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2.Seamless steel pipe: It is made by cold rolling, cold drawing or hot extrusion production process using round steel perforation as raw material. Working hours.  Usually the pipe wall is thick.Seamless steel pipe: The steel pipe has 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. ASTM A53 is produced mainly for pressure and mechanical applications, and is also used for transport of steam, water, gas line pipes.Welded pipe: its pressure-bearing performance is general, mainly used to transport water, oil, gas, air, and heating water or steam and other generally lower pressure fluids. The difference on the outer surfaceWelded pipe: The steel pipe has high precision, uniform wall thickness, high brightness inside and outside the pipe, and can be arbitrarily cut to length; it can be used as a thin-walled pipe. The stainless steel seamless pipe wholesale difference in priceThe production process of seamless steel pipe is more complicated, and its price is more expensive than welded pipe.
According to different welding methods, it can be divided into straight seam welded pipe and spiral welded pipe. The difference in production processWelded pipe: The steel plate or steel strip is used as raw material, and it is welded after being crimped by the unit and mold. Steel pipes are used to make ring parts, which can improve material utilization, simplify manufacturing procedures, and save materials and processing. 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.
The difference in performanceSeamless steel pipes are much higher than welded pipes in corrosion resistance and pressure and high temperature resistance.Seamless pipe vs welded pipe1.5. It is largely used to convey fluids at low / medium pressures such as oil, gas, steam, water, air and also for mechanical applications.Tips: ASTM A53 covers seamless and welded steel pipe with nominal wall thickness. In some aspects, welded pipes can replace seamless pipes.With the improvement of welded pipe manufacturing technology, the mechanical properties and mechanical properties are slowly approaching seamless pipes. ASTM A53 ERW steel pipe is a typical carbon steel pipe( CS ERW pipe). The difference in applicationSeamless steel pipe: It has a hollow section and is used as a pipeline for transporting fluids, such as pipelines for transporting oil, natural gas, gas, water and certain solid materials. The surface condition is usually black and hot-dipped galvanized.4.3

