The following is a discussion of the article entitled “Microstructural Observations on the Sulfide Stress Cracking of Low Alloy Steel Tubulars,” by S. W. Ciaraldi, published in Corrosion, Vol. 40, No. 2, p. 77 (1984).
DISCUSSION by B. E. Blanchard, Edwin Blanchard Materials Technology Ltd., 3 Bluecoat Yard, Ware, Hertfordshire SG12 9HL England.
The additional microstructural observations on the sulfide stress cracking of low alloy steel tubulars reported by Ciaraldi are of great interest, but I feel that it would be unwise to read too much into the observations of internal cracks and fissures in the nonmetallic inclusions. Such cracks and fissures may well be a general feature of several types of inclusions, as we were obliged to conclude during a study in 1967 of a specially stabilized 2.25% Cr, 1 % Mo low alloy steel. In the as-delivered condition, this normalized and tempered material, after extensive mechanical working to...
