ASME BPVC 2023 Section II part D (metric)

b For materials whose strength has been enhanced by
heat treatment or by strain hardening, the allowable
stress value shown at any temperature in Table 3 is the
least of the following, unless these values are lower than
the annealed values, in which case the annealed values
shall be used:
1 onefifth of the specified minimum tensile
strength at room temperature
2 onefourth of the tensile strength at temperature
3 onefourth of the specified minimum yield
strength at room temperature
4 twothirds of the yield strength at temperature
c In the application of these criteria, the Committee
considers the yield strength at temperature to be SYRY,
and the tensile strength at temperature to be 1.1STRT.
d At temperatures in the range where creep and
stress rupture strength govern the selection of stresses,
the maximum allowable stress value for all materials is
established by the Committee not to exceed the lowest
of the following:
1 100 of the average stress to produce a creep
rate of 0.01/1 000 h
2 100Favg of the average stress to cause rupture
at the end of 100 000 h
3 80 of the minimum stress to cause rupture at
the end of 100 000 h
Stress values for high temperatures are based, whenever
possible, on representative uniaxial properties of the
materials obtained under standard ASTM testing conditions
or equivalent. The stress values are based on basic
properties of the materials and no consideration is given
for corrosive environment, for abnormal temperature and
stress conditions, or for other design considerations.
2-130 CRITERIA FOR BOLTING MATERIALS IN
TABLE 4 FOR USE WITH SECTION VIII,
DIVISION 2, PART 5 AND ANNEX 5.F; AND
WITH SECTION III, SUBSECTIONS NB AND
WB
The allowable stress or design stress intensity value
shown at any temperature in Table 4 is the least of the
following:
a For materials whose strength has not been enhanced
by heat treatment or strain hardening,
1 one-fourth of the specified minimum tensile
strength at room temperature;
2 one fourth of the tensile strength at temperature;
3 two-thirds of the specified minimum yield
strength at room temperature;
4 two-thirds of the yield strength at temperature.
b For materials whose strength has been enhanced