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| UNS S31254 |
UNS NO32760 |
UNS NO8925 |
UNS S31803 |
UNS NO8904 |
UNS NO8825 |
CuNi
90/10 CN102 C70600 C7060X |
CuNi
70/30 CN107 C71500 |
| UNS NO2200 |
UNS NO4400 |
UNS NO6600 |
UNS NO6625 |
UNS NO8800 |
| Grade | Characteristics | Applications |
|---|---|---|
| UNS S31254 |
Austenitic iron-nickel-chromium alloy with increased
molybdenum content. Extremely good resistance to pitting and crevice corrosion, and stress corrosion cracking in halide media. Excellent resistance to a wide range of chemicals and halide containing environments such as seawater. |
Equipment for use in contact with seawater such as heat
exchangers, cooling water pipes and similar components even where
stagnant components can occur. Equipment at pulp bleaching plants, such as drums, vats and press rolls. Tanks and pipelines for various chemicals with high halide levels. |
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| UNS NO32760 |
Duplex austenitic-ferritic iron-nickel-chromium alloy
with molybdenum addition. Very high resistance to pitting, crevice and general corrosion. The Duplex microstructure results in good resistance to stress corrosion cracking. High mechanical strength. Excellent velocity erosion resistance. |
Equipment for most oil and gas field duties including seawater, brines and process fluids. |
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| UNS NO8925 |
Austenitic iron-nickel-chromium alloy with increased
molybdenum and nitrogen contents. Exceptional resistance to pitting, crevice corrosion and stress-corrosion cracking in halide media. High strength. Excellent resistance to a wide range of chemicals. |
Production, processing, storage and transportation of sulphuric and phosphoric acids, even when contaminated with chlorides. Pulp and paper industry. Seawater, oil and gas piping systems on offshore production platforms. Polished rods in sour oil wells. Fluegas desulphurising plants of fossil-fired power stations. Seawater piping systems in desalination plants (reverse osmosis). Fine chemicals production. Salt production. |
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| UNS S31803 |
Duplex, austenitic-ferritic iron-chromium-nickel alloy
with molybdenum addition. Good resistance to pitting. High tensile strength and higher resistance to stress-corrosion cracking and moderate temperatures than that of conventional austenitic stainless steels. |
Chemical and petrochemical processes. Seawater piping systems on offshore oil and gas production platforms, seawater desalination. Pulp and paper industry. |
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| UNS NO8904 |
Austenitic iron-nickel-chromium alloy with high molybdenum
content, copper additions and extremely low carbon content. High resistance to pitting stress-corrosion cracking and intercrystalline corrosion. Excellent resistance to moderately aggressive reducing acids, such as sulphuric and phosphoric acids, as well as many chloride containing media. |
Production, processing, storage and transportation of
sulphuric and phosphoric acids, even when contaminated with chlorides. Pulp and paper industry. Chemical process industry. |
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| UNS NO2200 |
Commercially pure wrought nickel (99.2%). Excellent resistance to many corrosive media, especially to caustic alkalis, halides and a large number of organic compounds. Good mechanical properties within a wide temperature range. Good magnetic and magnetostrictive properties as well as thermal and electrical conductivities. |
Caustic soda production (membrance cell cathodes, evaporation plant), vinyl-chloride monomer (VCM) production, organic chlorinations, food processing, production of soap and detergents. |
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| UNS NO4400 |
Nickel-copper alloy. High strength and toughness over
a wide temperature range. Excellent resistance to flowing seawater. Good resistance to hydrofluoric acid, sulphuric acid, non-oxidizing diluted acids, alkalis and salt solutions, organic acids as well as dry gases such as chlorine and hydrochloric acid. Non susceptible to chloride-induced stress-corrosion cracking. Pressing vessel regulations permit this material to be used at temperatures upto 425° C. |
Salt production, atmosphere crude distillation HF alkylation, high-pressure feedwater heaters in fossil-fired power stations, seawater desalination. Sheathing of offshore platform columns and risers in splash zone. Nuclear fuel processing. |
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| UNS NO6600 |
Nickel-chromium-iron-alloy. For service temperatures to 700° C. Extremely good resistance to nitriding atmospheres. Very good resistance to halogen atmospheres, up to 600° C. Very good carburisation resistance. |
Titanium dioxide production (chloride route). Vinyl chloride monomer (VCM) synthesis. Perchlorethylene synthesis. Nitriding furnace muffles and retorts. Aluminium fluoride and chloride production MDI and TDI production. |
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| UNS NO6625 |
Low carbon nickel-chromium-molybdenum alloy with niobium
addition. Excellent resistance to pitting, crevice corrosion fatigue
and erosion-corrosion. High resistance in a wide range of organic and mineral acids. Good mechanical properties at temperatures up to 450° C. |
Scrubbers and other components in fuel-gas desulphurisation
plants of fossil-fired power stations. Superphosphoric acid production. Nuclear fuel processing. Downhole equipment in sour-gas production. Piping systems on off-shore oil and gas production platforms. |
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| UNS NO8800 |
Austenitic iron-nickel-chromium alloy with controlled
carbon, aluminium, titanium, silicon and manganese contents. Excellent resistance to oxidation, nitriding and hydrogen embrittlement. For service temperatures up to 600° C. |
Heat exchangers and piping systems in chemical and petrochemical plants. Steam generator tubes in fast breeder reactors. Steam superheater tubes. Sheathead heating elements. |
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| UNS NO8825 |
General engineering alloy with good resistance to corrosion
in acids and alkalis under both oxidising and reducing conditions. High Nickel content gives excellent resistance to corrosion cracking. Corrosion resistance is good in over a large range of corrosive media such as Sulphuric, sulphurous, phosphoric, nitric and organic acids and alkalis such as ammonium hydroxide. |
Components such as heating coils, tanks, crates and
baskets for use in sulphuric acid pickling plants. Fuel element dissolvers. Sea water heat exchangers. Pulp digesters in papermaking processes. |
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| CN102, C70600 & C7060X | CuNi 90/10 is a Copper Nickel Iron alloy with a small alloy content of manganese. It allows excellent resistance to sea and brackish water and also combines easy fabrication with good mechanical properties between -100 and +300° C (-150 to 570° F). The minor contents of iron and manganese are to improve the alloy's mechanical properties and its resistance to corrosion and erosion if the iron content is kept in solution by suitable processing. Water velocity should be not less than 0.7m/s (28 in/s) to avoid corrosion due to deposited foreign material. The maximum velocity should be approx 2.5 m/s (100 in/s) for 50mm (2" ID) piping and 3.5 m/s (138 in/s) for > 50mm (2"ID) piping | CuNi 90/10 finds extensive application
due to its very good resistance to corrosion. In seawater it is still
the preferred choice offering low installation cost, long service
life and low expenditure in protective maintenance. It is particularly popular for Construction elements in the shipbuilding industry; Offshore, sheathing of platform legs and cross members; Power generation; Seawater desalination units; Heat ex-changer condensers, preheaters and evaporators; Sea-water cooling systems and cooling pipes, tank-heating coils. |
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| CN107 C71500 |
CuNi 70/30 has the best general resistance to aqueous
corrosion of all the commercially important copper alloys. Resistant to acid solutions and highly resistant to stress corrosion cracking and impingement corrosion. Greater strength than 90/10 copper nickel therefore more acceptable at higher pressures. |
Power station condensers. Sea water pipework and condensers. Desalination plants. Construction and pipework elements of the shipbuilding industry. |
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