EN 1559-2 chemical composition explanation 1

[Dalinus]

Hello,

Would there be anyone to help me understand section 7.2.1 Chemical composition from EN 1559-2?

I have national version of that standard so I apologize for my reverse translating to English.
Or if there would be someone to paste english(or german) version of that section?

Text
"Acceptable diferences between specified melt anylysis and control analysis of test block are shown in table 1."


Does the section mean:

1) acceptable diferences in chemistry between chemical composition of melt sample and chemical composition of casting (for example melt smaple Mn 1.50%, casting 1.55%)

or

2) acceptable diferences in chemistry between chemical composition of melt sample and chemical composition from material standard (for example melt smaple Mn 1.50%, material standard 1.25-1.45%).

Or is there another explanation?

Thanks in advance

Dalin

 

[arunmrao]

The difference that you notice are permissible deviations between melt analysis (sample taken from the furnace melt) and the product analysis ( sample taken from test bar or casting). Hope this clarifies the confusion.



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[TVP]

arunmrao is correct, this is often referred to as the heat/melt analysis or the product analysis. The heat analysis is from the molten metal in a furnace/ladle, which is usually on the order of many tonnes of metal. The product analysis is for a very small part on the order of grams or kilograms.

 

[redpicker]

The "melt analysis" must meet the "Specified Melt Analysis".
For example, if the material specification is Mn 1.25-1.45, then the melt analysis must be in this range.

The control analysis of the test block (product analysis) must meet the material specification, but there is often an added tolerance applied to the specified analysis (apparently in Table 1) when verifying to conformance to the sepcification.
For example, if Table 1 shows Mn +/- 0.10, then the product analysis of the test coupon would have to be in the range 1.15-1.55.

I do not have a copy of the standard, so I am just guessing at what it actually says, but this is typical.

rp

 

[arunmrao]

I am providing the ASTM standard reference as I am more familiar with it.

ASTM A 703 M -06
Standard Specification for
Steel Castings, General Requirements, for Pressure- Containing Parts1


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( read somewhere on the internet)

 

[EdStainless]

Sometimes the product analysis is referred to as a 'check'.
The additional allowance is in recognition of the fact that the melt chemistry is a very small sample for a large heat.
I have come across many customer specifications over the years that prohibit the use of the additional tolerance. So read carefully.

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[Dalinus]

Thank you all for your input.

That A703 reference was great. It is actually more explaining than EN standard.

Dalin