ASTM B240-2017 pdf free download
ASTM B240-2017 pdf free download.Standard Specification for Zinc and Zinc-Aluminum (ZA) Alloys in Ingot Form for Foundry and Die Castings
1. Scope
1.1 This specification covers commercial zinc and zinc- aluminum (ZA) alloys in ingot form for remelting for the manufacture of pressure die castings, foundry castings and continuous cast bar stock as designated and specified in Table 1. Seven alloy compositions are specified, designated as follows:1.2 Zinc alloys Z33524, Z33526, Z35532, Z46540, and Z35544 are used primarily for remelting in the manufacture of pressure die castings. Zinc-aluminum alloys Z35637, Z35632, and Z35842 are used for remelting in the manufacture of both foundry and pressure die castings. Castings made from these ingots are specified in Specification B86, Standard Specifica- tion for Zinc and Zinc-Aluminum Alloys for Foundry and Die Castings. 1.3 The values stated in inch-pound units are to be regarded as standard. No other units ofmeasurement are included in this standard. 1.4 Systems of nomenclature used to designate zinc and zinc-aluminum (ZA) alloys used for casting are described in Appendix X1. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to become familiar with all hazards including those identified in the appropriate Safety Data Sheet (SDS) for this product/material as provided by the manufacturer, to establish appropriate safety, health, and environmental practices, and determine the applicability ofregulatory limitations prior to use. 1.6 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.
3. Terminology
3.1 Terms shall be defined in accordance with Terminology B899. 3.2 Definitions ofTerms Specific to This Standard: 3.2.1 continuous casting, n—a casting technique in which a cast is continuously withdrawn through the bottom of the mold as it solidifies, so that its length is not determined by mold dimensions; used chiefly to produce semifinished mill products such as billets, blooms, ingots, slabs and tubes; also known as concast. 3.2.2 die casting, n—a casting process in which molten metal is injected under high velocity and pressure into a metal die and solidified, also a product produced by such a process. Alternately known as pressure die casting.
4. Ordering Information
4.1 Orders for ingot under this specification shall include information as specified in Specification B949.
5. Materials and Manufacturer
5.1 The material covered by this specification shall be of uniform quality and reasonably free from dross, adhering foreign matter, and surface oxide.
6. Chemical Requirements
6.1 The ingots shall conform to the requirements as to chemical composition prescribed in Table 1. Conformance shall be determined in accordance with Specification B949.
7. Ingot Sizes and Shapes
7.1 Zinc casting alloy ingots are typically supplied in ingot bundles weighing 1700 to 2400 lb. 7.2 Ingots and bundles vary in size and weight depending on the alloy and supplier. 7.2.1 Standard ingots have a nominal weight in the range of 17 to 24 lb. and are generally 24 to 26 in. long. 7.2.2 Margash bars or ingots come in two sizes with a nominal weight in the range of either 12 to 14 lb. or 20 to 24 lb. 7.3 Zinc casting alloy ingot may be ordered in jumbos or blocks, as specified in Specification B897. 7.4 Zinc casting alloy ingot may also be ordered in other shapes.
9. Methods for Chemical Analysis
9.1 The determination of chemical composition shall be made in accordance with Specification B949.9.2 In case of dispute, the results secured by an approved method (or combination of approved methods), or by a method agreed upon by both parties, shall be the basis of acceptance. 9.2.1 Approved methods include: Test Methods E536, ISO 3815–1, or ISO 3815–2. N OTE 1—Test Methods E536 is directly applicable, in an unmodified form, only to alloys 3, 5 and 7. ISO 3815–1 and ISO 3815–2 are generic methods applied to zinc and zinc alloys. Each of the methods may be modified and formatted for the alloy to be assayed. An experienced chemist, using suitable and/or traceable standards along with valid quality assurance techniques, will be able to perform and validate the methods and demonstrate acceptable precision and accuracy. 9.3 For purposes of determining compliance with specified composition limits as given in Table 1, an observed or calculated value shall be rounded to the nearest unit in the last right-hand place of figures shown in Table 1, in accordance with the rounding method of Practice E29.
