Galvanized Rectangular hollow section/ RHS

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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 specific differences between flexible pipes and rigid pipes?: From the model:Rigid waterproof sleeve: A, B and C, A type, suitable for steel pipe, B, suitable for cast iron pipe and ductile iron pipe;Flexible waterproof bushings: A and B, A used in the internal walls of buildings, B used in the exterior walls of buildings.In use:

Q: How are steel pipes protected against external corrosion in coastal areas?: To safeguard steel pipes against external corrosion in coastal regions, a combination of coating and cathodic protection methods is employed. An effective approach involves applying a protective coating onto the steel surface, forming a barrier against corrosive elements like saltwater and humidity present in the coastal environment. Commonly used coating materials, such as epoxy or polyethylene, possess corrosion-resistant properties and offer long-lasting protection. Furthermore, cathodic protection is utilized to enhance the corrosion resistance of the steel pipes. This technique employs sacrificial anodes or impressed current to prevent corrosion. Sacrificial anodes, typically made of zinc or aluminum, are attached to the steel pipe and corrode in place of the steel, sacrificing themselves to safeguard the steel surface. On the other hand, impressed current systems rely on an external power source to provide a protective current, effectively preventing corrosion. Ensuring the effectiveness of the protective coating and cathodic protection system necessitates regular inspection and maintenance. Coatings may degrade over time due to wear and tear, requiring periodic evaluation and reapplication if necessary. Similarly, sacrificial anodes must be replaced when depleted, and impressed current systems need to be monitored and adjusted to maintain the desired level of protection. By combining the application of durable coatings with cathodic protection measures, steel pipes in coastal areas can be adequately shielded against external corrosion, promoting their durability and optimal performance.

Q: How are steel pipes graded?: Steel pipes are graded based on several factors to determine their quality and suitability for specific applications. The grading system for steel pipes typically includes parameters such as the chemical composition, mechanical properties, manufacturing method, and testing standards. 1. Chemical composition: Steel pipes are graded based on the elements present in their composition. This includes the amount of carbon, manganese, phosphorus, sulfur, and other alloying elements. The chemical composition greatly influences the pipe's strength, corrosion resistance, and other properties. 2. Mechanical properties: The mechanical properties of steel pipes are crucial for determining their strength, flexibility, and resistance to pressure and temperature. These properties include tensile strength, yield strength, elongation, hardness, and impact toughness. Pipes with higher mechanical properties are generally graded higher. 3. Manufacturing method: Steel pipes can be manufactured using various methods, such as seamless, welded, or ERW (Electric Resistance Welding). The manufacturing method affects the pipe's integrity, dimensional accuracy, and overall quality. Seamless pipes, for example, are considered to have higher quality due to their uniformity and absence of weld seams. 4. Testing standards: Steel pipes are graded based on their adherence to specific testing standards. These standards ensure that the pipes meet the required quality criteria and are suitable for their intended applications. Common testing standards include ASTM (American Society for Testing and Materials), API (American Petroleum Institute), and EN (European Norms). Based on these factors, steel pipes are often graded using alphanumeric codes or specifications. For instance, pipes used in oil and gas industry may be graded as API 5L (American Petroleum Institute) or pipes used for structural purposes may be graded as ASTM A500 (American Society for Testing and Materials). In conclusion, steel pipes are graded based on their chemical composition, mechanical properties, manufacturing method, and adherence to testing standards. These grades help customers and manufacturers in selecting the appropriate pipes for specific applications, ensuring safety, durability, and efficiency in various industries.

Q: What is the difference between internal and external coating of steel pipes?: The main difference between internal and external coating of steel pipes is their purpose and the materials used. The internal coating is applied to the inside surface of the pipe to protect it from corrosion, erosion, and chemical reactions with the transported fluids. It is typically made of materials such as epoxy or polyethylene. On the other hand, the external coating is applied to the outside surface of the pipe to provide protection against atmospheric corrosion, soil corrosion, and mechanical damage. External coatings are usually made of materials like fusion-bonded epoxy, polyethylene, or polypropylene.

