CN1218115A - Low carbon and super low carbon copper and boron bainite steel - Google Patents
Low carbon and super low carbon copper and boron bainite steel Download PDFInfo
- Publication number
- CN1218115A CN1218115A CN97109312A CN97109312A CN1218115A CN 1218115 A CN1218115 A CN 1218115A CN 97109312 A CN97109312 A CN 97109312A CN 97109312 A CN97109312 A CN 97109312A CN 1218115 A CN1218115 A CN 1218115A
- Authority
- CN
- China
- Prior art keywords
- steel
- low
- carbon
- present
- low carbon
- 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.)
- Granted
Links
Abstract
A high-strength bainite steel features that in its design, low, even very low carbon content, low copper content and Nb-Ti-B composition are utilized, the Cu and B elements are used to promote the phase change of bainite, and epsilon-Cu and Nb-Ti are used for deposition educing to obtain high strength. It features excellent comprehensive performance including mechanical properties, cold or hot treating nature and weldability, simple process and low cost.
Description
The present invention relates to a kind of copper-boron is low-carbon (LC) and ULCB high-strength steel, belongs to low alloy steel and makes the field.
Before the present invention, just like the patent (TW258757 of steel connection application in the Taiwan; The contriver: JANG J etc.) " having the good weldability and the low manganese of erosion resistance is the production technique of ultra-low-carbon bainite steel (ULCB) ", use Mo-Ni-Nb system and obtain ultra-low-carbon bainite steel.Its weak point makes molten steel recarburization owing to smelt the affiliation that adds of back alloy at what in big production, therefore 0.02～0.05% carbon content is difficult to control, and success ratio is lower.In addition, the adding of alloys such as Mo, Ni is risen the cost value of steel, and not very good to the bainite transformation effect that promotes whole tissues, thereby the strength level of steel is not high.
And for example in the research paper that document (1903757 MA Accossion Number:199607-31-2238) U.S. Bcthlchcm Steel delivers about bainitic steel, the composition of relevant ultra-low-carbon bainite steel, its weak point is still carbon content and crosses lowly by 0.015～0.035%, controls aborning than difficulty.Secondly its high Cr (2.23%) or high Mo (2.35%) cause the cost of steel to improve, and too high Cr, Mo can cause the toughness of temper crack, reduction steel.
The objective of the invention is to invent a kind of novel bainite steel grade, make its cost that can reduce ultra-low-carbon bainite steel, be fit to big production operation, can reach intensity and the toughness that improves steel to add minimum, the most rational microalloy element again.
The present invention in order to achieve the above object, having designed a kind of brand-new copper-boron is low-carbon (LC) and ULCB high-strength steel, it is characterized in that the chemical ingredients (by weight percentage) of steel contains C:0.01～0.08, Si:0.1～0.5, Mn:0.5～2.0, Cu:0.05～0.5, Nb:0.01～0.07, Ti:0.005～0.04, B:0.0002～0.005, Al:0.005～0.08, P, S≤0.025.
Carbon content among the present invention is chosen in 0.01～0.08%, and carbon content makes the present invention and the external simple Ultra-low carbon of steel or only different fully for soft steel in this scope, crosses over the scope of Ultra-low carbon to low-carbon (LC) more flexibly.When C＜0.04%, there is not tendency of hardenability in the steel fully, be Ultra-low carbon (high-strength steel relatively).Even but the control of converter terminal carbon is very low in big production actually operating, after the adding alloy particularly adds manganeseirom, can make carbon go up 0.02%～0.03% again, therefore, difficult aborning control and smelting ultralow-carbon.Carbon content is crossed over the scope of Ultra-low carbon to low-carbon (LC), and the obdurability that so neither reduces the bainite steel plate is suitable for production operation again, improves its suitability and feasibility in big production.
Silicone content among the present invention is chosen in 0.1～0.5%, and Si mainly improves the intensity of steel with the solution strengthening form, but can not too high levels, in order to avoid reduce the toughness of steel.
Manganese content among the present invention is chosen in 0.5～2.0%, when carbon content low～during the Ultra-low carbon scope, it is particularly important that solution strengthening in the steel just seems, Mn is solution strengthening and the most important element of tensile strength that improves steel, especially Mn is that 1.3～1.8% o'clock Mn rise the tensile strength of steel significantly, therefore in Ultra-low carbon, high intensity type steel, generally improve the content of manganese, reach as high as 2%.
