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Letter 41053
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Bill Reynolds |
Good afternoon:
I've never heard of 316HQ, but I have heard of 302HQ, which has a
small amount of copper added for improved cold formability. Are you
sure that's not the grade you are looking for?
Steve Bizub
- St Louis, MO
After reading Steve's post, I googled 316HQ. 19 hits. The only one
in English is the original posting on this thread.
The grade obviously does exist, and one summary suggests that it has
copper and selenium as its main claim to fame.
A Chinese site refers to Custom Flo 316HQ and quotes the chemistry as
0.03 C max (which is strange in itself, as in that context "H"
usually denotes closer to 0.08 C), 1.0 Si max, 2.0 Mn max, 17.0-19.0
Cr, 8.00-10.0 Ni, 3.00-4.00 Cu and makes no mention of Se.
Live and learn!!
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Bill Reynolds |
Interesting information...I wonder if its not a discontinued grade
from Carpenter Technology.
Forgot to mention earlier that HQ refers to heading quality. This is
a special grade of stainless rod or wire for cold heading
applications.
Steve Bizub
- St Louis, MO
Ha! The bits of information start to mesh! Letter suffixes to AISI
grades usually only refer to variations or tighter ranges on the
chemistry spec.
Examples are 316H (carbon high); 316L (carbon low); 316N (significant
nitrogen content); 316LN (carbon low plus a significant nitrogen
content). And so on for the many dozens of AISI grades of plain
carbon and low alloy steels as well as high alloys such as
stainless.
When HQ is used in the sense that Steve explains, referring to
mechanical properties although the AISI numbers only specify
chemistry, it starts a potentially messy trend, fraught with risk of
misinterpretation.
However, the original poster of this question at least now has his
explanation!
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Bill Reynolds |

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