is coated with a layer of zinc to prevent rusting and has a silver, shiny appearance. This coating makes galvanized steel pipes more durable and suitable for outdoor use, while black steel pipes are commonly used for indoor plumbing and gas lines.

Q: What's wrong with the 3PP anticorrosive steel tube?: PP and PE are similar in processability, and the 3PE coating can be used to produce 3PP coatings without the need for a special 3PP coating line. However, the difference between PP and PE materials makes the 3PP and 3PE coatings show different properties, which can be applied to different environments. The advantages of 3PP coating on some properties make it possible to play an important role in the field of 3PE coating. Therefore, many foreign pipeline projects use 3PP anticorrosive coating.

Q: Do steel pipes expand or contract with temperature changes?: Steel pipes expand when subjected to an increase in temperature and contract when exposed to a decrease in temperature. This phenomenon is a result of the thermal expansion and contraction properties of steel, which is a characteristic of most materials. When steel pipes are heated, the molecules within the metal gain energy and vibrate more vigorously, causing them to move apart and expand in size. Conversely, when the temperature of the steel pipes decreases, the molecules lose energy and move closer together, resulting in a contraction or shrinkage in size. It is important to consider these thermal expansion and contraction properties of steel pipes when designing and installing them, as failure to account for these changes may lead to structural damage, leaks, or other issues.

Q: How do steel pipes perform in high-temperature applications?: Steel pipes perform well in high-temperature applications due to their high thermal conductivity and excellent resistance to heat. They can withstand extreme temperatures without deformation or structural failure, making them suitable for transporting hot fluids or gases in industrial processes.

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