Transactions of the Korean Society of Pressure Vessels and Piping (한국압력기기공학회 논문집)

Korean Society of Pressure Vessels and Piping (한국압력기기공학회)
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Effect of Post Weld Heat Treatment on the Mechanical Properties of 2.25Cr-1Mo Steels Valves and Piping

용접후열처리가 2.25Cr-1Mo 강 밸브 및 배관재 물성에 미치는 영향

  • Received : 2015.06.12
  • Accepted : 2015.06.26
  • Published : 2015.06.30
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Abstract

The effects of post weld heat treatment(PWHT) on the mechanical properties of 2.25Cr-1Mo steels were investigated. As the PWHT temperature or holding time increased, the strength of low alloy steels progressively decreased due to softening process. After the conventional PWHT, the strength was larger than the minimum value of materials specification. The Charpy impact energy was hardly affected by the conventional PWHT. The trend of mechanical properties was analyzed in terms of tempering parameter. Most materials replaced from a power plant met the requirements of materials specification except for one heat. Same heat of materials with low impact energy were attributed to the voids formed during casting process.

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References

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