Black Rectangular Hot Rolled Steel Pipe With Good Quanlity

Black Rectangular Hot Rolled Steel Pipe With Good Quanlity System 1

Black Rectangular Hot Rolled Steel Pipe With Good Quanlity

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Loading Port:: China main port

Payment Terms:: TT or LC

Min Order Qty:: 100 m.t.

Supply Capability:: 10000 m.t./month

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1.Quick Details

Thickness:	1.0 - 35 mm	Section Shape:	Square	Outer Diameter:	2020-600600
Place of Origin:	Shandong China (Mainland)	Secondary Or Not:	Non-secondary	Application:	Structure Pipe
Technique:	Cold Rolled	Certification:	CE	Surface Treatment:	oil,paint
Special Pipe:	Thick Wall Pipe	Alloy Or Not:	Non-alloy	Name:	Square Hollow Steel Pipe/Tube
Shape:	Square/Rectangular	Yield Strength:	360-380Mpa	Tensile Strength:	560-580Mpa
Elongation:	24-28%	Bend Test:	Qualified	Impact Value:	V-notch
Grade:	20#,45#,16Mn,A210,St45,Q235,Q345,Q195,Q215,10#-45#,A53-A369,ST35-ST52,Q195-Q345	Standard:	JIS G3465-2006,JIS G3466,GB/T 3094

2.Specifications

1. OD:15X15-800X800MM,20X30--600X800MM

2. Thick.:1.0--35.0MM

3.FAQ of Rectangular Steel Tube

①How is the quality of your products?
Our products are manufactured strictly according to national and internaional standard, and we take a test
on every pipe before delivered out.

②How about price?
Yes, we are factory and be able to give you lowest price below market one, and we have a policy that “ for saving time and absolutely honest business attitude, we quote as lowest as possible for any customer, and discount can be given according to quantity”,if you like bargain and factory price is not low enough as you think, just don’t waste your time.Please trust the quotation we would give you, it is professional one.

③Why should you chose us?
SGS test is available, customer inspection before shipping is welcome, third party inspection is no problem.

If you have any question, pls feel free to contact us !

4.Rectangular Hot Rolled Steel Tube Image

Black Rectangular Hot Rolled Steel Pipe With Good Quanlity

Q:How are steel pipes protected against mechanical damage?: Steel pipes are protected against mechanical damage through various methods, including the use of protective coatings such as epoxy or polyethylene, wrapping the pipes with tapes or wraps, and installing impact-resistant guards or sleeves. These measures help to safeguard the pipes from external forces, such as impacts or abrasions, ensuring their structural integrity and longevity.

Q:How do steel pipes perform in high-temperature environments?: Steel pipes perform well in high-temperature environments due to their inherent strength and heat resistance. They can withstand extreme temperatures without losing their structural integrity or deforming, making them suitable for various industrial applications such as steam pipelines, power plants, and refineries. The high melting point of steel allows it to maintain its mechanical properties even at elevated temperatures, ensuring reliable and efficient operation in high-temperature environments.

Q:What is the difference between hot-dip galvanizing and electroplating of steel pipes?: Steel pipes can be protected from corrosion using two different methods: hot-dip galvanizing and electroplating. To protect steel pipes using hot-dip galvanizing, they are immersed in a molten bath of zinc. The zinc reacts with the steel to create a strong and uniform coating that effectively prevents corrosion. This method is commonly used for outdoor applications and in harsh environments where the pipes are exposed to water or chemicals. In contrast, electroplating involves depositing a thin layer of metal, usually zinc, onto the surface of the steel pipes using an electric current. The steel pipes act as the cathode, and a zinc anode is placed in a solution containing zinc ions. The electric current causes the zinc ions to react with the steel and form a thin coating. Electroplating is often chosen for indoor applications or when aesthetics are a priority. Hot-dip galvanizing generally provides a thicker and more durable coating compared to electroplating. The hot-dip galvanized coating is several times thicker than the electroplated zinc coating, offering better corrosion protection and a longer lifespan for the pipes. The appearance of the coatings also differs. Hot-dip galvanizing results in a matte gray finish, while electroplating can give a more lustrous and shiny appearance. Cost-wise, hot-dip galvanizing is more cost-effective for larger projects because it can coat multiple pipes simultaneously. On the other hand, electroplating is usually more expensive and time-consuming, especially for larger quantities of steel pipes. Ultimately, the choice between hot-dip galvanizing and electroplating depends on the specific requirements of the project, including the intended application, environment, aesthetics, and budget constraints.

