CN101864538B - Nickel-free weather-resistant steel and method for preparing hot rolled plate thereof - Google Patents
Nickel-free weather-resistant steel and method for preparing hot rolled plate thereof Download PDFInfo
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Abstract
The invention provides nickel-free weather-resistant steel and a method for preparing a hot rolled plate thereof, and mainly solves the technical problems of high cold crack index, not very good welding performance and the like due to high C, Si and Mn content of the conventional nickel-free weather-resistant steel. The technical scheme is that: the weather-resistant steel comprises the followingalloying ingredients in percentage by weight: 0.05 to 0.10 percent of C, 0.35 to 0.50 percent of Si, 0.38 and 0.50 percent of Mn, 0.07 to 0.11 percent of P, less than 0.010 percent of S, 0.45 to 0.60percent of Cr, 0.25 to 0.45 percent of Cu, 0 to 50ppm of B, and the balance of Fe. The nickel-free weather-resistant steel of the invention is mainly used for replacing high-grade 09CuPCrNi weather-resistant steel.
Description
Technical field:
The invention belongs to the weathering steel technical field, be specifically related to a kind of nickel-free weather-resistant steel and latten manufacturing technology thereof with excellent mechanical performances, impact property, welding property and over-all properties such as corrosion-resistant.
Background technology:
At present, existing a plurality of both at home and abroad patent of invention reports about weathering steel.The composition mentality of designing mainly adopts two lines except that adding the Cu can improve corrosion resistance nature, P element.Precious metal alloys elements such as a kind of interpolation Cr, Ni, V, Ti; Wherein, the Cr element can improve mechanics and corrosion resistance nature, and the Ni element is except that improving corrosion resistance nature; Can also effectively suppress the copper Yin Gaowen selective oxidation (iron in the selective oxidation steel; And copper is not oxidized), stop in the slab rolling process under the iron scale liquid phase copper of enrichment along crystal boundary to the matrix internal penetration, cause steel slab surface and limit portion defective and cracking to occur.For example, the home market the highest container plate of occupation rate is used steel 09CuPCrNi, and composition is a cupric about 0.30%, nickeliferous about 0.25%.But along with precious metal price volalilitys such as international nickel, such steel production cost is higher.
Another kind of design route is to prepare economy type weathering-resistant steel through increasing low-cost alloying element replacement precious metal element.Chinese patent 85108118 has proposed a kind of Weather-resistant low alloy steel, adds the mechanical property that 0.04-0.08%V and 0.05-0.10%Re replace Ni, Cr element raising material.But the removal meeting of Cr element obviously reduces the corrosion resistance nature of material, compares with the present invention, can not be applied to ocean etc. and use the manufacturing of product down than strong corrosive environment, and add V, the Re element makes its price still higher.Another Chinese patent 200510045624.6 more approaching with patent of the present invention provides a kind of economy type weathering-resistant steel; After alloying constituent is removed Cr, Ni; To the best low-cost alloying element cu of weather resistance, P content also respective limits 0.1～0.4%Cu and＜0.034%P; Be lower than Cu of the present invention, P constituent content, through increasing more C, Si, Mn element to improve the corrosion resistance nature of material, composition range 0.12-0.21%C; 0.2-2.0%Si; 0.7-2.0%Mn.But; The too much interpolation of alloying element still can cause the increase of cost on the one hand; Add more Si element on the other hand in the slab and can cause the steel plate iron scale to be difficult to remove, the C of material, Si, Mn content are higher, can cause the cold crack index higher; Welding property is not fine, and reduces or remove Cu, P, Cr element the corrosion resistance nature of slab is also had bad influence.In addition, such patent does not all relate to the hot-short method that causes surperficial check crack that overcomes copper in the domestic and international actual production in the ubiquitous no nickel Copper Bearing Steel course of hot rolling, and particularly when producing latten, because the slab deformation size is bigger, this phenomenon is the most outstanding.
Summary of the invention:
The purpose of this invention is to provide a kind of low-cost nickel-free weather-resistant steel and latten preparation method thereof.It is higher mainly to solve C, Si, Mn content that existing nickel-free weather-resistant steel exists, can cause the cold crack index higher, and welding property is not a technical problem such as fine.
The technical solution adopted for the present invention to solve the technical problems is:
1) composition design: the alloying constituent of this weathering steel and weight percentage content are: C:0.05-0.10%, Si:0.35-0.50%, Mn:0.38-0.50%, P:0.07-0.11%, S:＜0.010%, Cr:0.45-0.60%, Cu:0.25-0.45%, B:0-50ppm, all the other are Fe.
Further be anti-copper pyrogenicity crack performance, corrosion resistance nature, welding property and comprehensive mechanical property through the optimization and improvement weathering steel of Si, C, S, B elemental composition scope.Wherein, C, S element interpolation scope are lower than 09CuPCrNi, and the interpolation scope of Si element is controlled at the upper limit of 09CuPCrNi composition range, has increased micro-B element.
