A 28.5%Cr-40%Ni-1%Mo-0.15%N alloy minimizing fireside corrosion in waste incinerators

Book · Sat Dec 31 04:00:00 EST 1994

OSTI ID:80129

Otsuka, N; Natori, A; Kudo, T ^[1]; Imoto, T ^[2]

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1. Sumitomo Metal Industries, Ltd., Amagasaki (Japan)
2. Sumitomo Metal USA Corp., New York, NY (United States)

A new austenitic corrosion resistant alloy of 28.5%Cr-40%Ni-1%Mo-0.15%N was developed for boiler tube application in waste incinerators. To combat corrosion due to chloride salts at low temperatures such as 400 C, Ni content was optimized to 40 wt.%. In contrast, the Cr content was set at 28.5 wt.% in order to assure a good resistance to sulfate/chloride salt mixtures at high temperatures such as 550 C. Localized corrosion such as intergranular corrosion and high temperature stress corrosion cracking (SCC) of conventional austenitic steels and alloys was studied by three point bent-beam test at 400 C with a chloride ash mixture in 0.15% HCl--300ppm SO{sub 2}-7.5% O{sub 2}--7.5% CO{sub 2}--20% H{sub 2}O-bal.N{sub 2}. High temperature SCC occurred for alloys of high Mo content whereas intergranular corrosion was obvious for low Mo and Mo free alloys. Nitrogen addition to alloys suppressed the intergranular corrosion drastically. Based on these findings, it was decided to add 1% Mo and 0.15% N to the new alloy.

• OSTI ID: 80129
• Report Number(s): CONF-940222--
• Country of Publication: United States
• Language: English

Related Subjects

09 BIOMASS FUELS
36 MATERIALS SCIENCE
AUSTENITIC STEELS
CARBON DIOXIDE
CHEMICAL COMPOSITION
CORROSION RESISTANCE
CORROSION RESISTANT ALLOYS
CORROSIVE EFFECTS
CRACK PROPAGATION
EXPERIMENTAL DATA
HYDROCHLORIC ACID
INCINERATORS
MECHANICAL TESTS
STRESS CORROSION
SULFUR DIOXIDE