Mf-temperature for 2,25%Cr-1Mo -steel

By R-win

Date 08-31-2004 07:38

Who can tell me Mf-temperature or show me a TTT-diagram with Mf-temperature for 2,25Cr-1Mo?

By GRoberts (***)

Date 08-31-2004 15:09

Ms=521-353C-22Si-24.3Mn-7.7Cu-17.3Ni-17.7Cr-25.8Mo
MS =1042-853C - 60Mn -30Cr - 30Ni - 38Mo

Here are a couple of equations used to determine martensite start temperatures. The Mf temperature is calculated by Ms-385. All temps are in degrees Fahrenheit.

By johannes (*)

Date 09-01-2004 13:06

The CCT diagram I have shows an Ms at about 480°C, the curve moves upward as the time increase (more than about 10s). The 90% line lies at about 310° at times below 10 seconds but are over 400°C at 100 seconds. The Mf line is at about 180° at 10 seconds.

Hope this help