Quality Standard---GG20 1. Material Requirements 1.1 Must meet Grade GG20 for gray iron castings. 1.2 Chemical Composition (Percent) * Total Carbon: 3.0 - 3.50% * Silicon: 1.90 - 2.30% * Manganese: 0.60 - 0.90% * Phosphorus: 0.12% Max. * Sulfur: 0.10% Max. 1.3 Microstructure: 1.3.1 Graphite Structure- Predominantly type A, size 3-5. 1.3.2 Matrix Pearlitic with max. 15 ferrite Free from chill 1.4 Physical Properties: 1.4.1 Tensile Strength- Min. 200 N/mm 1.4.2 Brinell Hardness- 190 - 230 ( 10 mm ball, 3,000 kg load)
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