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X80-level straight seam submerged-arc welded pipe with hydrogen sulfide stress corrosion resistance as well as manufacturing method thereof

A technology of straight seam submerged arc welding and stress corrosion, which is applied in the field of welding to achieve the effects of excellent formability and degassing, high purity and uniform structure

Active Publication Date: 2014-01-29
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

Therefore, as the strength and hardness of oil and gas pipeline steel pipes increase, SSCC is very prone to occur, so there is an urgent need to develop high-strength X80 acid-resistant steel pipes for corrosive environments

Method used

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  • X80-level straight seam submerged-arc welded pipe with hydrogen sulfide stress corrosion resistance as well as manufacturing method thereof
  • X80-level straight seam submerged-arc welded pipe with hydrogen sulfide stress corrosion resistance as well as manufacturing method thereof
  • X80-level straight seam submerged-arc welded pipe with hydrogen sulfide stress corrosion resistance as well as manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Example 1: Manufacture of Ф813×15.3mmX80MS steel grade hydrogen sulfide corrosion resistant longitudinal submerged arc welded pipe

[0046] 1) Raw material

[0047] The X80MS steel plate with a wall thickness of 15.3 mm is used, and its chemical composition analysis is as follows in Table 1:

[0048] Table 1X80MS chemical composition analysis (%)

[0049] C

Si

mn

P

S

Cr

Cu

Ni

Mo

Nb

Ti

Al

B

Ca

0.032

0.29

1.59

0.007

0.0009

0.09

0.11

0.17

0.22

0.06

0.07

0.07

0.0003

0.0008

[0050] 2) Edge milling and pre-bending of the steel plate: after edge milling, the angle of the upward groove is 80°, the angle of the downward groove is 75°, and the height of the blunt edge is 6mm;

[0051] 3) After the milled steel plate is centered on the roller table, the steel plate is deformed to meet the radian requirements of the forming process design through the ext...

Embodiment 2

[0077] Example 2: Manufacture of Ф813×17.5mm X80MS steel grade hydrogen sulfide corrosion resistant longitudinal submerged arc welded pipe

[0078] 1) Raw material

[0079] The X80MS steel plate with a wall thickness of 17.5mm is used, and its chemical composition is analyzed in the following table:

[0080] Table 7: X80MS chemical composition analysis

[0081] C

Si

mn

P

S

Cr

Cu

Ni

Mo

Nb

Ti

Al

B

Ca

0.032

0.30

1.58

0.007

0.0009

0.09

0.12

0.17

0.23

0.06

0.07

0.06

0.0003

0.0007

[0082] 2) Steel plate edge milling and pre-bending: after edge milling, the angle of the up groove is 100°, the angle of the down groove is 80°, and the height of the blunt edge is 8mm;

[0083] 3) After the milled steel plate is centered on the roller table, the steel plate is deformed to meet the radian requirements of the forming process design through the extrusion of the u...

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Abstract

The invention discloses an X80-level straight seam submerged-arc welded pipe with hydrogen sulfide stress corrosion resistance as well as a manufacturing method thereof. The straight seam submerged-arc welded pipe comprises a welding seam and a welded pipe body, and is characterized in that the welded pipe body consists of the following elements in percent by mass: not greater than 0.04% of C, 0.20%-0.40% of Si, 1.20%-1.80% of Mn, not greater than 0.008% of P, not greater than 0.002% of S, 0.10%-0.30% of Ni, not greater than 0.15% of Cr, not greater than 0.15% of Cu, 0.01%-0.10% of Nb, 0.01%-0.10% of Ti, 0.10%-0.30% of Mo, 0.04%-0.10% of Al, not greater than 0.0005% of B, not greater than 0.002% of Ca, and the balance of Fe and inevitable impurities. According to the X80-level straight seam submerged-arc welded pipe and the manufacturing method thereof disclosed by the invention, the X80 straight seam submerged-arc welded pipe disclosed by the invention has good strength, toughness, welding performance, ductility and corrosion resistance through reasonably deploying and controlling material components, a manufacturing process, a manufacturing technology and subsequent processing. Besides, high-pressure large-flow conveying requirements of oil gas under an acidic environment are satisfied.

Description

Technical field: [0001] The invention belongs to the field of welding, and relates to a straight seam submerged arc welded pipe and a manufacturing method thereof, in particular to an X80-grade straight seam submerged arc welded pipe resistant to hydrogen sulfide stress corrosion and a manufacturing method thereof. Background technique: [0002] High steel grade and large pipe diameter have become the general trend of pipeline steel pipe development. Increasing the conveying working pressure and increasing the diameter of the pipeline can improve the conveying efficiency and thus improve the economic benefits of the pipeline operation. With the development of my country's natural gas industry, long-distance pipeline construction will enter a period of rapid development in the next few years, and high-grade pipeline steel has broad application prospects. X80 pipeline steel, as a high-grade pipeline steel for long-distance pipelines that is mainly developed in my country, has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/54B21C37/08
Inventor 毕宗岳牛辉张万鹏张锦刚刘海璋黄晓辉赵红波牛爱军张君陈长青刘斌包志刚杨军
Owner BC P INC CHINA NAT PETROLEUM CORP
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