A methodology for selecting the minimum usage temperature
for ferritic steels
has previously been developed. The methodology is based
on the statistical
correlation between fracture toughness and Charpy-V, and
has been verified for
modern extra high strength steels.
Here, the methodology is verified experimentally with
different test geometries
for old (post Second World War quality) thin low strength
steels. Based upon
the investigations the following can be concluded:
1. The validation of the methodology as a whole appears
2. The methodology seems capable of producing reliable
"best" and "safe"
estimates with equal accuracy.
3. Compared to extra high strength steels, the
methodology shows a
tendency to treat low strength steel somewhat more
conservatively, but not
4. The methodology appears superior to all previous
5. The results show that a single transition temperature
requirement of 28/27 J can well be applied for these
types of old steels.
6. For the first time it is possible to develop rules
that treat low and
high strength steels impartially and are capable of
giving accurately defined
safety levels for different situations.
|Place of Publication||Espoo|
|Publisher||VTT Technical Research Centre of Finland|
|Number of pages||56|
|Publication status||Published - 1995|
|MoE publication type||Not Eligible|
- mechanical properties
- fracture strength
- Charpy impact tests