US20090169418A1 - Component for supercritical water oxidation plants, made of an austenitic stainless steel alloy - Google Patents
Component for supercritical water oxidation plants, made of an austenitic stainless steel alloy Download PDFInfo
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- US20090169418A1 US20090169418A1 US12/299,252 US29925207A US2009169418A1 US 20090169418 A1 US20090169418 A1 US 20090169418A1 US 29925207 A US29925207 A US 29925207A US 2009169418 A1 US2009169418 A1 US 2009169418A1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
- B01J3/008—Processes carried out under supercritical conditions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/02—Apparatus characterised by being constructed of material selected for its chemically-resistant properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/06—Treatment of sludge; Devices therefor by oxidation
- C02F11/08—Wet air oxidation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/06—Treatment of sludge; Devices therefor by oxidation
- C02F11/08—Wet air oxidation
- C02F11/086—Wet air oxidation in the supercritical state
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/02—Apparatus characterised by their chemically-resistant properties
- B01J2219/025—Apparatus characterised by their chemically-resistant properties characterised by the construction materials of the reactor vessel proper
- B01J2219/0277—Metal based
- B01J2219/0286—Steel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/54—Improvements relating to the production of bulk chemicals using solvents, e.g. supercritical solvents or ionic liquids
Definitions
- This invention relates to a component of an austenitic stainless steel alloy, for plants designed to carry out hydrothermal oxidation, more specifically Supercritical Water Oxidation (SCWO).
- SCWO Supercritical Water Oxidation
- waste water i.e. a water sludge containing organic constituents as well as inorganic constituents
- a reactor vessel by means of a high pressure pump in which the water pressure is raised to e.g. 250 bar, or at least above the critical level 221 bar.
- the water is also preheated by means of a heater and an economizer, more specifically to about 400° C, i.e. well above the critical temperature of 374° C.
- the plant includes apparatus for treating the processed water phase leaving the resistant to the corrosivity of the process fluid, e.g. in the temperature range of 270 to 380°, meaning that the apparatus and components get an acceptable service life.
- Another austenitic stainless steel alloy being similar to Alloy 625 in respect of high contents of nickel, is C 276. Both of these grades contains 60% nickel or more.
- the present invention provides an austenitic stainless steel, intended to be in direct contact with supercritical or near supercritical solution, that meets the above-mentioned need, viz. in the form a grade named SANDVIK SANICRO®25 being disclosed e.g. in EP 1194606 B1.
- SANDVIK SANICRO®25 is disclosed e.g. in EP 1194606 B1.
- SANDVIK SANICRO®25 is at least as good as, and in certain respects even better than, the high-alloyed grade A 625 as regards corrosion resistance and service life.
- An austenitic stainless steel alloy according to the present invention comprises (by weight) 20 to 35% nickel(Ni), and 15 to 30% chromium (Cr).
- the alloy comprises 20 to 35% nickel (Ni); 15 to 30% chromium (Cr); and 0,5 to 6,0% copper (Cu).
- the alloy according to the invention may advantageously comprise (by weight): 20 to 35% nickel (Ni); 15 to 30% chromium (Cr); 0,5 to 6,0 % copper (Cu); 0,01 to 0,10% carbon (C); 0,20 to 0,60% niobium (Nb), 0,4 to 4,0% tungsten (W); 0,10 to 0,30% nitrogen (N); 0,5 to 3,0% cobalt (Co); 0,02 to 0,10% titanium (Ti); not more than 4,0% molybdenum (Mo); not more than 0,4% silicon (Si); and not more than 0,6% manganese (Mn), the balance being iron and normal steelmaking impurities.
- FIG. 1 illustrates the weight change of two alloys according to the invention and Alloy 625 when exposed to a simulated SCWO environment at 350° C. for 125 hours.
- FIG. 2 illustrates the weight change of two alloys according to the invention and Alloy 625 when exposed to a simulated SCWO environment at 600° C. for 125 hours.
- Nickel is an essential constituent for the purpose of ensuring a stable austenitic structure.
