CN101550520A - 600MPa level hot rolling thin steel plate and manufacturing method thereof - Google Patents
600MPa level hot rolling thin steel plate and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses a 600MPa level hot rolling thin steel plate and a manufacturing method thereof. The steel plate comprises the following chemical compositions by weight percentage: 0.02-0.09 of C, 0.01-0.35 of Si, 0.20-0.90 of Mn, lower than 0.04 of P, lower than 0.005 of S, lower than 0.20 of Ni, 0.2-0.4 of Cu, 0.30-0.45 of Cr, 0.005-0.050 of Als, 0.0005-0.005 of Ca and 0.02-0.15 of Ti, one or more than one types of 0-0.070 of Nb and 0-0.003 of Bs, the balance of Fe and inevitable impurities. The steel is continuously cast into plate blanks of 120-300mm; then the obtained plate blanks are heated uniformly at the temperature of 1260 DEG C-1200 DEG C, is roughly rolled in the range of higher than 1040 DEG C, starts to finishing rolling at the temperature of 1100 DEG C-1000 DEG C, ends rolling at the temperature of 950 DEG C-880 DEG C, is cooled at the cooling speed of 20 DEG C/s in 10s after rolling and is reeled up at the temperature of 550 DEG C-650 DEG C. The weight of a container manufactured by the steel plate is reduced by 15-40 percent, therefore, the production cost is reduced.
Description
Technical field
The invention belongs to the low alloy steel technical field, be specifically related to a kind of low cost, high-intensity 600MPa level hot rolled steel sheet and manufacture method thereof.
Background technology
Make industry at freight container, what generally adopt the 345MPa level at present is the hot rolled steel sheet with atmospheric corrosion resistance (Gao Naihou steel plate) the manufacturing outside plate and the inner frame of main alloying constituent with Cu, P, Cr, Ni, because the intensity of this steel is low, want to reach design requirements and will adopt thicker size, the own wt of freight container is increased, and cost increases.The steel plate that now is used for the freight container manufacturing reaches more than 3,000,000 tons, and follows the development of encased conveying industry, and the quantity of the needed steel of this industry also increases year by year.Along with the growing interest of people to problems such as Mineral resources, the energy, manufacturing costs, freight container lightweight, long lifetime become a kind of trend, in this case, have begun to occur using the symptom of a trend of the little aluminum making freight container of density.But owing to the restriction that is subjected to reasons such as price height, intensity are low, aluminium can't become the main flow material that freight container is made, and wants really to realize the lightweight of freight container, also needs to start with from steel.
If freight container reaches more than the 600MPa with the yield strength of steel plate, just can reduce the thickness 15%～40% of container structure material, under the prerequisite of the integral rigidity that ensures structure, can effectively reduce the deadweight of unit casing, the unit steel using amount that reduces freight container, the delivery efficient that improves freight container, saving freight container manufacturing cost are had important practical sense.
Owing to need a large amount of cold roll forming processes when making container structure spare, it is high therefore must to be for the requirement of steel that intensity is wanted, and cold roll forming will get well, and can stablize moulding and does not ftracture.Just need steel to have high strength, high cold deformation ductility, consider from economic aspect in addition, this container steel plate should have and is easy to produce characteristics with low cost.Existing yield strength does not also reach requirement in this respect to the steel plate more than the 600MPa.
In Japanese kokai publication sho 63-72853 communique, once disclosed and in high P steel, added Nb, Ti, V, B to realize the lightweight and the long lifetime of freight container with structured material.But this composition system can ensure intensity, weathering resistance, can't ensure the stability of brake forming.
In Japanese kokai publication hei 3-2321 communique once openly ultimate tensile strength in the manufacture method of the good weathering resistance hot-rolled steel sheet of 590MPa or above cold-workability.But this steel plate yield strength still is on the low side, can not satisfy the further light-weighted requirement of freight container.
