CN107245662B - Sulfide denaturation method that is a kind of while improving sulphur system easy-to-cut structural steel mechanical performance and cutting ability - Google Patents

Sulfide denaturation method that is a kind of while improving sulphur system easy-to-cut structural steel mechanical performance and cutting ability Download PDF

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CN107245662B
CN107245662B CN201710313045.8A CN201710313045A CN107245662B CN 107245662 B CN107245662 B CN 107245662B CN 201710313045 A CN201710313045 A CN 201710313045A CN 107245662 B CN107245662 B CN 107245662B
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steel
sulfide
zirconium
mingled
mechanical performance
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CN107245662A (en
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王谦
郭银涛
何生平
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Chongqing University
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0006—Adding metallic additives
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0025—Adding carbon material
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/06—Deoxidising, e.g. killing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur

Abstract

The present invention provides sulfide denaturation method that is a kind of while improving sulphur system easy-to-cut structural steel mechanical performance and cutting ability, it is in deoxidation of molten steel, it goes to be mingled with, after the completion of the refining functions such as temperature adjustment, into sulphur system easy-to-cut structural steel molten steel, addition contains zircaloy, meet the chemical component (mass percentage) of molten steel: [C]=0.2 ~ 0.5%, [Si]=0.1 ~ 0.7%, [Mn]=0.5 ~ 2.0%, [Al]=0.01 ~ 0.05%, [S]=0.03 ~ 0.2%, [Zr]=0.03 ~ 0.15%, [N]≤0.005%, total oxygen (T.O)≤0.005%, Yu Weitie and impurity.The present invention utilizes stronger affinity between zirconium and element sulphur, by the MnS or (Mn of tufted in steel, Fe) S is mingled with the (Mn for being changed into discrete distribution, Zr) S is mingled with, reduce aggregation extent of the sulphide inculsion in as-cast structure, extending and deforming capacity of the sulfide in thermal deformation process is limited, the Morphology of Sulfide for rolling (forging) state is changed into fusiform by long ribbon shape, improves the sulphide inculsion pattern in sulphur system easy-to-cut structural steel and distribution.Reach while improving mechanical performance as a result, and improves the purpose of cutting ability.

Description

Vulcanization that is a kind of while improving sulphur system easy-to-cut structural steel mechanical performance and cutting ability Object denaturation method
Technical field
The invention belongs to steelmaking technical fields, are related to sulphur system easy-to-cut structural steel, and in particular to by improving sulfide shape State and make the mechanical performance of sulphur system easy-to-cut structural steel and cutting ability obtain coordinate promoted.
Background technique
Engineering steel is for manufacturing various component of machine, such as axis class, gear, fastener, spring, bearing etc. Deep deoxidation steel grade, these components are subjected to biggish load in use, and load is often extremely complex, it is desirable that zero Component has sufficiently high intensity, good plasticity, impact flexibility and preferable fatigue behaviour.Meanwhile manufacture above-mentioned mechanical zero Component, which generally requires, to be largely machined, and therefore, also requires it with good machinability.It improves and cuts at present Cutting the most common method of performance is that molten steel is made to increase sulphur, and this steel grade is sulphur system easy-to-cut structural steel.The most important skill of the steel grade Art difficult point and research emphasis are the coordination of mechanical performance and machinability.In the sulphur system easy-to-cut structural steel of deep deoxidation In, sulphide inculsion exists in the form of the tufted or large grained MnS or (Mn, Fe) S that are distributed along crystal boundary, this sulfide tool There is very strong deformability, often extends into long ribbon shape along the deformation direction of steel matrix, or even also retain as cast condition sulfide Tufted feature.This pattern and the sulphide inculsion of distribution are unfavorable for the promotion of components mechanical performance and service performance, bring The directionality of performance, is also unfavorable for the performance of cutting ability potentiality.It is synchronous improve sulphur system easy-to-cut structural steel mechanical performance and The key technology of cutting ability is to make the sulphide inculsion in product to be evenly distributed, size is tiny, pattern spindle.