- the structural stability is depending on the relative amounts of, on one hand, the ferrite stabilizers, such as chromium, silicon, tungsten, titanium and niobium, and, on the other hand, the austenite stabilizers, such as nickel, carbon and nitrogen.
- the nickel content should be at least 20%, and preferably at least 22,5%. It may also be 25% or higher.
- an increased nickel content suppresses the oxide growth rate and improves the tendency to form a continuous chromium oxide layer.
- the nickel content should not exceed 35%, and preferably not 32%.
- the nickel content of the alloy is restricted to the range of 20 to 35%.
- Chromium is effective of improving the general corrosion resistance and the oxidation resistance.
- a chromium content of at least 15% is prescribed.
- chromium may be added. If, however, the chromium content would exceed 27% and approach 30%, the nickel content must be further increased in order to produce a stable austenitic structure.
- a content of chromium exceeding 30% would necessitate an increase of the content of nickel to a level being too high (above 35%) to ensure a cost-efficient composition. For these reasons the chromium content is restricted to the range of 15 to 30%, preferably 20 to 27%.
- Copper is added in order to produce a copper-enriched phase, finely and uniformly precipitated in the matrix, which contributes to an improvement of the creep rupture strength. Such an effect calls for an amount of at least 0,5% copper, a marked improvement being achieved of about 2%. Copper is also added for improving the general corrosion resistance against sulphuric acid. However, an excessive amount of copper (6% or more) would result in a reduced workability. Also for economical reasons the Cu-content should be kept moderate, e.g. at 3,5%. In view of these considerations the copper content is restricted to the range of 0,5 to 6%, preferably 2 to 3,5%.
- Carbon is a constituent effective to provide adequate tensile strength and creep rupture strength required for high temperature steel. If, however, too much carbon is added, the toughness of the alloy is reduced and the weldability may deteriorate. Furthermore a carbon content being too high would reduce the corrosion resistance in SCWO-environments. For these reasons, the carbon content is restricted to maximally 0,1%. Preferably it may amount to at least 0,04% and at most 0,08%.
- Niobium is generally accepted to contribute to the improvement of the creep rupture strength by the precipitation of carbonitrides and nitrides. However, an excessive amount of niobium may decrease the weldability and the workability. In view of these considerations, the niobium content is restricted to a range of 0,20 to 0,60%. Preferably the niobium content should be at least 0,33% and at most 0,50%
- Tungsten is added to improve the high temperature strength, mainly by solid solution hardening, and a minimum of 0,4% is being needed to achieve this effect.
- Tungsten and molybdenum are also contributing to the general corrosion resistance in SCWO-environments.
- both molybdenum and tungsten promote the formation of the sigma phase.
- Tungsten is considered to be more effective than molybdenum in improving the strength.
- the molybdenum content is held low, not more than 0,5%, preferably lower than 0,02%.
- the tungsten content should not exceed 4%, and therefore the tungsten content is restricted to a range of 0,4 to 4%, preferably 1,8 to 3,5%.
- Nitrogen as well as carbon, is known to improve the strength at elevated temperatures, e.g. above 500° C., and the creep rupture strength, as well as to stabilize the austenite phase. However, if nitrogen is added in excess, the toughness the and ductility of the alloy are reduced. For these reasons, the content of nitrogen is defined to the range of 0,10 to 0,30%, preferably 0,20-0,25%.
- Cobalt is an austenite-stabilizing element.
- the addition of cobalt may improve the high temperature strength by solid solution strengthening and suppression of sigma phase formation after long exposure times at elevated temperatures.
- the cobalt content should be in the range 0,5 to 3,0%, if added.
- Titanium may be added for the purpose of improving the creep rupture strength by the precipitation of carbonitrides, carbides and nitrides.
- an excessive amount of titanium can decrease the weldability and the workability.
- the content of titanium is defined to a range of 0,02 to 0,10%, if added.
