US3698889A - Non-magnetisable steel - Google Patents
Non-magnetisable steel Download PDFInfo
- Publication number
- US3698889A US3698889A US146508A US3698889DA US3698889A US 3698889 A US3698889 A US 3698889A US 146508 A US146508 A US 146508A US 3698889D A US3698889D A US 3698889DA US 3698889 A US3698889 A US 3698889A
- Authority
- US
- United States
- Prior art keywords
- steel
- corrosion
- magnetisable
- strength
- toughness
- 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
- 229910000831 Steel Inorganic materials 0.000 title abstract description 32
- 239000010959 steel Substances 0.000 title abstract description 32
- 238000005260 corrosion Methods 0.000 abstract description 10
- 229910052720 vanadium Inorganic materials 0.000 abstract description 7
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 abstract description 7
- 239000011572 manganese Substances 0.000 abstract description 6
- 230000007797 corrosion Effects 0.000 abstract description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 4
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052802 copper Inorganic materials 0.000 abstract description 4
- 239000010949 copper Substances 0.000 abstract description 4
- 229910052748 manganese Inorganic materials 0.000 abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 16
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 8
- 229910052804 chromium Inorganic materials 0.000 description 8
- 239000011651 chromium Substances 0.000 description 8
- 229910052742 iron Inorganic materials 0.000 description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000010791 quenching Methods 0.000 description 4
- 230000000171 quenching effect Effects 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 3
- 239000013535 sea water Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 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 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052758 niobium Inorganic materials 0.000 description 2
- 239000010955 niobium Substances 0.000 description 2
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052726 zirconium 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
Definitions
- This invention relates to a non-magnetisable steel also possessing high strength, low temperature-toughness, resistance to intercrystalline corrosion and to stress-corrosion in seawater, and which can be welded, particularly to marine construction requirements and in structural steels that have cold-toughness.
- Such properties are individually possessed by known steels.
- a steel containing 0.3 to 1% carbon, 7 to 17% manganese, 0.5 to 3% nickel, 0.3 to 2% copper, 0.3 to 1.5% silicon, 0.2 to 0.5% zirconium, balance iron and possibly additions of 0.5 to 18% chromium and/or 0.2 to 0.5% vanadium, tantalum or titanium has been described as suitable material for welded marine, mining and hoisting chains, and possessing a tensile strength of 130 kg./mm. with about 80% elongation and a notch impact strength exceeding 40 mkg./ sq. cm.
- a steel which has been described as suitable for welded structures exposed to brine, seawater, tap water, river water or condensation contains 0.05 to 1.2% carbon, 12 to 30% manganese, up to 1% silicon, balance iron and possibly up to 2% each of copper, molybdenum and nickel severally or in combination. However its strength and toughness at room temperature and lower temperatures, is poor.
- the present invention provides a steel which when suitably heat-treated has an improved strength and toughness at room and lower temperatures and comprises a non-magnetisable steel consisting essentially of:
- impurities and incidental inglr'ledients include chromium, nickel, phosphorus and sulp ur.
- the said vanadium content may be wholly or partly replaced by up to 1.5 wt. percent niobium.
- a preferred alloy according to the invention consists essentially of:
- the steels according to the invention After a heat treatment involving heating at about 1000" C. e.g. for about half an hour followed by quenching in water, the steels according to the invention, as well as being readily weldable, possessing good resistance to intercrystalline corrosion and stress corrosion in seawater, having a 0.2% yield strength of at least 35 kp./mm. particularly above 40 kp./mm. also have a low creep elongation at about room temperature, and therefore are particularly suitable as materials for marine construction.
- the steels may according to the invention also be used as structural steels that remain tough in cold conditions.
- the accompanying table shows the strength and toughness of steels according to the invention both at room temperature and at lower temperatures.
- the combination of the properties of steels according to the invention are superior than hitherto proposed steels which while possibly possessing superior individual properties, do so at the expense of at least some of the other stated properties.
- a non-magnetisable steel consisting essentially of:
- a non-magnetisable steel consisting essentially of:
- a steel consisting essentially of in wt. percent 0.54 C., 6 Si, 20.94 Mn, 0.26 V and 0.04 N, balance iron.
- a steel consisting essentially of in wt. percent 0.73 C, 1.49 Si, 20.35 Mn and 0.17 V, balance iron.