Currently, there is many scholars to have studied the strong sulfide formation element such as calcium and rare earth to field trash in resulfurizing series free cutting steel The degenerative effects of form.But calcium or rare earth are added in the higher molten steel of sulfur content, can be just precipitated before pouring molten steel a large amount of High-melting-point sulfide --- calcium sulfide or vulcanization rare earth, seriously reduce the molding quality of molten steel, hinder industrial scale Production.Therefore, the technological means that sulphur system easy-to-cut structural steel is handled using calcium or rare earth is also limited only to laboratory research, Have no successful commercial scale with example.Zirconium and sulphur also have stronger affinity, but are far weaker than calcium and rare earth, and are better than Manganese, vulcanization zirconium are precipitated during molten steel solidification, will not deteriorate pouring molten steel ability because high-melting-point vulcanizes the precipitation of zirconium.
6649125 B2 of United States Patent (USP) US disclose it is a kind of with zirconium or (and) titanium improves to control oxide morphology in steel Machinability and the method for reducing workpiece roughness, the patent propose that the control range of Zr, Ti mass percentage is The control range of 0.01 ~ 3.0wt%, T.O mass percentage is 0.0005 ~ 0.005wt%.The patent (6649125 B2 of US) What is involved is ingredient (mass percentage) range be C=0.03 ~ 0.2wt%, Mn=0.5 ~ 3.0wt%, P=0.02 ~ 0.4wt%, S= Low-carbon sulphur system's automatic machine steel steel grade of 0.2 ~ 1.0wt%, Pb < 0.01wt%, the steel grade are very high to cutting ability requirement, and right Mechanical performance is generally used for manufacture clock pointers, spectacle frame, belt fastener etc. in use without being subjected to then without strict demand Larger, complex load product.The patent (6649125 B2 of US) adds the purpose of zirconium or titanium in low-carbon sulphur system automatic machine steel It is to make in steel while generating MnS and carbon sulphide inculsion, to realize the purpose for improving cutter life and workpiece surface quality.But It is that when only carrying out the zirconium or Ti Alloying of severe to molten steel, can just generate carbon sulphide inculsion, increase production cost；Steel In carbon sulphide inculsion be easy in the form of lath-shaped exist, to sacrifice steel toughness as cost, the cutting for improving steel adds Work performance.The patent (6649125 B2 of US) also specially makes molten steel phosphorous, further promotes cutting ability, but can be further So that steel is become fragile, promotes ductile-brittle transition temperature.To sum up, the invention thinking of the patent (6649125 B2 of US) is only applicable to machinery The not stringent low-carbon sulphur system automatic machine steel of performance requirement, and it is not suitable for the easy-to-cut structural stringent to mechanical property requirements Steel.
102912185 A of patent CN discloses a kind of bismuth zircaloy of high-strength simple-cutting steel alloying, in the alloy Contain part zirconium.The technological core of the patent of invention is to improve the cutting ability of steel by adding bismuth into steel.As it can be seen that steel is cut The improvement for cutting performance is mainly bismuth element bring, rather than the function of zirconium.But since the recovery rate of bismuth is low, and bismuth compromises steel Mechanical performance, therefore, the main function that zirconium is added into molten steel are to improve the recovery rate of bismuth using zr element and pass through improvement Inclusion morphology makes up the mechanical performance defect of steel.The patent does not refer to modified zirconia oxide morphology, and plays while mentioning The effect of high cutting ability and mechanical performance.Do not have any inspiration meaning to this patent.
Document (Bhattacharya D. Effect of sulfur and zirconium on the machinability and mechanical properties of AISI 1045 steels[J]. Metallurgical And Materials Transactions A, 1981,12 (6): 973-985.) sulfur content be 0.04wt%, Zirconium is added in the medium carbon steel of 0.09wt%, 0.12wt%, so that zirconium content is respectively 0.15wt%, 0.19wt%, 0.17wt%, in steel Inclusion morphology and mechanical performance be improved, but the hardly seen improvement of the machinability of steel.This may be by The oxygen content and nitrogen content of Yu Gangzhong is higher, and respectively 0.007 ~ 0.008wt%, 0.009 ~ 0.011wt% generate a large amount of height Hard ZrO2It is mingled with ZrN, is unfavorable for the raising of cutting ability, it is also possible to zirconium, sulfur content in the document and not up to most Good matching combination, fails so that cutting ability significantly improves.
