CN101403069A - Hot-rolled U shaped metal sheet pile and microalloying production method - Google Patents
Hot-rolled U shaped metal sheet pile and microalloying production method Download PDFInfo
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- CN101403069A CN101403069A CNA2008101976307A CN200810197630A CN101403069A CN 101403069 A CN101403069 A CN 101403069A CN A2008101976307 A CNA2008101976307 A CN A2008101976307A CN 200810197630 A CN200810197630 A CN 200810197630A CN 101403069 A CN101403069 A CN 101403069A
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Abstract
The invention relates to a hot-rolled U-shaped steel sheet pile and a micro-alloying production method thereof, which belong to the field of iron and steel metallurgy and materials. The chemical components of the steel have the following mixture ratio by weight percent: 0.12-0.26 of C, 0.6-1.8 of Mn, 0.25-0.60 of Si, 0.020 or less of P, 0.020 or less of S, 0.010-0.050 of Als, 0.01-0.20 of V and 0.005 or less of N. The method sequentially comprises the steps of converter or electric furnace smelting, secondary refining, continuous casting, heating and rolling. The invention enhances the comprehensive performance of the steel sheet pile, improves the welding performance of the steel sheet pile, improves the utility ratio of the steel sheet pile and has simple production technology.
Description
Technical field
The present invention relates to a kind of hot rolling U-shaped steel sheet pile and microalloying production method thereof, belong to ferrous metallurgy and material field.
Background technology
Steel sheet pile began in Europe to produce in 20 beginnings of the century, and 1903, Japan adopted in the retaining soil construction in this shop of Mitsui by import first, and based on the special use properties of steel sheet pile, nineteen twenty-three, Japan's a large amount of imports in the big earthquake calamity recovery project in the Northeast are adopted.Because steel sheet pile has bigger market potential and development prospect, 1931, in Japan begin to produce.At present, the year consumption of global steel sheet pile has reached 2,500,000-3,000,000 tons, wherein Japanese about 800,000 tons, American-European about 1,400,000 tons.The 1950's, China in the railroad bridge cofferdam construction, introduces use by bridge office of the Ministry of Railways from the former Soviet Union first.Because it is be subjected to the influence of cheap land resources and manpower, domestic production is in space state substantially in addition,, still very slow with development in the application of China as the steel sheet pile of metal building material.Along with China's rapid economy development, all kinds of building worker's methods quick, efficient, environmental protection are approved and are developed that in 20 end of the centurys, the steel sheet pile application project of China has certain development.At present domestic without any manufacturer production, whole dependence on import.
U shaped steel sheet pile (see figure 1) has clod wash type and hot rolling type, because the former has bigger processing, use limitation, thereby hot rolling U-shaped steel sheet pile becomes the main flow of steel sheet pile production development.Hot rolling U-shaped steel sheet pile is widely used in the engineerings such as harbour, levee revetment, retaining wall, dock, cutout, bridge construction cofferdam abroad as a kind of novel environment friendly structural steel.In recent years, European various countries and countries such as Korea S, the U.S. are active development and applying all, and steel sheet pile production is rapidly developed, and consumption increases year by year.The thickness of the edge of a wing x of hot rolling U-shaped steel sheet pile is different, compares with clod wash U shaped steel sheet pile and has so just saved material.And hot rolling U-shaped steel sheet pile snap close thickness also is different, and its snap close interlock is more tightr than clod wash U shaped steel sheet pile, so its sealing and end husky performance and be better than clod wash U shaped steel sheet pile.
Before the present invention, provided the associated viscera of hot rolling U-shaped steel sheet pile among the CNS GB/T 20933-2007, its chemical ingredients (max) requires to see Table 1:
Table 1: hot rolling U-shaped steel sheet pile chemical ingredients (wt/%)
| The trade mark | C | Mn | Si | P | S | V | Nb | Ti | Ceq ≤ |
| Q295bz | 0.16 | 1.50 | 0.55 | 0.040 | 0.040 | 0.15 | 0.060 | 0.20 | 0.40 |
| Q390bz | 0.20 | 1.60 | 0.55 | 0.040 | 0.040 | 0.20 | 0.060 | 0.20 | 0.44 |
| Q420bz | 0.20 | 1.70 | 0.55 | 0.040 | 0.040 | 0.20 | 0.060 | 0.20 | 0.46 |
By above chemical ingredients as can be seen, if want to reach the mechanical property of expection, need to add more expensive alloys, certainly will increase production cost, and increased the production process complicacy, be difficult to control, in addition because hot rolling U-shaped steel sheet pile requires certain weldability, standard GB/T20933-2007 does not stipulate N content, will certainly cause its weldability instability.
