CN102925798A - Steel with yield strength of 450MPa for railway wagon parts and production method - Google Patents
Steel with yield strength of 450MPa for railway wagon parts and production method Download PDFInfo
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- CN102925798A CN102925798A CN2012104159747A CN201210415974A CN102925798A CN 102925798 A CN102925798 A CN 102925798A CN 2012104159747 A CN2012104159747 A CN 2012104159747A CN 201210415974 A CN201210415974 A CN 201210415974A CN 102925798 A CN102925798 A CN 102925798A
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Abstract
The invention discloses steel with yield strength of 450MPa for railway wagon parts. The steel comprises the following components in percentage by weight: 0.01-0.07% of C, not greater than 0.045% of Si, 0.45-1.15% of Mn, not greater than 0.025% of P, not greater than 0.010% of S, 0.01-0.08% of Nb, and 0.02-0.10% of V and 0.0030-0.010% of N, wherein the carbon equivalent (CEV) is controlled to be not greater than 0.42%. The production method comprises the following steps of: hot metal desulphurization, converter melting and continuous casting in batches; casting blank heating; subsection rolling; laminar cooling; coiling; and standby application. According to the invention, grains are refined, the precipitation is strengthened, and the addition of alloy elements is reduced on the basis of C-Mn and in combination with a matched process; the yield strength is not less than 450MPa, the tensile strength is not less than 550MPa, the elongation is not less than 20%, and the Charpy V-notch impact energy at -40 DEG C is not less than 70J; and meanwhile, the steel has the characteristics of better welding performance and low cost.
Description
Technical field
The present invention relates to the railway locomotive steel, refer to particularly railway truck's accessories yield strength 450MPa level steel and production method thereof.
Background technology
Along with China's expanding economy, heavy duty becomes the main direction of railway freight development, in order to reach the requirement of wagon heavy duty, lorry self the loss of weight development trend that is inevitable, for guaranteeing the lorry weight reduction, improve weight-carrying capacity, and operating safety, reliable, more and more higher with the highly malleablized index request of steel to the lorry component, the lorry component also have very high requirement as weldment to the welding property of steel simultaneously.At present, China railways lorry component are 235～345MPa level with the yield strength rank of steel, and for satisfying the growth requirement of China Railway, exploitation yield strength 450MPa level railway truck's accessories high-strength steel has urgent meaning.Simultaneously, consider the larger characteristics of the southern and northern temperature difference of China, for guaranteeing the lorry Operation safety, require steel plate in the time of-40 ℃, to have good low-temperature flexibility.
Easily welding railroad lorry component are that the China Railway Freight development is to the potential demand of steel with yield strength 450MPa grade high-strength steel, at present, Iron and Steel Enterprises in China does not also have special steel products, for this reason, develop this type of steel plate become adapt to the China Railway fast development must needs, also be the inevitable demand of the development of China Railway.
Summary of the invention
The object of the invention is to develop a kind of yield strength and be at least 450MPa, tensile strength is not less than 550MPa, and unit elongation A is at least 20%, and-40 ℃ of v-notch Charpy-V impact powers are at least 70J, welding property is good, railway freight-car parts steel and production method thereof that cost is low.
Realize the measure of above-mentioned purpose:
A kind of railway truck's accessories yield strength 450MPa level steel, its component and weight percent content are: C:0.01～0.07%, Si :≤0.045%, Mn:0.45～1.15%, P :≤0.025%, S :≤0.010%, Nb:0.01～0.08%, V:0.02～0.10%, N:0.0030～0.010%, surplus are Fe and inevitable impurity; And control carbon equivalent ce V=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15≤0.42%.
It is preferred: C:0.02～0.06%, Si :≤0.04%, Mn:0.55～1.10%, P :≤0.020%, S :≤0.008%, Nb:0.015～0.06%, V:0.03～0.90%, N:0.0030～0.0090%.
It is preferred: C:0.025～0.05%, Si:0.005～0.03%, Mn:0.75～1.05%, P :≤0.020%, S :≤0.006%, Nb:0.02～0.05%, V:0.04～0.08%, N:0.0035～0.0070%.
Produce a kind of railway truck's accessories method of yield strength 450MPa level steel, its step:
1) desulfurizing iron, converter smelting and continuous casting are in batch;
2) to the strand heating, heating and temperature control is at 1050～1150 ℃;
3) carry out segmentation rolling: control roughing start rolling temperature is at 1050～1150 ℃, and the roughing finishing temperature is at 1020～1120 ℃; Control finish rolling start rolling temperature is at 900～950 ℃, and the finish rolling finishing temperature is at 760～860 ℃.
4) carry out the laminar flow cooling, the control speed of cooling is at 25～45 ℃/s;
5) batch, the control coiling temperature is at 540～700 ℃;
6) stand-by.
