US3928088A - Ferritic stainless steel - Google Patents
Ferritic stainless steel Download PDFInfo
- Publication number
- US3928088A US3928088A US414257A US41425773A US3928088A US 3928088 A US3928088 A US 3928088A US 414257 A US414257 A US 414257A US 41425773 A US41425773 A US 41425773A US 3928088 A US3928088 A US 3928088A
- Authority
- US
- United States
- Prior art keywords
- stainless steel
- ferritic stainless
- free
- percent
- set forth
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 40
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 60
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 30
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 27
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000011733 molybdenum Substances 0.000 claims abstract description 25
- 239000011651 chromium Substances 0.000 claims abstract description 24
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 23
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 22
- 239000011593 sulfur Substances 0.000 claims abstract description 22
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 18
- 238000003754 machining Methods 0.000 claims abstract description 18
- 239000010935 stainless steel Substances 0.000 claims abstract description 9
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims abstract description 8
- 229910000734 martensite Inorganic materials 0.000 claims description 20
- 239000000203 mixture Substances 0.000 claims description 18
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 10
- 239000011572 manganese Substances 0.000 claims description 10
- 229910052748 manganese Inorganic materials 0.000 claims description 10
- 229910052710 silicon Inorganic materials 0.000 claims description 10
- 239000010703 silicon Substances 0.000 claims description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 16
- 230000007797 corrosion Effects 0.000 abstract description 15
- 238000005260 corrosion Methods 0.000 abstract description 15
- 239000012535 impurity Substances 0.000 abstract description 10
- 229910052742 iron Inorganic materials 0.000 abstract description 8
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052711 selenium Inorganic materials 0.000 abstract description 5
- 239000011669 selenium Substances 0.000 abstract description 5
- 229910045601 alloy Inorganic materials 0.000 description 15
- 239000000956 alloy Substances 0.000 description 15
- 230000007704 transition Effects 0.000 description 11
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 10
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 9
- 238000000137 annealing Methods 0.000 description 7
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 6
- 229910052698 phosphorus Inorganic materials 0.000 description 6
- 239000011574 phosphorus Substances 0.000 description 6
- 238000010791 quenching Methods 0.000 description 6
- 230000000171 quenching effect Effects 0.000 description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 5
- 238000007792 addition Methods 0.000 description 5
- 229910052802 copper Inorganic materials 0.000 description 5
- 239000010949 copper Substances 0.000 description 5
- 229910052759 nickel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 150000004767 nitrides Chemical class 0.000 description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 3
- 238000009863 impact test Methods 0.000 description 3
- 229910017604 nitric acid Inorganic materials 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 3
- 229910052721 tungsten Inorganic materials 0.000 description 3
- 239000010937 tungsten Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- 241001307210 Pene Species 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 239000012300 argon atmosphere Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- 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
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- 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
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
Definitions
- Cited incidental impurities characterized by a unique com- UNrrED STATES PATENTS bination of corrosion resistance and impact toughness, 1.956.645 5/l934 Langenberg 75/128 P plus free machinability in its preferred form. 2,384,565 9/[945 Schaufus 75/128 F 2.624.669 U195!
- This invention relates to ferritic stainless steel and, more particularly, to a ferritic stainless steel characterized by a unique combination of free machinability, corrosion resistance and toughness, the latter as measured by the V-notch Charpy impact test.
- Chromium steels modified with molybdenum and sulfur have hitherto been known.
- One such steel, here designated Alloy A for convenience, as published, contained, nominally, 18% chromium, 2% molybdenum and 0.20% sulfur. The remainder of Alloy A was 0.15% carbon, 0.30% silicon, 0.80% manganese, a maximum of 0.040% phosphorus, and the balance iron plus incidental impurities.
- Alloy B contained a maximum of 0.03% carbon, 17.50l9.50% chromium, a maximum of 1.50% manganese, a maximum of 1.0% silicon, a maximum of 0.04% phosphorus, 0.30-0.35% sulfur, 1.50-2.50% molybdenum, and the balance iron plus incidental impurities. Depending upon how such steels were produced they might contain up to about 0.040% nitrogen as a residual or incidental impurity even though none would be intentionally added. Alloys A and B are essentially the same and are commonly designated as 18 Cr-2 Mo stainless steel with additives for machinability.
- a ferritic stainless steel which in its annealed condition contains about 5-5() percent, preferably about 5 to 20 percent, highly tempered not fully decomposed martensite, from which such parts construction fasteners, valves for handling chemicals, machine shafts, food-processing equipment, screw machine parts and others can be made having good corrosion resistance and toughness and which preferably also have good machinability.