About the sulphide inculsion form for being denaturalized sulphur system easy-to-cut structural steel by using zirconium processing, and then coordinate mechanical The relevant technologies of performance and cutting ability yet there are no related patents announcement and document report, temporarily in research blank field.
Summary of the invention
In view of the above shortcomings of the prior art and vacancy, the object of the invention is that providing one kind can improve simultaneously The sulfide denaturation method of sulphur system easy-to-cut structural steel mechanical performance and cutting ability is denaturalized sulphur system Cutting free using zirconium processing The sulphide inculsion form of structural steel, and then achieve the purpose that coordinate mechanical performance and cutting ability.
To achieve the goals above, the present invention adopts the following technical scheme: a kind of improve sulphur system easy-to-cut structural steel simultaneously The sulfide denaturation method of mechanical performance and cutting ability, which comprises the steps of:
After the completion of deoxidation of molten steel, going to be mingled with refining functions such as temperature adjustments, into molten steel, addition contains zircaloy, closes containing zirconium The additive amount of gold is 0.03 ~ 0.15wt% of molten steel total amount；The molten steel is sulphur system easy-to-cut structural steel molten steel, the chemistry of molten steel Ingredient wt% are as follows: [C]=0.2 ~ 0.5%, [Si]=0.1 ~ 0.7%, [Mn]=0.5 ~ 2.0%, [Al]=0.01 ~ 0.05%, [S]=0.03 ~ 0.2%, surplus is Fe and impurity.
Meanwhile the degenerative effects in order to guarantee sulfide, further prevent harmful field trash to want the influence of Steel Properties Ask: T.O mass percentage is lower than 0.005%；It is further ensured that the degenerative effects of sulphide inculsion, prevents that coarse ZrN is precipitated And deteriorating the mechanics and cutting ability of steel, the mass percentage of nitrogen in steel is lower than 0.005%.
For sulphur system easy-to-cut structural steel, mechanical performance can be improved by providing, and combine the sulphur of machinability Compound denaturation method.This programme is by the way that suitable zircaloy is added into steel, so that sulfur-bearing hypoxemia molten steel is formed in early solidification Vulcanization zirconium is mingled with, and is mingled with since vulcanization zirconium can be further formed (Mn, Zr) S solid solution with manganese sulfide, so that along crystal boundary aggregation point The rodlike sulphide inculsion denaturation of cloth is that the graininess of discrete distribution is mingled with, and greatly improves the shape of sulphide inculsion in as cast condition steel Looks and distribution reduce the thermoplasticity of sulfide simultaneously because being dissolved Zr element in sulfide, promote in hot rolling (forging) stick Sulphide inculsion spindle, to improve the mechanical performance and cutting ability of steel.When the mass percentage of zirconium is lower than When 0.03%, the zirconium content of sulfide is very low in steel, and can not play improves the distribution of as cast condition sulphide inculsion and limitation sulfide folder The effect of miscellaneous thermal deformation；However after the mass percentage of zirconium is higher than 0.15%, in steel the vulcanization zirconium of bulky grain easy to form and Along the Zr-Fe film of crystal boundary distribution, it is also degrading oxide morphology while increasing production cost, is unfavorable for steel mechanical performance With the promotion of cutting ability, therefore the OK range of zirconium mass percentage be 0.03 ~ 0.15%.Zr element belongs to strong oxygen Compound and nitride forming element, only when in steel oxygen content and nitrogen content be reduced to lower content level when, zirconium just it is organic It can be acted on element sulphur, play the metallurgical function of denaturation sulfide.If the T.O too high levels in steel, can generate a large amount of cluster Shape ZrO2It is mingled with, the T.O mass percentage in steel is controlled within 0.005%, can obviously reduce ZrO2The quantity being mingled with, suppression Tufted ZrO processed2The generation being mingled with；If the mass percentage of nitrogen in steel is higher than 0.005%, have during molten steel solidification A possibility that large scale ZrN is precipitated.Either ZrO2It is mingled with or ZrN is mingled with and belongs to high rigidity field trash, what these were mingled with In the presence of the mechanical performance and cutting ability that can all reduce steel.Therefore, be added into molten steel containing before zircaloy, it is necessary to molten steel into Row deep deoxidation makes deoxidation be mingled with abundant floating, while using corresponding control nitrogen measure, to increase the effective rate of utilization of zircaloy, Manufacturing cost is reduced, steel performance is improved.
