US3383203A - Non-magnetic steels - Google Patents
Non-magnetic steels Download PDFInfo
- Publication number
- US3383203A US3383203A US610009A US61000967A US3383203A US 3383203 A US3383203 A US 3383203A US 610009 A US610009 A US 610009A US 61000967 A US61000967 A US 61000967A US 3383203 A US3383203 A US 3383203A
- Authority
- US
- United States
- Prior art keywords
- steel
- magnetic
- steels
- austenitic
- impact strength
- 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 description 32
- 239000010959 steel Substances 0.000 title description 32
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 12
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 12
- 239000000203 mixture Substances 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 6
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- 229910052804 chromium Inorganic materials 0.000 description 6
- 239000011651 chromium Substances 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 6
- 229910052748 manganese Inorganic materials 0.000 description 6
- 239000011572 manganese Substances 0.000 description 6
- 229910052759 nickel Inorganic materials 0.000 description 6
- 229910052710 silicon Inorganic materials 0.000 description 6
- 239000010703 silicon Substances 0.000 description 6
- 229910052720 vanadium Inorganic materials 0.000 description 6
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 6
- 239000000956 alloy Substances 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 5
- 238000004881 precipitation hardening Methods 0.000 description 5
- 238000001556 precipitation Methods 0.000 description 3
- 238000005482 strain hardening Methods 0.000 description 3
- 238000000137 annealing Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- C22C38/40—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
Definitions
- the present invention relates to a non-magnetic steel having desirable properties, particularly high impact strength, and to a method of producing said non-magnetic steel. Such steel is used for, among other things, the manufacture of retaining rings used in the electrical industry.
- the steels consist essentially of carbon 0.50-0.80%, manganese 9.018.0%, silicon ODS-0.80%, chromium 20-60%, nickel 7.0-ll.0%, vanadium 0.60-1.0%, and the remainder iron.
- austenitic steels having both high tensile strength and high impact strength.
- the alloys have the following composition:
- the austenitic steels of desired composition were solution treated and precipitation hardened by (l) annealing at a temperature of about 1150 C. for
- the austenitic steels so treated were non-magnetic and had high tensile strengths and impact strengths greater than 5.5 kpm./crn.
- the yield point, 0' has been defined as the load at which a non-proportional elongation corresponding to 0.2% of the original length of the test bar takes place. It is stated in kp./mm. and has been determined in an entirely conventional way, see ISO Recommendation R82.
- the impact strength tests were carried out with so-called V test bars in Charpy equipment, in accordance with a procedure which conforms entirely to ISO Recommenda- TABLE II Type Composition, percent Yield point Impact of do strength steel 0 Si Mn Cr Ni V lip/mm. Kcv+20 0.,
- Steels having compositions that do not meet the com position requirements of this invention (such as those disclosed in Belgian Patent 518,985 and US. Patent 2,865,740), when subjected to solution treatment and precipitation hardening, are not converted into steels having the high impact strengths as the non-magnetic austenitic steels of this invention.
- a non-magnetic, austenitic steel having a high tensile strength and a high impact strength and having a composition consisting essentially of:
- composition consisting essentially of:
- a steel according to claim 2 which has an impact strength of at least 5.5 kpm./cm.
- a steel according to claim 2 which has an impact strength of 8.0 kpm./cm. and consists essentially of:
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Hard Magnetic Materials (AREA)
- Soft Magnetic Materials (AREA)
Description
United States Patent 3,383,203 NON-MAGNETIC STEELS Karl Giite Baggstriim, Karlskoga, Sweden, assignor to Aktiebolaget Bofors, Bofors, Sweden, a corporation of Sweden No Drawing. Continuation-impart of application Ser. No. 330,587, Dec. 16, 1963. This application Jan. 18, 1967, Ser. No. 610,009
Claims priority, application Sweden, Dec. 19, 1962, 13,711/62 6 Claims. (Cl. 75-128) ABSTRACT OF THE DISCLOSURE The present invention relates to a non-magnetic steel having desirable properties, particularly high impact strength, and to a method of producing said non-magnetic steel. Such steel is used for, among other things, the manufacture of retaining rings used in the electrical industry.
The steels consist essentially of carbon 0.50-0.80%, manganese 9.018.0%, silicon ODS-0.80%, chromium 20-60%, nickel 7.0-ll.0%, vanadium 0.60-1.0%, and the remainder iron.
