US3770426A - Cold formable valve steel - Google Patents
Cold formable valve steel Download PDFInfo
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- US3770426A US3770426A US00181399A US3770426DA US3770426A US 3770426 A US3770426 A US 3770426A US 00181399 A US00181399 A US 00181399A US 3770426D A US3770426D A US 3770426DA US 3770426 A US3770426 A US 3770426A
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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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- This invention pertains to steels especially adapted for use in exhaust valves for internal combustion engines, and provides a steel of novel composition and improved properties therefor, which is further characterized over steels which are presently commercially acceptable for such applications, 'in being coldformable, as by upsetting and extruding, into valve configuration.
- the steel of the present invention is particularly adapted for use in exhaust valves for automobile engines, the required combination of room and elevated temperature properties for which are particularly severe.
- Typical minimum physical property requirements for a cold formable valve steel-for such applications are as follows:
- the elevated temperature rupture strength as measured by stress for 1% stretch at l,350 F. in 100 hours, should be 6,000 psi minimum, and as measured by stress for rupture at l,350 F. in 100 hours should be 10,000 psi minimum.
- hardness that at l,400 F. should be at least 90 Brinell, and at room temperature should be at least 27 Rockwell C.
- the oxidation resistance as measured by weight loss in grams per square decimeter per -hour (g/dmlhr),
- the preferred steel is of substantially the composition 2l%Cr-5%Ni-7%Mn- 0.2%C-0.2%N-(0-0.2)%Cb-Fe.
- the steel of the invention preferably contains columbium in amount of 0.05 to 0.2%. 1
- the steel of the invention is of a balanced composition which is extremely critical with respect to the limits for each of the essential elements above specified. That is to say, our investigations have shown that the cold formability and other property requirements above stated, are obtained by so balancing the composition that the steel is completely austenitic or substantially so'at room temperature. Our investigations have furtherestablished that the critical structure-property relationships of the steel can be obtained only by carefully balancing the Ni, Mn, C and N values of the austenite.
- the chromium content is set within critical limits of 19-23% and preferably '20.5-2l.5%, to assure adequate scale resistance and secondary hardening at service operating temperatures up to about l,400 F.
- the steel When aged at about l,300-l,400 F, the steel undergoes secondary or age-hardening by precipitation of carbides and nitrides, and also phosphides, if the steel contains anappreciable amount of phosphorous. i.e., in
- the sulphur content of the steel should not exceed about 0.1% and preferably should not exceed 0.04%.
- Silicon which is usually present as a residual element in these steels, may be employed in amounts up to about 1.0%, the preferred upper limit being about 0.5%, and should not exceed 0.20% where maximum oxidation resistance to leaded fuels is required.
- Neither high nickel nor nickel-plus-manganese is employed or required in applicants steel for imparting an austenitic structure, this being achieved more efficiently and cheaply by the relatively high contents of the interstitials, carbon and nitrogen.
- applicants steel differs fundamentally in this respect from low carbon austenitic steels of, for example, 0.05% max. carbon, which are strengthened exclusively by nitrogen additions, and which require a minimum of about 14% nickel plus'manganese for imparting a fully austenitic structure, and also a minimum of about 8% manganese for preventing ingot porosity.
- manganese is employed primarily for maintaining a high nitrogen' content in the steel as an austenitizing agent.
- compositions according to the following Table I were melted and thereafter tested as discussed below.
- Solution treatment 1 h at 2.050 F. water quenched.
- test data clearly demonstrates the critical effects of the as evidenced by the data for steels B53, B54 and 313-315 inc.
- the steels having area reductions of at least about 60% with low yield strengths were found most suitable as closely approximating the cold formability of type 305 stainless steel, the annealed properties of which are 37,000 psi yield and 85,000 psi tensile strength, with 55% elongation in 2 inches and 65% area reduction.
- the steels most closely approximating these values as regards low yield strength and high area reduction values are steels B42, B51, B53, B54 and 313-315 inc.
- only steels B53, B54 and 313-315 inc. of this group meet the combined minimum requirements as to creep strain and impact strength for valve applications although all are excellent steels for other applications.
- steel B-B42 inc., B54 and 313-315 inc. werefound to have corrosion rates of less than 60 g/dm IhL, and thus within the acceptable range for the ideal automotive valve steel in this respect. Hence all of steels B54 and 313-315 inc. met all of the minimum requirements for the ideal valve steel.