Main alloy element content of the present invention is based on following principle:
C affects the topmost alloying element of steel welding property, and too high meeting significantly worsens the welding property of steel, and the welding property that the present invention has relatively high expectations is controlled lower C content, is designed to 0.01～0.07%.
Silicon addition is the important element that affects the Surfaces of Hot Rolled Strip quality, be to guarantee the good surface quality of steel plate, the Si content in the steel of the present invention is designed to≤and 0.05%.
Add Mn in the steel, not only can improve by the solution strengthening of Mn the intensity of steel, and can reduce the transformation temperature of steel, crystal grain thinning, the low-temperature flexibility of raising steel, steel Mn content of the present invention is designed to 0.45～1.15%.
P is one of impurity element in the low alloy steel, and when welding metal solidified, P promoted the generation of lower melting point inclusion, both easily produced heat cracking, increased again the low temperature crack sensitivity, the ductility of weld seam and toughness are degenerated, and P content is high, makes steel have obvious cold short tendency.P content control lower level in the steel of the present invention, P content≤0.025%.
S is the harmful element in the steel, and the sulfide inclusion of generation has a strong impact on the mechanical property of steel, therefore should be full of the S content that reduces in the steel, makes its content below 0.010%.
Nb, V are two topmost microalloy elements, improve intensity and the toughness of steel by crystal grain thinning, precipitation strength, and wherein V and N generate the VN precipitated phase, have strong precipitation strength effect, can significantly improve the intensity of steel.Nb content is designed to 0.01～0.08%, V content to be designed to 0.02～0.10%, N content is 0.0030～0.010% in the steel of the present invention.
[0016]The present invention compared with prior art owing to the low C-Mn alloy with cheapness is the basis, and passes through smelting technology and the microalloying of Clean Steel, make grain refining and precipitation strength, thereby improved intensity and the low-temperature flexibility of steel plate, avoided a large amount of interpolation alloying elements, provided cost savings; Its obdurability is fit to the China railways wagon heavy duty to the demand of high-strong toughness steel, its yield strength 〉=450MPa, tensile strength 〉=550MPa, even to 700MPa, unit elongation 〉=20% ,-40 ℃ of v-notch Charpy-V impact power 〉=70J have good welding property and characteristics with low cost simultaneously.
Embodiment
The below is described in detail the present invention:
Table 1 is the chemical composition value tabulation of various embodiments of the present invention and Comparative Examples;
Table 2 is the main technologic parameters tabulation of various embodiments of the present invention and Comparative Examples;
Table 3 tabulation that has been various embodiments of the present invention and Comparative Examples mechanical properties test result.
Various embodiments of the present invention are according to following steps production:
Its step:
1) desulfurizing iron, converter smelting and continuous casting are in batch;
2) to the strand heating, heating and temperature control is at 1050～1150 ℃;
3) carry out segmentation rolling: control roughing start rolling temperature is at 1050～1150 ℃, and the roughing finishing temperature is at 1020～1120 ℃; Control finish rolling start rolling temperature is at 900～950 ℃, and the finish rolling finishing temperature is at 760～860 ℃.
4) carry out the laminar flow cooling, the control speed of cooling is at 25～45 ℃/s;
5) batch, the control coiling temperature is at 540～700 ℃;
6) stand-by.
The chemical composition of table 1 various embodiments of the present invention steel and Comparative Examples (wt%)
The main technologic parameters value of table 2 various embodiments of the present invention steel and Comparative Examples
The mechanical property detected result tabulation of table 3 various embodiments of the present invention steel and Comparative Examples
The yield strength of various embodiments of the present invention steel is all greater than 450MPa as can be seen from Table 3, tensile strength is between 585～610MPa, unit elongation A is all greater than 20%,-40 ℃ of Charpy impact energies are all greater than 100J, the mechanical energy of different thickness gauge steel is good, especially has good tough coupling and low-temperature flexibility.
Above-described embodiment only exemplifies for the best, and is not to be restriction to embodiments of the present invention.
Claims (4)
1. a railway truck's accessories is with yield strength 450MPa level steel, its component and weight percent content are: C:0.01～0.07%, Si :≤0.045%, Mn:0.45～1.15%, P :≤0.025%, S :≤0.010%, Nb:0.01～0.08%, V:0.02～0.10%, N:0.0030～0.01%, surplus are Fe and inevitable impurity; And control carbon equivalent ce V=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15≤0.42%.
2. a kind of railway truck's accessories as claimed in claim 1 is characterized in that: C:0.02～0.06%, Si :≤0.04%, Mn:0.55～1.10%, P :≤0.020%, S :≤0.008%, Nb:0.015～0.06%, V:0.03～0.90%, N:0.0030～0.0090% with yield strength 450MPa level steel.