2) the present invention also provides a kind of method of manufacture that latten is produced that is used for: get the raw materials ready, carry out then converter or electrosmelting, external refining, casting, slab reheat, controlled rolling, controlled chilling by said ratio; Slab adopts three sections heating processes in process furnace, first section: the preheating section board briquette preheats 1000～1050 ℃; Second section: the heating zone furnace gas temperature is set 1250～1300 ℃, makes board briquette fast through 1100～1200 ℃ of copper pyrogenicity crackle sensitive temperatures; The 3rd section: the soaking zone furnace gas temperature is set at 1200～1220 ℃, reduces tapping temperature, and slab can be reduced to rapidly below the copper pyrogenicity crackle sensitive temperature in temperature on the rolling line.
Further be that preheating section need guarantee that the slab preheating temperature reaches 1000 ℃; Heating zone need guarantee that board briquette can be rapidly above 1200 ℃; Soaking zone need guarantee that the slab tapping temperature is lower than 1220 ℃, and steel slab surface and the heart portion temperature difference are less than 20 ℃.
3) require control roughing first reduction in pass all to increase descaling process less than before and after 12%, the first passage roughing, the de-scaling water pressure need reach 18MPa～25MPa.The rich copper liquid phase of under the first passage small deformation draught condition, avoiding forming on the one hand helps the fragmentation of iron scale and thorough de-scaling subsequently simultaneously to the intravital infiltration of base.
The mechanism that relates to is following:
Improve the corrosion resistance nature aspect: Si helps refinement rusty scale tissue, reduces the whole erosion rate of steel; S can form sulfide inclusion, is prone in the corrosion process form pitting propagation, and corrosive nature is had disadvantageous effect; C content is crossed and can be caused forming in the alloy the relatively poor perlite of the relative ferritic of more corrosion resistance nature, the corrosion speed of accelerated material at most; P improves the most effectively one of alloying element of steel atmospheric corrosion resistance, and general P content is best 0.08%～0.15% o'clock solidity to corrosion, when P and Cu unite in the adding steel, can demonstrate better complex effect.
Overcome that copper causes surface heat crackle aspect in the course of hot rolling; Research shows that 1100-1200 ℃ is the sensitive temperature of Copper Bearing Steel copper pyrogenicity crackle, is below or above this temperature heating; Zone of oxidation and the copper enrichment of basal body interface place will obviously reduce; Therefore, through optimizing heating process and the rolling temperature control of slab in process furnace, make slab heating temperature can reduce the enrichment of the material surface of copper rapidly through copper pyrogenicity crackle sensitive temperature.In addition; Research also shows; Element such as B, Si helps suppressing Copper Bearing Steel surface heat crackle; And elements such as C, N are unfavorable for suppressing the research of surface heat crackle, add single certain alloying element but in research process, be mostly to adopt, and the present invention adopts multiple elemental composition to unite and adjusts and improves product surface quality.
Adopt the present invention to have the following advantages and effect: the present invention does not add the precious metal nickel element, does not increase other alloying element yet, adopts lower C, Si, the design of Mn composition.Compare with the high-grade weathering steel of 09CuPCrNi; Do not reduce Cu, P, the Cr constituent content that helps corrosion resistance nature; Go behind the nickel under the prerequisite that does not improve the production technique cost, only the corrosive nature and the surface quality of the control raising nickel-free weather-resistant steel latten of optimal control through alloying constituent and slab ME.The comprehensive mechanics of product, welding, corrosion resistance nature can substitute the high-grade weathering steel of 09CuPCrNi fully, and cost significantly reduces.The present invention can satisfy domestic most steel mill actual production conditions, need not change hot rolling line equipment and directly use.And can be used for producing the multi-assortment production such as tubing, sheet material of different diameter, thickness.
Description of drawings
Fig. 1 the present invention soaks after 0.5 hour in 3.5wt.%NaCl solution and measures polarization curve
Fig. 2 the present invention soaks after 10 days in 3.5wt.%NaCl solution and measures polarization curve
Embodiment
The chemical ingredients of the present invention and comparative example is as shown in table 1:
The chemical ingredients of table 1 the present invention and comparative example (wt%)
Each alloying constituent (wt%) of table 2 embodiment of the invention and comparative example
The preparation method of said low-cost weathering steel adopts electric furnace or the conventional smelting of converter, controls the content and the heating process of crucial alloying element.Actual rolling result sees that embodiment limit portion and surface quality are better from hot rolling, and the embodiment mechanical property is suitable with 09CuPCrNi.
