| Title |
A Study on the Mechanical Property and Microstructure of SA213 P92 Boiler Pipe Steel |
| Authors |
김범수(Beom Soo Kim) ; 손태하(Tae Ha Son) ; 민택기(Taek Ki Min) |
| DOI |
http://dx.doi.org/10.6110/KJACR.2012.24.11.777 |
| Keywords |
9Cr-2W강 ; 냉각속도 ; 저경도 ; 초초임계압 ; 성형 후열처리 ; 용접 후열처리 ; 에칭액 SA213 P92 ; Cooling rate ; Low hardness ; USC ; PFHT ; PWHT ; Vilella |
| 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℃/min after normalizing at the temperature around Ac1 to Ac3. The critical heat treatment temperature and cooling rate was over 900℃ and over 10℃/min to satisfy the minimum yield and tensile stress which was laid down by ASME Code. |