CN112267063A - Wear-resistant hot-rolled steel rail and production method thereof - Google Patents
Wear-resistant hot-rolled steel rail and production method thereof Download PDFInfo
- Publication number
- CN112267063A CN112267063A CN202010941578.2A CN202010941578A CN112267063A CN 112267063 A CN112267063 A CN 112267063A CN 202010941578 A CN202010941578 A CN 202010941578A CN 112267063 A CN112267063 A CN 112267063A
- Authority
- CN
- China
- Prior art keywords
- steel rail
- wear
- less
- equal
- rolled steel
- 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- Withdrawn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
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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/08—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling structural sections, i.e. work of special cross-section, e.g. angle steel
- B21B1/085—Rail sections
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/06—Thermomechanical rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/20—Temperature
Abstract
A wear-resistant hot-rolled steel rail and a production method thereof belong to the technical field of metallurgy. The steel rail comprises the following chemical components in percentage by mass: c: 0.81 to 0.86%, preferably 0.83 to 0.85%; si: 0.40-0.60%, preferably 0.50-0.60%; mn: 1.10-1.25%, preferably 1.18-1.25%; p is less than or equal to 0.020 percent, preferably P is less than or equal to 0.015 percent; s is less than or equal to 0.020%, and preferably S is less than or equal to 0.015%; cr:0.20 to 0.30%, preferably 0.22 to 0.30%; the balance being Fe and unavoidable impurities. The production method comprises the working procedures of converter smelting, LF refining, RH refining, continuous casting and rolling. The hardness of the tread of the steel rail is more than or equal to 310HB, and the tensile strength is more than or equal to 980MPa, so that the wear resistance requirement of a heavy-rail railway with a large-radius curve section or a straight section is completely met.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a wear-resistant hot-rolled steel rail and a production method thereof.
Background
Railway transportation is a relatively low cost mode of transportation. With the continuous increase of freight volume, railways at home and abroad are continuously developed towards heavy loading, large axle weight and high density. The steel rail is used as a key part of the railway, and higher requirements are put on the quality of the steel rail, particularly the steel rail is required to have higher wear resistance, namely higher hardness, so as to meet the requirement of over-fast abrasion of the steel rail under large transportation capacity.
At present, in order to improve the wear resistance of the steel rail, an online or offline heat treatment method is generally adopted for the pearlitic steel rail, so that the surface layer of a rail head obtains a lamellar pearlitic structure with a certain depth, and the wear resistance of the steel rail is further improved; or adding a certain amount of microalloy elements such as Nb, V, Cr and the like into the steel, and inhibiting the growth of austenite grains by the microalloy elements so as to finally obtain a fine pearlite structure. Chinese patent application CN107739983A discloses a hypereutectoid steel rail and a production method thereof, wherein a method of Nb and V microalloying, large compression ratio and online heat treatment process matching is adopted, and the tread hardness of the obtained steel rail is more than 420 HB. Although the hardness of the tread of the steel rail is higher, the invention has high cost and long process flow, and the obtained steel rail is more suitable for a small-radius curve segment with serious loss. For large radius or straight line segments, tread hardnesses greater than 420HB present an excess of mass.
Therefore, how to obtain a large-radius curve section or straight section steel rail with good wear resistance on the premise of low cost and low energy consumption is a problem which needs to be solved urgently at present.
Disclosure of Invention
In order to solve the technical problems, the invention provides a wear-resistant hot-rolled steel rail and a production method thereof. The invention adopts the following technical scheme:
a wear-resistant hot-rolled steel rail comprises the following chemical components in percentage by mass: c: 0.81 to 0.86%, preferably 0.83 to 0.85%; si: 0.40-0.60%, preferably 0.50-0.60%; mn: 1.10-1.25%, preferably 1.18-1.25%; p is less than or equal to 0.020 percent, preferably P is less than or equal to 0.015 percent; s is less than or equal to 0.020%, and preferably S is less than or equal to 0.015%; cr:0.20 to 0.30%, preferably 0.22 to 0.30%; the balance being Fe and unavoidable impurities.
Furthermore, the hardness of the tread of the steel rail is more than or equal to 310HB, and the tensile strength is more than or equal to 980 MPa.
The invention also provides a production method of the wear-resistant hot-rolled steel rail, which comprises the working procedures of converter smelting, LF refining, RH refining, continuous casting and rolling; in the rolling process, the compression ratio is more than or equal to 9.5.
Furthermore, the rolling process sequentially comprises the steps of heating, BD1 rough rolling, BD2 rough rolling, U1EU2 continuous rolling and Uf finish rolling, and the required section size can be obtained.
Further, in the heating step, the temperature of the soaking section is 1220-1280 ℃, and the heating time is 4-6 h; and (4) performing surface descaling after the continuous casting slab reaches the soaking temperature.