Compared with prior art, the invention has the following beneficial effects:
1, the present invention is pressed from both sides the MnS of tufted in steel or (Mn, Fe) S using stronger affinity between zirconium and element sulphur Miscellaneous (Mn, Zr) S for being changed into discrete distribution is mingled with, and reduces aggregation extent of the sulphide inculsion in as-cast structure, limits The Morphology of Sulfide for rolling (forging) state is changed into spindle by long ribbon shape by extending and deforming capacity of the sulfide in thermal deformation process Shape improves the sulphide inculsion pattern in sulphur system easy-to-cut structural steel and distribution.Reach as a result, at the same improve mechanical performance and Improve the purpose of cutting ability.
2, the present invention proposes the control target of T.O and nitrogen content, and when proposing the zircaloy during liquid steel refining Machine and mode reduce the zirconium content in conjunction with oxygen, nitrogen to the greatest extent, and zr element is made to form (Mn, Zr) S sulphur in conjunction with element sulphur as far as possible Compound makes zirconium treatment effect reach optimization and economization.
3, the present invention is directed to sulphur system easy-to-cut structural steel, proposes reasonable zirconium processing intensity, ensure that sulfide denaturation effect Fruit achievees the purpose that while improving rolled steel mechanical performance and cutting ability.
4, compared with calcium, rare earth treatment means, zirconium processing means can avoid soaking because caused by generating high-melting-point sulfide Enter formula nozzle blocking problem.
Detailed description of the invention
Fig. 1 is to be mingled with pattern and distribution map in the as cast condition steel ingot of the embodiment of the present invention 1；
Fig. 2 is the shape characteristic figure of field trash in the hot forging stick of the embodiment of the present invention 1；
Fig. 3 is the relational graph of quenched the rod iron room temperature impact performance and zirconium content of the embodiment of the present invention 1；
Fig. 4 is the relational graph of quenched the rod iron room temperature impact performance directionality and zirconium content of the embodiment of the present invention 1；
Hard alloy cutter wear of the tool flank rate and rod iron zirconium when Fig. 5 is the quenched rod iron of the turning embodiment of the present invention 1 The relational graph of content.
Specific embodiment
Below by embodiment, technical solution of the present invention is described in further detail.
Sulfide denaturation method that is a kind of while improving sulphur system easy-to-cut structural steel mechanical performance and cutting ability, including such as Lower step: after the completion of deoxidation of molten steel, going to be mingled with refining functions such as temperature adjustments, into molten steel, addition contains zircaloy, closes containing zirconium The additive amount of gold is 0.03 ~ 0.15wt% of molten steel total amount；The molten steel is sulphur system easy-to-cut structural steel molten steel, the chemistry of molten steel Ingredient wt% are as follows: [C]=0.2 ~ 0.5%, [Si]=0.1 ~ 0.7%, [Mn]=0.5 ~ 2.0%, [Al]=0.01 ~ 0.05%, [S]=0.03 ~ 0.2%, surplus is Fe and impurity.
