Steel pipe A335P9 1-18

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Loading Port:: China Main Port

Payment Terms:: TT OR LC

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Supply Capability:: 200T m.t./month

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A335P9 Steel pipe The standing stock of specifications

A335P9 Steel pipe 70*4.5-5-6-7-8-9-10-12-15-16
A335P9 Steel pipe 245*8-10-14-17-20 -22-30-40

P5 C≤0.15 Mn 0.3-0.6 P ≤0.25 S≤0.25

Si 0.25-1.0 Cr 8-10 Mo 0.9-1.1

Alloy pipe is a steel pipe according to the production materials (i.e. material) to define, just as its name implies is made of alloy steel seamless pipe; and is in accordance with the production process (seamed seamless) to define, seamed pipe seamless pipe is different from, including straight seam welded pipe and spiral tube.

Manufacturing process

1 hot-rolled (extrusion seamless pipe): billet, heating, perforation, three roll cross rolling, rolling or extrusion, tube off, sizing pipe (or reducing), cooling, straightening, water pressure test (or testing), marking, storage

2 cold drawing (rolling) seamless steel pipe: billet, heating, perforation, heading, annealing, pickling, oiling round tube (copper) and multi pass drawing (Leng Zha), the blank pipe, heat treatment, straightening, water pressure test (testing), marking, storage

[(diameter - thickness) * wall thickness of]*0.02466=kg/ meters (per metre weight)

Alloy pipe use

Alloy pipe for low and medium pressure boiler (work pressure is generally not more than 5.88Mpa, the operating temperature at 450 DEG C) of the heating surface tube; used for high pressure boiler (work pressure is generally above 9.8Mpa, operate at a temperature of 450 DEG to 650 DEG C between) the heating surface tubes, economizer, superheater, reheater, petrochemical industry uses the tube and so on.

Q:What are the common methods for repairing steel pipes?: Depending on the nature and extent of the damage, there are several common methods available for repairing steel pipes. One method frequently used is welding. This technique involves melting the damaged area and fusing it with a new piece of steel. Welding is typically employed for small cracks or holes in the pipe. Different welding techniques, such as shielded metal arc welding (SMAW), gas metal arc welding (GMAW), or tungsten inert gas (TIG) welding, can be utilized. Another option is pipe wrapping or bandaging. This method entails wrapping a layer of adhesive tape or resin-soaked fiberglass around the damaged section of the pipe. It is suitable for addressing small leaks or corrosion spots and serves as a temporary solution until a more permanent fix can be implemented. If the damage is extensive or the pipe suffers severe corrosion, pipe lining or relining may be necessary. This involves inserting a new pipe liner inside the existing one, effectively creating a new pipe within the old one. Various materials, such as epoxy, polyethylene, or cured-in-place pipe (CIPP), can be used for this method. Pipe lining is commonly employed for larger diameter pipes or when replacement is not feasible. In some instances, minor leaks or cracks can be repaired using pipe clamps or sleeves. These devices are designed to be clamped around the damaged section and can provide either a temporary or permanent solution, depending on the severity of the damage. Ultimately, the choice of repair method depends on factors such as the extent of the damage, accessibility of the damaged area, budget constraints, and the required long-term durability. It is advisable to consult with a professional pipe repair specialist to assess the specific situation and determine the most suitable method for repairing steel pipes.

Q:How are steel pipes coated to prevent external corrosion?: Steel pipes are coated to prevent external corrosion through a process called external coating. This typically involves applying a layer of protective material, such as epoxy or polyethylene, onto the surface of the steel pipe. The coating acts as a barrier, preventing moisture and other corrosive substances from coming into contact with the steel. This helps to prolong the life of the pipe and maintain its structural integrity.

Q:What are the common standards for steel pipe manufacturing?: The common standards for steel pipe manufacturing include specifications set by organizations such as the American Society for Testing and Materials (ASTM), the International Organization for Standardization (ISO), and the American National Standards Institute (ANSI). These standards cover various aspects such as size, dimensions, material properties, manufacturing process, and testing requirements to ensure the quality and consistency of steel pipes.

