July 21, 2021 in Travels
When we are decorating, we can see all kinds of building materials, among which there may be austenitic stainless steel seamless pipe. So what is the performance of Austenitic Stainless Steel Seamless Pipe ?
Austenitic stainless steel seamless pipe is resistant to corrosion by oxidizing acid media. If it contains elements such as Mo and Cu, it can also be resistant to corrosion by sulfuric acid, phosphoric acid, formic acid, acetic acid, urea, etc. If the carbon content in this type of steel is less than 0.03% or contains Ti and Ni, its resistance to intergranular corrosion can be significantly improved. High-silicon austenitic stainless steel has good corrosion resistance to concentrated nitric acid. As austenitic stainless steel has comprehensive and good comprehensive properties, it has been widely used in all walks of life.
In layman’s terms, stainless steel is steel that is not easy to rust. Some stainless steels have both rust resistance and acid resistance (corrosion resistance). The rust resistance and corrosion resistance of stainless steel are due to the formation of a chromium-rich oxide film (passivation film) on its surface. This kind of rust resistance and corrosion resistance is relative.
Therefore, the performance of austenitic stainless steel seamless pipe is still very good, of course, the performance of Super Austenitic Stainless Steel Seamless Pipe and Tube is also very good.
July 6, 2021 in Travels
Alloy Steel Seamless Pipe is also a kind of seamless steel pipe, but in terms of performance, it is slightly better than other seamless steel pipes.
Alloy Steel Seamless Pipe is a seamless steel pipe made of alloy steel. Products are generally used for geological drilling with inner and outer thickened drill pipes at both ends, boiler high pressure, and non-attractive acid-resistant steel seamless steel pipes, etc. There are many varieties, generally classified by use, technical conditions, and acceptance rules are inconsistent, and they need to be used according to special purposes. Reasonable selection. In addition to the round section, there are rectangles (squares) and special shapes (flat oval, etc.).
Alloy Steel Seamless Pipe is also an indispensable material for various conventional weapons. The barrels and barrels are all made of steel pipes. In addition, when the ring section is subjected to internal or external radial pressure, the force is relatively uniform. Therefore, most Alloy Steel Seamless Pipes are round pipes.
The purpose of Nickel Alloy Seamless Pipe and Tube will be slightly different from that of Alloy Steel Seamless Pipe.
June 22, 2021 in Travels
We can see all kinds of seamless pipes in many places, but many people don’t know much about seamless pipes. So what is a seamless pipe and what is its use?
Seamless steel pipes have a hollow section and are used in large quantities as pipelines for conveying fluids, such as pipelines for conveying oil, natural gas, gas, water, and certain solid materials. Compared with solid steel such as round steel, steel pipe has a lighter weight when the bending and torsion strength is the same, and it is a kind of economical cross-section steel.
Widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipes, automobile transmission shafts, bicycle frames, and steel scaffolding used in construction. Steel pipes are used to make ring parts, which can improve material utilization, simplify manufacturing procedures, and save materials and processing. Working hours, steel pipes have been widely used for manufacturing.
Compared with the previous seamless pipes, the seamless pipes we use now have great improvements in terms of material and technology, which are inseparable from the efforts of seamless pipe manufacturers. Good Seamless Pipe Manufacturers can help you solve a lot of troubles. Huzhou Nanxun Changyin Special Material Technology Co., Ltd. is like this.
June 1, 2021 in Travels
Alloy Steel Seamless Pipe is a kind of seamless steel pipe, and its performance is much higher than that of ordinary seamless steel pipe. Alloy Steel Seamless Pipe contains elements such as silicon, manganese, chromium, nickel, molybdenum, tungsten, vanadium, titanium, niobium, zirconium, cobalt, aluminum, copper, boron, and rare piles of earth.
Alloy Steel Seamless Pipe is a kind of seamless steel pipe. Its performance is much higher than that of ordinary seamless steel pipe. Because this steel pipe contains more Cr, its high-temperature resistance, low-temperature resistance, and corrosion resistance are the same as other seamless steel pipes. Not comparable, so alloy pipes are widely used in petroleum, chemical, electric power, boilers, and other industries.
Alloy Steel Seamless Pipe contains elements such as silicon, manganese, chromium, nickel, molybdenum, tungsten, vanadium, titanium, niobium, zirconium, cobalt, aluminum, copper, boron, and rare piles of earth.
Compared with solid steel such as round steel, Alloy Steel Seamless Pipe has a lighter weight when the bending and torsion strength is the same. Bicycle racks and steel scaffolding used in building construction, etc.
The performance of Nickel Alloy Seamless Pipe and Tube is also very good.
May 25, 2021 in Travels
There are many seamless pipes around us, one of which is the stainless steel seamless pipe. Today we will talk about some simple related understanding of Stainless Steel Seamless Pipe .
