Please have a look at the ASTM A387 spec, Impact properties after Step cooling test is mentioned as "Supplementary Requirements" and should be conducted only if explcitly mentioned in the Client Spec (is it so?)
Purpose of test is to simulate the Material's behaviour after prolonged exposure at higher temperature and suspectibility to Temper Embrittlement mentioned in ASTM spec, S62.
Therefore it's strongly recommended to raise a query to Client if in doubt, Results over the years has shown that it is an overly conservative requirement, adding additonal cost and extended delivery with no percieved benifit.
Pretty sure you would be relaxed with Client's answer to waive this requirement and if not, then we would discuss test in detail, Also note that if Step cooling test is a requirement then Base materials itself should be simulated.
Regards
Manpreet Singh
Dear Experts,
We need to make a manifold for heater of size 60" and 40" diameter of P22 material. It has been decided to use A387 plate for making the manifold.
1. Can anyone give details of What is Step Cooling test connected with this material and what are the requirements of the step cooling test relating to qualification of WPS/PQR.
2.Can we use ER90B3 and E9018B3. Also the Joint configuraiton is Double V groove with backgouging as per client requirements.
3.How much length of plate to be used for preparing the PQR to perform the step cooling test.
4. Further, we have a extruded branch connection of size 4", 5" and 6" of material A 335 Gr.P9, thickness around 7.11. What electrode can we use for this purpose? Do we need to perform the same Step cooling test for this WPS/PQR?
Kindly suggest.
Thanks and regards,
Siva
 |
| Follow Rediff Deal ho jaye! to get exciting offers in your city everyday. |
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
No comments:
Post a Comment