Forging 4130 Prolongation piece for test
Forging 4130 Prolongation piece for test
(OP)
Hello,
I would like to know if anyone has experiences in cutting a prolongation for 4130 forging before or after the final heat treatment.
Supplier proposes to me to cut before the final heat treatment the prolongation and put everything in the same batch for the heat treatment.
I have been told from supplier that, depends on thickness, cut after the final heat treatment can downgrade the material properties (which sound logical) and cut after final heat treatment will not permit to use the entire prolongation piece.
Do you have any experiences on that? if yes, which is the best solution for you?
Thanks
Rgds
Giuseppe
I would like to know if anyone has experiences in cutting a prolongation for 4130 forging before or after the final heat treatment.
Supplier proposes to me to cut before the final heat treatment the prolongation and put everything in the same batch for the heat treatment.
I have been told from supplier that, depends on thickness, cut after the final heat treatment can downgrade the material properties (which sound logical) and cut after final heat treatment will not permit to use the entire prolongation piece.
Do you have any experiences on that? if yes, which is the best solution for you?
Thanks
Rgds
Giuseppe





RE: Forging 4130 Prolongation piece for test
What specification are you working to? That specification should be clear on the issue.
rp
RE: Forging 4130 Prolongation piece for test
The only reason for using a prolong to perform destructive QA processes is to save the cost of using a complete forging. In some applications it is required to perform the metallurgical QA on a sample forging, while in other applications it is acceptable to use a prolong.
If the size, shape, and location of the prolong on the forging is such that it may have an effect on the heat treatment results then it would be prudent to remove it prior to heat treating, and process it as a separate piece with the batch/lot it came from. With a steel alloy like 4130, if you process the prolong separately you'll want to make sure the prolong sample has the proper size and shape to produce a heat treat result representative of the forging itself.
Hope that helps.
Terry
RE: Forging 4130 Prolongation piece for test
I think that in same cases it can be accepted to cut before heat treatment, this is because of the shape and geometry. The specification is API 6A and it is not clear at all on this subject.
Rgds
RE: Forging 4130 Prolongation piece for test
I am sorry it has taken me a while to reply, but you are incorrect.
Section 5.7.1 of API 6A is pretty clear about thisIf you remove the prolongation prior to final heat treatment, you will not be meeting the requirements of the specification.
rp