Is there a seam and seamless difference between stainless steel heat exchanger tubes?

Stainless steel welded pipes have seams and seamless, the main difference is that there are point welds in the future, and there is a possibility of water leakage, so it is best to choose seamless.

The connection of stainless steel heat exchanger tube with seams is relatively poor, and if it is seamless, the connection is better and not easy to be damaged, and the use time is relatively long.

Seamless heat pipes are unibody molded without seams.

And the seam is that there are welding marks at the surface connection.

Stress resistance is not the same, and neither is it.

The pressure value of the seamed pipe is low pressure, generally less than 16 kg, and the seamless pipe belongs to the high-pressure pipe, and the service life of the seamed pipe is short.

Just the difference between the heat pipe with a seam and seamless, the stainless steel heat exchange tube, the wind is the wind, they are different in appearance on the two upways, and the function is also different.

Hello friends, stainless steel heat pipes have a seam and a seamless difference, if there is a seam, it must be better to dissipate heat, and seamless is also better.

The difference between stainless steel heat exchanger tube seam and seamless is big, if there is wind, it should be stainless steel. Hot air pipes are very harmful.

The difference between seamed and seamless stainless steel heat exchanger tubes is that seamed steel pipes may have hidden dangers of leakage.

The main difference between stainless steel heat exchanger tubes with seams and seamless is that they have different pressure resistance.

The main differences between seamless steel pipes and seamed steel pipes are as follows:

The production process is different.

Seamless steel pipe is a seamless steel pipe produced by round steel through pipe blank, perforation, sizing and straightening, and there is no weld as a whole; Seamed steel pipes are also welded steel pipes, which can be divided into spiral welded pipes and longitudinal welded pipes from the production process. Spiral steel pipe is a spiral seam steel pipe made of strip coil as raw material, extruded at room temperature, and welded by automatic double-wire double-sided submerged arc welding process; The longitudinal welded pipe is made of hot-rolled or cold-rolled steel plate or steel strip coil welding, and the steel pipe obtained by longitudinal seam welding on welding equipment.

Seamless steel pipe. 2.The pressure is different.

The general pressure of seamed steel pipes is about 10 kg, while the pressure of seamless steel pipes is higher, such as 20g high-pressure boiler tubes, the pressure can reach 300-450 kg.

Spiral welded pipe. 3.The limitations of the caliber are different.

At present, the diameter of seamless steel pipe can only reach 1020mm, which has great limitations; The seamed steel pipe can reach 4000mm, and the diameter that can be produced is larger.

4。**Different.

Seamless steel pipes** are significantly higher than seamed steel pipes.

Straight seam welded pipes. 5.The length is different.

Seamless steel pipes are generally loose feet (meters) and fixed feet (6 meters, 9 meters, 12 meters), and the delivery length can be agreed by customer.

Seamed steel pipes are generally 6 meters and 12 meters.

Aluminum ingot processing method.

Indirect extrusion (seamless tube) surface turning, no scale entrapment.

Direct extrusion (seamed tube) skin is not turned, and there may be an oxide layer in the product that is involved in the action of aluminum ingots and ingot barrels.

Seamless tube integrated flow, frictionless; The metal flows evenly;

There is relative friction in the seamed tube; uneven flow of metals; The product contains coarse grains.

Product appearance. The inner and outer walls of the seamless tube are smooth and clean; There are no burns or cracks on the surface;

The appearance and finish of the seamed tube are average.

Mechanical properties of the product.

Uniform metal flow from the beginning to the end of the seamless pipe product; High dimensional accuracy; Good fatigue resistance; Consistent mechanical properties; No lamellar tissue.

The metal flow at the beginning and end of the product with seam tube cannot be uniform; inconsistent mechanical properties; Laminar tissue is predisposed.

Product Category. Seamless pipes are especially suitable for extruding various super-hardness alloy rods and tube profiles (such as other series);

Seamed pipes are suitable for extruding alloy products of general hardness, and the added value of general economy is generally economical.

Seamless tubes** are relatively high, making them suitable for manufacturing high-precision products.

Seamed tubes** are relatively inexpensive and suitable for the system of general products.

The differences are as follows: 1. The seamless steel pipe is formed at one time in rolling; Seamed steel pipes need to be welded after rolling, generally spiral welding and straight welding. The performance seamless pipe is better, and of course the price is higher.

2. The maximum pressure that the seamed pipe can withstand is less than 20 kg, which is the safest range of use; Seamless pipes can withstand ultra-high pressures, and of course their wall thickness increases, which needs to be designed according to the pressure requirements.