The application is a continuation-in-part application based upon copending application Ser. No. 330,587 filed Dec. 16, 1963, now abandoned.
It is generally known that the non-magnetic, austenitic types of steel normally have a comparatively low tensile strength, and this, of course, limits the usefulness of such kinds of steel. When it has been desired to prepare a steel having both non-magnetic properties and a high tensile strength, austenitic types of steel were subjected to coldworking. However, such cold-Working requires much skill and experience, and there is still always some uncertainty in regard to the uniformity of the properties of the product. Moreover, if large units of steel are to be coldworked, special expensive machinery is required.
Studies in this field have therefore been directed toward eliminating cold-working, and through suitable heat treatment, consisting of solution treatment and precipitation hardening of certain alloys, considerable improvements have been obtained so as to obtain nonmagnetic steel of high tensile strength. However, all alloys hitherto known which have been subjected to this treatment have had poor impact strength.
In the following Table I, information is given about a number of alloys which, after solution treatment and precipitation hardening, have shown a high tensile strength, as measured by the yield point, but poor impact strength.
3,383,203 Patented May 14, 1968 tion R148. The impact strength was determined at +20 C. and the results are stated in kpm./cm.
It is accordingly an object of the present invention to provide a non-magnetic, austenitic steel having high tensile strength and high impact strength.
It is a further object of this invention to provide austenitic steels of specified composition which, when subjected to suitable treatment comprising solution and precipitation hardening will be changed into non-magnetic,
austenitic steels having both high tensile strength and high impact strength.
These and further objects of the invention will become apparent from the following description.
I have discovered that the objects of this invention can be achieved by subjecting alloys of the following composition:
Percent Carbon 0.50-0.80 Silicon 0.05-0.80 Manganese 9.0-l8.0 Chromium 2.0-6.0 Nickel 7.0-ll.0 Vanadium 0.60-l.0
and the remainder iron, together with the usual impurities in this type of steel, to solution treatment and precipitation hardening.
Preferably, the alloys have the following composition:
Percent Carbon 0.60-0.70 Silicon 0.05-0.50 Manganese 9.0-13.0 Chromium 4.0-5.0 Nickel 8.0l0.0 Vanadium 0.70-0.95
and the remainder iron, together with the usual impurities in this type of steel.
The austenitic steels of desired composition were solution treated and precipitation hardened by (l) annealing at a temperature of about 1150 C. for
about one hour,
(2) quenching in Water,
(3) annealing at a temperature of about 650 C. for
about 8 to 10 hours, and
(4) cooling in air.
The austenitic steels so treated were non-magnetic and had high tensile strengths and impact strengths greater than 5.5 kpm./crn.
Some examples of steel according to the present invention are shown in the following Table II.
The yield point, 0' has been defined as the load at which a non-proportional elongation corresponding to 0.2% of the original length of the test bar takes place. It is stated in kp./mm. and has been determined in an entirely conventional way, see ISO Recommendation R82. The impact strength tests were carried out with so-called V test bars in Charpy equipment, in accordance with a procedure which conforms entirely to ISO Recommenda- TABLE II Type Composition, percent Yield point Impact of do strength steel 0 Si Mn Cr Ni V lip/mm. Kcv+20 0.,
lrprn/cm.
H; 0.6 0.10 9.3 4.4 8.8 0.85 88.5 7.8 I 0.65 0.08 12.9 4.4 8.8 0.83 87.9 8.0 J 0.67 0.46 9.9 4.1 8.7 0.85 87.3 6.7 K 0. 69 0. 28 10. 4 4. 2 8. 7 0.86 92.2 5. 5
A comparison of the data in Tables I and II shows that non-magnetic, austenitic steels produced according to the invention, while having high tensile strength, also have greater impact strengths compared to the types of steels previously used in this connection.
Steels having compositions that do not meet the com position requirements of this invention (such as those disclosed in Belgian Patent 518,985 and US. Patent 2,865,740), when subjected to solution treatment and precipitation hardening, are not converted into steels having the high impact strengths as the non-magnetic austenitic steels of this invention.
What is claimed is:
1. A non-magnetic, austenitic steel having a high tensile strength and a high impact strength and having a composition consisting essentially of:
Percent Carbon 0.50-0.80
Silicon 0.05-0.80
Manganese 9.0-18.0 Chromium 2.0-6.0 Nickel 7.0-11.0 Vanadium 0.601.0
and the remainder iron.
