Low-temperature mechanical behavior of an “acicular” ferrite HSLA (high strength-low alloy) line pipe steel

AbstractThe microstructural characterizations and partitioning of carbon element in the weld heat affected zones of a commercial API 5L X60 line pipe steel were studied by applying a high speed heating and cooling dilatometry technique in the present research work. The hollow cylindrical specimens were quickly heated to 1000°C, soaked for only 5 s followed by continuous cooling to ambient temperature. Besides the construction of CCT diagram of this high strength low alloy steel using the dilatation data, the hardening response, microstructural features and carbon partitioning of weld simulated specimens were investigated. The obtained results showed that the hardening response of samples increased from 142 to 261HV10kg with increasing cooling rates. These hardening variations were attributed to the changes in microstructural features and carbon partitioning that occurred between the microconstituents present in the microstructures of weld simulated samples.

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Influence of Softened Heat-affected Zone on Stress Oriented Hydrogen Induced Cracking of a High Strength Line Pipe Steel.

ISIJ International ◽

10.2355/isijinternational.35.1190 ◽

1995 ◽

Vol 35 (10) ◽

pp. 1190-1195 ◽

Cited By ~ 5

Author(s):

Akihiko Takahashi ◽

Hiroyuki Ogawa

Keyword(s):

Heat Affected Zone ◽

Pipe Steel ◽

High Strength ◽

Line Pipe ◽

Hydrogen Induced Cracking ◽

Line Pipe Steel

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Effect of Prestrain on Fracture Toughness of Line Pipe Steel at Low Temperature

Journal of Mechanical Engineering ◽

10.3901/jme.2011.24.026 ◽

2011 ◽

Vol 47 (24) ◽

pp. 26

Author(s):

Guangchun XIAO

Keyword(s):

Fracture Toughness ◽

Low Temperature ◽

Pipe Steel ◽

Line Pipe ◽

Line Pipe Steel

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Exploiting a Simple Spectrophotometric Method for the Determination of Manganese in High Strength Line Pipe Steels

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.284-286.1158 ◽

2011 ◽

Vol 284-286 ◽

pp. 1158-1164

Author(s):

Xiaodong Shao

Keyword(s):

Spectrophotometric Method ◽

Pipe Steel ◽

High Strength ◽

Ammonium Persulfate ◽

Pipe Steels ◽

Line Pipe ◽

Relative Standard ◽

Characteristic Wavelength ◽

Line Pipe Steel

The use of high strength line pipe steels is beneficial for the reduction the cost of gas transmission pipelines by enabling high pressure transmission of large volumes of gas. The high strength line pipe steels will become the preferred materials for modern natural gas transmission pipeline. It was well known that manganese was an important element in the high strength line pipe steels. In this paper, a simple spectrophotometric method was described for determination of manganese in high strength line pipe steels. The method was based on the oxidation-reduction reaction between ammonium persulfate and manganese(II) producing manganese(VII) in the presence of silver nitrate as a catalyst. The characteristic wavelength of maximum absorption of manganese(VII) was obtained locating at 530 nm. Under the optimum reaction conditions the absorption value was proportional to the concentration of manganese in the range of 0.18%~2.0% (R2 = 0.9997), and the relative standard deviation was less than 3.0% (n=5). The proposed method was applied successfully to determine manganese in API grade X80 line pipe steel and API grade X70 line pipe steel samples.

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