Seamless steel tubes for ships

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Standards：
Standard for malerials and wielding from Chinese classifying society Chinese clasifying society(CCS)
Standard of DNV Det Norske Veritas(DNV)
Standard of Lloyd’S Register of UK(LR)　Lloyd’S Register of UK(LR)Standard of Germanischer Lloyd Germanischer Lloyd(GL)
Standard of American Bureau of Shipping(ABS)American Bureau of Shipping(ABS)
Standard of BUREAU VERITAS(BV)BUREAU VERITAS(BV)
Standard of RINA Italian classification society(RINA)
Standard of NIPPON KAIJI KYOKAI(NK)NIPPON KAIJI KYOKAI(NK)
GB／T5312 Chinese national standard
Appication：
Seamless steel tubes for manufacturing marine boilers and ovemeaters as we as pressure pipes opf grade I and Ⅱ．
Model N0．of major steel tubes
320，360，410，460，490，etc．

Types of steel tubes	Outer diameters		wall thickness
Cold-rolled tubes	Rube size(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％

Mechanocal properties：

Standard code	Models of steel tubes	Tensile strength（MPa）	Yield strength（MPa）	Elongation（％）
GB/T5312	320	320～410	≥195	≥25
	360	360～480	≥215	≥24
	410	410～530	≥235	≥22
	460	460～580	≥265	≥21
	490	490～610	≥285	≥21

Chemical compisition:

Standard code	Models of steel tubes	Chemical compisition（％）
Standard code	Models of steel tubes	C	Si	Mn	P	S
GB/T5312	320	≤0.16	≤0.35	0.40～0.70	≤0.035	≤0.035
	360	≤0.17	≤0.35	0.40～0.80	≤0.035	≤0.035
	410	≤0.21	≤0.35	0.40～1.20	≤0.035	≤0.035
	460	≤0.22	≤0.35	0.80～1.40	≤0.035	≤0.030
	490	≤0.23	≤0.35	0.80～1.50	≤0.035	≤0.030

Note：residual elements:Cr≤0.25％，Mo≤0.10％，Ni≤0.30％，Cu≤0.30％aggregate≤0.70％

Q:How are steel pipes used in the pulp and paper industry?: Steel pipes are widely used in the pulp and paper industry for various applications. They are primarily used for conveying corrosive chemicals, hot water, steam, and other fluids throughout the production process. Steel pipes provide high strength, durability, and resistance to corrosion, which is crucial in an industry where harsh chemicals are involved. They are used in the transportation of pulp, bleaching agents, and various liquids within the production facilities, ensuring efficient and reliable operations in the pulp and paper industry.

Q:How are steel pipes used in the manufacturing of wastewater treatment systems?: Steel pipes are used in the manufacturing of wastewater treatment systems for various purposes such as carrying and transporting wastewater, providing structural support to the system, and facilitating the flow of water and chemicals throughout the treatment process.

Q:Is it good to buy a simple wardrobe or a steel pipe?: Natural nobility, if the quality and the degree of firmness, is the simple steel cloth cabinet is the best. However, because the texture of wood wardrobe, solid wood wood may be used after deformation.

Q:Are steel pipes suitable for potable water supply?: Yes, steel pipes are suitable for potable water supply. They are durable, have a long lifespan, and can withstand high pressure. Additionally, steel pipes are resistant to corrosion and provide a reliable and safe option for transporting potable water.

Q:Can steel pipes be used for steam distribution?: Yes, steel pipes can be used for steam distribution. Steel pipes are commonly used in steam distribution systems due to their high strength, durability, and resistance to high temperatures and pressure. They can effectively handle the transportation of steam in various industries such as power generation, chemical processing, and heating systems.

Q:What are the different coating options for steel pipes?: Steel pipes have numerous coating options to choose from, each serving a specific purpose and offering unique advantages. Some common coating options for steel pipes include: 1. Fusion Bonded Epoxy (FBE) Coating: FBE coating is widely used across industries due to its exceptional corrosion resistance, impact resistance, and adhesion to the pipe surface. This coating is typically applied through a heat-induced chemical reaction, resulting in a durable and protective layer. 2. Polyethylene (PE) Coating: PE coating is commonly employed for underground steel pipes as it provides superior resistance against corrosion, abrasion, and chemicals. It is applied using extrusion techniques, forming a seamless layer that prevents moisture penetration. 3. Polyurethane (PU) Coating: PU coating is renowned for its outstanding resistance to abrasion, chemicals, and harsh environmental conditions. It is frequently used for steel pipes exposed to extreme temperatures or aggressive environments. Multiple layers of PU coating can be applied to enhance protection. 4. Coal Tar Enamel (CTE) Coating: CTE coating is a traditional choice for steel pipes requiring protection against corrosion. It is a thick, black coating that effectively resists water, soil, and atmospheric corrosion. This coating is typically applied using a hot-applied method. 5. Zinc Coating: Zinc coating, also known as galvanization, is a widely used protective coating for steel pipes. It involves applying a layer of zinc to create a barrier against corrosion. Zinc coating can be applied through hot-dip galvanization or electro-galvanization techniques. 6. Concrete Coating: Concrete coating is often utilized for steel pipes in underground or submerged applications. It provides a robust protective layer against corrosion, abrasion, and mechanical damage. Concrete coating is typically applied as a cement mortar or reinforced concrete layer. These options represent just a few of the available coatings for steel pipes. The selection of a coating depends on factors such as the intended application, environmental conditions, and desired durability. Choosing the appropriate coating is crucial to ensure the longevity and performance of steel pipes in various industries.

Q:How are steel pipes used in the construction of stadiums?: Steel pipes are used in the construction of stadiums for various purposes such as structural support, plumbing, and drainage systems. They are commonly used to create the framework and support structures for the stadium's roof, stands, and other architectural elements. Additionally, steel pipes are also utilized in the installation of plumbing systems for supplying water and gas, as well as for drainage systems to manage wastewater and rainwater. Overall, steel pipes play a crucial role in providing strength, durability, and functionality to stadiums during their construction.

Q:How are steel pipes used in the power generation industry?: Steel pipes are extensively used in the power generation industry for various purposes, such as transporting steam, water, and other fluids in power plants. They provide a reliable and durable solution for the high-pressure and high-temperature conditions found in power generation systems. Steel pipes are also used for the construction of boilers, condensers, and heat exchangers, ensuring efficient heat transfer and energy production. Additionally, steel pipes are employed in the exhaust system of power plants to safely and efficiently discharge emissions. Overall, steel pipes play a critical role in the power generation industry by facilitating the transportation of fluids and contributing to the reliable and efficient operation of power plants.

Q:How to distinguish seamless pipe and welded pipe?: Most of the welded pipe is six meters, the pipe has obvious welding marks, and seamless pipe wall without welding marks

Q:How are steel pipes used in the construction of gas distribution networks?: Steel pipes are commonly used in the construction of gas distribution networks due to their durability, strength, and ability to withstand high pressure. These pipes are used to transport natural gas from the source to homes, businesses, and industries. The steel pipes are laid underground and connected using fittings and valves to create a network that efficiently distributes gas. It ensures a safe and reliable delivery of gas to consumers while minimizing the risk of leaks or accidents.

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