In the patent of publication number CN 1639371A, a kind of atmospheric corrosion resistance steel plate of 700MPa level is proposed, intensity in the example and unit elongation are very high, but the alloy in its mentality of designing is very high, does not have advantage on the cost.In rolling, the temperature range of finish rolling is narrow, and is high to the rolling control requirement of milling train, the production bad adaptability.
Pearl steel patent CN1785543A proposes to produce the high-strength container steel plate with CSP.It is applicable to thin slab, does not have the clear and definite heavy slab that whether is applicable to, has application limit, and alloying constituent such as noble metal Ni is higher, and cost of alloy does not also reach desired level.
As mentioned above, desired yield strength is more than 600MPa, and unit elongation height, cold roll forming are good, and has the steel plate special that the freight container with low cost, that be suitable for of atmospheric corrosion resistance is made, and the past does not also have production technology preferably.
Summary of the invention
The purpose of this invention is to provide a kind of with low cost, yield strength in 600MPa or above hot rolling weather-resisting steel plate and manufacture method thereof with high strength, high-elongation, good cold roll forming.Because the raising of intensity can realize the steel plate reduced thickness, when making freight container, can save the steel consumption amount, and alleviate the casing deadweight significantly, improve container efficiency.
The present invention proposes a kind of 600MPa level hot rolled steel sheet, and the weight percent of its chemical ingredients is:
C:0.02%～0.09%, Si:0.01%～0.35%, Mn:0.20%～0.90%, P:0.04% are following, S:0.005% is following, Ni:0.20% is following, Cu:0.2%～0.4%, Cr:0.30%～0.45%, Als:0.005%～0.050%, Ca:0.0005%～0.005%, Ti:0.02%～0.15% and contain in Nb:0%～0.070%, Bs:0%～0.003% one or more, and surplus is Fe and unavoidable impurities.
The production technique of this steel plate is characterized as:
After described steel become the slab of 120～300mm thickness through continuous casting, after 1260～1200 ℃ of homogeneous heating, in being higher than 1040 ℃ temperature range, carry out roughing, 1100～1000 ℃ of beginning finish rolling, rolling 950～880 ℃ of end, rolling back 10s with interior cool off with 20 ℃/ speed of cooling s more than after, batch at 550～650 ℃.
The detailed description of technical characterictic:
(1) the present invention seeks to realizing the lightweight and cheap for manufacturing costization of freight container, providing a kind of is raw material with the plate of moderate thickness base, guarantee that yield strength is good at 600MPa or above high strength, unit elongation height, cold roll forming, be easy to that produce, with low cost simultaneously, product thickness is in hot rolling weather-resisting steel plate and the manufacture method thereof of 1.0～6.0mm.
(2) one of important feature of the present invention is the selection of Ti element.
Ti is important microalloy strengthening element in the present invention, and except that effective crystal grain thinning, the small TiC precipitated phase that is lower than 10nm of its formation has very high precipitation strength effect, can increase substantially armor plate strength.Be lower than 0.07%, precipitation strength effect deficiency, the influence that is higher than 0.15% pair of continuous casting increases, and can cause strand lobe incidence to rise, and therefore limiting its scope is 0.07%～0.15%.But when adding B, because B has improved the build up effect, the lower limit of Ti can be loosened to 0.020%.
(3) Ni is a precious metal element, and its scope that plays obvious corrosion-resistant effect is more than 1.0%.The present invention not with the Ni element as corrosion-resistant element, suitably add this element and mainly be surface C u seminess when taking precautions against the slab heating.For controlling cost, limit it and be lower than 0.12%.
(4) Cu is the element that ensures corrosion resistance nature, and it reaches at 0.20% o'clock, and effect raises too much and surpass 0.40% cost, so limit its scope 0.20%～0.40% near saturated.
(5) Cr is used as atmospheric corrosion resistance element and Cu, and necessary amount is 0.30%, and surpassing 0.45% cost increases too much, and therefore limiting its content range is 0.30%～0.45%.
