stainless steel engineering pipe supplier

Popular science: How are stainless steel engineering pipes connected?

/in /by

As an important material widely used in the construction, engineering, and manufacturing industries, stainless steel pipe connection technology is one of the keys to ensuring project quality and service life. The editor of stainless steel pipe manufacturer, briefly introduces the connection methods of stainless steel pipes, including welding, threaded connection, pressure connection, etc., to help you choose the best connection method suitable for your project.

stainless steel engineering pipe supplier

1. Welding connection

Welding is the most commonly used method for connecting stainless steel pipes. It can achieve strong connections with high load-bearing capacity and corrosion resistance. The welded connections of stainless steel pipes can be divided into two types: manual welding and automated welding. Manual welding is suitable for small projects or special-shaped pipe connections, while automated welding is suitable for large projects and highly repetitive pipe connections.

When welding stainless steel pipes, you need to pay attention to the following points: First, choose the appropriate welding method. Common ones include TIG welding, MIG welding, electric welding, etc. Secondly, ensure the cleanliness of the welding surface to avoid the presence of dust, dirt, and other impurities. Finally, appropriate preheating and adjustment of welding parameters should be carried out before welding to ensure welding quality and connection strength.

2. Threaded connection

A threaded connection is a simple and reliable way to connect stainless steel pipes. It is suitable for engineering projects with smaller pipe diameters and lower pressures. Stainless steel pipe thread connections are divided into two types: internal threads and external threads. Common thread connection standards include the internationally accepted Willai thread, the commonly used domestic tapered pipe thread, etc.

When making threaded connections for stainless steel pipes, you need to pay attention to the following points: First, the sealing of threaded connections is poor, so sealants or gaskets need to be used to seal them to prevent water leakage. Secondly, the threaded connection must be installed with moderate attention, neither too loose to cause leakage nor too tight to cause deformation. Finally, be careful when disassembling to avoid damaging or straining the threads.

3. Pressure connection

Pressure connection is a method of connecting stainless steel pipes through pre-pressurization. It is suitable for projects with larger pipe diameters and higher pressures. There are two main types of pressure connections for stainless steel pipes: socket connections and flange connections. The socket connection is to inserts the pipe into the connection port and seals it under pressure, while the flange connection is to connects the pipes through flanges and bolts.

When making pressure connections of stainless steel pipes, you need to pay attention to the following points: First, choose appropriate sealing materials. Common ones include rubber gaskets, PTFE gaskets, etc. Secondly, the installation requirements must be strictly followed to ensure the sealing and safety of the connection. Finally, testing should be performed before connection to ensure the reliability and voltage resistance of the connection.

To sum up, stainless steel pipe connection technology is an important link in ensuring project quality and service life. Whether it is a welded connection, a threaded connection, or a pressure connection, it needs to be operated by the correct methods and requirements. Choosing the appropriate connection method can not only ensure the stability and durability of the project but also improve work efficiency and safety. I hope this article is helpful to your engineering projects!

stainless steel metal hose

/in /by

What is a stainless steel metal hose?

Stainless steel pressure-resistant metal hoses are made of 304 stainless steel or 301 stainless steel. They are used as protective tubes for automation instrument signals and wire and cable protection tubes for instruments. The specifications range from 3mm to 150mm. Ultra-small diameter stainless steel hose (4mm-12mm) provides solutions for the protection of precision electronic equipment and sensor circuits. It is used for sensing circuit protection of precision optical rulers and industrial sensor circuit protection. It has good softness, corrosion resistance, high-temperature resistance, wear resistance, and tensile strength.

