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ASTM A48 Standard for Gray Iron Castings dry, because the A, B, C, S are just the requirements to the test bar. For example, ASTM A48 Class 20 will be detailed enough for iron foundries, it means the min. tensile strength of gray iron <span>castings must be higher than 20 ksi (138 Mpa). ASTM A48 Class 20: Min. Tensile Strength 20 ksi (138 Mpa) ASTM A48 Class 25: Min. Tensile Strength 25 ksi (172 Mpa) ASTM A48 Class 30: Min. Tensile Strength 30 ksi (207 Mpa)
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