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Method for manufacturing X 90 grade pipeline steel large-diameter thick-wall spiral submerged-arc welding pipe

A technology of submerged arc welded pipe and manufacturing method, which is applied in the field of welded pipe manufacturing, can solve the problems of large geometric size change of the pipe body, high residual stress of welded pipe, unstable forming, etc., and achieve reduced heat-affected zone, excellent weld shape, The effect of improving molding accuracy and stability

Inactive Publication Date: 2017-03-29
BAOJI PETROLEUM STEEL PIPE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a method for manufacturing X90 grade large-diameter spiral submerged arc welded pipe with low stress and excellent girth weld performance. The instability of forming leads to technical problems of high residual stress of welded pipes and large changes in pipe geometry

Method used

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  • Method for manufacturing X 90 grade pipeline steel large-diameter thick-wall spiral submerged-arc welding pipe
  • Method for manufacturing X 90 grade pipeline steel large-diameter thick-wall spiral submerged-arc welding pipe
  • Method for manufacturing X 90 grade pipeline steel large-diameter thick-wall spiral submerged-arc welding pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Manufacture of X90 grade Φ1219×16.3mm spiral submerged arc welded pipe.

[0027] 1. Use X90 coil with a wall thickness of 16.3mm, and its main alloy element content: C 0.06%, Si 0.28%, Mn1.92%, S 0.001%, P 0.006%, Ni 0.2%, Cr 0.26%, Cu 0.16 %, Nb 0.07%, V 0.02%, Ti0.016%, Mo 0.24%, Al 0.02%, N 0.005%, B 0.0003%, the balance is Fe, of which CE (Pcm) is 0.20.

[0028] 2. Coil uncoiling and leveling.

[0029] 3. Edge milling, rough milling first, and milling the width of the plate edge by 10-20mm to ensure that the defects existing in the rolling process of the coil plate are removed, and then perform fine milling of the X-shaped groove, and the two butt plate edges of the coil plate Groove with a blunt edge size of 8mm and a groove angle of 35°, respectively, and form a 70° X-shaped groove after the two sides of the coil are butted.

[0030] 4. Forming, the coiled plate is made into a spiral cylinder with a specification of Ф1219mm on a three-roller former. ...

Embodiment 2

[0053] Example 2: Manufacture of X90 grade Φ1219×15.3mm spiral submerged arc welded pipe.

[0054] 1. Use X90 coil with a wall thickness of 15.3mm, and its main alloy element content: C 0.06%, Si 0.22%, Mn2.0%, S 0.002%, P 0.005%, Ni 0.22%, Cr 0.24%, Cu 0.23 %, Nb 0.08%, V 0.02%, Ti0.018%, Mo 0.21%, Al 0.03%, N 0.005%, B 0.0003%, the balance is Fe, of which CE (Pcm) is 0.19.

[0055] 2. Coil uncoiling and leveling.

[0056] 3. Edge milling, rough milling first, and milling the width of the plate edge by 10-20mm to ensure that the defects existing in the rolling process of the coil plate are removed, and then perform fine milling of the X-shaped groove, and the two butt plate edges of the coil plate Groove with a blunt edge size of 7mm and a groove angle of 35°, respectively, and form a 70° X-shaped groove after the two sides of the coil are butted.

[0057] 4. Forming, the coiled plate is made into a spiral cylinder with a specification of Ф1219mm on a three-roller former. ...

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Abstract

The invention discloses a method for manufacturing an X 90 grade pipeline steel large-diameter thick-wall spiral submerged-arc welding pipe. The method comprises the following working procedures: uncoiling, flattening, edge milling, forming, welding, pipe end expanding, X-ray continuous detection, static hydrostatic testing, weld joint and base metal ultrasonic flaw detection, pipe end chamfering, pipe end shooting and finished product inspection; the welding working procedure comprises inside and outside prewelding, finish inside and outside welding; through reasonably selecting welding parameters, a weld joint and base metal can transit smoothly to reduce or eliminate undercut, and the weld joint has excellent mechanical property and ensures obdurability match of the welding pipe and a welded joint; while the pipe end expanding working procedure is carried out, an automatic spiral submerged-arc welding pipe perimeter measuring device is adopted to measure the perimeter in real time, so that real-time measurement and monitoring on the welding pipe perimeter during the forming process are realized, and precise geometric dimensioning of the welding pipe is ensured.

Description

[0001] Technical field: [0002] The invention relates to a method for manufacturing a welded pipe, in particular to a method for manufacturing an X90 grade pipeline steel large-diameter spiral submerged arc welded pipe. [0003] Background technique: [0004] X90 pipeline steel is a multi-component alloy steel with high strength. With the increase of strength, defects such as pouting, misalignment, and micro cracks are prone to appear during the forming process. At the same time, due to the crescent bend problem of the coil itself, it affects the spiral The stability of the welded pipe forming has an adverse effect on the control of the geometric dimensions of the welded pipe in the later process, and brings difficulties to the on-site butt joint construction of the spiral welded pipe. In addition, as the strength of steel grades increases, how to ensure the strength and toughness of welded joints is also a key issue that needs to be solved. Therefore, the development of a we...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/08C22C38/04C22C38/02C22C38/08C22C38/16C22C38/12C22C38/14C22C38/06C22C38/54C22C38/58C22C38/42C22C38/46C22C38/48C22C38/50C22C38/44
CPCB21C37/08C22C38/001C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C22C38/58
Inventor 毕宗岳刘斌牛辉刘海璋张锦刚赵红波陈长青牛爱军赵勇刘刚伟席敏敏
Owner BAOJI PETROLEUM STEEL PIPE
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