Q: What are the different end types for steel pipes?: Steel pipes can have various end types, each designed for a specific purpose. Some common end types include: 1. Plain End: This is the simplest type, with no threading or special treatment. It is used for non-threaded applications or when welding is required. 2. Threaded End: These ends have male threads on one or both sides, allowing for easy connection with other threaded fittings or pipes. They are commonly used in plumbing and gas applications that require easy assembly and disassembly. 3. Beveled End: Beveled ends are cut at an angle (usually 30 or 45 degrees) to facilitate welding. The smooth transition between the pipe and the weld joint ensures a strong connection. They are used in construction, oil and gas, and pipeline industries. 4. Coupling End: These ends have female threads on both sides, enabling the joining of two pipes with a coupling or fitting. They are often used in plumbing systems or for easily disassembling pipe sections. 5. Flanged End: Flanged ends have a flared or raised lip on one or both sides, allowing for easy attachment to other flanged components like valves or pumps. They are commonly used in industrial applications requiring secure connections. 6. Socket Weld End: These ends have a socket or recess on one or both sides, allowing for easy connection with socket weld fittings. They provide a strong joint and are commonly used in high-pressure applications, such as petrochemical or power plants. These examples demonstrate the variety of end types available for steel pipes. The choice depends on specific application requirements, including the need for easy assembly, disassembly, or compatibility with other fittings.

Q: How are steel pipes used in fire protection systems?: Steel pipes are commonly used in fire protection systems because of their durability and resistance to high temperatures. They are used to transport water or other fire suppressants to sprinkler heads or fire hydrants, ensuring quick and efficient extinguishing of fires. The strength of steel pipes also allows them to withstand the pressure and force of water flow, making them a reliable choice for fire protection systems.

Q: How are steel pipes protected during transportation?: Steel pipes are typically protected during transportation through a variety of means such as wrapping them with protective coatings, using plastic or metal caps to cover the ends, and securing them with straps or bands to prevent any movement or damage. Additionally, they may be placed in crates or on pallets and secured with stretch film or shrink wrap for added protection.

Q: Can steel pipes be used for fire protection systems?: Yes, steel pipes can be used for fire protection systems. Steel pipes are commonly used in fire sprinkler systems because they have high strength and durability, making them suitable for carrying pressurized water to extinguish fires. Steel pipes also have fire-resistant properties, which further enhances their suitability for fire protection systems.

Q: What are the common maintenance practices for steel pipes?: Steel pipes require regular inspections, cleaning, and corrosion prevention as part of their maintenance. It is crucial to conduct inspections frequently to detect any signs of damage or wear. These inspections can involve visual assessments and non-destructive testing methods like ultrasonic or magnetic particle inspection. Scheduling inspections ensures early detection of issues, allowing for prompt resolution. Cleaning is also a vital maintenance practice for steel pipes. It involves the removal of dirt, debris, and scale that may accumulate on both the inside and outside of the pipes. Regular cleaning prevents blockages, enhances flow efficiency, and reduces the risk of corrosion. Corrosion prevention plays a significant role in maintaining steel pipes. Different methods, such as applying protective coatings, utilizing cathodic protection systems, or implementing corrosion inhibitors, can be employed to safeguard the pipes. These measures extend the pipes' lifespan and preserve their structural integrity over time. Additional maintenance practices may include repairing or replacing damaged sections of the pipes, maintaining proper insulation to prevent heat loss or gain, and monitoring the pipes for any signs of leakage or pressure drops. In summary, regular inspections, cleaning, and corrosion prevention are vital maintenance practices for steel pipes. Implementing these practices prolongs the pipes' lifespan and allows for the identification and resolution of potential issues before they cause significant damage or disruptions.

Q: How are steel pipes protected against soil movement or settlement?: Steel pipes can be protected against soil movement or settlement through the use of various measures such as proper design and installation techniques, including the use of appropriate bedding materials, backfilling with compacted soil, and the addition of protective coatings or linings. Additionally, the implementation of geotechnical investigations and monitoring systems can help identify potential soil movement or settlement issues in advance, allowing for proactive measures to be taken to mitigate any potential damage to the steel pipes.

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