Table 3 embodiment heating cycle
The mechanical property of table 4 embodiment and 09CuPCrNi
Fig. 1,2 pairs of polarization curve analytical resultss are seen table 5.Can find out that through reducing C, S element and increasing the Si element, two kinds of etching times corrosion resistance nature down all obviously is better than comparative example 09CuPTiRe among the embodiment, corrosion speed descends near 50%, and is similar basically with 09CuPCrNi, even the summary height.
The polarization curve calculation result of table 5 embodiment and comparative example
Claims (1)
1. nickel-free weather-resistant steel; It is characterized in that composition and weight percent content are: C:0.05-0.10%, Si:0.35-0.50%, Mn:0.38-0.50%, P:0.07-0.11%, S:＜0.010%, Cr:0.45-0.60%, Cu:0.25-0.45%, B:0-50ppm, N:＜0.0045%, all the other are Fe; Get the raw materials ready, carry out then converter or electrosmelting, external refining, casting, slab reheat, controlled rolling, controlled chilling by said ratio during manufacturing; Adopt three sections heating processes in the process furnace; First section: the preheating section board briquette preheats 1000～1050 ℃; Second section: the heating zone temperature is set 1250～1300 ℃, makes board briquette fast through 1100～1200 ℃ of copper pyrogenicity crackle sensitive temperatures, and the 3rd section: the soaking zone furnace gas temperature is set at 1200～1220 ℃; Need to guarantee that the slab tapping temperature be lower than 1220 ℃, and steel slab surface and the heart portion temperature difference are less than 20 ℃; Roughing first reduction in pass of controlled rolling is less than all increasing descaling process, de-scaling water pressure 18MPa～25MPa before and after 12%, the first passage roughing.
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| CN102127710B (en) * | 2011-04-07 | 2013-06-12 | 莱芜钢铁集团有限公司 | Chromium-free weather-resistant steel |
| CN102337470B (en) * | 2011-09-21 | 2014-04-30 | 首钢总公司 | Thin container plate and production method thereof |
| CN103878178B (en) * | 2014-03-04 | 2015-12-09 | 河北钢铁股份有限公司唐山分公司 | CSP produces the method for ultrathin hot rolled coiled sheet |
| CN105220063A (en) * | 2014-06-24 | 2016-01-06 | 上海梅山钢铁股份有限公司 | Resistance to marine environment steel of a kind of low cost and preparation method thereof |
| CN105436212B (en) * | 2014-09-25 | 2017-09-26 | 鞍钢股份有限公司 | Method for reducing heating gas consumption |
| CN104694713B (en) * | 2015-04-08 | 2017-03-01 | 首钢京唐钢铁联合有限责任公司 | Heating method of copper-containing low alloy steel |
| CN105063488B (en) * | 2015-07-30 | 2017-11-07 | 中国电力科学研究院 | It is a kind of for acid resistance soil corrosion steel of grounded screen and preparation method thereof |
| CN105239007B (en) * | 2015-11-25 | 2018-03-23 | 山东钢铁股份有限公司 | One kind is without nickel high tenacity weather-resistant steel plate and its manufacture method |
| CN106893950A (en) * | 2017-01-13 | 2017-06-27 | 唐山钢铁集团有限责任公司 | Low yield strength ratio cold rolling weather resisting steel and its production method |
| CN109234617A (en) * | 2018-09-12 | 2019-01-18 | 河钢股份有限公司承德分公司 | A kind of no nickel hot rolling thin gauge weathering steel volume and its production method |
| CN110284056B (en) * | 2019-06-17 | 2021-02-09 | 南阳汉冶特钢有限公司 | Corrosion-resistant steel plate for ocean platform and production method thereof |
| CN110527810B (en) * | 2019-08-28 | 2021-09-07 | 唐山钢铁集团有限责任公司 | Method for improving core toughness of thick plate by utilizing descaling box |
| CN114807730B (en) * | 2020-12-01 | 2024-02-23 | 广西柳州钢铁集团有限公司 | Nickel-free copper-phosphorus weather-resistant steel casting blank |
| CN113234994A (en) * | 2021-04-14 | 2021-08-10 | 马鞍山钢铁股份有限公司 | Hot-rolled high-strength weather-resistant steel plate with yield strength of 600MPa and production method thereof |
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| CN1752260A (en) * | 2005-10-10 | 2006-03-29 | 燕山大学 | Hot-rolling double-phase weather-resistant steel plate and mfg. method thereof |
| CN1970818A (en) * | 2006-12-08 | 2007-05-30 | 武汉钢铁(集团)公司 | High-strength weathering steel and method of manufacturing same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1752260A (en) * | 2005-10-10 | 2006-03-29 | 燕山大学 | Hot-rolling double-phase weather-resistant steel plate and mfg. method thereof |
| CN1970818A (en) * | 2006-12-08 | 2007-05-30 | 武汉钢铁(集团)公司 | High-strength weathering steel and method of manufacturing same |
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