3. Generally, there is a certain difference in the chemical composition of seam pipe and seamless pipe. The steel composition used to produce seamless pipes is only a basic requirement to meet ASTM. Steels used to produce seamed pipes, on the other hand, contain chemistries that are suitable for welding.

For example, the mixing of silicon, sulfur, manganese, oxygen and triangular ferrite in a certain proportion can produce a weld melt that easily transfers heat during the welding process, so that the entire weld can be penetrated. Steel pipes lacking the above chemical compositions, such as seamless pipes, will produce various unstable factors during the welding process, and are not easy to weld quietly and impermeable.

4. Seamed pipes are generally used for low-pressure fluids such as water, gas, and compressed air; Seamless pipes are generally used for high-pressure oil pipes, boiler pipes and other high-temperature and high-pressure equipment. There are also seamless pipes for structures, which depends on the design requirements.

Other] Some seamed steel pipes are seamlessly treated pipes, which annealed the weld to eliminate the residual stress of the weld, so that the weld is equivalent to the base metal, and its bearing range is basically equivalent to that of the seamless pipe such as hail.

There are also some seamless steel pipes that are drawn or rolled with cores after the overall heating of seamed steel pipes, mainly small specifications, and this kind of pipe is only a seamless pipe in terms of shape, but the substance is not very good for lack of rubber slag.

1. The process is different.

The big difference between the production process of longitudinal seam steel pipe and seamless pipe is that the longitudinal seam is made of steel pipe welded by coil plate leveling and then through resistance welding, longitudinal seam steel pipe, or submerged arc welding. There is a longitudinal weld. Seamless steel pipes are made by hot rolling or cold drawing of round steel.

As the name suggests, seamless steel pipes do not have welds.

2. The practicality is different.

In terms of practicality, longitudinal seam steel pipes are mainly used for low-pressure fluid transportation, low-pressure gas transportation, and mine Shenchang drainage, etc. The material is mainly Q235A, Q235B and other ordinary carbon steel. The pressure of the seamless steel pipe is greater than that of the longitudinal steel pipe, so it is generally used for high-pressure fluid transportation, such as gas cylinder pipes, diesel engine oil pressure pipes, and some of the wide and long pipes are used in the steel structure, and its main materials are 20 steel, 45 steel and 16mn and so on.

3. Different ways of formation.

A straight seam pipe is a welded pipe with a straight weld seam. It is a tube that is welded after the steel strip is rolled up. A seamless pipe is a steel pipe with no seams. It is a round steel that is directly cold drawn or hot-rolled by extrusion or perforation.

Encyclopedia - straight seam tube.

Encyclopedia — seamless pipes.

Hello dear, sanitary grade stainless steel pipes are seamless. Sanitary stainless steel pipe seam or seamless, is both, but the manufacturing process is different, but now many manufacturers are using seams, welded pipe is a deep processing product of the plate, its wall thickness is uniform Hu Cong's advantage is incomparable, at the same time, it can also be arbitrarily fixed, high accuracy; The welding method is simple, the product specification range is wide, the surface is smooth, and the yield is high. The application of welded pipes makes the internal surface of sanitary stainless steel pipes smooth, low friction resistance, clean and hygienic, which reduces the waste of energy when transporting water, after all, it is of great significance to save energy.

In addition, stainless steel welded pipes can guarantee 100% **. Waste stainless steel welding can also be 100% **, will not cause pollution, which is in line with the current requirements of the scientific development concept of energy conservation and environmental protection advocated by the national barrier cover family.

1. The processing technology is different

Seamless pipes are made of high-quality carbon steel or alloy steel. The processing technology of seamless pipes is divided into two methods: cold drawing and hot rolling, while seamed pipes are generally welded.

2. Different uses:

Seamless pipes are mainly used as pipes or structural parts to transport fluids, mainly in the machinery industry, while seamed steel pipes are mainly used in the construction industry, such as low-pressure fluids such as water, gas, and compressed air. However, seamless steel pipes are used for pressure pipelines.

3. **Different:

Because the production process of seamless steel pipe is more complex, it is more expensive than seamed steel pipe, and seamed steel pipe is mainly made of steel plate (steel belt) secondary welding, which is cheap and widely used.

The development of steel pipe production technology began with the rise of bicycle manufacturing, the development of oil in the early 19th century, the manufacture of ships, boilers and airplanes during the two world wars, the manufacture of thermal power boilers after World War II, the development of the chemical industry, and the drilling and transportation of oil and gas, all of which have strongly promoted the development of the steel pipe industry in terms of variety, output and quality.

