AA ANSI H35 3-1997 Designation system for aluminum hardeners.pdf

1、ANSI H35.3-1997 (R2013) Reaf rmation of H35.3-1997 1. Scope1.1 This standard provides a system for designat- ing aluminum hardeners used primarily for the addition of alloying or grain re ning elements or modi ers to aluminum alloy melts. 2. Alloy Designation System Q2.1 This system consists of four

2、 digit numerical designations pre xed by the letter H. The rst two digits identify the hardener alloy group by major alloying element W 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 signi cance. TAB

3、LE 1 Designations for Hardener Alloy Groups RMajor Alloying Designation Elements No.Other Elements (a) H20XXCu H21XX Hardener Ti, B H22XX Alloys Si H23XX Grouped by Mn H24XX Major Added Ni H25XX Elements Zr, V H26XX Other Than Two or more elements, H27XX Aluminum each over 9.5%Fe H28XXCr H29XX (a) M

4、ajor elements other than those listed. American National Standarddesignation system for aluminum hardeners Approved November 7, 2013 Secretariat: The Aluminum Association, Inc. QChemical composition limits and designations conforming to this standard may be registered with the Aluminum Association p

5、rovided (a) the hardener is offered for sale; (b) the complete chemical composition limits are registered; (c) the composition is signi cantly different from that of any other hardeners for which a numerical designation already has been assigned, where “signi cant” is de ned as: (i) A change of the

6、following 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 0.10 Over 0.30 thru 1.0 percent 0.15 Over 1.0 thru 2.0 percen

7、t 0.20 Over 2.0 thru 3.0 percent 0.30 Over 3.0 thru 4.0 percent 0.40 Over 4.0 thru 5.0 percent 0.50 Over 5.0 thru 6.0 percent 0.70 Over 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 ar

8、ithmetic mean 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 qu

9、alifying the hardener for inclusion in the system; and (e) the hardener must be produced speci cally for and regularly used as an alloying material in the production of aluminum and aluminum alloys. WFor codi cation purposes an alloying element is any element which is intentionally added. EA major e

10、lement is that element other than aluminum hav- ing the greatest nominal concentration. Should two or more major elements have equal nominal concentrations, that element appearing rst in the element limit sequence shall be used to determine designation grouping. When nominal concentration of two or

11、more elements 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 speci ed elements in alphabeti

12、cal order 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

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