Spiral welded pipe is mainly used in oil, natural gas pipeline, its specifications expressed in diameter * wall thickness. Generally, also known as straight seam welded pipe and straight seam steel pipe [1]. In recent years, with production of stainless steel thin wall pipe application is very wide, senior furniture, decoration, fencing, etc.Spiral welded pipe, is to put the low carbon carbon structural steel and low alloy steel strip according to certain Angle of helix Angle (called molding) rolled into a tube billet, then pipe seam welding made up, it can use a narrow strip in the production of large diameter steel pipe. Zinc galvanization steel tube hot dip galvanized and electrical steel, hot dip galvanized zinc coating thickness, electric galvanizing cost is low.1.Galvanized steel pipe: in order to improve the corrosion resistance of steel pipe, galvanized steel pipe (clarinet) commonly.
Special pipe: by ordinary carbon structural steel and 16 mn steel guitar with welded square tube, rectangular pipe, caps, empty plastic steel doors and Windows with steel tube, mainly used for agricultural machinery parts, steel window, door, etc.According to the application is divided into general welded pipe, galvanized welded pipe, oxygen blowing metric welded pipe, welded pipe, wire casing, roller tube, deep well pump pipe, auto tube, transformer, electric welding thin wall pipe, welded pipe and spiral welded pipe. The weldingStraight seam pipe generally adopt high-frequency welding, high frequency welding is a kind of induction (or contact pressure welding) welding, it need to weld filler, no welding spatter, narrow welding heat affected zone, weld moulding beauty, weld the advantages of good mechanical performance, thus is widely used in steel production. Steel pipe for pressure, bending, flattening and so on experiment, the surface quality is a certain request, usually the delivery length for 4 to 10 m, often required scale (or foot) delivery of the goods. Steel tube to length or delivery times ruler, steel tube bending has certain requirements. But compared with the same length of straight seam pipe, weld length by 30 ~ 100%, and the production speed is low.
By the end shape classificationIs divided into circular welded pipe and alien (square, flat, etc) welded pipe. Welded steel pipe is made of billet is steel plate or strip.The strength of the spiral welded pipe, is generally higher than straight seam welded pipe, use a narrow billet production of larger diameter welded pipe, you can also use the same width of billet in the production of different pipe diameter welded pipe. According to the principle of electromagnetic induction and ac charge in the conductor skin effect and proximity effect and eddy current heating effect, make the edge of the weld steel locally heated to a molten state, the squeezing roller, to realize the joint between the crystal butt weld, so as to achieve the purpose of the welding seam, cooled to form a solid straight seam weld.5 219. Straight seam pipe is made by high frequency welding machine will be plastic strip rolled steel strip and USES the straight seam welded together. Metric can tube welding points, and thin wall, the common used as a structure, such as transmission shaft, or transmission fluid, thin wall used to make furniture, lamps and lanterns, etc. For corrosion protection, some aluminized processing. Proximity effect such as the gap is too small a result, the welding heat is too big, cause the burning of the weld; Or weld after extrusion, rolling the deep pit formation, affect the surface quality of the weld.
Of tube bending, end face to the center line of the vertical, ovality has certain requirements, general water pressure and the flattening test., to ensure that the steel pipe strength and bending test. If clearance is too large, resulting in a decrease of proximity effect, eddy current heat is insufficient, the joint between the weld crystal bad and incomplete fusion or crack generation. The welding temperatureLow carbon steel material, welding temperature control in 1250 ~ 1460 , the wall thickness 3 ~ 5 mm penetration can meet the requirements.Wire casing: are ordinary carbon steel welded steel pipe, used in concrete and various power distribution project, common nominal diameter from 13-76 - mm. Wire set set wall is thinner, mostly for coating or galvanized after use, requirements for cold bending test.
Straight seam pipe refers to weld steel tube and steel tube parallel to the longitudinal. With 8, 10, 15, 20, or Q195 - made of Q235 steel strip.2.Roller tube: used in belt conveyor roller welded steel pipe, Q215, Q235A, B is commonly used in steel and 20 steel manufacture, 63.3. When the heat input is insufficient, the heated weld edge short of welding temperature, metal organization remains solid, forming not fusion or lack of penetration; When the heat input is too large, weld edge over welding temperature of the heated, burnt or drop, make the weld formation of melt hole.General welded pipe: general welding work for low pressure liquid.Transformer tube: used in the manufacture of transformer radiator pipe and other heat exchanger, using common carbon steel manufacturing, requirement of flattening, flaring, bending, hydraulic test. Use Q195A, Q215A, Q235A steel manufacturing. In nominal diameter straight seam pipe specifications, according to the wall thickness can be divided into thin-walled straight seam pipe and thick wall tube two straight. Welding temperature is mainly by regulating the high frequency eddy current to control thermal power and welding speed. Of the specifications of the welded pipe in nominal diameter (mm or inches) nominal diameter is different from the actual, welded pipe wall thickness by the regulation with ordinary steel pipe and thickening steel pipe, steel pipe and the form of the pipe end points with thread and don't take two.Welded steel pipe refers to the steel belt or steel plate bending deformation shapes such as round, square before welding, jointed on the surface of steel pipe.
Welding thin wall pipe: mainly used for making furniture, toys, lamps, etc. Spiral welded pipe with one-side welding and double welding, tube welding shall ensure that the water pressure test, the tensile strength and cold bending properties of the weld in accordance with regulations.Metric welded pipe, the form of specifications with a seamless tube, expressed in mm outside diameter * wall thickness of welded steel pipe, can use ordinary carbon steel, quality carbon steel or low alloy steel in the tropics, cold welding, or with tropical again after the cold welding method is made. According to the shape can be divided into round, square or shaped tube, etc.According to the weld shape classificationCan be divided into straight seam welded pipe stainless steel welded pipe manufacturers and spiral welded pipeStraight seam welded pipe, simple production technology, high production efficiency, low cost, rapid development. Also can be used to other mild steel welding manufacturing. As a result, a small diameter welded pipe are mostly with straight seam welding, large diameter welded pipe for the most part adopts spiral welded.Oxygen tube welding: used for steelmaking oxygen tube, generally with small diameter welding pipe, specifications by 3/8 inch - 2 inch eight. The weld gapWill strip into welded pipe unit, the multichannel roll rolling, strip steel rolled up gradually, there is an open space form of round billet, adjust the quantity of the squeezing roller, make the weld gap control in 1 ~ 3 mm, and the joint match on both ends.0 mm in diameter