- silicon up to about 0.7% exerts very little influence on the mechanical properties of the steel, but above this results in loss of ductility in the solution treated conditions.
- the silicon content has a marked effect on the corrosion rate in molten lead oxide, tending toward a maximum at silicon contents centered about 0.5% Si, with reductions at higher and lower Si levels, but tending toward a minimum as the Si content approaches zero.
- the corrosion rate is well under the above spcified limit of 60 gldm lhr.
- Si contents of about 0.2% and under the corrosion rate for the steel of this invention is less than 20 g/dmlhr and compares favorably with the corrosion rates for the best of the prior art valve steels shown.
- the steels of the invention are cold formable into valves at room temperature, the required forming pressures are greatly reduced by preheating to about 450-l,600 F, i.e. below the recrystallization temperature, prior to forming, the preferred temperature range being about 1,200-1,300 F, which might properly be termed warm forming in contrast to the conventional hot forming of valve steels at a forging heat of about 1,9002,200 F.
- Steels according to the invention are preferably produced by melting the ingredients in the electric arc furnace, teeming in a molten state into ladles, followed by casting into ingot molds.
- the stripped ingots are reheated to about l,9002,200 F, and for valve applications, hot rolled into bars and air-cooled to room temperature.
- the bars are solution treated at 2,0502,l50 F, preferably 2,100 F, usually for about one hour or until allcarbides are in solution, and thereupon cooled to room temperature with sufficient rapidity, as by water quenching, to retain carbides in solution, in which state the hardness is about 1020 Re.
- the bar stock is then cut into lengths for valve components and cold or warm upset into valve shapes, the resultant hardness being about 4050 Rc.
- the valves are then stress-relieved at about 1,3001,400 F, preferably at 1,350" F, for about 2 hours and air cooled to room temperature, the resulperature.
- the carbon and nitrogen content of the applicants steel critically affects the microstructural changes accompanying aging and, hence, the mechanical properties of the aged steel.
- a total carbon plus nitrogen content of less than about 0.3% is insufficient to maintain a completely austenitic structure in these steels. Consequently, some delta ferrite is present in their microstructure after solution treatment.
- carbides precipitate preferentially within these ferrite bands leaving the austenite matrix relatively depleted of precipitate particles. Although this banding of the precipitate phase results in a high hardness which is stable at 1,350 F, it presents no obstacle to deformation by creep in the precipitate-poor austenite.
- a solution treated steel of the invention containing about 0.2% each of carbon and nitrogen is found to completely dissolve the carbide phase without introducing large amounts of high temperature ferrite.
- Table V gives the melting range and actual compositions of a series of production heats of steels according to the invention.
- tant hardness being at least Rc.
- the valves are The Table V steels were produced by air melting in placed in service in automobile engines having a seran electric arc furnace. The requisite interstitial radiationce temperature for exhaust valves of about 1,350 F. ment content of the alloy was derived from additions of While in service the valves undergo secondary or age high-carbon scrap or ferrochromium and high-nitrogen hardeni h as to maintain th room t at chromium, manganese or their ferroalloys. Columbium was added in the form of ferrocolumbium. The nominal hardness about 30 Rc.
- the most severe mechanical property requirement a cold forming valve steel must satisfy is the ability to resist further deformation by creep at the intended service temperature.
- the major alloy design problem is economically to utilize the residual strengthening resulting from the forming operation together with precipitation hardening at the service temperature to transform a steel having good cold forming characteristics at lower temperatures into one which will resist deformation at an intermediate temperature.
- the reduction in silicon content initiated in heat number 8,043,601 was designed to improve lead oxide corrosion resistance to the aforementioned value of 2 0 g/dm /hr.
- Copper, an austenite promoter, and the ferrite promoting element, molybdenum are the major residual elements and are present in roughly equivalent concentrations between 0.18 and 0.51%.
- Phosphorous is present in a narrow range between 0.028 and 0.038% and the S content ranges between 0.005 and 0.013%.
