EVALUATION OF SURFACE TREATMENTS FOR LOW-ALLOY STEELS, PART 1. TEST METHOD FOR HEAT-RESISTANT CORROSION PROTECTIVE COATINGS ON STEEL

1954 ◽  
Author(s):  
Sam Tour
Keyword(s):  
Protective Coatings ◽  
Surface Treatments ◽  
Test Method ◽  
Low Alloy Steels ◽  
Heat Resistant ◽  
Alloy Steels

scholarly journals Effect of Nickel on the Hydrogen Stress Cracking Resistance of Ferritic/Pearlitic Low Alloy Steels

CORROSION ◽  
10.5006/2724 ◽  
2018 ◽  
Vol 74 (7) ◽  
pp. 801-818
Author(s):  
Hans Husby ◽  
Philip Wagstaff ◽  
Mariano Iannuzzi ◽  
Roy Johnsen ◽  
Mariano Kappes
Keyword(s):  
Oil And Gas ◽  
Nickel Content ◽  
Test Method ◽  
Slow Strain Rate Test ◽  
Low Alloy Steels ◽  
Cracking Resistance ◽  
Stress Cracking ◽  
Sulfide Stress ◽  
Alloy Steels ◽  
Rate Test

Nickel additions to low alloy steels improve mechanical and technological properties. However, Part 2 of ISO Standard 15156 limits the nickel content to a maximum of 1 wt% in oil and gas environments containing H2S because of controversial concerns regarding sulfide stress cracking. The objective of this work was to investigate the effect of nickel in solid solution in the ferrite phase on hydrogen stress cracking resistance. Ferritic/pearlitic research-grade low alloy steels with nominal nickel contents of 0, 1, 2, and 3 wt% were tested by the slow strain rate test method with cathodic hydrogen charging to −1.05 VAg/AgCl and −2 VAg/AgCl. No difference in fracture mode or morphology was found between the alloys. However, the plastic elongation ratios and reduction in area ratios decreased with increasing nickel content when tested at −2 VAg/AgCl. The direct and indirect effects of nickel, such as the influence of an increasing fraction of pearlite with increasing nickel content, are discussed.

Sign in / Sign up

Export Citation Format

Share Document