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?: A large amount of words is calculated by weight, less is usually calculated. According to the length between the length and quality of a material is usually a scaling. Steel belongs to the section, with the length of valuation, according to the classification of wall thickness and diameter; round steel belongs to building materials, mostly for the amount of weighing per ton of valuation, a small amount of more than according to the length multiplied by the conversion ratio of weight to that theory. But the latter is the valuation of tons of steel products between the uneven thickness, with uniform proportion will produce larger price difference, so the general price of different manufacturers are not the same, mostly depends on the quality, to a certain extent is to balance the diameter difference.

Q: What is the impact toughness of steel pipes?: The ability of steel pipes to withstand sudden or high-velocity impacts without fracturing or breaking is referred to as their impact toughness. This property measures the material's resistance to cracking when subjected to dynamic loading conditions. The impact toughness of steel pipes is highly significant as it determines their capacity to endure accidental impacts or external forces during transportation, installation, and operation. To evaluate the impact toughness of steel pipes, standardized tests such as the Charpy V-notch test or the Izod test are commonly utilized. These tests involve striking a notched sample of the steel pipe with a pendulum or a falling weight and measuring the amount of energy absorbed by the material until it fractures. The impact toughness is then calculated based on this energy absorption. A high impact toughness is desirable in steel pipes as it signifies a greater ability to absorb energy and resist fracture, making them more resilient to sudden impacts or loading conditions. This characteristic is particularly crucial in applications where steel pipes are exposed to high-stress environments, such as in oil and gas pipelines, automotive components, or structural applications. Several factors can influence the impact toughness of steel pipes, including their chemical composition, heat treatment, and microstructure. For instance, alloying elements like manganese, chromium, and nickel can enhance the impact toughness by promoting the formation of fine-grained microstructures and preventing crack propagation. Similarly, appropriate heat treatment processes like quenching and tempering can optimize the material's microstructure and mechanical properties, thereby improving its impact toughness. In conclusion, the impact toughness of steel pipes is a vital property that determines their ability to withstand sudden or high-velocity impacts. It is evaluated through standardized tests and can be influenced by factors such as chemical composition, heat treatment, and microstructure. A high impact toughness is desirable in steel pipes to ensure their structural integrity and resistance to fracture when subjected to dynamic loading conditions.

Q: How do you prevent steel pipes from rusting?: To prevent steel pipes from rusting, a common method is to apply a protective coating such as paint or epoxy. Additionally, regularly inspecting and maintaining the pipes, promptly repairing any damage or corrosion, and ensuring proper drainage to prevent moisture buildup are essential preventive measures.

Q: What are the different shapes available for steel pipes?: There are several different shapes available for steel pipes, including round, square, rectangular, and oval.

Q: What is the density of steel pipes?: The density of steel pipes varies depending on their composition, but on average, the density of steel pipes is around 7.8 grams per cubic centimeter.

Q: How do you calculate the buoyancy of submerged steel pipes?: In order to calculate the buoyancy of submerged steel pipes, one must take into account Archimedes' buoyancy principle. According to this principle, the force exerted on an object submerged in a fluid is equal to the weight of the fluid displaced by the object. To calculate the buoyant force, it is necessary to determine the volume of fluid displaced by the submerged steel pipe. This can be done by multiplying the cross-sectional area of the pipe by the length of the submerged portion. Next, it is important to ascertain the density of the fluid in which the steel pipe is submerged. This information can be obtained from the properties of the fluid or by referring to known values. Once the volume and density of the fluid have been determined, the weight of the fluid displaced by the submerged pipe can be calculated using the equation: weight = volume × density × acceleration due to gravity. Finally, the buoyant force can be calculated by multiplying the weight of the displaced fluid by the acceleration due to gravity. This will yield the upward force exerted on the submerged steel pipe by the fluid. When accurately calculating the buoyancy of submerged steel pipes, it is crucial to take into account additional factors, such as the weight of the pipe itself, any attached equipment or coatings, and the specific conditions of the fluid in which it is submerged.

Q: How are steel pipes used in plumbing?: Steel pipes are commonly used in plumbing for various applications such as water supply and drainage systems. They provide durability, strength, and resistance to corrosion, making them suitable for both residential and industrial plumbing. Steel pipes can be used for transporting water, gases, and other fluids, and are often connected with fittings and valves to create a reliable and efficient plumbing system.

Q: Can steel pipes be used for drinking water supply?: Yes, steel pipes can be used for drinking water supply. However, it is important to ensure that the pipes are properly coated or lined to prevent corrosion and any potential contamination of the water. Regular maintenance and monitoring are also necessary to ensure the pipes remain in good condition for safe drinking water supply.

Q: Are steel pipes resistant to chemicals and corrosion?: Generally speaking, steel pipes possess a high resistance to chemicals and corrosion. To further enhance this resistance, protective layers such as zinc or epoxy are often applied to steel pipes. These coatings serve as a barrier, preventing direct contact between chemicals and the steel, thus reducing the risk of corrosion. Moreover, steel itself possesses inherent corrosion-resistant properties, making it a suitable material for applications where exposure to chemicals and corrosive elements is common. However, it is worth noting that the level of resistance may vary depending on the specific type of steel, the chosen coating, and the particular chemicals or corrosive substances involved. Therefore, it is advisable to seek advice from experts and carefully consider the specific requirements of the intended application to ensure the appropriate selection of steel and protective measures, thereby maximizing resistance to chemicals and corrosion.

Q: How do you calculate the weight of steel pipes?: To calculate the weight of steel pipes, you can use the formula: weight = volume × density. The volume can be calculated by multiplying the cross-sectional area of the pipe with its length, while the density of steel is typically assumed to be 7850 kilograms per cubic meter.

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