[国外标准] AS 1830-2007 Grey cast iron
[国外标准] EN 1561-1997 Founding - Grey cast irons
[国外标准] JIS G5501-1995 Grey iron castings
[国外标准] JIS L0805-2005 Grey scale for assessing staining
[国外标准] JIS L0804-2004 Grey scale for assessing change in colour