steel pipe

　　From the past experiments and production practices, it is necessary to control the temperature of the hot-dip galvanized zinc bath to a preferred temperature in the range of 450 to 460'C. When the temperature is high, it will increase the heat consumption, shorten the service life of the steel zinc pot, accelerate the formation of zinc slag and zinc ash, and affect the quality of the galvanized silkworm plastic layer. When the temperature is low, it will affect the ability of seamless steel tube galvanizing, and the zinc layer is thick and uneven due to the decrease in fluidity of the zinc liquid. 　　The experienced hot-dip galvanizing workers manipulated the immersion time by investigating the reaction of hot-dip galvanizing: "Put the seamless steel tube into the immersion bath until the "ubilation" phenomenon stops, and then immediately raise it without delay. It is possible to obtain the thickness of the zinc layer required for the use of the space." 　　S...

　　When the erw pipe blank is put into use, the quality inspection must be carried out one by one or one by one, and the system of “sending steel by furnace” is implemented. The so-called "feeding steel by furnace" system is to organize production, inspection, acceptance and shipment according to furnace No. 1 and batch number, and provide products to users. 　　To ensure the accuracy of the steel number, furnace number and batch number is an important means to ensure the quality of the products. For those steel pipes of important use, such as boiler and heat exchanger steel pipes, automobile transmission shaft steel pipes and steel pipes requiring heat treatment, it is more important. Because the performance of the product and the specification of the thermal process a, it depends largely on its chemical composition. Mixed batches may result in the tube being completely scrapped. 　　When feeding, it should be measured by weight, fill in the original record of the metering me...

　 　Quenching crack of seamless steel tube 　　The quenching heating temperature of the seamless steel pipe is too high, or the heating time is too long, or the heating temperature is severely uneven, which may cause quenching cracks. If the chemical composition of the seamless steel pipe is segregated, the seamless steel pipe may be mixed and easily cause quenching cracks. 　　 Overheating or overburning of seam steel pipe 　　The quenching heating temperature of the seamless steel pipe is too high or the heating time is too long, which may cause overheating or overheating. In severe cases, the seamless steel pipe will collapse. 　 　Surface decarburization or severe oxidation of seamless steel tubes 　　When the seamless steel pipe is heated, the surface is seriously decarburized or severely oxidized due to improper control of heating temperature and heating time or misalignment of air-fuel ratio adjustment. 　　 http://www.xysteelpipe.com/info/Seamless-steel-pipe-heat-treatment-defec...

　　The process of heating a soldered metal to a local melting or reaching a high temperature plastic state by using a current through a contact surface of the weldment joint and an adjacent region, and forming a firm welded joint under external force, is called resistance welding. Resistance welding has the following two characteristics compared with arc welding: 　　(1) High thermal efficiency. In the arc welding, the external concentrated heat source is used to conduct heat energy from the outside to the weldment; while the resistance welding is the resistance heat conduction from the high temperature zone to the low temperature zone, which is an internal heat source. Therefore, the heat energy loss is relatively small and the thermal efficiency is relatively high. 　　(2) The weld is dense. Generally, the weld of arc welding is solidified and crystallized under normal pressure, and the weld of electric resistance welding is solidified and crystallized under the action of external pre...

　　 ERW Steel Pipe Vs Seamless Steel Pipe 　　1. Comparison of wall thickness tolerance between erw steel pipe and seamless steel pipe 　　ERW steel pipe: hot-rolled coil is used as raw material, the thickness limit of modern hot-joining can be controlled within 0.05mm, and the seamless steel pipe is produced by round steel perforation, the wall thickness deviation is large, and the subsequent hot rolling can partially eliminate the wall. Thickness unevenness, but the current advanced unit can only be controlled within ±5~10%t, corresponding to the thickness of 8.94mm steel pipe. 　　Seamless steel pipe: The limit of wall thickness control accuracy is 0.9mm. 　　2. ERW steel pipe and seamless steel pipe compared with outer diameter tolerance 　　ERW steel pipe: adopts cold-bending forming, and the sizing is completed by 0.6% reduction. The process temperature is basically constant at room temperature, so the outer diameter control is accurate and the fluctuation range is small, which is...

　　The main types of lsaw steel pipes for automobiles include automobile automobile silencer pipes, transmission shaft pipes, thrust pipes, condenser pipes, exhaust pipes, steering shaft pipes, and shock absorber oil storage pipes. 　　The lsaw steel valve plate is composed of a vertical plate, a backing plate and a large round steel plate. The valve plate of this structure, the pad battle station board can be indirectly cut, and the small square steel plate requires the craftsperson to first calculate the blanking size, and then press the required shape to make the shaped tire, and the tire will be used. The small square steel plate is repressed and formed. The middle part of the valve plate is curved, and the edge is not a flat surface. Then it is necessary to make a tire for each specification valve, otherwise it is impossible to press out the required shape. The connecting butterfly valve butterfly valve has the advantages of old volume, heavy weight, flexible measures, convenient a...

