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A technology of straight seam submerged arc and manufacturing methods, applied in the direction of manufacturing tools, arc welding equipment, welding media, etc., to achieve the effects of reducing heat input, improving performance, and easy processing
Active Publication Date: 2008-06-25
BC P INC CHINA NAT PETROLEUM CORP +2
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Problems solved by technology
At present, some foreign enterprises claim to have been able to produce X100 steel pipes by UOE forming met
Method used
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Embodiment 1
[0024] The manufacturing method of the present embodiment comprises the following steps:
[0025] 1. The chemical composition is C 0.06%, Si 0.30%, Mn 2.0%, P≤0.005, S≤0.0003, V+Nb+Ti 0.06%, Ni+Cr+Cu 0.6%, Cr+Mo+Mn 2% 14.3mm thick X100 controlled rolling steel plate.
[0026] 2. For edge milling, the bevel size is , the angle is 40°, the blunt edge is 4mm, and the bevel depth is 6mm.
[0027] 3. Pre-bend the edge, use the pre-bending machine to pre-bend the edge of the plate, so that the curvature of the edge of the plate meets the requirements.
[0028] 4. JCO forming. On the JCO forming machine, one side of the steel plate after pre-bending is firstly stamped 9 times, and the steel plate on this side is pressed into a semicircle, that is, the entire steel plate becomes a J shape, and then the other side of the steel plate is pressed into a semicircle. Half of it is bent by the same method and pass, and the steel plate is C-shaped at this time, and then the middle part of t...
Embodiment 2
[0049] The difference between this embodiment and embodiment 1 is:
[0050] The stamping frequency in step 4 adopts 21 stampings, that is, half of the steel plate is stamped 10 times respectively, and then a stamping is performed in the middle of the steel plate to make the steel plate into an open O-shaped;
[0051] The four-wire submerged arc automatic welding process in step 6 is: the current of the first wire is 800A, and the voltage is 32V; the current of the second wire is 650A, and the voltage is 36V; the current of the third wire is 500A, and the voltage is 38V; The current is 450A, the voltage is 40V; the welding wire spacing is 18mm, and the welding speed is 170mm / min.
[0052] The four-wire submerged arc automatic welding process in step 7 is as follows: the current of the first wire is 900A, and the voltage is 32V; the current of the second wire is 700A, and the voltage is 36V; the current of the third wire is 500A, and the voltage is 40V; The current is 450A, the...
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Abstract
The invention discloses a method for manufacturing an X100 pipeline steel longitudinal submerged arc welded pipe which is a longitudinal submerged arc welded pipe for transporting oil and gas. The method comprises using an X100 controlled rolled steel plate, the chemical compositions by percentage are: 0.02 to 0.08 percent of C, 0.10 to 0.30 percent of Si, 1.60 to 2.10 percent of Mn, less than or equal to 0.02 percent of, less than or equal to 0.005 percent of S, 0.06 to 0.1 percent of V+Nb+Ti, 0.6 to 1.0 percent of Ni+Cr+Cu, 2 to 2.6 percent of Cr+Mo+Mn. The manufacturing process of the pipe includes: baiting, edge milling of the steel plate, prebending, molding, prewelding, internal welding, external welding, expanding, and chamfering, wherein the molding process is punching the steel plate by a JCO molding machine and bend the steel plate into a J-shape, a C-shape and an open O-shape in turn; the internal welding and the external welding are welding the internal side and the external side of the pipe by four-wire submerged arc welding. The method of the invention can mold the steel plate into a pipe much more approximate to a round shape, realizes high-speed welding and improves working efficiency, with the welding process ensuring the internal quality and external quality of the steel plate.
Description
technical field [0001] The invention relates to a manufacturing technology of a straight seam submerged arc welded pipe, in particular to a manufacturing method for forming and welding a pipeline for transporting oil and gas made of X100 steel. Background technique [0002] Pipeline transportation is the most reasonable transportation method for long-distance transportation of oil and gas. The development trend of pipeline construction is to develop in the direction of long distance, high pressure and large diameter. Therefore, the strength requirements of the pipeline are getting higher and higher; in addition, because the oil and gas transmission pipelines are often thousands of kilometers long, the geological conditions along the way are complex, and the climate is changeable, so the toughness of the pipelines also has very high requirements. At present, the material of foreign transmission pipelines generally adopts X70 steel grade pipeline ste...
Claims
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Application Information
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