Microhardness conversion 17-7PH
Microhardness conversion 17-7PH
(OP)
Is there a special conversion for microhardness of 17-7PH to macrohardness that deviates from ASTM E140?
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Microhardness conversion 17-7PH
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RE: Microhardness conversion 17-7PH
Why are you trying to convert?
What is the strength level?
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Plymouth Tube
RE: Microhardness conversion 17-7PH
RE: Microhardness conversion 17-7PH
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Plymouth Tube
RE: Microhardness conversion 17-7PH
Aaron Tanzer
www.lehightesting.com
RE: Microhardness conversion 17-7PH
Thanks for your help.
RE: Microhardness conversion 17-7PH
I am wary of using E140 under the best of conditions, and always insert such verbiage.
RE: Microhardness conversion 17-7PH
We have been known to generate our own unofficial conversions in house.
However missing UTS is another issue.
How low were you?
this is RH950 right? are you sure that the cooling was done right? Fast enough, cold enough, long enough?
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Plymouth Tube
RE: Microhardness conversion 17-7PH
The parts are too thin for superficial (4mils). We got 206ksi UTS.
Yes RH 950. We followed the spec procedure and refrigerated for the prescribed time. Tensile was subsize, which might have been the problem. Coupon was 4X1. I requested an 8 X 1. Yeah, thought about doing an inhouse correlation. I just wish I could do it for these parts. I am not sure how much affect the chemistry will have on that correlation. The correlation might deviate considerably from the correlation from heat to heat given the same heat treatment. I'll probably build one, but it will take a few different heats of material to see whether I can get a consistent correlation.
thanks.
RE: Microhardness conversion 17-7PH
rp
RE: Microhardness conversion 17-7PH
When you say coupon was 4x1, do you mean that a rectangular section was tension tested, and not a standard tensile specimen (dogbone)? The standard subsize section in ASTM E8 allows for a 4 inch overall length, width of the reduced section equal to 0.25 inch, and gage length equal to 1 inch.
RE: Microhardness conversion 17-7PH
I meant raw stock dimensions. Tested a dogbone, but the blank it was cut from was 4X1.