Talking specifically about SA-517, UHT-56 mandates PWHT for all grades of thicknesses above
15mm, so was PWHT performed, if so at what temperature?
I would suggest to preform PWHT even if thickness is little lower than 15mm due to major
difference in Hardness readings.
Was same hardness observed in all locations?
Do note that these plates must be tempered at min. 620 deg C (max. upto lower critical
temperature) after quenching to temper the martensite and reduce hardness.
Regards
Manpreet Singh
On Tue, 21 Feb 2012 09:07:22 +0530 wrote
>Dear Sir,
We are using one material which is equivalent to SA-517 material (
Pressure vessel plates, alloy steel, high strength, quenched &
tempered ). with electrode E-11018M. Climatic condition of the
environment is minus 5 degree Centigrade to plus six degree
Centigrade.Parent material hardness is 230 BHN but weld material
hardness is coming approx 400 BHN which is not acceptable. We are
properly maintaining preheating i.e 250 degree Centigrade as well as
interpass temperature is 150 degree centigrade.
Pls guide me how can i reduce this material hardness.
Regards
Pradip
--
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.
 |
| 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