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Letter 41053
316HQ stainless steel
[Taiwan]
June 8, 2006
Dear Sir/Madam
I am struggling with letters specifications stainless steel type
316HQ, what does "HQ" MEANS? and how many percent weight of copper is
contained? Which standard should I refer to?
By the way, I wish to apply a membership in order to be able to
use on air chat, so what can I do?
HENRY SU
STUDENT - TAINAN COUNTY, TAIWAN
Ed. note: For the chatroom please try Username: chat ,
Password: 5758
June 9, 2006
I believe there is no grade 316HQ. Perhaps it is a misreading of
316HC?
None of the variations on the 316 theme contains copper (except
perhaps occasionally as an accidental residual and unlikely to exceed
about 0.2%).
Bill Reynolds
Tasmet Systems - Melbourne, Victoria, Australia
June 12, 2006
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
June 16, 2006
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!!
Bill Reynolds
Tasmet Systems - Melbourne, Victoria, Australia
June 16, 2006
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
June 20, 2006
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!
Bill Reynolds
Tasmet Systems - Melbourne, Victoria, Australia
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