1.1 This specification covers castings of ferritic, pearlitic, tempered pearlitic, and tempered martensitic grades of malleable iron used in the products of the automotive and allied industries. Castings shall be heat treated to meet this s This specification covers standards for castings of ferritic, pearlitic, tempered pearlitic, and tempered martensitic grades of malleable iron used in automotive products and industries. Castings shall be heat treated and shall be of Grades M3210, M450