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: Are steel tubes and round steel in weight or length when purchased?: The price must be measured by weight, and the length, volume and other specifications should be entered

Q: How are steel pipes threaded for easy installation?: The process of threading steel pipes enables convenient installation by creating grooves or ridges in the pipe, forming a spiral pattern that facilitates connection with other threaded components like fittings or valves. There are two commonly employed methods for threading steel pipes: manual threading and machine threading. Manual threading involves the utilization of a handheld tool called a pipe die. This die, equipped with sharp teeth, cuts into the pipe while it is rotated. The pipe is secured in a vise or held firmly by hand, and the die is applied to the pipe's end. As the die rotates around the pipe, threaded grooves are formed. Executing this process necessitates skill and precision to ensure accurate and properly aligned threads. In contrast, machine threading is a more automated procedure. It utilizes a pipe threading machine, which possesses a die head that automatically cuts the threads into the pipe. The machine holds the pipe securely and rotates it while the die head moves along the pipe's length, creating the threads. Machine threading is faster and more efficient than manual threading, making it ideal for large-scale production or projects. Regardless of the chosen method, it is imperative to ensure that the threads are clean and devoid of debris or burrs. This is crucial for effortless installation and to prevent leaks or other complications. Following threading, the pipes are generally inspected to ensure compliance with the required specifications. Threading steel pipes allows for uncomplicated installation as the threaded ends can be readily screwed into fittings, valves, or other pipes possessing compatible threads. This threaded connection creates a tight seal, rendering it suitable for various applications such as plumbing, gas lines, or industrial piping systems.

Q: Can steel pipes be used for wastewater systems?: Certainly, wastewater systems can indeed utilize steel pipes. Due to their impressive durability, strength, and resistance to corrosion, steel pipes have gained widespread popularity in wastewater systems. They possess the capacity to endure high pressure and effectively convey wastewater over extensive distances. Furthermore, steel pipes offer the advantage of ease in welding, allowing for the creation of a seamless pipeline system that minimizes the risk of leakage. Additionally, steel pipes demonstrate environmental friendliness as they can be recycled, rendering them a sustainable choice for wastewater systems. Nevertheless, it remains crucial to take into account the specific requirements of the wastewater system and seek guidance from experts to determine the most suitable material for the project.

Q: What is the difference between seamless and ERW steel pipes?: Seamless steel pipes are made without any welded joints, resulting in a uniform and continuous structure. On the other hand, ERW (Electric Resistance Welded) steel pipes are created by welding the edges of the steel strip or coil together, forming a seam. This seam may be visible on the surface of the pipe. While seamless pipes are considered stronger and more reliable due to their uniform structure, ERW pipes are more cost-effective and commonly used for low to medium pressure applications.

Q: How are steel pipes protected during transportation and storage?: Steel pipes are usually protected during transportation and storage through various measures such as coating them with anti-corrosion materials, wrapping them with protective films or tapes, using wooden crates or pallets for stacking and securing them with straps or bands. Additionally, pipes are often stored in covered or climate-controlled warehouses to prevent exposure to moisture and other potential damaging elements.

Q: How do steel pipes connect to other components?: Steel pipes can connect to other components through various methods such as welding, threading, flanges, or mechanical couplings.

Q: What are the factors to consider when selecting pipe materials for corrosive environments?: To ensure the longevity and effectiveness of a piping system in corrosive environments, several important factors must be considered. Firstly, the corrosion resistance of the pipe material is crucial. It is essential to select a material highly resistant to corrosion as time can cause significant damage to pipes in corrosive environments. Stainless steel, fiberglass, PVC, and CPVC are materials known for their excellent corrosion resistance. Secondly, the chemical compatibility of the pipe material with the corrosive environment should be assessed. Different materials have varying resistance levels to different chemicals, so it is important to ensure that the chosen material can withstand the specific chemicals present. Consulting chemical compatibility charts and seeking expert advice can aid in selecting the right material. Furthermore, the temperature and pressure requirements within the corrosive environment should be taken into account. Some materials have limitations in terms of temperature and pressure resistance, exceeding which can lead to pipe failure. It is crucial to choose a material that can handle the required temperature and pressure ranges without compromising its structural integrity. The cost of the pipe material and its installation should also be considered. While certain materials may offer high corrosion resistance, they may also be more expensive. Striking a balance between the desired level of corrosion resistance and the available budget is essential. Lastly, the maintenance requirements and overall durability of the pipe material should be evaluated. Some materials may require more frequent inspections, cleaning, or repairs compared to others. Considering the anticipated lifespan of the piping system and the ease of maintenance can help in selecting a material that ensures long-term reliability and cost-effectiveness. In conclusion, when selecting pipe materials for corrosive environments, it is important to consider factors such as corrosion resistance, chemical compatibility, temperature and pressure requirements, cost, and maintenance and durability. By carefully evaluating these factors, one can choose a pipe material that best suits the specific corrosive environment and ensures a reliable and long-lasting piping system.

Q: What are the different types of steel pipe elbows?: There are several different types of steel pipe elbows, including 45-degree elbows, 90-degree elbows, and 180-degree elbows. These elbows are used to change the direction of the flow in a piping system and are available in various sizes and materials to suit different applications and requirements.

Q: How are steel pipes used in bridge construction?: Steel pipes are commonly used in bridge construction for various purposes. They are often used as piles to provide structural support to the bridge foundation, ensuring stability against soil movement and water pressure. Additionally, steel pipes are used as structural components in the bridge's superstructure, such as for trusses and beams, due to their high strength and durability. Steel pipes also play a crucial role in carrying utilities, such as water and gas pipelines, across the bridge. Overall, steel pipes are an essential element in bridge construction, providing strength, stability, and functionality to the structure.

Q: Are steel pipes resistant to impact or external forces?: Yes, steel pipes are generally resistant to impact and external forces. Steel is known for its high strength and durability, making it an ideal material for various applications, including pipes. Steel pipes have the ability to withstand external forces such as impact, pressure, and vibrations. They are often used in industries that require reliable and sturdy piping systems, such as oil and gas, construction, and infrastructure. Additionally, steel pipes are less prone to cracking or breaking under extreme conditions compared to other materials. However, the resistance to impact and external forces may also depend on the specific grade and thickness of the steel used in the pipes.

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