Q235B large di
Q235B welded pMain technical measures for low hardening trend
Cold rolled thick wall continuous pipe is similar to cold rolled thick wall continuous pipe, with wall thickness of 20mm and outer diameter of 450-3000mm. Steel plate is directly rolled, welded, formed, butted and reinforced. Cold rolled thick wall pipe has the characteristics of short processing time,16Mn large diameter thick wall coiled pipe, fast delivery and low cost. Cold rolled thick wall pipe is mainly used for: pipe, billboard, column, etc.
.In order to realize the welding process of high frequency welding of steel plate, the charge induction between welding wire and welding coil is used to heat the weld to the edge of the weld. High frequency welding is a kind of induction welding (or pressure welding). It does not need welding filler and welding. It has narrow welding heat affected zone, beautiful welding shape and good welding mechanical properties. Therefore, it is widely used in steel pipe production. The pressure test of continuous pipe is carried out according to its specification and thickness, and its pressure bearing is also different. This thickness of welded pipe can withstand about 4kg to 10kg. I have been engaged in all kinds of hot-rolled steel pipes, large-diameter thick wall coiled pipes, thick wall straight seam coiled pipes, steel casing, coiled pipe factory and other materials all year round. I operate in good faith. Welcome to call! The following are the pressure test results of various pipes: specification working pressure (MPA) hydrostatic test pressure (MPA) ordinary steel pipe 00 thickened steel pipe 60 ductile iron socket straight pipe allowable pressure socket straight pipe dn40-dn250 allowable working pressure (PFA) 5-4mpa 4-4mpa large allowable working pressure (PMA) 0-7mpa 5-7mpa allowable test pressure (pea) 5-6mpa prepared according to standard metallography, Make the cut sample into metallographic sample. After 4% corrosion was removed from the ultrasonic generator, metallographic analysis was carried out on JSM-5610LV scanning electron microscope.
The distance between the two longitudinal slits of the reel assembly shall be greater than 100mm. The distance between the outer wall of the branch pipe and the weld shall not be less than 50mm.
.The misalignment of butt weld of coiled pipe shall not exceed 20% of wall thickness and shall not exceed 2mm. Butt joint of two pipes with small adjacent deviation value.
Thick wall coiled pipe is usually higher than dn450. Thick wall coiled pipe is sometimes two welds. Why does this happen mainly because of raw material problems and equipment processing problems? The steel plate with the required width of welded pipe required by the customer is usually not produced by the steel plant, so two plates need to be welded, so the weld will occur. The main problem of thick wall coiled pipe is welding. As long as flaw detection can be carried out, the requirements related to delivery are wider than other products. The detection of thick wall coiled pipe is mainly ultrasonic flaw detector. The longitudinal weld on the same cylindrical part of the coiled pipe shall not be greater than 2. When the coil pipe is butt welded, the corresponding parts shall be flushed to. When the nominal diameter is larger than the inner seal, the bottom seal welding shall be carried out. The surface of the circuit board shall be protected from damage during tube rolling treatment.
The rolling pipe production technology requires that the rolling pipe weld is a double-sided weld, two longitudinal welds are allowed, and the weld spacing exceeds 300 mm. The welding appearance and quality standard shall not be lower than the level standard in the welding specification.
Rolled pipe is divided into straight seam rolled pipe and T-shaped welded pipe. The pipe rolling can meet the market demand for less number and more models of welded pipes. It can be used for pipe pile, column, conveying fluid, pressure vessel, etc. The longitudinal weld of the same barrel section of high pressure and high temperature continuous pipe shall not exceed two courses, and the spacing between the two longitudinal welds shall not be less than 200mm.
Large diameter thick wall coiled pipe is usually higher than dn450. Large diameter thick wall coiled pipe sometimes has two welds. The reason why this happens is mainly because of raw material problems and equipment processing. Steel mills usually do not produce steel plates with the required width of large-diameter welded pipes required by customers. Therefore, two plates need to be welded, so welds will occur. Large diameter thick wall coiled pipe can mainly carry out flaw detection, and the requirements related to delivery are wider than other products. Ultrasonic flaw detector is mainly used to detect large-diameter thick wall coiled pipe. The same circular joint of coiled pipe shall not be greater than 2.
