metboss
Petroleum
- Sep 12, 2012
- 152
Hi All,
Can anyone please advise me on below query ?
We received raw material (Super Duplex Steel Bars UNS S32760, size: 160mm OD, Heat treatment: Solution Annealed and quenched) and it was found that 19 HRC(216 BHN) in Material Test certificate.
But, when we measured, the actual hardness is found to be 255 BHN which is within the acceptable limits of hardness as required for Super Duplex (270 BHN Max).
When we contacted our principal supplier about the differences which we found in hardness values, they clarified that mill performs hardness at mid wall and that’s why, mill measured hardness value (216 BHN=19HRC)) is lower than surface hardness value (255 BHN) what we measured.
Can we accept this justification ? What is the minimum hardness value for Super Duplex ?
The intended material should have a greater abrasion resistance and it will be used for downhole completion (drilling) application.
Thanks and regards
Can anyone please advise me on below query ?
We received raw material (Super Duplex Steel Bars UNS S32760, size: 160mm OD, Heat treatment: Solution Annealed and quenched) and it was found that 19 HRC(216 BHN) in Material Test certificate.
But, when we measured, the actual hardness is found to be 255 BHN which is within the acceptable limits of hardness as required for Super Duplex (270 BHN Max).
When we contacted our principal supplier about the differences which we found in hardness values, they clarified that mill performs hardness at mid wall and that’s why, mill measured hardness value (216 BHN=19HRC)) is lower than surface hardness value (255 BHN) what we measured.
Can we accept this justification ? What is the minimum hardness value for Super Duplex ?
The intended material should have a greater abrasion resistance and it will be used for downhole completion (drilling) application.
Thanks and regards