- our composition in its broad and preferred ranges contains in weight percent and the balance iron plus incidental impurities.
- Silicon is not an essential alloying addition to our alloy, but it is preferably used in the customary way for deoxidatiou. With less than 0.2% silicon, deoxidation is not usually carried far enough, and above about 0.6%, the silicon has the objectionable effect of forming undesired silicates and tends to raise the impact transition temperature of the composition. Thus, while up to about 1% silicon is tolerable, 02-06 percent best favors desired deoxidation and, by its effect on microstructure, optimum mechanical properties.
- Carbon in addition to being a strong austenite former, results in the formation of undesired grain boundary constituents and is, therefore, limited to no more than about 0.08 percent, preferably no more than about 0.06 percent.
- the minimum amount of nitrogen required in accordance with the present invention need not be adjusted. However, if the carbon content is reduced below about 0.01 percent, the minimum of nitrogen required should be adjusted upward from 0.06 percent by an equal amount.
- At least about 0.06% nitrogen is required in our composition and preferably at least 0.08 percent to provide the toughness and reduced impact transition temperature of the composition.
- impact transition temperature is meant the lowest temperature at which the impact specimens show predominantly ductile fracture.
- Up to about 0.20% nitrogen can be included to offset the maximum permissible amounts of the ferrite-forming elements which include chromium and molybdenum and thereby ensure the required minimum amount of martensite.
- Preferably 0.08-0.16% or, better yet, 0.08-0. 14% nitrogen is present with the larger amounts of nitrogen being balanced with the larger amounts of chromium and molybdenum so that at least the small but definite amount of martensite required, about 5-20 percent, is present when, following hot working, the material is to be annealed.
- the maximum amounts of carbon and nitrogen in the broad range are used together as much as about may be martensite following hot working.
- Manganese and sulfur (and/or selenium) work together and are added to provide the best free machinability in our composition.
- Manganese in excess of about 2.5 percent does not contribute significantly to free machinability.
- manganese is limited to no more than about 2.2 percent, and best results are provided with about l.72.2% manganese.
- sulfur is not present in sufficient quantity to prevent the formation of long stringy chips which tend to clog the machine and cause it to wear excessively. Therefore, at least 0. [5% sulfur and preferably about 0.250.40 percent is included for best results. Above about 0.50 percent, not enough improvement is obtained to offset the accompanying disadvantages to warrant further additions of sulfur.
- Chromium and molybdenum primarily contribute to the corrosion resistance of our composition and, as ferrite formers, work to insure an essentially single phase ferritic microstructure in our composition in its annealed and quenched condition. To this end, both chromium and molybdenum are limited to the critical ranges indicated. To provide the desired resistance to corrosion in oxidizing media, at least about l7.5% chromium is required. Above about 19.5% chromium, insufficient improvement in corrosion resistance is obtained, and larger additions of chromium are not warranted. Beyond that, increasing chromium above 19.5 percent objectionably affects the impact transition temperature by causing it to rise, and also increases the tendency toward 885F embrittlement. Best results are obtained with about l8.0 to 19.0% chromium.
- Our alloy is prepared and shaped using customary metallurgical practices suitable for the making and shaping of ferritic stainless steel containing about 18% chromium.
- Hot working is carried out at about l,800 to 2,200F, preferably between about l,900 to 2,lF, the higher hot working temperature, e.g., from about l,950 to 2,200F being best suited for initially breaking down the composition containing the larger amounts of nitrogen.
- the shapes are cooled in air, and some martensite is formed, but at a temperature (M,,) below l,000F with the result that the intermetallic phases, e.g., nitrides and carbides are not formed, the carbon and nitrogen being retained in solution in the martensite (body centered tetragonal) formed from the austenite which had been present at the hot work temperature.
- the material is heat treated by annealing at about l,200 to l,6()0F, preferably between about l,300 to l,500F, and better yet between about l,400 to l,500F.
- the parts are held at the annealing temperature for up to about 4 hours, shorter times of 1 to 2 hours or less being preferred.
- the martensite is seen as highly tempered, not fully decomposed martensite.
- highly tempered, not fully, that is partially, decomposed martensite is meant the ferritic structure obtained by quenching from the annealing temperature and in which no trace of the acicular structure characteristic of tempered martensite can be found, but the relatively fine nitrides remain to identify the prior location of tempered martensite.