2. A steel according to claim 1, wherein the composition consisting essentially of:
Percent Carbon 0.60-0.70 Silicon 0.05-0.50 Manganese 9.0-13.0 Chromium 4.0-5.0 Nickel 8.0-10.0 Vanadium 0.70-0.95
and the remainder iron.
. 4 3. A steel according to claim 2, which has an impact strength of at least 5.5 kpm./cm.
4. A steel according to claim 2, which has an impact strength of 8.0 kpm./cm. and consists essentially of:
Percent Carbon 0.65
Silicon 0.08
Manganese 12.9 Chromium 4.4
Nickel 8.8
Vanadium 0.83
Iron 72.3
5. A steel according to claim 1 which has been precipitation hardened.
6. A steel according to claim 2 which has been precipitation hardened.
References Cited UNITED STATES PATENTS HYLAND BIZOT, Primary Examiner. PAUL WEINSTEIN, Assistant Examiner.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE13711/62A SE303145B (en) | 1962-12-19 | 1962-12-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3383203A true US3383203A (en) | 1968-05-14 |
Family
ID=20297864
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US610009A Expired - Lifetime US3383203A (en) | 1962-12-19 | 1967-01-18 | Non-magnetic steels |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US3383203A (en) |
| CH (1) | CH442766A (en) |
| GB (1) | GB1060670A (en) |
| SE (1) | SE303145B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4216816A (en) * | 1977-11-16 | 1980-08-12 | Thermit Welding GB Limited | Aluminothermic welding of austenitic manganese steel |
| US4302248A (en) * | 1978-07-04 | 1981-11-24 | Kobe Steel, Limited | High manganese non-magnetic steel with excellent weldability and machinability |
| US4342593A (en) * | 1980-09-15 | 1982-08-03 | Abex Corporation | Castings |
| US4911884A (en) * | 1989-01-30 | 1990-03-27 | General Electric Company | High strength non-magnetic alloy |
| US20100272148A1 (en) * | 2009-04-23 | 2010-10-28 | Medtronic, Inc. | Multiple Use Temperature Monitor Adapter, System and Method of Using Same |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USD824677S1 (en) * | 2015-12-18 | 2018-08-07 | Colgate-Palmolive Company | Electric toothbrush |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE507591A (en) * | ||||
| BE507473A (en) * | ||||
| BE518985A (en) * | ||||
| CH318247A (en) * | 1952-08-22 | 1956-12-31 | Hadfields Limited | Austenitic steel |
| US2865740A (en) * | 1954-06-23 | 1958-12-23 | United States Steel Corp | Precipitation-hardening nonmagneticferrous alloys |
-
1962
- 1962-12-19 SE SE13711/62A patent/SE303145B/xx unknown
-
1963
- 1963-12-13 CH CH1536463A patent/CH442766A/en unknown
- 1963-12-18 GB GB50076/63A patent/GB1060670A/en not_active Expired
-
1967
- 1967-01-18 US US610009A patent/US3383203A/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE507591A (en) * | ||||
| BE507473A (en) * | ||||
| BE518985A (en) * | ||||
| CH318247A (en) * | 1952-08-22 | 1956-12-31 | Hadfields Limited | Austenitic steel |
| US2865740A (en) * | 1954-06-23 | 1958-12-23 | United States Steel Corp | Precipitation-hardening nonmagneticferrous alloys |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4216816A (en) * | 1977-11-16 | 1980-08-12 | Thermit Welding GB Limited | Aluminothermic welding of austenitic manganese steel |
| US4302248A (en) * | 1978-07-04 | 1981-11-24 | Kobe Steel, Limited | High manganese non-magnetic steel with excellent weldability and machinability |
| US4342593A (en) * | 1980-09-15 | 1982-08-03 | Abex Corporation | Castings |
| US4911884A (en) * | 1989-01-30 | 1990-03-27 | General Electric Company | High strength non-magnetic alloy |
| US20100272148A1 (en) * | 2009-04-23 | 2010-10-28 | Medtronic, Inc. | Multiple Use Temperature Monitor Adapter, System and Method of Using Same |
| US8926175B2 (en) | 2009-04-23 | 2015-01-06 | Medtronic, Inc. | Multiple use temperature monitor adapter, system and method of using same |
Also Published As
| Publication number | Publication date |
|---|---|
| CH442766A (en) | 1967-08-31 |
| GB1060670A (en) | 1967-03-08 |
| SE303145B (en) | 1968-08-19 |
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