Q:How are steel pipes used in seaport infrastructure?: Steel pipes are commonly used in seaport infrastructure for various purposes such as constructing piers, wharfs, and docks. They are used for the foundation of these structures, providing stability and strength. Steel pipes are also used in the construction of underwater pipelines for transporting oil, gas, and other fluids. Additionally, they are utilized in the fabrication of fences, barriers, and railings to ensure safety and security within the seaport area.

Q:Can steel pipes be used for paper mills?: Yes, steel pipes can be used for paper mills. Steel pipes are widely used in various industries, including paper mills, due to their durability, strength, and resistance to corrosion. These pipes are commonly used for transporting water, chemicals, steam, and other fluids within the paper mill facilities.

Q:Is the PVC tube a plastic tube or a plastic tube?.: Or polymer polymerized by radical polymerization under the action of light and heat. The vinyl chloride homopolymer and vinyl chloride copolymer are collectively referred to as vinyl chloride resins. The material is a non crystalline material. PVC materials often use stabilizers, lubricants, auxiliary processing agents, pigments, anti shock agents and other additives in practical use. Is not flammable, high strength, excellent resistance to climate variability and geometric stability. PVC has strong resistance to oxidizing agents, reducing agents and strong acids. However, it can be corroded by concentrated oxidizing acids such as concentrated sulfuric acid and concentrated nitric acid, and it is also not suitable for contact with aromatic hydrocarbons and chlorinated hydrocarbons.

Q:How are steel pipes classified based on their end connections?: Steel pipes can be classified based on their end connections into three main categories: threaded, flanged, and welded. Threaded pipes have screw threads on the ends, allowing for easy assembly and disassembly. Flanged pipes have flanges on the ends, which are flat surfaces that can be bolted together, providing a strong connection. Welded pipes have their ends welded together, creating a permanent and secure joint.

Q:Do steel pipes expand or contract with temperature changes?: When the temperature increases, steel pipes undergo expansion, while they contract when the temperature decreases. This occurrence is due to the thermal expansion and contraction characteristics of steel, which are present in most materials. When steel pipes are heated, the molecules within the metal gain energy and vibrate more intensely, causing them to separate and increase in size. On the contrary, when the temperature of the steel pipes decreases, the molecules lose energy and move closer together, resulting in a reduction or shrinking in size. It is crucial to take into consideration these thermal expansion and contraction properties of steel pipes during their design and installation, as failure to accommodate these fluctuations might result in structural damage, leaks, or other complications.

Q:What is the difference between steel pipes and FRP pipes?: Steel pipes and FRP (Fiber Reinforced Plastic) pipes are two different types of pipes that are commonly used in various industries and applications. Here are the key differences between the two: 1. Material Composition: Steel pipes are made of steel, which is an alloy of iron and carbon, with additional elements like manganese, silicon, and traces of other metals. On the other hand, FRP pipes are composed of a polymer matrix reinforced with fibers, such as glass or carbon fibers. 2. Strength and Durability: Steel pipes are known for their high strength and durability. They can withstand high pressures, heavy loads, and extreme temperatures. FRP pipes, although strong and durable, are comparatively lighter in weight and may not have the same level of strength as steel pipes. However, they are corrosion-resistant and have a longer lifespan in corrosive environments. 3. Corrosion Resistance: Steel pipes are prone to corrosion and require protective coatings or linings to prevent rust and deterioration. FRP pipes, on the other hand, are inherently corrosion-resistant. They do not require additional coatings and are suitable for transporting corrosive fluids or operating in corrosive environments. 4. Installation and Maintenance: Steel pipes require specialized welding or threading techniques for installation. They can be more labor-intensive and time-consuming to install, especially in complex or large-scale projects. FRP pipes, on the other hand, are lightweight and can be easily transported and installed. They often come in pre-fabricated sections, making installation faster and less labor-intensive. Additionally, FRP pipes require minimal maintenance compared to steel pipes. 5. Cost: Steel pipes are generally more expensive than FRP pipes due to the higher cost of raw materials and the need for additional corrosion protection measures. FRP pipes offer a cost-effective alternative, especially in applications where corrosion resistance is essential, as they eliminate the need for expensive coatings or linings. Overall, the choice between steel pipes and FRP pipes depends on the specific requirements of the application. Steel pipes are preferred for their high strength, while FRP pipes offer benefits such as corrosion resistance, lightweight, and cost-effectiveness.

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