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Good reasons why UNS S82441/EN 1.4662 should be included in ASTM A923

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New inventions imply that these also should be implemented into relevant standards. Sometimes also minor modifications in the standard setup of the existing procedures are needed. For duplex stainless steels one of the most important aspects is if a correct final solution annealing has been performed giving the material proper properties.

Product Number: 51323-19166-SG
Author: Jan Y Jonsson, Claes Tigerstrand, Javier Avila
Publication Date: 2023
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For both high and low alloyed duplex stainless steels there is a need for methods verifying that the final solution annealing has been adequate not creating detrimental levels of precipitates. The standards ASTM A923(1) and ASTM A1084(2) that provide methods for detecting detrimental phases serve well for this purpose. The duplex steel UNS S82441 is a fairly new duplex stainless steel with somewhat leaner alloying composition than the most common grade type 2205 and should be fitted in either of the two standards. It has earlier been shown that ASTM A923, which focuses on detection of detrimental levels of intermetallic phases for the higher alloyed duplex steels, fits the purpose best. The process has now also started and this paper will summarize the inclusion.


Studies for sensitized material of S82441 has shown that only a minor modification of the corrosion criteria for 2205 type duplex (S31803, S32205) in ASTM A923 is appropriate for inclusion into the standard. It was suggested that criteria in ASTM A923 for methods A (metallography) and B (impact toughness) also can be advised for S82441. For method C (corrosion) the testing temperature was proposed to be lowered to 15°C.
Welds have also been explored as the behavior of welded joints is of great interest for users. For welds it is however recommended, due to relatively big scatter in data, that criteria and usage of the methods should be agreed upon by supplier and purchaser.
In this paper earlier results are reviewed and summarized and reasons for inclusion are presented and discussed. It should be mentioned that also other standards include detection of detrimental phases, the ISO 17781(3) being one.

For both high and low alloyed duplex stainless steels there is a need for methods verifying that the final solution annealing has been adequate not creating detrimental levels of precipitates. The standards ASTM A923(1) and ASTM A1084(2) that provide methods for detecting detrimental phases serve well for this purpose. The duplex steel UNS S82441 is a fairly new duplex stainless steel with somewhat leaner alloying composition than the most common grade type 2205 and should be fitted in either of the two standards. It has earlier been shown that ASTM A923, which focuses on detection of detrimental levels of intermetallic phases for the higher alloyed duplex steels, fits the purpose best. The process has now also started and this paper will summarize the inclusion.


Studies for sensitized material of S82441 has shown that only a minor modification of the corrosion criteria for 2205 type duplex (S31803, S32205) in ASTM A923 is appropriate for inclusion into the standard. It was suggested that criteria in ASTM A923 for methods A (metallography) and B (impact toughness) also can be advised for S82441. For method C (corrosion) the testing temperature was proposed to be lowered to 15°C.
Welds have also been explored as the behavior of welded joints is of great interest for users. For welds it is however recommended, due to relatively big scatter in data, that criteria and usage of the methods should be agreed upon by supplier and purchaser.
In this paper earlier results are reviewed and summarized and reasons for inclusion are presented and discussed. It should be mentioned that also other standards include detection of detrimental phases, the ISO 17781(3) being one.

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