The structure of stainless steel pressure-resistant metal hose: it is made of stainless steel bellows braided with one or more layers of steel wire or steel belt mesh sleeves, with joints or flange heads at both ends, and is used to transport flexible components of various media. The characteristics of stainless steel pressure-resistant metal hose: are corrosion resistance, high temperature resistance, low temperature resistance (-196℃~+420℃), light weight, small size, and good flexibility. Widely used in aviation, aerospace, petroleum, chemical industry, metallurgy, electric power, papermaking, wood, textile, construction, medicine, food, tobacco, transportation, and other industries.

stainless steel metal hose
Precautions for installation and use of stainless steel pressure-resistant metal hoses:

1. The bellows of the stainless steel hose is made of chromium-nickel austenitic stainless steel. When using it, pay attention to prevent pitting corrosion of nitrogen ions and corrosive damage of dilute sulfuric acid and dilute sulfuric acid.

2. After users conduct hydraulic pressure tests on equipment and piping systems equipped with stainless steel hoses, they should prevent the impact of rust blocks and the deposition of chloride-containing sediment, which may cause corrosion and mechanical damage.

3. During installation, the metal hose must prevent burns from splashes and mechanical damage during welding, otherwise it will cause leakage.

4. Sealing piping systems should strictly abide by safe operating procedures to prevent hoses from pulling off or bursting due to overpressure caused by improper operation or other factors.

5. Please carefully digest the examples of stainless steel hose installation methods, and install and use them strictly by the correct outline.

application areas of copper-nickel alloy pipes

What are the application fields of copper-nickel alloy pipes?

/in /by

As an excellent engineering material, copper-nickel alloy pipes are widely used in many fields. The following are the main application areas of copper-nickel alloy pipes:

Chemical industry: Copper-nickel alloy pipes have excellent corrosion resistance and can be used to manufacture various chemical equipment, pipes, valves, etc., such as chemical reactors, distillation towers, pipe joints, etc. This equipment, can effectively prevent acidic media from corroding equipment and ensure the stability and safety of chemical production.

Energy Engineering: it can be used to manufacture important components in energy engineering fields such as nuclear power plant equipment and petrochemical equipment. In this equipment, copper-nickel alloy pipes can provide reliable fluid transmission and heat exchange functions, while being able to withstand high working pressure and high temperatures, ensuring the safety and efficiency of energy production.

Ship engineering: they are also widely used in the field of ship engineering. For example, in ship condensers, evaporators, coolers, and other equipment, copper-nickel alloy pipes can provide efficient heat exchange and fluid transmission functions to ensure the normal operation of ships and energy conservation and emission reduction.

Aerospace: it can also be used to manufacture parts in the aerospace field, such as cooling systems and fuel systems for aircraft engines. In these systems, it can provide reliable fluid transmission and heat exchange functions, while being able to withstand harsh environmental conditions at high altitudes, ensuring the safety and performance of aircraft.

Construction field: it can also be used in the construction field, such as water supply and drainage pipes, heating pipes, etc. in buildings. In these applications, it can provide excellent fluid transmission and heat exchange functions, while being able to cooperate with other parts of the building to improve the overall performance and aesthetics of the building.

Electronic field: Copper-nickel alloy pipes can also be used to manufacture various electronic components, such as electronic connectors, circuit boards, etc. Among these components, copper-nickel alloy pipes can provide excellent electrical and thermal conductivity to ensure the performance and stability of electronic components.

As a metal material with wide application value, copper-nickel alloy pipe has broad application prospects in various fields. With the continuous advancement of science and technology and the growing demand for applications, the application fields of copper-nickel alloy pipes will continue to expand.

GR5 titanium alloy supplier

Application scope and performance of GR5 titanium alloy

/in /by

Application scope and performance of GR5 titanium alloy

GR5 titanium alloy is also known as TC4 titanium alloy. We also call it 6Al4V. This is the most widely used titanium metal. It is usually referred to as the GR5 titanium alloy we use. It has good reach and extension.

Titanium and its alloys have many excellent properties such as lightweight, high strength, strong heat resistance, and corrosion resistance. They are known as the “metal of the future” and are new structural materials with promising development prospects. Titanium and its alloys not only have very important applications in the aviation and aerospace industries, but have also been widely used in many industrial sectors such as the chemical industry, petroleum, light industry, metallurgy, and power generation. Titanium can resist corrosion of the human body and does not harm the human body. Therefore it can be widely used in the medical and pharmaceutical industry sectors. Titanium has good suction properties and is widely used in electronic vacuum technology and high vacuum technology.

