Use code FLASH20 at checkout for 20% off all eBooks and eCourses
In context of acceptability of 17-4 PH in sour service, an literature survey of complex metallurgy of this grade was done following a mechanical rupture in service. In addition, three 17-4 PH materials were studied in terms of microstructure, mechanical properties and susceptibility to sulfide stress cracking.
The use of 17-4 PH in sour service started long before the establishment of MR0175, and its coverage in this document has varied widely over the years. Thus, the real significance of the statement "according to NACE" had become less and less defined. In the context of the present debate on the general acceptability of 17-4 PH in sour service, an extensive literature survey of the very complex metallurgy of this grade has been carried out following a mechanical rupture in service. In addition, three different 17-4 PH materials have been studied in terms of microstructure, mechanical properties and susceptibility to sulfide stress cracking. It is shown that the content of residual ferrite and austenite in this nominally "martensitic" grade is a key issue for its mechanical properties. Regarding sulfide stress cracking resistance, the strong dependence upon the actual stress level has been confirmed. It is concluded that, with just the broad composition range of UNS 17400 and a simplified definition of the heat treatment, the reference to MR0175 cannot as such ensure fitness for purpose. It is then the responsibility of each supplier to qualify its design and manufacturing route.
Key words : 17-4 PH, martensitic stainless steel, sustained load cracking, sulfide stress cracking, microstructure, mechanical properties, ferrite, austenite, martensite.
This paper presents a failure of a material that was overloaded during testing although the raw material was approved based on certified mechanical properties. The failure was due to unsuitable microstructures.
We are unable to complete this action. Please try again at a later time.
If this error continues to occur, please contact AMPP Customer Support for assistance.
Use this error code for reference:
Please login to use Standards Credits*
* AMPP Members receive Standards Credits in order to redeem eligible Standards and Reports in the Store
You are not a Member.
AMPP Members enjoy many benefits, including Standards Credits which can be used to redeem eligible Standards and Reports in the Store.
You can visit the Membership Page to learn about the benefits of membership.
You have previously purchased this item.
Go to Downloadable Products in your AMPP Store profile to find this item.
You do not have sufficient Standards Credits to claim this item.
Click on 'ADD TO CART' to purchase this item.
Your Standards Credit(s)
1
Remaining Credits
0
Please review your transaction.
Click on 'REDEEM' to use your Standards Credits to claim this item.
You have successfully redeemed:
Go to Downloadable Products in your AMPP Store Profile to find and download this item.
A series of NACE TM0177 Tensile Test Method A tests were conducted on various commercially available chromium-manganese austenitic stainless steels as well as 17-4PH in the 110ksi-to-130ksi yield strength range (34 - 35 HRC max).
This new standard is the result of a six-year effort by NACE, EFC and ISO/TC 67/WG 7. Background to the development of the new standard and a summary outlining its impact on materials selection for those familiar with previous documents.