API RP 581 - 3rd Ed.2016 - Add.2-2020 - Risk-Based Inspection Methodology

RISK-BASED INSPECTION METHODOLOGY, PART 2—PROBABILITY OF FAILURE METHODOLOGY 2-155
Table 23.2—Data for Property Trends of Toughness vs Temperature—Sigma Phase
Test
Temperature
304 SS
2 % SIGMA
321 SS
10 % SIGMA
304 SS
1 % SIGMA
304 SS
2 % SIGMA
347 SS
1 % SIGMA
°C °F
% of
Impact
%
Shear
% of
Impact
%
Shear
% of
Impact
%
Shear
% of
Impact
%
Shear
% of
Impact
%
Shear
21 70 21 0 7 0 — — 21 10 50 90
260 500 38 25 10 20 — — — — 100 100
482 900 44 50 15 40 20 10 — — 100 100
649 1200 63 100 21 60 71 90 77 90 100 100
Table 23.3—DF—Sigma Phase
T min
Evaluation Temperature
DF as a Function of Sigma Content
(°C) (°F) Low Sigma Medium Sigma High Sigma
649 1200 0.0 0.0 18
538 1000 0.0 0.0 53
427 800 0.0 0.2 160
316 600 0.0 0.9 481
204 400 0.0 1.3 1333
93 200 0.1 3 3202
66 150 0.3 5 3871
38 100 0.6 7 4196
10 50 0.9 11 4196
−18 0 1.0 20 4196
−46 −50 1.1 34 4196