Copper content among the present invention is chosen in 0.05～0.5%, and the present invention is for copper boron is steel, and the precipitation of utilizing copper to generate ε-Cu when tempering (550～650 ℃) is separated out, and further strengthens matrix to obtain high strength.This tempering process is in holding stage after the hot continuous rolling production line upper steel plate curls can realize naturally; Because tempering process is simple, cost is low, and easy to implement in Heavy Plate Plant.The precipitation-hardening effect of Cu shows that ε-Cu separates out on dislocation, lath edge and subgrain boundary, pinning dislocation, intensity is increased.Containing on the bainite ferrite of Cu, having unusual high dislocation desity.Another effect of Cu can improve tendency of hardenability.
In addition, copper except that gaining in strength, also helps the acquisition good low-temperature toughness as alloying element, impels the generation of lath-shaped bainite, increases the antifatigue crack propagation ability of steel.Copper also has outstanding erosion resistance and inhibition hydrogen causes the i.e. effect of anti-HIC of crackle of inducing; this is owing to add the copper amount on the upper side during limit value; form the stable protective membrane of one deck on the surface of steel, can reduce the absorption of hydrogen, and add Cu and can make due to the reasons such as the shape of inclusion is controlled.
Therefore, add the needs that Cu not only can satisfy intensity, also provide multiple advantage for seeking multiple use.
In steel of the present invention, only add＜0.5% Cu, when CCT figure learns speed of cooling＞2 ℃/s, have only a small amount of pro-eutectoid phase ferrite in the steel, 850～720 ℃ of its transformetion ranges, and 650～550 ℃ of bainite transformation scopes; During speed of cooling＞4 ℃, all change bainite in the steel into.Compare with the ultra-low-carbon bainite steel that does not contain Cu, it needs speed of cooling＞6 ℃/s, could all realize bainitic transformations.The remarkable effect of Cu is the effect of direct promotion bainitic transformation, and this is to some Heavy Plate Plant, and the state of arts of rolling the postcooling underspeed is very suitable.
Only add low amount Cu＜0.5% in the steel of the present invention, can reduce and add other noble metal, this design not only can be played strengthening effect but also save alloy, reduce cost, and can satisfy the obdurability demand of civil engineering machinery, pipeline, boats and ships, maritime facilities and high-strength structural part.
The present invention adopts the compound adding method of Nb-Ti-B, Nb:0.01～0.07%, Ti:0.005～0.04%, B:0.0002～0.005%.
Boron is the strong perviousness element that improves, and under the very low situation of carbon amount, the adding of boron can more effectively suppress the forming core and the generation of proeutectoid ferrite.Under various conditions, boron directly influences γ-α phase transformation, and reduces recrystallization temperature, postpones austenitic recrystallize, because the non-equilibrium segregation of boron on austenite grain boundary, strongly inhibited γ-α phase transformation impels austenite to generate the bainite structure of tiny low-carbon (LC).
In the deformation of non-recrystallization zone, boron can gather partially on deformation border and subgrain, and along with the increase of boron content, deformation temperature descends, and can make more refinement of microstructure.When containing Nb and Ti simultaneously in the steel, the effect of B is more outstanding.Both change Nb+B in conjunction with more effective inhibition γ-α, and its principle is that the existence of Nb has suppressed Fe
23(CB)
6Separate out, increase the solid solution effect of boron, can make under lower speed of cooling and obtain bainite structure.And the adding of Ti by the Ti fix N, reduces B and N bonded chance, to increase the effect of solid solution boron.
Characteristics of the present invention utilize boron, copper to promote the adding of bainitic transformation element to strengthen to impel bainitic transformation strongly, but in order to promote and to guarantee that the useful effect of boron must add Nb, Ti with the fixed nitrogen element, further increases the effect of solid solution boron.
In addition, in order to increase the intensity of steel of the present invention, except that bainite is strengthened, also to adopt precipitation strength to obtain higher intensity.Therefore, in steel, add precipitation precipitation strength element nb, Ti, utilize the effect of Ti crystal grain thinning.The form that the adding of Ti is handled with the little Ti of the nineties in the world, promptly Ti≤0.04% can play effect, and is big for the intensity surplus capacity, the bainite class steel that unit elongation is inadequate slightly, Ti content can not be too high.The present invention adopts the compound adding of Nb-Ti-B, and is indispensable, and this makes steel of the present invention can not add V element.
