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Hardness
The foundry shall exercise the necessary controls and inspection techniques to ensure compliance with the specfied hardness range,Brinell hardness shall be determined in accordance with Test Method E10,after sufficient material has been removed from the casting surface to ensure representative hardness reading,The 10-mm ball and 3000-kg load shall be used unless otherwise agreed upon.The area or areas on the casting where hardness is to be checked shall be established by agreement between supplier and purchaser and shall be shown on the drawing.
Heat Treatment
1.Unless otherwise specified,castings of Grades G1800 and G2500 may be annealed in order to meet the desired hardness range.
2.Appropriate heat treatment for removal of residual stresses,or to improve machinabilitu or wear resistance may be specified by agreement between supplier and purchaser.
Microstructure
1.The microstructure shall consist of flake graphite in a matrix of ferrite or pearlite or mixtures thereof.
2.As graphite size and shape somewhat affect hardness-strength ratio and other properties,the type size and distribution of the graphite flakes at a designated location on the casting may be specifed by agreement between supplier and purchaser in accordance with Method A247.
General
1.Castings furnished to this specification shall be representative of good foundry pratice and shall conform to dimenisons and tolerances specified on the casting drawing.
2.Minor imperfections usually not associated with the structural function may occur in castings.These are often repairable but repairs shall be made noly where allowed by the purchaser and only by approved methods.
3.Additional casting requirements may be agreed upon by pruchaser and supplier.These should appear as product specifications on the casting or part drawing.
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