Name: China Stainless Steel Welded Tube Suppliers, Manufacturers, Factory - Wholesale Price - Torich
Brand: Torich
SKU: 236700379

Your Professional Stainless Steel Welded Tube Supplier

Torich International Limited is a professional manufacturer and exporter of steel pipes materials.

It is an international marketing and sales company specialized in steel tubes, which holds the factories of Seamless Steel Tubes with Carbon and Alloy Steel Grade, Welded Precision Steel Tubes,DOM Steel Tubes, Seamless & Welded Stainless Steel Tubes with Nickel and Alloy Steel Grade.

Why Choose Us?

One-stop Solution

A professional steel pipes manufacturer and solution provider. Our aim is to provide ONE-STOP supply service for our customers with demand of: Steel Tubes/Pipes and Steel Tube/Pipe related products.

Complete Range Of Products

Torich International Limited is an international marketing and sales company specialized in steel tubes, which holds the factories of Seamless Steel Tubes with Carbon and Alloy Steel Grade, Welded Precision Steel Tubes,DOM Steel Tubes, Seamless & Welded Stainless Steel Tubes with Nickel and Alloy Steel Grade.

Quality Contoral

100% prompt delivery in the past 3 years. 100% dimensional check and 100% visual inspection on tube surfaces. 100% eddy current test and ultrasonic test for detecting longitudinal and transversal defects.

Corporate Culture

We focus on Quality First, Quality Traceability, and Quality Stability! We focus on Customer First, People First, and Quality-Oriented!

ASTM A312 TP304 316 Heavy Wall Seamless Stainless Steel Tube

Oil & Gas : Platform accomodation, cable trys, subsea pipelines etc
Water : Water and sewage treatment, water tubing, hot water tankers etc
Medical : Surgical instruments, surgical implanets, MRI scanners etc

Sa 312 316l Thick Wall Seamless Stainless Steel Tube

Widely used in petroleum,foodstuff,chemical industry,construction, electric power,nuclear,energy,machinery,biotechnology,paper making, shipbuilding,boiler fields.

Stainless Steel Sanitary Tubing ASTM A270 Tp304 TP316L

Thickness Tolerance:+/-10%
Length:5.8meter or 6meter or customized
Length Tolerance:+/-8mm

Sa 213 Tp321 316l Stainless Steel U Tube

Steel:Grade200 series,300 series
Surface:Polishing,annealing,pickling,bright
Package:Standard export seaworthy package,or as required.

ASTM A269 Tp304 Tp316 Seamless Ss Tubing

The ASTM A269 Tp304 Tp316 seamless stainless steel (SS) tubing is made from high-quality raw materials, ensuring durability and excellent performance in various applications. This tubing is commonly used in industries such as chemical, petrochemical, oil and gas, food processing, and many others.

SA312 TP321 321H Stainless Steel Pipe

Stainless steel is a versatile and widely used material in various industries. It is renowned for its excellent corrosion resistance, high strength, and durability. SA312 TP321 and 321H stainless steel pipes are specifically designed for applications that require resistance to high temperatures and corrosive environments.

Astm A312 Tp316 316l 316ti Seamless Stainless Steel Pipe

The ASTM A312 TP316, TP316L, and TP316Ti are seamless stainless steel pipes. These pipes are commonly used in various industries due to their excellent corrosion resistance and high strength.

SA 249 TP304 TP316L Seamless Stainless Steel Pipe

Outer Diameter: 12-76.2mm
Wall Thickness: 0.5mm-3.0mm
Length: As request

Precision Seamless Stainless Steel Tube

Material, Specification, Key Features
Material: Stainless Steel (Grade 310S)
Specification: Seamless Tube

What Is Stainless Steel Welded Tube

Stainless steel welded tube is a tube that is made up of stainless steel and is produced by welding procedure. There are different types of stainless steel such as Austenitic, Frritic, Martensitic and duplex. These pipes have different crystalline structures and different mechanical properties.

Advantages of Stainless Steel Welded Tube

Corrosion resistance

Corrosion is one of the significant problems that traditional metals like iron and copper face. It happens due to exposure to air, moisture, and chemicals. The use of stainless steel welded tubes offers excellent corrosion resistance due to their high chromium content. Chromium components react with oxygen to produce a thin, invisible layer of chromium oxide that prevents rusting and corrosion. The layer can self-heal, offering long-lasting protection against corrosion. Therefore, stainless steel is the best material for durability and longevity in areas with the potential for chemical exposure, humidity, or moisture.