- Random checks show the Co content to be of the order of 0.07%. Important to the hot workability of the alloy are its Sn and Pb contents which have attained maximum values of 0.028 and 0.003%, respectively. Examination of Table V shows that the nominal 0.02% A1 content of the steel has actually been as high as 0.050% in heat number 8,054,313. Lastly, determinations of the O and B, made only in heat number 3,331,227, show these elements to be present in amounts of 0.003 and 0.002%, respectively.
- Table VI summarizes the tensile properties measured in samples of alloy heat number 3,331,227 after various processing options. perusal-of this table clearly shows formability properties of the, cold drawn and annealed alloy to exceed those of the hot rolled alloy annealed at the same temperature. In general, samples of the cold drawn alloy water quenched after .annealing for 30 minutes at 2,100" F exhibited the following nominal mechanical properties:
- An age hardenable, cold formable, austenitic alloy steel consisting essentially of: 19 to 23% chromium, 4.5 to 6.5% nickel, 6.5 to 8.0% manganese, 0 to 0.5% silicon, 0.20 to 0.25% each of carbon and nitrogen, up to 0.2% columbium, up to 0.04% each of phosphorous and sulphur, up-to 0.008% boron, and the balance iron, the carbon content being substantially equal to the nitrogen content, said steel having at room temperature, a Rockwell C hardnesses of under 20 as solution treated and quenched and in being deformable by upsetting and extrusion below its recrystallization temperature, and by a hardness of at least 35 Rockwell C as thereafter deformed and aged at about l,350 F., a hardness of at least 100 Brinell at l,400 F, and a creep deformation of under 0.6% when stressed at 10,000 psi for 100 hours at l,350 F.
- An age hardenable, cold formable alloy steel consisting essentially of about: 19 to 23% chromium, 4.0 to 6.5% nickel, 6.5 to 8.0% manganese, 0 to 1.0% silicon, 0.15 to 0.3% each of carbon and nitrogen, up to 0.2% columbium, 0 to 0.1% each of phosphorous and sulphur, up to 0.008% boron, and the balance iron, characterized by Rockwell C hardnesses of under 20 as solution treated at 2,050 F.
- An age hardenable, cold formable alloy steel consisting essentially of: 19 to 23% chromium, 4.0 to 6.5% nickel, 6.5 to 8.0% manganese, up to 0.7% silicon, 0.15 to 0.25% each of carbon and nitrogen, up to 02% 'columbium, up to 0.1% each of phosphorus and sulphur, up to 0.008% boron, and the balance iron, the carbon content of said steel being at least equal to the nitrogen content, said steel having at room temperature as solution treated at about 2,100 F. and quenched, a 0.2%
- An age hardenable, cold formable, austenitic alloy steel consisting. essentially of about: 20.5 to 21.5% chromium, 4.5 to 5.5% nickel, 7 to 8% manganese, up to 0.2% silicon, 0.15 to 0.25% each of carbon and nitrogen, up to 0.2% columbium, sulphur and phosphorous not over 0.04% each, up to 0.008% boron, and the balance iron, said steel as solution treated at 2,050 F i and quenched being extrudable and upsetable at temperatures of not over l,600 F., and by a Rockwell C hardness of at least 35 as thereafter cold reduced and aged at l,350 F., a Brinnel hardness of at least 100 at l,400 F. and having a corrosion loss in molten lead oxide of not over 20 gldm /hr. 1
- An age hardenable, cold formable, austenitic alloy steel consisting essentially of: 20.5 to 21.5% chromium, 4.5 to 5.5% nickel, 7 to 8% manganese, up to 0.5% silicon, 0.2 to 0.25% carbon, 0.2 to 0.25% nitrogen, up to 0.2% columbium, sulphur and phosphorous not over 0.04% each, up to 0.008% boron, and the balance iron, the carbon content being related to the nitrogen content in accordance with the ratio 1 S C/N s 1.2.
- An age hardenable, cold formable, austenitic alloy steel consisting essentially of: 20.5 to 21 .5% chromium, 4.5 to 5.5% nickel, 7 to 8% manganese, up to 0.9% silicon, 0.2 to 0.25% carbon, 0.2 to 0.25% nitrogen, 0.05 to 0.2% columbium, sulphur and phosphorous not over 0.04% each, up to 0.008% boron, and the balance iron, with carbon at least equal to the nitrogen content.
