Q345B welded steel pipeEconomic investment approach

With the development of domestic economic situation and the acceleration of welding and casting trend, the advantages of NC cutting are gradually recognized. It has long provided various brand products such as hot-rolled steel pipe, large-diameter thick wall rolling pipe, thick wall straight seam rolling pipe, steel casing and rolling pipe factory. The designated products are complete and the quality is guaranteed. NC cutting not only greatly improves the rate of plate and product quality, but also improves the working environment and labor efficiency. At present, the NC cutting machines used in the thick wall coil processing industry are mainly flame and ordinary plasma cutting machines, but pure flame cutting can not meet the needs of modern production. At present, most NC cutting machines are NC plasma cutting machines. This type of cutting machine can meet the needs of thick wall coiled pipe plate processing and thick wall coiled pipe parts processing, so the demand will be greater and greater, but there is still a very obvious gap with foreign countries, which is mainly reflected in: 90% of the developed thick wall coiled pipe processing industry is digital control cutting machine and only 10% is manual cutting; The CNC cutting machine only accounts for part of the total blanking. 10%, of which the proportion of NC plasma cutting is small. In industrial production, the thermal cutting of thick wall coiled pipe generally includes gas cutting plasma cutting, laser cutting and so on. Among them, plasma cutting has a wider cutting range than gas cutting More efficient. Fine plasma cutting technology is close to laser cutting in material cutting surface quality,20# large diameter reel, but the cost is much lower than laser cutting. Therefore,45# straight seam welded pipe, since the successful development of the United States in the mid-1950s, plasma cutting has developed rapidly. With the rapid development of computer and digital technology, NC cutting is also developing, which improves the machining accuracy. It shows great advantages in saving materials and improving labor productivity. This leads to the development of plasma cutting technology from manual or semi-automatic to NC, which has become one of the main directions of NC cutting technology. NC plasma cutting technology is a set of high-tech technologies such as NC technology, plasma cutting technology and inverter power supply technology. Its development is based on the common progress of computer, plasma arc characteristic research, power electronics and other disciplines. The CNC cutting technology began in the 1980s, and the CNC plasma cutting technology was later. However, recently, some domestic universities, research institutes and manufacturers have studied NC plasma cutting technology and gradually developed and produced various specifications of NC plasma cutting equipment, narrowing the gap of foreign advanced technology.

In the production process, the hot-rolled steel pipe has the characteristics of no raw materials, that is, the mechanical properties of thick wall steel plate. In this way, the steel plate is heated first and then rolled, which softens the steel plate under great conditions, which will not affect the material quality nor damage the properties such as strength, yield and tensile strength. For the wall thickness that can not be achieved by cold rolled steel pipe, the specification and model of thick wall steel pipe are added.

.After cutting into a single steel plate coil, including the mechanical properties, chemical composition, fusion status of the weld, and the nondestructive testing of steel plate coil. Only after the pipe making process is qualified can it be officially put into production.

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 pipeline installation sequence is based on the principle of sub area and sub system, with small diameter, from difficult to easy, from the pipe gallery to the equipment. In principle, the pipeline connected with the machine is configured from the inside to the outside to reduce the impact of welding stress on the installation accuracy of the machine. The interface between indoor and outdoor pipelines shall be left outdoors. Q345B thick wall coiled pipe is a kind of material in carbon steel and is widely used. The thickness of Q345B thick wall coiled pipe is generally more than 10mm, which is widely used in drainage engineering,20# thick wall coiled pipe, sewage pipeline, dredging pipeline construction pipeline, etc. Q345B thick wall coiled pipe is a welded pipe product, and the process in the welded pipe is relatively simple and flexible. This type of steel pipe usually has no inventory and is processed by user. If the quantity is small, the raw materials are not good. The main problem of Q345B thick wall coiled pipe is welding. As long as it is possible, the delivery related requirements can be compared with other products.

Today's equipment is double-sided submerged arc welding, because it goes without saying that double-sided welding is necessary here.

The steel plate rolling pipe we call the steel plate rolling pipe is actually a process. The following small series will describe the process sequence: plate inspection, 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, rolling pipe factory and other special products, old brands, price advantages and guaranteed quality. These processes can not be less.

Thick wall coiled pipe is made of steel plate. Thick wall coiled pipe can be divided into coiled pipe and thick wall coiled pipe. The wall thickness of coiled pipe is 20mm and the outer diameter is 450-3000mm. It is rolled, welded, formed, butted, removed and reinforced directly from the steel plate. Coil pipe processing time is short and delivery is fast Low cost. The rolling pipe is mainly used for pipes, billboards, columns etc.

Meet the requirements of American Petroleum Institute standards.

In the process we mentioned, we need to explain each process, such as groove. We need to compact both sides of the steel plate with indenter, so as to avoid the formation of peach shaped mouth in the rolling pipe.

