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What is the manganese content of straight seam coiled pipe? The material of straight seam coiled pipe and an appropriate amount of manganese 1 can significantly improve the cold brittleness of straight seam steel pipe steel, increase the yield strength and tensile strength, reduce the plasticity and impact toughness, and do not be too large; 4 manganese has an effect on the removal of harmful element oxygen in steel; 5MN can also be used to synthesize high melting point (about 1600 ℃, much higher than the general processing temperature of steel), which is at high temperature in steel, so it can reduce the harmful effect of sulfur and lead to hot processing of steel. Sulfur cracked & ldquo; Hot crisp & rdquo; The phenomenon has decreased.
.Executive standard for steel plate rounding: structural tube gb8162-2008 fluid tube gb8163-2008 low and medium pressure boiler tube gb3087-2008 high pressure boiler tube GB5310-2008 special tube for chemical fertilizer GB 79-2000 petroleum cracking tube gb9948-88 steel plate rounding production process: tube blank & mdash& mdash; Inspection & mdash& mdash; Peel & mdash& mdash; Inspection & mdash& mdash; Heating & mdash& mdash; Perforation & mdash& mdash; Pickling & mdash& mdash; Grinding & mdash& mdash;Air drying & mdash& mdash; Welding head & mdash& mdash; Cold drawing & mdash& mdash;& mdash;& mdash; Pickling and passivation & mdash& mdash; Inspection & mdash& mdash; Cold rolling & mdash& mdash; Degreasing & mdash& mdash; Cutting head & mdash& mdash; Air drying & mdash& mdash; Internal polishing & mdash& mdash; External polishing & mdash& mdash; Inspection & mdash& mdash; Identification & mdash& mdash; Process flow inspection of finished product packaging industrial pipe & mdash& mdash; Peel & mdash& mdash; Inspection & mdash& mdash; Heating & mdash& mdash; Perforation & mdash& mdash; Pickling & mdash& mdash; Mushroom trimming & mdash& mdash;Air drying & mdash& mdash; Welding head & mdash& mdash; Cold drawing & mdash& mdash; Solution treatment & mdash& mdash; Pickling & mdash& mdash; Pickling and passivation & mdash& mdash; Formula of steel plate rolling weight: [(outer diameter wall thickness) * wall thickness] * 0.02466 = kg / M (weight per meter)
The steel plate or strip is bent and then welded to form a thick wall coil. According to the welding form, it is divided into straight seam welded pipe and spiral welded pipe. It is divided into ordinary welded pipe, galvanized welded pipe, oxygen blowing welded pipe wire sleeve, metric welded pipe, rolling pipe, deep well pump pipe, automobile pipe, transformer pipe welded thin-wall pipe, welded pipe and spiral welded pipe. Coil pipe is dedicated to the production of, longitudinal ring coil pipe and steel pressure pipe, and is modified according to similar specifications of traditional rolling equipment. The function of increasing the parameters of spiral steel pipe equipment by 30% fills the gap that the original traditional rolling equipment can not produce. It can produce steel pipes with a diameter of 400 or more and a wall thickness of 8-100mm. The material mainly includes q23 q34 20#, 16 manganese, 16 manganese capacity, etc. Product executive standards include: GB / t50205-2001, GB / t3092-2001, etc. The products are widely used in petroleum, chemicals, natural gas transportation, pile driving, urban water supply, heating, gas supply and other projects.
.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 pipeline installation sequence shall be adopted according to the principle of zoning and subsystem. First the lower level, then the upper level, and then the difficulty. In principle the pipes connected to the machine are arranged from inside to outside to reduce the impact of welding stress on the installation accuracy of the machine. The joints of indoor and outdoor pipes shall be left outdoors. Q345B thick wall continuous pipe is a widely used carbon steel material. Q345B thick wall continuous pipe with thickness greater than 10mm is widely used in drainage engineering, sewage pipeline, dredging pipeline construction pipeline, etc. Q345B thick wall continuous pipe is a welded steel pipe product with relatively simple and flexible process. This kind of steel pipe is usually not in stock and is customized. If the quantity is small, the raw materials are not good. The main problem of Q345B thick wall continuous pipe is welding. As long as possible, delivery related requirements can be compared with other products.
For external welding, a larger welding current is used. However, under the condition of high welding current, the stirring effect of molten pool is enhanced, and the melting amount of welding wire increases accordingly, resulting in the increase of weld reinforcement, the deterioration of weld formation and poor edge transition.