- All of these components may in turn be used (individually or in combination) to design the various apparatus and devices included in a complete SCWO-plant, such as a reactor, an oxygen tank, a sludge water tank, a vaporizer, an economizer, a steam boiler, a cooler, a gas/liquid separator, as well as various valves, accumulators, pressure reduction devices, fluid oscillators, injectors, nozzles, filters and traps.
- Tubes and plates are simple to produce from the steel alloy described above.
- components according to the present invention i.e. components consisting of a steel alloy as specified above, it is expected that the material costs in connection with the erection of SCWO-plants, will be reduced by roughly 25 to 40% in comparison with the costs for high-alloyed grades, such as Alloy 625, as regards the vital equipment upstream and downstream the reactor of the plant. Accordingly the invention will contribute positively to the future development and utilization of the SCWO-technique as a method of disposing organic waste products in a manner being harmless to the environment.
- Rectangular coupons were cut out of the alloys and thereafter ground (80 to 1000 mesh) and polished (9 to 0,25 ⁇ m diamond). The coupons were weighted before and after exposure to the above identified experimental conditions. The surface layers formed during the experiments were investigated by field emission-scanning electron microscopy (SEM) and X-ray microanalysis (EDX). Further examination of the coupons was made by optical microscopy. The corrosion attack was evaluated by microscopic observation.
- SEM field emission-scanning electron microscopy
- EDX X-ray microanalysis
- the coupons from the test were cleaned with distilled water and acetone, and final blown-dried for back-weighing and to perform further examination steps.
- the test resulted in a considerable loss of material, indicated by the weight change.
- Weight and dimension before exposure and amount of weight change after the run in 350° C. is given in Table 3. The mean values are depicted in FIG. 1 .
- the coupons were imaged by scanning electron microscopy (SEM) and subsequently, the elemental composition of the surface layers was analyzed by energy dispersive X-ray spectrometry [EDX].
- EDX energy dispersive X-ray spectrometry
- the coupons were imaged by scanning electron microscopy (SEM) and subsequently, the elemental composition of the surface layers was analyzed by energy dispersive X-ray spectrometry [EDX].
- EDX energy dispersive X-ray spectrometry
- the component provides mechanical strength comparable to commonly used construction materials in SCWO-plants, combined with improved or comparable resistance to corrosion when the component is in direct contact with supercritical or near supercritical solutions.
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Abstract
The present invention relates to a component with improved corrosion resistance for use in supercritical water oxidation plants. The component is made of an austenitic stainless steel alloy comprising 15-30% Cr and 20-35% Ni.
Description
- This invention relates to a component of an austenitic stainless steel alloy, for plants designed to carry out hydrothermal oxidation, more specifically Supercritical Water Oxidation (SCWO). Such oxidation is of great potential interest as a method of disposing a number of waste products, especially for environmental reasons.
- When water is pressurized to at least 221 bar and heated to a temperature above 374° C., it enters a supercritical state in which the physical properties thereof change dramatically inasmuch as organics and gases become completely soluble therein, thus eliminating mass transfer constraints. If oxygen is added to organic constituents under these conditions, a very rapid and efficient destruction reaction takes place. As a matter of fact a destruction efficiency of 99,999% can be achieved in the course of seconds, regardless of the nature of the organic species.
- In order to make the SCWO-process industrially practicable, a variety of plants have been developed during the recent decades. Though the design of those plants may vary, the process therein is basically carried out by feeding waste water, i.e. a water sludge containing organic constituents as well as inorganic constituents, from a storage tank to a reactor vessel by means of a high pressure pump in which the water pressure is raised to e.g. 250 bar, or at least above the critical level 221 bar. Before entering the reactor vessel the water is also preheated by means of a heater and an economizer, more specifically to about 400° C, i.e. well above the critical temperature of 374° C. From another tank oxygen is pumped through a vaporizer to the reactor vessel, in which oxidation immediately takes places. Then the organics are dissolved, while generating heat in an autothermal process by which the temperature is further raised to 550 to 600° C. This process occurs even if the content of organics in the waste water is low (3 to 6%), meaning that surplus heat always becomes available for heating the waste water passing the economizer towards the reactor. Furthermore the plant includes apparatus for treating the processed water phase leaving the resistant to the corrosivity of the process fluid, e.g. in the temperature range of 270 to 380°, meaning that the apparatus and components get an acceptable service life. A severe disadvantage of high-alloyed nickel-based grades, such as Alloy 625, is, however, that they are very expensive due to the high contents of nickel and molybdenum, resulting in heavy investment costs for erecting the plants. Another austenitic stainless steel alloy being similar to Alloy 625 in respect of high contents of nickel, is C 276. Both of these grades contains 60% nickel or more.