Q:How are steel pipes used in the manufacturing of structural frameworks?: Steel pipes are commonly used in the manufacturing of structural frameworks due to their strength, durability, and versatility. They provide a reliable means of connecting and supporting various components, allowing for the creation of robust and stable structures. Steel pipes are often used as columns, beams, and braces, providing essential support and stability to buildings, bridges, and other infrastructure projects. Additionally, steel pipes can be easily customized and fabricated to meet specific design requirements, making them a popular choice in the construction industry.

Q:How do you calculate the pipe pressure loss coefficient for steel pipes?: To calculate the pipe pressure loss coefficient for steel pipes, you can use the Darcy-Weisbach equation, which is a widely accepted method for determining the pressure loss in pipes due to friction. The equation is as follows: ΔP = f × (L/D) × (V^2/2g) Where: - ΔP is the pressure loss (in units of pressure, such as psi or Pa) - f is the Darcy friction factor (dimensionless) - L is the length of the pipe (in units of length, such as feet or meters) - D is the diameter of the pipe (in units of length, such as feet or meters) - V is the velocity of the fluid flowing through the pipe (in units of velocity, such as ft/s or m/s) - g is the acceleration due to gravity (in units of acceleration, such as ft/s² or m/s²) The Darcy friction factor (f) is a dimensionless parameter that represents the amount of frictional resistance in the pipe. For steel pipes, the friction factor can be determined using the Moody diagram, which is a graphical representation of the relationship between the Reynolds number (Re) and the friction factor (f) for different pipe roughness. To calculate the pressure loss coefficient, you need to find the value of the friction factor (f) based on the Reynolds number (Re) and the relative roughness of the steel pipe (ε/D). The Reynolds number is given by: Re = (ρ × V × D) / μ Where: - ρ is the density of the fluid (in units of mass per unit volume, such as lb/ft³ or kg/m³) - V is the velocity of the fluid (in units of velocity, such as ft/s or m/s) - D is the diameter of the pipe (in units of length, such as feet or meters) - μ is the dynamic viscosity of the fluid (in units of force per unit area per unit time, such as lb/ft·s or kg/m·s) Once you have the Reynolds number (Re) and the relative roughness (ε/D), you can use the Moody diagram to find the corresponding friction factor (f). The pressure loss coefficient (K) can then be calculated as: K = f × (L/D) Where: - L is the length of the pipe (in units of length, such as feet or meters) - D is the diameter of the pipe (in units of length, such as feet or meters) By using the Darcy-Weisbach equation and the Moody diagram, you can accurately calculate the pressure loss coefficient for steel pipes, which is essential for designing and analyzing fluid flow systems.

Q:How do steel pipes perform in extreme temperature variations?: Steel pipes perform well in extreme temperature variations due to their high thermal conductivity and resistance to expansion and contraction. They are able to withstand both high and low temperatures without losing their structural integrity or experiencing significant changes in dimensions. This makes steel pipes suitable for a wide range of applications, including those in industries with extreme temperature conditions, such as oil and gas, chemical processing, and power generation.

Q:What is the difference between hot-finished and cold-finished steel pipes?: Hot-finished steel pipes are produced by heating the steel to a high temperature and then passing it through a series of rollers to give it the desired shape and size. This process results in a smooth surface finish and improved mechanical properties. On the other hand, cold-finished steel pipes are produced by cold drawing the steel through a die, resulting in a smaller diameter and improved dimensional accuracy. Cold-finished pipes have a smoother surface finish and tighter tolerances compared to hot-finished pipes.

Q:Are steel pipes suitable for underground nuclear waste storage?: Yes, steel pipes are suitable for underground nuclear waste storage. Steel pipes are known for their durability, strength, and resistance to corrosion, making them an ideal choice for safely containing and transporting nuclear waste underground. Additionally, steel pipes can withstand the high pressures and temperatures associated with nuclear waste, ensuring the integrity of the storage system.

Q:What are the advantages of using steel pipes in the manufacturing industry?: There are several advantages of using steel pipes in the manufacturing industry. Firstly, steel pipes are known for their strength and durability, making them suitable for handling heavy loads and withstanding high pressures. Secondly, steel pipes have excellent corrosion resistance, which ensures a longer lifespan and reduces the need for frequent replacements. Additionally, steel pipes offer a smooth interior surface, allowing for efficient fluid flow and minimizing friction losses. They are also highly versatile, as they can be easily fabricated and customized to meet specific requirements. Finally, steel pipes are environmentally friendly, as they are recyclable and contribute to sustainable manufacturing practices.

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