CN103014506A - Low-alloy moderate strength steel product for steel rails - Google Patents
Low-alloy moderate strength steel product for steel rails Download PDFInfo
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- CN103014506A CN103014506A CN2012105894321A CN201210589432A CN103014506A CN 103014506 A CN103014506 A CN 103014506A CN 2012105894321 A CN2012105894321 A CN 2012105894321A CN 201210589432 A CN201210589432 A CN 201210589432A CN 103014506 A CN103014506 A CN 103014506A
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- moderate strength
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Abstract
The invention relates to a low-alloy moderate strength steel product for steel rails. The low-alloy moderate strength steel product is characterized by comprising the following components: 0.72-0.82wt% of carbon, 0.35-1.00wt% of silicon, 0.80-1.25wt% of manganese, 0.40-0.70wt% of chromium, 0.020wt% of phosphorus, 0.020wt% of sulfur, 0.005wt% of aluminium and the balance of iron and unavoidable impurities. The low-alloy moderate strength steel product has the advantages of reasonability in component proportion, low content of alloying elements and capability of meeting the using requirements of the curve and heavy load line steel rails. Compared with general hot rolling steel rails, the steel rails made of the steel product have the advantages of high strength and hardness.
Description
Technical field
The present invention relates to a kind of low-alloy medium tenacity rail special steel, belong to the metal material field that metallurgical industry is produced.
Background technology
Transportation by railroad high speed and heavy loading are its general objective that advances all the time.The height of heavy loading inevitable requirement rail is strengthened.The Mid-term and Long-term Plan of the Railway Network that State Council in 2004 approves will reach 100,000 kilometers to the year two thousand twenty china railway operation mileage.In the railway operation of China, not only the sharp radius curve section is occupied sizable proportion, and heavy-haul line and busy trunk lines are more and more.Therefore, develop as early as possible the hot rolled rail of high intensity levels to satisfy the demand of the heavy duty of transportation by railroad department, speed-raising, just become an important process of Rail Production research department.
Summary of the invention
The purpose of this invention is to provide a kind of low-alloy medium tenacity rail special steel that can satisfy little curve and heavy-haul line requirement.
Low-alloy medium tenacity rail special steel of the present invention, it is characterized in that: the composition of steel consists of: the carbon weight percentage is 0.72～0.82%, the silicon weight percentage is 0.35～1.00%, the manganese weight percentage is 0.80～1.25%, the weight of chromium percentage composition is 0.40～0.70%, and the phosphorus weight percentage is less than or equal to 0.020%, and the sulphur weight percentage is less than or equal to 0.020%, the aluminium weight percentage is less than or equal to 0.005%, and all the other are iron and inevitable impurity.
The mechanical property of described steel is: yield strength 〉=550MPa, tensile strength: 1010～1280MPa, elongation 〉=8%, hardness: 325～360HB.
Advantage of the present invention is: composition proportion is reasonable, and alloying element content is low, compares that general hot rolled rail intensity is high, hardness is high, can satisfy the service requirements of curve and heavy-haul line rail.
Embodiment
Through scientific and technical personnel's research with in the test of 25kg vacuum induction furnace, the composition range of designing steel grade is as shown in table 1.
The Composition Design of table 1 steel grade, w%
| C | Si | Mn | Cr | P、S | Al |
| 0.72～0.82 | 0.50～0.90 | 0.80～1.25 | 0.40～0.70 | ≤0.020 | ≤0.005 |
All the other are iron and inevitable impurity.
Technical process is: (casting blank specification is 280mm * 380mm) to converter smelting LF stove refining VD stove refining continuous casting.
THE INDUSTRIAL TRIAL 1 stove steel, concrete process parameter control is as follows:
1) converter production
The carbon content of converter terminal molten steel, phosphorus content and tapping temperature are as shown in table 2.