- Aiming at reducing the costs of the constructing materials, attempts have also been made to use, in SCWO-plants, low-alloyed grades such as 304 L and 316 L, which contain quite moderate amounts of nickel (8 to 15%) and chromium (18 to 20%), and therefore are inexpensive in comparison with the high-alloyed grades. It has, however, turned out that 304 L and 316 L neither resist the high pressure (221 bar) nor the high corrosivity of the fluid in the region immediately below the supercritical temperature point (374° C).
- In the patent literature the use of nickel-based and high-alloyed stainless steel alloys in SCWO-plants is disclosed e.g. in U.S. Pat. No. 6,958,122 (Inconel and Hastelloy) and U.S. Pat. No. 5,804,066 (Inconel), while the use of the low-alloyed 316 L is mentioned in U.S. Pat. No. 5,823,220.
- For the sake of completeness it may also be mentioned that the use of ceramics and/or cermets, chiefly as linings and coatings of constructing components in SCWO-plants, has been suggested by U.S. Pat. No. 5,358,645, U.S. Pat. No. 5,461,648, and U.S. Pat. No. 5,545,337. Though ceramics are quite resistant to corrosion, they do, however, limit the freedom of constructional design to an exorbitant extent, meaning that the various structures of the plant cannot be carried out in the best manner regarding e.g. mechanical strength, weldability, functioning, etcetera.
- The shortcomings of the known constructing materials accounted for above hamper the development and the commercialization of the SCWO technique into an attractive alternative to the traditional methods of waste destruction, such as incineration, in spite of the fact that supercritical water oxidation is superior in many respects, e.g. environmentally, and as regards the ability of taking care of hazardous waste products in a safety manner. Therefore a need still exists for a constructing material, which is reasonably inexpensive and nevertheless adapted to its purpose as to resistance to corrosion, mechanical strength, temperature strength, weldability, and machinability.
- The present invention provides an austenitic stainless steel, intended to be in direct contact with supercritical or near supercritical solution, that meets the above-mentioned need, viz. in the form a grade named SANDVIK SANICRO®25 being disclosed e.g. in EP 1194606 B1. Thus it has turned out that an alloy essentially designed as specified in said patent document does not only successfully cope with high mechanical loads, but also provides an acceptable corrosion protection in SCWO environments, notwithstanding the fact that SANDVIK SANICRO®25 contains quite moderate contents of expensive constituents (above all nickel) and therefore is less expensive to produce than Alloy 625 and Alloy C 276.
- As will be evident from the subsequent report on a corrosion test, SANDVIK SANICRO®25 is at least as good as, and in certain respects even better than, the high-alloyed grade A 625 as regards corrosion resistance and service life.
- An austenitic stainless steel alloy according to the present invention comprises (by weight) 20 to 35% nickel(Ni), and 15 to 30% chromium (Cr).
- In a more preferred embodiment the alloy comprises 20 to 35% nickel (Ni); 15 to 30% chromium (Cr); and 0,5 to 6,0% copper (Cu).
- In practice the alloy according to the invention may advantageously comprise (by weight): 20 to 35% nickel (Ni); 15 to 30% chromium (Cr); 0,5 to 6,0 % copper (Cu); 0,01 to 0,10% carbon (C); 0,20 to 0,60% niobium (Nb), 0,4 to 4,0% tungsten (W); 0,10 to 0,30% nitrogen (N); 0,5 to 3,0% cobalt (Co); 0,02 to 0,10% titanium (Ti); not more than 4,0% molybdenum (Mo); not more than 0,4% silicon (Si); and not more than 0,6% manganese (Mn), the balance being iron and normal steelmaking impurities.