Summary of the invention
Technical problem to be solved by this invention is: a kind of micro-alloyed hot-rolled U shaped steel sheet pile and production method thereof are provided, product appropriate design composition of the present invention, interpolation trace alloying element V, and make its mechanical property satisfy user's service requirements fully by the optimization production processing method, can reduce production cost with the easiest, high-efficiency method production and manufacturing again.
Technical scheme of the present invention is achieved in that the chemical ingredients mixture ratio by weight percent of steel of the present invention is as follows: C 0.12～0.26, Mn 0.6～1.8, Si 0.25～0.60, P≤0.020, S≤0.020, Als 0.010～0.050, V 0.01～0.20, N≤0.005, all the other are Fe and unavoidable impurities.
Optimized technical scheme of the present invention is: the chemical ingredients mixture ratio by weight percent of its steel is as follows: C 0.17～0.22, Mn 0.8～1.2, Si 0.25～0.50, P≤0.020, S≤0.020, Als 0.010～0.040, V 0.03～0.10, N≤0.005, all the other are Fe and unavoidable impurities.
The preferred technical scheme of the present invention is: the chemical ingredients mixture ratio by weight percent of its steel is as follows: C 0.19, Mn 1.15, Si 0.27, P 0.010, S 0.011, Als 0.020, V 0.095, N 0.028, all the other are Fe and unavoidable impurities.
Hot rolling U-shaped steel sheet pile microalloying production method of the present invention is: the chemical ingredients mixture ratio by weight percent of its steel is as follows: C 0.12～0.26, Mn 0.6～1.8, Si 0.25～0.60, P≤0.020, S≤0.020, Als 0.010～0.050, V 0.01～0.20, N≤0.005, it comprises converter or electrosmelting, external refining, continuous casting, heating and rolling several steps successively.
When the reasonable production method of the present invention was smelting, it was 1660 ℃～1680 ℃ that control smelts firm temperature; During external refining, control external refining time 〉=30min; Add aluminium, manganese, iron and give deoxidation, add alloy MnFe then successively, VFe or VN alloy are fed the Al line again and are carried out final deoxygenation, feed the Si-Ca line and carry out calcium and handle; The purpose that hello Si-Ca line carries out the calcium processing is for the inclusion in the steel is carried out denaturing treatment; During continuous casting, 1570 ℃～1580 ℃ of teeming temperatures, the continuous casting superheating temperature is controlled at 15～35 ℃, and pulling rate is between 1.0～2.0m/min; During heating, 1100～1150 ℃ of billet heating temperature; When rolling, 1050～1120 ℃ of start rolling temperatures, 850～900 ℃ of finishing temperatures.
The ultimate principle of C, Si, Mn, P, S, Als, V, N limited amount among the present invention below is described in detail in detail.
C:C is the principal element of decision hardness of steel, is to form pearlitic essential substance, and the hardness and the intensity of the form of carbide in steel and how many decision steel, promptly intensity, the hardness along with the increase steel of C content increases, and the plasticity of steel and toughness descend.But when the actual design composition, also considered C content from aspects such as continuous casting process, weldabilities, at first because C content at 0.09%～0.17% o'clock, the phase transformation of steel is in the Peritectic Reaction district, strand easily cracks, even causes the crackle bleed-out; Require to have certain weldability aspect from steel sheet pile, C content should not be too high, will have the advantages of higher tensile strength aspect from the customer requirements steel sheet pile, and C content should not be low excessively.Therefore, C content target value is controlled in 0.12%～0.26% scope optimization aim 0.17%～0.22%.