Extend the length of the part: 566, divide it into 24 equal parts, symmetrical, and the length of each bisector from the middle to the side is: 11 110 106 10 93 84 75 66 57 0, 50 44 40 39 2.
market.Due to the continuous application of thick wall coiled pipe in industry and the continuous expansion of its scope, it has many advantages. In order to prevent the thick wall coiled pipe from rusting, we can apply antirust oil on the surface of the thick wall coiled pipe.
In general, the hot coil pipe is mainly committed to the production of all kinds of circumferential seam and longitudinal ring coils and steel penstocks. It is reformed on the basis of traditional coil equipment and similar specifications and models, so that all parameters of the hot coil pipe can be improved, in terms of processing technology, the hot coil pipe needs attention. The following matters are required: before processing, the hot coil pipe needs to be familiar with the technical requirements of paper, process material properties and other related aspects, select an appropriate hot coil machine, determine whether the cold coil, warm coil or hot coil, and then operate.
Thick wall coiled pipe sometimes has two welds. Why does this happen? It is mainly due to raw material problems and equipment processing problems. The width of the welded pipe required by the customer is not produced by the steel plant, so the two plates must be welded, the delivery can be carried out. The relevant requirements are broader than other products. The detection of thick wall coiled pipe is mainly ultrasonic flaw detector, and the longitudinal weld on the same cylinder section of coiled pipe should not be more than two. The group of butt welds of coiled pipe shall be flush. When the nominal diameter is greater than, back sealing welding shall be carried out in the pipe. During pipe rolling processing, the surface damage of the plate shall be prevented. High cost. Hot rolled thick wall coiled pipe is widely used: oil cylinder, hydraulic pressure, bridge, roller, etc& amp; amp; quot; Compared with seamless steel pipe thick wall coil has the disadvantages of low cost, rapid delivery, breaking the fixed specification of seamless steel pipe, it is divided into straight welded pipe and spiral welded pipe. According to the purpose it is divided into general welded pipe, galvanized welded pipe oxygen blowing welded pipe, wire sleeve, metric welded pipe, idler pipe, automobile pipe, transformer pipe, electric welding thin-wall pipe, electric welding special-shaped pipe and spiral welded pipe. Objective knowledge packaging strategy thick wall steel plate coil - thick wall steel plate coil price thick wall coil is formed by bending steel plate or steel strip, with the electrical model of 031 inspection 8517611 standard, and then made by high-frequency welding and submerged arc welding. According to the weld form, it is divided into straight welded pipe and spiral welded pipe. According to the purpose, it is divided into general welded pipe, galvanized welded pipe, oxygen blowing welded pipe, wire sleeve, metric welded pipe, idler pipe, automobile pipe, transformer pipe, electric welding thin-wall pipe, electric welding special-shaped pipe and spiral welded pipe, coil, Q235B coil, Q345B coil, large-diameter thin-wall coil large-diameter thick wall coil, L360 coil and 16Mn coil. The inspection is strict and the quality is preferential
Cold rolled thick wall continuous pipe is similar to cold rolled thick wall continuous pipe stainless steel coil,Q355b large diameter thick wall coiled pipe, welded, formed, butted and reinforced. Cold rolled thick wall pipe has the characteristics of short processing time, fast delivery and low cost. Cold rolled thick wall pipe is mainly used for: pipe, billboard, column, etc.
How much is it.The wall thickness of hot coil thick wall continuous pipe is generally greater than 20mm, and the outer diameter range is 450-3000mm. Hot rolled thick wall continuous pipe is rolled, reinforced, flaw detected and delivered under the condition of steel plate heating. Sometimes the wall thickness is very special and needs secondary heating. It is characterized by small outer diameter tolerance and uniform wall thickness. The main reason is that the hot rolled thick wall continuous pipe will not damage the performance of raw materials. The disadvantages of hot rolled thick wall continuous pipe are long processing time and high cost. Hot rolled thick wall pipe is widely used: oil cylinder, hydraulic, bridge, roll, etc. Compared with seamless steel pipe, thick wall continuous pipe has the disadvantages of low cost, fast delivery, breaking the fixed specification of seamless steel pipe and so on. Thick wall coil is welded by bending steel plate or steel strip. According to the weld form, it is divided into straight welded pipe and spiral welded pipe. It can be divided into ordinary welded pipe, galvanized welded pipe, oxygen blowing welded pipe, wire sleeve, metric welded pipe, idler pipe, deep well pump pipe, automobile pipe, transformer pipe, welded thin-wall pipe, welded special-shaped pipe and spiral welded pipe. It is a special product manufacturing enterprise integrating research, development and service. It has long been specialized in hot-rolled steel pipe, large-diameter thick wall rolling pipe, thick wall straight seam rolling pipe, steel casing and rolling pipe factory. Continuous pipe is committed to producing all kinds of circumferential seam and longitudinal circumferential continuous pipe and penstock, and is reformed on the basis of the same specification and model of traditional rolling equipment. The function of parameters of coil welded steel pipe equipment is improved by 30%, which fills the gap that can not be produced by traditional rolling equipment. It can produce steel pipes with diameter of more than 400 and wall thickness of 8-100mm. The main materials are q23 q34 20, 16Mn, 16Mn, etc. the product standards are GB / t50205-200, GB / t3092-2001, etc. the products are widely used in petroleum, chemical industry natural gas transmission, pile driving, heating, gas supply and other projects.