　　The European Union official gazette said that the EU will launch protective measures on Thursday (19th) to prevent a surge in steel imports into the EU after tariffs on imported steel and aluminum in the United States. 　　The European Commission has proposed a combination of quotas and tariffs to address EU concerns, and the EU is concerned that steel products that are no longer exported to the United States may turn into the European market. 　　The Lianhe Zaobao quoted Reuters as saying that the quota for 23 steel products was based on the import situation in the past three years, and the imported steel products exceeding the quota will be subject to a 25% tariff. 　　According to reports, the countries that export steel to the EU are mainly China, India, Russia, South Korea, Turkey and Ukraine. 　　 http://www.xysteelpipe.com/info/EU-launches-protective-measures-on-the-19th-to-curb-steel-imports-1218-1.htm

　　Pipeline transport with transport capacity, low safety, transportation cost advantages, is the best means of transporting petroleum products. However, because pipeline cracks and defects have a greater impact on the safe operation of the pipeline, cracks in the structure itself is also more complicated. 　　By the intelligent instrumentation detected cracks and defects are generally located inside and outside wall or coating. Cracks and defects in the pipe can generally be divided into two categories: direct cracks and defects, indirect cracks and defects. 　　Cracks and defects directly refers to the state and the wall cracks and defects are directly related . These cracks and defects have a direct impact on the integrity of the pipe or tube sections, such as corrosion, cracks or scratches. Indirect refers cracks and defects relating to the integrity of the pipe material damage or system failure. With the increasing use of time, they can cause a direct pipeline cracks and defects oc...

　　How to choose a suitable venue and seamless steel warehouse 　　(1) steel storage site or warehouse, should be selected in the clean, smooth drainage area, away from harmful gases or dust factories and mines. Presence on the ground to clear all the weeds and debris to keep the steel clean. 　　(2) in a warehouse not with acid, alkali, salt, cement, steel and other aggressive materials stacked together. Different types of steel should be stacked separately, to prevent confusion and to prevent contact corrosion. 　　(3) heavy sections, rails, shame steel, large diameter steel pipe, forgings, etc., may open dumps. 　　(4) small and medium sized steel, wire rod, rebar, in diameter steel pipe, steel wire and wire rope, etc., can be expected in a well-ventilated storage shed, but it must be on the thatch underlay. 　　(5) some small steel, sheet, strip, silicon steel sheet, small caliber or thin-walled steel pipes, all kinds of cold-rolled, cold-drawn steel and high prices, corrosive meta...

　　Widely application of LSAW pressure steel pipe: 　 　1. Definition of lsaw steel pipe pressure pipeline 　　LSAW steel pipe pressure piping should include all straight seam steel pipe pipes that use pressure to deliver gas or liquid. From the point of view of safety production, it is the name of the straight seam steel pipe pressure vessel. Therefore, it is not a pressure pipe in a simple sense. The possibility of accidents and the hazard of the accident define the scope of the straight seam steel pipe pressure pipe. The pressure line uses a certain pressure, a tubular device for conveying gas or liquid, a liquid medium having a temperature higher than or equal to the standard boiling point, and a pipe having a nominal diameter of more than 25 mm. Straight seam steel pipe pressure equipment, in addition to its own blasting, will also cause explosions and fires due to leakage of the medium. 　 　2. Application of lsaw steel pipe pressure pipeline 　　LSAW steel pipe pressure piping is...

　　ASTM A53 steel pipe has a wide range covering several types and grade among seamless and ERW steel pipe. Today, we will have an exact chemical requirements for ASTM A53. This would be supplement for the production description. 　　First of all, we should have a look for the basic parameters for ASTM A53 steel pipe: 　　Types and grades: 　　Type F—Furnace-butt-welded, continuous welded Grade A, 　　Type E—Electric-resistance-welded, Grades A and B, and 　　Type S—Seamless, Grades A and B. 　　And this specification covers seamless carbon steel pipe for high-temperature service 　　Sizes (Seamless): 1/2″ NB – 60″ NB 　　Sizes (ERW): 1/2″ NB – 24″ NB 　　Sizes (SAW): 16″ NB – 100″ NB 　　 http://www.xysteelpipe.com/info/ASTM-A53-steel-pipe-exact-specifications-1191-1.htm

　　The main methods of cutting the seamless steel pipe are cutting machine cutting, machine cutting, flame cutting, sawing, and the like. The characteristics of the pipe cutting equipment are as follows. 　 　(1) Pipe cutting machine 　　The pipe cutting machine is simple in equipment, low in investment, and widely used, and some also have the function of the inverted groove and the automatic loading and unloading material and the collecting device. The pipe cutting machine is a commonly used equipment for seamless thick-walled steel pipe finishing production lines. 　 　(2) Flame cut 　　The flame cutting includes oxygen cutting, hydrogen-oxygen cutting, plasma cutting, etc., and the cutting method is suitable for cutting thick-walled steel pipes with extremely large pipe diameter and thick wall. When plasma cutting, the cutting speed is faster. Due to the high temperature at the time of flame cutting, there is a heat affected zone near the slit and the port surface is not smooth. 　　...

