Menu
Search
Filters
Close
Menu

51312-01096-QA/QC TOOLS TO ENSURE THE QUALITY OF DUPLEX STAINLESS STEEL COMPONENTS

Picture for QA/QC TOOLS TO ENSURE THE QUALITY OF DUPLEX STAINLESS STEEL COMPONENTS
Available for download
Product Number: 51312-01096-SG
ISBN: 01096 2012 CP
Author: Roger Francis
Publication Date: 2012
$0.00
$20.00
$20.00
It has long been understood that the heat treatment of duplex and superduplex stainless steels is critical to obtain the optimum structure and the desired properties. Over the last twenty years there have been a number of cases where inadequately heat treated components have been delivered by the manufacturer and then subsequently identified as defective further down the supply chain. In some cases the problem was identified and resolved prior to fabrication and installation in others fittings have leaked in service due to poor microstructure from incorrect heat treatment. Common to all these cases is that the cast and batch production test certificate indicated that the goods met specification requirements in all respects. Hence the similitude between cast and batch specific test pieces and the production parts has been called in to question. The use of additional testing when specifying these alloys is common but there is no agreement on what these tests should be. There has been extensive discussion on how best to test individual components non-destructively to detect unsatisfactory material. Some have suggested that magnetic measurement of the ferrite content is adequate whilst others believe the test to be insufficiently discerning resulting in too many good parts falsely being identified as “suspect” and causing unnecessary remedial action. The present paper describes the procurement specifications used by the authors’ company to ensure adequate properties in service. In addition the strengths and limitations of magnetic ferrite measurements and shows how the readings are affected by manufacturing route product form surface roughness and radius of curvature. The paper goes on to show how the test can be used to identify material that may contain sigma phase and that in-situ metallography is then required on these suspect areas to either release the part or condemn the part to remedial heat treatment. The results of five years successful experience with this combination of tests is discussed.
It has long been understood that the heat treatment of duplex and superduplex stainless steels is critical to obtain the optimum structure and the desired properties. Over the last twenty years there have been a number of cases where inadequately heat treated components have been delivered by the manufacturer and then subsequently identified as defective further down the supply chain. In some cases the problem was identified and resolved prior to fabrication and installation in others fittings have leaked in service due to poor microstructure from incorrect heat treatment. Common to all these cases is that the cast and batch production test certificate indicated that the goods met specification requirements in all respects. Hence the similitude between cast and batch specific test pieces and the production parts has been called in to question. The use of additional testing when specifying these alloys is common but there is no agreement on what these tests should be. There has been extensive discussion on how best to test individual components non-destructively to detect unsatisfactory material. Some have suggested that magnetic measurement of the ferrite content is adequate whilst others believe the test to be insufficiently discerning resulting in too many good parts falsely being identified as “suspect” and causing unnecessary remedial action. The present paper describes the procurement specifications used by the authors’ company to ensure adequate properties in service. In addition the strengths and limitations of magnetic ferrite measurements and shows how the readings are affected by manufacturing route product form surface roughness and radius of curvature. The paper goes on to show how the test can be used to identify material that may contain sigma phase and that in-situ metallography is then required on these suspect areas to either release the part or condemn the part to remedial heat treatment. The results of five years successful experience with this combination of tests is discussed.
Product tags
Also Purchased
Picture for Welding of Lean Duplex Stainless Steel grades: microstructure corrosion resistance and mechanical p
Available for download

51312-01097-Welding of Lean Duplex Stainless Steel grades: microstructure corrosion resistance and mechanical p

Product Number: 51312-01097-SG
ISBN: 01097 2012 CP
Author: David LARGE
Publication Date: 2012
$20.00
Picture for Quality & Performance Review of Duplex Stainless Steel Products – An End Users Perspective
Available for download

51318-10568-Quality & Performance Review of Duplex Stainless Steel Products – An End Users Perspective

Product Number: 51318-10568-SG
Author: Janardhan Rao Saithala / Gurram Bhaskar Rao / Manoj Suryanarayana / Talal Nebhani / Pedro Rincon / Nasser Behlani / Mohammed Ghafri / Amjad Kharusi
Publication Date: 2018
$20.00

Quality assurance and procurement & construction challenges associated with DSS materials and operational best practices to ensure integrity and meet intended design life cycle of DSS components.

 
Picture for UNS N07725 NICKEL ALLOY CONNECTION FAILURE
Available for download

51312-01095-UNS N07725 NICKEL ALLOY CONNECTION FAILURE

Product Number: 51312-01095-SG
ISBN: 01095 2012 CP
Author: Steve S. Shademan
Publication Date: 2012
$20.00
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support