• Enzinger, Norbert
• Ghanimi, Yassar
• Orsi, Alice

Abstract

Stainless steel 1.4418 is a promising martensitic steel which combines high<br/>mechanical properties with good corrosion resistance due to a higher content of Cr and Mo<br/>compared with lower alloyed martensitic steel such as 1.4313. Its content of Mo suggests also<br/>a high resistance to stress corrosion cracking in sulphur and chloride enriched environment<br/>comparable with supermartensitic steel specifically developed for oil and gas industry and<br/>available only as pipes. A recent increase in its availability also as plate materials opens its<br/>field of applications in areas where corrosion together with high mechanical strength are<br/>required.<br/>In the present work welded and seamless samples made of 1.4418 bent under constant<br/>tensile stress were tested in a moisture saturated environment in presence of chloride and<br/>sulphuric acid at room temperature, 80°C and 100°C for 6 months. No cracks or signs of<br/>corrosion were found on the samples suggesting the suitability of this material in particularly<br/>aggressive environments

Topics

• impedance spectroscopy
• stainless steel
• crack
• strength
• stress corrosion
• Sulphur