Metallurgical Factors Controlling SSC Resistance of High-Strength, Low-Alloy Steels
- 1 June 1989
- journal article
- Published by Association for Materials Protection and Performance (AMPP) in Corrosion
- Vol. 45 (6) , 519-527
- https://doi.org/10.5006/1.3582053
Abstract
Metallurgical factors affecting SSC resistance of low-alloy steel having yield strength of 600 MPa to 900 MPa were investigated. A new characteristic value of SSC resistance, namely an SSC critical strength, σc, defined in the text, was introduced on the basis of experimental results and some analysis. σc approximately coincides with a peak strength, σypeak, also defined in the text. σc Is influenced by metallurgical factors, that is, σc decreases with an increase in Mn and P contents and increases with an increase in Mo content and a refinement of grain size, while these metallurgical factors have no pronounced effects on SSC threshold stress, σth, at yield strength below σc. Further, σc is linearly related to a newly derived compositional parameter, an A-value, which is Mn + 4.3P + 17.0Mn · P. By introducing the new parameter, σc, effects of metallurgical factors on SSC resistance could be explained consistently. As the results of fundamental investigations, principles of material design of SSC...Keywords
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