MODERN CASTING .COM
SOCIAL MEDIA DISCUSSION Test Bar Tensile Strength
On the Foundry and Diecaster Network on LinkedIn, a member asked, “I’m looking for some help with test bars passing tensile strength. Chemistry is good and the cooling time has not changed but it’s a hit or miss on tensile. Any ideas? We use 30-class iron iso- cure test molds.” Below are excerpts of some of the discussion points:
“A few generic suggestions: grain size, inclusions and dissolved gases have a large effect on the mechani- cal properties of test bars. Look at the thermal history of the casting and test bars. The test bar machining and accuracy of the testing machine also should be verifi ed.”—Arun R.
“We also cast class-30 gray iron in coldbox molds, but break our test bars out ten minutes after pouring.
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63.1% MITT ROMNEY 27.3% BARACK OBAMA 9.6% NEITHER
While foreign-based companies could lose a few “made-in-America” points, since their headquarters and many R&D establishments are not based in the U.S., many of the manufacturing and casting jobs are based here and that puts a lot of Americans to work. — S. Wetzel, Senior Editor
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November 2012 MODERN CASTING | 3
That gives us the same approximate Brinell Hardness Number (BHN) as our castings when we check the end of the test bar. I think that 8-12 hours in the mold allows the bars to anneal to below class-30.”—Michael W.
A bar, B bar or C bar? Is gating per the American Society for Testing and Materials (ASTM)? If chemistry is “good” does that mean not varying (CE and tramp elements) check your innoculation, assume induction melt and not cupola. Do you take BHN on end of the test bar, and how repeat-
able is that?—Trevor S.
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Editor’s Note: MODERN CASTING does not necessarily endorse the views expressed in the discussion.
BLOG ROLL Made in Bodine
Reading the St. Louis Post-Dispatch’s article on Bodine Aluminum’s 100th anniversary reminded me of my visit to the aluminum casting facility in Troy, Mo., a few years ago.
Like the story highlights, one of my big- gest impressions of the plant was its open, organized and informed culture on the shop fl oor. The place was clean and uncluttered. Plant statistics and performance charts were prominently displayed and updated. It was my fi rst real look at a true, lean metalcasting facility, thanks largely to its connection with Toyota. And I was impressed.
The visit also drove home a point many consumers still miss. Toyota is a Japanese company, but many of its cars on the road in the U.S. were produced domestically.
Cars.com’s list of the 10 most America-made cars includes three Toyota models (the Camry, Sienna, and Tundra) and two Honda models (the Accord and Pilot), along with the Ford F-150, Chevy Tra- verse, Jeep Liberty, GMC Acadia and Buick Enclave.
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