Seamless steel tubes for high-pressure chemical fertilizer

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Seamless steel tubes for high-pressure chemical fertilizer processmg equipmentStandard：
GB6479 Chinese national standard
Application：
Seamless steel tubes for high-pressure chemical fertilizer processing equipment and pipelines thereof
Model No．of steel tubes：
10、20、16Mn、10MoWVNb、15CrMo、1Cr5Mo、12 Cr2Moetc
.Diamensional tolerances:

Types of steel tubes	Outer diameter		Wall thickness
Cold-rolled tubes	Tube sizes(mm)	Tolerances(mm)	Tube sizes (mm)	Tolerances(mm)
	＞30～50	±0.3	≤30	±10％
	＞50～219	±0.8％	≤30	±10％
Hot-rolled tubes	＞219	±1.0％	＞20	±10％

Mechanical properties：

标准	牌号	抗拉强度（MPa）	屈服强度（MPa）	伸长率（％）	冲击功（J）	低温冲击Akv
GB6479	10	335～490	≥205	≥24	/	－20℃≥18
	20	410～550	≥245	≥24	≥39	－20℃≥18
	16Mn	490～670	≥320	≥21	≥47	－40℃≥21
	10MoWVNb	470～670	≥295	≥19	≥62
	15CrMo	440～640	≥235	≥21	≥47
	1Cr5Mo	390～590	≥195	≥22	≥94
	12 Cr2Mo	450～600	≥280	≥20	≥38

Chemical composition:

Standard codes	Models of steel tubes	Chemical compositions（％）
Standard codes	Models of steel tubes	C	Si	Mn	P	S	Cr	Mo	Ni
GB 6479	10	0.07～0.14	0.17～0.37	0.35～0.65	≤0.030	≤0.030	/	/	/
	20	0.17～0.24	0.17～0.37	0.35～0.65	≤0.030	≤0.030	/	/	/
	16Mn	0.12～0.20	0.20～0.60	1.20～1.60	≤0.030	≤0.030
	10MoWVNb	0.07～0.13	0.50～0.80	0.50～0.80	≤0.030	≤0.030	/	0.60～0.90	/
	15CrMo	0.12～0.18	0.17～0.37	0.40～0.70	≤0.030	≤0.030	0.80～1.10	0.40～0.55	/
	1Cr5Mo	≤0.15	≤0.50	≤0.60	≤0.030	≤0.030	4.00～6.00	0.45～0.60	≤0.60
	12 Cr2Mo	0.80～0.15	≤0.50	0.40～0.70	≤0.030	≤0.030	2.0～2.50	0.90～1.20

NOTE：the residual contents of the elements for the steel 10:Ni≤0.25％、Cr≤0.15％、Cu≤0.20％
the residual contents of the elements for the steel 20:Ni≤0.25％、Cr≤0.25％、Cu≤0.20％、Mo≤0.15％、V≤0.08％
the residual contents of the elements for the steel Ni≤0.30％、Cr≤0.30％、Cu≤0.20％

Q:How are steel pipes threaded for connection?: Steel pipes are threaded for connection using a process called threading, which involves cutting helical grooves into the pipe's surface. This is typically done using a machine called a pipe threading machine, which rotates the pipe while a cutting tool is held against it, creating the desired threading pattern. The threaded ends of the pipes can then be connected using fittings or couplings to create a secure and leak-proof joint.