In order to avoid reduction of impact toughness (temper brittleness), and the corrosion caused by the precipitation of chromium carbides decreased. Martensitic stainless steel with high carbon content than martensitic stainless steel with low carbon content temper brittleness is more susceptible to cold formability, weldability worse. Martensitic stainless steel after tempering is often used to quench tempering 600 to 750 percent, while tempering asked for 1 ~ 4h, get tempered sorbite to improve and enhance the strength and toughness martensitic stainless steel, etc.com. After tempering to be a faster cooling rate, generally using oil cooling temperatures. Crl3 type martensitic stainless steel tempering temperature selection should be based on conditions of use, the requirements of high hardness, high wear resistance of parts usually tempered at 200 to 250 degrees; if requiring high strength and good toughness, generally 600 to 750 degree of tempering. Crl3 type martensitic stainless phase transition temperature of about 800%, the heating temperature exceeds 800% air-cooling can be achieved martensite.
But when the Nickel-Based Alloys Welded Tubes heating temperature is more than 1050% after the strong carbide precipitation during tempering process, so reducing the corrosion resistance of the steel, and therefore crl3 type martensitic stainless steel quenching temperature should be selected.
There are a lot of seamless material, which is one of martensitic stainless steel, stainless steel seamless pipe market is a major production materials martensitic stainless steel, but the production of seamless steel pipe requires a series of processing, technology high complexity, tempered martensitic stainless steel is more important production processes. After tempering cooling faster, on the one hand to avoid temper brittleness, on the other hand tempering slow cooling will produce prop's body, so that the corrosion resistance is lowered.
The preliminary heat treatment can be done in order to prepare for the future organization of surface hardening, nitriding,In general, high carbon martensitic stainless steel welding required before preheating, post weld heat treatment should preferably not be welded. From the viewpoint of corrosion resistance, the use of low-carbon martensitic stainless steel and tempering more favorable.
With the increase of quenching temperature, chromium carbide (Cr23c6) continuous dissolution, hardness and corrosion resistance is likewise rising. Tempering often use 200 ~ 300%: tempering to eliminate internal stress generated during quenching without causing significant changes within the steel structure for the purpose, and maintain high hardness stainless steel parts. Tempering is taking air cooling. Mechanical properties for the purpose. Require high wear resistance, good flexibility and corrosion resistance of the mold, measuring tools, cutting tools and stainless steel springs and other components is commonly used after quenching and tempering. Martensitic stainless steel after quenching and tempering should be avoided in the range of 400 to 600 degrees. Tempering time is 2 ~ 4h, gets tempered martensite., and to improve the workability of the steel