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FIG. 1 illustrates the weight change of two alloys according to the invention and Alloy 625 when exposed to a simulated SCWO environment at 350° C. for 125 hours. -
FIG. 2 illustrates the weight change of two alloys according to the invention and Alloy 625 when exposed to a simulated SCWO environment at 600° C. for 125 hours. - The constituents of the alloy utilized according to a preferred embodiment of the invention are discussed below (all percentages being by weight).
- Nickel
- Nickel is an essential constituent for the purpose of ensuring a stable austenitic structure. The structural stability is depending on the relative amounts of, on one hand, the ferrite stabilizers, such as chromium, silicon, tungsten, titanium and niobium, and, on the other hand, the austenite stabilizers, such as nickel, carbon and nitrogen. In order to suppress the formation of sigma phases after a long time at elevated temperatures, particularly when using a high content of chromium, tungsten and niobium needed to ensure a high temperature corrosion resistance and a high creep rupture strength, the nickel content should be at least 20%, and preferably at least 22,5%. It may also be 25% or higher. At a specific chromium level, an increased nickel content suppresses the oxide growth rate and improves the tendency to form a continuous chromium oxide layer. However, in order to keep the material cost at a reasonable level, the nickel content should not exceed 35%, and preferably not 32%. In view of the above considerations, the nickel content of the alloy is restricted to the range of 20 to 35%.
- Chromium
- Chromium is effective of improving the general corrosion resistance and the oxidation resistance. In order to achieve a sufficient resistance in these respects, a chromium content of at least 15% is prescribed. Preferably 20%, or more, chromium may be added. If, however, the chromium content would exceed 27% and approach 30%, the nickel content must be further increased in order to produce a stable austenitic structure. A content of chromium exceeding 30% would necessitate an increase of the content of nickel to a level being too high (above 35%) to ensure a cost-efficient composition. For these reasons the chromium content is restricted to the range of 15 to 30%, preferably 20 to 27%.
- Copper
- Copper is added in order to produce a copper-enriched phase, finely and uniformly precipitated in the matrix, which contributes to an improvement of the creep rupture strength. Such an effect calls for an amount of at least 0,5% copper, a marked improvement being achieved of about 2%. Copper is also added for improving the general corrosion resistance against sulphuric acid. However, an excessive amount of copper (6% or more) would result in a reduced workability. Also for economical reasons the Cu-content should be kept moderate, e.g. at 3,5%. In view of these considerations the copper content is restricted to the range of 0,5 to 6%, preferably 2 to 3,5%.
- Carbon
- Carbon is a constituent effective to provide adequate tensile strength and creep rupture strength required for high temperature steel. If, however, too much carbon is added, the toughness of the alloy is reduced and the weldability may deteriorate. Furthermore a carbon content being too high would reduce the corrosion resistance in SCWO-environments. For these reasons, the carbon content is restricted to maximally 0,1%. Preferably it may amount to at least 0,04% and at most 0,08%.
- Niobium
- Niobium is generally accepted to contribute to the improvement of the creep rupture strength by the precipitation of carbonitrides and nitrides. However, an excessive amount of niobium may decrease the weldability and the workability. In view of these considerations, the niobium content is restricted to a range of 0,20 to 0,60%. Preferably the niobium content should be at least 0,33% and at most 0,50%
- Tungsten and Molybdenum
- Tungsten is added to improve the high temperature strength, mainly by solid solution hardening, and a minimum of 0,4% is being needed to achieve this effect. Tungsten and molybdenum are also contributing to the general corrosion resistance in SCWO-environments. However, both molybdenum and tungsten promote the formation of the sigma phase. Tungsten is considered to be more effective than molybdenum in improving the strength. For this reason and for economical reasons, the molybdenum content is held low, not more than 0,5%, preferably lower than 0,02%. In order to maintain a sufficient workability the tungsten content should not exceed 4%, and therefore the tungsten content is restricted to a range of 0,4 to 4%, preferably 1,8 to 3,5%.
