Seamless steel tubes for ships

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Loading Port:: China Main Port

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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: What are the properties of steel that make it suitable for pipe manufacturing?: Steel is an ideal material for pipe manufacturing due to its various properties, including high strength, durability, and resistance to corrosion and extreme temperatures. It can withstand high pressure and can be easily fabricated into different shapes and sizes, making it versatile for various piping applications. Additionally, its smooth surface ensures efficient flow of fluids and reduces friction losses.

Q: The difference between 12Cr1MoVG alloy steel tube and 15CrMo: 15CrMo is a steel Pearlite Heat-resistant steel, has high heat resistance at high temperature (b = 440MPa) and antioxidant activity, and has certain ability of anti hydrogen corrosion. Because of the high content of Cr, C and other alloy elements in steel, the tendency of hardening of steel is obvious, and the weldability is poor.

Q: How are steel pipes recycled?: Steel pipes are recycled through a multi-step process that involves collection, sorting, cleaning, and melting. First, the used steel pipes are gathered from various sources such as construction sites or industrial facilities. Then, they are sorted based on their size, shape, and quality. Next, any contaminants or coatings are removed from the pipes through cleaning and stripping processes. Finally, the cleaned pipes are melted down in a furnace, and the molten steel is formed into new pipes or other steel products. This recycling process reduces the demand for new raw materials and helps conserve energy and resources.

Q: How are steel pipes used in the construction of high-rise buildings?: Steel pipes are commonly used in the construction of high-rise buildings for various purposes, such as structural support, plumbing, and fire protection systems. They provide strength and durability to the building's framework, allowing it to withstand heavy loads and extreme weather conditions. Steel pipes also play a crucial role in carrying water, sewage, and other utilities throughout the building, ensuring efficient functionality. Additionally, they are utilized in the installation of fire sprinkler systems, enhancing the safety measures of the high-rise structure.

Q: How are steel pipes insulated for thermal purposes?: Steel pipes are commonly insulated for thermal purposes using a variety of methods. One of the most common methods is to wrap the pipes with insulation material such as fiberglass, mineral wool, or foam. This insulation material acts as a barrier between the pipe and the surrounding environment, preventing heat transfer or loss. To properly insulate steel pipes, the insulation material is typically wrapped tightly around the pipe, ensuring that there are no gaps or openings for heat to escape. The insulation is then secured in place using adhesive tapes or metal bands. In addition to external insulation, pipes can also be internally insulated. This involves placing insulation material inside the pipe, creating a layer of protection against heat loss or gain. Internal insulation is commonly used in applications where the pipe carries hot fluids or gases. Furthermore, some steel pipes are designed with a built-in insulation layer. These pipes, known as pre-insulated pipes, have insulation material already integrated into the pipe structure. The insulation layer is typically made of foam or mineral wool and is covered with a protective outer layer, providing effective thermal insulation. Insulating steel pipes for thermal purposes is crucial in various industries, such as oil and gas, HVAC, and plumbing. Proper insulation helps to maintain the desired temperature of the fluid or gas flowing through the pipes, preventing energy loss and improving overall efficiency.

Q: Can steel pipes be used for sewage disposal systems?: Yes, steel pipes can be used for sewage disposal systems. Steel pipes are commonly used for underground sewage lines due to their durability and resistance to corrosion. They can efficiently transport sewage from residential, commercial, or industrial areas to sewage treatment plants or disposal sites.

Q: What are the disadvantages of using steel pipes?: One major disadvantage of using steel pipes is their susceptibility to corrosion. Over time, exposure to moisture and certain chemicals can cause the pipes to rust and weaken, leading to leaks or structural damage. Additionally, steel pipes are generally heavier and more expensive than alternative materials, making them less suitable for certain applications where weight and cost are crucial factors.

Q: How are steel pipes used in the renewable energy industry?: Steel pipes are used in the renewable energy industry for various purposes such as transporting fluids, gases, and steam in thermal power plants, geothermal installations, and solar thermal systems. They are also utilized in the construction of wind turbine towers and the transmission of electricity from renewable energy sources.

Q: How are steel pipes inspected for quality?: The quality of steel pipes undergoes a thorough examination process involving diverse techniques and standards. Trained professionals conduct visual inspections to scrutinize the pipes for visible defects such as cracks, dents, or surface irregularities. This examination guarantees that the pipes meet the required specifications and are devoid of any visible flaws. Furthermore, non-destructive testing (NDT) methods are utilized to assess the internal and external quality of the steel pipes. Among the commonly used NDT techniques, ultrasonic testing stands out. This method involves transmitting ultrasonic waves through the pipes to detect any internal defects or inconsistencies in the material. It effectively identifies issues such as variations in wall thickness, inclusions, or weld defects that could compromise the pipe's integrity. Another widely employed NDT technique is magnetic particle inspection. By utilizing magnetic fields and iron particles, this method identifies surface cracks or flaws in the steel pipes. It is particularly effective for detecting defects in ferromagnetic materials and can be performed on both the outer and inner surfaces of the pipes. Moreover, hydrostatic testing is frequently conducted to evaluate the strength and pressure resistance of the pipes. This process involves filling the pipes with water or a suitable fluid and subjecting them to a specified pressure to check for leaks or structural weaknesses. This test ensures that the pipes can withstand the intended operational conditions without failing. In addition to these techniques, various quality control measures are implemented throughout the manufacturing process. These measures include material traceability, dimensional checks, and chemical composition analysis. They play a crucial role in ensuring that the steel pipes meet the required standards and specifications, thereby guaranteeing their quality and reliability. In summary, the inspection of steel pipes for quality involves a comprehensive approach encompassing visual inspection, non-destructive testing methods, and quality control measures. These thorough procedures enable the identification of defects, inconsistencies, or weaknesses, ensuring that the pipes meet the necessary quality standards and are suitable for their intended purpose.

Q: Can steel pipes be used for underground water wells?: Indeed, underground water wells can utilize steel pipes. The selection of steel pipes is frequently based on their robustness and resilience, rendering them apt for enduring the exerted force and load of the encompassing soil and water. They are extensively employed in residential and industrial settings for the purpose of drilling and constructing water wells. Nevertheless, it is crucial to take into account specific factors including the steel's type and quality, along with the existence of corrosive components in the water, in order to ensure the durability and dependability of the well system. Moreover, adequate insulation and coating might prove necessary to avert corrosion and contamination of the subterranean water source.

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