- a steel having an 0.2% yield strength of at least 35 kp./mm. and a notch impact strength at -196 C. of at least mkp./sq. cm. obtained by heating a steel according to claim 1 at about 1000 C. for about /2 hour, and quenching the heated heat treated steel in water.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Hard Magnetic Materials (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
A NON-MAGNETISABLE STEEL WHICH MAY BE WELDED AND WHICH MAY BE HEAT-TREATED TO BECOME RESISTANT TO INTERCRYSTALLINE CORROSION AND STRESS-CORROSION AND TO HAVE LOWTEMPERATURE TOUGHNESS, IS PROVIDED BY AN ALLOY STEEL CONTAINING MANGANESE WITH SMALL PROPORTION OF VANADIUM AND POSSIBLY COPPER.
Description
United States Patent ()1 fice Patented Oct. 17, 1972 US. Cl. 75-123 7 Claims ABSTRACT OF THE DISCLOSURE A non-magnetisable steel which may be welded and which may be heat-treated to become resistant to intercrystalline corrosion and stress-corrosion and to have lowtemperature toughness, is provided by an alloy steel containing manganese with small proportions of vanadium and possibly copper.
This invention relates to a non-magnetisable steel also possessing high strength, low temperature-toughness, resistance to intercrystalline corrosion and to stress-corrosion in seawater, and which can be welded, particularly to marine construction requirements and in structural steels that have cold-toughness.
Such properties are individually possessed by known steels. For example, a steel containing 0.3 to 1% carbon, 7 to 17% manganese, 0.5 to 3% nickel, 0.3 to 2% copper, 0.3 to 1.5% silicon, 0.2 to 0.5% zirconium, balance iron and possibly additions of 0.5 to 18% chromium and/or 0.2 to 0.5% vanadium, tantalum or titanium has been described as suitable material for welded marine, mining and hoisting chains, and possessing a tensile strength of 130 kg./mm. with about 80% elongation and a notch impact strength exceeding 40 mkg./ sq. cm. However such high tensile strength and toughness values can be achieved, if at all, only if the steel is alloyed with high proportions of chromium and of hardening elements. High chromium steels are unsuitable for use in conditions conducive to stress-corrosion as chromium unfavourably affects the sensitivity of the steel to stress-corrosion. A steel suitable for the purposes described should therefore contain no or a very small portion of chromium.
A steel which has been described as suitable for welded structures exposed to brine, seawater, tap water, river water or condensation contains 0.05 to 1.2% carbon, 12 to 30% manganese, up to 1% silicon, balance iron and possibly up to 2% each of copper, molybdenum and nickel severally or in combination. However its strength and toughness at room temperature and lower temperatures, is poor.
The present invention provides a steel which when suitably heat-treated has an improved strength and toughness at room and lower temperatures and comprises a non-magnetisable steel consisting essentially of:
Balance iron.
By the term consisting essentially used herein and in the claims hereof is meant that impurities and incidental ingredients may be present in such small proportions that they do not affect the stated properties thereof.
Particular examples of such impurities and incidental inglr'ledients include chromium, nickel, phosphorus and sulp ur.
In a modification of the steel according to the invention the said vanadium content may be wholly or partly replaced by up to 1.5 wt. percent niobium.
A preferred alloy according to the invention consists essentially of:
Wt. percent Carbon 0.45-0.65 Silicon 1.22.0 Manganese 19-22 Vanadium 0.15-0.3 Chromium 0-0.3 Nitrogen 0-0.2
Balance iron.
After a heat treatment involving heating at about 1000" C. e.g. for about half an hour followed by quenching in water, the steels according to the invention, as well as being readily weldable, possessing good resistance to intercrystalline corrosion and stress corrosion in seawater, having a 0.2% yield strength of at least 35 kp./mm. particularly above 40 kp./mm. also have a low creep elongation at about room temperature, and therefore are particularly suitable as materials for marine construction.
Owing to its satisfactory low temperature strength and useful notch impact strength of at least 10 mkp./sq. cm. at -l96 C., the steels may according to the invention also be used as structural steels that remain tough in cold conditions.
The accompanying table shows the strength and toughness of steels according to the invention both at room temperature and at lower temperatures. Generally the combination of the properties of steels according to the invention are superior than hitherto proposed steels which while possibly possessing superior individual properties, do so at the expense of at least some of the other stated properties.
