Re: [MW:23040] Heat Analysis Requirements

Product analysis is a responsibility of manufacturer of the parts, who has access to the billet which parts made from (by forging, rolling, welding or some times re-casting). 

If a manufacturer uses a process without any secondary casting to produce a part (forging, rolling, ...) then, the chemical analysis from the initial billet uses for evaluation of heat analysis. 

If he uses process\processes which include remelting and casting for producing parts, then the analysis should be held after this casting process and assumes as heat analysis.

You as a user of such parts should evaluate the conformance of that part with related standard by testing it according to that standard, which one may be chemical analysis. Such chemical analysis from final product is named as product analysis.

Please note that the product may pass some stages between heat analysis and product analysis (machining, blasting, heat treatment, some nondestructive tests, coating or painting & ... but never casting).

Regards

On Tue, May 26, 2015 at 3:09 PM, hard <hvdesai1284@gmail.com> wrote:

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: 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????

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