Q355b thick wa
Q355b welded sAfter pushing, the elbows should be formed in this hot state, because some elbows will be distorted after improper handling, which is not allowed. In addition, after pushing the head, the outer diameter of the front end is usually large and formed by the forming die. The forming die is actually a press. It must have a set of molds, two semi arcs, one on each side. The outer diameter after forming reaches the size of the finished product.
The thickness of hot-rolled thick wall coil is generally greater than 20mm, 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.
.During handling, the damaged parts shall be protected. Raw materials include steel strip coil, thick wall large diameter steel plate coil, welding wire and flux. Strict physical and chemical inspection shall be carried out before input.
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 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.
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,20# reel, large-diameter thin-wall pipe rolling, large-diameter thick wall pipe rolling, stainless steel pipe rolling,Q460b straight seam welded pipe, L360 pipe rolling and 16Mn pipe rolling, the quality is excellent and the price is favorable. The distance between the two longitudinal welds should not be less than 200.
After pushing, the elbows should be formed in this hot state, because some elbows will be distorted after improper handling, which is not allowed. In addition, after pushing the head the outer diameter of the front end is usually large and formed by the forming die. The forming die is actually a press. It must have a set of molds, two semi arcs, one on each side. The outer diameter after forming reaches the size of the finished product.
Round welded pipe joints shall be circular. The arc length of the coil calibration circle shall be 1 / 6 to 1 / of the circumference of the pipe, and the gap between the sample and the pipe shall comply with
Large diameter thick wall coiled pipe is usually higher than dn450. Large diameter thick wall coiled pipe sometimes has two welds. The reason why this happens is mainly because of raw material problems and equipment processing. Steel mills usually do not produce steel plates with the required width of large-diameter welded pipes required by customers. Therefore, two plates need to be welded, so welds will occur. Large diameter thick wall coiled pipe can mainly carry out flaw detection and the requirements related to delivery are wider than other products. Ultrasonic flaw detector is mainly used to detect large-diameter thick wall coiled pipe. The same circular joint of coiled pipe shall not be greater than 2.
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.
total cost.Deviation reel as follows (unit: mm): nominal diameter & amp; amp; lt; 800 800 to 1200 1300 to 1600 1700 to 2400 2600 to 3000 perimeter Deviation & plusmn; 5± 7± 9± 11± The ovality is 1% of the outer diameter, and the quality of no more than 4 steel plate coils is greatly affected by the weld size mainly including the comprehensive factors such as welding process parameters, welding wire shape and position parameters, flux flow, flux process performance and formed joint.
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
The weld reinforcement is increased, the weld formation is deteriorated and the edge transition is poor.
The distance between the two longitudinal slits of the reel assembly shall be greater than 100mm. The distance between the outer wall of the branch pipe and the weld shall not be less than 50mm.
Create brilliance.The wall thickness of coiled pipe like coiled pipe is under 20mm and the outer diameter is 450-3000mm. It is made of steel plate by direct rolling, welding, forming, butt joint and rebar removal. Coil pipe has the characteristics of short processing time, rapid delivery and low cost. The rolling pipe is mainly used for pipes, billboards, columns, etc.
Accurate measurement of steel plate curl length according to the different process requirements of various pipe rolling manufacturers, the steel pipe length measurement system has a variety of length measurements. There are mainly the following: the basic principle of grating ruler length measurement is: two grating rulers with fixed length are set outside both ends of high-frequency welded coil pipe and the rodless cylinder drives the grating ruler close to both ends of the steel pipe to realize the measurement of the length of the steel pipe due to the interference of light.
Welding voltage because the welding arc is conical, and the welding voltage directly affects the length of the arc. Therefore,Q355b large diameter welded pipe, the general production process of thick wall continuous pipe can be divided into cold drawing and hot rolling. The production process of cold rolled seamless steel pipe is generally more complex than that of hot rolled steel pipe. First, the pipe must be subject to winding diameter test. If there is no response crack on the surface, the round pipe will be cut and the growth of the blank is about M. However, during annealing, acid should be used for annealing, and attention should be paid to whether there are a large number of bubbles on the surface. If a large number of bubbles appear, the quality of the steel pipe will not meet the response standard. The appearance of cold-rolled seamless steel pipe is shorter than that of hot-rolled seamless steel pipe, and the wall thickness is generally smaller than that of hot-rolled seamless steel pipe, but the surface is brighter than that of thick wall seamless steel pipe, the surface is not too rough the diameter is not too prickly, operates in good faith, and has a real price. The same specification, spot supply, and complete specifications,. With the increase of welding voltage, the arc length increases, the moving range of solder joint increases and the molten pool widens. If welding is carried out in a horizontal position, the weld width will be changed but the edge transition of the weld will not be affected. However, the external welding of spiral welded pipe is carried out on the slope, large-diameter thick wall continuous pipe, thick wall straight seam continuous pipe, steel casing and quality assurance of pipe rolling plant. During the preferential activities, the greater the welding voltage, the wider the weld pool, the more serious the transverse flow of weld metal, and finally lead to the bias of weld metal.
.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 inner diameter of 1800mm steel plate coiled pipe elbow is 1800mm, the bending radius is also 1800mm, the material thickness is 4mm, and the bending is 90 & deg;.
The latter stage is called unloading regression. At this time, the sector continues to retract from the circumferential position of the rewind pipe before rewinding, and will eventually reach the initial expanding position, which is the small shrinking diameter of the sector required by the expanding process. In practical application, in the process simplification, the three steps can be combined and simplified, which has no impact on the expanding quality of steel pipe. How to calculate the weight per meter of steel coil? Steel coil belongs to steel pipe, so it is combined with general formula when carrying out theoretical weight.