- an excessively high annealing temperature leads to undesired agglomeration of the nitrides and other intermetallic phases that may be present.
- quenching following annealing is carried out more rapidly than can be done in air except for relatively small cross-sections or for parts containing the larger amounts of nitrogen with or without the larger amounts of carbon contemplated herein.
- quenching should be sufficiently rapid to prevent or minimize precipitation of undesired phases, e.g., a plate-like nitride, in the grain boundaries.
- Examples l-6 prepared as small experimental heats are illustrative of our invention and had the composition indicated in Table l with the balance iron and incidental impurities which included small amounts of but less than 0.005% phosphorus, less than 0.2% nickel, and less than 0.2% copper.
- Examples l-6 were melted under an argon atmosphere to facilitate controlling the nitrogen content for experimental purposes.
- Examples l to 2 were poured and cast as ingots from the same heat, but with added carbon in Example 2.
- Examples 3 and 6 and Examples 4 and 5 were formed from split heats, the variation between Examples 3 and 6 being in the nitrogen content and between Examples 4 and 5 being in the carbon content.
- the machinability of the specimens of each of the examples as annealed and quenched was determined as the average depth of penetration in inches into the specimens under carefully controlled conditions. While there is no generally accepted standard for measuring machinability, the free machining values were obtained by measuring the depth of penetration into the specimens by a quarter-inch drill in a time interval of seconds with the drill rotating at or very close to 670 r.p.m. under constant torque. Before the start of each drilling operation, the drill mounted in a conventional drill press was brought against the surface of the specimen where it was maintained by a constant weight of 100 pounds. The results of the tests are recorded in Table IV under drill penetration (DRILL PENE.) and each is an average of two sets of 3 hole tests. The carbon and nitrogen contents are included for easy reference.
- Example 2 was found to be at about ll0F
- Example 4 it was found to be about room temperature (72F)
- Alloy C it was found to be at about F.
- manganese and sulfur become optional and need not be present in amounts any greater than usual depending upon the manner in which the steel is made.
- manganese can be as low as 0.2 percent although even smaller amounts may be present when vacuum melting practices are used.
- sulfur would not exceed about 0.03 percent.
- the balance being essentially iron and incidental impurities, in which selenium can be substituted for all or part of the sulfur on a l for l basis and tungsten can be substituted for all or part of the molybdenum in the ratio of about 1.5% tungsten to l% molybdenum, and said stainless steel when annealed at about l,200-l,600F and quenched after having been hot worked from about l,8002,2()0F contains about to 50% highly tempered partially decomposed martensite free of acicular structure.
- Free-machining ferritic stainless steel as set forth in claim 2 containing about 0.06% maximum carbon, about l.72.2% manganese and about 0.08-0.l6% nitrogen.
- Free-machining ferritic stainless steel as set forth in claim 4 containing about l.7-2.2% molybdenum.
- Free-machining ferritic stainless steel as set forth in claim 7 containing about 5 to 20 percent highly tempered partially decomposed martensite.
- Free-machining ferritic stainless steel as set forth in claim 9 containing about 0.l300.l40% nitrogen.
- the stainless steel article set forth in claim I] formed from a ferritic stainless steel containing O.250.4% sulfur, about l.7-2 .2% manganese, about 0.08-0.l6% nitrogen, about l8.0-l9.0% chromium, about 1.7-2.2% molybdenum, a maximum of about 0.06% carbon, andabout 5 to 20 percent highly tempered, partially decomposed martensite free of acicular structure.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US414257A US3928088A (en) | 1973-11-09 | 1973-11-09 | Ferritic stainless steel |