- Nitrogen
- Nitrogen, as well as carbon, is known to improve the strength at elevated temperatures, e.g. above 500° C., and the creep rupture strength, as well as to stabilize the austenite phase. However, if nitrogen is added in excess, the toughness the and ductility of the alloy are reduced. For these reasons, the content of nitrogen is defined to the range of 0,10 to 0,30%, preferably 0,20-0,25%.
- Cobalt
- Cobalt is an austenite-stabilizing element. The addition of cobalt may improve the high temperature strength by solid solution strengthening and suppression of sigma phase formation after long exposure times at elevated temperatures. However, in order to keep the production cost at a reasonable level, the cobalt content should be in the range 0,5 to 3,0%, if added.
- Titanium
- Titanium may be added for the purpose of improving the creep rupture strength by the precipitation of carbonitrides, carbides and nitrides. However, an excessive amount of titanium can decrease the weldability and the workability. For these reasons, the content of titanium is defined to a range of 0,02 to 0,10%, if added.
- As examples of components or structural members, intended to be in direct contact with supercritical or near supercritical solution, made from the steel alloy according the invention, the following ones may be mentioned: Tubes, plates, bars, rods, strips, foils, linings, blocks, sleeves, wires, beams, girders, pillars and webs. All of these components may in turn be used (individually or in combination) to design the various apparatus and devices included in a complete SCWO-plant, such as a reactor, an oxygen tank, a sludge water tank, a vaporizer, an economizer, a steam boiler, a cooler, a gas/liquid separator, as well as various valves, accumulators, pressure reduction devices, fluid oscillators, injectors, nozzles, filters and traps. Tubes and plates are simple to produce from the steel alloy described above.
- By using components according to the present invention, i.e. components consisting of a steel alloy as specified above, it is expected that the material costs in connection with the erection of SCWO-plants, will be reduced by roughly 25 to 40% in comparison with the costs for high-alloyed grades, such as Alloy 625, as regards the vital equipment upstream and downstream the reactor of the plant. Accordingly the invention will contribute positively to the future development and utilization of the SCWO-technique as a method of disposing organic waste products in a manner being harmless to the environment.
- Test Report
- Three different superalloys were tested in order to determine the corrosion resistance under near-critical and supercritical solution conditions. The superalloys were exposed to a pressure of 29 MPa and temperatures of 350° C. and 600° C., respectively, for 125 hours. In order to simulate a severe SCWO environment, the solution contained chloride ions and oxygen. The compositions of the tested alloys are disclosed in Table 1 and the experimental conditions are summarized in Table 2. The two runs differ only in the temperatures applied and therefore in the density of the fluid.
-
TABLE 1 Alloy Al Si Ti Cr Mn Fe Co Ni Cu Nb Mo W 1 — — — 23.6 0.7 42.5 1.9 24.1 2.7 0.4 — 4.1 2 0.2 0.2 — 28.2 5.0 27.6 — 32.1 — 0.7 5.8 — Alloy 0.3 — 0.3 23.1 — 2.1 — 60.5 — 4.5 9.1 — 625 -
TABLE 2 Mass Test Time Temp. Pressure Density flow Composition of No. [h] [° C.] [MPa] [g/cm3] [m/min] solution [mol/l] Run 1 125 350 29 0.64 1.0 1.0H2O + 0.05HCl + 0.5O2 Run 2 125 600 29 0.087 1.0 1.0H2O + 0.05HCl + 0.5O2 - Rectangular coupons were cut out of the alloys and thereafter ground (80 to 1000 mesh) and polished (9 to 0,25 μm diamond). The coupons were weighted before and after exposure to the above identified experimental conditions. The surface layers formed during the experiments were investigated by field emission-scanning electron microscopy (SEM) and X-ray microanalysis (EDX). Further examination of the coupons was made by optical microscopy. The corrosion attack was evaluated by microscopic observation.
- Results for 350° C.
