What’s up guys?!?!?! This is Michael with Michael Talks Metal wishing you a Happy New Years!!!! Here’s to a great 2023!!!! So let’s jump in. We are back for the 114th time to start a new series to reveal the mysteries and meanings behind the data on a metal producers certification for material, aka a material test report or an MTR.
In addition, below, you will find all the sections referenced in the video in order to view them here on this page. To see the entire Material Test Report click here.
First thing to mention is the alternate names that may appear on this type of document depending on the producing mill….. Test Report, Certificate of Test, Test Certificate, or just Certification to name the most common.
For our example today we are using a document from Republic Steel. In the top section we have details of a specific customer and mill order that are self explanatory and we can skip to the technical parts.
The primary identifier of this batch of alloy steel is its heat number. The heat number is assigned to the material as it is melted and refined by the producing mill. It may be a simple numerical sequence or it may contain information in its sequence… Each mill has its own scheme. It identifies a specific chemical composition and this identity will be maintained throughout production.
Next we have a section that describes the material …… alloy, dimensions, condition, and the applicable specifications and their revision level. Quite a bit of information here.
Chemical composition is shown in the next section.
The elements that are either required or restricted by the specifications the material is certified to are listed in this section.
This chemistry is taken from the melt during production and the numbers are the weight percent of the elements present.
In this example there is something listed here as DI POINT …… this is not an element; it is a calculation made from the chemical composition related to heat treatment under ideal conditions. the IDEAL DIAMETER. To avoid any confusion with ID for inside diameter we use DI for short
In this section, the mill is reporting the Reduction Ratio …. the amount of hot working the material has undergone.
The ratio is the cast cross section area to the final hot rolled bar cross section area. In this case, the cast size was 16.5 times as large as the hot rolled bar.
Next is a statement indicating that the grain size would be 5 or finer based solely on the presence of .020% or greater Aluminum in the melt. Based on the AL content we know it would be fine grain but we don’t know the actual grain size.. yet.
It looks like we are just about out of time for today, so we will pick up this discussion next time. Thank you so much for watching. This is Michael with Michael Talks Metal, again, Happy New Years and please remember to CHECK THE SPECS!!!!!!!!!!!!!!!!!!!!!! and don’t forget to visit our website www.michlinmetals.com for any more info you might need.
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