(6) the C element is a strengthening element, and it is lower than at 0.02% o'clock, solution strengthening effect deficiency.Surpass 0.09%, carbon equivalent improves, and weldability is unfavorable, and the carbide of the Ti that separates out simultaneously is easy to alligatoring, has reduced the precipitation strength effect of TiC, and therefore limiting its scope is 0.02%～0.09%.
(7) Mn is a strengthening element, is again the element that certainly exists when smelting in the steel.Determine its content range according to the intensity rank level that will reach, but make it be lower than 0.20% pair of smelting requirements height, increase cost.Limiting it and be no more than 0.90%, mainly is to consider cost factor, and too highly also is unfavorable for welding, and unit elongation etc. also are affected, and determine that therefore its scope is 0.20%～0.90%.
(8) Si is the element with desoxydatoin, is lower than 0.01%, can increase the steel making working procedure cost.Be higher than 0.35%, easily make slab produce the regeneration iron sheet that is difficult to remove, influence the surface quality of finished product steel plate.Therefore determine that its scope is 0.01%～0.35%.
(9) Ca is except nodularization Sization thing, makes the tiny and uniform distribution of inclusion, reduces outside non-uniform corrosion takes place, and the CaS of generation also has the effect that improves steel plate and rusty scale interface pH value, and the 0.0005%th, the amount of its necessity.Because S content is the highest is no more than 0.005%, make Ca residual content in steel surpass at 0.005% o'clock, add difficultly, also there is no need.
(10) P is easy to cause segregation, and is unfavorable to weldability and cold roll forming performance.For guaranteeing that weldability requires and the cold roll forming performance, the present invention controls it and is lower than 0.04%.
(11) S is a harmful element, on mechanical property, is low more good more naturally, but crossing the low process cost that can cause increases, and it is big to make steel plate produce the vertical performance difference of Heng above 0.005%, and steel plate horizontal expansion rate is reduced, and is limited to 0.005% on it so limit.
(12) Nb is the element of crystal grain thinning, adds it and can obviously improve the temperature in austenite non-recrystallization district, thereby reduce the crystal particle scale of finished product, increases the dislocation desity of tissue.Because Nb need fully be solidly soluted in the austenite and just can play effect, and it is in selected Heating temperature with under heat-up time when content reaches 0.07%, and solid solubility reaches capacity substantially, increases also not effect of content again, cause waste on the contrary, so the upper limit is defined as 0.07%.In the present invention, because Ti has very strong precipitation strength effect.Enough fast when cooling rate, and coiling temperature is when suitable, because the precipitation strength of Ti precipitation particles, even do not add Nb, the yield strength of steel plate also can reach more than the 600MPa.So only limit its upper limit, will not limit to its lower limit.Its scope is 0%～0.07%.
(13) B postpones ferritic transformation, improves the element that bainite structure is strengthened amplitude.When only being stored in the steel with the Bs form, B just can play effect.So only Bs content is stipulated among the present invention.Bs content reaches at 0.0005% o'clock, will bring into play useful effect, and its content surpasses 0.003%, acts on saturated.So the scope when selecting to add B is defined as Bs:0.0005～0.003%.And when the content that adds Ti+Nb is not less than 0.09%, need not add B, the yield strength of steel plate also can reach more than the 600MPa.
With the composition that the present invention limits, become the slab of 120～300mm by the plate of moderate thickness billet casting machine continuous casting after, adopt direct hot charging, cold charge to enter the process furnace soaking, produce by hot continuous rolling production line.To the reasons are as follows that each phase temperature limits:
(14) Heating temperature is limited to 1200～1260 ℃, is because add higher Ti in the steel, make Ti give full play to the precipitation strength effect and does not influence unit elongation, need its abundant solid solution in austenite, 1200 ℃ is necessary temperature, and above 1260 ℃, energy consumption raises, and the oxidational losses of steel billet is big.So determine that Heating temperature is 1200～1260 ℃.