- An age hardenable, cold formable, austenitic alloy steel consisting essentially of about: 21% chromium, nickel, 7% manganese, up to 0.5% silicon, 0.2 to 0.25% carbon, 0.2 to 0.25% nitrogen, up to 0.2% columbium, sulphur and phosphorous not over 0.04% each, up to 0.008% boron, and the balance iron.
- lntemal combustion engine valves and valve components made of an age hardened alloy steel consisting essentially of about: 19-23% chromium, 4.06.5% nickel, 6.58.0% manganese, 0.l50.30% each of carbon and nitrogen, 0-l0% silicon, 0-O.2% columbium, 0-0.l% each of phosphorous and sulphur, balance iron, said steel having at room temperature, a Rockwell C hardness of at least 35, a Charpy V notch impact strength of at least 5 ft.lbs, a Brinnel hardness of at least at l,400 F.
- lntemal combustion engine valves and valve components made of an age hardened, austenitic, alloy steel consisting essentially of about: 20.5-21.5% chromium, 4.55.5% nickel, 7.08.0% manganese, O.200.25% each of carbon and nitrogen, the total carbon and nitrogen content being 0.40O.50%, 00.5% silicon, 0.05-0.20% columbium, 00.04% I each. of phosphorous and sulphur, balance iron, said steel having a Rockwell C hardness at room temperature of at least 35 Rockwell C, a Charpy V notch impact strength of at least 5 ft.lbs. and a Brinnel hardness of at least 100 at l,400 F.
Abstract
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Claims (17)
- 2. An age hardenable, cold formable alloy steel consisting essentially of: 19 to 23% chromium, 4.0 to 6.5% nickel, 6.5 to 8.0% manganese, up to 0.7% silicon, 0.15 to 0.25% each of carbon and nitrogen, up to 0.2% columbium, up to 0.1% each of phosphorus and sulphur, up to 0.008% boron, and the balance iron, the carbon content of said steel being at least equal to the nitrogen content, said steel having at room temperature as solution treated at about 2,100* F. and quenched, a 0.2% offset yield strength of not over 75,000 psi, a tensile elongation of at least 35%, an area reduction at least 50%, and in being deformable by upsetting and extrusion below its recrystallization temperature, and being hardenable up to at least 35 Rockwell ''''C'''' by deformation and aging at about 1,350* F, and by a Brinnel hardness as aged of at least 100 at 1,400* F.
- 3. An age hardenable, cold formable, austenitic alloy steel consisting essentially of: 19 to 23% chromium, 4.5 t0 6.5% nickel, 6.5 to 8.0% manganese, 0 to 0.5% silicon, 0.20 to 0.25% each of carbon and nitrogen, up to 0.2% columbium, up to 0.04% each of phosphorous and sulphur, up to 0.008% boron, and the balance iron, the carbon content being substantially equal to the nitrogen content, said steel having at room temperature, a Rockwell ''''C'''' hardnesses of under 20 as solution treated and quenched and in being deformable by upsetting and extrusion below its recrystallization temperature, and by a hardness of at least 35 Rockwell ''''C'''' as thereafter deformed and aged at about 1, 350* F., a hardness of at least 100 Brinell at 1,400* F, and a creep deformation of under 0.6% when stressed at 10,000 psi for 100 hours at 1,350* F.
- 4. An age hardenable, cold formable, austenitic alloy steel consisting essentially of: 19 to 23% chromium, 4.5 to 5.5% nickel, 6.5 to 8.0% manganese, up to 0.5% silicon, 0.15 to 0.3% each of carbon and nitrogen, the total carbon and nitrogen content being 0.4 to 0.5%, up to 0.2% columbium, up to 0.1% each of phosphorous and sulphur, up to 0.008% boron, and the balance iron, carbon being at least equal to the nitrogen content, said steel having at room temperature as solution treated and quenched, a 0.02% offset yield strength of not over 75 ksi, a tensile elongation of at least 50%, an area reduction of at least 50% and being extrudable and upsetable at temperature not exceeding 1,600* F, and in being age hardenable thence up to at least 35 Rockwell ''''C'''', said steel having a corrosion rate in molten lead oxide at 1,675* F. of less than 60 g/dm2/hr., and in a Brinnel hardness as aged of at least 100 at 1,400* F.
