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SA105N Flanges - Fine Grain Practice 4
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Christine74
Mechanical
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EdStainless
Materials
I don't know where ASTM/ASME stand on this, but the AMS aerospace specs have all been updated to allow meeting fine grain by measuring or by chemistry. Considering that the measurement is actually of the 'prior austenite grain size' the chemistry is a more reliable indicator.
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P.E. Metallurgy, consulting work welcomed
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P.E. Metallurgy, consulting work welcomed
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Alberta has an information bulletin regarding the subject (see attached)
Documentation Required for Flanges Produced to Fine Grain Practice
It should be noted that since the SA-105 material specification does not provide a definition for ‘fine grain practice’, Figure UCS-66 General Note (e)(2) refers to SA-20 for its definition.
In order for SA-105 flange material to be acceptable for use as having been produced to fine grain practice, the requirements of SA-20 §8.3, ‘Fine Austenitic Grain Size’ must be met. It is not acceptable for the material test report or any separate correspondence or certificate issued by the material manufacturer to simply indicate that the material was produced to fine grain practice. The material test report issued by the material manufacturer is required to be marked with one of the following, to the satisfaction of the Authorized Inspector:
Indication of a McQuaid Ehn austenitic grain size number of 5 or more for the heat, as required by SA-20, §8.3.1
Indication of a total aluminum content of 0.020% or more by heat analysis, as required by SA-20, §8.3.2.1
Indication of an acid-soluble aluminum content of 0.015% or more by heat analysis, as required by SA-20, §8.3.2.2
Documentation Required for Flanges Produced to Fine Grain Practice
It should be noted that since the SA-105 material specification does not provide a definition for ‘fine grain practice’, Figure UCS-66 General Note (e)(2) refers to SA-20 for its definition.
In order for SA-105 flange material to be acceptable for use as having been produced to fine grain practice, the requirements of SA-20 §8.3, ‘Fine Austenitic Grain Size’ must be met. It is not acceptable for the material test report or any separate correspondence or certificate issued by the material manufacturer to simply indicate that the material was produced to fine grain practice. The material test report issued by the material manufacturer is required to be marked with one of the following, to the satisfaction of the Authorized Inspector:
Indication of a McQuaid Ehn austenitic grain size number of 5 or more for the heat, as required by SA-20, §8.3.1
Indication of a total aluminum content of 0.020% or more by heat analysis, as required by SA-20, §8.3.2.1
Indication of an acid-soluble aluminum content of 0.015% or more by heat analysis, as required by SA-20, §8.3.2.2
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ElCidCampeador
Mechanical
My AI, acc. to this problem, answered me as follows:
-For MDMT -18°C and warmer, if flanges are standard acc. to B16.5 or B16.47, UCS-66 (c)(1)(-b) applies, so as-forged condition, without grain issuee, is sufficient.
-For MDMT between -18°C and -29°C, fine-grain practice is required and yes, according to note (e)(2) you must refer to SA-20 and its conditions. "Fine grain practice" only written on MTR, without any indication about Al% or grain size is not sufficient.
Please notice that if A105, in any condition, has impact test certificied @ MDMT, any discussion here doesn't apply because you do not have to apply anymore UCS-66 exemption.
This is what my ASME inspector told me: actually this means that requirements of SA 20, for standard flanges, are indeed applicable only for MDMT between -18°C and -29°C (@ higher temperature, as forged condition is enough)
-For MDMT -18°C and warmer, if flanges are standard acc. to B16.5 or B16.47, UCS-66 (c)(1)(-b) applies, so as-forged condition, without grain issuee, is sufficient.
-For MDMT between -18°C and -29°C, fine-grain practice is required and yes, according to note (e)(2) you must refer to SA-20 and its conditions. "Fine grain practice" only written on MTR, without any indication about Al% or grain size is not sufficient.
Please notice that if A105, in any condition, has impact test certificied @ MDMT, any discussion here doesn't apply because you do not have to apply anymore UCS-66 exemption.
This is what my ASME inspector told me: actually this means that requirements of SA 20, for standard flanges, are indeed applicable only for MDMT between -18°C and -29°C (@ higher temperature, as forged condition is enough)
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