In recent days, large-diameter steel plate rolling pipe manufacturers continue to operate with small fluctuations. Among them, the market high line and the pile casing lattice for threaded bridge piling in Taiyuan market increased significantly by 70 yuan / ton. On March 25 in Northeast China Shenyang market rose slightly by 30 yuan / ton, and the overall situation remained low inventory low transaction and high. The diameter of spiral steel pipe produced by our factory can be from 219mm to 0mm, and the wall thickness can be from 4mm to 30mm. Main purpose: it is widely used in civil engineering construction such as houses, bridges and roads. The spiral welded steel pipe is rising significantly today. The raw material billet for the production of spiral steel pipe is carbon structural steel or low alloy structural steel after sedation treatment. It has been well used in the chemical industry and agricultural irrigation,Q235B straight seam welded pipe, and has provided good resources for the transportation and construction industries. According to its own structural characteristics, it has two main uses. It is used for transportation such as water supply and drainage. Based on its superior performance, it can also be used for the transportation of gas, petroleum and other chemical substances. It is used for structure, such as pile driving pipe and bridge, as well as pipe for road, wharf and building structure.
Meet the following requirements: 1. The longitudinal joint of butt joint shall not be greater than 10% of the wall thickness plus 2mm, and shall not be greater than 3mm. 2. The longitudinal joint of joint 200mm away from the pipe end shall not be greater than 2mm. 3. Other parts shall not be greater than 1mm. 4. The vertical deviation between the end face of coiled pipe and the center line shall not be greater than percent of the outer diameter of pipe and shall not be greater than 3mm. The straightness deviation shall not exceed 1mm / m. 5 the weld cannot be double-sided molded coiled pipe. When the nominal diameter is greater than or equal to 600mm, it is recommended to seal and seal in the pipe. In order to obtain better uniform cleanliness and roughness distribution, the particle size and proportion design of rinse agent is very important. The roughness is too large, which may cause the anti-corrosion layer to become thinner at the peak of the cloud path. At the same time, because the cloud path is too deep, bubbles are easy to form in the process, which seriously affects the performance of the layer.
.Main technical measures for low hardening trend
Pipe groove processing and joint pair: when the pipe wall thickness is less than 6mm, it is type I weld; when the pipe wall thickness is greater than 6mm, it is type V weld; For pipes with diameter greater than 600mm and wall thickness greater than 6mm, the bottom of the pipe shall be sealed at the bottom of the pipe; In addition to the lap joint, the weld must be re welded. Rewelding shall not be more than twice. The longitudinal weld of coiled pipe in the same cylindrical part shall not be greater than, and the spacing between two longitudinal joints shall not be less than 200mm.
The production process of thick wall welded pipe can be divided into cold rolling, cold rolling and hot rolling. The steel pipes are made of 10, 20, 35 and 45, which are referred to as ordinary steel pipes for short, and 16Mn is between ordinary steel pipes and alloy steel pipes. This material is called low alloy steel pipe, the steel pipe materials are 27SiMn, 12Cr1MoV, 10crmo9, 15CrMo and 35CrMo, and the stainless steel pipe is collectively referred to as alloy steel pipe. According to the use, it is divided into structural seamless steel pipe; Seamless steel pipe transportation; Seamless steel pipe for boiler; High pressure seamless steel pipe for boiler; High pressure seamless steel pipe for fertilizer equipment; Seamless steel pipe for geological exploration; Jointed steel pipe; Seamless steel pipe for petroleum cracking; Marine seamless steel pipe; Cold drawn cold rolled precision seamless steel pipe; Various alloy pipes.