Stainless steel seamless pipe is a long strip of steel with a hollow section and no joints on the periphery. The thicker the wall thickness of the product, the more economical and practical it is, and the thinner the wall thickness, its processing cost will rise substantially.
The process of this product determines its limited performance. Generally, seamless steel pipes have low precision: uneven wall thickness, low brightness on the inside and outside of the pipe, high cost of sizing, and there are pitting and black spots on the inside and outside that are not easy to remove; its detection and Shaping must be processed offline. Therefore, it embodies its superiority in terms of high-pressure, high-strength, and mechanical structural materials.
Because Stainless Steel Seamless Pipe has good comprehensive performance, it is widely used in basic projects such as chemical industry, construction, water supply, drainage, petroleum, light and heavy industry, refrigeration, sanitation, plumbing, fire fighting, electric power, aerospace, shipbuilding and so on.
April 29, 2021 in Travels
The appearance of nickel alloy played an important role in the production and development of nickel alloy seamless pipe and tube.
Nickel alloys were developed in the late 1930s. The nickel-based alloy Nimonic75 (Ni-20Cr-0.4Ti) was first produced in the United Kingdom in 1941. In order to increase the creep strength and add Al, Nimonic 80 (Ni-20Cr-2.5Ti-1.3Al) was developed.
The United States in the mid-1940s, Russia in the late 1940s, and China in the mid-1950s also developed nickel-based alloys. The development of nickel-based alloys includes two aspects, namely the improvement of alloy composition and the innovation of production technology.
In the early 1950s, the development of vacuum smelting technology created conditions for refining nickel-based alloys with high Al and Ti content and drove a substantial increase in alloy strength and service temperature. In the late 1950s, due to the increase in the working temperature of turbine blades, alloys were required to have higher high-temperature strength, but when the strength of the alloy was high, it was difficult to deform, or even unable to deform. Therefore, precision casting technology was used to develop a series of good high-temperature strengths. Of casting alloys. In the mid-1960s, directional crystalline and single crystal superalloys with better performance were developed, as well as powder metallurgy superalloys.
In order to meet the needs of ships and industrial gas turbines, a number of high-Cr nickel-based alloys with good thermal corrosion resistance and stable structure have been developed since the 1960s. In about 40 years from the early 1940s to the late 1970s, the working temperature of nickel-based alloys increased from 700 by 1,100°C, an average annual increase of about 10°C.
Today, the service temperature of nickel-based alloys can exceed 1,100°C. From the aforementioned Nimonic75 alloy with a simple composition to the recently developed MA6000 alloy, the tensile strength at 1,100°C can reach 2,220MPa and the yield strength is 192MPa; Its durability under the conditions of 1,100℃/137MPa is about 1,000 hours, and it can be used for aero-engine blades.
For more information about Alloy Steel Seamless Pipe, you can consult Huzhou Nanxun Yintuo Special Material Technology Co., Ltd.
April 22, 2021 in Uncategorized
1. Strictly control the carbon content
Carbon is the main element that causes intergranular corrosion. When the carbon content is below 0.08%, the amount of carbon that can be precipitated is small. Above 0.08%, the amount of precipitated carbon increases rapidly, so the carbon content of the base metal and welding rod is often controlled below 0.08%. In addition, when the carbon content of the austenitic steel is less than 0.02%-0.03%, all the carbon is dissolved in the austenite and no intergranular corrosion occurs.
2. Add stabilizer
The addition of titanium, niobium and other elements that have a stronger affinity with carbon than chromium in the welding material can improve the resistance to intergranular corrosion.
3. Carry out solution treatment
After welding, heat the joint to 1050-1150°C, hold for 1 hour and then water quench. At this time, the grain boundary chromium carbide is completely dissolved, so that the carbon is re-dissolved into the austenite, and then rapidly cooled, so that the carbon is too late to precipitate and form a stable uniform The austenite structure eliminates the chromium-depleted layer at the grain boundary and avoids intergranular corrosion.
4. Perform homogenization treatment
The austenitic stainless steel is heated to 850-900℃ for 2h, so that the chromium inside the grains will also diffuse to the grain boundaries, so that the mass fraction of grain boundary chromium is restored to more than 12%, thereby eliminating the grain boundary chromium-depleted layer.
5. Reduce welding heat input
In terms of the welding process, small current, high welding speed, short arc and straight welding are adopted. In multi-layer and multi-pass welding, the temperature between layers should not be too high, and the next layer should be welded after the first layer is completely cooled (<60℃), and the joints between layers should be staggered.
6. Speed up the cooling of the joint
Weldments should not be preheated before welding. After welding, the cooling of the joints should be accelerated as much as possible, such as using copper backing plates, or even water cooling and other compulsory measures when conditions permit, to reduce the residence time of the joints at dangerous temperatures and prevent intergranular corrosion.