GR5 titanium alloy supplier

Top ten properties of GR5 titanium alloy

1. Low density and high specific strength

The density of titanium metal is 4.51g/cubic centimeter, which is higher than aluminum and lower than steel, copper, and nickel, but its specific strength ranks first among metals.

2. Corrosion resistance

Titanium is a very active metal with a very low equilibrium potential and a high tendency of thermodynamic corrosion in the medium. But in fact, titanium is very stable in many media. For example, titanium is corrosion-resistant in oxidizing, neutral and weakly reducing media. This is because titanium has a great affinity with oxygen. In air or oxygen-containing media, a dense, highly adhesive, and inert oxide film is formed on the titanium surface, which protects the titanium matrix from corrosion. Even due to mechanical wear and tear, it will quickly heal itself or regenerate. This shows that titanium is a metal with a strong tendency to passivate. The titanium oxide film always maintains this characteristic when the medium temperature is below 315°C.

To improve the corrosion resistance of titanium, surface treatment technologies such as oxidation, electroplating, plasma spraying, ion nitridation, ion implantation, and laser processing have been developed to enhance the protection of the titanium oxide film and obtain the desired corrosion resistance. Effect. In response to the need for metal materials in the production of sulfuric acid, hydrochloric acid, methylamine solution, high-temperature wet chlorine, and high-temperature chloride, a series of corrosion-resistant titanium alloys such as titanium-molybdenum, titanium-palladium, titanium-molybdenum-nickel, etc. have been developed. Titanium-32 molybdenum alloy is used for titanium castings, titanium-0.3 molybdenum-0.8 nickel alloy is used for environments where crevice corrosion or pitting corrosion often occurs, or titanium-0.2 palladium alloy is used for parts of titanium equipment, both of which have been well used. Effect.

3. Good heat resistance

The new titanium alloy can be used for a long time at temperatures of 600°C or higher.

4. Good low-temperature resistance

The strength of low-temperature titanium alloys represented by titanium alloys TA7 (Ti-5Al-2.5Sn), TC4 (Ti-6Al-4V), and Ti-2.5Zr-1.5Mo increases as the temperature decreases, but the plasticity does not change. big. It maintains good ductility and toughness at low temperatures of -196-253°C, avoiding the cold brittleness of metal. It is an ideal material for low-temperature containers, storage boxes, and other equipment.

5. Strong anti-dumping performance

After titanium metal is subjected to mechanical vibration and electrical vibration, its own vibration attenuation time is the longest compared with steel and copper metals. This property of titanium can be used as tuning forks, vibration components of medical ultrasonic pulverizers, and vibration films of high-end audio speakers.

6. Non-magnetic and non-toxic

Titanium is a non-magnetic metal and will not be magnetized in a large magnetic field. It is non-toxic and has good compatibility with human tissue and blood, so it is used by the medical community.

7. Tensile strength is close to its yield strength

This property of titanium shows that its yield-strength ratio (tensile strength/yield strength) is high, indicating that titanium metal materials have poor plastic deformation during forming. Due to the large ratio of titanium’s yield limit to elastic modulus, titanium has a large resilience during molding.

8. Good heat exchange performance

Although the thermal conductivity of titanium metal is lower than that of carbon steel and copper, due to titanium’s excellent corrosion resistance, the wall thickness can be greatly reduced, and the heat exchange method between the surface and steam is dropwise condensation, which reduces the heat group and is too superficial. No scaling can also reduce thermal resistance, significantly improving the heat transfer performance of titanium.

9. Low elastic modulus

The elastic modulus of titanium is 106.4GPa at room temperature, which is 57% of steel.

10. Suction performance

Titanium is a metal with very active chemical properties and can react with many elements and compounds at high temperatures. GR5 titanium alloy breathing mainly refers to the reaction with carbon, hydrogen, nitrogen, and oxygen at high temperatures.

titanium screw supplier

Why are there hardness requirements for titanium screws?