Furthermore, the starting rolling temperature of the BD1 rough rolling step is more than or equal to 1050 ℃, and the finishing rolling temperature of the Uf finish rolling step is more than or equal to 800 ℃.
The theoretical analysis of the component proportion and the process adjustment is as follows:
1. the design of high-carbon steel is adopted, the alloy consumption is reduced through carbon element reinforcement, and meanwhile, a proper amount of Cr reinforcing element is added, so that the hardness of the tread of the steel rail can meet the standard requirement of being more than or equal to 310HB without off-line or on-line quenching, the process flow is shortened, the energy is saved, the environment is protected, and the production efficiency is improved.
2. And a high-temperature heating process is adopted, the temperature of a soaking section is controlled to be 1220-1280 ℃, the heating time is controlled to be 4-6 hours, the Cr strong carbide forming elements are fully dissolved in austenite in a solid mode, the solid solution strengthening effect is achieved, and the tensile strength of the steel rail and the tread hardness index meet the requirements.
The invention has the beneficial effects that: the wear-resistant hot-rolled steel rail disclosed by the invention has the tensile strength of 980MPa or above and the tread hardness of 310HB or above, and completely meets the wear resistance requirement of a large-radius curve section or straight section heavy rail railway. Meanwhile, the macrostructure and the internal cleanliness of the hot-rolled steel rail meet the AREMA2011 standard requirement. The process has the advantages of no quenching procedure, short process flow, low cost, low energy consumption, energy conservation and environmental protection.
Detailed Description
The present invention will be described in further detail with reference to examples.
Examples 1 to 12
The wear-resistant hot-rolled steel rail comprises the following chemical components in percentage by mass: 0.81 to 0.86%, preferably 0.83 to 0.85%; si: 0.40-0.60%, preferably 0.50-0.60%; mn: 1.10-1.25%, preferably 1.18-1.25%; p is less than or equal to 0.020 percent, preferably P is less than or equal to 0.015 percent; s is less than or equal to 0.020%, and preferably S is less than or equal to 0.015%; cr:0.20 to 0.30%, preferably 0.22 to 0.30%; the balance being Fe and unavoidable impurities.
The production method of the wear-resistant hot-rolled steel rail comprises the working procedures of converter smelting, LF refining, RH refining, continuous casting and rolling, wherein the rolling working procedure has a compression ratio of more than or equal to 9.5. Selecting 380X 280mm or 325X 280mm rectangular billet for continuous casting; after the continuous casting is finished, heating the casting blank to a soaking section temperature of 1220-1280 ℃, and controlling the heating time to be 4-6 h; and (3) performing surface descaling after the continuous casting slab reaches the soaking temperature, sequentially performing BD1 rough rolling, BD2 rough rolling, U1EU2 continuous rolling and Uf finish rolling, and obtaining the required section size after rolling is finished.
The chemical components and the mass percentage of the wear-resistant hot-rolled steel rails in the examples 1 to 12 are shown in table 1, the control parameters of the working procedures are shown in table 2, and the mechanical properties are shown in table 3.
The macrostructure of the steel rail has no white spots, no shrinkage cavity, no central rail waist crack extending to the rail head or the rail bottom and the like, and the macrostructure completely meets the AREMA2011 standard requirement.
Table 1 chemical compositions and mass percentages (wt%) of the wear-resistant hot-rolled steel rails of the examples
In table 1, the balance is Fe and inevitable impurities.
TABLE 2 production procedure control parameters of the examples
TABLE 3 mechanical properties of the wear-resistant hot-rolled rails of the examples
As can be seen from Table 3, the tensile strength of the wear-resistant hot-rolled steel rail can reach 1000MPa or more, the tread hardness can reach 310HB or more, the macrostructure and the internal cleanliness of the steel rail meet the standard requirements, and the wear resistance requirements of large-radius curve sections or straight-line section heavy rail railways are completely met.
Claims (7)
1. The wear-resistant hot-rolled steel rail is characterized by comprising the following chemical components in percentage by mass: c: 0.81 to 0.86%, Si: 0.40-0.60%, Mn: 1.10 to 1.25 percent of Fe, less than or equal to 0.020 percent of P, less than or equal to 0.020 percent of S, 0.20 to 0.30 percent of Cr, and the balance of Fe and inevitable impurities.
2. The wear-resistant hot-rolled steel rail as claimed in claim 1, which is characterized by comprising the following chemical components in percentage by mass: c: 0.83-0.85%, Si: 0.50-0.60%, Mn: 1.18-1.25%, P is less than or equal to 0.015%, S is less than or equal to 0.015%, Cr: 0.22-0.30%, and the balance of Fe and inevitable impurities.
