Maximum content of an element in material
2

Question

Maximum content of an element in material

lesnar (Mechanical)

(OP)

7 May 17 15:15

Hi,

This is my first post here.

If an ASTM standard material specifies max content of an element (say 0.5% of molybdenum), then can the content of that element in the material be accepted as zero? Or is it mandatory for some percentage of that element to be present in the material?

metengr (Materials) · Answer 1 · 2017-05-07 18:21:09

In other words, can an element with a maximum specified limit and no minimum limit not be present? The reply is yes.

lesnar (Mechanical) · Answer 2 · 2017-05-08 05:22:13

RE: Maximum content of an element in material

lesnar (Mechanical)

(OP)

8 May 17 05:22

Thank you metengr, that answers my question.

lesnar (Mechanical) · Answer 3 · 2017-05-08 14:42:41

metengr, I have one more question.
The material specification doesn't say anything about a element (e.g. Nitrogen), but the received MTC for that material has some percentage of Nitrogen.
Is it still acceptable?

EdStainless (Materials) · Answer 4 · 2017-05-08 14:54:42

lesnar,
You can look this in a bit wider scope also.
I suggest that you read A751.

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P.E. Metallurgy, Plymouth Tube

metengr (Materials) · Answer 5 · 2017-05-08 23:20:07

Yes it is acceptable. Additional elements can be reported for information purposes if they are not specified by limits imposed by the material specification.

EdStainless (Materials) · Answer 6 · 2017-05-09 00:50:14

As long as the added element does not actually qualify it as another alloy and it has no significant impact on properties.
You can add unspecified elements for processing reasons, but if they change the grade or properties it is not allowed.

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P.E. Metallurgy, Plymouth Tube

lesnar (Mechanical) · Answer 7 · 2017-05-10 07:54:45

Thank you metengr and EdStainless for your replies.

I checked the minimum tensile / yield strengths and elongations of the supplied material (one with additional elements) and it meets the requirements of the material specification.

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Maximum content of an element in material
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