The calculation method (hardenability) described in the ASTM A255 is applicable only to a range of chemical composition. Nickel max is 1,50. It is not applicable for 4340. Someone knows how can I calculate hardenability for this steel (4340)?
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?