P among the present invention, S≤0.025%, this is because S, P content in the steel must be controlled at lower scope, has only the smelting Clean Steel, could guarantee the performance of steel of the present invention.
Following the present invention will be described further in conjunction with the embodiments.Embodiment 1:
Smelting copper-boron of the present invention at Wuhan Iron and Steel Plant is low-carbon (LC) and ULCB high-strength steel, its actual constituent (by weight percentage) contains C:0.023, Si:0.32, Mn:1.47, P:0.016, S:0.004, Cu:0.1, Nb:0.042, Ti:0.02, B:0.0016, rolls into the 6mm steel plate.Its mechanical property: yield strength is that 570MPa, tensile strength are 635MPa, elongation δ
5Be 22%, ballistic work CVN-40 ℃ also can accomplish that for the wide cold bending test of 124J, 20mm～100mm (d=flexual center diameter, a=sample thickness) d=0,180 ° are intact for 183J ,-80 ℃.The brittle transition temperature FATT and the ITT of steel be＜-80 ℃, drop hammer tear DWTT (SA=50%) for＜-80 ℃, to tear the ratio Ep/Et that merit accounts for total work be 70-85%.
This steel has been used to make the structural part of arm, supporting leg and the engineering machinery such as vehicle frame and dozer of truck-mounted crane.Also can be used for making automotive frame, high strength framework and oil, letter shoot line.Embodiment 2:
Smelting copper-boron of the present invention at Wuhan Iron and Steel Plant is low-carbon (LC) and ULCB high-strength steel, its actual constituent (by weight percentage) contains C:0.069, Si:0.33, Mn:1.53, P:0.014, S:0.005, Cu:0.16, Nb:0.06, Ti:0.02, B:0.0026, rolls into 12, the 16mm Plate Steel.Its mechanical property: yield strength is that 540MPa, tensile strength are that 680MPa, elongation δ 5 are 21%, ballistic work CVN+20 ℃ also can accomplish that for the wide cold bending test of 188J, 20mm～80mm (d=flexual center diameter, a=sample thickness) d=0,180 ° are intact for 279J ,-20 ℃.The brittle transition temperature FATT and the ITT of steel be＜and-40 ℃.
This steel has been used to make the high-strength structure spare of arm, supporting leg and the engineering machinery such as vehicle frame and dozer of truck-mounted crane.Also can be used for making maritime facilities, storage tanker, boats and ships etc.
Effect of the present invention:
From embodiment 1,2 as seen, above-mentioned steel of the present invention has extremely excellent comprehensive mechanical performance and cold and hot working. This Bright copper boron series high strength low-carbon (LC) and ultra-low-carbon bainite steel hot rolling thin plate and cut deal are for the manufacture of autocrane The high-strength structure spare of arm, supporting leg and the engineering machinery such as vehicle frame and bull-dozer, very popular with users.
Steel of the present invention does not have work hardening because phosphorus content is very low, in production factory uses after the blanking no any be close to curved Therefore metaboly has simplified the operation on cutting and plane limit, directly brings benefit for production factory.
Because steel cold-bending property of the present invention is good, material does not ftracture when die mould, and resilience is little, has reduced repeatedly to press the school Labour intensity, saved man-hour and improved the utilization rate of material.
High strength bainite steel of the present invention is owing to its extremely low carbon content and carbon equivalent, welding heat affected zone maximum hardness Only have HV230, without any tendency of hardenability, can simplify welding procedure and guarantee the good performance of welded H AZ. This steel exists When production factory uses, cancelled preheating and insulation operation that general high strength steel uses in the welding, simplify the welding operation and Obtain extremely excellent welding performance.
Because the above-mentioned good comprehensive performance of steel of the present invention is applied on the engineering machinery at present, its welding performance and low temperature Toughness has sizable surplus capacity. Therefore steel of the present invention can be widely used in pipeline, automobile frame, marine facility, storage The aspect such as oil tank, boats and ships has great application prospect.
In addition, steel of the present invention is easy to operate in production, produces in batches at Wuhan Iron and Steel Plant. The carbon content of steel at first of the present invention Cross over Ultra-low carbon to the scope of low-carbon (LC), so be suitable for producing and smelt operation, improve its applicability in big production And feasibility. Secondly, steel of the present invention is the non-quenching and tempering, high that hot rolling attitude or hot rolling attitude add simple thermal treatment (tempering), Therefore its technology is simple, easy to operate and cheap, is suitable for each Metallurgical Factory and implements.