- The coupons from the test were cleaned with distilled water and acetone, and final blown-dried for back-weighing and to perform further examination steps. The test resulted in a considerable loss of material, indicated by the weight change. Weight and dimension before exposure and amount of weight change after the run in 350° C. is given in Table 3. The mean values are depicted in
FIG. 1 . -
TABLE 3 X Y Z Weight Weight Alloy [mm] [mm] [mm] before [g] after [g] Δ [g] Δ [%] 1 20.0 9.68 1.95 3,005 2,365 −0.640 −21.3 2 20.7 9.89 1.9 3,033 2,120 −0.913 −30.1 Alloy 20.5 10.0 1.7 2,803 2,120 −0.683 −24.4 625 -
TABLE 4 EDX-results of the scale layers formed on the coupons during exposure at 350° C. [wt.-%] Alloy 1 2 Alloy 625 O 29.9 36.9 36.3 Cl 2.0 0.3 1.7 Al 0.3 0.8 0.9 Si — — 0.1 Ti — — 0.5 Cr 30.8 23.4 18.9 Mn 0.6 1.8 0.7 Fe 18.6 23.2 13.1 Co 1.3 — — Ni 9.8 5.8 14 Cu 2 — — Nb 0.6 2 5.1 Mo — 3.6 7.1 W 4.3 2 1.4 - The coupons were imaged by scanning electron microscopy (SEM) and subsequently, the elemental composition of the surface layers was analyzed by energy dispersive X-ray spectrometry [EDX]. The microanalytical results of the surfaces revealed a composition of the scale mainly of oxides and small amount of chlorine, the results are listed in Table 4.
- Results for 600° C.
- No remarkable corrosion attack was observed on the samples after exposure. Only a thin oxide layer remained on the specimen surface, indicated by a small weight gain. Weight and dimension before exposure and amount of weight change after the run at 600° C. is given in Table 5. The mean values are depicted in
FIG. 2 . - The coupons were imaged by scanning electron microscopy (SEM) and subsequently, the elemental composition of the surface layers was analyzed by energy dispersive X-ray spectrometry [EDX]. The EDX analysis confirmed an oxidic composition of the thin layers formed. A summary of the EDX results is listed in Table 6.
-
TABLE 5 X Y Z Weight Weight Alloy [mm] [mm] [mm] before [g] after [g] Δ [g] Δ [%] 1 20.0 9.60 1.8 2.729 2.745 0.016 0.06 2 20.3 9.75 1.8 2.872 2.889 0.017 0.06 Alloy 625 20.6 10.1 1.7 2.839 2.848 0.009 0.03 -
TABLE 6 EDX-results of the scale layers formed on the coupons during exposure at 600° C. [wt.-%] Alloy 1 2 Alloy 625 O 30.3 30.9 27.3 Cl — — — Al — — 0.5 Si — — — Ti 1.8 1 0.9 Cr 3.5 9.9 6.5 Mn 1.6 2.7 1.5 Fe 41 31.9 4.9 Co <0.5 — — Ni 21.1 22.5 53.3 Cu — — — Nb <0.1 — 4.8 Mo — 1.1 <0.3 W — — — - The component, according to the present invention, provides mechanical strength comparable to commonly used construction materials in SCWO-plants, combined with improved or comparable resistance to corrosion when the component is in direct contact with supercritical or near supercritical solutions.
Claims (15)
1: A component for use in supercritical water oxidation plants, made of an austenitic stainless steel alloy comprising; in weight-%
15 to 30% chromium; and
20 to 35% nickel,
wherein the component is intended to be in direct contact with supercritical or near supercritical solution.
2: A component of claim 1 , wherein the alloy comprises, in weight-%:
15 to 30% chromium;
20 to 35% nickel; and
0.5 to 6.0% copper.
3: A component of claim 1 , wherein the alloy further comprises 0.01 to 0.10% carbon.
4: A component of claim 1 , wherein the alloy further comprises not more than 4.0% molybdenum.
5: A component of claim 1 , wherein the alloy further comprises 0.2 to 0.6% niobium.
