1999PREN 2239-1999 Heat Resisting Steel FE-PA91-HT Solution Treated and Precipitation Treated Forgings Aerospace Series (Edition 2)
1995PREN 2239-1995 Aerospace Series Heat Resisting Steel FE-PA4901 Solution and Precipitation Treated Forgings De Less Than or Equal to 100 mm (Edition EN)
1979PREN 2239-1979 Heat Resisting Steel FE-PA91-HT Solution Treated and Precipitation Treated Forgings Aerospace Series (Edition 1)