Double-seam submerged-arc welding pipe with petroleum and natural-gas transfer and its production

Abstract

Oil and natural gas are delivered by the double-slit sew pipe and method of production. Characteristic is: Adopt two pieces of steel plate whose width as steel pipe the girth 1 / 2 , make use of two-sided arc weld to put together two pieces of steel plate following lengthways, then take common used method to product steel pipe . Another method is to make two pieces of steel plates carry on C's model respectively. The two C-shaped are weld to a group of O-pipe, after expanding, nondestructive testing, the product is completed. Effect: Reduce the steel pipe's manufacturing difficulty; make use of existing LSAW pipe equipment, use of existing LSAW pipe equipment, produce outside path at 1016 mms above, wall thickness at 21 mm above the high-quality steel pipe.

Description

technical field

[0001] The invention belongs to the technical field of metal materials, and relates to a large-diameter pipeline used for oil and natural gas transportation and a production method, in particular to a double-seam submerged arc welded pipe and a production method thereof. Background technique

[0002] How much diameter and thickness of steel pipe should be used for China-Russia, Central Asia and other natural gas pipelines with an annual output of more than 30 billion cubic meters has become a hot topic among pipeline experts. A difficult problem restricting the construction of natural gas pipelines is the production of large-diameter, thick-walled steel pipes. my country's ability to produce wide and thick steel pipes and large-diameter thick-walled steel pipes is insufficient, and steel pipes with larger outer diameters and larger wall thicknesses cannot be produced.

[0003] my country has built a number of large outer diameter longitudinal submerged arc w...

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