/in /by

The density of titanium alloys is generally around 4.51g/cubic centimeter, which is only 60% of steel. Some high-strength titanium alloys exceed the strength of many alloy structural steels. Therefore, the specific strength (strength/density) of titanium alloys is much greater than that of other metal structural materials. It can produce parts with high unit strength, good rigidity, and lightweight. Titanium alloys are used in aircraft engine components, frames, skins, fasteners, and landing gear. So when we customize titanium screws, how should we choose the material of the screws? Titanium alloys are produced to meet the different needs of industry.

titanium screw supplier

Since all screws in the world are used in different environments and are used in different positions on machine components, the hardness, flexibility, thermal conductivity, and wear resistance of the titanium screws required by the machine are also different. Therefore, when customizing screw fasteners for customers, they will always ask the user where the screws are used and what kind of performance they need to have?

If hardness is required, it is recommended to use titanium-cobalt alloy. Titanium-cobalt alloy is generally used to make cutting tools. When selecting materials for titanium screw processing, you must understand that when the hardness of the screw is very high, the titanium screw will easily break.
​

INCONEL 718 stock

Cutting process of Inconel 718 material

/in /by

Inconel 718 material is a precipitation-hardened nickel-chromium alloy with high creep rupture strength at elevated temperatures up to approximately 700°C (1290°F). It has higher strength than Inconel X-750 and better low-temperature mechanical properties than Inconel 90 and Inconel X-750.

INCONEL 718 stock

Its main features: good creep rupture strength at high temperatures.

Inconel 718 has good resistance to organic acids, bases and salts as well as seawater. It has good tolerance to sulfuric acid, hydrochloric acid, hydrofluoric acid, phosphoric acid and nitric acid. Good oxidation resistance, carburizing, nitriding and molten salt capabilities. Good resistance to vulcanization.

Age-hardened Inconel 718 combines high-temperature strength, corrosion resistance and excellent machinability up to 700 °C. Its welding properties, especially its resistance to post-weld cracking, are excellent. Due to these properties, Inconel 718 material is used in parts of aircraft turbine engines; high-speed airframe components such as wheels, buckets, washers, etc.; high-temperature bolts and fasteners, cryogenic storage tanks, and in oil and gas exploration and nuclear engineering. part.

As we all know, ordinary cutting tools cannot cut Inconel 718 material. By far the most suitable cutting method for Inconel 718 is the new circular diamond wire cutting technology. Different from the traditional wire cutting method, loop wire cutting is very suitable for cutting this hard and brittle material. It has many advantages such as fast cutting speed, high efficiency, less consumables, simple and convenient operation, etc.

Stainless steel cutlery

Do you know some tips for descaling stainless steel tableware?

/in /by

What are the tips for descaling stainless steel tableware?

There are many stainless steel products among our daily household products, which are lightweight, practical, beautiful, and easy to clean. However, after using stainless steel for a while, there will be many stains attached to it that are difficult to remove for a while. There are many ways to clean stainless steel scales. Here are some common and effective tips:

Stainless steel cutlery

1. If there is scale on stainless steel kitchenware, we can buy a lemon in the market, then mash the lemon and put it into the kitchenware, add water, and then boil the water. After soaking for a while, citric acid can remove the scale very quickly. Good to clear out.

2. Egg shells can also remove stainless steel scales. Put egg shells in the kitchen utensils, then boil them for a while, so that the hard scale that is difficult to remove will automatically fall off, and then wash the stainless steel kitchen utensils.

3. White vinegar can also remove stainless steel scales. Pour white vinegar and water into the stainless steel kitchenware in a ratio of 1:2, then boil the water and soak it for more than two hours, then drain the water and rinse it with clean water. That’s it.

4. If scale or water stains are found on stainless steel utensils that cannot be wiped off, we can use a rag and dip vinegar to cover the scale for about half an hour, and then wipe it with clean water, so that it can be removed. Wipe off scale or water stains.

