API 6A: QTC (ER Method)
API 6A: QTC (ER Method)
(OP)
In accordance with API 6A, the size of a TC or a QTC for a part shall be determined using the ER method give in 5.7.2. What is exactly the method ER? Could you give me an example?
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RE: API 6A: QTC (ER Method)
If you review API 6A they even provide a definition under Terms and Conditions
3.1.41
equivalent round ER
standard for comparing various shaped sections to round bars, in determining the response to hardening characteristics when heat-treating low alloy and martensitic corrosion-resistant steel
The reason for the above is that hardenability curves during quenching, like Jominy Curves were performed using round bars as a standard.
RE: API 6A: QTC (ER Method)
Different shapes will have different ER and this will come handy during QTC.
ER calculation ---> See the diagram in Chapter 5.6.2 (a), (b) and (c)
Thanks,
Jeffrey