| CA210,280A CA1031601A (fr) | 1973-11-09 | 1974-09-27 | Acier inoxydable ferritique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US414257A US3928088A (en) | 1973-11-09 | 1973-11-09 | Ferritic stainless steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3928088A true US3928088A (en) | 1975-12-23 |
Family
ID=23640641
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US414257A Expired - Lifetime US3928088A (en) | 1973-11-09 | 1973-11-09 | Ferritic stainless steel |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US3928088A (fr) |
| CA (1) | CA1031601A (fr) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4047981A (en) * | 1976-06-30 | 1977-09-13 | Armco Steel Corporation | Internally nitrided ferritic stainless steel strip, sheet and fabricated products and method therefor |
| US4219356A (en) * | 1977-09-20 | 1980-08-26 | Daido Tokushuko Kabushiki Kaisha | Machinable ferritic stainless steels |
| US4464207A (en) * | 1978-08-14 | 1984-08-07 | The Garrett Corporation | Dispersion strengthened ferritic stainless steel |
| US6921511B2 (en) * | 2001-11-26 | 2005-07-26 | Ugitech | Sulphur-containing ferritic stainless steel that can be used for ferromagnetic parts |
| CN108179360A (zh) * | 2018-01-30 | 2018-06-19 | 东北大学 | 一种锡铜协同作用的超纯铁素体不锈钢及其制备方法 |
| CN110106442A (zh) * | 2019-05-28 | 2019-08-09 | 南京钢铁股份有限公司 | 一种超细针状组织结构钢及其生产方法 |
| CN110343948A (zh) * | 2019-06-12 | 2019-10-18 | 鹰普（中国）有限公司 | 一种铁素体不锈钢cb30材料及其热处理工艺 |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1956645A (en) * | 1931-01-19 | 1934-05-01 | Us Pipe & Foundry Company | Ferrous alloy |
| US2384565A (en) * | 1940-12-13 | 1945-09-11 | Rustless Iron & Steel Corp | Alloy steel and articles |
| US2624669A (en) * | 1951-01-19 | 1953-01-06 | Union Carbide & Carbon Corp | Ferritic chromium steels |
| US2848323A (en) * | 1955-02-28 | 1958-08-19 | Birmingham Small Arms Co Ltd | Ferritic steel for high temperature use |
| US2905577A (en) * | 1956-01-05 | 1959-09-22 | Birmingham Small Arms Co Ltd | Creep resistant chromium steel |
| US3645722A (en) * | 1969-09-04 | 1972-02-29 | Carpenter Technology Corp | Free machining stainless steel alloy |
| US3799765A (en) * | 1972-02-29 | 1974-03-26 | Armco Steel Corp | Free-machining stainless steel |
-
1973
- 1973-11-09 US US414257A patent/US3928088A/en not_active Expired - Lifetime
-
1974
- 1974-09-27 CA CA210,280A patent/CA1031601A/fr not_active Expired
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1956645A (en) * | 1931-01-19 | 1934-05-01 | Us Pipe & Foundry Company | Ferrous alloy |
| US2384565A (en) * | 1940-12-13 | 1945-09-11 | Rustless Iron & Steel Corp | Alloy steel and articles |
| US2624669A (en) * | 1951-01-19 | 1953-01-06 | Union Carbide & Carbon Corp | Ferritic chromium steels |
| US2848323A (en) * | 1955-02-28 | 1958-08-19 | Birmingham Small Arms Co Ltd | Ferritic steel for high temperature use |
| US2905577A (en) * | 1956-01-05 | 1959-09-22 | Birmingham Small Arms Co Ltd | Creep resistant chromium steel |
| US3645722A (en) * | 1969-09-04 | 1972-02-29 | Carpenter Technology Corp | Free machining stainless steel alloy |
| US3799765A (en) * | 1972-02-29 | 1974-03-26 | Armco Steel Corp | Free-machining stainless steel |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4047981A (en) * | 1976-06-30 | 1977-09-13 | Armco Steel Corporation | Internally nitrided ferritic stainless steel strip, sheet and fabricated products and method therefor |
| US4219356A (en) * | 1977-09-20 | 1980-08-26 | Daido Tokushuko Kabushiki Kaisha | Machinable ferritic stainless steels |
| US4270950A (en) * | 1977-09-20 | 1981-06-02 | Daido Tokushuko Kabushiki Kaisha | Machinable ferrite stainless steels |
| US4464207A (en) * | 1978-08-14 | 1984-08-07 | The Garrett Corporation | Dispersion strengthened ferritic stainless steel |
| US6921511B2 (en) * | 2001-11-26 | 2005-07-26 | Ugitech | Sulphur-containing ferritic stainless steel that can be used for ferromagnetic parts |
| CN108179360A (zh) * | 2018-01-30 | 2018-06-19 | 东北大学 | 一种锡铜协同作用的超纯铁素体不锈钢及其制备方法 |
| CN110106442A (zh) * | 2019-05-28 | 2019-08-09 | 南京钢铁股份有限公司 | 一种超细针状组织结构钢及其生产方法 |
| CN110343948A (zh) * | 2019-06-12 | 2019-10-18 | 鹰普（中国）有限公司 | 一种铁素体不锈钢cb30材料及其热处理工艺 |
Also Published As
| Publication number | Publication date |
|---|---|
| CA1031601A (fr) | 1978-05-23 |
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