- 5. An age hardenable, cold formable, austenitic alloy steel consisting essentially of about: 20.5 to 21.5% chromium, 4.5 to 5.5% nickel, 7 to 8% manganese, up to 0.2% silicon, 0.15 to 0.25% each of carbon and nitrogen, up to 0.2% columbium, sulphur and phosphorous not over 0.04% each, up to 0.008% boron, and the balance iron, said steel as solution treated at 2,050* F and quenched being extrudable and upsetable at temperatures of not over 1,600* F., and by a Rockwell ''''C'''' hardness of at least 35 as thereafter cold reduced and aged at 1,350* F., a Brinnel hardnEss of at least 100 at 1,400* F. and having a corrosion loss in molten lead oxide of not over 20 g/dm2/hr.
- 6. An age hardenable, cold formable, austenitic alloy steel consisting essentially of: 20.5 to 21.5% chromium, 4.5 to 5.5% nickel, 7 to 8% manganese, up to 0.5% silicon, 0.2 to 0.25% carbon, 0.2 to 0.25% nitrogen, up to 0.2% columbium, sulphur and phosphorous not over 0.04% each, up to 0.008% boron, and the balance iron, the carbon content being related to the nitrogen content in accordance with the ratio 1 < or = C/N < or = 1.2.
- 7. An age hardenable, cold formable, austenitic alloy steel consisting essentially of: 20.5 to 21.5% chromium, 4.5 to 5.5% nickel, 7 to 8% manganese, up to 0.9% silicon, 0.2 to 0.25% carbon, 0.2 to 0.25% nitrogen, 0.05 to 0.2% columbium, sulphur and phosphorous not over 0.04% each, up to 0.008% boron, and the balance iron, with carbon at least equal to the nitrogen content.
- 8. An age hardenable, cold formable, austenitic alloy steel consisting essentially of about: 21% chromium, 5% nickel, 7% manganese, up to 0.5% silicon, 0.2 to 0.25% carbon, 0.2 to 0.25% nitrogen, up to 0.2% columbium, sulphur and phosphorous not over 0.04% each, up to 0.008% boron, and the balance iron.
- 9. Internal combustion engine valves and valve components made of an alloy steel according to claim 1.
- 10. Internal combustion engine valves and valve components made of an alloy steel according to claim 2.
- 11. Internal combustion engine valves and valve components made of an alloy steel according to claim 3.
- 12. Internal combustion engine valves and valve components made of an alloy steel according to claim 4.
- 13. Internal combustion engine valves and valve components made of an alloy steel according to claim 5.
- 14. Internal combustion engine valves and valve components made of an alloy steel according to claim 6.
- 15. Internal combustion engine valves and valve components made of an alloy steel according to claim 7.
- 16. Internal combustion engine valves and valve components made of an alloy steel according to claim 8.
- 17. Internal combustion engine valves and valve components made of an age hardened alloy steel consisting essentially of about: 19-23% chromium, 4.0-6.5% nickel, 6.5-8.0% manganese, 0.15-0.30% each of carbon and nitrogen, 0-10% silicon, 0-0.2% columbium, 0-0.1% each of phosphorous and sulphur, balance iron, said steel having at room temperature, a Rockwell ''''C'''' hardness of at least 35, a Charpy V notch impact strength of at least 5 ft.lbs, a Brinnel hardness of at least 100 at 1,400* F.
- 18. Internal combustion engine valves and valve components made of an age hardened, austenitic, alloy steel consisting essentially of about: 20.5-21.5% chromium, 4.5-5.5% nickel, 7.0-8.0% manganese, 0.20-0.25% each of carbon and nitrogen, the total carbon and nitrogen content being 0.40-0.50%, 0-0.5% silicon, 0.05-0.20% columbium, 0-0.04% each of phosphorous and sulphur, balance iron, said steel having a Rockwell ''''C'''' hardness at room temperature of at least 35 Rockwell ''''C,'''' a Charpy V notch impact strength of at least 5 ft.lbs. and a Brinnel hardness of at least 100 at 1,400* F.
