Common material with an endurance limit (fatigue cracking cannot occur below this stress level)
CS 571: 4.2.16.3.b.i
Subject to temper-embrittlement
Low Chromes 574: 7.4.12.1
Common material without an endurance limit
SS 571: 4.2.16.3.b.ii
Subject to chloride stress-corrosion cracking
300 SS 574: 7.4.8.1.a
Subject to polytheonic acid stress-corrosion cracking
Sensitized 300 SS 574: 7.4.8.1.b
P-numbers allowed to use pre-heat in lieu of PWHT
P1 & P3 570: 8.2.3.2