A new steel with good low-temperature sulfuric acid dew point corrosion resistance

In order to compare the corrosion resistance of conventional low carbon steel, Cu containing low carbon steel for sulfuric acid dew-point corrosion inhibition, and stainless 409L, immersion tests were carried out in 50 wt.% sulfuric acid. The effects of HCl concentraion on the corrosion behavior in a fixed sulfuric acid concentration (16.9 vol.%) was also investigated by immersion test. In addition to immersion test, field test in a thermal plant was carried out for 10 months. As a result, it was confirmed that Cu-containing dew-point corrosion resistent steel has the highest corrosion resistance compared with other materials. To verify superior corrosion resistence of dew-point corrosion resistant steel, surface morpology after various test was observed by SEM. It was found that surface corroded product of the dew-point corrosion resistant steel was much denser and thicker compared with the other steel.

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Corrosion Behavior of a Ni–Cr–Mo Alloy Coating Fabricated by Laser Cladding in a Simulated Sulfuric Acid Dew Point Corrosion Environment

Coatings ◽

10.3390/coatings10090849 ◽

2020 ◽

Vol 10 (9) ◽

pp. 849

Author(s):

Chao Zheng ◽

Zongde Liu ◽

Shanshan Chen ◽

Congcong Liu

Keyword(s):

Solid Solution ◽

Corrosion Resistance ◽

Titanium Alloy ◽

Phase Composition ◽

Sulfuric Acid ◽

Corrosion Behavior ◽

Laser Cladding ◽

Intergranular Corrosion ◽

Alloy Coating ◽

Dew Point

For this study, aimed at proposing a potential direction to prevent sulfuric acid dew point corrosion, a Ni–Cr–Mo alloy Hastelloy C22 coating was fabricated by coaxial laser cladding technology. The phase composition, microstructure, and corrosion behavior in a simulated sulfuric acid dew point corrosion environment were investigated and compared with a Hastelloy C22 alloy, a titanium alloy TC4, and 09CrCuSb steel (ND). The results showed that the phase composition of the C22 coating is essentially similar to that of the C22 alloy, consisting of a γ-Ni solid solution and Ni6Mo6C1.06. The finer microstructure of the C22 coating mainly contains eutectic and dentrite, presenting a typical solidification feature of laser cladding. The corrosion resistance of the C22 coating is very close to that of the C22 alloy, and outclasses that of TC4 and ND. The corrosion behavior of the C22 coating is intergranular corrosion resulting from the segregation of molybdenum, chromium containing corrosion products, and smaller anode micro-batteries.

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Waste / Low Quality Heat Recovery and Utilization With Low Temperature Economizers

Volume 1: Fuels and Combustion, Material Handling, Emissions; Steam Generators; Heat Exchangers and Cooling Systems; Turbines, Generators and Auxiliaries; Plant Operations and Maintenance ◽

10.1115/power2013-98110 ◽

2013 ◽

Author(s):

John M. Preston ◽

W. Reid Watson ◽

Charles B. Jones

Keyword(s):

Sulfuric Acid ◽

Fly Ash ◽

Low Temperature ◽

Flue Gas ◽

Heat Recovery ◽

Heat Rate ◽

Economic Feasibility ◽

Dew Point ◽

Plant Performance ◽

Acid Mist

Modern combustion steam-electric plants are designed to recover as much heat as economically feasible from the combustion products. As a part of the continuing effort by utilities to increase plant efficiency, extracting low quality heat from the flue gas stream prior to discharge through the stack to the environment has become economically attractive. “Economic feasibility” is strongly dependent on the cost of the fuel as well as quality of the heat recovered. The economic feasibility of deploying low-temperature economizers to cool flue gas from coal-fired steam-electric plants to a temperature well below the sulfuric acid mist dew point is not commonly practiced but could have a number of salutary effects on unit operations including reduction in fuel use, reduction in water, reduction in fly ash resistivity upstream of cold-side electrostatic precipitators and enhanced mercury oxidation/capture. Using a theoretical 600 MW (nominal) coal fired facility an additional 30.8 MW of electrical output is available with the installation of a Low Temperature Economizer. This represents a 1% improvement in the plant heat rate with an attractive payback period. The components required for this heat recovery sub-system are readily available and the technology has matured to a point where uncertainties are minimized. In addition to improving the operation of the plant, Low Temperature Economizer can reduce emissions of SOx, NOx, Hg, PM and CO2. In a difficult regulatory environment reducing emissions while increasing plant performance is extremely beneficial. Furthermore Low Temperature Economizer lowers the volume of scrubber water required. Cooling the flue gas leaving the air heater below the acid mist dew point is not commonly practiced. The corrosion potential of the condensed sulfuric acid is a major materials selection/maintenance challenge as is the potential for gas-side fouling of the heat exchange surface with fly ash.

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NAS 155N

Alloy Digest ◽

10.31399/asm.ad.ss1059 ◽

2010 ◽

Vol 59 (3) ◽

Keyword(s):

Stainless Steel ◽

Corrosion Resistance ◽

Sulfuric Acid ◽

Heavy Oil ◽

Heat Exchangers ◽

Heat Treating ◽

Dew Point ◽

Custom Made ◽

Wide Range ◽

Acid Environment

Abstract With excellent resistance to sulfuric acid dew-point corrosion, NAS 155N (UNS S31727) is a stainless steel custom made for the heat exchangers, flues, and chimneys of heavy oil-fired boilers. This alloy is suitable in a wide range of material applications for antipollution equipment and other devices exposed to a sulfuric acid environment. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, and joining. Filing Code: SS-1059. Producer or source: Nippon Yakin Kogyo Company Ltd.

