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ASTM A823-99(R2019) pdf free download

ASTM A823-99(R2019) pdf free download.Standard Specification for Statically Cast Permanent Mold Gray Iron Castings
1. Scope
1.1 This specification covers gray iron castings that are statically cast in permanent molds. 1.2 No precise quantitative relationship can be stated be- tween the properties ofthe iron in various locations ofthe same casting or between the properties ofa casting and those ofa test specimen cast from the same iron (see Appendix X1). 1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.4 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
4. Classification
4.1 Castings ordered and produced under this specification are classified into a number of grades based on the properties ofseparately cast test bars. The test bar shall be selected on the basis of the controlling section size of the casting (see 9.1 and 9.2 and Table 1). 4.2 Castings may be produced in the as-cast state provided the requirements of this standard in Table 1 are met. However, annealing or normalizing heat treatments are usual and cus- tomary and are a basis for classification. 4.3 The grades are designated A for annealed or N for normalized. This is followed by an S or a C to designate a solid or a cored casting, followed by anA, B, C, or S to designate the test bar to be poured with the castings. Examples of proper designations are as follows: Permanent Mold Castings, ASTM Specification A823, Grade N-SB Permanent Mold Castings, ASTM Specification A823, Grade A-CC
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 Grade of iron required (see Section 4 and Table 1). 5.1.3 The size of the separately cast test bar (letter classifi- cation A, B, C, or S) which best represents the thickness of the controlling section of the casting (see 4.1 and Table 2). 5.1.4 Location for Brinell Hardness determination (see 10.1.1). 5.1.5 Lot size (see Section 16). 5.1.6 Special requirements (see Section 17). 5.1.7 Special preparation for delivery (see Section 22). 5.1.8 Saving tested specimens or unbroken test bars (see 19.1.1).
9. Cast Test Bars
9.1 Test bars shall be separate castings poured from the same iron as the castings they represent and shall have dimensions as shown in Table 2. Allowance may be made for reasonable pattern draft within the tolerances shown in Table 2. Test bars A, B, and C are all standard test bars in the form of simple cylinders. Test bar S is special and is intended for use where the controlling section of the casting is over 2 in. 9.2 The test bar selected shall be based on the controlling section size of the casting. This shall be determined by the dimensions of the largest cylinder that will fit into the control- ling section of the casting with the additional requirement that the height of the cylinder must be at least equal to its diameter. 9.3 The test bars shall be cast in a permanent mold. The mold shall be of similar material, design, and construction as that used to make the production castings. The test bar permanent mold shall be preheated with three consecutive pours, after which, starting with the fourth pour, the bars can be used for the tension test. A suitable design for a mold is shown in Fig. 1. 9.4 By specific agreement between the manufacturer and the purchaser, test bars removed from the castings may be substi- tuted for separately cast test bars. The location from which the bars are taken shall be as agreed between the parties and indicated on the casting drawing or data base equivalent. 9.5 Where test specimens are to represent heat-treated castings, they shall accompany the castings in the same heat treat lot(s), or by agreement, be subjected to the same thermal cycle that the castings undergo.

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