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A Study on the Mechanical Property and Microstructure of SA213 P92 Boiler Pipe Steel

보일러 배관용 P92 파이프강의 기계적 특성 및 미세조직에 관한 연구

  • Kim, Beom Soo (Power Generation Lab, Korea Power Research Institute) ;
  • Son, Tae Ha (Power Generation Lab, Korea Power Research Institute) ;
  • Min, Taek Ki (School of Mechanical and Nano Mechatronics, Chungnam National University)
  • 김범수 (한전전력연구원 그린에너지연구소) ;
  • 손태하 (한전전력연구원 그린에너지연구소) ;
  • 민택기 (충남대학교 기계.기계설계 나노메카닉스공학부)
  • Received : 2011年12月07日
  • Published : 2012年11月10日

Abstract

The hardness and strength test was performed to make the manufacturing process of SA213 P92 boiler pipe steel. And the microstructure change was studied to find out the cause of room temperature property of P92 steel, ie, low hardness and strength property. The room temperature property of P92 steel depends on the improper normalizing and cooling rate. Especially, Ferrite was formed and the steel had low hardness when the temperature was decreased slowly under the cooling rate 1ドル^{\circ}C$/min after normalizing at the temperature around $A_{c1}$ to $A_{c3}$. The critical heat treatment temperature and cooling rate was over 900ドル^{\circ}C$ and over 10ドル^{\circ}C$/min to satisfy the minimum yield and tensile stress which was laid down by ASME Code.

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