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, etc. Continuous pipe is widely used in petroleum, natural gas transmission, pile driving, urban water supply, heat supply, gas supply and other projects.
Flame cutting and plasma cutting are commonly used for sheet metal blanking in our factory. The equipment used includes manual cutting copier, 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.
.The common standards for thick wall coiled pipes are generally divided into: (ministerial standard, also known as spiral submerged arc welded steel pipe for ordinary fluid transmission pipeline), (national standard, also known as oil and gas industry transmission steel pipe (up to now, the requirements are strict (American Petroleum Association, also known as pipeline steel pipe; which is divided into two levels PSL1 and PSL2), (spiral welded steel pipe for pile) The Ministry of petroleum has set up standard Pandu pipe, oil and gas industrial transmission steel pipe, spiral seam high-frequency welded steel pipe for general low-pressure fluid transmission. The hot-rolled steel strip coil is used as the pipe blank, and the spiral seam high-frequency welded steel pipe for high-frequency lap low-pressure fluid transmission is used. The spiral welded steel pipe for pile is hot-rolled steel strip coil as the pipe blank, which is often warm spiral formed, and double-sided submerged arc welding is used Connecting or high-frequency welding of steel pipes for building structures, docks, bridges and other foundation piles. Q235B steel pipes bring great convenience to our life. For example, we use water or water in our daily life. If supported, these things will not be easily used. Although the pipeline system is used in the transportation industry, rolling pipe, Q235B rolling pipe, large-diameter thin-wall rolling pipe and large-diameter thin-wall rolling pipe Large diameter thick wall coil, stainless steel coil, L360 coil and 16Mn coil have high pressure resistance, good waterproof performance, fire and high temperature resistance, strong overload capacity, corrosion resistance, radiation protection and long service life, which has brought great support.
Generally, the wall thickness of the rolled pipe is 20mm and the outer diameter is 450-3000mm. It is rolled, welded, formed, butted and rolled directly from the steel plate. It has the advantages of short processing time, fast delivery and low cost. The rolled pipe is mainly used for hot-rolled thick wall coils such as pipes, billboard and columns. The thickness of the hot-rolled thick wall coil is generally greater than 20mm and the outer diameter is 450-3000mm. The hot-rolled thick wall coil is rolled under the heating of the steel plate Welding, forming, deburring, defect detection and delivery. Sometimes the wall thickness is relatively thick and secondary heating is required. The feature is that the outer diameter tolerance is small Uniform wall thickness. It is important that the hot rolled thick wall coil will not damage the properties of raw materials. The disadvantages of hot roll thick wall rolling pipe are long processing time and. Hot rolled thick wall coils are widely used: cylinder, hydraulic, bridge, roller table, etc.
.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, GB / t3092-2001, etc. The products are widely used in petroleum, chemicals, pile driving, urban water supply heating, gas supply and other projects.
Pipe groove processing and joint pair: when the pipe wall thickness is less than 6mm, it is type I weld; when the pipe wall thickness is greater than 6mm, it is type V weld; For pipes with diameter greater than 600mm and wall thickness greater than 6mm, the bottom of the pipe shall be sealed at the bottom of the pipe; In addition to the lap joint, the other type of gas coil pipe is continuous and solid V-groove butt welding. If the weld is found to be defective, the weld must be re welded. Rewelding shall not be more than twice. The longitudinal weld of coiled pipe in the same cylindrical part shall not be greater than, and the spacing between two longitudinal joints shall not be less than 200mm.
The steel plate coil adopts the secondary forming process. When rolling, first bend both ends of the steel plate, and the diameter shall be less than the diameter of the coiled pipe. Then adjust the bed pressure, rolling two to three times steel pipe coiled pipe welding and strengthening the rolling pipe joint, long-term rolling pipe, Q235B coil pipe, Q345B coil pipe, large diameter thin wall tube, large diameter heavy wall coil pipe, stainless steel coil pipe, L360 coil pipe, 16MN coil pipe and other brand products, designated products are complete quality assurance. Then transported to the welding platform for welding.
First, select the specification and put forward the pipe, such as 90 & deg; Elbow, which can calculate the curvature to calculate the 90 DEG of the long material; Elbow, and then cut with the length as the fixed length.
In the cleaning and preheating process of thick wall coiled pipe firstly, before spraying (throwing) treatment, clean the surface of thick wall coiled pipe to remove grease and scale, and preheat the pipe body with heating furnace to keep the surface of thick wall coiled pipe dry. During the spraying (throwing) treatment, because the surface of the thick wall coil does not contain grease and other dirt, the derusting effect can be enhanced. The dry surface of the thick wall coil is also conducive to the separation of steel shot, steel sand and rust and oxide scale, so as to make the surface of the thick wall coil more clean after derusting.
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, hydraulic, bridge roller, etc.
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.
How many?.The misalignment of butt weld of coiled pipe shall not exceed 20% of wall thickness and shall not exceed 2mm. Butt joint of two pipes with small adjacent deviation value.
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).
Thick wall coiled pipe is made of steel plate. Thick wall coiled pipe can be divided into coiled pipe and thick wall coiled pipe. The wall thickness of coiled pipe is 20mm and the outer diameter is 450-3000mm. It is rolled, welded, formed, butted, removed and reinforced directly from the steel plate. Coil pipe processing time is short and delivery is fast Low cost. The rolling pipe is mainly used for pipes, billboards, columns etc.
.Service specification of coiled steel pipe: there are spiral welded pipe and seamless pipe, and the pressure resistance of gas and water is different.
Hot melt installation: pipes are connected according to the nature of thermoplastic coiled pipes. During hot melt, special heating equipment (generally electric heating type) is used to make the connecting surface of coiled pipes of the same material and pipe fittings reach the molten state, and they are pressed together manually or mechanically. This method is closely combined, safe and durable, and avoids water running, emitting, dripping and leakage at the joint of metal pipe fittings.
Effective.