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Posted by Karl Townsend on May 4, 2008, 10:39 pm
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I'm making a couple small leaf springs. After a bit of searching, I've
settled on 1095 steel for my project. It needs to be heat treated for spring
properties, but I'm not finding info on tempering. The best page I've found
has a HUGE range for tempering.
http://www.suppliersonline.com/propertypages/1095.asp
Does anyone have information for a procedure to treat this for best spring
properties?
Karl
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Posted by Joseph Gwinn on May 4, 2008, 11:22 pm
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> I'm making a couple small leaf springs. After a bit of searching, I've
> settled on 1095 steel for my project. It needs to be heat treated for spring
> properties, but I'm not finding info on tempering. The best page I've found
> has a HUGE range for tempering.
> http://www.suppliersonline.com/propertypages/1095.asp
>
> Does anyone have information for a procedure to treat this for best spring
> properties?
Carbon steel springs are tempered blue.
Define "small".
The classic way to heat treat objects small enough to burn in the torch
flame is to put them on a larger piece of iron. which is heated to the
necessary temperature, and is then tipped so the parts fall directly
into the waiting oil or water quench bath.
Tempering is much the same, except no abrupt dump into fluid.
Joe Gwinn
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Posted by Karl Townsend on May 5, 2008, 7:46 am
Please log in for more thread options > Carbon steel springs are tempered blue.
I've seen this term. Doesn't mean anything to me. I have a heat treat oven.
So far, I know to heat to 1650 and quench in water. No clue on temper.
>
> Define "small".
The part is 0.187 X 0.5 X 4.0 inches
Karl
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Posted by David Billington on May 5, 2008, 9:21 am
Please log in for more thread options Karl Townsend wrote:
>> Carbon steel springs are tempered blue.
>>
>
> I've seen this term. Doesn't mean anything to me. I have a heat treat oven.
> So far, I know to heat to 1650 and quench in water. No clue on temper.
>
From Machinery's temper colour temperatures for plain carbon steel,
full blue 560F (293C), dark blue 570F (299C). IIRC a usual
recommendation is to hold the part at the tempering temperature for 1
hour per inch of thickness.
>
>> Define "small".
>>
>
> The part is 0.187 X 0.5 X 4.0 inches
>
> Karl
>
>
>
>
>
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Posted by Joseph Gwinn on May 5, 2008, 9:22 am
Please log in for more thread options
> > Carbon steel springs are tempered blue.
>
> I've seen this term. Doesn't mean anything to me. I have a heat treat oven.
> So far, I know to heat to 1650 and quench in water. No clue on temper.
>
> >
> > Define "small".
>
> The part is 0.187 X 0.5 X 4.0 inches
That can be done with a torch, with care. But it will be easier on a
larger hunk of iron.
What they mean by tempering to a color is that after heating to
incandescence and quenching, one cleans the black scale off a convenient
surface (or all surfaces) down to bare metal, and then reheats the metal
while watching the color of light reflected off a clean spot.
At something like 600 to 700 degrees F, the color will be a deep blue.
These colors are generated by optical interference in the oxide film
grown on the hot steel, and are a measure of the thickness of the oxide
film. The steel is not emitting visible light during tempering.
Tempering to straw color can be done in a domestic oven, as this
requires only 400 to 500 degrees F.
There is a good writeup in Machinery's Handbook.
Joe Gwinn
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> settled on 1095 steel for my project. It needs to be heat treated for spring
> properties, but I'm not finding info on tempering. The best page I've found
> has a HUGE range for tempering.
> http://www.suppliersonline.com/propertypages/1095.asp
>
> Does anyone have information for a procedure to treat this for best spring
> properties?