EP0136004A1 - Bainitische Stähle - Google Patents
Bainitische Stähle Download PDFInfo
- Publication number
- EP0136004A1 EP0136004A1 EP84305111A EP84305111A EP0136004A1 EP 0136004 A1 EP0136004 A1 EP 0136004A1 EP 84305111 A EP84305111 A EP 84305111A EP 84305111 A EP84305111 A EP 84305111A EP 0136004 A1 EP0136004 A1 EP 0136004A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- alloy steel
- weight percent
- steel
- railway
- bainitic
- 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.)
- Withdrawn
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 21
- 239000010959 steel Substances 0.000 title claims abstract description 21
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 12
- 230000009466 transformation Effects 0.000 claims abstract description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 8
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 6
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 6
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052796 boron Inorganic materials 0.000 claims abstract description 6
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 6
- 239000011651 chromium Substances 0.000 claims abstract description 6
- 229910052802 copper Inorganic materials 0.000 claims abstract description 6
- 239000010949 copper Substances 0.000 claims abstract description 6
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 6
- 239000011572 manganese Substances 0.000 claims abstract description 6
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 6
- 239000011733 molybdenum Substances 0.000 claims abstract description 6
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 229910052742 iron Inorganic materials 0.000 claims abstract description 4
- 229910001563 bainite Inorganic materials 0.000 claims abstract description 3
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 19
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 2
- 239000005864 Sulphur Substances 0.000 claims description 2
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 description 13
- 229910000617 Mangalloy Inorganic materials 0.000 description 4
- 229910000734 martensite Inorganic materials 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 239000003570 air Substances 0.000 description 2
- 238000005056 compaction Methods 0.000 description 2
- 238000005242 forging Methods 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000007704 transition Effects 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
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
Definitions
- This invention relates to alloy steels, and is particularly though not necessarily exclusively concerned with alloy steels for railway, tramway and travelling crane applications.
- the wheels of railway engines and rolling stock, tramcars, and travelling cranes to be formed from steel, with the wheel, or at least a rim portion on the wheel, formed from a tough, wear-resistant steel, but which at the same time must be capable of allowing relatively conventional forming techniques, such as forging and rolling, casting or compaction and fusion of particulate feedstock, to be employed.
- the object of the present invention is to provide an alloy steel capable of use in both cast and wrought forms that is both tough and wear resistant and hence capable of use in e.g. railway, tramway and travelling crane applications, such as in the production of, e.g., railway and the like points and crossings and is at the same time able to be welded direct to those steels normally used in the production of railway and the like rails, and in the production of wheels or rims for wheels.
- alloy steel comprises boron present and up to 0.01 Height percent, molybdenum 0.2 to 3.0 weight percent, manganese 0.3 to 3.0 weight percent, balance iron and incidental impurities, said alloy steel being a bainitic steel and having an austenite-to-bainite transformation temperature below 550°C.
- nickel is present in the amount up to 6 weight percent
- chromium is present in the amount up to 6 weight percent
- copper is present in the amount up to 6 weight percent.
- the alloy steel of the invention is a bainitic steel which preferably has a bainitic transformation temperature in the range 440°C to 470°C and still more preferably 460°C.
- the alloy steel of the invention is both wear and impact resistant and effectively combines the properties of toughness, ductility and fatigue resistance, and is therefore ideal as an alloy steel for use in the production of either cast or wrought railway points and crossings. More importantly such a bainitic steel is able to be welded not only to itself but direct to those steels, normally used in the production of railway and the like rails, and as its costs of production are not noticeably different from those in the production of austenitic manganese steel. In its application to railway or the like systems, the invention may afford reduced total costs by avoiding the'need for the separate production of a transition piece and by reducing the number of welding operations required to produce a railway or the like line system.
- a preferred alloy steel composition in accordance with the invention is as follows (weight percent), carbon 0.08, silicon 0.3, manganese 0.7, sulphur 0.01, phosphorous 0.01, molybdenum 0.5, boron 0.002, chromium 2.0, nickel 3.0, balance iron and incidental impurities.
- copper in the amount up to 2.00 weight percent may be included.
- the presence of molybdenum and boron at the levels given provides a bainitic steel capable of being hardened over a wide range of cooling rates, and by maintaining carbon at very low levels, there is provided improved weldability by reducing any tendency for the formation of brittle martensite.
- nickel in such steels improves noticeably its impact properties, and the inclusion of chromium is of considerable assistance in improving weldability by its depression of the bainitic transformation temperature to an extent greater than its suppression of the martensite temperature which results in the maintenance of a martensite temperature sufficiently high to avoid the production of brittle martensite during welding.
- manganese is an essential element, it should be kept low to assist weldability. Additions of copper increases the hardness and strength in the normalised condition and these properties can be further improved by additional heat treatment.
- the material of the invention is well suited to the production of wheels or the rims for wheels for railway engines and rolling stock, tramcars and travelling cranes, by providing those required properties of toughness and wear resistance, and allowing relatively conventional forming techniques to be employed.
- a wheel is formed by a rim portion with one or two flanges, with the rim portion attached to or integral with a thinner web or plate section.
- a boss or hub Centrally of the web or plate section is a boss or hub, which can be integral with the web or separate therefrom and suitable secured to the web or plate section, with the boss or hub machined or punched to provide a through-bore through which an axle can be inserted.
- either the rim alone, or the whole of the wheel is formed from the alloy steel as hereinbefore defined, by forging and/or rolling, by casting, or by compaction and fusion of particulate feedstock.