High strength and toughness

During manufacturing, tubes undergo mechanical work that reduces the number of vulnerabilities in the metal structure. As a result, it can withstand stress, pressure, and wear and tear over time. Whether within a building foundation, roof, or structure frame, stainless steel welded tubes add significant structural strength to any project design.

Aesthetically pleasing

Stainless steel welded tubes are stylish and elegant. They give buildings a modern and sleek appearance. They are incredibly versatile because they come in various shapes and sizes. This feature makes stainless steel tubes suitable for a range of buildings and construction projects. These tubes can retain their beauty even when exposed to harsh environmental conditions. So, architects and engineers can use them to bring their creative designs to life.

Cost-effective

Compared to traditional materials like copper, stainless steel welded tubes are cost-effective. They offer benefits such as durability, corrosion resistance, and strength with lower maintenance costs than copper and iron. They require less repair, replacement, and maintenance over their lifetime. This helps retain the building's infrastructure and overall look, saving significant construction costs in the long run.

Common Applications for Stainless Steel Welded Tube

Stainless steel welded tube is used in a wide range of industries and applications. Some of the most common applications include:

Industrial And Chemical Processing
Stainless steel welded tube is widely used in industrial and chemical processing plants due to its corrosion resistance and durability. It is used to transport various chemicals, gasses, and liquids, including corrosive and high-temperature substances.
In chemical processing plants, stainless steel welded tube is used for its resistance to corrosion and chemical reactions. Stainless steel pipe can withstand exposure to harsh chemicals and maintain its structural integrity, making it a reliable choice for transporting hazardous materials.

Oil And Gas Industry
The oil and gas industry relies heavily on stainless steel welded tube for its pipelines and equipment. Stainless steel is resistant to corrosion and can withstand high pressures and temperatures, making it suitable for transporting oil and gas over long distances.
Stainless steel welded tube is also used in refineries and petrochemical plants for its resistance to corrosive substances and high temperatures. It is a cost-effective choice for these industries, as it requires minimal maintenance and has a long lifespan.

Food And Beverage Industry
Stainless steel welded tube is a popular choice in the food and beverage industry due to its hygienic properties. It is non-porous, making it resistant to bacteria and easy to clean. This makes it suitable for transporting food and beverages, as well as for use in food processing and packaging.
In the food and beverage industry, stainless steel welded tube is also used for its resistance to corrosion and chemical reactions. It can withstand exposure to acidic and alkaline substances, making it a reliable choice for food and beverage processing.

Water And Wastewater Treatment
Stainless steel welded tube is commonly used in water and wastewater treatment plants due to its corrosion resistance and durability. It is used for transporting both clean and wastewater, as well as for various treatment processes.
In water treatment plants, stainless steel welded tube is used for its resistance to corrosion and chemical reactions. It can withstand exposure to chlorine, chloramines, and other chemicals used in the treatment process. In wastewater treatment plants, stainless steel welded tube is used for its durability and ability to withstand high pressures and temperatures.

Construction And Architecture
Stainless steel welded tube is a popular choice in construction and architecture for its strength, durability, and aesthetic appeal. It is commonly used for structural support, such as in building frames and bridges, as well as for decorative purposes, such as handrails and balustrades.
In construction and architecture, stainless steel welded tube is also used for its resistance to corrosion and weathering. It can withstand exposure to harsh outdoor conditions, making it a reliable choice for outdoor structures.

Automotive And Transportation
Stainless steel welded tube is used in the automotive and transportation industries for its strength, durability, and resistance to corrosion. It is commonly used for exhaust systems, as well as for fuel and brake lines.
In the automotive industry, stainless steel welded tube is also used for its ability to withstand high temperatures and pressures. It is a reliable choice for high-performance vehicles and heavy-duty trucks.

304 Vs 316 Stainless Steel Welded Tube: Heat Resistance

Heat resistance is an important factor to consider when comparing the different grades of stainless steel. The melting range of 304 is around 50 to 100 degrees Fahrenheit higher than 316. Although the melting range of 304 is higher than 316, they both have good resistance to oxidization in intermittent service up to 870°C (1500℉) and in continuous service at 925°C (1697℉).

