Hot rolled steel pipe is a kind of thick wall steel pipe rolled under the condition of heating the steel plate.
Clean the iron oxide scale falling off in the process of plate drum to prevent the iron oxide scale from bonding and the surface of steel plate.
.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, 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.
Application of hot rolled steel pipe: the disadvantage of changing hot rolled steel pipe into seamless steel pipe with fixed specification and model is another major feature of hot rolled steel pipe. In the production process, hot rolled steel pipe has been widely used, especially in large equipment such as oil cylinder production, bridge construction, engineering column, large drum and so on. Save materials and labor for the above enterprises, reduce production costs, improve the market competitiveness of finished products, and promote the development of enterprises to a certain extent. Continuous pipe is committed to producing all kinds of circumferential seam, and is reformed on the basis of the same specification and model of traditional pipe rolling equipment. 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 8-100mm.
.It is important that the thick wall coiled pipe will not damage the performance of raw materials. The disadvantage of hot roll thick wall rolling pipe is that the treatment time is long Very expensive. Thick wall rolling pipe is widely used: cylinder, hydraulic, bridge, roller, etc.
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.
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, 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, GB / t3092-2001, etc. the products are widely used in petroleum chemical industry, natural gas transmission, pile driving, urban water supply, heating, gas supply and other projects.
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.
, large-diameter thick wall coils are factory painted with marks, and large-diameter thick wall coils are in stock. According to this, the process parameters are adjusted at any time to eliminate defects in time.
In progress, etc.
Statistics.The pipe volume is huge, the production site environment is complex and the measurement cannot pass through the lower support bench of the steel pipe. This operation is convenient and the measurement accuracy is within & plusmn; Within 10mm, repetition accuracy ≤ 5mm. Thick wall coiled pipe is made of steel plate. Thick wall coiled pipe can be divided into coiled pipe and hot-rolled thick wall coiled pipe.
Gas and other projects.
For external welding, a larger welding current is used. However, under the condition of high welding current, the stirring effect of molten pool is enhanced, and the melting amount of welding wire increases accordingly, resulting in the increase of weld reinforcement, and the gap between the sample and the pipe shall comply with
index.What is the manganese content of straight seam coiled pipe? The material of straight seam coiled pipe and an appropriate amount of manganese 1 can significantly improve the cold brittleness of straight seam steel pipe steel, increase the yield strength and tensile strength, reduce the plasticity and impact toughness, much higher than the general processing temperature of steel), which is at high temperature in steel, so it can reduce the harmful effect of sulfur and lead to hot processing of steel. Sulfur cracked & ldquo; Hot crisp & rdquo; The phenomenon has decreased.
Steel plate rolling round production process: the production process of steel plate rolling round generally includes hot rolling hot coil, casting and other production methods! Steel plate rolling is often seen in the production process of double-sided submerged arc welding. The products go through multiple processes such as welding, straightening and flat head. 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 are advanced in technology, strict in testing, more affordable and more preferential. Welcome to consult
Because the coiled steel pipe plays an important role in construction, railway construction and bridge construction, its quality standards are also more important. If you don't understand the quality specifications and standards, it is easy to have an impact. Generally, we can purchase from these aspects.
.Gas and other projects.
Pipe rolling is to form the steel pipe blank with a steel plate rolling machine, then weld it into steel pipe with submerged arc welding or electric welding, unstable pipe quality and low dimensional accuracy, but the equipment is simple and the investment is less. Longitudinal welded pipe equipment has high efficiency, good quality, high precision and good performance. It is the main equipment for large-scale production of steel pipes.
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.