Ferrite test
Ferrite test
(OP)
Hi,
We got a valve cast body from a foundry. The body made from SA-995 grade 4A they give the result of Ferrite content 52% tested I.A.W ASTM E 562 of the cast body. Our allowable ferrite range is 35% to 55%.
But after machining it and tested ferrite content on the machined surface with Fischer Ferrite Scope and shows the result above 60%. Ferrite Scope has been calibrated with standard sample.
Thanks
We got a valve cast body from a foundry. The body made from SA-995 grade 4A they give the result of Ferrite content 52% tested I.A.W ASTM E 562 of the cast body. Our allowable ferrite range is 35% to 55%.
But after machining it and tested ferrite content on the machined surface with Fischer Ferrite Scope and shows the result above 60%. Ferrite Scope has been calibrated with standard sample.
Thanks





RE: Ferrite test
RE: Ferrite test
The MFR decided to grind down some weld metal from the top layer (the excess external reinforcement). He then measured the FN again, and found a value that was lower (and within the acceptable range).
This seems to be a parallel to what azizur447describes in his second para. Any one who knows why/how this is caused?
RE: Ferrite test