X65MS/X70MS spiral submerged-arc welded pipe with excellent SSCC (Sulfide Stress Corrosion Cracking) stress corrosion resistance as well as manufacturing method thereof

A stress corrosion and submerged arc welded pipe technology, applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve the problems of large residual stress and poor uniformity of the welded pipe, achieve low residual stress, less band segregation, and prevent the occurrence of SSCC Effect

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

Foreign loading 72% σ s is the lowest threshold, while domestic welded pipes have large residual stress and poor microstructure uniformity, and SSCC stress loading exceeds 72%σ s Above, loading will produce cracks and break

Method used

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  • X65MS/X70MS spiral submerged-arc welded pipe with excellent SSCC (Sulfide Stress Corrosion Cracking) stress corrosion resistance as well as manufacturing method thereof
  • X65MS/X70MS spiral submerged-arc welded pipe with excellent SSCC (Sulfide Stress Corrosion Cracking) stress corrosion resistance as well as manufacturing method thereof
  • X65MS/X70MS spiral submerged-arc welded pipe with excellent SSCC (Sulfide Stress Corrosion Cracking) stress corrosion resistance as well as manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Φ508×9.5mmX65MS steel grade SSCC stress corrosion resistant spiral submerged arc welded pipe and its manufacture

[0027] 1) Raw material

[0028] The X65MS steel plate with a wall thickness of 9.5mm is used, and its chemical composition is analyzed in the following table (wt%):

[0029] Table 1X65MS chemical composition analysis (wt%)

[0030] C

mn

Si

P

S

Al

Mo

B

Nb+V+Ti

Cu+Ni+Cr

0.05

1.20

0.21

0.009

0.001

0.03

0.006

0

0.07

0.10

[0031] 2) After edge milling, the up-groove angle is 60°, and the blunt edge height is 7-7.5mm;

[0032] 3) According to the actual yield strength level of the coil, adopt the external control forming method, precisely measure and control the position and angle of each forming roller, adjust the inclination angle of the 1# roller to 19° and the inclination angle of the 3# roller to 28°, and reasonably adjust the pressure of the 2# roller ...

Embodiment 2

[0058] Example 2: Manufacture of X70MSΦ711×10mm hydrogen sulfide corrosion-resistant spiral submerged arc welded pipe

[0059] 1) Raw materials

[0060] The X70MS steel plate with a wall thickness of 10mm is used, and its chemical composition is analyzed in the following table (wt%):

[0061] Table 8X70MS chemical composition analysis (wt%)

[0062] C

mn

Si

P

S

Al

Mo

B

Nb+V+Ti

Cu+Ni+Cr

0.05

1.17

0.21

0.007

0.0007

0.027

0.006

0.0004

0.12

0.50

[0063] 2) Edge milling: After edge milling, the angle of the upward groove is 110°, and the height of the blunt edge is 8.5mm;

[0064] 3) Forming: According to the actual yield strength level of the coil, adopt the external control forming method, precisely measure and control the position and angle of each forming roller, adjust the inclination angle of the 1# roller to 18° and the inclination angle of the 3# roller to 26°, and adjust the i...

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Abstract

The invention discloses an X65MS/X70MS spiral submerged-arc welded pipe with excellent SSCC (Sulfide Stress Corrosion Cracking) stress corrosion resistance as well as a manufacturing method thereof. In a welded pipe manufacturing process, the X65MS/X70MS steel-level spiral submerged-arc welded pipe with high strength, high toughness and excellent SSCC stress corrosion resistance can be obtained by mainly adopting technologies such as low-stress forming, anti-corrosion wire welding and flux welding and heat input line energy control. The X65MS/X70MS steel-level spiral seam submerged-arc welded pipe disclosed by the invention has excellent H2S corrosion resistance; an SSCC test is carried out in liquor A by adopting NACE (National Association of Corrosion Engineer) TM0177 standards, specified yield strength stress level of over 90% sigma s is applied, a stretching surface of a test sample is perfect without appearing any cracks, and therefore, the X65MS/X70MS spiral submerged-arc welded pipe is suitable for a high-pressure large-flow oil field gathering pipeline or being used for conveying an acidic oil-gas medium.

Description

Technical field: [0001] The invention belongs to the field of petroleum pipes, and relates to a submerged arc welded pipe and a manufacturing method thereof, in particular to an X65MS / X70MS steel grade spiral submerged arc welded pipe with excellent resistance to SSCC stress corrosion and a manufacturing method thereof. Background technique: [0002] h 2 The presence of S poses a cracking hazard for high yield strength low alloy steels. SSCC cracking is the cracking of the hydrogen accumulation area caused by the combined action of external stress, residual stress and hydrogen pressure. The cracking direction is perpendicular to the tube surface and has the characteristics of delay. [0003] In the process of SSCC, the main function of stress is to make the metal strain, produce slip, and promote the nucleation, expansion and fracture of SSCC cracks. The main sources of stress are load, residual stress and corrosion products. [0004] Global high H 2 S Natural gas produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/54C22C38/12C22C38/14C22C38/22C22C38/24C22C38/26C22C38/28C22C38/16C22C38/44C22C38/46C22C38/48C22C38/50C21D8/10C21D9/50
Inventor 毕宗岳黄晓辉牛辉张锦刚刘海璋张万鹏牛爱军赵红波张君刘斌陈长青杨军包志刚杨耀彬刘刚伟
Owner BC P INC CHINA NAT PETROLEUM CORP
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