(15) roughing is to prepare for finish rolling, start rolling temperature is limited to more than 1040 ℃, and the plasticity of steel is good, and intensity is low, be easy to rollingly, can not cause the bad and shape defect problems such as nose, wooden dipper song that take place of size to influence normally carrying out of step operation down because of the head and tail temperature difference of intermediate blank.Be lower than 1040 ℃, the probability of roughing steel billet generation shape defect is increased.
(16) final rolling temperature is higher than 1100 ℃, and finished product crystal grain is difficult for refinement, and the refined crystalline strengthening effect is bad.Be lower than 1000 ℃, then increase the load of finishing stand, cause accident easily.Advance finishing stand at 1100～1000 ℃ and begin rollingly, can make mill load not too high, again effective crystal grain thinning.
(17) owing to contain Ti, and the carbide of expectation Ti separates out in the operation of rolling as far as possible less, influences final precipitation strength effect.Determine that rolling finishing temperature is at 950～880 ℃.Finishing temperature is higher than 950 ℃, and the grain refining deficiency influences strengthening effect.Be lower than 880 ℃, can induce the carbide of separating out Ti because of the energy storage of rolling deformation.These carbide of separating out earlier are thicker, and are little to the contribution of yield strength, but cause the decline of unit elongation.Simultaneously, finishing temperature is low excessively, and the load of milling train can increase, and causes casualty ratio of accidents to rise.And the transverse and longitudinal performance difference of steel plate also raises.
(18) coiling temperature is determined at 550～650 ℃, because be higher than 650 ℃, the ferrite after the phase transformation still has grows up tendency and influence grain refining effect, and the TiC precipitated phase of separating out can thickization, and reduction precipitation strength effect.Be lower than 550 ℃, separating out of the carbide of Ti can be suppressed.The strengthening effect of TiC precipitated phase can not given full play to.
(19) determining to roll the back at the 10s internal cooling, is in order to ensure enough dislocation desities are arranged in the deformed austenite after rolling.These highdensity dislocations are to improve the fundamental factor of phase transformation nucleation rate.Surpass 10s, dislocation desity reduces, and the thick TiC that separates out earlier can increase, and the effect of finished product grain refining, precipitation strength all can be a greater impact.Speed of cooling requires to be higher than 20 ℃/s, is because high speed of cooling can realize bigger phase transformation condensate depression, is suppressed at the carbide that phase boundary is separated out thick Ti, and guarantees crystal grain thinning.Cooling rate is lower than 20 ℃/s, and the particle that crystal boundary is separated out increases, and is unfavorable to the mechanical property and the cold roll forming performance of finished product.
Advantage and effect of the present invention are that cost of alloy is low, and production technique is simple.Because yield strength reaches and still has good cold forming capability more than the 600MPa, can substitute the freight container steel plate of present 345MPa level, makes structural part weight saving 15%～40%.Use steel plate of the present invention and can reduce the steel consumption amount of making freight container significantly, thereby reduce the production cost of freight container, the tare mass of freight container made from this steel plate is little, can improve efficiency of loading, reduce transportation cost.Because steel plate also has atmospheric corrosion resistance, and wear-resistant, anti-zoned, anti-pressure ability is stronger, can make freight container have longer work-ing life.
Embodiment
Introduce the specific embodiment of the present invention below
The weight percent of steel chemical composition of the present invention is:
C:0.02%～0.09%, Si:0.01%～0.35%, Mn:0.20%～0.90%, P:0.04% are following, S:0.005% is following, Ni:0.20% is following, Cu:0.2%～0.4%, Cr:0.30%～0.45%, Als:0.005%～0.050%, Ca:0.0005%～0.005%, Ti:0.02%～0.15% and contain in Nb:0%～0.070%, Bs:0%～0.003% one or more, and surplus is Fe and unavoidable impurities.
Use the steel of above-mentioned chemical ingredients, become the slab of 120～300mm thickness through continuous casting after, being characterized as of its production technique, after 1260～1200 ℃ of homogeneous heating, be higher than in 1040 ℃ the temperature range and carrying out roughing, 1100～1000 ℃ of beginning finish rolling, rolling 950～880 ℃ of end, rolling in the 10s of back cool off with 20 ℃/ speed of cooling s more than after, batch at 550～650 ℃.
