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Posted by John2005 on May 31, 2008, 9:15 pm
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Thanks for the feedback guys,
After reading your replies, I searched online for NAK55 and DH2F. I
will also check into the Viscount.
I read something about one of the grades in a "hi hard" condition of
45/48 RC, which would probably have a high compressive yield strength
in that hardness. At about what point in general would a pre-hard
steel be too hard to really machine effectively ?
Can you recommend any online sources or books that have compressive
yield strengths for these materials in their pre-hard state ? So far,
I have not found much. Can you recommend any sources of supply for
small prototype quantities ?
Thanks again guys,
John
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Posted by Black Dragon on May 31, 2008, 10:11 pm
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John2005 wrote:
> Thanks for the feedback guys,
> After reading your replies, I searched online for NAK55 and DH2F. I
> will also check into the Viscount.
> I read something about one of the grades in a "hi hard" condition of
> 45/48 RC, which would probably have a high compressive yield strength
> in that hardness. At about what point in general would a pre-hard
> steel be too hard to really machine effectively ?
> Can you recommend any online sources or books that have compressive
> yield strengths for these materials in their pre-hard state ? So far,
> I have not found much. Can you recommend any sources of supply for
> small prototype quantities ?
> Thanks again guys,
Without knowing what the application is, it's difficult to recommend the
best material.
These guys sell DH2F and Viscount 44, don't know about NAK 55.
http://sturdell.com
The online sources for the specs would be the manufactures of the steels.
The names mentioned are trade names specific to a particular manufacturer.
If not available online, it's certainly available from a supplier.
--
Black Dragon
Shouted Frosty the Snowman "Hooray!
I'm agog with excitement today!
And the reason of course,
A reliable source,
Said the snow blower's heading this way!"
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Posted by John R. Carroll on May 31, 2008, 10:52 pm
Please log in for more thread options John2005 wrote:
> Thanks for the feedback guys,
>
> After reading your replies, I searched online for NAK55 and DH2F. I
> will also check into the Viscount.
>
> I read something about one of the grades in a "hi hard" condition of
> 45/48 RC, which would probably have a high compressive yield strength
> in that hardness.
NAK has a grade this hard but you might also be refering to something known
as Super P-20.
Thyssen makes it.
>At about what point in general would a pre-hard
> steel be too hard to really machine effectively ?
Tooling for hard milling has come a long way over the years.
People are machining 60 RC D-2 these days from the start.
--
John R. Carroll
www.machiningsolution.com
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Posted by John R. Carroll on May 31, 2008, 10:49 pm
Please log in for more thread options Black Dragon wrote:
> John R. Carroll wrote:
>
>> Black Dragon wrote:
>>> John R. Carroll wrote:
>
>>>> John2005 wrote:
>>>>> Hi everyone,
>
>
> John, Viscount (pronounced vi-count) 44 is Rockwell C 42/46 off the
> shelf. The only heat treatment I've ever seen done to it is nitriding
> for wear resistance. It's more difficult to drill than NAK 55 and DH2F
> but other than that it's not a bad material to work with.
I built seat belt cover molds out of it in the 70's for Allied Chemical.
They tried to save a buck by having me requote the tools in Viscount instead
of the S-7 I'd originally wanted to use.
When that little window shut off in the center where the little latch
release mechanism ( the thingy with GM on it ) would start to flash a lot
they had to be welded. Guess what happened to those little cavities when we
put enough heat into them to get a good weld?
LOL
We converted a lot of cavities in the end to S-7 so I guess you're right.
It's not bad material at all <EG>
--
John R. Carroll
www.machiningsolution.com
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Posted by Black Dragon on May 31, 2008, 11:37 pm
Please log in for more thread options John R. Carroll wrote:
> Black Dragon wrote:
>> John R. Carroll wrote:
>>> Black Dragon wrote:
>>>> John R. Carroll wrote:
>>>>> John2005 wrote:
>>>>>> Hi everyone,
>> John, Viscount (pronounced vi-count) 44 is Rockwell C 42/46 off the
>> shelf. The only heat treatment I've ever seen done to it is nitriding
>> for wear resistance. It's more difficult to drill than NAK 55 and DH2F
>> but other than that it's not a bad material to work with.
> I built seat belt cover molds out of it in the 70's for Allied Chemical.
> They tried to save a buck by having me requote the tools in Viscount instead
> of the S-7 I'd originally wanted to use.
> When that little window shut off in the center where the little latch
> release mechanism ( the thingy with GM on it ) would start to flash a lot
> they had to be welded. Guess what happened to those little cavities when we
> put enough heat into them to get a good weld?
> LOL
> We converted a lot of cavities in the end to S-7 so I guess you're right.
> It's not bad material at all <EG>
Recently used some Viscount 44 for slides and cores in radiator tank molds
for Modine. H13 is the preferred material for tank molds as it can be
heat treated to a few points higher hardness (typically RC 46/50), but it
takes two days to treat (double temper) and lead times are tight so
Viscount 44 is an excellent substitute. Carburetor molds for Rochester
Products were made from it too. We use it quite often for cores, turns and
drills much nicer than thru hardened H13 core pins.
Yep. Viscount 44 is a terrible steel alright. I'd much rather machine
DH2F, it's a wee bit more forgiving. <g>
--
Black Dragon
Fornication, n.:
Term used by people who don't have anybody to screw with.
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