3Cr-1Mo Steel

Steel name: 3Cr-1Mo
Diagram No.: 4927
Type of diagram: CCT
Chemical composition in weight %: 0.15% C, 0.4% Mn, 3.0% Cr, 0.7% Mo, 0.7% Ni, 0.28% V
Steel group: Ferritic steels
Note: Austenitizing temperature: 1100 C/10 min. The materials used for the investigations are a new member of 3Cr-1Mo class of low alloy steel and a plain 12Cr tempered martensitic steel. This 3Cr-1Mo type steel is a new generation nuclear reactor pressure vessel material with optimized composition to mitigate temper and irradiation embrittlement[1]. The AISI 403 steel is used for end fitting applications in pressurized heavy water reactor. The respective chemical compositions of the two steels are given in table 1. A deformation dilatometer Bahr DIL 805 was operated in the quenching mode for the dilatometry studies. Hollow tubular samples of outside diameter (O.D) 4.0 mm, 250ìm th ickness and 10 mm length were used for the tests. The sample was placed between two alumina rods, one of which was connected to a LVDT with less than 1ìm resolution for measuring the change in length during the phase transformations. A thermocouple was spot welded to the O.D of the sample and it was inductively heated to the austenitic temperature. The heating rate of 100°C/min was employed for all tests for carrying the austenitising of the sample at 1100°C for 10 minutes. For the purpose dilatometry studies a series of samples were cooled over the cooling rate range 1075°C/min to 2.2°C/min. The sample change in length (ÄL) and temperature (T) were acquired online by a 16 bit DAQ during the entire heat-hold-cool cycle.
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