Welded and seamless 201 202 304 304L 316 316L stainless steel pipe

Welded and seamless 201 202 304 304L 316 316L stainless steel pipe

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Loading Port:: Shanghai

Payment Terms:: TT OR LC

Min Order Qty:: 5 m.t.

Supply Capability:: 2500 m.t./month

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Material	304:0cr18ni9, 0cr17ni8 201:1cr17mn6ni5n,1cr13mn9ni1n 316:0cr17ni12 or as customer’s request
Size(round pipe)	9.5, 12.7, 15.9, 17, 18, 19.1, 20, 21, 22.2, 23, 25.4, 28, 318, 35, 60, 63.5, 73, 76.2, 88.9, 101.6, 114.3, 127, 133, 59, 168, 219 mm or customized
Size (square pipe)	10×10,12×12,18×18,23×23,38×38,50×50,70×70,100×100,20×10,23×10,24×12,25×13,36×23, 40×20,50×20,60×15,75×45,80×60,95×45,100×60,150×100 mm or customized
Size (oval pipe)	30×15,80×40 mm os customized
Thickness	0.24-3 mm
Length	6m or according to customer’s request
Outer diameter	6.35-219mm
Tolerance	Outer diameter :±0.2mm
Thickness :±0.02mm
Length :±0.5mm
Process method	Code drawn, annealed with nitrogen protection, ultrasonic,automatic shape, polished
Finishing	A: sanded B: 400#-600# mirror C: hairline brushed D: TIN titanlum E : HL brushed & mirror (two kinds of finishing for one pipe)

Chemical Composition
Material	C	Si	Mn	P	S	Cr	Ni
201	≤0.12	≤0.75	9.5-12.5	≤0.045	≤0.03	13-16	0.8-1.5
304	≤0.08	≤0.75	≤2.0	≤0.045	≤0.03	18-19	8-10
316	≤0.08	≤1.00	≤2.0	≤0.035	≤0.03	10-14	16.0-18.5
430	≤0.12	≤0.75	≤2.0	≤0.04	≤0.03	16-18	≤0.6

Company Information

CNBM International Corporation is the most important trading platform of CNBM group.

Whith its advantages, CNBM International are mainly concentrate on Cement, Glass, Iron and Steel, Ceramics industries and devotes herself for supplying high qulity series of refractories as well as technical consultancies and logistics solutions.

WORK SHOP

Client

Export Markets Our target market is the international market. Every year we export most of products to countries like India, Pakistan, South Korea, Brazil, Australia, South Africa, Spain, Sri Lanka, Taiwan, Hong Kong, etc.

F A Q

FAQ

1, Your advantages?

professional products inquiry, products knowledge train (for agents), smooth goods delivery, excellent customer solution proposale

2, Test & Certificate?

SGS test is available, customer inspection before shipping is welcome, third party inspection is no problem

3, Factory or Trading Company?

CNBM is a trading company but we have so many protocol factories and CNBM works as a trading department of these factories. Also CNBM is the holding company of many factories.

4, Payment Terms?

30% TT as deposit and 70% before delivery.

Irrevocable L/C at sight.

Q: What is the difference between seamless and spiral welded stainless steel pipes?: The main difference between seamless and spiral welded stainless steel pipes lies in their manufacturing process. Seamless pipes are formed by piercing a solid billet of stainless steel and then rolling it into a pipe shape, resulting in a continuous and uniform structure. On the other hand, spiral welded pipes are made by rolling a coil of stainless steel into a spiral shape and welding the edges together. This creates a noticeable weld seam along the length of the pipe. While seamless pipes are generally considered to have superior strength and aesthetic appeal due to their uninterrupted structure, spiral welded pipes are often more cost-effective and suitable for applications requiring larger diameters.

Q: What is the difference between seamless and seamless redrawn stainless steel pipes?: Seamless stainless steel pipes and seamless redrawn stainless steel pipes belong to the same category of stainless steel pipes. However, their manufacturing processes and properties differ. Seamless stainless steel pipes are created by piercing a solid stainless steel billet and then using methods like hot rolling, cold rolling, or extrusion to transform it into a seamless tube. This process ensures that the pipe is continuous and free from any welding or joining of separate pieces. As a result, seamless pipes are known for their exceptional strength, durability, and resistance to corrosion. On the other hand, seamless redrawn stainless steel pipes are produced by subjecting a seamless pipe to a secondary process known as cold drawing or cold rolling. This process involves pulling the pipe through a die or a series of dies to reduce its diameter and enhance its surface finish. The cold drawing process significantly improves the dimensional accuracy, surface finish, and mechanical properties of the pipe. The primary distinction between seamless and seamless redrawn stainless steel pipes lies in their manufacturing processes and resulting properties. Due to their uninterrupted grain structure and absence of welds, seamless pipes generally exhibit higher strength and corrosion resistance compared to redrawn pipes. Consequently, they are commonly used in applications that require resistance to high pressure, temperature, or corrosion, such as oil and gas pipelines, chemical processing plants, and power generation facilities. Although slightly inferior in terms of strength and corrosion resistance, seamless redrawn stainless steel pipes offer superior dimensional accuracy, surface finish, and tight tolerances. Therefore, they find application in industries like automotive, aerospace, and pharmaceuticals, where precise dimensions and excellent surface quality are of utmost importance. In conclusion, the choice between seamless and seamless redrawn stainless steel pipes depends on the specific requirements of the application, including the desired level of strength, corrosion resistance, dimensional accuracy, and surface finish. Both types of pipes offer advantages, but the decision ultimately depends on the specific needs of the project.

