AVAILABILITY

The metallurgical aspects of alloy selection are well covered in this and other works. Along with corrosion resistance, strength, and fabricability, one of the most important material properties is availability. On a large project most alloys can be made in all product forms, in full mill heat lots. A contemporary example is 317LMX , used as flat-rolled product in mill heat lot quantities for flue gas desulfurization scrubbers. This grade is rarely, if ever, carried in stock by mills or service centers. Few mills produce all the forms, such as sheet, plate, bar, pipe, pipe fittings, and appropriate weld fillers, needed to fabricate a chemical process vessel. The minimum quantity a mill requires per product form is large, and lead times can be significant. This may limit flexibility in the event of error, last-minute design changes, or later maintenance needs.

Consider what alternate, if more expensive, grade may be used to fill in for unavailable product forms or sizes. For example, AL-6XN has occasionally been used to fill out a bill of materials specified 317LMX. The stainless steel grades 304L and 316L are used in such quantity that availability is unlikely to be an issue. The same may not be true for more highly alloyed or specialized materials.

STAINLESS STEELS

James Kelly

Rochester, Michigan

Mechanical Engineers’ Handbook: Materials and Mechanical Design, Volume 1, Third Edition.

Edited by Myer Kutz

Copyright  2006 by John Wiley & Sons, Inc.

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