|Specifying Body||Spec. No.||Use||Class or Grade||Min. Tensile psi||Other Requirements|
|ASTM||A48-94||Castings intended for general engineering use where strength is a major consideration. Written exception to this specification takes precedence||20
I Test bar size shall be related in cooling rate to the critical section of the casting and so specified.
II At least two (2) test bars shall be cast and prepared for each casting lot. the lot size being designated.
Ill Test bars shall be cast in dry silica sand molds similar to that in which the castings are poured.
IV Tension test shall be under true axial loading.
V Hardness, chemical composition. microstructure, pressure tightness, radiographic soundness, dimension, surface finish, etc., can be estab- lished as requirements upon written agreement between manufacturer and purchaser.
|ASTM SAE||A159-83 J431||Automot ive Gray Iron Castings.
Cast in sand molds fo r the automobile, truck, tractor, and allied industries.
|Brinell Hardness||Total Carbon %||Micro- structure|
|G1800||187 Max.||Ferritic -Pearlitic|
|G2500a||170-229||3.40 Min. Mandatory||“A” Graphite size 2-4 15% max. ferrite|
|G3S00b||207-255||3.50 Min. Mandatory||“A” Graphite size 3-5
5% max. ferrite or carbide
|G3S00c||207-255||3.40 Min. Mandatory||Type VII Graphite size 3-5 5% max. ferrite or carbide|
|G4000d||241-321||Alloys specified||Carbides and pearlite|