1、1. Scope1.1 This standard provides a system for designating unalloyed aluminum not made by a refining process and used primarily for remelting.1.2 Unalloyed wrought aluminum designations (10xx series with specified minimum aluminum and limits for natural impurities), are assigned and registered in a
2、ccordance with ANSI H35.1. 2. Unalloyed Aluminum Designation System 1 2.1 This system consists of four digit numerical designations prefixed by the letter P (Purity) and suffixed by a serial letter. The first two numerical digits, XX, indicate the two digits to the right of the decimal place in the
3、limit for maximum silicon, 0.XX. The last two numerical digits, YY, indicate the two digits to the right of the decimal place in the limit for maximum iron, 0.YY.2.1.1 Each basic unalloyed aluminum designation is identified by the letter A following the numerical designation, i.e., PXXYYA.2.1.2 Vari
4、ations of a basic unalloyed aluminum, i.e., having the same individual silicon and iron limits but having different individual limits for elements other than silicon and iron are identified by substituting a serial letter in place of the letter A. The serial letters are assigned in alphabetical sequ
5、ence starting with B but omitting I, O, and Q.ANSI H35.4-2017 Revision of H35.4-2006 (R2013)designation system for unalloyed aluminum American National Standard Approved May 12, 2017 Secretariat: The Aluminum Association, Inc. 1 Chemical composition limits and designations conforming to this standar
6、d may be registered with the Aluminum Association provided (a) the unalloyed aluminum is offered for sale currently and shall have been sold within the 12 months immediately preceding the date of registration request, in both cases in commercial quantities, (b) the complete chemical composition limi
7、ts are registered, (c) the composition is different from that of any other unalloyed aluminum for which a designation already has been assigned. 2 The aluminum content for unalloyed aluminum not made by a refining process is the difference between 100.00 percent and the sum of all the other analyzed
8、 metallic elements together with silicon present in the amounts of 0.010 percent or more each, expressed to the second decimal before determining the sum. For unalloyed aluminum not made by a refining process, when the specified maximum limit is 0.XX, an observed value or a calculated value greater
9、than 0.005 but less than 0.010% is rounded off and shown as “less than 0.01.” 3 Standard limits for impurities are expressed in the following sequence: Silicon; Iron; Zinc; Gallium; Vanadium (See Note 1); Other (See Note 2) Elements, Each; Other Elements, Total; Aluminum (See Note 3). Note 1 - Addit
10、ional specified elements having limits are inserted in alphabetical order by their chemical symbols between Vanadium and Other Elements, Each or are specified in footnotes. Note 2 - “Others” includes listed elements for which no specific limit is shown as well as unlisted metallic elements. “Total“
11、is the sum of those “Others“ metallic elements 0.010 or more each, expressed to the second decimal before determining the sum. The producer may analyze samples for trace elements not specified in the registration or specification. However, such analysis is not required and may not cover all metallic
12、 “Others” elements. Should any analysis by the producer or the purchaser establish that an “Others” element exceeds the limit of “Each” or that the aggregate of several “Others” elements exceeds the limit of “Total”, the material shall be considered non-conforming. Note 3 - Aluminum is specified as
13、“Remainder” for unalloyed aluminum. An American National Standard implies a consensus of those substantially concerned with its scope and provisions. An American National Standard is intended as a guide to aid the manufacturer, the consumer, and the general public. The existence of an American Natio
14、nal Standard does not in any respect preclude anyone, whether he has approved the standard or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the standard. American National Standards are subject to periodic review and users are cautioned
15、 to obtained the latest editions. The American National Standards Institute does not develop standards and will in no circumstances give an interpretation of any American National Standard. Moreover, no person shall have the right or authority to issue an interpretation of an American National Stand
16、ard in the name of the American National Standards Institute. CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of the American National Standards Institute require that action be taken to reaffirm, revise, or withdraw this standard no later than
17、 five years from the date of approval. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute.2.2 Maximum limits for the following, expressed as a mulitple of 0.01 percent are registered for each desi
18、gnation: Silicon; Iron; Other; Elements, Each; Other Elements, Total. Aluminum is specified as a remainder for unalloyed aluminum2 . Maximum limits for individual elements other than silicon and iron may be registered 3 . Copyright 2017, The Aluminum Association, Inc. All rights reserved. Unauthorized reproduction, distribution, creation of derivative works, and/or sale of this work is prohibited.
