Q355b large diameter welded pipeThere is no new story of weakening price shocks

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, 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.

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.

.This is an indirect measurement, which measures the distance between the two ends of the steel pipe and their respective reference points, and indirectly measures the length of large continuous pipe. Long term hot rolled steel pipe, thick wall straight seam rolling pipe, steel casing, rolling pipe factory has no turnover to avoid price difference, and the price is 20% higher than the market price! The price of more than one ton is higher! A length measuring trolley is set at both ends of the steel pipe, with the initial position of zero and the spacing of L, and then the edited length is moved to the walking distance of each steel pipe end (L, l-l2-l are the length of the steel pipe).

1 carbon structural steel: q215-a, q215-a. & middot; F,Q215-B,Q215-B· FQ235-A,Q235-A· F,Q235-B,Q235-B· F. Q235-c ordinary carbon steel: B2 BY2 B2F by2f B3 by3 B3F by3f a2ay2 a2f ay2f A3 ay3 A3F ay3f2 high quality carbon steel: 10 15 20 transmission shaft steel 3 low alloy structural steel: 123mn 16Mn 19mn 08ti 10ti15ti4 special purpose steel plates are stacked in the open air to prevent rain from causing steel plates. The oxide scale falling off the surface of steel plates is easy to turn into blocks or clusters and adhere to steel plates or crimping rollers, When repeatedly pressed, the coiled pipe forms pit defects.

.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, welded, formed, 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, 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, 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, urban water supply,45# large diameter thick wall coiled pipe, heating, gas supply and other projects.

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, because it goes without saying that double-sided welding is necessary here.

When the pipe is rolled, the distance between the two welds shall be greater than 100mm, and the distance between the outer wall of the outer branch pipe shall not be less than 50mm.

Thick wall coil production process thick wall coil production process can be divided into cold drawing, cold rolling, hot rolling and hot expansion.

The influence of welding process parameters on welding current mainly includes two aspects: according to the production characteristics of spiral steel pipe, small welding current is usually used for internal welding

original.In short, the use standard of coiled steel pipe is very important, and the above points can be reasonably explained. For the information of our rolled steel pipe, let's simply say so much today. If you need it, you can directly consult our manufacturer.

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, welded, formed, 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, etc. the products are widely used in petroleum, chemical industry, natural gas transmission, pile driving, urban water supply, heating, gas supply and other projects.

During pipe rolling, 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.

During the plate crimping process, the steel plate can be sandblasted to eliminate the iron oxide scale on the surface of the steel plate and ensure the raw materials on the cylinder surface during the processing process.

Inspection items.The main materials are q23q3420, 435cimo and 42cimo, 16 manganese and 16 manganese capacity. Generally, cold rolled sheet can be used for pipe rolling, and the product standards are GB / t50205-200, GB / t3092-2001,Q235B welded steel pipe, etc. Continuous pipe is widely used in petroleum, natural gas transmission, pile driving, urban water supply, heat supply, gas supply and other projects.

Thick wall coiled pipe is not only used to transport fluid and powdery solids, exchange heat energy, mechanical parts and containers, 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,Q345B large diameter thick wall welded pipe, 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, etc.

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, it is necessary to preheat the weldment before welding.

.Steel plate materials mainly include Q235, Q345, 20, with 16 manganese and 16 manganese capacity. Generally, cold rolled plate can be used for pipe winding. Like oil, chemicals, natural gas transportation, piling and urban water supply, heating, 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.

If the particle size of straight seam coiled pipe is too small, the adhesion and impact strength of the coating will be reduced. For serious internal pitting corrosion, it can not only rely on the high-strength impact of large particles of rinse agent, but also remove corrosion products with small particles. Reasonable ratio design can not only slow down the speed of pipeline and nozzle (propeller) rinse agent. Wear and tear, and the rate of rinsing agent can be greatly improved. Generally, the particle size of metal particles is 2 - 9mm, and the particle size of metal sand is 1 - 2mm, of which 3 - 5mm is a common component. The sand shot ratio is usually 4 to 9.

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.