304 SS: Handles high heat well, but continuous use at 425-860 °C (797-1580 °F) may cause corrosion.

316 SS: Performs best in temperatures above 843 ℃ (1550 ℉) and below 454 ℃ (850°F)

Equivalent Material of Stainless Steel Welded Tube

STANDARD	WERKSTOFF NR.	UNS	JIS	BS	GOST	AFNOR	EN
SS 304	1.4301	S30400	SUS 304	304S31	08Х18Н10	Z7CN18‐09	X5CrNi18-10
SS 304L	1.4306 / 1.4307	S30403	SUS 304L	3304S11	03Х18Н11	Z3CN18‐10	X2CrNi18-9 / X2CrNi19-11
SS 304H	1.4301	S30409	–	–	–	–	–
SS 310	1.4841	S31000	SUS 310	310S24	20Ch25N20S2	–	X15CrNi25-20
SS 310S	1.4845	S31008	SUS 310S	310S16	20Ch23N18	–	X8CrNi25-21
SS 310H	–	S31009	–	–	–	–	–
SS 316	1.4401 / 1.4436	S31600	SUS 316	316S31 / 316S33	–	Z7CND17‐11‐02	X5CrNiMo17-12-2 / X3CrNiMo17-13-3
SS 316L	1.4404 / 1.4435	S31603	SUS 316L	316S11 / 316S13	03Ch17N14M3 / 03Ch17N14M2	Z3CND17‐11‐02 / Z3CND18‐14‐03	X2CrNiMo17-12-2 / X2CrNiMo18-14-3
SS 316H	1.4401	S31609	–	–	–	–	–
SS 316Ti	1.4571	S31635	SUS 316Ti	320S31	08Ch17N13M2T	Z6CNDT17‐123	X6CrNiMoTi17-12-2
SS 317	1.4449	S31700	SUS 317	–	–	–	–
SS 317L	1.4438	S31703	SUS 317L	–	–	–	X2CrNiMo18-15-4
SS 321	1.4541	S32100	SUS 321	–	–	–	X6CrNiTi18-10
SS 321H	1.4878	S32109	SUS 321H	–	–	–	X12CrNiTi18-9
SS 347	1.4550	S34700	SUS 347	–	08Ch18N12B	–	X6CrNiNb18-10
SS 347H	1.4961	S34709	SUS 347H	–	–	–	X6CrNiNb18-12
SS 904L	1.4539	N08904	SUS 904L	904S13	STS 317J5L	Z2 NCDU 25-20	X1NiCrMoCu25-20-5

Types of Stainless Steel Welded Tube

Several types of stainless steel welded tube are available in the market, and each type is optimize for specific applications. Some of the most common types include:

Austenitic stainless steel pipes

These pipes are made from high-grade austenitic stainless steel materials and are perfect for applications requiring excellent corrosion resistance.

Duplex stainless steel pipes

These pipes are design to withstand high pressure, high temperature, and corrosive environments.

Ferritic stainless steel pipes

These pipes are produce from ferritic stainless steel materials and are ideal for applications requiring high-temperature resistance and excellent mechanical properties.

Martensitic stainless steel pipes

These pipes are made from stainless steel materials and are perfect for applications requiring high strength and excellent wear resistance.

The Process of Manufacturing Stainless Steel Welded Tube

The Rolling And Welding Stage
To begin our process, we first need to go through the rolling and welding stage. The stainless steel is placed through a checking process and cut at the edges in this stage. The stainless steel is pushed through and morphed into its required tubular size with a rolling machine. After being pressed and turned through the rolling machine, the edges are welded through a heating process called TIG. The welding process joins the rolled metals together using an electric arc that has a built-in electrode.

Cleaning And Warming Stage
In this stage, steel tubes are lined up on a fabricator and cut to a required length before heading to the following process. The cleaning in this stage helps remove dirt from the pipes, and then once treated with heat, the rolled pipes and tubes are stripped of any stresses that can come up in the welding and formation process. The heat treatment given to stainless steel welded tube is done with a furnace-the furnace is actually equipped with temperature recorders and controllers, as this can help tremendously with containing temperature and controlling the way stainless steel is cured. After heating is finished, the stainless steel welded tube are taken through a pickling segment where they're straightened out, and scales are removed from its surface.

Cold-drawing Stage
Sometimes, the required size isn't obtained when the steel is brought through the mill directly. When using the cold-drawing process, the desired size is achieved when the pipes and tubing are coated with oxalic and soap solution and dragged over die plugs-the oxalic and soap solution help reduce friction when going through the cold cycle.

The Finishing Process
The final process is the finisher. Once the process of manufacturing stainless steel welded tube is completed, you'll now have to take them to a jet printer. The tubes are taken through, piece by piece, and marked with their grade of material, size, heat number, and third-party inspection stamp before being passed onto exporters. After everything is engraved, the pipes are taken through testing for quality and other checks. Finally, everything is packed and dispatched.

