ASTM A703 Product analysis tolerance
ASTM A703 Product analysis tolerance
(OP)
Dear Sirs,
My reported Aluminium level was 0.032% and we checked from the chemical specimen which was poured from the ladle with spectrometer.
My customer requirement is 0.04% max. Its with in the required limit and we sent the casting.
But my customer was checked the Aluminium level on the casting with portable spectrometer and observed Aluminium value is 0.052% and he is not ready to accept the casting.
Can I do anything with ASTM A703 tolerance calculations.
Please guide me.
My reported Aluminium level was 0.032% and we checked from the chemical specimen which was poured from the ladle with spectrometer.
My customer requirement is 0.04% max. Its with in the required limit and we sent the casting.
But my customer was checked the Aluminium level on the casting with portable spectrometer and observed Aluminium value is 0.052% and he is not ready to accept the casting.
Can I do anything with ASTM A703 tolerance calculations.
Please guide me.





RE: ASTM A703 Product analysis tolerance
RE: ASTM A703 Product analysis tolerance
"Even,if you are a minority of one, truth is the truth."
Mahatma Gandhi.
RE: ASTM A703 Product analysis tolerance
Did you check any product samples?
I would send the original melt sample and a product sample to well accredited lab as my colleges suggest.
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P.E. Metallurgy, Plymouth Tube
RE: ASTM A703 Product analysis tolerance
RE: ASTM A703 Product analysis tolerance
Aluminium segregates to areas which solidify last so if it gets enough time there could be easily 0,010-0,020% difference to laddle sample (or even to sample taken from attached test block).
As the others said you have to take the sample from the casting from the same location the customer reported.
Customers which have the limit 0,040% Al often have bad experience with AlN cracks so I understand your customer concern.
RE: ASTM A703 Product analysis tolerance
Avoiding Aluminum Nitride Embrittlement in
Steel Castings for Valve Components V-Rep 84-1
"Even,if you are a minority of one, truth is the truth."
Mahatma Gandhi.
RE: ASTM A703 Product analysis tolerance
They are being unrealistic to expect you to rely on them for the final word on this.
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P.E. Metallurgy, Plymouth Tube
RE: ASTM A703 Product analysis tolerance
I would have your customer bring the part to a local third party lab where a sample can be removed for testing on a stationary OES.
RE: ASTM A703 Product analysis tolerance
I just stay away from portable OES or XRF . I prefer the classic wet analysis method, though this is a rarity now.
"Even,if you are a minority of one, truth is the truth."
Mahatma Gandhi.
RE: ASTM A703 Product analysis tolerance
Now, ASTM A703 is the general spec for castings. The product tolerance in that spec for aluminum at specified level is 0.8Al + 0.02; i.e. you can be 0.0232% above the 0.04 maximum or be within tolerance at values up to 0.0632%. I would note the product meets spec using the tolerance band.