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Chemical Requirement Tables in Specs

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Gorpomon

Gorpomon

Mechanical
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I have a few quick questions concerning the chemical requirements tables in ASTM specs.

1. What do the "..." portions mean. Does that mean there is no max/min/range for that chemical element? Does it mean that the material can't have any of that element in it?

2. What if a material has elements not called out in the spec at all. Can the material be certified to a spec if for instance it has Copper in it, but Copper is not even mentioned in the spec its trying to meet?

3. Is there any ASTM guide to reading specs? I did a search for one and could not find anything.

Thanks everyone!
 
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1. When there is an ellipsis, that means there is no requirement. The sample can have any concentration and it does not cause a nonconformance.

2. Yes, you can have presence of elements not identified in the standard and it does not cause a nonconformance.

3. None that I know of.
 
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2. If they have added enough of an element to actually make it another grade then it isn't allowed.
3. There are guides in ASTM. I'll have to ask where to find it.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube
 
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Gorpomon, if you review the referenced general requirements spec for the product form, i.e. A-20 for PV plate, you will find such things as tolerances on composition and sizes, basic processing and so forth.

These will govern things not listed in the product spec.

Regards,

Mike
 
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Tables used for data compilation of required chemical or mechanical property requirements in Codes and Standards, will show ... for requirements not applicable. This is common nomenclature.

For example look at any ASTM specification that contains tables listing mechanical property or chemical composition requirements, values not listed are shown as ... because either elements stated or mechanical property test values do not apply.
 
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Most of the ASTM specs I look at say this right at the beginning of the table:

Where ". . ." appears in this table, there is no requirement.
Click to expand...

Hg

Eng-Tips policies: faq731-376
 
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