Steel pipes are not only used to transport fluids and powdery solids, exchange heat energy, and make mechanical parts and containers, it is also an economical steel. The use of steel pipes to manufacture building structure grids, pillars and mechanical supports can reduce weight, save metal by 20 40%, and can realize factory mechanized construction. The use of steel pipes to make highway bridges can not only save steel and simplify construction, but also greatly reduce the area of the protective layer and save investment and maintenance costs.

Basic Information. Classify.

Classified by production method.

Steel pipes can be divided into two categories according to the production method: seamless steel pipes and seamed steel pipes.

1.According to the production method, seamless steel pipes can be divided into: hot-rolled seamless pipes, cold-drawn pipes, precision steel pipes, hot-expanded pipes, cold-spinning pipes and extruded pipes.

Seamless steel pipes are made of high-quality carbon steel or alloy steel, and are hot-rolled and cold-rolled (drawn).

2.Welded steel pipes are divided into furnace welded pipes, electric welded (resistance welded) pipes and automatic arc welded pipes because of their different welding processes, and are divided into two kinds of longitudinal welded pipes and spiral welded pipes because of their different welding forms, and round welded pipes and special-shaped (square, flat, etc.) welded pipes because of their end shapes.

Welded steel pipe is made of coiled tubular steel plate welded by butt seam or spiral seam, and in terms of manufacturing method, it is divided into welded steel pipe for low-pressure fluid transportation, welded steel pipe with spiral seam, direct coil welded steel pipe, welded pipe, etc. Seamless steel pipes can be used in various industries such as liquid pneumatic pipes and gas pipelines. Welded pipes can be used for water pipelines, gas pipelines, heating pipelines, electrical pipes, etc.

1. Process differences: seamless steel pipes are made of high-quality carbon steel and alloy steel. The production methods of seamless steel pipes mainly include cold drawing method and hot rolling method, and welded steel pipes are usually welded.

2. Different uses: seamless pipe is a kind of fluid transportation pipeline or structural component mainly used in the machinery industry, while seamed steel pipe is used in low-pressure fluids such as water, gas, and compressed air. However, all pressure lines are made seamlessly.

3. Different: Due to its complex manufacturing process, it is higher than the seamed steel pipe, and the seamed steel pipe is made of steel plate (steel bar) secondary welding, with low solid cost and wide application range.

4. Differences in processing technology. The seamless pipes produced by our company are made of high-quality carbon steel or alloy materials. There are two main production methods for seamless steel pipes: cold drawn and hot rolled, while seamed steel pipes are usually welded.

5. Seamless steel pipe is a kind of pipe or pipe mainly used in the machinery industry. Seamed steel pipes are widely used in the construction industry, such as water, gas, air and other fluids with high pressure. Tongyou Yu often uses seamless steel pipes. Seamless tubes.

6. Under normal circumstances, the working pressure that the seamed steel pipe can withstand is less than 20kg, which is a good and complete sound. It is generally used for liquids with high pressure, such as water, gas, and compressed air. Seamless pipes can withstand extremely high pressures, but its wall thickness will also increase accordingly, which needs to be designed according to a certain pressure, and is usually used in high-pressure oil pipes, boiler pipes and other high-temperature and high-pressure equipment.

Depending on the design requirements, seamless steel pipes for construction are also available.

At present, the seamed steel pipe is annealed by the weld, and its bearing range is the same as that of the seamless steel pipe. Think about it. At present, there are several seamed steel pipes on the market that are heated as a whole, and then rolled by drawing out or with a core head, this kind of steel pipe is only a seamless steel pipe on the surface, and its properties are not very ideal.

7. Differences in use. Seamless steel pipes are processed by cold drawing and hot rolling, and are usually used when the medium pressure reaches above. The seamed steel pipe is formed by high-frequency butt welding after forming, and its working pressure is below.

There are four differences between seamless steel pipes and seamed steel pipes, as follows:

1. The appearance is different: the seamed steel pipe has welding bars on the inner wall of the welded pipe, while the seamless steel pipe does not.

2. Different pressures: the seamed steel pipe is about 10 MPa, while the seamless steel pipe has a higher pressure.

3. Different uses: seamed steel pipes are mainly used in the construction industry, while seamless pipes are mainly used in the machinery industry.

4. The process is different: the seamed steel pipe needs to be rolled and welded, while the seamless steel pipe is formed at one time in rolling.