A289 Gr 18Mn18Cr steel forged ring
2014-12-05 19:06:22 Origin： Remark：0 Click：
(1)Mn18Cr18 (2)18Mn18Cr (3)P900 (4)50Mn18Cr5 (5)50Mn18Cr4WN
The steel shall be made by the electro-slag-remelt (ESR)process. The electrodes shall be made by either the basic electric furnace or ladle refining processes.
Sufficient discard shall be taken from each ingot to secure freedom from piping and undue segregation.
Forged rings shall be solution treated following hot working and prior to the cold expansion procedure.
Rings shall be rough machined prior to cold expansion or final heat treatment.
Rings shall be expanded by an appropriate method such as segmented dies, tapered plug, etc. in the temperature range of 60 to 390°F [15 to 200°C] in order to develop the required tensile properties.
After cold expansion, the rings shall be heated to between 575 and 750°F [300 to 400°C] at a rate not to exceed 75°F [40°C]/h, held at this temperature for 6 to 12 h, and then slow cooled to ambient temperature.