1、ANSI H35.3-1997 (R2013)Reaffi rmation of H35.3-19971. Scope1.1 This standard provides a system for designat-ing aluminum hardeners used primarily for the addition of alloying or grain refi ning elements or modifi ers to aluminum alloy melts.2. Alloy Designation SystemQ2.1 This system consists of fou
2、r digit numerical designations prefi xed by the letter H. The fi rst two digits identify the hardener alloy group by major alloying elementW Eas shown in Table 1. The last two digits indicate the sequential registration of hardener alloys beginning with the number H2X00 and have no other signifi can
3、ce.TABLE 1Designations for Hardener Alloy GroupsRMajor Alloying Designation Elements No.Other Elements(a) H20XXCu H21XXHardener Ti, B H22XXAlloys Si H23XXGrouped by Mn H24XXMajor Added Ni H25XXElements Zr, V H26XXOther Than Two or more elements, H27XXAluminum each over 9.5%Fe H28XXCr H29XX(a) Major
4、elements other than those listed.American National Standarddesignation systemfor aluminum hardenersApproved November 7, 2013 Secretariat: The Aluminum Association, Inc.QChemical composition limits and designations conforming to this standard may be registered with the Aluminum Association provided (
5、a) the hardener is offered for sale; (b) the complete chemical composition limits are registered; (c) the composition is signifi cantly different from that of any other hardeners for which a numerical designation already has been assigned, where “signifi cant” is defi ned as:(i) A change of the foll
6、owing amounts or more in arithmetic mean of the limits for each individual alloying element:Arithmetic Mean of Minimum Arithmetic Changes Limits for Alloying Need for New Alloy Elements in Original Alloy Issuance*Up thru 0.30 percent 0.10Over 0.30 thru 1.0 percent 0.15Over 1.0 thru 2.0 percent 0.20O
7、ver 2.0 thru 3.0 percent 0.30Over 3.0 thru 4.0 percent 0.40Over 4.0 thru 5.0 percent 0.50Over 5.0 thru 6.0 percent 0.70Over 6.0 1.00*Lesser amounts are considered too small to issue new alloy designation.(ii) Addition or deletion of one or more alloying elements with limits having an arithmetic mean
8、 of 0.20 percent or more.(iii) Change in limits for impurities for which the difference between arithmetic means (existing and proposed) is at least 0.10 percent.(d) the hardener contains more aluminum than attributable to impurity and the aluminum serves a useful function other than qualifying the
9、hardener for inclusion in the system; and (e) the hardener must be produced specifi cally for and regularly used as an alloying material in the production of aluminum and aluminum alloys.WFor codifi cation purposes an alloying element is any element which is intentionally added.EA major element is t
10、hat element other than aluminum hav-ing the greatest nominal concentration. Should two or more major elements have equal nominal concentrations, that element appearing fi rst in the element limit sequence shall be used to determine designation grouping. When nominal concentration of two or more elem
11、ents are each greater than 9.5%, such alloys are assigned to the 27XX group.RStandard limits for alloying elements and impurities are arranged in the following sequence: Silicon; Iron; Copper; Manganese; Chromium; Nickel; Titanium; Boron; Vanadium; Additional specifi ed elements in alphabetical orde
12、r of their chemical symbols; Other elements, Each; Other elements, Total; Aluminum (remainder).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,
13、 and the general public. The existence of an American National 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 Stand
14、ards are subject to periodic review and users are cautioned 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 authorit
15、y to issue an interpretation of an American National Standard in the name of the American National Standard.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 reaffi rm, revise, or withdraw this standard no later than fi ve 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.
