Please see the extracts from various NACE publications as below. NACE TM 0198-2016, is titled:- Slow Strain Rate Test Method(SSRT) for Screening Corrosion-Resistant Alloys (CRAs) for Stress Corrosion Cracking in Sour Oilfield Service. As described here SSRT is a quick screening method applicable for CRA's (stainless steel and Nickel based alloys).
In order to assess the complete compatibility of alloys for sour environment a through testing regime is required. CRA's have good resistance in sour environments however they are used in extremely demanding applications. Also sour service involves many hardenable alloy steels which are extremely prone to HIC.
Hence as per my opinion conventional tests such as HIC/SSC test can't be entirely ruled out from the testing regime of CRAs and other alloy steels for O&G environments.
Thanks.
P.Goswami.P.Eng, IWE.
Independent Welding & Metallurgical Specialist
Saudi Aramco: Designated Project Welding Engineer(DPWR)& Quality Management Personnel
Linkedin: https://www.linkedin.com/in/pradip-goswami-2999855/
Email:pgoswami@quickclic.net,pradip.goswami@gmail.com
Whatsapp:1-905-9793232
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4.6.2.5 Slow Strain Rate Testing (SSRT)
The SSRT method tends to be used as a rapid test to evaluate stainless steels and nickel-based alloys for their likely cracking behavior before carrying out other longer duration tests.
NACE Standard TM0198-2016
SSR test has emerged as a relatively quick, simple method that can be used for the evaluation of CRAs for resistance to a variety of environmental cracking phenomena, including SCC, hydrogen embrittlement, and liquid metal cracking. The use of SSR test methods, particularly in screening tests, has become more common in many laboratories for evaluation of CRAs for downhole applications.
Because of its relatively short test duration, the SSR test has been found useful in evaluating CRAs for resistance to SCC in simulated oilfield production environments at elevated temperatures.4,5 By comparison, it has been observed that it may take thousands of hours of exposure time to evaluate CRAs using more conventional statically stressed specimens.
Section 1: General
1.1 This standard establishes a SSR test method for screening CRAs (i.e., stainless steels and nickel-based alloys) for resistance to SCC at elevated temperatures in sour oilfield production environments. The fact that this test method is a screening method implies that further evaluation or additional experience may be required before materials selection decisions can be made.
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From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Devang Majithia
Sent: February 25, 2019 6:43 AM
To: materials-welding@googlegroups.com
Subject: [MW:29151] SSRT (Slow-Strain-Reducing-Tensile) Testing in lieu of HIC/SSC
Dear All,
Recently through technical articles i came to know that some of the Oil & Gas industries are using SSRT (2 days) in lieu of HIC test (7 days) and SSC test (30 days) due to time consuming and some times HIC/SSC are not a full proof method of ascertaining that even after sample passes in HIC/SSC test, it will not fail in field.
Is it true that through SSRT we can avoid HIC/SSC testing for sour services. What is the acceptance standard for this SSRT test?
Requesting to guide on this subject.
Regards,
Devang Majithia
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