It is low that steel of the present invention and other high-strength steel are compared cost, because the noble metal element that adds is few, has market competitiveness.
Adopt the steel of the present invention high-strength plate that substitutes imports, import price is amounted to 5400 yuan of RMB approximately by 650 dollars every ton, If by 3000 yuan/tons of average production costs, steel of the present invention can be saved 2400 yuan than every ton of import. Production factory produces this Bright controlled rolling steel is compared with modified plate, and every ton can be saved about 100 yuan of alloy, energy-conservation 50 yuan; By the controlled rolling and controlled cooling plate, than Produce modified plate, 150 yuan of costs can every ton fall in steel mill; Manufactory as make engineering machinery adopt high strength steel and Adopt general carbon steel to compare, can alleviate deadweight 10～50%, and can improve equipment performance and service life, saved simultaneously The energy brings bigger benefit therefore can for manufacturing and use department.
Steel of the present invention has extremely excellent comprehensive mechanical performance, cold and hot working and welding performance. Production technology of the present invention is simple, Cheap, all can implement in each iron and steel metallurgy factory. Steel of the present invention can extensively be used for engineering machinery, pipeline, store oil tank, Automobile, boats and ships and marine facility etc.
Claims (1)
1. a copper boron is low-carbon (LC) and ULCB high-strength steel, it is characterized in that the chemical ingredients (by weight percentage) of steel contains C:0.01～0.08, Si:0.1～0.5, Mn:0.5～2.0, Cu:0.05～0.5, Nb:0.01～0.07, Ti:0.005～0.04, B:0.0002～0.005, Al:0.005～0.08, P, S≤0.025.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97109312A CN1062027C (en) | 1997-11-24 | 1997-11-24 | Low carbon and super low carbon copper and boron bainite steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97109312A CN1062027C (en) | 1997-11-24 | 1997-11-24 | Low carbon and super low carbon copper and boron bainite steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1218115A true CN1218115A (en) | 1999-06-02 |
| CN1062027C CN1062027C (en) | 2001-02-14 |
Family
ID=5171113
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97109312A Expired - Fee Related CN1062027C (en) | 1997-11-24 | 1997-11-24 | Low carbon and super low carbon copper and boron bainite steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1062027C (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100379884C (en) * | 2006-08-29 | 2008-04-09 | 武汉大学 | Method for producing ultra high temperature bainitic steel in ultralow carbon |
| CN101161850A (en) * | 2006-10-11 | 2008-04-16 | 宝山钢铁股份有限公司 | Copper-ageing hardening bainite large-section plastic mould steel and manufacturing technique thereof |
| CN101880835A (en) * | 2010-06-13 | 2010-11-10 | 东北大学 | Seawater corrosion resistant ultra-low carbon bainite steel and preparation method thereof |
| CN101619417B (en) * | 2008-06-30 | 2011-07-13 | 上海梅山钢铁股份有限公司 | Economical weather-resistant checkered plate and production method thereof |
| CN101775543B (en) * | 2009-01-14 | 2011-07-20 | 宝山钢铁股份有限公司 | HB400-grade wear-resisting steel plate and production method thereof |
| CN103243278A (en) * | 2013-05-10 | 2013-08-14 | 武汉钢铁(集团)公司 | X90 pipeline steel and production method thereof |
| CN104988401A (en) * | 2015-07-03 | 2015-10-21 | 李艳 | Tantalum-containing crane cantilever |
| CN109680209A (en) * | 2018-11-07 | 2019-04-26 | 林州凤宝管业有限公司 | A kind of N80 grade of steel Micro Alloying Oil Tube Steel and its method for preparing oil pipe |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100368582C (en) * | 2003-01-28 | 2008-02-13 | 鞍钢股份有限公司 | Ultra-low-carbon bainite steel and producing method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0681032A (en) * | 1992-06-22 | 1994-03-22 | Nippon Steel Corp | Heat treated ht590 steel excellent in uniform elongation and its production |
-
1997
- 1997-11-24 CN CN97109312A patent/CN1062027C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100379884C (en) * | 2006-08-29 | 2008-04-09 | 武汉大学 | Method for producing ultra high temperature bainitic steel in ultralow carbon |
| CN101161850A (en) * | 2006-10-11 | 2008-04-16 | 宝山钢铁股份有限公司 | Copper-ageing hardening bainite large-section plastic mould steel and manufacturing technique thereof |