3. a kind of railway truck's accessories as claimed in claim 1 or 2 is characterized in that: C:0.025～0.05%, Si:0.005～0.03%, Mn:0.75～1.05%, P :≤0.020%, S :≤0.006%, Nb:0.02～0.05%, V:0.04～0.08%, N:0.0035～0.0070% with yield strength 450MPa level steel.
4. produce a kind of railway truck's accessories claimed in claim 1 method of yield strength 450MPa level steel, its step:
1) desulfurizing iron, converter smelting and continuous casting are in batch;
2) to the strand heating, heating and temperature control is at 1050～1150 ℃;
3) carry out segmentation rolling: control roughing start rolling temperature is at 1050～1150 ℃, and the roughing finishing temperature is at 1020～1120 ℃; Control finish rolling start rolling temperature is at 900～950 ℃, and the finish rolling finishing temperature is at 760～860 ℃;
4) carry out the laminar flow cooling, the control speed of cooling is at 25～45 ℃/s;
5) batch, the control coiling temperature is at 540～700 ℃;
6) stand-by.
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| CN201210415974.7A CN102925798B (en) | 2012-10-26 | 2012-10-26 | Steel with yield strength of 450MPa for railway wagon parts and production method |
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| CN102925798B CN102925798B (en) | 2014-07-02 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105274430A (en) * | 2015-09-30 | 2016-01-27 | 唐山钢铁集团有限责任公司 | Production method of ultra-thin specification hot rolling punching steel with tensile strength of 390-510 MPa |
| CN108486473A (en) * | 2018-05-14 | 2018-09-04 | 武汉钢铁有限公司 | A kind of low yield strength ratio resisting sulfide stress corrosion 345MPa grade low-temp steel heavy plate for pressure vessels and preparation method thereof |
| CN112517639A (en) * | 2020-10-20 | 2021-03-19 | 包头钢铁（集团）有限责任公司 | Manufacturing method of 450MPa Nb-containing high-strength alloy steel |
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| WO2008108487A1 (en) * | 2007-03-08 | 2008-09-12 | Nippon Steel Corporation | High-strength hot-rolled steel plate excellent in low-temperature toughness for spiral pipe and process for producing the same |
| CN101724777A (en) * | 2008-10-21 | 2010-06-09 | 宝山钢铁股份有限公司 | Hot rolled wheel rim steel plate with tensile strength of 550MPa grade and manufacturing method thereof |
| CN101781737A (en) * | 2009-01-16 | 2010-07-21 | 宝山钢铁股份有限公司 | Marine 40kg heat mechanical control rolling thick plate steel and manufacturing method thereof |
| CN101928880A (en) * | 2009-06-23 | 2010-12-29 | 上海梅山钢铁股份有限公司 | High-strength and high-tenacity steel for power communication poles and processing method thereof |
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2012
- 2012-10-26 CN CN201210415974.7A patent/CN102925798B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008108487A1 (en) * | 2007-03-08 | 2008-09-12 | Nippon Steel Corporation | High-strength hot-rolled steel plate excellent in low-temperature toughness for spiral pipe and process for producing the same |
| CN101724777A (en) * | 2008-10-21 | 2010-06-09 | 宝山钢铁股份有限公司 | Hot rolled wheel rim steel plate with tensile strength of 550MPa grade and manufacturing method thereof |
| CN101781737A (en) * | 2009-01-16 | 2010-07-21 | 宝山钢铁股份有限公司 | Marine 40kg heat mechanical control rolling thick plate steel and manufacturing method thereof |
| CN101928880A (en) * | 2009-06-23 | 2010-12-29 | 上海梅山钢铁股份有限公司 | High-strength and high-tenacity steel for power communication poles and processing method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105274430A (en) * | 2015-09-30 | 2016-01-27 | 唐山钢铁集团有限责任公司 | Production method of ultra-thin specification hot rolling punching steel with tensile strength of 390-510 MPa |
| CN108486473A (en) * | 2018-05-14 | 2018-09-04 | 武汉钢铁有限公司 | A kind of low yield strength ratio resisting sulfide stress corrosion 345MPa grade low-temp steel heavy plate for pressure vessels and preparation method thereof |
| CN112517639A (en) * | 2020-10-20 | 2021-03-19 | 包头钢铁（集团）有限责任公司 | Manufacturing method of 450MPa Nb-containing high-strength alloy steel |
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| CN102925798B (en) | 2014-07-02 |
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Effective date of registration: 20170712 Address after: 430083 Qingshan District, Hubei, Wuhan factory before the door No. 2 Patentee after: Wuhan iron and Steel Company Limited Address before: 430080 Wuhan, Hubei Friendship Road, No. 999, Wuchang Patentee before: Wuhan Iron & Steel (Group) Corp. |