A method of manufacturing x100 high steel grade large diameter thick wall longitudinal submerged arc welded pipe

A technology of straight seam submerged arc welding and manufacturing method, used in manufacturing tools, arc welding equipment, welding equipment, etc., can solve the problems of strength and toughness matching of welded joints, uneven forming, and decline in mechanical properties of pipe bodies, and achieve guaranteed strength. and toughness, uniform performance, and avoid the effect of serious decline in tube performance

Active Publication Date: 2015-09-16
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art, to provide a method for manufacturing X100 high steel grade large-diameter thick-walled longitudinal submerged arc welded pipes, and to solve the problems caused by uneven forming of thick-walled longitudinally welded pipes during the forming process. The problem of serious decline in physical mechanical properties and the matching of strength and toughness of welded joints provide a reference for the industrial application of X100 high-strength line pipe in my country

Method used

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  • A method of manufacturing x100 high steel grade large diameter thick wall longitudinal submerged arc welded pipe
  • A method of manufacturing x100 high steel grade large diameter thick wall longitudinal submerged arc welded pipe
  • A method of manufacturing x100 high steel grade large diameter thick wall longitudinal submerged arc welded pipe

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Embodiment

[0027] Example: Manufacture of X100Φ1219×20.6mm straight seam welded pipe

[0028] (1) The raw material is an X100 steel plate with a wall thickness of 20.6mm, and its main alloy element content: C0.06%, Si0.27%,

[0029] Mn1.75%, S0.002%, P0.01%, Ni0.26%, Cr0.02%, Cu0.21%, Nb0.06%, V0.003%, Ti0.01%, Mo0.20%, Al0.05%, N0.008%, B0.0001%, the balance is Fe, of which CE (Pcm) is 0.19.

[0030] (2) Ultrasonic inspection of steel plates, 100% ultrasonic testing of steel plates.

[0031] (3) Edge milling, the groove size is 37.5° for the upward groove, 40° for the downward groove, the depth of the downward groove is 8.0mm, and the blunt edge is 7.0mm.

[0032] (4) Pre-bending, 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.

[0033] (5) JCO forming, first press one side of the pre-bent steel plate 10 times on the forming machine, each time the feed rate is 165.4mm, press it into a "J" shape, an...

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Abstract

The invention discloses a manufacturing method of an X100 high-steel-grade large-opening-diameter thick-wall longitudinal submerged-arc welded pipe. The manufacturing method comprises steel plate ultrasonic inspection, edge milling, edge pre-bending, JCO forming, pre-welding, inner welding, outer welding, welding line X-ray inspection, steel pipe diameter expanding, hydrostatic pressure testing, welding line ultrasonic inspection, pipe end X-ray inspection, chamfering, pipe end magnetic particle testing, and appearance quality inspection. A refined welding process comprises inner and outer welding four-wire submerged-arc automatic welding. The X100 high-steel-grade large-opening-diameter thick-wall longitudinal submerged-arc welded pipe manufactured by the method not only has the characteristics of high low-temperature impact toughness, good welding joint mechanical properties and the like, but also has relatively high pipe body uniform elongation rate.

Description

Technical field: [0001] The invention belongs to the field of petroleum pipes, and relates to a method for manufacturing a welded pipe, in particular to a method for manufacturing an X100 high steel grade large-diameter thick-walled straight seam submerged arc welded pipe. Background technique: [0002] Petroleum and natural gas are the blood of industry and the foundation to support national economic and social development. They are important strategic resources, accounting for 24% of my country's primary energy. Pipeline transportation is the most economical, safe and reasonable transportation method for long-distance transportation of oil and gas, and has become the main way of land oil and gas transportation. With the needs of pipeline construction and the continuous advancement of technology, pipeline construction is developing in the direction of high pressure and large diameter. [0003] As a typical representative of high-strength pipeline steel, X100 has a very bro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C37/08B23K9/16B23K9/18C22C38/58
Inventor 毕宗岳刘斌牛辉张锦刚刘海璋陈长青包志刚张万鹏赵红波黄晓辉牛爱军张君杨军杨耀彬刘刚伟
Owner BC P INC CHINA NAT PETROLEUM CORP
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