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WELDED ROUND STEEL PIPE

National Standard
Welded Steel Pipe For Transportation Of Low Pressure Fluid
GB/T13091-2001
1	Outside Diameter Of Steel Pipe
	Outside Diameter D/mmm	Tolerance Of Pipe Outside Diameter	Tolerance Of Pipe And Outside Diameter/mm
	D≤48.3	±0.5mm
	48.3<D≤508	±1.0%
	168.3<D≤508	±0.75%	+2.4 -0.8
	D>508	±1.0%	+3.0 -0.8
	Tolerance Of Wall Thickness	±12.5%
2	Length	Usual Length	Tolerance
		4M-9M	+20 -0
		Multiple Length:5-10mm Tolerance For Each Mutiple	+20 -0
3	Bending	≤168.3mm	Straight For Ordinary Use Or Negotiate The Bending
3	Bending	>68.3mm	Smaller Than 0.2%Of Full Length Steel Pipe

Q: Are steel tubes and round steel in weight or length when purchased?: It's priced by weight. The cutting process should size to determine the length (otherwise - please specify the weight of the material), the material ration to calculate weight for cost accounting as.

Q: How are steel pipes used in the automotive manufacturing industry?: Steel pipes are commonly used in the automotive manufacturing industry for various purposes such as exhaust systems, chassis frames, and structural components. These pipes provide durability, strength, and resistance to corrosion, making them ideal for applications that require high performance and reliability.

Q: Can steel pipes be used for the construction of offshore platforms?: Yes, steel pipes can be used for the construction of offshore platforms. Steel pipes are commonly used in offshore construction due to their high strength, durability, and resistance to corrosion in harsh marine environments. They are suitable for various applications, including the fabrication of jacket legs, risers, pile sleeves, and other structural components necessary for offshore platform construction.

Q: What are the quality control measures for steel pipe production?: Quality control measures for steel pipe production typically include the inspection of raw materials, monitoring of manufacturing processes, and testing of finished products. These measures ensure that the steel pipes meet the required specifications and standards. Additionally, quality control may involve conducting visual inspections, dimensional checks, non-destructive testing, and mechanical testing to ensure the strength, durability, and overall quality of the pipes.

Q: How are steel pipes used in the manufacturing of HVAC systems?: Steel pipes are commonly used in the manufacturing of HVAC systems for various purposes. They are primarily used for transporting fluids such as water, refrigerants, and gases throughout the system. Steel pipes provide durability and strength, ensuring the safe and efficient transfer of these substances. Additionally, steel pipes are often used for structural support, acting as a framework for the HVAC system. Overall, steel pipes play a crucial role in the manufacturing of HVAC systems by facilitating fluid transportation and providing structural stability.

Q: How do steel pipes perform in high-temperature environments?: Steel pipes perform well in high-temperature environments due to their excellent heat resistance and thermal conductivity. The strength and structural integrity of steel pipes remain largely unaffected, making them ideal for applications such as steam lines, boiler tubes, and high-temperature industrial processes.

Q: What is the difference between the stainless steel pipe welded pipe and seamless pipe?: Seamless tube is a strip of steel with a hollow cross section and no seams at all. The general is rolled into a cylindrical tube plate welding.

Q: What is the difference between ERW and SAW steel pipes?: ERW (Electric Resistance Welded) steel pipes are manufactured by welding the edges of the steel strip or coil together to form a pipe. On the other hand, SAW (Submerged Arc Welded) steel pipes are manufactured by welding the steel plates or coils together using a submerged arc welding process. The main difference between the two is the method of welding used. SAW pipes generally have a higher strength and better dimensional accuracy compared to ERW pipes.

Q: What are the different types of steel pipe end connections?: There are several types of steel pipe end connections, including threaded, welded, flanged, grooved, and compression fittings.

Q: How long do steel pipes last?: The lifespan of steel pipes can vary depending on several factors, including the quality of the steel used, the environment in which they are installed, and the maintenance and care given to them. Generally, steel pipes are known for their durability and longevity. With proper installation and regular maintenance, steel pipes can last for several decades, often exceeding 50 years. However, it is important to note that external factors such as corrosion, exposure to extreme temperatures, and chemical reactions can significantly affect their lifespan. Regular inspections, timely repairs, and protective coatings can help extend the life of steel pipes, ensuring their reliability and functionality for many years.

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