It is added containing after zircaloy, the chemical component wt% of molten steel meets: [C]=0.2 ~ 0.5%, [Si]=0.1 ~ 0.7%, [Mn]= 0.5 ~ 2.0%, [Al]=0.01 ~ 0.05%, [S]=0.03 ~ 0.2%, [Zr]=0.03 ~ 0.15%, surplus is Fe and impurity.
Embodiment 1:
The sulphur system easy-to-cut structural steel molten steel that different zirconium contents are melted out on vaccum sensitive stove, using MgO matter crucible.Root The steel grades requirement that structural steel is easily cut according to general sulphur system, is added suitable elemental silicon and aluminum shot in ingot iron, to reach To the purpose of deep deoxidation；After molten steel fusing is uniform, graphite, ferrous sulfide adjustment carbon, sulfur content are added, electrolysis is eventually adding Manganese and sponge zirconium, after molten steel stirs 3 min, injection diameter is 130 mm, height is about solidification cooling in the ingot mould of 300 mm Sky is broken afterwards.Molten steel composition matrix is Fe, remaining composition is as shown in table 1.
Mass percentage/wt% of essential element in 1. molten steel of table
Number C Mn Si S Zr Al T.O N
B-1 0.30 1.30 0.14 0.081 - 0.018 0.0044 0.0019
B-2 0.38 1.48 0.18 0.091 0.008 0.013 0.0045 0.0016
B-3 0.39 1.50 0.19 0.094 0.024 0.015 0.0048 0.0016
B-4 0.35 1.33 0.22 0.085 0.039 0.02 0.0037 0.0019
B-5 0.42 1.52 0.23 0.097 0.087 0.022 0.0058 0.0028
B-6 0.40 1.49 0.15 0.095 0.14 0.019 0.0040 0.0029
B-7 0.35 1.46 0.17 0.110 0.25 0.023 0.0035 0.0015
Fig. 1 shows the pattern and distribution characteristics of the sulphide inculsion in steel ingot.It can be seen from figure 1 that with zirconium in steel Mass percentage increase, Morphology of Sulfide first by a tufted for accumulation type be mingled with (MnS or (Mn, Fe) S) be changed into from The graininess for dissipating distribution is mingled with ((Mn, Zr) S solid solution))；However, being opened in steel after the mass percentage of zirconium is higher than 0.15% Beginning occurs that quantity is more, and larger-size white granular is mingled with, and finds through spectroscopy detection, this to be mingled with to vulcanize zirconium.Work as zirconium Mass percentage be higher than 0.15% after, can also observe that lath-shaped is mingled with and along crystal boundary point respectively in two-dimensional surface and fracture The flake of cloth is mingled with, this kind of to be mingled with for Zr-Fe alloy phase.Since the mass percentage of T.O and nitrogen in steel ingot are below 0.005%, do not observed in steel ingot tufted or individual ZrO2It is mingled with, does not also find that large-sized ZrN is mingled with.
Fig. 2 shows inclusion morphology feature of the steel ingot after being hot-forged, and the steel plane in figure is parallel to steel thermal deformation side To.As can be seen from Figure 2, with the increase of zirconium content in steel, the aggregation extent for forging state field trash obviously weakens；When the quality of zirconium When percentage composition is greater than 0.039%, the length-width ratio of field trash is obviously reduced, and has basically reached the purpose of spindle, grey black in steel Field trash be (Mn, Zr) S solid solution be mingled with；After the mass percentage of zirconium is greater than 0.15%, there is white in bar Catena shape is mingled with, this is mutually formed in thermal deformation process fragmentation by vulcanization zirconium and Zr-Fe alloy.
The room temperature tensile properties and zirconium content of quenched and tempered state rod iron are without obvious relation, but the direction of impact flexibility and impact flexibility Property and cutting ability and zirconium content are closely related.Fig. 3 and Fig. 4 respectively illustrate impact flexibility, the directionality of impact flexibility with The relationship of zirconium content.By in Fig. 3 and Fig. 4 as it can be seen that sulphur system easy-to-cut structural steel carry out the processing of suitable zirconium can improve impact it is tough Property, the directionality of impact flexibility is reduced, suitable zirconium content (mass percent) is 0.03 ~ 0.15%.Fig. 5 is zirconium content to hard The influence of matter alloy cutter wear of the tool flank rate, it is seen that when the mass percentage of zirconium in steel be in above range (0.03 ~ 0.15%) when, the rate of depreciation of flank can be also significantly reduced, improves machinability.
