Seamless hot rolled black steel pipe Gr.B

Seamless hot rolled black steel pipe Gr.B

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Loading Port:: Tianjin

Payment Terms:: TT OR LC

Min Order Qty:: 10 m.t.

Supply Capability:: 10000 m.t./month

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1. Commodity Name: Seamless steel pipe

2. Standard: API,GB,ASTM,ASME,DIN

3. Quality grade: 10#, 20#, A106B, A53B, API 5L B, Q235, Q345, ST37-2, ST 45, ST52.etc.

4. Dimension:

OD: 1/2"-24"

WT: 2.5-80mm, SCH10~SCH40~XXL

length: 5.8m,6m,8m,9m,12m

5. Technique: Hot Rolled/Cold Rolled/ Cold Drawn

6. application

carbon seamless steel pipes are widely used in gas, water and oil, transpotation;constructions;Bridge,highway,windows of model steel door; building materials;fences;heating facilities Fluid Pipe;conduit pipe,scaffolding pipe.etc.

7. Payment Terms: L/C D/A D/P T/T

8.packing and shipment

Packaged in bundles,as per customers' requirements, it can also bepackagesd as beveled ends, typed marking, black painting, plastic caps protection,woven bags packing

For 20" container the max length is 5.8m; For 40" container the max length is 12m. other options are available based on customer requests. Please discuss when placing orders.

9. Surface: painted with varnish;

10. Plastic caps at ends.

11. Tolerance: OD +1%/-1%

WT +12.5%/-10%

12. Chemical composition:

Models of Steel Pipes	Chemical Component
Steel 20 (ASTM A106B)	C	Si	Mn	P	S	Cu	Ni	Cr
Steel 20 (ASTM A106B)	0.17~0.24	0.17~0.37	0.35~0.65	0.035max	0.035max	0.25max	0.25max	0.25max
Steel45 (ASTM 1045)	0.42~0.50	0.17~0.37	0.50~0.80	0.035max	0.035max	0.25max	0.25max	0.25max
16Mn(Q345B)	0.12~0.20	0.20~0.55	1.20~1.60	0.035max	0.035max	0.25max	0.25max	0.25max
45Mn2 ( ASTM1345)	0.42~0.49	0.17~0.37	1.40~1.80	0.035max	0.035max	0.3max	0.3max	0.30max

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.

Q:How do you calculate the pipe pressure drop for steel pipes?: To calculate the pressure drop in steel pipes, you can use the Darcy-Weisbach equation, which takes into account factors such as the pipe diameter, length, roughness, and the fluid flow rate. By plugging these variables into the equation, you can determine the pressure drop experienced by the fluid as it flows through the steel pipe.

Q:How do you determine the required wall thickness for steel pipes?: The required wall thickness for steel pipes is determined by considering various factors such as the internal pressure, external loads, pipe material, and the desired safety factor. This is typically calculated using engineering principles, industry standards, and specific pipe design codes to ensure the pipe can withstand the anticipated conditions without failure or deformations.

Q:What is the difference between steel pipes and copper-nickel pipes?: The main difference between steel pipes and copper-nickel pipes lies in their composition and characteristics. Steel pipes are primarily made of iron and carbon, whereas copper-nickel pipes are made of a combination of copper and nickel with trace amounts of other elements. Steel pipes are known for their strength and durability, making them suitable for a wide range of applications, particularly in industries where high pressure and temperature conditions are present. Steel pipes are also relatively cost-effective and have good corrosion resistance, especially when coated or galvanized. On the other hand, copper-nickel pipes are highly resistant to corrosion and have excellent heat transfer properties. They are commonly used in marine environments due to their resistance to saltwater corrosion. Copper-nickel pipes also exhibit antimicrobial properties, making them suitable for applications in healthcare and food processing industries. However, copper-nickel pipes are generally more expensive than steel pipes. In summary, steel pipes are valued for their strength and affordability, while copper-nickel pipes offer superior corrosion resistance and heat transfer properties, but at a higher cost. The choice between the two depends on the specific requirements of the application.

Q:How are steel pipes specified in engineering drawings?: Steel pipes are specified in engineering drawings by providing information such as the diameter, thickness, material grade, length, and any additional specifications or requirements such as the type of coating or threading needed.

Q:How are steel pipes protected against microbial corrosion?: Various methods are employed to safeguard steel pipes against microbial corrosion. One widely used technique entails applying coatings onto the surface of the pipes. These coatings act as a shield, effectively blocking the entry of microbes and their corrosive byproducts into the steel, thereby safeguarding it from degradation. Coatings like epoxy, polyethylene, and fusion bonded epoxy are frequently utilized to bestow this protection. Another method involves the use of corrosion inhibitors. These inhibitors are added to the fluid that flows through the pipes in order to impede microbial growth and prevent corrosion. They can be either organic or inorganic compounds that function by either eradicating the microbes or inhibiting their metabolic activity. Furthermore, ensuring proper maintenance and cleaning of the pipes is vital in preventing microbial corrosion. Regular inspections and cleaning routines aid in the elimination of any biofilms or microbial deposits that may have formed on the pipe's surface. This significantly reduces the likelihood of microbial corrosion and prolongs the lifespan of the pipes. In certain cases, cathodic protection may also be employed. This method entails utilizing sacrificial anodes or impressed current systems to supply a protective electrical current to the pipe. This current helps prevent the formation of corrosive microorganisms and shields the steel from corrosion. In summary, a combination of coatings, corrosion inhibitors, regular maintenance, and cathodic protection techniques are employed to protect steel pipes from microbial corrosion. By utilizing these strategies, the longevity and integrity of the pipes are ensured, benefiting various industries such as oil and gas, water supply, and sewage systems.

Q:How are steel pipes used in the manufacturing of chemical storage tanks?: Steel pipes are used in the manufacturing of chemical storage tanks for their durability, strength, and resistance to corrosion. These pipes are utilized for the construction of the tank's framework, as well as for the transport of chemicals within the tank. The steel pipes provide a reliable and secure infrastructure, ensuring the safety and integrity of the chemicals stored inside the tank.

Q:How are steel pipes used in the construction of nuclear power plants?: Steel pipes are used in the construction of nuclear power plants for various purposes, such as transporting and containing fluids and gases, including coolant, steam, and compressed air. They are specifically chosen for their high strength, durability, and resistance to heat and pressure. Steel pipes are used in the construction of primary and secondary cooling systems, reactor vessels, and other critical components, ensuring the safe and efficient operation of nuclear power plants.

Q:Can steel pipes be used for the construction of tunnels?: Yes, steel pipes can be used for the construction of tunnels. Steel pipes are commonly used in tunnel construction for various purposes such as drainage, ventilation, and utility installations. They are strong, durable, and can withstand high pressures and loads, making them suitable for tunnel applications. Additionally, steel pipes can be easily fabricated, installed, and maintained, making them a popular choice in tunnel construction projects.

Q:Can steel pipes be used for oil drilling operations?: Yes, steel pipes are commonly used for oil drilling operations due to their strength, durability, and ability to withstand high pressure and corrosive environments.

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