Fracture toughness of BS 592 Grade A required

[mrgoldthorpe]

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

http://www.analysis.demon.co.uk

 

[TVP]

ASM HANDBOOK Volume 19 Fatigue and Fracture has some fracture toughness data on cast steels. BS 592 was not listed, but perhaps one of the listed grades is similar. Can you post what the composition is supposed to be for this grade? Also, what is the heat treatment supposed to be?

 

[metengr]

The BS is a British Standard. I would suggest contacting the British Standards institute for this information. They should have a 1950 Edition of this Standard with basic material property data pertaining to this specific alloy.

 

[CoryPad]

I recommend not following metengr's advice. BSI have published 38,500 standards, and they will not look up data from one of them just for you.

Regards,

Cory

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[mrgoldthorpe]

Thanks for your responses.
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.

 

[andyenergy]

I don't have BS 592 1950, but the details are contained in BS 3100: 1967.

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

 

[mrgoldthorpe]

Thanks Andy and others. I think I'll try one or two foundries.

 

[Carburize]

I would recommend contacting TWI in Cambridge who have been carrying-out fracture toughness tests on many materials over the time span of your construction and they may have some data relevant to this alloy. They publish a lot of their work through Woodhead Publishing so that might be another source.
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.