| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.13 ( September 1985 ) ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Fe-36% Ni Invar Type Alloy KLN 36 for LNG Facilities Kiyohiko Nohara, Akio Ejima |
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Synopsis : Since Fe-36%Ni steel (Inver type alloy) exhibits low thermal expansively, it has been used as the membrane material for LNG facilities. However, there is a drawback of so high susceptibility to hot cracking during welding due to its complete austenitic structure. As a result of study on the influence of chemical compositions of various elements and some conditions in manufacturing processes, it is made clear that both lowering of impurity elements and addition of tantalum can markedly improve the resistance to hot cracking during welding. This is in accordance with the result of a thermal cycle simulation experiment. The study is also made on physical properties including thermal expansively and mechanical properties of this improved steel (KSC's low thermal expansion alloy: KLN 36) to show that it is totally furnished with assorted characteristics as the LNG material. |
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