Table 2 steel grade Tapping Temperature of Bof
| The test grade of steel | Tapping temperature, ℃ | The tapping carbon content, % | The tapping phosphorus content, % |
| 1 # | 1630 | 0.10 | 0.020 |
2) the LF stove is produced
1
#The refining slag basicity that steel is corresponding is 3.1.
3) continuous casting production
Table 3 steel grade continuous casting superheating temperature and pulling rate control
| The test grade of steel | Superheating temperature, ℃ | Pulling rate, m/min |
| 1 # | 30 | 0.65 |
So far finished the bloom production of steel of the present invention, below for adopting the technique of described bloom production rail, technical process is: steel billet → process furnace heating → rolling.
4) steel rolling production
The steel billet start rolling temperature was 1080-1140 ℃ to steel billet greater than 3.5 hours heat-up time in process furnace.
5) end properties check
Mechanical properties test result and the requirement of table 4 finished product rail
| Steel grade | Yield strength, MPa | Tensile strength, MPa | Elongation, % | Tread hardness, HB |
| 1# | 650 | 1190 | 11.0 | 327 |
| The rail property requirement | ≥550 | 1010～1280 | ≥8 | 325～360 |
By as seen from Table 4,1 stove steel mechanical property of test satisfies the mechanical property requirements of design fully, so the design of steel grades is rational.
Claims (2)
1. low-alloy medium tenacity rail special steel, it is characterized in that: the composition of steel consists of: the carbon weight percentage is 0.72～0.82%, the silicon weight percentage is 0.35～1.00%, the manganese weight percentage is 0.80～1.25%, the weight of chromium percentage composition is 0.40～0.70%, and the phosphorus weight percentage is less than or equal to 0.020%, and the sulphur weight percentage is less than or equal to 0.020%, the aluminium weight percentage is less than or equal to 0.005%, and all the other are iron and inevitable impurity.
2. low-alloy medium tenacity rail special steel according to claim 1, it is characterized in that: the mechanical property of described steel is: yield strength 〉=550MPa, tensile strength: 1010～1280MPa, elongation 〉=8%, hardness: 325～360HB.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105894321A CN103014506A (en) | 2012-12-29 | 2012-12-29 | Low-alloy moderate strength steel product for steel rails |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105894321A CN103014506A (en) | 2012-12-29 | 2012-12-29 | Low-alloy moderate strength steel product for steel rails |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103014506A true CN103014506A (en) | 2013-04-03 |
Family
ID=47963616
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012105894321A Pending CN103014506A (en) | 2012-12-29 | 2012-12-29 | Low-alloy moderate strength steel product for steel rails |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103014506A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107299284A (en) * | 2017-05-27 | 2017-10-27 | 内蒙古包钢钢联股份有限公司 | Inexpensive anvil faced rail and its production technology |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001220651A (en) * | 2000-02-08 | 2001-08-14 | Nkk Corp | Pail excellent in heavy shelling damage resistance |
| CN1754973A (en) * | 2004-09-27 | 2006-04-05 | 铁道科学研究院 | Heat treating rail iron containing Cr |
| JP2010185106A (en) * | 2009-02-12 | 2010-08-26 | Jfe Steel Corp | Wear-resistant rail, and method for manufacturing the same |
-
2012
- 2012-12-29 CN CN2012105894321A patent/CN103014506A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001220651A (en) * | 2000-02-08 | 2001-08-14 | Nkk Corp | Pail excellent in heavy shelling damage resistance |
| CN1754973A (en) * | 2004-09-27 | 2006-04-05 | 铁道科学研究院 | Heat treating rail iron containing Cr |
| JP2010185106A (en) * | 2009-02-12 | 2010-08-26 | Jfe Steel Corp | Wear-resistant rail, and method for manufacturing the same |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107299284A (en) * | 2017-05-27 | 2017-10-27 | 内蒙古包钢钢联股份有限公司 | Inexpensive anvil faced rail and its production technology |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130403 |