Surface Treatment Method of Stainless Steel Welded Tube

The surface treatment of stainless steel welded tubes is crucial for enhancing their appearance, corrosion resistance, and overall durability. Several common methods are employed for surface treatment of stainless steel welded tubes.

Pickling:
This process involves the use of an acid solution, usually a mixture of nitric and hydrofluoric acid, to remove scales, oxides, and other impurities from the surface of the stainless steel welded tube. Pickling leaves the surface clean and corrosion-resistant.

Passivation:
Passivation is the process of treating stainless steel with an oxidizing acid solution to remove any free iron from the surface and enhance the formation of a protective oxide layer. This helps in preventing corrosion and improves the overall corrosion resistance of the stainless steel.

Electropolishing:
Electropolishing is an electrochemical process that removes a thin layer of material from the stainless steel surface, resulting in a smooth, shiny finish. This process not only improves the aesthetics but also enhances corrosion resistance by removing embedded contaminants.

Grinding And Polishing:
Mechanical processes like grinding and polishing are used to achieve specific surface finishes on stainless steel welded tubes. This can range from a coarse abrasive finish to a mirror-like polish, depending on the desired application.

Blasting:
Stainless steel welded tubes can undergo abrasive blasting using materials like glass beads, aluminum oxide, or stainless steel shot. This process removes surface contaminants and imparts a uniform matte finish.

Coating:
Coating methods, such as painting or powder coating, can be applied to the surface of stainless steel welded tubes for decorative purposes or to provide additional corrosion resistance. However, this is more common in non-industrial applications.

Heat Coloring:
Controlled heating of the stainless steel surface can produce a range of colors through the formation of a thin oxide layer. This method is often used for decorative purposes and does not compromise the corrosion resistance of the material.

Pickling And Passivation Combined:
Some processes combine pickling and passivation to achieve a comprehensive surface treatment that removes impurities and enhances the corrosion resistance of stainless steel.

How To Choose Stainless Steel Welded Pipe

Factors to consider when choosing stainless steel welded pipe

● Material Grade: There are different grades of stainless steel pipe, such as 304, 316 and duplex pipe stainless steel, each with its own unique properties and applications.

● Pipe Size: Pipe size will affect the flow rate and pressure rating.

● Wall Thickness: The thickness of the pipe wall will affect the strength and durability of the pipe.

● Surface Treatment: Different surface treatments, such as polishing or brushing, will affect the appearance and corrosion resistance of stainless steel welded pipe.

● Weld Quality: Weld quality is crucial to ensure the strength and tightness of the pipeline.

● Corrosion Resistance: Stainless steel is known for its corrosion resistance, but different grades have different levels of corrosion resistance. 316 stainless steel is more corrosion resistant than 304 stainless steel.

● Temperature Resistance: Certain grades of stainless steel are better suited for high temperature applications. For example, 309 and 310 stainless steel have higher temperature resistance than 304 stainless steel.

● Bendability: Some grades of stainless steel are more bendable than others. For example, 304 stainless steel is more bendable than 316 stainless steel.

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FAQ

Q: What is stainless steel welded tube used for?

A: Stainless steel welded tube resists oxidation, making it a low-maintenance solution that is suitable for high temperature and chemical applications. Because it is easily cleaned and sanitized, stainless steel pipe is also desired for applications involving food, beverages, and pharmaceutical applications.

Q: Can stainless steel welded tubes be used for 50 years?

A: The strength of stainless steel welded tubes is 3 times that of copper pipes and 8-10 times that of PPR pipes. It can withstand the impact of high-speed water flow of 30 meters per second. You no longer have to worry about being broken by nails, electric drills, etc. Not afraid of heavy objects, wear-resistant, vibration-resistant, impact-resistant, non-explosion, fire-proof, earthquake-resistant, and good sealing performance. Therefore, 50 years is only a conservative estimate, and the building can be maintained and updated during its life cycle.

Q: What is the most common stainless steel for pipes?

A: For tubing and piping applications, type 304 stainless steel is a common selection because it is highly chemical- and corrosion-resistant.

Q: What stainless steel welded tube is best for welding?

A: Austenitic. This class of stainless steel is highly corrosion-resistant, strong, and highly formable. But it is also prone to stress cracking. These are considered the most easily weldable stainless steel.

Q: What is the difference between 304 and 316 SS stainless steel welded tube?

