| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.14 ( March 1986 ) Special Issue on Stainless Steels ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Ultra-low C and N High Chromium Ferritic Stainless Steel Keiichi Yoshioka, Shigeharu Suzuki, Noboru Kinoshita, Tadao Hirano, Youichi Hirose, Masao Kurosawa |
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Synopsis : Ultra-low C and N high chromium ferritic stainless steels, SR 26-1, S 30-2 and SR 26-4, have been produced by cost-saving steel making process called the "SS-VOD process". The chemical compositions of the steels are characterized by reducing C and N contents to extremely low levels to improve toughness and corrosion resistance, and by the addition of Nb to prevent intergranular corrosion of weldments. Being free of stress corrosion cracking and superior in corrosion resistance, the steels have been used as materials for heat exchangers and various chemical plants. Especially, S 30-2 and SR 26-4 steels having 2-4% Mo exhibit excellent corrosion resistance on the same level as those of AL-6X and Hastelloy C, and have been applied to heat exchangers for caustic soda plants and rectification towers for acetic acid plants. To obtain weldments having good properties as mentioned above, however, some appropriate measures in welding is necessary. |
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