Mn:Mn has the effect of solution strengthening and crystal grain thinning reinforcement, in the design of non-hardened and tempered steel, usually adopt and reduce C content, increase Mn content, to reach the too fast purpose of the unlikely reduction of toughness when improving intensity, but when its content is too much, can reduce phase critical point greatly, improper process control bainite can occur in the tissue, intensity raises, and toughness descends.In addition, consider (carbon equivalent) from the welding aspect of hot rolling U-shaped steel sheet pile, Mn content also is difficult for too high.Therefore, actual Mn content target value is controlled in 0.6%～1.80% scope optimization aim 0.8%～1.2%.
V:V is the precipitation strength element, combines with C, N in hot-rolled steel sheet pile process of cooling, forms V (CN)
xThrow out, improve the hardness and the intensity of steel sheet pile, part of V (C, N) particle becomes the ferrite core, promote the ferritic generation of intracrystalline, make the crystal grain of steel obtain refinement, in the heat-processed of steel sheet pile welding, organize grain growth, refine austenite crystal grain, thereby intensity, ductility and the toughness of raising steel sheet pile.In addition, when steel sheet pile by austenite in the perlitic transformation process, V (CN)
xEarlier precipitation is separated out, and reduces austenitic carbon concentration, promotes the extremely low ferritic formation of carbon content, but when the effect less than 0.01% time of V content not obvious, when V content no longer includes further effect above 0.20% the time.Therefore, actual V content target value is controlled in 0.01%～0.20% scope optimization aim 0.03%～0.10%.
S and P:S, P are intensive crack sensitivity elements, thereby should be low as much as possible, the S too high levels, can form a large amount of MnS, MnS easily separates out at crystal boundary when solidification of molten steel, is rolled into band shape and be mingled with when hot rolling, reduced the mechanical property of steel, so S content is low more good more.P can improve the low temperature brittleness transition temperature, and the low temperature impact properties of steel is declined to a great extent, so general requirement P≤0.020%.
N:N is an obnoxious flavour element in the steel, and it mainly influences the weldability of slab surface quality, finished product and ageing etc., therefore, and N in the working control≤0.005%.
Micro-alloyed hot-rolled U shaped steel sheet pile of the present invention and production method thereof have following advantage:
1) the present invention has improved the over-all properties of steel sheet pile by only adding a kind of V microalloying, and production technique is simple, is beneficial to popularization.
2) content of N element has been controlled in strictness of the present invention, has improved the welding property of steel sheet pile, has improved the utilization ratio of steel sheet pile.
3) the present invention has filled up domestic blank of not producing steel sheet pile, and its superior performance can substitute present imported product fully.
Description of drawings
Fig. 1 is the hot rolling U-shaped steel sheet pile sectional drawing
Embodiment
The present invention will be further described below in conjunction with embodiment:
Embodiment 1
The chemical ingredients mixture ratio by weight percent of steel is as follows: C 0.17, Mn 0.91, Si0.40, P 0.018, S 0.012, Als 0.020, V 0.073, N 0.0029, all the other are Fe and unavoidable impurities.
Production method comprises 120t converter smelting, external refining, continuous casting, heating, universal rolling successively, and the parameter of each step is:
During smelting, it is 1660 ℃～1680 ℃ that control smelts firm temperature; During external refining, control external refining time 〉=30min; Add aluminium, manganese, iron and give deoxidation, add alloy MnFe then successively, VFe or VN alloy are fed the Al line again and are carried out final deoxygenation, feed the Si-Ca line and carry out calcium and handle; The purpose that hello Si-Ca line carries out the calcium processing is for the inclusion in the steel is carried out denaturing treatment; During continuous casting, 1570 ℃～1580 ℃ of teeming temperatures, the continuous casting superheating temperature is controlled at 15～35 ℃, and pulling rate is between 1.0～2.0m/min; During heating, 1100～1150 ℃ of billet heating temperature; When rolling, 1050～1120 ℃ of start rolling temperatures, 850～900 ℃ of finishing temperatures.
The actual chemical ingredients of the product of producing (the production method embodiment 1～3 of the micro-alloyed hot-rolled U shaped steel of the present invention sheet pile) sees Table 2, and the surplus of listed chemical ingredients is Fe and unavoidable impurities in the table, and the performance test result of steel of the present invention lists table 3 in.
Embodiment 2
The chemical ingredients mixture ratio by weight percent of steel is as follows: C 0.19, Mn 1.15, Si0.27, P 0.010, S 0.011, Als 0.030, V 0.095, N 0.0028, all the other are Fe and unavoidable impurities.
