Heat Analysis Requirements

[hvdesai1284]

Dear All,
We all know that ASTM 105 & ASTM A 234 have their own General requirements given in ASTM A 960, A 961 etc. which should also be addressed along with original Product requirements.

Now as per A 960/ 961 : Heat Analysis : "An Analysis of each heat of steel shall be made by the manufacturer to determine the percentage of those element specified in the individual product specification. If secondary melting process are employed, the heat analysis shall be obtained from one re-melted ingot of each Primary melt. The chemical Analysis thus determined shall conform to the requirements of the individual product specification. Note that Product Analysis(Check analysis) tolerances are not to be applied to the heat analysis requirements."
&
Product Analysis: As per A 960/961 "If a Product Analysis is performed, it shall be in accordance with Test Methods, Practices & Terminology A 751"

I have following questions for the above.

1. I want to know what exactly A 960/961 wants to say for "Black Highlighted-Underlined Part of "Heat Analysis". What is Primary & Secondary Melting Processes???
2. I have TCs of ASTM A 105 & ASTM A 234, which are only having Product Analysis. They don't have "Heat Analysis" Can we say that it is totally conforming to A 105 & A234?? As far as I can understand "Heat Analysis" is Mandatory for materials having this both Grades, "Product Analysis" is optional. m I right????

 

[mrfailure]

From a test lab point of view:

The tolerances do apply to the finished product. From a test lab point of view, we will apply tolerances for product analysis in our certs if the sample meets product analysis, but not heat analysis, requirements. We will also note application of product analysis limits for that specific case.

 

[EdStainless]

For example, if a heat was first melted in an electric arc furnace (primary) then each slab was remelted individually in a Vacuum arc furnace (secondary).
IF they provide only the product analysis (check) then I would expect it to fall within the limits of the spec, WITHOUT the additional check tolerances added. If this is the case then I would say that it complies.
It is odd to not have a melt or heat analysis. Are these coming to you from the producer? I am guessing not. Normally you get heat chem but not product (even though everyone runs one).
We require that both chemistries be listed, and if the material is coming from an intermediary we also require the original mill certs from the melter.

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P.E. Metallurgy, Plymouth Tube

 

[metengr]

Heat analysis in the referenced material specification SA 961 is only performed after primary or secondary melting by the steel manufacturer, and is used to ensure the product chemical composition requirements in the material specification can be met, in this case SA 105 or other.

Product analysis is performed by the steel manufacturer and/or the Purchaser or other to ensure compliance with the material specification, in this case SA 105 or other referenced material specification.