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Study on the Corrosion Resistance of Ti(CN) Composites Coating

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.341-342.88 ◽

2013 ◽

Vol 341-342 ◽

pp. 88-91

Author(s):

Dan Dan Li ◽

Jian Jun Hao ◽

Yue Jin Ma ◽

Liang Gao ◽

Jian Guo Zhao

Keyword(s):

Corrosion Resistance ◽

Sulfuric Acid ◽

Sodium Chloride ◽

Low Temperature ◽

Corrosion Rate ◽

Steel Substrate ◽

Polarization Measurement ◽

Mass Ratio ◽

Metal Composites ◽

Butyl Phthalate

Metal composites coating of Ti (CN) was made on the surface of Q235 steel substrate by reaction nitrogen are welding cladding process, and potted with low temperature epoxy, di-n-butyl phthalate and T31, the mass ratio was 10:2:1.5. To evaluate the corrosion resistance of Ti (CN) coating, the specimens were immersed in 5% sulfuric acid and 3.5% sodium chloride to calculate corrosion rate by potentiodynamic polarization measurement. The corrosion resistance of Ti (CN) is improved by 3.45 times in 5% sulfuric acid and 4.39 times in3.5% sodium chloride.

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ISO-ELASTIC

Alloy Digest ◽

10.31399/asm.ad.fe0014 ◽

1957 ◽

Vol 6 (8) ◽

Keyword(s):

Corrosion Resistance ◽

Low Temperature ◽

Physical Properties ◽

Tensile Properties ◽

Temperature Coefficient ◽

Nickel Alloy ◽

Modulus Of Elasticity ◽

Heat Treating ◽

Precision Instrument ◽

Iron Nickel

Abstract ISO-ELASTIC is an iron-nickel alloy having low temperature coefficient of the modulus of elasticity. It is suitable for precision instrument springs. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, and machining. Filing Code: Fe-14. Producer or source: John Chatillon & Sons.

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REVERE No. 430

Alloy Digest ◽

10.31399/asm.ad.cu0063 ◽

1958 ◽

Vol 7 (5) ◽

Keyword(s):

Corrosion Resistance ◽

Sulfuric Acid ◽

High Temperature ◽

Physical Properties ◽

High Resistance ◽

High Strength ◽

Heat Treating ◽

Aluminum Bronze ◽

Temperature Performance ◽

Excellent Corrosion Resistance

Abstract REVERE No. 430 is an aluminum bronze having high strength, excellent corrosion resistance, and high resistance to sulfuric acid. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on low and high temperature performance, and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Cu-63. Producer or source: Revere Copper and Brass Inc..

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COPPER ALLOY No. 510

Alloy Digest ◽

10.31399/asm.ad.cu0238 ◽

1971 ◽

Vol 20 (8) ◽

Keyword(s):

Corrosion Resistance ◽

Low Temperature ◽

Physical Properties ◽

Tensile Properties ◽

Copper Alloy ◽

High Strength ◽

Heat Treating ◽

Fatigue Properties ◽

Temperature Performance ◽

Tin Bronze

Abstract COPPER ALLOY No. 510 is a tin bronze containing about 0.25% phosphorus. It combines high strength and toughness with excellent fatigue properties. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as creep and fatigue. It also includes information on low temperature performance and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Cu-238. Producer or source: Brass mills.

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HASTELLOY ALLOY D

Alloy Digest ◽

10.31399/asm.ad.ni0029 ◽

1956 ◽

Vol 5 (11) ◽

Keyword(s):

Fracture Toughness ◽

Corrosion Resistance ◽

Sulfuric Acid ◽

Physical Properties ◽

Tensile Properties ◽

Boiling Point ◽

Cast Alloy ◽

Heat Treating

Abstract HASTELLOY ALLOY-D is a cast alloy composed primarily of nickel and silicon, and is exceptionally resistant to sulfuric acid of all concentrations even up to the boiling point. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Ni-29. Producer or source: Haynes Stellite Company.

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AMPCOLOY 495

Alloy Digest ◽

10.31399/asm.ad.cu0171 ◽

1966 ◽

Vol 15 (11) ◽

Keyword(s):

Fracture Toughness ◽

Corrosion Resistance ◽

Shear Strength ◽

Low Temperature ◽

Physical Properties ◽

High Strength ◽

Heat Treating ◽

Aluminum Bronze ◽

High Manganese ◽

Temperature Performance

Abstract AMPCOLOY 495 is a high manganese type of aluminum bronze recommended where high strength and corrosion resistance are required along with good weldability. It is recommended for marine equipment and ship propellers. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive and shear strength as well as fracture toughness, creep, and fatigue. It also includes information on low temperature performance and corrosion resistance as well as casting, forming, heat treating, machining, and joining. Filing Code: Cu-171. Producer or source: Ampco Metal Inc..

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