　　Supply Range of Diameters for API 5L welded (ERW, SAW) line pipe: 1/2” to 60” 　　Grade: API 5L Grade B, X42, X46, X52, X56, X60, X65, X70, X80 　　Manufacturing types: ERW, LSAW, SSAW 　　Range of Thickness: SCH10 to SCH160 　　Ends Type: Beveled ends, Plain ends 　　Range of length: 20FT, 40FT or customized 　　Protection Caps in plastic or iron available 　　Surface appearances: Natural, Varnished, Black painting, 3PE, FBE, etc 　　 http://www.xysteelpipe.com/info/API-5L-Welded-Steel-Pipe-1186-1.htm

　　In order to detect LSAW longitudinal weld defects in the weld total length of horizontal or vertical use jet (water column) coupled ultrasonic flaw detection. Jet (water column) ultrasonic flaw detection is between the probe and the pipe coupling by jet, so that the longitudinal wave probe beam emitted by the incident to the interface of water or steel pipe , a steel pipe weld inspection by pure shear wave conversion. Therefore, to achieve the weld pure shear testing, the incident angle of the probe must be between Ⅰ critical angle and the critical angle II, drawn by the law of refraction. Can be obtained by calculating the longitudinal wave is incident from the water to the steel in the first critical angle I and II were critical angle 14.5 ° and 27.3 °. 　　Longitudinal ultrasonic testing: non-destructive testing is on-site detection, rapid non-destructive, without having to reach the lab, greatly improving efficiency. Analysis speed is much faster than desktop spectrometer, only a...

　　The welding temperature of welded steel pipe is mainly affected by the high frequency eddy current, according to the formula (2) shows that the eddy current is mainly affected by the high frequency current frequency, eddy current and current excitation frequency is proportional to the square of the current; excitation frequency and excitation voltage, electric current and capacitance and inductance. Steel pipe production process to meet a lot of conditions, for different situations and design principles, in the industry to continue to use and promote. The excitation frequency formula is: 　　F=1/[2 PI (CL) 1/2]. (1) 　　F- () excitation frequency (Hz); C- excitation circuit in the capacitance (F), capacitance = power / voltage; L- excitation loop inductance, inductance = magnetic flux / current 　　When the heat input is insufficient, is not up to the edge of the weld heating welding temperature, metal structure remains solid, forming fusion or incomplete penetration; when the heat ...

　　 Seamless steel tubes are commonly used in general, the Vivtorinox three hardness indicators to measure the hardness. Seamless steel tubes, the hardness test of the same hardness test is the same as the indentation test method. The difference is that it is measuring the depth of indentation. The hardness test is a widely used method, in which HRC is used in the standard of steel tube, which is only second to the hardness of HB. Rockwell hardness can be applied to the determination of metal materials from very soft to very hard, it makes up for Bridgman is not a Brinell hardness value method is simple, can be read directly from the dial hardness machine. However, due to its small indentation, the hardness is not as accurate as the method of the. 　　In the standard of seamless steel pipe, the most widely used, the indentation diameter is often used to indicate the hardness of the material, both intuitive and convenient. But it is not applicable to the hard or thin steel. Vivtorinox h...

　　Pipe coupling according to the pipe end can be divided into: light pipe (pipe end without threads) and threading pipe (pipe end threaded). 　　Car wire tube is divided into: general threading pipe and threading pipe end upsetting. 　　Thick threading pipe can be divided into: EUE (with external thread), internal upset (with internal thread) and internal and external thickening (with external threads), etc. threading pipe. 　　If you press threading pipe thread type can be divided into: ordinary cylindrical or conical screw thread and other places of special threading pipe. In addition, according to user needs, threading pipe is generally equipped with fittings delivery. 　　Check www.tjxysteel.com for more info

　　Longitudinal straight seam welded pipe butt weld joint cross-sectional shape, depending on the thickness of the body to be welded before welding groove and then type two sides. When welding thick steel plate, for penetration in contact at the edges out of various shapes of the groove, so that more easily into the welding rod or wire. Groove patterns are one-sided welding the welding groove and the sides of the groove. When you select groove type, in addition to outside should be considered to ensure penetration welding convenient, less filler metal Chi, small welding deformation and beveling of Longitudinal low cost factor. 　　Linker connecting the two is in the welding Longitudinal seam formed called weld. Both sides of the weld in the welding welding heat effect will be, but the organization and performance vary, this area is known as the heat affected zone. Welding due to the workpiece material welding materials, Longitudinal welding current so different, after welding may occur...