Q:What is the role of steel pipes in the transportation of water?: Steel pipes are of utmost importance in the transportation of water due to their durability and strength. They find extensive use in diverse water supply systems, including municipal water distribution networks, irrigation systems, and industrial water transportation. One of the primary benefits of steel pipes lies in their capacity to endure high pressure and deliver water reliably over long distances. The strength of steel enables the construction of pipelines with larger diameters, facilitating the efficient movement of substantial water volumes. Additionally, steel pipes exhibit remarkable resistance to corrosion, a critical characteristic when conveying water that may contain different minerals, chemicals, or contaminants. The corrosion-resistant properties of steel pipes ensure that the water quality remains uncompromised throughout the transportation process. Furthermore, steel pipes offer exceptional structural integrity, rendering them suitable for both underground and above-ground installations. They can withstand extreme weather conditions, seismic activity, and heavy loads, thereby ensuring the longevity and dependability of the water transportation system. Moreover, steel pipes are easy to install and maintain, apart from being robust and durable. They can be seamlessly welded together, resulting in a pipeline with minimal leakage points. Regular inspections and maintenance help identify potential issues or damages, guaranteeing an uninterrupted flow of water. In conclusion, steel pipes play a critical role in water transportation, serving as a strong and reliable conduit. Their ability to withstand high pressure, resist corrosion, and maintain water quality make them an ideal choice for various water supply systems, contributing to the efficient and sustainable distribution of water resources.

Q:How are steel pipes used in the manufacturing of offshore wind turbines?: Steel pipes are used in the manufacturing of offshore wind turbines for various purposes. They are commonly used to create the foundation structures, such as monopiles and jacket structures, which provide stability and support for the turbines in the seabed. Steel pipes are also utilized for the construction of the tower and nacelle structures, providing a strong and durable framework for the turbine components. Additionally, steel pipes are employed for the installation of subsea cables, allowing for the transmission of electricity generated by the turbines to the shore. Overall, steel pipes play a crucial role in the manufacturing of offshore wind turbines by providing the necessary strength, stability, and infrastructure required for their operation.

Q:How do you calculate the bending moment of a steel pipe?: To determine the bending moment of a steel pipe, one must take into account both the applied load and the structural characteristics of the pipe. The bending moment quantifies the internal forces within the pipe caused by the applied load. To calculate the bending moment, one can use the following equation: Bending Moment = Load x Distance In this equation, the load represents the external force acting on the pipe, and the distance refers to the separation between the point of load application and the point where the bending moment is being evaluated. For an accurate bending moment calculation, it is necessary to consider the properties of the steel pipe. These properties encompass the pipe's cross-sectional area, second moment of area (also known as the moment of inertia), and the modulus of elasticity. The second moment of area demonstrates the pipe's resistance to bending and can be computed based on the dimensions of the pipe's cross-section. The modulus of elasticity signifies the pipe's stiffness and can be obtained from material properties data. Once the load, distance, cross-sectional area, moment of inertia, and modulus of elasticity are determined, they can be inputted into the bending moment equation to ascertain the bending moment for the steel pipe. It is important to recognize that the calculation of bending moment assumes linear elastic behavior, which implies that the pipe does not surpass its elastic limit nor undergo plastic deformation. If the pipe is exposed to loads surpassing its capacity, the bending moment calculation may not accurately depict the actual behavior of the pipe. In such instances, it is recommended to consult a structural engineer or employ more sophisticated analysis methods to precisely evaluate the bending moment.

Q:What are the applications of stainless steel pipes?: Stainless steel pipes are widely used in various industries and applications due to their excellent corrosion resistance, durability, and strength. Some common applications include plumbing systems, water supply and distribution, heating and cooling systems, oil and gas industry, chemical processing plants, food and beverage industry, automotive industry, construction, and infrastructure projects. Additionally, stainless steel pipes are also utilized in pharmaceutical manufacturing, aerospace engineering, marine applications, and wastewater treatment facilities.

Q:How are steel pipes used in the manufacturing of desalination plants?: Steel pipes are used in the manufacturing of desalination plants for various purposes such as transporting seawater, brine, and treated water within the plant. They provide durability, corrosion resistance, and the necessary strength to withstand high-pressure conditions, ensuring the efficient operation and long-term reliability of the desalination process.

