FROM METALCASTINGDESIGN.COM
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BLOG ROLL
Mag-Nanimous Decision
Magnesium is an expensive material for North American designers to specify. But the U.S. International Trade Commission (ITC) could change that. According to an article from the St. Louis Post-Dispatch, the ITC has voted to “conduct a full review of 5-year-old tariffs im- posed on imported magnesium.” Nothing has been decided by ITC yet, but this could be the fi rst step in helping magnesium gain a fi rm- er foothold in the metal component marketplace. That would mean good things for designers interested in light-weighting initiatives.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . POLL QUESTION
The May/June website question
asked: Has your company ever convert- ed a component to metalcasting from some other manufacturing process?
Yes No
82.4% 17.6%
This month’s question is available at
www.metalcastingdesign.com.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ONLINE ARTICLE
Developing Lead-Free Copper-Base Alloys For copper-based alloys to remain a
viable metalcasting option, lead is some- times added to improve machinability and ensure pressure tightness. However, lead has been linked to a variety of ad- verse health concerns. In response to a need to reduce the
amount of lead in drinking water applica- tions, an alloy development program was begun. The most common red brass, UNS Alloy C83600, contains 85% copper and 5% each of tin, lead and zinc. The next most common is UNS Alloy C84400, a semi-red brass. It contains 81% copper, 3% tin, 7% lead and 9% zinc. These two alloys are traditionally sand cast. UNS Alloy C85800 is a standard yellow brass for permanent mold casting, containing 31-41% zinc and 1.5% each of lead and tin, with the remainder being copper. The lead replacement choices for these
alloys were narrowed to bismuth and selenium. The result was a family of non- leaded bismuth- and selenium-containing brass casting alloys called EnviroBrass alloys (earlier known as SeBiLOYs). En-
viroBrass I and II (C89510 and C89520) were developed to replace C83600 leaded red brass and C84400 semi-red brass. EnviroBrass III (C89550) is a substitute for C85800 leaded yellow brass.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ONLINE RESOURCES
Wherever you fi nd the cast metal “at” sign (right), reference the given website for more information.
JULY/AUGUST 2010
Navistar’s Balancing Act (p. 22): Hear an audiocast with an executive from truck maker Navistar.
From RP to AM (p.34): Find more information on additive manufacturing from industry watchdog Wohler’s Associates.
Walla Walla Foundry: Puppet Masters (p. 38): Read an article on how investment casting can be used in commercial applications.
METAL CASTING DESIGN & PURCHASING 3
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60