Fracture toughness of BS 592 Grade A required
Fracture toughness of BS 592 Grade A required
(OP)
I am searching for typical values of fracture toughness of cast steel to BS 592:1950 Grade A, particularly at about 3 degrees C. It concerns an item of plant constructed about 40 years ago.
Can anyone help?
Thanks in anticipation.
Martin
Can anyone help?
Thanks in anticipation.
Martin





RE: Fracture toughness of BS 592 Grade A required
RE: Fracture toughness of BS 592 Grade A required
RE: Fracture toughness of BS 592 Grade A required
Regards,
Cory
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Fracture toughness of BS 592 Grade A required
Unfortunately, at the moment I have no records of composition or heat treatment. I have minimum Charpy energies from the standard BS 3100 Grade A1 which replaced BS 592 Grade A. Using Charpy correlations gives a low toughness of about 30 MPa root metres. I would like to see typical values of measured toughness for such BS 592 castings, if available, to decide whether or not it may be worth pursuing this further. I'll follow this post if I can get more data.
RE: Fracture toughness of BS 592 Grade A required
BS 592 Grade A was:
0.25% C max,
0.9 % Mn (max),
0.6% Si, (max)
0.06% S&P.
Ni 0.40*
Cr 0.25*
Mo 0.15*
Cu 0.30*
*residuals not to exceed 0.80%
UTS min 28 tsi
Yield min 15 tsi
El 22%
izod impact value 15 ftlb (either an impact or a bend to be carried out).
All castings to be supplied in heat treated condition. The heat treatment shall be carried out at a suitable temperature to give the mech properties required. (not very helpful).Perhaps this might help TVP.
Brtish Standards don't carry fracture toughness data in their documents. Unfortunately, we have no data for this material.
Alternatively, you might want to give a good casting producer a ring, or the Institute of Materials or a university engineering dept. Try UMIST.
Andy
RE: Fracture toughness of BS 592 Grade A required
RE: Fracture toughness of BS 592 Grade A required
As an aside - I think that 30 - 40 Ksi sq rt in toughness is a reasonable estimate for the type and vintage of material you are dealing with.