Q: Can stainless steel pipes be insulated with foam?: Yes, stainless steel pipes can be insulated with foam. Foam insulation is commonly used to improve energy efficiency and reduce heat or cold loss in various types of pipes, including stainless steel ones. The foam insulation helps to prevent condensation and provides thermal protection, making it an effective solution for insulating stainless steel pipes.

Q: How do you prevent galling in stainless steel pipes?: Stainless steel pipes often encounter a frustrating problem called galling, or cold welding. If not dealt with properly, this issue can cause damage and even failure. Fortunately, there are several steps that can be taken to prevent galling in stainless steel pipes: 1. Lubrication is key. By applying a suitable lubricant to the threaded connections, the risk of galling can be significantly reduced. Lubricants create a barrier between the mating surfaces, minimizing friction and preventing the metal-to-metal contact that leads to galling. It's important to use a lubricant specifically designed for stainless steel to ensure compatibility and effectiveness. 2. Proper pipe installation is crucial. Over-tightening the connections can increase the risk of galling, so it's important to avoid this. Following the torque specifications recommended by the manufacturer and using a calibrated torque wrench can ensure proper installation without putting excessive stress on the threads. 3. Avoiding the use of dissimilar metals in the joint is important when connecting stainless steel pipes. If dissimilar metals come into contact, galvanic corrosion can occur, leading to galling. However, if it's necessary to use dissimilar metals, isolating gaskets or other insulating materials can be employed to prevent direct contact between the metals. 4. Maintaining a smooth surface finish on the threads can help minimize the risk of galling. Rough or damaged threads can create areas of high friction, increasing the likelihood of galling. Thoroughly inspecting and cleaning the threads before installation can help identify any imperfections that need to be addressed. 5. Material selection is crucial in preventing galling. Choosing the right grade of stainless steel is essential. Certain stainless steel alloys, such as 304 and 316, are more resistant to galling due to their higher nickel content. Consulting with a materials expert or referring to industry standards can help determine the most suitable stainless steel grade for a specific application. By implementing these preventive measures, the risk of galling in stainless steel pipes can be significantly reduced, ensuring the longevity and reliability of the piping system.

Q: Can stainless steel pipes be coated for additional protection?: Stainless steel pipes have the option of being coated to add extra protection. Coatings offer several advantages, including resistance to corrosion, increased durability, and an improved aesthetic appearance. The most frequently used coating for stainless steel pipes is a polymer-based coating that acts as a barrier against external elements and prevents corrosion. Additional protection can also be provided by applying other types of coatings, such as epoxy or zinc coatings, to stainless steel pipes. The choice of coating depends on the specific requirements and environmental conditions the pipes will encounter. By coating stainless steel pipes, their lifespan can be prolonged, and optimal performance can be ensured in various applications, including industrial and residential plumbing systems.

Q: What is the difference between seamless and EFW stainless steel pipes?: Seamless and EFW stainless steel pipes are distinct types of stainless steel pipes with unique characteristics and manufacturing processes. To begin with, seamless stainless steel pipes are produced without any welding seams or joints. They are formed from a solid cylindrical billet, which is heated and stretched over a mandrel to create a hollow tube. This method guarantees consistent wall thickness and a smooth interior surface, making them ideal for applications requiring high pressure, high temperature, or corrosive environments. Due to their seamless construction, these pipes offer enhanced strength and durability. On the contrary, EFW stainless steel pipes are made by using high-frequency electrical current and pressure to weld the edges of two stainless steel sheets or plates together. This fusion welding process results in a continuous seam running along the length of the pipe. EFW pipes are generally used for lower-pressure and lower-temperature applications, such as conveying fluids or gases in industrial settings. One notable difference between seamless and EFW stainless steel pipes lies in their manufacturing complexity. Seamless pipes necessitate more intricate and precise manufacturing techniques, leading to higher production costs compared to EFW pipes. Additionally, the seamless process allows for a wider range of sizes and thicknesses, whereas EFW pipes are typically limited in their size options. Another distinction lies in the availability of grades and alloys. Seamless stainless steel pipes come in a wide range of grades and alloys, providing greater flexibility for specific applications. In contrast, EFW pipes have a more limited selection of available grades and alloys. Regarding mechanical properties, seamless stainless steel pipes generally exhibit superior strength and corrosion resistance compared to EFW pipes. The absence of welds or joints in seamless pipes reduces the risk of weak points that could be susceptible to corrosion or failure. In conclusion, seamless stainless steel pipes are produced without welding seams, offering improved strength, durability, and corrosion resistance. They are suitable for high-pressure, high-temperature, or corrosive applications. Conversely, EFW stainless steel pipes are created by fusing two stainless steel sheets or plates together, making them more suitable for lower-pressure and lower-temperature applications.

Q: Are stainless steel pipes suitable for oil refinery applications?: Yes, stainless steel pipes are highly suitable for oil refinery applications. They offer excellent resistance to corrosion, high temperatures, and aggressive chemicals commonly found in refineries. Stainless steel pipes also have high strength and durability, making them ideal for transporting and storing various petroleum products.

Q: How can the stainless steel tube eliminate stress?: Or artificial stress, method: stresses both ends of the steel pipe fixed by the mold, through high-frequency shocks, so that the internal stress relief of the steel pipe

Q: Are stainless steel pipes suitable for food processing applications?: Yes, stainless steel pipes are highly suitable for food processing applications. This is because stainless steel is resistant to corrosion, easy to clean and sanitize, and does not react with food or alter its taste. Additionally, stainless steel pipes comply with hygiene and safety standards, making them ideal for the food industry.

Q: Can stainless steel pipes be coated with fusion bonded epoxy?: Yes, stainless steel pipes can be coated with fusion bonded epoxy. This coating provides excellent corrosion resistance and improves the durability of the stainless steel pipes.

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