By embodiment 1 it is found that handling intensity using suitable zirconium, by the control of the mass percentage of zirconium 0.03 ~ In 0.15% range, it may make the oxide morphology in the sulphur system easy-to-cut structural steel of [S] ≈ 0.1% to control rationally, can change simultaneously The mechanical performance and cutting ability of kind steel.
Embodiment 2:
Commerical test has been carried out by following smelting mode in iron and steel enterprise.The refinery practice process of molten steel be BOF → LF → VD → CC uses aluminium deoxidation in tapping process, and lime and CaO-Al is added2O3It is that pre-melted slag carries out wash heat, feeds aluminium in LF furnace Line carries out deep deoxidation and fine tuning aluminium content, while adjusting other alloying components, increases bottom blowing stirring steel slag and deoxidation is promoted to be mingled with Floating and denaturation, VD stove evacuation deaerate, successively feeding sulphur core wire and Si-Zr alloy core wire, after 20 ~ 30min of soft blow, hang toward even Casting platform is poured.Even 6 furnaces or more can be stably reached to the molten steel of single tundish by pouring ability, and immersion does not occur in casting process The mouth of a river stores the phenomenon that tumor.
Above-mentioned commerical test is carried out for multiple sulphur system easy-to-cut structural steel grades, ladleful is 50 ~ 150t, steel grade Composition range (mass percentage) covering: [C]=0.2 ~ 0.5%, [Si]=0.1 ~ 0.7%, [Mn]=0.5 ~ 2.0%, [Al]=0.01 ~ 0.05%, [S]=0.03 ~ 0.2%, wherein zirconium content is 0.03 ~ 0.15%, and [N]≤0.005%, total oxygen (T.O)≤0.005% is remaining Amount is Fe and impurity.Compared with original product, Morphology of Sulfide and distribution in slab and in stocking are significantly improved, stocking The grading that middle A class is mingled with by 4.0 grades of original product be reduced to existing 2.5 grades hereinafter, the spindle field trash ratio in stocking mentions High by 30% or more, the room temperature impact toughness of stocking promotes 20% or more, and the directionality of impact flexibility reduces 35% or more, turning The processing hard alloy cutter service life used at least promotes 10%.
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although referring to compared with Good embodiment describes the invention in detail, those skilled in the art should understand that, it can be to skill of the invention Art scheme is modified or replaced equivalently, and without departing from the objective and range of technical solution of the present invention, should all be covered at this In the scope of the claims of invention.

Claims (1)

1. a kind of sulfide denaturation method for improving sulphur system easy-to-cut structural steel mechanical performance and cutting ability simultaneously, feature exist In including the following steps:
The refinery practice process of molten steel is BOF → LF → VD → CC, uses aluminium deoxidation in tapping process, and lime and CaO- is added Al2O3Be pre-melted slag carry out wash heat, LF furnace feeding aluminum steel carry out deep deoxidation and fine tuning aluminium content, while adjust other alloys at Point, increase bottom blowing stirring steel slag and deoxidation promoted to be mingled with floating and denaturation, the degassing of VD stove evacuation, successively feed sulphur core wire and Si-Zr alloy core wire after 20 ~ 30min of soft blow, hangs toward continuous casting platform and is poured；
The chemical component wt% of molten steel are as follows: [C]=0.2 ~ 0.5%, [Si]=0.1 ~ 0.7%, [Mn]=0.5 ~ 2.0%, [Al]=0.01 ~ 0.05%, [S]=0.03 ~ 0.2%, wherein zirconium content is 0.03 ~ 0.15%, [N]≤0.005%, total oxygen (T.O)≤0.005%, surplus For Fe and impurity.
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