Q355b large diameter thick wall welded pipeHow much do you know about the 11 characteristics of

announcer:hp709HP180518493 release time:2021-12-13 21:40:59

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.

Application of hot rolled steel pipe: the disadvantage of changing hot rolled steel pipe into seamless steel pipe with fixed specification and model is another major feature of hot rolled steel pipe. In the production process, hot rolled steel pipe has been widely used, especially in large equipment such as oil cylinder production, bridge construction, engineering column, large drum and so on. Save materials and labor for the above enterprises, reduce production costs improve the market competitiveness of finished products, and promote the development of enterprises to a certain extent. Continuous pipe is committed to producing all kinds of circumferential seam, longitudinal circumferential continuous pipe and penstock, and is reformed on the basis of the same specification and model of traditional pipe rolling equipment. The function of parameters of pipe rolling equipment is improved by 30%, which fills the gap that can not be produced by traditional steel rolling equipment. It can produce steel pipes with diameter of more than 400 and wall thickness of 8-100mm.

.Thick wall coiled pipe is not only used to transport fluid and powdery solids, exchange heat energy, but also a kind of economic steel. Building structural grid with steel can reduce weight, save metal by 20 ~ 40%, and realize industrialized mechanized construction. Building highway bridges with steel can not only save steel and simplify construction, but also greatly reduce plot, investment and maintenance Maintenance cost. Thick wall coiled pipe is mainly used in tap water engineering, petrochemical industry, chemical industry, electric power industry agricultural irrigation and urban construction. It is mainly used in tap water engineering, petrochemical industry, chemical industry, electric power industry, agricultural irrigation and urban construction. It is one of the key products of development. It is used for gas transmission: gas, steam and liquefied petroleum Gas: used as pile driving pipe, bridge, wharf, road, building structure pipe, welding wire shape and position parameters, flux flow, flux process performance and weld forming.

.The convex hull on the surface of the crimp roll shall be treated. Before repeated processing, the equipment surface shall be treated to prevent the convex hull steel plate with abnormal roll surface from causing pits.

All continuous pipe welds shall be penetration tested.

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, 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, thick wall coil has the disadvantages of low cost, rapid delivery, 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 straight welded pipe and spiral welded pipe. According to the purpose, it is divided into general welded pipe,20# large diameter thick wall 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, 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, idler pipe, deep well pump 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 stainless steel coil, the oil cylinder pushes the welded steel pipe to move on the roller table L360 coil and 16Mn coil. The inspection is strict and the quality is preferential


Q355b large diameter thick wall welded pipeHow much do you know about the 11 characteristics of



This measurement method overcomes the problem of steel

The principle of encoder length measurement is to install an encoder at the oil cylinder, and a series of photoelectric switches with equal distance are installed on the other side. When the steel pipe is pushed by the oil cylinder and the pipe end touches the photoelectric switch, the distance of the oil cylinder can be converted from the recorded encoder reading, so that the length of the steel pipe can be calculated.

The so-called expanding diameter actually belongs to the pressure processing technology that uses hydraulic or mechanical pressure to apply customized to the inside of the steel pipe, so as to expand the steel pipe outward along the radial direction. Mechanical mode is simpler and more efficient than hydraulic mode, so it is more common in practical application. In particular, it is adopted in the very advanced expanding process of several large-diameter straight seam rolling pipelines.

Welcome calls .Main technical measures for low hardening trend

Since the groove sizes of longitudinal and circumferential joints of hot-rolled pipes are different, it is necessary to confirm whether the inner side is upward before plate rolling to ensure the correctness of groove direction.

The main problem of thick wall coiled pipe is welding. As long as flaw detection can be carried out,Q345B welded steel pipe, the requirements related to delivery are wider than other products. The detection of thick wall coiled pipe is mainly ultrasonic flaw detector.


Q355b large diameter thick wall welded pipeHow much do you know about the 11 characteristics of



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, fast delivery and low cost. Cold rolled thick wall pipe is mainly used for: pipe, billboard, column etc.

Professional is king.Finish machining is performed below, and after shot peening, the scales on the inner and outer surfaces of the elbow are removed, and both ends are processed with grooves to facilitate welding.

The excess oxygen in molten steel is removed to achieve the required key water components. The deoxidizer and alloying agent used are Fe & amp; amp; amp; mdash; Mn,Fe& amp; amp; mdash; Si,Si& amp; amp; mdash; Mn and A1, etc. The general addition sequence is to start from the deoxidation ability, add two additives, and add them to molten steel and ladle.

The process of heating the whole thick wall coil or welding area before welding is called preheating. For the steel with high welding strength grade, it has hardening trend, material, especially good thermal conductivity, weldment and large thickness. When the ambient temperature around the welding area is too low, Q19 q23 q34 16Mn, etc. coil is a kind of welded pipe product with simple and flexible process. If the length required by the customer is special, two or more steel pipes must be connected. Therefore, the process of this welded pipe is flexible, convenient and applicable. The disadvantage is that it can not be produced by mechanized line. The level of automation and mechanization is not high, which requires a lot of manual processing. The main problem of coiled pipes is welding. Thick wall coiled pipes can be delivered as long as they can be inspected by flaw detection. The relevant requirements are broader than other products.

Move the steel pipe twice to weld and reinforce the rolled pipe joint, and then transport it to the welding platform for welding.

It should be noted that in practice, it is difficult to achieve the ideal proportion of metal sand and metal ball in the rinsing agent, because the hard and brittle metal sand has a higher crushing rate than the metal ball. For this reason, the mixture should be sampled continuously and the mixed rinse should be tested. According to the particle size distribution, the new rinse agent is added to the cleaning machine, and the amount of metal sand is usually the same in the new rinse agent.