Cold draw black seamless steel pipe made in China

Cold draw black seamless steel pipe made in China

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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: How are steel pipes recycled at the end of their life cycle?: Steel pipes are typically recycled at the end of their life cycle through a process called steel recycling. This involves collecting the used pipes, separating them from other materials, and then melting them down to be formed into new steel products. The recycling process not only helps conserve valuable resources but also reduces the need for new steel production, making it an environmentally sustainable solution.

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 low thermal expansion coefficient. This allows them to efficiently transfer heat and withstand the expansion and contraction caused by temperature fluctuations without compromising their structural integrity.

Q: How are steel pipes used in the construction of pipelines?: Steel pipes are commonly used in the construction of pipelines due to their high durability, strength, and ability to withstand high pressure. These pipes are used to transport various fluids, such as oil, gas, and water, over long distances. They are welded together and laid underground or submerged to create a reliable and efficient transportation system for these resources.

Q: Are steel pipes resistant to ultraviolet (UV) radiation?: Ultraviolet (UV) radiation poses a threat to steel pipes as they do not possess inherent resistance. This type of radiation has the potential to induce degradation and discoloration in various materials, including steel. However, the extent of harm inflicted depends on several factors, including steel type, duration and intensity of UV exposure, and the presence of protective coatings or finishes on the pipes. Generally, uncoated steel pipes are more vulnerable to UV damage compared to those treated with protective coatings or finishes. Coatings such as epoxy or polyethylene act as a shield against UV radiation, effectively preventing steel degradation and discoloration. Hence, it becomes crucial to consider the specific application and environment when selecting steel pipes and implementing suitable protective measures to ensure their durability and performance.

Q: What are the different types of steel pipe fittings?: There are several types of steel pipe fittings, including elbows, tees, couplings, unions, reducers, caps, plugs, and crosses.

Q: What are the different types of steel pipe joints for underwater applications?: There are various types of steel pipe joints commonly used for underwater applications, including buttweld joints, socket weld joints, and threaded joints. These joints provide secure connections and maintain the integrity of the pipeline system in underwater environments.

Q: What is the difference between ERW and SAW steel pipes?: ERW (Electric Resistance Welded) steel pipes are manufactured by rolling metal sheets into a tube shape and then welding the edges together using an electric current. On the other hand, SAW (Submerged Arc Welded) steel pipes are produced by placing a metal plate in a welding machine with a submerged arc welding process. The key difference lies in the welding technique used, with ERW pipes having a welded seam along the length, while SAW pipes have a more uniform and continuous weld. This difference in welding method also affects the overall strength and durability of the pipes, making them suitable for different applications.

Q: Is there any difference between thermal expansion seamless steel pipe and seamless steel pipe?: Seamless tubes are generally produced on continuous tube mills, also known as automatic rolling mills. The round steel is cut into the required length, centering on the end face of the pipe blank and then sent to the heating furnace to punch on the piercer. At the same time, the hole rotates and advances continuously. Under the action of the roller and the plug, the inner cavity of the pipe blank is gradually formed, and the cavity is called the capillary. Sent to the automatic tube rolling mill on rolling. Finally, the thickness of the whole machine is the same, and the diameter of the sizing machine is determined to meet the specifications.

Q: How do you calculate the maximum allowable deflection for steel pipes?: When calculating the maximum allowable deflection for steel pipes, various factors must be taken into account. These factors include the pipe diameter, material properties, support conditions, and desired level of deflection. The maximum allowable deflection is typically determined according to industry standards and codes. One popular method for calculating the maximum allowable deflection is based on the pipe's span-to-diameter ratio, also known as the L/D ratio. The L/D ratio is calculated by dividing the pipe's span (the distance between supports) by its diameter. Numerous industry codes provide guidelines for the maximum allowable deflection based on the L/D ratio. For instance, the American Society of Mechanical Engineers (ASME) B31.1 Power Piping Code suggests that for carbon steel pipes, the maximum allowable deflection should not exceed 3% of the pipe's span when the L/D ratio is 100 or less. However, as the L/D ratio increases, the deflection limit decreases to ensure the pipe's stability and structural integrity. To calculate the maximum allowable deflection using the L/D ratio method, you first need to determine the L/D ratio based on the pipe's span and diameter. Then, you can refer to the applicable code or standard to find the corresponding maximum allowable deflection limit. It's important to note that other factors, such as the pipe material's yield strength, wall thickness, and the type of loading (e.g., dead load, live load), also influence the maximum allowable deflection. Therefore, it is crucial to consult the relevant industry standards, codes, and engineering principles to accurately calculate the maximum allowable deflection for steel pipes.

Q: What is the hardness of steel pipes?: The specific grade and manufacturing process can cause the hardness of steel pipes to vary. Generally, alloys are used to make steel pipes, which offer a combination of strength and toughness. To determine the hardness of steel pipes, different methods like Rockwell or Brinell hardness tests can be carried out. These tests gauge the steel's resistance to indentation or penetration using a standardized indenter. The hardness of steel pipes is usually represented as a numerical value on a scale, like the Rockwell hardness scale (e.g., HRC or HRB) or the Brinell hardness scale (e.g., HB). The hardness of steel pipes is significant as it indicates their capacity to endure physical stresses, such as pressure, impact, or wear, in various applications such as construction, oil and gas transportation, and manufacturing.

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