The preparation method is with embodiment 1.
Embodiment 3
The chemical ingredients mixture ratio by weight percent of steel is as follows: C 0.21, Mn 1.04, Si0.32, P 0.008, S 0.017, Als 0.030, V 0.030, N 0.0025, all the other are Fe and unavoidable impurities.
Table 2: the mechanical properties test of product
| Embodiment | Yield strength ReL (Mpa) | Tensile strength R m(Mpa) | Unit elongation A (%) | Relative reduction in area Z (%) |
| 1 | 415 | 600 | 25.5 | 65.0 |
| 2 | 425 | 610 | 26.5 | 62.0 |
| 3 | 390 | 580 | 32.0 | 63.0 |
Claims (9)
1, a kind of hot rolling U-shaped steel sheet pile, the chemical ingredients mixture ratio by weight percent of its steel is as follows: C 0.12～0.26, Mn 0.6～1.8, Si 0.25～0.60, P≤0.020, S≤0.020, Als 0.010～0.050, V 0.01～0.20, N≤0.005, all the other are Fe and unavoidable impurities.
2, a kind of hot rolling U-shaped steel sheet pile according to claim 1, the chemical ingredients mixture ratio by weight percent of its steel is as follows: C 0.17～0.22, Mn 0.8～1.2, Si 0.25～0.50, P≤0.020, S≤0.020, Als 0.010～0.040, V 0.03～0.10, N≤0.005, all the other are Fe and unavoidable impurities.
3, a kind of hot rolling U-shaped steel sheet pile according to claim 1 and 2, the chemical ingredients mixture ratio by weight percent of its steel is as follows: C 0.19, Mn 1.15, Si 0.27, P 0.010, S 0.011, Als 0.020, V 0.095, N 0.0028, all the other are Fe and unavoidable impurities.
4, a kind of hot rolling U-shaped steel sheet pile microalloying production method, the chemical ingredients mixture ratio by weight percent of its steel is as follows: C 0.12～0.26, Mn 0.6～1.8, Si 0.25～0.60, P≤0.020, S≤0.020, Als 0.010～0.050, V 0.01～0.20, N≤0.005, it comprises converter or electrosmelting, external refining, continuous casting, heating and rolling successively.
5, hot rolling U-shaped steel sheet pile microalloying production method according to claim 4, when wherein smelting, it is 1660 ℃～1680 ℃ that control smelts firm temperature.
6, hot rolling U-shaped steel sheet pile microalloying production method according to claim 4, wherein during external refining, control external refining time 〉=30min; Add aluminium, manganese, iron and give deoxidation, add alloy MnFe then successively, VFe or VN alloy are fed the Al line again and are carried out final deoxygenation, feed the Si-Ca line and carry out calcium and handle.
7, hot rolling U-shaped steel sheet pile microalloying production method according to claim 4, wherein during continuous casting, 1570 ℃～1580 ℃ of teeming temperatures, the continuous casting superheating temperature is controlled at 15～35 ℃, and pulling rate is between 1.0～2.0m/min.
8, hot rolling U-shaped steel sheet pile microalloying production method according to claim 4, when wherein heating, 1100～1150 ℃ of billet heating temperature.
9, hot rolling U-shaped steel sheet pile microalloying production method according to claim 4, when wherein rolling, 1050～1120 ℃ of start rolling temperatures, 850～900 ℃ of finishing temperatures.
