ASTM A48/A48M-00 pdf free.Standard Specification for Gray Iron Castings.
ASTM A48/A48M covers gray iron castings intended for general engineering use where tensile strength is a major consideration. Castings are classified on the basis of the tensile strength of the iron in separately cast test bars.
1.1.1 This specification subordinates chemical composition to tensile strength.
4. Classification
4.1 Castings ordered and produced in accordance with this specification are classified into a number of grades based on the properties of separately cast test bars (Table 1). Each class is designated by a number followed by a letter. The number indicates the minimum tensile strength of the separately cast test bar, and the letter indicates the size of the test bar. Examples of proper designations are as follows:
Gray Iron Castings, ASTM Specification A 48, Class 30B.
Gray Iron Castings, ASTM Specification A 48, Class 40C.
5. Ordering Information
5.1 Orders for material to this specification shall include the following information
5.1.1 ASTM designation number and year of issue.
5.1. 2 Class of iron required (see 4.1 and Table 1)，
5.1. 3 The size of the separately cast test bar(letter classification-A, B, C, or S)that best represents the thickness of the controlling section of the casting(see Table 2)
5.1.4 The tension test specimen (B or C)to be machined from test bar C (see 13.3, Table 3, and Fig. 1)
5.l. 5 The tension test specimen to be machined from test bar S(see 13.4, Table 3, and Fig. 1)，
5.1.6 Lot size(see Section 10)，
5.1.7 Special requirements(see Section 6)
5.1.8 Saving tested specimens or unbroken test bars (see 5.1),and
5.1.9 Special preparation for delivery (see Section 19)
6. Special Requirements
6.1 When agreed upon in writing between the manufacturer and the purchaser, it may be necessary for the castings to meet ecial requirements as to hardness, chemical composition microstructure, pressure tightness, radiographic soundness. dimensions, surface finish, etc.
9 and Finish
9. I The surface of the casting shall be free of adhering sand, scale, cracks, and hot tears, as determined by visual examination.
9.2 No repairing by plugging or welding of any kind shall he permitted unless written permission is granted by the purchaser.
10. Sampling
10.1 A lot shall consist of one of the following:
10.1.1 All the metal poured from a single heating in a batch type melting furnace.
10. 1 .2 All the metal from two or more batch type melting furnaces poured into a single ladle or a single casting.
10.1.3 All the metal poured irom a Continuous melting furnace for a given period of time between changes in charge, processing conditions, or aim-for chemistry or 4 h, whichever is the shorter period.
10.1.3. 1 The purchaser may agree to extend the 4-h time period to 8 h if the manufacturer can demonstrate sufficient process control to warrant such an extension.