Q345B large diameter thick wall coiled pipeGrasp the cause of wear and easily repair

announcer:hp709HP180518493 release time:2022-03-18 15:24:38

we should prevent the surface damage of the plate. The parts with serious scars must be grinded to make transition

After, and the wall thickness of the grinded part shall not be less than the design wall thickness. Steel rolling pipe is an unconventional pipe, and there is no domestic standard at present. Therefore, the inspection is mainly aimed at the thickness and weld quality.

Gas and other projects.

.It is characterized by high precision. However, the grating ruler is expensive and difficult to maintain, which has a great impact on dust and field vibration.

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, 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.

.Extend the length of the part: 566, divide it into 24 equal parts, symmetrical, 50 44 40 39 2.

Flame cutting and plasma cutting are commonly used for sheet metal blanking in our factory. The equipment used includes manual cutting, copier,Q460b thick wall coiled pipe, semi-automatic cutting machine and NC cutting machine. Manual blanking is arbitrarily large compared to other cuts Flexible and convenient, no special supporting cutting equipment is required.

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, 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.


Q345B large diameter thick wall coiled pipeGrasp the cause of wear and easily repair



The longitudinal weld of the same barrel part of the coiled pipe shall not be greater than 2.

Because of its good mechanical properties, it has been widely used in steel pipe production. According to the different process requirements of steel rolling manufacturers, the steel pipe length measurement system has a variety of length measurement methods. The main points are as follows: the basic principle of grating ruler length measurement is: two fixed length grating rulers are set outside both ends of high-frequency welded continuous pipe, and the rodless oil cylinder drives the grating ruler close to both ends of the steel pipe to realize the interference measurement of the length of the steel pipe.

When the nominal diameter is greater than or equal to 600mm, back welding shall be carried out in the pipe.

Respect for customers.Extend the length of the part: 566, divide it into 24 equal parts, symmetrical and the length of each bisector from the middle to the side is: 11 110 106 10 93 84 75 66 57 0, 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.

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.


Q345B large diameter thick wall coiled pipeGrasp the cause of wear and easily repair



The steel plate or strip is bent and then welded to form a thick wall coil. According to the welding form, it is divided into straight seam welded pipe and spiral welded pipe. It is divided into ordinary welded pipe, galvanized welded pipe, oxygen blowing welded pipe, wire sleeve, metric welded pipe, rolling pipe, deep well pump pipe, automobile pipe, transformer pipe, welded thin-wall pipe, welded pipe and spiral welded pipe. Coil pipe is dedicated to the production of, longitudinal ring coil pipe and steel pressure pipe, and is modified according to similar specifications of traditional rolling equipment. The function of increasing the parameters of spiral steel pipe equipment by 30% fills the gap that the original traditional rolling equipment can not produce. It can produce steel pipes with a diameter of 400 or more and a wall thickness of 8-100mm. The material mainly includes q23 q34 20#, 16 manganese, 16 manganese capacity, etc. Product executive standards include: GB / t50205-2001,Q345B large diameter thick wall welded pipe, GB / t3092-2001, etc. The products are widely used in petroleum, chemicals natural gas transportation, pile driving, urban water supply, heating, and then transport it to the welding platform for welding.

In recent days, large-diameter steel plate rolling pipe manufacturers continue to operate with small fluctuations. Among them, the market high line and the pile casing lattice for threaded bridge piling in Taiyuan market increased significantly by 70 yuan / ton. On March 25 in Northeast China, Shenyang market rose slightly by 30 yuan / ton,Q345B welded steel pipe, and the overall situation remained low inventory, low transaction and high. The diameter of spiral steel pipe produced by our factory can be from 219mm to 0mm, and the wall thickness can be from 4mm to 30mm. Main purpose: it is widely used in civil engineering construction such as houses, bridges and roads. The spiral welded steel pipe is rising significantly today. The raw material billet for the production of spiral steel pipe is carbon structural steel or low alloy structural steel after sedation treatment. It has been well used in the chemical industry and agricultural irrigation, and has provided good resources for the transportation and construction industries. According to its own structural characteristics, it has two main uses. It is used for transportation, such as water supply and drainage. Based on its superior performance, it can also be used for the transportation of gas, petroleum and other chemical substances. It is used for structure, such as pile driving pipe and bridge, as well as pipe for road, wharf and building structure.

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.

.Service specification of coiled steel pipe: there are spiral welded pipe and seamless pipe, and the pressure resistance of gas and water is different.

The distance between the longitudinal joints of two pipes shall be greater than 100 mm. The distance between the outer wall of the branch pipe and the weld shall not be less than 50mm.

The butt joint of coiled pipe (with the same wall thickness) shall not exceed 10% of the wall thickness and not more than 2mm.