A kind of x80 large-diameter thick-walled straight seam submerged arc welded pipe suitable for low temperature and its manufacturing method

A technology of straight seam submerged arc welding and manufacturing method, which is applied in the direction of manufacturing tools, arc welding equipment, welding equipment, etc., to achieve good low temperature toughness, excellent low temperature toughness, and the effect of eliminating undercuts

Active Publication Date: 2020-07-28
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, there is no reference at home and abroad to the X80 steel grade, which is suitable for low-temperature environments and has excellent low-temperature toughness, with a pipe diameter of 1422 mm and a wall thickness > 30 mm.

Method used

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  • A kind of x80 large-diameter thick-walled straight seam submerged arc welded pipe suitable for low temperature and its manufacturing method
  • A kind of x80 large-diameter thick-walled straight seam submerged arc welded pipe suitable for low temperature and its manufacturing method
  • A kind of x80 large-diameter thick-walled straight seam submerged arc welded pipe suitable for low temperature and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1: Manufacture of X80 steel grade Φ1422×30.8mm low-temperature LSAW pipe.

[0035] (1) Raw material, X80 steel grade hot-rolled steel sheet with a wall thickness of 30.8mm is used, and its main alloying element content: C0.05%, Si 0.21%, Mn 1.67%, S 0.001%, P 0.010%, Ni 0.18%, Cr 0.16%, Cu 0.21%, Nb 0.07%, V 0.005%, Ti 0.016%, Mo 0.12%, Al 0.03%, N 0.006%, B 0.0003%, and the balance is Fe.

[0036] (2) Ultrasonic inspection of steel plate, 100% ultrasonic inspection of steel plate.

[0037] (3) For milling, the bevel size is 70° for the upper bevel, 70° for the lower bevel, 11.5mm in the depth of the lower bevel, and 10.0mm in the blunt edge.

[0038] (4) Pre-bending the edge, using a pre-bending machine to pre-bend the edge of the board to make the edge curvature meet the requirements.

[0039] (5) JCO forming, in the forming machine, first press one side of the pre-bent steel plate into a "J" shape, and then press the other half of the steel plate in the same way and p...

Embodiment 2

[0057] Example 2: Manufacture of X80 steel grade Φ1422×33.8mm low temperature longitudinal submerged arc welded pipe.

[0058] (1) Raw material: X80 steel grade hot-rolled steel sheet with a wall thickness of 33.8mm is used. The main alloying element content: C0.07%, Si 0.25%, Mn 1.65%, S 0.002%, P 0.010%, Ni 0.19%, Cr 0.24%, Cu 0.12%, Nb 0.05%, V 0.04%, Ti 0.016%, Mo 0.20%, Al 0.03%, N 0.005%, B 0.0003%, and the balance is Fe.

[0059] (2) Ultrasonic inspection of steel plate, 100% ultrasonic inspection of steel plate.

[0060] (3) For milling, the bevel size is 70° for the upper bevel, 70° for the lower bevel, 12.5mm in the depth of the lower bevel, and 10.0mm in the blunt edge.

[0061] (4) Pre-bending the edge, using a pre-bending machine to pre-bend the edge of the board to make the edge curvature meet the requirements.

[0062] (5) JCO forming, in the forming machine, first press one side of the pre-bent steel plate into a "J" shape, and then press the other half of the steel pla...

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Abstract

The invention discloses an X80 large-diameter thick-wall longitudinal submerged arc welding pipe applicable to the low temperature and a manufacturing method thereof. A parent material of the weldingpipe comprises, by mass percentage, 0.04-0.08% of C, 0.15-0.30% of Si, 1.60-1.85% of Mn, less than or equal to 0.004% of S, less than or equal to 0.010% of P, 0.15-0.30% of Ni, 0-0.30% of Cr, 0.1-0.3%of Cu, 0.05-0.10% of Nb, 0.005-0.04% of V, 0.015-0.03% of Ti, 0.10-0.35% of Mo, 0.02-0.05% of Al, less than or equal to 0.008% of N and 0.0003-0.0005% of B. The manufacturing method comprises the steps of preparing a hot rolled steel plate according to the mass percentages of the chemical compositions; and conducting ultrasonic inspection, edge milling, pre-flanging, JCO formation, prewelding, inner welding, outer welding, welding seam X-ray inspection, steel pipe expanding, hydrostatic testing, welding seam ultrasonic testing, pipe end X-ray inspection, chamfering, pipe end magnetic particletesting and appearance quality inspection on the steel plate. A welding joint of the welding pipe is good in low-temperature toughness; and on the premise that heat treatment is not conducted on thewelding pipe after pipe manufacturing, the welding pipe can be directly used at the temperature of minus 45 DEG C or even lower.

Description

Technical field: [0001] The invention relates to a straight seam submerged arc welded pipe and a manufacturing method thereof, in particular to a X80 large-caliber thick wall straight seam submerged arc welded pipe suitable for low temperature and a manufacturing method thereof. Background technique: [0002] With the continuous development of oil and natural gas exploration in the alpine and tundra and the continuous pursuit of pipeline transportation efficiency and economy, the demand for large-diameter, low-temperature submerged arc welded pipes is increasing. my country is a country with complex natural environment. When oil and gas pipelines pass through some high-cold regions in northeast and northwest of my country, the winter temperature is relatively low. The average temperature in cold months is -14℃~-24℃, and the extreme minimum temperature is -48.1℃. The minimum metal design temperature is -45℃. Under the premise of not using heat preservation measures, the current sub...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58B21C37/08B23K9/025B23K9/16B23K9/18B23K35/30B23K35/362B23K35/38
CPCB21C37/08B21C37/0807B23K9/0253B23K9/164B23K9/18B23K35/3026B23K35/362B23K35/383C22C38/02C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58
Inventor 刘斌刘云毕宗岳牛辉张鹏赵红波包志刚牛爱军席敏敏杨耀彬田磊
Owner BC P INC CHINA NAT PETROLEUM CORP
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