Exterior protective member made of austenitic stainless...

Details Exterior protective member made of austenitic stainless... Exterior protective member made of austenitic stainless...

C - Chemistry, Metallurgy

22

C

75/98

C22C 38/40 (2006.01) H05B 3/48 (2006.01)

Patent

CA 1306123

ABSTRACT OF THE DISCLOSURE Particularly important properties required for exterior protective members for sheathing heaters are resistance to oxidation, anti-stress corrosion properties and weldability. The austenitic stainless steel for the exterior protective members has been developed from the findings, firstly the resistance to oxidation can be remarkably improved by increasing the Cr content together with a combined addition of Al and rare earth metals, secondly a small amount of Co addition is effective to enhance the alloy to withstand stress corrosion cracking in the environment to which sheathing heaters are subjected and that the weldability of such members can be made superior by maintaining the content of Si and Ti within a specified region. In other words, characteristic feature of the steel to be used consists essentially, all by weight, of 19-23% Ni, exceeding 23% but not more than 25% Cr, not more than 1% Mn, not more than 0.7% Si, not more than 0.3% Ti, not more than 0.03% C and the ratio Ti/C more than 5 inclusive, not more than 2% Co, not more than 0.3% Al, not more than 0.03% REM and the balance being Fe and incidental impurities.

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