Q:What is the average lifespan of steel pipes in different applications?: The average lifespan of steel pipes in different applications can vary depending on various factors such as the quality of the steel, the environment in which the pipes are used, and the maintenance and care they receive. In general, steel pipes used for water supply lines can have an average lifespan of around 50 to 70 years. This is because these pipes are typically made of high-quality steel and are subject to less corrosive environments. However, factors such as water chemistry, soil conditions, and the presence of corrosive substances can significantly influence the lifespan of these pipes. For steel pipes used in industrial applications such as oil and gas pipelines, the average lifespan can range from 20 to 50 years. These pipes are exposed to more aggressive environments, including high temperatures, pressure, and corrosive substances. Regular inspection, maintenance, and corrosion protection measures can help extend their lifespan. In construction applications, steel pipes used for structural purposes can have an average lifespan of 50 to 100 years or more. These pipes are typically designed to withstand heavy loads and are often protected by coatings or insulation to prevent corrosion. It's important to note that these are average lifespans and individual pipes may have shorter or longer lifespans depending on the specific conditions they are exposed to. Regular inspections, maintenance, and timely repairs or replacements when necessary can help ensure the longevity of steel pipes in different applications.

Q:What are the different types of steel pipe coatings for chemical processing plants?: There are several types of steel pipe coatings commonly used in chemical processing plants, including epoxy, polyethylene, polyurethane, and fusion-bonded epoxy (FBE) coatings. Each coating offers different benefits such as corrosion resistance, chemical resistance, and enhanced durability, which are crucial for protecting steel pipes against the harsh conditions and corrosive substances found in chemical processing plants.

Q:How are steel pipes used in natural gas processing plants?: Steel pipes are used in natural gas processing plants to transport and distribute the gas throughout the facility. They provide a reliable and durable infrastructure for the safe and efficient movement of gas from extraction to processing and distribution.

Q:What are the different methods of pipe welding for steel pipes?: There are several different methods of pipe welding for steel pipes, each with its own unique advantages and applications. Here are some of the most common methods: 1. Shielded Metal Arc Welding (SMAW): Also known as stick welding, SMAW is a manual welding process that uses a consumable electrode coated in flux. The electrode is melted to create the weld, and the flux creates a protective shield around the weld pool. SMAW is versatile and can be used in various positions, making it suitable for both field and workshop applications. 2. Gas Metal Arc Welding (GMAW): Commonly known as MIG (Metal Inert Gas) welding, GMAW uses a continuous wire electrode that is fed through a welding gun. The welding gun also supplies a shielding gas, such as argon or a mixture of argon and carbon dioxide, to protect the weld pool from atmospheric contamination. GMAW is known for its high welding speed and is often used in industrial applications. 3. Flux-Cored Arc Welding (FCAW): Similar to GMAW, FCAW uses a continuous wire electrode, but the wire is filled with flux instead of relying on an external shielding gas. The flux in the wire produces a protective shield around the weld pool, eliminating the need for a separate gas supply. FCAW is commonly used in outdoor and windy conditions as it provides better protection against atmospheric contamination. 4. Gas Tungsten Arc Welding (GTAW): Also known as TIG (Tungsten Inert Gas) welding, GTAW uses a non-consumable tungsten electrode to create the weld. The weld pool is protected by a shielding gas, typically argon, which is supplied separately. GTAW produces high-quality welds with excellent control, making it suitable for critical applications where precision is crucial. 5. Submerged Arc Welding (SAW): SAW is an automated welding process that uses a continuously fed wire electrode and a granular flux that is poured over the weld joint. The arc is submerged beneath the flux, providing excellent protection against contamination. SAW is commonly used in heavy fabrication and pipeline industries due to its high deposition rates and deep penetration capabilities. These are just a few of the different methods of pipe welding for steel pipes. The choice of method depends on factors such as the application, material thickness, desired weld quality, and available equipment. It is important to select the appropriate welding method to ensure strong, durable, and reliable welds in steel pipe applications.

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