5. Use professional stainless steel cleaners.

stainless steel plates

4 things to note when processing stainless steel plates

/in /by

What are the precautions for stainless steel plate processing?

stainless steel plates

Choose suitable processing methods and tools
1. Suitable processing methods should be used when processing stainless steel plates, such as cutting, forming, welding, etc. Different processing methods require the use of different tools and equipment, which should be selected according to specific circumstances.

2. Use special stainless steel knives and do not mix them to avoid iron powder contamination or accelerated tool wear.

3. Select the appropriate coolant to ensure the service life and processing effect of the tool.

Ensure the surface of the board is clean before processing
1. Before processing, the oil and dust on the surface of the plate should be cleaned to ensure the processing quality.

2. Drill small holes before cutting or drilling to prevent tool vibration from damaging the surface finish.

3. Do not touch the board directly with your hands during processing to avoid leaving fingerprints and stains.

Control processing temperature
1. The processing temperature of stainless steel plates should be controlled below 400°C. Excessive temperature may cause plate deformation, oxidation, annealing, and other problems.

2. The cutting speed of stainless steel plates should be moderate to avoid processing difficulties if it is too slow, and affecting the quality of the cut if it is too fast.

Ensure the surface quality after processing
1. Clean the oil stains and oxide scale on the surface of the plate promptly after processing to ensure surface finish and anti-corrosion.

2. For plates that require surface treatment, such as polishing, passivation, etc., they should be carried out before processing to avoid affecting the processing quality.

3. When processing stainless steel plates, attention should be paid to the surface quality after processing, and scratches or dents should be processed in time to ensure the appearance quality.

316 materials

Under what circumstances must 316 materials be used?

/in /by

As we all know, 304 stainless steel is one of the most widely used stainless steel materials on the market. Some people may ask: Under what circumstances must we choose to use 316 stainless steel instead of 304 stainless steel? Stainless steel pipe manufacturers summarize the following four situations:

316 materials

Under what circumstances must 316 materials be used?

1. Coastal areas and shipbuilding industry: Because in coastal areas with relatively humid and high salinity environments, 304 stainless steel is more prone to corrosion. Since 316 stainless steel contains more than 2% molybdenum, its corrosion resistance and oxidation resistance in marine environments are significantly better than 304 stainless steel.

2. Medical industry: Because 304 stainless steel can reach food grade, while 316 stainless steel can reach medical grade and is used in medical instruments such as scalpels, oxygen tubes, etc., it is a safer stainless steel material.
3. Chemical industry: 316 stainless steel has strong corrosion resistance, wear resistance, and good processing performance. These advantages can meet the strict quality requirements of chemical equipment in various environments, making it widely used in the production of chemical machinery and equipment. In production.

4. Industries that require operations at high temperatures: 316 stainless steel can withstand high temperatures ranging from 1200 degrees to 1300 degrees, and can be used to produce jet engine parts, furnace parts, heat exchangers, tube evaporators, etc.

In general, 316 stainless steel material is used in various harsh conditions to replace 304 stainless steel pipes due to its relatively good corrosion resistance. If you want to know more about stainless steel knowledge, please feel free to call us!

stainless steel

Austenitic stainless steel should also pay attention to: cold work hardening, high temperature aging embrittlement

/in /by

Everyone is familiar with the intergranular corrosion and stress corrosion cracking problems of austenitic stainless steel.

The intergranular corrosion tendency test of stainless steel is common content in design documents, and the relevant content in standards such as HG/T 20581 is also relatively clear. The hydrostatic test or the chloride ion content in the operating medium is also a basic concern when designing austenitic stainless steel equipment. In addition to chloride ions, wet hydrogen sulfide, polythionic acid, and other environments that may produce sulfides can also cause stress corrosion cracking of austenitic stainless steel.