3. A wear-resistant hot-rolled steel rail according to claim 1 or 2, characterized in that the tread hardness is not less than 310HB and the tensile strength is not less than 980 MPa.
4. The production method of the wear-resistant hot-rolled steel rail is characterized by comprising the procedures of converter smelting, LF refining, RH refining, continuous casting and rolling; the rolling process sequentially comprises the steps of heating, BD1 rough rolling, BD2 rough rolling, U1EU2 continuous rolling and Uf finish rolling.
5. The method for producing the wear-resistant hot-rolled steel rail as claimed in claim 4, wherein the rolling process has a compression ratio of 9.5 or more.
6. The production method of the wear-resistant hot-rolled steel rail as claimed in claim 5, wherein in the heating step, the temperature of a soaking section is 1220-1280 ℃, and the heating time is 4-6 hours; and (4) performing surface descaling after the continuous casting slab reaches the soaking temperature.
7. The method for producing the wear-resistant hot-rolled steel rail as claimed in any one of claims 4 to 6, wherein the starting temperature of the BD1 rough rolling step is not less than 1050 ℃, and the finishing temperature of the Uf finish rolling step is not less than 800 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010941578.2A CN112267063A (en) | 2020-09-09 | 2020-09-09 | Wear-resistant hot-rolled steel rail and production method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010941578.2A CN112267063A (en) | 2020-09-09 | 2020-09-09 | Wear-resistant hot-rolled steel rail and production method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112267063A true CN112267063A (en) | 2021-01-26 |
Family
ID=74349962
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010941578.2A Withdrawn CN112267063A (en) | 2020-09-09 | 2020-09-09 | Wear-resistant hot-rolled steel rail and production method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112267063A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113058995A (en) * | 2021-03-31 | 2021-07-02 | 山东钢铁股份有限公司 | Hot rolling method of bar for high-wear-resistance medium-alloy large-size bucket teeth |
| CN113977211A (en) * | 2021-10-28 | 2022-01-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Medium-strength steel rail and production method thereof |
| CN115029506A (en) * | 2022-06-21 | 2022-09-09 | 包头钢铁（集团）有限责任公司 | Production method of carbon steel rail with American standard strength |
| WO2023077838A1 (en) * | 2021-11-03 | 2023-05-11 | 攀钢集团攀枝花钢铁研究院有限公司 | Medium-strength steel rail and production method therefor |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86106894A (en) * | 1985-10-24 | 1987-04-29 | 日本钢管株式会社 | Can prevent the anvil faced rail of unstable fracture expansion |
| CN1063916A (en) * | 1990-07-30 | 1992-08-26 | 伯林顿北方铁道公司 | High-strength, damage-resistant rail and manufacture method thereof |
| CN1140473A (en) * | 1994-11-15 | 1997-01-15 | 新日本制铁株式会社 | Perlite rail of high abrasion resistance and method of mfg. the same |
| CN1754973A (en) * | 2004-09-27 | 2006-04-05 | 铁道科学研究院 | Heat treating rail iron containing Cr |
| JP2008013811A (en) * | 2006-07-06 | 2008-01-24 | Nippon Steel Corp | Method for manufacturing pearlite-based rail having excellent toughness and ductility |
| CN101405419A (en) * | 2006-03-16 | 2009-04-08 | 杰富意钢铁株式会社 | High-strength pearlite rail with excellent delayed-fracture resistance |
| CN102985574A (en) * | 2010-06-07 | 2013-03-20 | 新日铁住金株式会社 | Steel rail and production method thereof |
| JP5867262B2 (en) * | 2012-04-23 | 2016-02-24 | 新日鐵住金株式会社 | Rail with excellent delayed fracture resistance |
| CN106636916A (en) * | 2016-11-30 | 2017-05-10 | 内蒙古包钢钢联股份有限公司 | Rolled steel for steel rails of America railways and production method of rolled steel |
| CN111187981A (en) * | 2020-02-13 | 2020-05-22 | 辽宁科技大学 | Production process of Nb-containing high-strength high-toughness hot-rolled steel sheet pile |
-
2020
- 2020-09-09 CN CN202010941578.2A patent/CN112267063A/en not_active Withdrawn
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86106894A (en) * | 1985-10-24 | 1987-04-29 | 日本钢管株式会社 | Can prevent the anvil faced rail of unstable fracture expansion |
| CN1063916A (en) * | 1990-07-30 | 1992-08-26 | 伯林顿北方铁道公司 | High-strength, damage-resistant rail and manufacture method thereof |
| CN1140473A (en) * | 1994-11-15 | 1997-01-15 | 新日本制铁株式会社 | Perlite rail of high abrasion resistance and method of mfg. the same |
| CN1754973A (en) * | 2004-09-27 | 2006-04-05 | 铁道科学研究院 | Heat treating rail iron containing Cr |
