API 959 : 1982

Section
I Introduction
II General conclusions from program
III Phase I: step cooled embrittlement experiments and
      material characterization
IV Phase II: isothermal embrittlement experiments
V The effect of de-embrittlement
VI The effect of specimen notch orientation
VII Prediction of long term isothermal embrittlement
VIII The effect of repeated de-embrittlement on
      isothermal embrittlement at 875 deg F
IX The effect of strength level and structure on
      temper embrittlement
X The segregation of elements to grain boundaries
      in Cr-Mo steels after 20,000 hr isothermal
      embrittlement assessed by Auger methods
XI Fracture toughness evaluation (JIc) of
      unembrittled and isothermally embrittled sample
      no. 75
XII A study of the effect of high pressure hydrogen on
      the temper embrittlement characteristics of Cr-Mo
      steels
XIII Isothermal embrittlement of 1-1/4Cr - 1/1Mo and
      3Cr - 1Mo samples at 875 deg F
XIV Acknowledgements
XV References
Tables 1 to 29
Figures 1 to 68
Appendix: Discussion of the Charpy test
(a) Sources of error in Charpy impact test data
(b) The Charpy specimen fracture appearance
(c) Experimental scatter in the 40 ft-lb transition
     temperature
Figures A1 to A4

Presents the results of the study of repeated de-embrittlement on two isothermally embrittled steels and the effect of strength level and structure on the isothermal embrittlement of one sample of steel.