It is worth mentioning that although austenitic stainless steel is not mentioned in the chapter on wet hydrogen sulfide corrosion in HG/T 20581, the reference literature points out that austenitic stainless steel has a much greater ability to dissolve atomic hydrogen than ferritic steel. , but hydrogen-induced wet hydrogen sulfide stress corrosion cracking will still occur, especially after the deformation martensitic structure transformation occurs during cold work hardening.

stainless steel

Cold work hardening increases stress corrosion cracking susceptibility

Austenitic stainless steel has excellent cold working properties, but its work hardening is very obvious. The greater the degree of cold working deformation, the higher the hardness rises. Increased hardness due to work hardening is also an important cause of stress corrosion cracking in stainless steels, especially those in the base metal rather than the weld.

There are some cases below:

The first type of case is after austenitic stainless steel is cold-spinning to process an elliptical or disc-shaped head, the cold deformation in the transition zone is the largest, and the hardness also reaches the highest. After it was put into use, chloride ion stress corrosion cracking occurred in the transition zone, causing equipment leakage.

The second type of case is a U-shaped corrugated expansion joint made by hydroforming after rolling stainless steel plates. The cold deformation is the largest at the wave crest, and the hardness is also the highest. The most stress corrosion cracking occurs along the wave crest, and cracks occur along a circle of wave crests. Explosion accident involving low-stress brittle fracture.

The third type of case is stress corrosion cracking of corrugated heat exchange tubes. Corrugated heat exchange tubes are cold extruded from stainless steel seamless tubes. The crests and troughs are subject to varying degrees of cold deformation and thinning. The crests and troughs may cause several stress corrosion cracks.

The essence of cold work hardening of austenitic stainless steel is the generation of deformation martensite. The greater the cold working deformation, the more deformation martensite is produced and the higher the hardness. At the same time, the internal stress inside the material is also greater. if solid solution heat treatment is performed after processing and forming, the hardness can be reduced and the residual stress can be greatly reduced. At the same time, the martensite structure can also be eliminated, thereby avoiding stress corrosion cracking.

Embrittlement problems caused by long-term service at high temperatures

Currently, Cr-Mo steel with higher high-temperature strength is the main material for containers and pipes at temperatures between 400 and 500°C, while various austenitic stainless steels are mainly used at temperatures between 500 and 600°C or even 700°C. In design, people tend to pay more attention to the high-temperature strength of austenitic stainless steel and require that its carbon content not be too low. The allowable stress at high temperatures is obtained by extrapolating the high-temperature endurance strength test, which can ensure that no creep rupture will occur during 100,000 hours of service under the design stress.

However, the problem of age embrittlement of austenitic stainless steel at high temperatures cannot be ignored. After long-term service at high temperatures, austenitic stainless steel will undergo a series of structural changes, which will seriously affect a series of mechanical properties of the steel, especially the brittleness It increased significantly and the toughness decreased significantly.

The embrittlement problem after long-term service at high temperatures is generally caused by two factors, one is the formation of carbides, and the other is the formation of σ phase. The carbide phase and σ phase continue to precipitate along the crystal after the material has been in service for a long time and even form continuous brittle phases on the grain boundaries, which can easily cause intergranular fracture.

The formation temperature range of the σ phase (Cr-Fe intermetallic compound) is approximately 600 to 980°C, but the specific temperature range is related to the alloy composition. The result of the precipitation of σ phase is that the strength of austenitic steel increases significantly (the strength may be doubled), and it also becomes hard and brittle. High chromium is the main reason for the formation of the high-temperature σ phase. Mo, V, Ti, Nb, etc. are alloy elements that strongly promote the formation of σ phase.

The formation temperature of carbide (Cr23C6) is in the sensitization temperature range of austenitic stainless steel, which is 400~850 ℃. Cr23C6 will dissolve above the upper limit of the sensitization temperature, but the dissolved Cr will promote the further formation of the σ phase.

Therefore, when austenitic steel is used as heat-resistant steel, the understanding and prevention of high-temperature aging embrittlement should be strengthened. Just like the metal monitoring in thermal power plants, the metallographic structure and hardness changes can be regularly inspected. If necessary, samples can be taken out for metallographic and hardness inspections, and even comprehensive mechanical properties and durable strength tests can be conducted.