6: A component of claim 1 , wherein the alloy comprises 0.4 to 4.0% tungsten.
7: A component of claim 1 , wherein the alloy comprises 0.10 to 0.30% nitrogen.
8: A component of claim 1 , wherein the alloy further comprises 0.5 to 3% cobalt.
9: A component of claim 1 , wherein the alloy comprises 0.02 to 0.10% titanium.
10: A component according to claim 1 , being in the form a plate, a tube, a bar, a rod, a strip, a foil, a lining, a sleeve, a block, a wire, a beam, a girder, a pillar, or a web.
11: A component according to claim 10 wherein the component is at least a part of a reactor, an oxygen tank, a sludge water tank, a vaporizer, an economizer, a steam boiler, a cooler, a gas/liquid separator, a valve, an accumulator, a pressure reduction device, a fluid oscillator, an injector, a nozzle, a filter or a trap.
12: Use of an austenitic stainless steel alloy comprising 15-30% Cr and 20-35% Ni in supercritical water oxidation plants.
13: Use of an austenitic stainless steel alloy according to claim 12 , wherein the austenitic stainless steel alloy is intended to be in direct contact with supercritical or near supercritical solution.
14: Use of an austenitic stainless steel alloy according to claim 12 wherein the austenitic stainless steel alloy comprise (by weight): 20 to 35% nickel; 15 to 30% chromium; 0.5 to 6.0% copper; 0.01 to 0.10% carbon; 0.20 to 0.60% niobium 0.4 to 4.0% tungsten; 0.10 to 0.30% nitrogen; 0.5 to 3.0% cobalt; 0.02 to 0.10% titanium; not more than 4.0% molybdenum; not more than 0.4% silicon; and not more than 0.6% manganese, the balance being iron and normal steelmaking impurities.
15: A supercritical water oxidation plant, comprising a component made of an austenitic stainless steel alloy comprising; in weight-%:
15 to 30% chromium; and
20 to 35% nickel,
wherein the component is in direct contact with supercritical or near supercritical solution.
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SE0600982-3 | 2006-05-02 | ||
SE0600982A SE0600982L (en) | 2006-05-02 | 2006-05-02 | A component for supercritical water oxidation plants, made of an austenitic stainless steel alloy |
PCT/SE2007/050288 WO2007126383A1 (en) | 2006-05-02 | 2007-04-27 | A component for supercritical water oxidation plants, made of an austenitic stainless steel alloy |
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US (1) | US20090169418A1 (en) |
EP (1) | EP2016031A4 (en) |
JP (1) | JP2009535516A (en) |
KR (1) | KR20090005145A (en) |
CN (1) | CN101460414A (en) |
SE (1) | SE0600982L (en) |
WO (1) | WO2007126383A1 (en) |
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US20120145094A1 (en) * | 2011-12-13 | 2012-06-14 | Renmatix, Inc. | Lignin fired supercritical or near critical water generator, system and method |
US20180100221A1 (en) * | 2016-10-12 | 2018-04-12 | Hyundai Motor Company | Stainless steel having excellent oxidation resistance at high temperature |
DE102019123174A1 (en) * | 2019-08-29 | 2021-03-04 | Mannesmann Stainless Tubes GmbH | Austenitic steel alloy with improved corrosion resistance when exposed to high temperatures |
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US9347121B2 (en) | 2011-12-20 | 2016-05-24 | Ati Properties, Inc. | High strength, corrosion resistant austenitic alloys |
SE545185C2 (en) * | 2021-09-07 | 2023-05-09 | Alleima Emea Ab | An austenitic alloy object |
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Also Published As
Publication number | Publication date |
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CN101460414A (en) | 2009-06-17 |
SE529428C2 (en) | 2007-08-07 |
SE0600982L (en) | 2007-08-07 |
EP2016031A1 (en) | 2009-01-21 |
JP2009535516A (en) | 2009-10-01 |
WO2007126383A1 (en) | 2007-11-08 |
KR20090005145A (en) | 2009-01-12 |
EP2016031A4 (en) | 2011-03-16 |
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