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pain in the butt
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Join Date: Nov 2007
Location: Air Force Base
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Investment Casting mil spec change

02/20/2008 4:30 PM

Is ASTM A743, Grade CF-20 the same as MIL-S-81591 Composition IC 302 or a suitable substitute?
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Pathfinder Tags: ASTM A743 CF-20 IC 302 Investment Casting MIL-S-81591
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engabdou1
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Egypt - Member - New Member Engineering Fields - Mechanical Engineering - New Member

Join Date: Jun 2007
Location: Egypt
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#1

Re: Investment Casting mil spec change

02/21/2008 1:45 AM

Ithink it's a suitable substitute

ASTM A743, Grade CF-20

MIL-S-81591 Composition IC 303

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majordud
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#2

Re: Investment Casting mil spec change

02/21/2008 7:31 AM

CF-20 & IC 302 are effectively the same material (various specifications apply) - but not the 303 as referenced by the other responder. 303 is intentionally resulphurized (or with selenium) for improved machinability. For improved corrosion resistance, try the lower carbon CF-8 (304ss), or even better CF-3 (304L).
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pain in the butt
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#3
In reply to #2

Re: Investment Casting mil spec change

02/21/2008 9:27 AM

thanks!
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