Advantages of Zr 705 in the acetic acid industry

Conference · Sun Oct 01 04:00:00 EDT 1995

OSTI ID:109931

Bird, K W ^[1]; Breig, P G; Spence, T C ^[2]

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1. Teledyne Wah Chang, Albany, OR (United States)
2. Duriron Company, Inc., Dayton, OH (United States)

Zirconium 705 (Zr + 2--3% niobium) is finding its way into more acetic acid plants as a replacement for Zirconium 702 (unalloyed Zr). The alloy was first proposed for the Chemical Process Industry (CPI) use in the early 1970s, but has not found wide spread use because of a few problems early in its history. Research revealed that the problems encountered were related to delayed hydride cracking (DHC). However, proper processing of the alloy after welding produces components free of DHC. The main advantage of Zirconium 705 (Zr 705) as compared to Zirconium 702 (Zr 702) is higher tensile and yield strengths. This allows pressure containing components to be rated at higher pressures which can increase plant efficiencies or they can be fabricated with thinner wall sections, thus reducing equipment cost. These advantages of Zr 705 will be reviewed as well as actual plant history of the alloy in acetic acid services.

• OSTI ID: 109931
• Report Number(s): CONF-950304--
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
36 MATERIALS SCIENCE
ACETIC ACID
CHEMICAL PLANTS
CORROSION RESISTANT ALLOYS
CORROSIVE EFFECTS
HYDROGEN EMBRITTLEMENT
MECHANICAL PROPERTIES
NIOBIUM ALLOYS
ZIRCONIUM BASE ALLOYS