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The castings shall have a carbon equivalent of 3.8 to 4.5 inclusive.
4. Mechanical properties
4.1 The iron represented by test coupons shall conform to tensile requirements prescribed in Table 1.
4.2 The yield strength prescribed in Table 1 may be deter-mined by any of the approved procedures described in 4.3 of Test Methods E 8.
4.3 The Brinell hardness of the material shall be a minimum of 201 HB. Hardness tests shall be conducted in accordance with Test Method E 10, using a 3000-kgf load. The test may be made on either the casting or on a test coupon representing the casting.
5. Workmanship, finish and appearance
The castings shall conform to the dimensions on the drawings furnished by the purchaser, or if no drawing has been provided, to the dimensions predicated by the pattern supplied by the purchaser. Surfaces of the castings shall be free of adhering sand, Runners, risers, fins and other extraneous metal shall be removed.
Table 1 Tensile requirements
Castings made to this specification that leak on subsequent hydrostatic testing may be repaired by using threaded plugs provided the following requirements are met. No welding or brazing shall be permitted.