Continous Cooling Transformation Diagrams of Various Steels Submitted to Welding (Report 2)
On 52 and 56kg/mm2 High Tensile Steels
1958 Volume 27 Issue 7 Pages 394-400
Details
1958 Volume 27 Issue 7 Pages 394-400
Firstly the continuous cooling transformation diagrams, in case of maximum heating temperature 1350°C, and the continuous heating austenitization diagrams for two kinds of steel of which ultimate tensile strengths are 52 and 55 kg/mm2. And the following data (sec) were obtained:
Cz' Cf' Cp' Ce' 50% MCT
For 52 kg/mm2 steel, 1.7 3.2 8.6 460 5.8
For 55 kg/mm2 steel, 1.7 3.9 25 520 5.5
Then, summarizing the four transformation diagrams obtained in Report 1 and 2, the authors compared and discussed on the four critical cooling times, Cz', Cf', Cp' & Ce', and the 50% martensite cooling times of four kinds of steel in connection with the chemical analyses.
It seems that the values of Cz', Cf' and Ce' increase with the silicon content of steel. And the values of Cp' and 50% martensite cooling time may be increased with the aluminium content of steel.