All values were measured on heat treated test rods (30 min. at 1000 0., followed by water quenching).
What is claimed is:
1. A non-magnetisable steel, consisting essentially of:
Balance iron.
2. A steel according to claim 1, wherein the said vanadium content is wholly or partly replaced by up to 1.5 wt. percent niobium.
3. A non-magnetisable steel consisting essentially of:
Wt. percent Carbon 0.450.65 Silicon 1.2-2.0
Manganese 19-22 Vanadium 0. 15-03 Chromium -0.3 Nitrogen 0-0.3 Balance iron.
4. A steel consisting essentially of in wt. percent 0.54 C., 6 Si, 20.94 Mn, 0.26 V and 0.04 N, balance iron.
5. A steel consisting essentially of in wt. percent 0.73 C, 1.49 Si, 20.35 Mn and 0.17 V, balance iron.
6. A steel having an 0.2% yield strength of at least 35 kp./mm. and a notch impact strength at -196 C. of at least mkp./sq. cm. obtained by heating a steel according to claim 1 at about 1000 C. for about /2 hour, and quenching the heated heat treated steel in water.
4 7. A heat treated steel having an 0.2% yield strength of at least kp./mm. and a notch impact strength at -196 C. of at least 10 mkp./sq. 0111., obtained by heating a steel according to claim 2 at about 1000 C. for /2 hour and quenching the heated steel in Water.
References Cited UNITED STATES PATENTS Re. 24,431 2/1958 Jennings -126 V 1,310,528 7/1919 Hadfield 75123 IV 2,157,146 5/1939 Riedrich 75123 IV 3,250,612 5/1966 Roy 75-126 B HYLAND BIZOT, Primary Examiner US. Cl. X.R.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19702027676 DE2027676A1 (en) | 1970-06-05 | 1970-06-05 | Non-magnetizable steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3698889A true US3698889A (en) | 1972-10-17 |
Family
ID=5773127
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US146508A Expired - Lifetime US3698889A (en) | 1970-06-05 | 1971-05-24 | Non-magnetisable steel |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US3698889A (en) |
| BE (1) | BE767771A (en) |
| DE (1) | DE2027676A1 (en) |
| FR (1) | FR2095643A5 (en) |
| GB (1) | GB1294429A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4256516A (en) * | 1978-12-26 | 1981-03-17 | Nippon Kokan Kabushiki Kaisha | Method of manufacturing non-magnetic Fe-Mn steels having low thermal expansion coefficients and high yield points |
| US4514236A (en) * | 1982-03-02 | 1985-04-30 | British Steel Corporation | Method of manufacturing an article of non-magnetic austenitic alloy steel for a drill collar |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2509365A1 (en) * | 1981-07-10 | 1983-01-14 | Creusot Loire | AMAGNETIC ROD SHAFTS IN AUSTENITIC STEEL WITH STRUCTURAL CURING |
-
1970
- 1970-06-05 DE DE19702027676 patent/DE2027676A1/en active Pending
-
1971
- 1971-05-18 GB GB05553/71A patent/GB1294429A/en not_active Expired
- 1971-05-24 US US146508A patent/US3698889A/en not_active Expired - Lifetime
- 1971-05-26 FR FR7119002A patent/FR2095643A5/fr not_active Expired
- 1971-05-27 BE BE767771A patent/BE767771A/en unknown
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4256516A (en) * | 1978-12-26 | 1981-03-17 | Nippon Kokan Kabushiki Kaisha | Method of manufacturing non-magnetic Fe-Mn steels having low thermal expansion coefficients and high yield points |
| US4373951A (en) * | 1978-12-26 | 1983-02-15 | Nippon Kokan Kabushiki Kaisha | Nonmagnetic steels having low thermal expansion coefficients and high yield points |
| US4514236A (en) * | 1982-03-02 | 1985-04-30 | British Steel Corporation | Method of manufacturing an article of non-magnetic austenitic alloy steel for a drill collar |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2095643A5 (en) | 1972-02-11 |
| GB1294429A (en) | 1972-10-25 |
| BE767771A (en) | 1971-10-18 |
| DE2027676A1 (en) | 1972-02-03 |
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