Excellent quality.If the top wall thickness of the pipe is equal to the bottom wall thickness the formula can also be simplified as: (top inner diameter + bottom inner diameter) * 1 / 2 * 0.02466 * pipe length = weight inspection of conical special-shaped coil. 16Mn thick wall coil adopts advanced technology. Jbq6xvzt52aj5 Shenzhen thick wall coil has good use characteristics and performance in use and can show important value and role. The specific functions and values of 16Mn thick wall coil are as follows: it can coil suitable quantitative and wide steel strip and Shenzhen thick wall coil into parallel coils with required inner diameter and wall thickness; The roller is driven by active stepless speed regulation, with small mandrel deformation, high pressure of Shenzhen thick wall winding pipe, strong winding force of Shenzhen thick wall winding pipe, high power transmission efficiency, good winding strength and flat appearance; With self-locking function, the swing arm can be automatically locked without shaking after angle adjustment; With automatic cutting device, the incision is neat without warping angle, and the cutting length of Shenzhen thick wall coiled pipe is optional and adjustable. To operate by two people. 16Mn thick wall coiled pipe is durable and stable in use. Shenzhen thick wall coiled pipe is easy to operate. According to the safety and health standards, the rolling pipe is committed to producing all kinds of rolling pipes and steel penstocks with circumferential seams and longitudinal rings, 16 manganese, 16 manganese capacity, etc. Product executive standard: GB / t50205-200, GB / t3092-2001, etc. 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 process of designing brand inspection standard thick wall straight seam coiled pipe is generally rolled. If the diameter required by the customer is particularly large, it is difficult for Shenzhen thick wall coiled pipe like machinery and equipment. Shenzhen thick wall coiled pipe needs to be rolled. After the steel plate is rolled, Shenzhen thick wall coiled pipe will weld two rolled steel pipes, The weld formed by Shenzhen thick wall coiled pipe is also called t-weld. Sometimes, two steel plates need to be rolled and welded for thick wall straight seam steel. D7z3xjb87v21w, so two welds may appear in one pipe body, also known as double welds. Thick wall straight seam coiled pipe has a wide range of materials. As long as it is a steel plate that can be ordered in a steel plant, X ahzpdqsqu7 is basically OK. The main problem of the product is the welding quality. The welding quality directly determines the quality of the product. Shenzhen thick wall rolling pipe is the main step in thick wall rolling pipe. Suitable for buildings, bridges, dams

The diameter of large-diameter thick wall coiled pipe is generally above dn450. Long term supply of hot rolled steel pipe, large diameter thick wall rolling pipe, thick wall straight seam rolling pipe, steel casing, rolling pipe factory, old brand, price advantage and quality guarantee! Sometimes there are two welds for large-diameter thick wall coiled pipe. Why does this happen? It is mainly due to the problems of raw materials and equipment processing. The steel plate with the required width of large-diameter 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 large-diameter 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 large-diameter thick wall coiled pipe is mainly ultrasonic flaw detector, and the longitudinal weld on the same barrel section of the 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.

In addition, when the pipe rolling equipment is made, we should not have more than two longitudinal welds on the same cylinder section of the pipe rolling. For long-term pipe rolling, Q235B pipe rolling, Q345B pipe rolling, large-diameter thin-wall pipe rolling, large-diameter thick wall pipe rolling, stainless steel pipe rolling, L360 pipe rolling and 16Mn pipe rolling, the products are complete, the quality is excellent and the price is favorable. The distance between the two longitudinal welds should not be less than 200.

Welding voltage because the welding arc is conical, and the welding voltage directly affects the length of the arc. Therefore, with the increase of welding voltage, the arc length increases, the moving range of arc spots expands, the weld pool widens, the external welding of spiral welded pipe is carried out on the slope, and the molten weld metal will flow laterally under the action of gravity. It can be seen that the larger the welding voltage and the wider the weld pool, the more serious the trend of lateral flow of weld metal, * eventually leading to the bias flow of weld metal. Coil products are not only rich in types, but also diversified in processing technology and molding. In most cases, after forming, the next process is to expand the diameter of the welded pipe blank to improve the quality of welded pipe shape. In other words, the expanding process has become an important process to ensure the quality of finished pipe in the production of large-diameter straight seam coiled pipe.

Statistics.This measurement method overcomes the problem of steel

The utility model is characterized in that the on-line measurement can be realized, and the length data of the steel pipe can be obtained in the length measurement area without interval. The disadvantage is: if the special light source is not used for irradiation, due to the high brightness of the pipe end after chamfering, the light reflection is very strong, which is easy to cause reading error.

Hot melt installation: pipes are connected according to the nature of thermoplastic coiled pipes. During hot melt, special heating equipment (generally electric heating type) is used to make the connecting surface of coiled pipes of the same material and pipe fittings reach the molten state, safe and durable, and avoids water running, emitting, dripping and leakage at the joint of metal pipe fittings.

.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 4-100mm. The main materials are q23q3420, 435cimo and 42cimo, 16 manganese and 16 manganese capacity. Generally speaking, cold-rolled sheet can be used for pipe rolling. Product standards: GB / t50205-200, GB / t3092-2001, etc.

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, natural gas transmission chemical industry, pile driving, urban water supply, heat supply, gas supply and other projects. The detection of thick wall continuous pipe is mainly ultrasonic flaw detection. The longitudinal wall thickness of two cylinders should not exceed two. The butt weld of thick wall continuous pipe shall be flush with the. When the nominal diameter is larger than, back sealing welding shall be carried out in the pipe. In the process of pipe rolling, Q345B rolling Q235B rolling, large diameter thin wall rolling, large diameter thick wall rolling, stainless steel rolling, L360 rolling and 16Mn rolling were analyzed. The offer is in progress. Welcome new and old customers to consult. Prevent surface damage of steel plate.