A: The key difference between 304 and 316 stainless steel that makes them different is the addition of molybdenum, an alloy that drastically enhances corrosion resistance, especially for more saline or chloride-exposed environments. 316 stainless steel contains molybdenum, but 304 does not.

Q: Is 316L stainless steel welded tube weldable?

A: 316L stainless steel is weld friendly. You can weld it to other steels or metals without issue, and form what shapes you need for your project. On the other hand, 316 stainless steel is susceptible to weld decay. This means the welded area can be more vulnerable to corrosion, weakening the bond of the weld.

Q: How can you tell if its 316 or 304 stainless steel welded tube?

A: 316 contains many similar chemical and mechanical properties as 304 stainless steel. To the naked eye, the two metals look the same. However, the chemical composition of 316, which is made up of 16% chromium, 10% nickel, and 2% molybdenum, is the main difference between 304 and 316 stainless steel.

Q: What is the best way to weld stainless steel pipe?

A: TIG welding or gas tungsten arc welding. Offering high quality, versatility and longevity, TIG is the most commonly used stainless steel welding process. This welding process creates a low heat input, which makes it perfect for thin material.

Q: What polarity do you weld stainless steel?

A: Polarity refers to the direction of current flow when welding. All DC TIG welding (steel, stainless, etc) is done on DC- polarity where the TIG torch is connected to the negative (-) terminal and the earth lead to the positive (+) terminal.

Q: What are the benefits of stainless steel tubing?

A: Thanks to its corrosion resistance, fire and heat resistance, hygiene, aesthetic appeal, strength-to-weight advantage, ease of fabrication, and impact resistance, stainless steel tubing has been widely used across industries for decades.

Q: How is stainless steel welded tube made?

A: Stainless steel welded tube is made from a flat steel strip, usually slit from a coil. This strip is pushed through a series of rollers, bending the strip into a round tube shape. Finally the ends of the strip are welded together, often by ERW technology (Electric Resistance Welding). This is a form of pressure welding which utilizes heat generated by electrical resistance of the material. No extra welding material is added. Welded pipes are cut to fix lengths, usually 6 or 12 m.

Q: What process is commonly used for stainless steel welded tube?

A: Offering high quality, versatility and longevity, TIG is the most commonly used stainless steel welding process. This welding process creates a low heat input, which makes it perfect for thin material.

Q: Can stainless steel welded tube be welded?

A: Welded tubing is produced by rolling strips of stainless steel into a tube and then welding along its full length. After welding, the weld seam, or bead, can be refined by cold rolling and forging methods or left as is.

Q: What is the best way to stainless steel welded tube?

A: Although there are many ways to weld stainless steel, only three are the most commonly used. These stainless steel welding methods are TIG welding, resistance welding, and MIG welding. TIG is the most commonly used stainless steel welding process, featuring high quality, versatility, and long service life.

Q: What happens when you stainless steel welded tube too hot?

A: This makes it resistant to rust when it's welded properly. Stainless steel is also more sensitive to heat input than mild steel is. Too much heat for too long can result in carbide precipitation - which causes the material to lose its corrosion resistance.

Q: How do you stop distortion when stainless steel welded tube?

A: Use as few weld passes as possible – Filling the same volume with fewer weld passes reduces shrinkage stresses and angular distortion, as the shrinkage effect of each pass is cumulative. So, by using larger electrodes – instead of many passes with thinner electrodes –is possible to reduce total distortion.

Q: What is the most commonly welded type of stainless steel welded tube?

A: Austenitic stainless steels typically have a composition within the range 16-26% chromium (Cr) and 8-22% nickel (Ni). A commonly used alloy for welded fabrications is Type 304 which contains approximately 18%Cr and 10%Ni. These alloys can be readily welded using any of the arc welding processes (TIG, MIG, MMA and SA).

Q: Can you bend stainless steel welded tube?

A: 304 Stainless can be very difficult to bend or form, especially larger diameters, because it is harder, less malleable, and tends to have thinner walls in relation to tubing diameter than other tubing materials.

Q: How do you join stainless steel welded tube without welding?

A: A cold weld compound, or metal epoxy putty, can be used to repair pipes, radiators and car parts such as exhaust pipes or crankcases. This type of metal adhesive is heat-resistant and can be used to bond stainless steel, aluminium, cast iron, PVC and zinc.

Q: How do you join stainless steel welded tubes?

A: Use a torch to heat up the joint until it's hot enough to melt the solder. Apply solder to the joint, then immediately use a wet rag to cool down the area around your pipe so you don't burn yourself with molten metal or warp its shape by applying too much heat too quickly!

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