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US18139971A | 1971-09-17 | 1971-09-17 |
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Cited By (8)
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US5257453A (en) * | 1991-07-31 | 1993-11-02 | Trw Inc. | Process for making exhaust valves |
US6755360B1 (en) * | 2001-03-01 | 2004-06-29 | Brunswick Corporation | Fuel injector with an improved poppet which is increasingly comformable to a valve seat in response to use |
US20040211411A1 (en) * | 1999-05-26 | 2004-10-28 | Boehringer Ingelheim Pharma Kg | Stainless steel canister for propellant-driven metering aerosols |
US20090142218A1 (en) * | 2007-11-29 | 2009-06-04 | Ati Properties, Inc. | Lean austenitic stainless steel |
US20090162238A1 (en) * | 2007-12-20 | 2009-06-25 | Ati Properties, Inc. | Corrosion resistant lean austenitic stainless steel |
US20090162237A1 (en) * | 2007-12-20 | 2009-06-25 | Ati Properties, Inc. | Lean austenitic stainless steel containing stabilizing elements |
US20090194175A1 (en) * | 2004-10-29 | 2009-08-06 | Metin Gerceker | Shut-off device and process for producing a shut-off device |
US8337749B2 (en) | 2007-12-20 | 2012-12-25 | Ati Properties, Inc. | Lean austenitic stainless steel |
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Cited By (22)
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US6635128B1 (en) | 1991-07-31 | 2003-10-21 | Trw Inc. | Work hardened poppet exhaust valve |
US5257453A (en) * | 1991-07-31 | 1993-11-02 | Trw Inc. | Process for making exhaust valves |
US20040211411A1 (en) * | 1999-05-26 | 2004-10-28 | Boehringer Ingelheim Pharma Kg | Stainless steel canister for propellant-driven metering aerosols |
US6983743B2 (en) | 1999-05-26 | 2006-01-10 | Boehringer Ingelheim Pharma Kg | Stainless steel canister for propellant-driven metering aerosols |
US6755360B1 (en) * | 2001-03-01 | 2004-06-29 | Brunswick Corporation | Fuel injector with an improved poppet which is increasingly comformable to a valve seat in response to use |
US20090194175A1 (en) * | 2004-10-29 | 2009-08-06 | Metin Gerceker | Shut-off device and process for producing a shut-off device |
US8858872B2 (en) | 2007-11-29 | 2014-10-14 | Ati Properties, Inc. | Lean austenitic stainless steel |
US20090142218A1 (en) * | 2007-11-29 | 2009-06-04 | Ati Properties, Inc. | Lean austenitic stainless steel |
US10370748B2 (en) | 2007-11-29 | 2019-08-06 | Ati Properties Llc | Lean austenitic stainless steel |
US9617628B2 (en) | 2007-11-29 | 2017-04-11 | Ati Properties Llc | Lean austenitic stainless steel |
US8313691B2 (en) | 2007-11-29 | 2012-11-20 | Ati Properties, Inc. | Lean austenitic stainless steel |
US8337749B2 (en) | 2007-12-20 | 2012-12-25 | Ati Properties, Inc. | Lean austenitic stainless steel |
US8337748B2 (en) | 2007-12-20 | 2012-12-25 | Ati Properties, Inc. | Lean austenitic stainless steel containing stabilizing elements |
US8877121B2 (en) | 2007-12-20 | 2014-11-04 | Ati Properties, Inc. | Corrosion resistant lean austenitic stainless steel |
US9121089B2 (en) | 2007-12-20 | 2015-09-01 | Ati Properties, Inc. | Lean austenitic stainless steel |
US9133538B2 (en) | 2007-12-20 | 2015-09-15 | Ati Properties, Inc. | Lean austenitic stainless steel containing stabilizing elements |
US20090162237A1 (en) * | 2007-12-20 | 2009-06-25 | Ati Properties, Inc. | Lean austenitic stainless steel containing stabilizing elements |
US9624564B2 (en) | 2007-12-20 | 2017-04-18 | Ati Properties Llc | Corrosion resistant lean austenitic stainless steel |
US9822435B2 (en) | 2007-12-20 | 2017-11-21 | Ati Properties Llc | Lean austenitic stainless steel |
US9873932B2 (en) | 2007-12-20 | 2018-01-23 | Ati Properties Llc | Lean austenitic stainless steel containing stabilizing elements |
US10323308B2 (en) | 2007-12-20 | 2019-06-18 | Ati Properties Llc | Corrosion resistant lean austenitic stainless steel |
US20090162238A1 (en) * | 2007-12-20 | 2009-06-25 | Ati Properties, Inc. | Corrosion resistant lean austenitic stainless steel |
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