Table 1～3rd, the several embodiment that produce according to above-mentioned Chemical Composition scope and with 345,450, composition, the performance comparison of 550MPa level weathering steel.
The composition of table 1 embodiment
(2) hot rolling technology control embodiment
The thickness range of finished product of the present invention is at 1.0mm～6.0mm, be by smooth, open the flat board that flat operation is produced.
Steel plate is in hot continuous rolling production line production, and concrete technology controlling and process example is as follows.
(3) the mechanical property level of embodiment
Claims (2)
1, a kind of 600MPa level hot rolled steel sheet, it is characterized in that, the weight percent of its chemical ingredients is, C:0.02%～0.09%, Si:0.01%～0.35%, Mn:0.20%～0.90%, below the P:0.04%, below the S:0.005%, below the Ni:0.20%, Cu:0.2%～0.4%, Cr:0.30%～0.45%, Als:0.005%～0.050%, Ca:0.0005%～0.005%, Ti:0.02%～0.15%, and contain Nb:0%～0.070%, in Bs:0%～0.003% one or more, surplus are Fe and unavoidable impurities.
2, press the manufacture method of the described a kind of 600MPa level hot rolled steel sheet of claim 1, it is characterized by: the slab that the steel of described composition is become 120～300mm thickness at continuous casting, after 1260～1200 ℃ of homogeneous heating, be higher than in 1040 ℃ the temperature range and carry out roughing, 1100～1000 ℃ of beginning finish rolling, rolling 950～880 ℃ of end, in rolling back 10s,, batch at 550～650 ℃ with the above speed of cooling cooling of 20 ℃/s.
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| CN101956141A (en) * | 2010-10-08 | 2011-01-26 | 莱芜钢铁股份有限公司 | Low-cost non-quenched and tempered high-strength wear-resistant steal plate with yield strength of 780 MPa grade and manufacturing method thereof |
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| CN102994875A (en) * | 2012-11-16 | 2013-03-27 | 济钢集团有限公司 | Weathering steel and manufacturing method thereof |
| CN107779740A (en) * | 2016-08-26 | 2018-03-09 | 鞍钢股份有限公司 | Yield strength 700MPa grade atmospheric corrosion resistants hot rolled strip and manufacture method |
| CN107779740B (en) * | 2016-08-26 | 2019-02-26 | 鞍钢股份有限公司 | Yield strength 700MPa grade atmospheric corrosion resistant hot rolled strip and manufacturing method |
| CN107475615A (en) * | 2017-09-23 | 2017-12-15 | 武钢集团昆明钢铁股份有限公司 | A kind of weather-proof low-yield point damper steel plate of 160MPa levels and strip production methods |
| CN108342662B (en) * | 2018-02-23 | 2020-03-10 | 柳州钢铁股份有限公司 | High-strength weathering steel with yield strength of 550MPa |
| CN108251737A (en) * | 2018-02-23 | 2018-07-06 | 柳州钢铁股份有限公司 | A kind of manufacturing method of yield strength 550MPa grade high-strength weathering steels |
| CN108342662A (en) * | 2018-02-23 | 2018-07-31 | 柳州钢铁股份有限公司 | A kind of yield strength 550MPa grade high-strength weathering steels |
| CN109266960A (en) * | 2018-09-26 | 2019-01-25 | 武汉钢铁有限公司 | Using the tensile strength >=800MPa thin gauge weathering steel and method of short route production |
| CN113584406A (en) * | 2021-07-14 | 2021-11-02 | 武汉钢铁有限公司 | Steel for fireproof door plate produced by CSP process and manufacturing method thereof |
| CN114161725A (en) * | 2021-12-13 | 2022-03-11 | 湖南平安医械科技有限公司 | Automatic assembling device for intravenous needle on disposable infusion apparatus |
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Application publication date: 20091007 |