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| CN101838769A (en) * | 2010-04-09 | 2010-09-22 | 武汉钢铁(集团)公司 | Steel for hot rolling U type steel sheet pile with tensile strength more than or equal to 600MPa and production method thereof |
| CN101845587A (en) * | 2010-04-09 | 2010-09-29 | 武汉钢铁(集团)公司 | Steel with yield ratio no larger than 0.8 for hot rolling U-shaped steel sheet pile and production method thereof |
| CN101845584A (en) * | 2010-04-09 | 2010-09-29 | 武汉钢铁(集团)公司 | Fresh-water corrosion resistant steel for U-shaped steel sheet pile and method for producing same |
| CN101629268B (en) * | 2009-07-30 | 2011-02-02 | 江苏沙钢集团淮钢特钢有限公司 | Microalloying high-strength and anti-crack flat steel for automobile girder and production process thereof |
| CN103074545A (en) * | 2013-02-05 | 2013-05-01 | 莱芜钢铁集团有限公司 | High-strength low temperature hot rolling resistant channel steel for forklift gantry and preparation method for channel steel |
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| CN107365944A (en) * | 2017-07-29 | 2017-11-21 | 华北理工大学 | Hot rolling U-shaped steel sheet pile and its manufacturing process |
| CN109576590A (en) * | 2019-01-23 | 2019-04-05 | 河北津西钢板桩型钢科技有限公司 | A kind of bending resistance U-shaped steel sheet pile and its manufacturing method |
| CN112727900A (en) * | 2020-12-25 | 2021-04-30 | 山东德坊新材料科技有限公司 | Hot-rolled C9 type lock catch deformed steel |
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- 2008-11-13 CN CN2008101976307A patent/CN101403069B/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101629268B (en) * | 2009-07-30 | 2011-02-02 | 江苏沙钢集团淮钢特钢有限公司 | Microalloying high-strength and anti-crack flat steel for automobile girder and production process thereof |
| CN101838769A (en) * | 2010-04-09 | 2010-09-22 | 武汉钢铁(集团)公司 | Steel for hot rolling U type steel sheet pile with tensile strength more than or equal to 600MPa and production method thereof |
| CN101845587A (en) * | 2010-04-09 | 2010-09-29 | 武汉钢铁(集团)公司 | Steel with yield ratio no larger than 0.8 for hot rolling U-shaped steel sheet pile and production method thereof |
| CN101845584A (en) * | 2010-04-09 | 2010-09-29 | 武汉钢铁(集团)公司 | Fresh-water corrosion resistant steel for U-shaped steel sheet pile and method for producing same |
| CN101845587B (en) * | 2010-04-09 | 2011-11-23 | 武汉钢铁(集团)公司 | Steel with yield ratio no larger than 0.8 for hot rolling U-shaped steel sheet pile and production method thereof |
| CN101845584B (en) * | 2010-04-09 | 2012-07-25 | 武汉钢铁(集团)公司 | Fresh-water corrosion resistant steel for U-shaped steel sheet pile and method for producing same |
| CN101838769B (en) * | 2010-04-09 | 2012-08-22 | 武汉钢铁(集团)公司 | Steel for hot rolling U type steel sheet pile with tensile strength more than or equal to 600MPa and production method thereof |
| CN103074545A (en) * | 2013-02-05 | 2013-05-01 | 莱芜钢铁集团有限公司 | High-strength low temperature hot rolling resistant channel steel for forklift gantry and preparation method for channel steel |
| CN103866183A (en) * | 2014-03-20 | 2014-06-18 | 莱芜钢铁集团有限公司 | Channel steel used in high-strength forklift gantry and preparation method thereof |
| CN103866182A (en) * | 2014-03-20 | 2014-06-18 | 莱芜钢铁集团有限公司 | Low-cost manufacturing method of 700 MPa-grade cold-rolled high-strength steel and thin steel strip based on cover annealing treatment |
| CN103866182B (en) * | 2014-03-20 | 2016-04-27 | 莱芜钢铁集团有限公司 | Based on the 700MPa level cold rolling high strength steel of bell-type annealing process and the low-cost manufacture method of thin steel band |
| CN104846297A (en) * | 2015-04-13 | 2015-08-19 | 罗光政 | Vanadium titanium niobium chromium manganese nitrogen molybdenum microalloyed pre-buried groove, and production method thereof |
| CN105274425A (en) * | 2015-10-28 | 2016-01-27 | 中钢集团邢台机械轧辊有限公司 | High-alloy roller for front stage of hot continuous finish rolling and preparation method thereof |
| CN107365944A (en) * | 2017-07-29 | 2017-11-21 | 华北理工大学 | Hot rolling U-shaped steel sheet pile and its manufacturing process |
| CN109576590A (en) * | 2019-01-23 | 2019-04-05 | 河北津西钢板桩型钢科技有限公司 | A kind of bending resistance U-shaped steel sheet pile and its manufacturing method |
| CN112727900A (en) * | 2020-12-25 | 2021-04-30 | 山东德坊新材料科技有限公司 | Hot-rolled C9 type lock catch deformed steel |
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