| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.40 ( May 1999 ) Steinless Steel and Steel Platel ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Microstructure Control for Improving Sour
Resistance of Pressure Vessel Steel Plates
and Their Performance Fumimaru Kawabata, Osamu Tanigawa, Ichiro Nakagawa |
| Synopsis: This paper examined technologies to advance the pressure vessel steels in the resistance to hydrogen-induced cracking (HIC) and sulfide stress corrosion cracking (SSC) and to make them applicable in wet H2S environments. The heavy gauge plates of ASTM A516-70 grade up to 127 mm in thickness and the A841 cl.l grade of 50.8 mm in thickness with high welding performance have been manufactured with such technologies. HIC resistance has been remarkably improved by reducing the sulfur content and the clustering-free shape-control of MnS, the latter of which is carried out with the ACR value control (1 to 3) by the addition of Ca. The effectiveness of the thermo-mechanical control process (TMCP) in preventing SOHIC was indicated by the model and was proved for the new A841 steel plate of the TMCP type. |
| TextiPDF: 9P/426kbj |