According to metal powder supplier, a lot of steels exist several or even more alloying elements, When several elements coexist on the stainless steel this continuum, decided stainless organization is the sum of the influence of various elements.0007%) of boron in the austenitic stainless steel can make heatstate plasticity be improved; boron to improve the hot strength of steel have good effect, make the hot strength of stainless steel be significantly improved; boron chromium-nickel austenitic stainless steel has a special use in the atomic energy industry. The disadvantage of this type of stainless steel is low mechanical properties, sensitive to intergranular corrosion and stress corrosion, but by the right amount of alloy additives or process measures can improve or eliminate. Performance of the stainless steel except for process factors, mainly depends on the composition of its internal organization, and is the sum of the various alloy elements in the steel constituting the stainless steel tissue. High-chromium ferritic stainless steel was added .
Various elements impact stainless steel u-tube manufacturers on the organization of stainless steel, according to its commonality, to sum up, basically belong to two categories: one is the formation of stable austenite elements, they are carbon, nickel, manganese, nitrogen, copper, the role of carbon and nitrogen is the greatest; the other is formed of the ferrite element, which is a chromium, tungsten, molybdenum, niobium, silicon, titanium, vanadium, aluminum or the like, this type elements form ferrite, such as chromium is to be compared, the role of the other elements were larger than the chromium. The coexistence of these two types of elements in stainless steel, stainless steel tissue depending on the results they influence each other.
Adding the right amount of nickel in the chromium grade stainless steel matrix elements.005% of boron powder, can make the corrosion resistance of steel in boiling 65% acetic acid be improved; added trace If the stable austenite elements role residing in the main aspects, the organization of stainless austenitic-based, rarely even no ferrite; if their role is not yet make austenite at room temperature maintained until then, this unstable austenite upon cooling, martensite transformation occurs, and the steel tissue is martensite; if the ferrite element is formed into the main aspects, steel tissue is mainly in ferrolites..12% or less of carbon) adding 8% nickel, the ideal pure austenite structure is obtained at room temperature, this steel is that people generally said non-magnetic stainless steel.
Chromium-nickel stainless steel such as the same amount of chromium ferritic or martensitic acidproof stainless steel comparison, not only has a higher corrosion resistance, and more important to mention that they have a good cold deformation so that hardening and welding properties, in ambient temperature or low temperature with high plasticity and toughness, and excellent performance of the non-magnetic, etc.0006 to 0. Such as in the ferritic steels of the chromium-containing 18% of the low-carbon . but the stainless steel containing boron will cause reduced ductility and toughness. Source:.Because of adding these elements, resulting in the change of the internal organization of the steel, so that make the steel have special properties. Therefore, the performance of stainless steel, in the final analysis, is mainly determined by the alloy elements

For example you can get a pair of surgical seamless steel pipe earrings in black for only $13 on Amazon. They will only cost you a fraction of the cost of other metals. They will last you a lifetime and will suit any clothing style that you have. Most jewelry manufacturers make a lot of their jewelry in stainless steel capillary pipe so you have a wide variety of stainless steel pipe jewelry to choose from. After all, you will not keep your first piece in after your piercing as healed, more then likely you will want to change it to something less generic; something that is more your own style. So how can we get the most fashionable jewelry while not spending all our money? That;s where jewelry items like stainless steel earrings and chains come in. As well, your earrings do not need to come in a silver color!

You can get them in black as well. Others have gone on to say that the look of the steel was perfect for their ear and was very comfortable to wear. When you first get your ears pierced, stainless steel pipe earrings are generally what the piercer will use as your first ear jewelry. One piece of jewelry a lot of people opt to get in this material is stainless steel pipe earrings.Stainless steel pipe will give you the same slick look that silver will for hardly a fraction of the cost of silver. We all love to wear jewelry. stainless steel capillary pipe earrings will come in any size of earring you need and N08825 Incoloy tube you can get them in studs or loops. If you;re still not convinced that seamless steel pipe is the way to go when it comes to purchasing beautiful jewelry at a cheap cost, think of some of these customer comments.

 You will have endless options in various styles that will suit any age group or social scene. Stainless steel pipe earrings and jewelry are affordable. Jewelry isn;t cheap. Customers of stainless steel pipe products have said that for the over all quality and look of the product they received, the price was unbelievable; another customer states they would purchase several more sets of stainless steel pipe earrings in the future just because of the affordability. Nice looking jewelry will enhance any outfit.

 Generally you can also choose a different earring piece, but the piercer generally will tell you to choose stainless steel as your first piece because it cuts down on the risk of infection and is more cost effective. The issue of course is the cost.com! These earrings are usually unisex unless you are going for something that is clearly feminine such as heart studs. For your first piece of ear jewelry however, you will more than likely be getting stainless steel capillary pipe earrings for the cost benefits and the protection against infection after your piercing. We all pride ourselves on having a collection of the most fashionable and up to date jewelry