| CN101405419A (en) * | 2006-03-16 | 2009-04-08 | 杰富意钢铁株式会社 | High-strength pearlite rail with excellent delayed-fracture resistance |
| JP2008013811A (en) * | 2006-07-06 | 2008-01-24 | Nippon Steel Corp | Method for manufacturing pearlite-based rail having excellent toughness and ductility |
| CN102985574A (en) * | 2010-06-07 | 2013-03-20 | 新日铁住金株式会社 | Steel rail and production method thereof |
| JP5867262B2 (en) * | 2012-04-23 | 2016-02-24 | 新日鐵住金株式会社 | Rail with excellent delayed fracture resistance |
| CN106636916A (en) * | 2016-11-30 | 2017-05-10 | 内蒙古包钢钢联股份有限公司 | Rolled steel for steel rails of America railways and production method of rolled steel |
| CN111187981A (en) * | 2020-02-13 | 2020-05-22 | 辽宁科技大学 | Production process of Nb-containing high-strength high-toughness hot-rolled steel sheet pile |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113058995A (en) * | 2021-03-31 | 2021-07-02 | 山东钢铁股份有限公司 | Hot rolling method of bar for high-wear-resistance medium-alloy large-size bucket teeth |
| CN113977211A (en) * | 2021-10-28 | 2022-01-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Medium-strength steel rail and production method thereof |
| WO2023077838A1 (en) * | 2021-11-03 | 2023-05-11 | 攀钢集团攀枝花钢铁研究院有限公司 | Medium-strength steel rail and production method therefor |
| CN115029506A (en) * | 2022-06-21 | 2022-09-09 | 包头钢铁（集团）有限责任公司 | Production method of carbon steel rail with American standard strength |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110592355B (en) | Production method for reducing residual stress of heat-treated steel rail and steel rail obtained by production method | |
| CN112267063A (en) | Wear-resistant hot-rolled steel rail and production method thereof | |
| CN113789473B (en) | High-strength wear-resistant steel rail for small-radius curve of high-speed railway and production method thereof | |
| CN104195433B (en) | A kind of high-strength tenacity pearlite steel rail and production method thereof | |
| CN104480406A (en) | Low-alloy high-strength high-toughness steel plate and manufacturing method thereof | |
| CN114015945B (en) | Bainite steel rail with uniform hardness gradient and production method thereof | |
| CN110527910B (en) | Preparation method of corrosion-resistant nano pearlite steel rail containing rare earth Ce and Nb elements | |
| CN107058895A (en) | A kind of 1000MPa grades of hot dip galvanized dual phase steel and preparation method thereof | |
| CN102286701A (en) | Thick plate for ultra-high-intensity boat body structure and production method thereof | |
| CN110468347B (en) | Bainite steel rail with high strength and toughness and manufacturing method thereof | |
| CN111455269A (en) | Yield strength 960MPa grade very high strength marine steel plate and manufacturing method thereof | |
| CN110607488A (en) | Online heat treatment steel rail for high-speed railway and manufacturing method thereof | |
| CN113774283B (en) | High-toughness plastic steel rail for high-speed railway non-small-radius curve and production method thereof | |
| CN113637915B (en) | Nb-Ti-B microalloyed carburized gear steel and preparation method thereof | |
| CN108034886B (en) | Low-density light wear-resistant steel plate for dumper carriage and preparation method thereof | |
| CN107130172B (en) | 400HBW grades of Brinell hardness whole constrictive type high tenacity easily weld special thick wear-resisting steel plate and its manufacturing method | |
| CN101956141A (en) | Low-cost non-quenched and tempered high-strength wear-resistant steal plate with yield strength of 780 MPa grade and manufacturing method thereof | |
| CN113388784A (en) | Low-temperature-resistant non-quenched and tempered steel and preparation method and application thereof | |
| CN114908296A (en) | High-hardness online heat treatment steel rail and manufacturing method thereof | |
| CN109518090B (en) | Bainite steel for frog point rail and manufacturing method thereof | |
| CN114934231A (en) | High-manganese low-magnetism high-strength austenitic steel and manufacturing method thereof | |
| CN115505713B (en) | Heat treatment process for reducing residual stress of hundred-meter online heat-treated bainitic steel rail | |
| CN110578041B (en) | Corrosion-resistant superfine pearlite material added with rare earth Ce and Nb elements | |
| CN110387510B (en) | F-shaped rail for reducing friction loss of magnetic-levitation train and preparation method thereof | |
| CN114015944A (en) | Bainite steel rail with low rail top surface hardness fluctuation and production method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20210126 |
|
| WW01 | Invention patent application withdrawn after publication |