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.
Profiled seamless steel pipe is the general name of API seamless steel pipe with other section shapes except circular pipe. According to the shape and size of steel pipe cross section, it can be divided into profiled seamless steel pipe with equal wall thickness (code D), profiled seamless steel pipe with unequal wall thickness (code BD) and profiled seamless steel pipe with variable diameter (code) Special shaped seamless steel pipe is widely used in various structural parts, tools and mechanical parts. Compared with circular pipe, special-shaped pipe has large moment of inertia and section modulus, and has large bending and torsion resistance, 20#, 35#, large-diameter thick wall rolling pipe, thick wall straight seam rolling pipe, steel casing, rolling pipe factory and other related businesses. Merchants who hope to have this business please. The steel plate with the required width of welded pipe required by customers is generally not produced by the steel factory, 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, 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, metric welded 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, and the electrical model is
The butt joint of coiled pipe (with the same wall thickness) shall not exceed 10% of the wall thickness and not more than 2mm.
.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.
The offer is in progress. Welcome new and old customers to consult. Prevent surface damage of steel plate. Thick wall coil and large diameter coil are mainly made of carbon steel, 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.
Continuous pipe products are widely used in petroleum, chemical industry, natural gas transmission, 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 weld of the same barrel section of thick wall continuous pipe shall not exceed two passes. 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, the rolling quality of pipe, Q235B rolling, Q345B rolling, large diameter thin wall rolling, large diameter thick wall rolling, stainless steel rolling L360 rolling and 16Mn rolling were analyzed. Professional hot rolled steel pipe, large diameter thick wall rolling pipe thick wall straight seam rolling pipe, steel casing, rolling pipe factory, large quantity, fire resistance - Waterproof - high temperature resistance, strong and durable, safe and reliable
Main technical measures for low hardening trend
The straightening of thick wall coil pipe is to enter the inlet roller table of the straightener from the upstream roller table. When the head of thick wall coiled pipe is sensed by the middle position sensing element of the inlet roller table, the roller table decelerates; When the head of the thick wall coiled pipe is sensed by the position sensing element at the end of the inlet roller table, the inlet roller table section falls and the closing delay of the inlet quick opening cylinder starts timing; When the pipe head enters the middle position of the inlet straightening roll, the inlet quick opening cylinder is closed, the thick wall coil is bitten in, the professional hot-rolled steel pipe, large-diameter thick wall coil, thick wall straight seam coil, steel casing, the performance of the coil factory is stable, safe, and the technical level has reached the domestic level and the advanced level of similar products in the world. At the same time, the roller table at the inlet section falls. The second is the setting of quick opening cylinder delay. When the pipe head enters the middle position between the intermediate roll and the outlet roll, the quick opening cylinders of the intermediate roll and the outlet roll are closed one after another, and the rolling pipe, Q235B rolling pipe, Q345B rolling pipe, large-diameter thin-wall rolling pipe, large-diameter thick wall rolling pipe, stainless steel rolling pipe, L360 rolling pipe and 16Mn rolling pipe ensure the quality. Your satisfaction is our pursuit! Welcome to inquire. Thick wall coil enters the straightening process.
The thickness of hot-rolled thick wall coil is generally greater than 20mm, and the outer diameter range is 450-3000mm. The hot-rolled thick wall coil is rolled, welded, formed, ribbed and defect detection under the condition of steel plate heating. Sometimes the wall thickness is relatively thick and secondary heating is required. It is characterized by small outer diameter tolerance and uniform wall thickness. It is important that the hot rolled thick wall coil will not damage the properties of raw materials. The disadvantage of hot roll thick wall rolling pipe is that the treatment time is long. Hot rolled thick wall coiled pipe is widely used: cylinder, hydraulic, bridge, roller, etc.
Work courses.Thickness detection thickness detection is very simple, as long as the caliper is OK. Like other pipes.
The diameter of thick wall coiled pipe is usually higher than dn450. Thick wall coiled pipe is sometimes two welds. The reason why this happens is mainly due to the problems of raw materials and equipment processing. 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.
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.
This measurement method overcomes the problem of steel
wholesaler.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.
During cold sizing, not only deformation but also a small amount of plastic deformation occurs at the end of thick wall coiled pipe. After sizing, there may be differences in the transition zone between expanding and non expanding. At the same time, there may also be internal and external surface scratches caused by punch and sizing ring resulting in slight stress corrosion. Therefore, the dimensional accuracy of hot-rolled steel pipe should be improved as much as possible to avoid adopting method.
Finish machining is performed below, and after shot peening, the scales on the inner and outer surfaces of the elbow are removed, chemical industry natural gas transmission, 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, the rolling quality of pipe, 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.
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.
In order to make you better understand the installation method of coiled pipe, the following coiled pipe factory will introduce the installation method of coiled pipe: pipe hoop is used, and raw silk belt, white hemp wire, pipe expander, handle and other tools are used to connect coiled pipe and pipe fittings. This method may need repeated debugging due to the great influence of human factors. In addition, when the materials of coiled pipes and pipe fittings are different, due to their different thermal coefficients, leakage may occur when cold and hot water are used alternately.?