7. Arrange the welding sequence reasonably
In multi-layer welding and double-sided welding, the heat effect of the next weld may have a sensitizing temperature heating effect on the overheated area of the first weld. Therefore, the side of the double-sided weld that is in contact with the corrosive medium should be welded last as far as possible.
If you want to know more about austenitic stainless steel seamless pipe, super austenitic stainless steel seamless pipe and tube, please consult us for more information.
April 15, 2021 in Uncategorized
Ferritic-austenitic duplex stainless steel pipe is stainless steel in which austenite and ferrite each account for about half of the structure.
In the case of low C content, the Cr content is 18% to 28%, and the Ni content is 3% to 10%. Some steels also contain alloying elements such as Mo, Cu, Si, Nb, Ti, and N.
This type of steel has the characteristics of austenitic and ferritic stainless steel. Compared with ferrite, it has higher plasticity and toughness, no room temperature brittleness, and significantly improved intergranular corrosion resistance and welding performance, while still maintaining iron The 475℃ brittleness, high thermal conductivity, and superplasticity of element stainless steel.
Compared with austenitic stainless steel, it has high strength and significantly improved resistance to intergranular corrosion and chloride stress corrosion. Duplex stainless steel has excellent pitting corrosion resistance and is also nickel-saving stainless steel.
The formation of the ferrite phase has the following effects on the properties of austenitic stainless steel. The appearance of the F phase generally has an adverse effect on the performance of austenitic stainless steels, such as increasing the tendency of hot working to produce cracks; the pitting resistance of steel decreases and the corrosion resistance deteriorates in many corrosive environments; When heating for a long time at high temperature, the F phase will be transformed into the σ phase to make the steel brittle and so on.
If you want to know more about stainless steel seamless pipe, you can consult Huzhou Nanxun Yintuo Special Material Technology Co., Ltd.
April 1, 2021 in Travels
Nickel alloys refer to a class of alloys with comprehensive properties such as high strength and certain oxidation and corrosion resistance at a high temperature of 650-1000°C.
According to the main performance, it is subdivided into nickel-based heat-resistant alloys, nickel-based corrosion-resistant alloys, nickel-based wear-resistant alloys, nickel-based precision alloys and nickel-based shape memory alloys. Superalloys are divided into iron-based superalloys, nickel-based superalloys and cobalt-based superalloys according to the different substrates.
Britain first produced the nickel-based alloy Nimonic 75 (Ni-20Cr-0.4Ti) in 1941; in order to increase the creep strength, aluminum was added, and Nimonic 80 (Ni-20Cr-2.5Ti-1.3Al) was developed. The United States in the mid-1940s, the Soviet Union in the late 1940s, and China in the mid-1950s also developed nickel-based alloys.
Nickel-based superalloys are the most widely used. The main reason is that one is that more alloying elements can be dissolved in nickel-based alloys and can maintain better structural stability. Second, it can form a coherent and ordered A3B type intermetallic compound γ[Ni3(Al, Ti)] phase as a strengthening phase, so that the alloy can be effectively strengthened, and a higher temperature than iron-based superalloys and cobalt-based superalloys can be obtained. strength. The third is that chromium-containing nickel-based alloys have better oxidation resistance and gas corrosion resistance than iron-based superalloys.
Huzhou Nanxun Yintuo Special Material Technology Co., Ltd. is committed to producing Alloy Steel Seamless Pipe. If you need to buy seamless pipe-related products, you can contact us at any time: https://www.yintuosteel.com/product/nickel-alloy/nickel-alloy-seamless-pipe-and-tube.html
March 25, 2021 in Travels
A cold drawing is to draw a metal pipe with a cold drawing machine without heating. The advantage is that it does not need to be carried out at high temperatures. The disadvantage is that the residual stress is large and the drawing cannot be too long. Cold drawing can improve the toughness and tensile strength to obtain better mechanical properties.
The process of cold drawn seamless steel pipe is mainly round tube billet → heating → perforation → heading → annealing → pickling → multi-pass cold drawing → semi-finished pipe → heat treatment → straightening → hydraulic test → marking → storage.
Cold drawing and cold drawing are two different methods of metal cold working, and the two are not the same concept. Cold drawing refers to the method of applying tensile force on both ends of a metal material to cause the material to stretch and deform.
Cold drawing refers to the method of applying a pulling force on one end of the material to pull the material through a mold hole. The diameter of the mold is smaller than the diameter of the material. The cold drawing process causes the material to have extrusion deformation in addition to the stretching deformation. The cold drawing process is generally carried out on a special cold drawing machine. The material processed by cold drawing has better performance than the material processed by cold drawing.
Huzhou Nanxun Yintuo Special Material Technology Co., Ltd. is committed to producing austenitic stainless steel seamless tube, super austenitic stainless steel seamless pipe and tube and other types of seamless tubes. If you need to purchase related tubes, please contact us.