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. During pipe rolling treatment, it shall be protected.
When the pipe is rolled, the distance between the two welds shall be greater than 100mm, the production process of thick wall coiled pipe can be divided into cold drawing and hot rolling. The production process of cold-rolled seamless steel pipe is generally more complex than hot rolling. Roll sizing test shall be carried out for the pipe blank first. If the surface does not respond to the crack, the round pipe shall be cut by a cutter and cut into a blank with a length of about meters. However, when entering the annealing process, acid shall be used for annealing, and attention shall be paid to whether a large number of bubbles are generated on the surface. If a large number of bubbles are generated, it indicates that the quality of steel pipe can not meet the response standard. In appearance, the cold-rolled seamless steel pipe is shorter than the hot-rolled seamless steel pipe, and its wall thickness is generally smaller than that of the hot-rolled seamless steel pipe, but the surface is brighter than that of the thick wall seamless steel pipe. There is not too much roughness on the surface, quotation, honest operation, genuine and of the same quality. The thick wall coiled pipe is available from stock, with complete specifications,. The wall thickness of coiled pipe is 20mm and the outer diameter is 450-3000mm. It is rolled, formed, butted, removed and reinforced directly from the steel plate. Coil processing time is short and delivery is fast.
, low cost. The rolling pipe is mainly used for pipes, billboards, columns, etc.
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, so this kind of weld occurs. The main problem of thick wall coiled pipe is welding. As long as the flaw detection can be carried out 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, etc. Quality department 3 editing of welding process and welded pipe type thick wall coiled pipe is made of steel plate or steel strip after bending and then welding. According to the weld form, it is divided into general welded pipe, galvanized welded pipe, oxygen blowing welded pipe, wire sleeve, idler pipe, deep well pump 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, deep well pump pipe, automobile pipe, transformer pipe, electric welding thin-wall pipe, coil, Q235B coil, Q345B coil, large-diameter thin-wall coil, large-diameter thick wall coil, stainless steel coil, L360 coil and 16Mn coil. The inspection is strict and the quality is preferential
This measurement method overcomes the problem of steel
Quality inspection report.The products are widely used in petroleum, chemical industry, natural gas transportation, pile driving and urban water supply, heating, gas supply and other projects. The wall thickness of the hot-rolled thick wall coil of retailers generally exceeds 20mm, and the outer diameter range is 450-3000mm. The hot-rolled thick wall coil is rolled, welded, formed, de reinforced, flaw detected and delivered under the state of steel plate heating. Sometimes the wall with special thickness needs secondary heating. It is characterized by small outer diameter tolerance and uniform wall thickness. The main thing is that the hot-rolled thick wall quality management coil will not damage the performance of raw materials. The disadvantages of hot-rolled thick wall coil are long processing time and the diameter of thick wall coil is generally above dn450.
Continuous pipe pressure perforation refers to the pressure perforation realized by punch (head) on the press. It belongs to stamping deformation. Large diameter steel pipe rolling can be divided into open and closed. Square billets (some round billets) or polygonal ingots are used for perforation. If the punched metal just fills the space between the pipe wall and the blank, the pressure perforation is an open perforation. If the punched metal is greater than the volume of the space, blanking, beveling, steel plate rolling, assembly spot welding, campus, perimeter and roundness deviation inspection, welding, weld inspection, pipe test and delivery. Professional hot-rolled steel pipe, large-diameter thick wall rolling pipe thick wall straight seam rolling pipe, steel casing, old brands, the surface damage of steel plate shall be prevented. The parts with serious scratches must be polished for transition, and the wall thickness of the polished parts shall not be less than the design wall thickness.
However, the disadvantages of manual cutting and cutting are also obvious, and the quality of the incision is very poor Big size error There is a great waste of materials The post-treatment process has large processing capacity and poor working conditions. Cutting with a forming machine can greatly improve the quality of the workpiece, but the workpiece must be pre machined. It is not suitable for blanking of single chip, small batch and large workpiece. Although the semi-automatic cutting machine reduces the labor intensity, its function is simple and is only suitable for cutting two shapes. Due to the low cost of equipment, the above cutting is easy to operate compared with CNC cutting Easy to operate, so even in some large enterprises, it is still widely used in small and medium-sized enterprises.
Thickness detection thickness detection is very simple, as long as the caliper is OK. Like other pipes.