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Discussion Forums - The Hendrix Group
HomeHomeDiscussionsDiscussionsMaterial Select...Material Select...CA6NM - allowable Aluminum contentCA6NM - allowable Aluminum content
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11/24/2005 9:00 AM
 
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A supplier for SST castings (Wicket Gates) to be used in a hydroelectric project reported an Al content of 0.03% in CA6NM. ASTM A473 and A743 do not give any allowable values. I know that Al can cause embrittlement, but I do not know at what levels this problem becomes serious. As a side note, the physical properties (yield, ultimate) were on the high side, while elongation and reduction in area barely met the ASTM requirements. I would appriciate any comments / experiences you had. Walter Riegler
 
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11/25/2005 9:00 AM
 
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Normally CA 6NM chemistry does not call for any Aluminium %. This should not be an intentional addition. But if it exist the % of Al should be within 1%. Al improves resistance to oxidation but if excess it can cause weldability problems. In you case 0.03% is a reasonable amount and presume to be an unintentinal additions. Not to worry. OK regards DM and if you had any further informations pl. share Debasis.Mitra@hpl.co.in
 
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