| CN101619417B (en) * | 2008-06-30 | 2011-07-13 | 上海梅山钢铁股份有限公司 | Economical weather-resistant checkered plate and production method thereof |
| CN101775543B (en) * | 2009-01-14 | 2011-07-20 | 宝山钢铁股份有限公司 | HB400-grade wear-resisting steel plate and production method thereof |
| CN101880835A (en) * | 2010-06-13 | 2010-11-10 | 东北大学 | Seawater corrosion resistant ultra-low carbon bainite steel and preparation method thereof |
| CN101880835B (en) * | 2010-06-13 | 2011-12-07 | 东北大学 | Seawater corrosion resistant ultra-low carbon bainite steel and preparation method thereof |
| CN103243278A (en) * | 2013-05-10 | 2013-08-14 | 武汉钢铁(集团)公司 | X90 pipeline steel and production method thereof |
| CN103243278B (en) * | 2013-05-10 | 2015-05-13 | 武汉钢铁(集团)公司 | X90 pipeline steel and production method thereof |
| CN104988401A (en) * | 2015-07-03 | 2015-10-21 | 李艳 | Tantalum-containing crane cantilever |
| CN104988401B (en) * | 2015-07-03 | 2017-07-07 | 中国石油大学(华东) | A kind of jib boom containing tantalum |
| CN109680209A (en) * | 2018-11-07 | 2019-04-26 | 林州凤宝管业有限公司 | A kind of N80 grade of steel Micro Alloying Oil Tube Steel and its method for preparing oil pipe |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1062027C (en) | 2001-02-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100455692C (en) | High-strength weathering steel and method of manufacturing same | |
| CN101328564B (en) | Low yield ratio HT780 steel plate having superior weldability and manufacturing method thereof | |
| CN106756517B (en) | A kind of steel plate and its manufacturing method for polar region ship | |
| CN1296509C (en) | High strength weldable ageing hardening steel and its production method | |
| CN111187990B (en) | Hot-rolled H-shaped steel with yield strength of 500MPa and production method thereof | |
| CN102699031B (en) | 900 MPa grade ultrahigh-toughness low alloy steel and manufacture method thereof | |
| CN108411196B (en) | Tensile strength is 680MPa grades of large-scale mobile steelss for pressure vessel use and production method | |
| CN1108397C (en) | High-strength, high-toughness and corrosion resistant mooring chain steel and its production process | |
| CA2908447A1 (en) | Steel plate resistant to zinc-induced crack and manufacturing method therefor | |
| CN109881094B (en) | Pressure vessel steel with excellent low-temperature impact property and yield strength of not less than 480MPa and production method thereof | |
| CN112251672B (en) | Low yield ratio EH690 steel sheet with excellent weldability and method for manufacturing same | |
| CN112195397A (en) | Large-thickness low-carbon-equivalent high-toughness wear-resistant steel plate and manufacturing method thereof | |
| CN114134407A (en) | Easy-to-weld steel plate with excellent low-temperature toughness at core for volute and manufacturing method thereof | |
| CN111187981B (en) | Production process of Nb-containing high-strength high-toughness hot-rolled steel sheet pile | |
| CN1062027C (en) | Low carbon and super low carbon copper and boron bainite steel | |
| CN101492791B (en) | Electromagnetic steel plate capable of soldering in large energy input and manufacturing method thereof | |
| CN113737091A (en) | Steel for low-magnetism high-strength corrosion-resistant fastener and fastener | |
| CN107557662A (en) | Quenching and tempering type 800MPa levels low-cost and easy-to welds steel plate and its production method | |
| CN109423572A (en) | High crack arrest, strain resistant initial aging stage characteristic Seawater corrosion-resistant steel plate and its manufacturing method | |
| CN1210431C (en) | Steel series with high linear energy and low weld crack sensitivity and its preparing process | |
| CN113832387B (en) | Low-cost ultra-thick 1000 MPa-grade steel plate and manufacturing method thereof | |
| CN113832413B (en) | Ultra-thick 800 MPa-grade quenched and tempered steel plate with excellent core low-temperature impact toughness and weldability and manufacturing method thereof | |
| CN100350066C (en) | High toughness low carbon bainite thick steel plate and its production method | |
| KR20240005821A (en) | Hot stamping member with tensile strength of 1000 MPa or more and method of manufacturing the same | |
| CN114737109A (en) | Steel for X52 straight welded pipe for thick-wall HIC-resistant oil and gas pipeline and manufacturing method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20010214 Termination date: 20121124 |