- such rims or wheels are heat treated by heating to above transformation temperature, with subsequent controlled cooling in air, oil, water or other suitable medium, and can be further heat treated by heating to a temperature below the transformation temperature and controlled cooling in air, oil, water or other suitable medium.
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)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8320622 | 1983-07-30 | ||
| GB838320622A GB8320622D0 (en) | 1983-07-30 | 1983-07-30 | Alloy steels |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0136004A1 true EP0136004A1 (de) | 1985-04-03 |
Family
ID=10546575
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP84305111A Withdrawn EP0136004A1 (de) | 1983-07-30 | 1984-07-27 | Bainitische Stähle |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0136004A1 (de) |
| GB (1) | GB8320622D0 (de) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2588570A1 (fr) * | 1985-09-19 | 1987-04-17 | Man Nutzfahrzeuge Gmbh | Procede pour la fabrication d'elements de construction en acier a haute resistance avec en meme temps une haute tenacite, ces pieces presentant lesdites proprietes meme apres une deformation thermique |
| EP0348633A1 (de) * | 1988-04-30 | 1990-01-03 | Qinghua University | Lufthärtende Stähle mit Zwei-Phasen-Mikrostruktur-Bainit-Martensit |
| DE3934435A1 (de) * | 1988-10-17 | 1990-04-19 | Rauma Repola Oy | Niederlegierter gussstahl |
| WO2001036698A1 (en) * | 1999-11-17 | 2001-05-25 | Dt Vyhybkárna A Mostárna, Spol. S R.O. | Steel for railway crossing points |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2513395A (en) * | 1946-07-18 | 1950-07-04 | United Steel Companies Ltd | Boron-treated molybdenum steel |
| US2798805A (en) * | 1954-09-03 | 1957-07-09 | United States Steel Corp | Wrought railroad wheels made of alloy steels |
| GB1020913A (en) * | 1961-11-29 | 1966-02-23 | Yawata Iron & Steel Co | Low-alloy tough steel |
| US3288600A (en) * | 1960-11-07 | 1966-11-29 | Armco Steel Corp | Low carbon, high strength alloy steel |
| US3303061A (en) * | 1964-05-07 | 1967-02-07 | American Metal Climax Inc | Bainitic iron alloys |
| FR2200847A5 (en) * | 1972-05-04 | 1974-04-19 | Ugine Aciers | Heat-treatable, surface-hardenable gear steel - containing carbon, silicon, manganese, chromium, molybdenum, and boron, and opt aluminium, vanadium, niobium, titanium, or nickel |
| FR2211531A1 (de) * | 1972-12-20 | 1974-07-19 | Bethlehem Steel Corp |
-
1983
- 1983-07-30 GB GB838320622A patent/GB8320622D0/en active Pending
-
1984
- 1984-07-27 EP EP84305111A patent/EP0136004A1/de not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2513395A (en) * | 1946-07-18 | 1950-07-04 | United Steel Companies Ltd | Boron-treated molybdenum steel |
| US2798805A (en) * | 1954-09-03 | 1957-07-09 | United States Steel Corp | Wrought railroad wheels made of alloy steels |
| US3288600A (en) * | 1960-11-07 | 1966-11-29 | Armco Steel Corp | Low carbon, high strength alloy steel |
| GB1020913A (en) * | 1961-11-29 | 1966-02-23 | Yawata Iron & Steel Co | Low-alloy tough steel |
| US3303061A (en) * | 1964-05-07 | 1967-02-07 | American Metal Climax Inc | Bainitic iron alloys |
| FR2200847A5 (en) * | 1972-05-04 | 1974-04-19 | Ugine Aciers | Heat-treatable, surface-hardenable gear steel - containing carbon, silicon, manganese, chromium, molybdenum, and boron, and opt aluminium, vanadium, niobium, titanium, or nickel |
| FR2211531A1 (de) * | 1972-12-20 | 1974-07-19 | Bethlehem Steel Corp |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2588570A1 (fr) * | 1985-09-19 | 1987-04-17 | Man Nutzfahrzeuge Gmbh | Procede pour la fabrication d'elements de construction en acier a haute resistance avec en meme temps une haute tenacite, ces pieces presentant lesdites proprietes meme apres une deformation thermique |
| GB2182675A (en) * | 1985-09-19 | 1987-05-20 | Man Nutzfahrzeuge Gmbh | A method of making components of bainitic steel |
| GB2182675B (en) * | 1985-09-19 | 1989-04-19 | Man Nutzfahrzeuge Gmbh | A method of making components of steel with high-strength and high toughness |
| EP0348633A1 (de) * | 1988-04-30 | 1990-01-03 | Qinghua University | Lufthärtende Stähle mit Zwei-Phasen-Mikrostruktur-Bainit-Martensit |
| DE3934435A1 (de) * | 1988-10-17 | 1990-04-19 | Rauma Repola Oy | Niederlegierter gussstahl |
| WO2001036698A1 (en) * | 1999-11-17 | 2001-05-25 | Dt Vyhybkárna A Mostárna, Spol. S R.O. | Steel for railway crossing points |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8320622D0 (en) | 1983-09-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Designated state(s): AT BE CH DE FR GB IT LI LU NL SE |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 19851204 |
|
| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: BROOK, RAYMOND Inventor name: CALLENDER, WILLIAM ROBERT Inventor name: SAWLEY, KEVIN JAMES |