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03461 RATIONALIZATION OF UNALLOYED TITANIUM MATERIAL SPECIFICATIONS TO CURRENT PRODUCTION CAPABILITIES OFFERS OPPORTUNITIES FOR THE TITANIUM INDUSTRY

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Product Number: 51300-03461-SG
ISBN: 03461 2003 CP
Author: James A. McMaster
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The basic chemistry and mechanical properties of the unalloyed titanium grades, and by extension, their palladium and ruthenium enhanced counterparts, in the ASTM mill product specifications were established over 40 years ago. Broad specification limits were included so producers could meet the mechanical and chemical requirements at a time when melting and manufacturing control were not, by today's standards, very good. Based on a study of over 400 recent commercial unalloyed titanium test reports, there may be an opportunity to improve the ASTM mill product specifications by making them more closely approximate material produced under current industry practice. Most significant is the possibility of increasing the specified minimum ultimate tensile strength (UTS) with no change in the grade structure, specified yield strength range, or minimum ductility requirements. This change will directly reduce the cost of pressure equipment and piping built from these materials when the revised limits are adopted in to the ASME Boiler Code. More realistically defined chemistry limits will better clarify the differences among the grades, may limit some problems with high iron material in corrosion service, and will assist users in correctly applying the various unalloyed titanium grades.
The basic chemistry and mechanical properties of the unalloyed titanium grades, and by extension, their palladium and ruthenium enhanced counterparts, in the ASTM mill product specifications were established over 40 years ago. Broad specification limits were included so producers could meet the mechanical and chemical requirements at a time when melting and manufacturing control were not, by today's standards, very good. Based on a study of over 400 recent commercial unalloyed titanium test reports, there may be an opportunity to improve the ASTM mill product specifications by making them more closely approximate material produced under current industry practice. Most significant is the possibility of increasing the specified minimum ultimate tensile strength (UTS) with no change in the grade structure, specified yield strength range, or minimum ductility requirements. This change will directly reduce the cost of pressure equipment and piping built from these materials when the revised limits are adopted in to the ASME Boiler Code. More realistically defined chemistry limits will better clarify the differences among the grades, may limit some problems with high iron material in corrosion service, and will assist users in correctly applying the various unalloyed titanium grades.
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