ASTM A48/A48M-03 (R2021) pdf free download.Standard Specification for Gray lron Castings.
1.1 This specification 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.
1 .2 Castings produced to this specification are graded on the basis of minimum tensile strength obtained in special test coupons designed to standardize cooling rate. The tensile strength developed in certain casting sections may vary from test coupon values (see Xl.2).
1.3 The values stated in either SI units or inch-pound units are to he regarded separately as standard. The values stated in each system may not he exact equivalents: therefore, each system shall he used independently of the other. Combining values from the two systems may result in nonconformance with the standard.
3. Terminology
3. 1 Definitions:
3.1.1 Definitions for many terms common to gray iron castings are found in Terminology A644.
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 (Tables 1 and 2). Each class is designated by a number followed by a letter. The nunther 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 A48, Class 30B. Gray Iron Castings, ASTM Specification A48, 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. I and Tables 1 and 2),
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 3),
5.1.4 The tension test specimen (B or C) to he machined from test bar C (see 13.3, Table 4, and Fig. I),
5.1.5 The tension test specimen to be machined from test bar S (see 13.4, Table 4. 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 15.1),
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 special requirements as to hardness, chemical composition, microstructure, pressure tightness. radiographic soundness, dimensions, surface finish, and so forth.
7. Tensile Requirements
7.1 Test bars representing castings conforming to this specification shall meet the requirements for tensile strength as described in Tables 1 and 2.
8. Dimensional Requirements
8.1 The castings shall conform to the dimensions or drawings furnished by the purchaser or, if there are no drawings. to the dimensions predicted by the pattern equipment supplied by the purchaser.ASTM A48/A48M pdf download.