CN105803308A - Magnesium and calcium-containing 45MnVS free machining quenched and tempered steel and manufacturing method thereof - Google Patents

Magnesium and calcium-containing 45MnVS free machining quenched and tempered steel and manufacturing method thereof Download PDF

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CN105803308A
CN105803308A CN201610163261.4A CN201610163261A CN105803308A CN 105803308 A CN105803308 A CN 105803308A CN 201610163261 A CN201610163261 A CN 201610163261A CN 105803308 A CN105803308 A CN 105803308A
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steel
45mnvs
calcium
magnesium
quenched
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CN105803308B (en
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付建勋
朱玉员
李徐
刘辉
龚涛
李健
胡德林
徐杰
张明
吴彦欣
曹中佳
谢欣悦
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University of Shanghai for Science and Technology
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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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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
    • C21C7/076—Use of slags or fluxes as treating agents
    • 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
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Abstract

The invention provides magnesium and calcium-containing 45MnVS free machining quenched and tempered steel and a manufacturing method thereof. The steel comprises the main components of 0.42% to 0.51% of C, 0.15% to 0.6% of Si, 0.90% to 1.50% of Mn, 0.010% to 0.035% of P, 0.040% to 0.080% of S, 0.06% to 0.13% of V, 0.0005% to 0.008% of Mg, 0.01% to 0.04% of Al, 0.0008% to 0.005% of Ca, and the balance being Fe and unavoidable impurities. According to the magnesium and calcium-containing 45MnVS free machining quenched and tempered steel and the manufacturing method thereof, though adopting converter control smelting, LF+VD magnesium calcium compounded inclusion form treatment modification, M-EMS+F-EMS composite continuous casting and controlled rolling and controlled cooling, and adding a trace amount of magnesium and calcium on the basis of traditional 45MnVS steel, the sulfur-containing inclusion is modified, the material strength index is equivalent to the quenching and tempering condition of No.45 steel, and the calcium-containing 45MnVS free machining quenched and tempered steel has machinability and fatigue resistance better than the 45MnVS steel, and is applicable to parts and structural parts such as automobile connecting rods, crank shafts, knuckle spindles, drive shafts and front axles.

Description

A kind of 45MnVS easy-cutting untempered steel containing magnesium calcium and manufacture method thereof
Technical field
The present invention relates to field of steel metallurgy, a kind of non-hardened and tempered steel and production technology thereof, relate to a kind of containing Mg- The easy-cutting untempered steel of Ca and and manufacture method.
Background technology
Easy-cutting untempered steel is by methods such as the Strengthening and Toughening such as microalloying, controlled rolling and controlled cooling, S, Pb machinings, cancels Tempering and Quenching, reaches or the class high-quality that close to quenched and tempered steel mechanical property and has free-cutting machinability or very special quality structure Steel.Easy-cutting untempered steel is widely used in part and the structures such as such as automobile connecting bar, bent axle, knuckle spindle, drive shaft, propons Part, and consumption increases day by day, is the Typical Representative of automobile steel, has catered to machining constantly to automatization, high speed and essence Densification direction is developed easy-cutting untempered steel is proposed the requirement improving processing characteristics and higher intensity, along with refinery practice, Microalloying controls technology, the development of Controlled Rolling And Controlled Cooling, and the range of easy-cutting untempered steel is more extensive, relates to build Build, the field such as heavy-duty machinery, high-pressure delivery pipeline, bridge, achieve significant energy-conservation effect.
Non-hardened and tempered steel is accompanied by the oil crisis in 70 years 20th century, causes energy shortage in the world and fast development The energy-efficient steel of one, owing to it has the advantages such as the saving energy, material, minimizing quenching distortion cracking, technique are simple, at present Paid close attention to by countries in the world.At present, many forging the most widely used non-hardened and tempered steel manufactures on Foreign Automobile；Internal vapor depot also exists Exploitation application non-hardened and tempered steel or Introduced From Abroad non-hardened and tempered steel manufacturing technology.Compare with quenched and tempered steel, the tradition non-tune of forge hot The intensity of matter steel is preferable, but toughness deficiency and not Cutting free, limit its extensive application, therefore, easy-cutting untempered steel Development priority is to improve toughness on the basis of proof strength and give its excellent free-cutting machinability.
Production technology difficult point is that oxygen content in steel, the absorbance of element sulphur and close limit, field trash are tiny, the most harmless Change process and the control of strand macrostructure.Conventionally employed electric furnace → LF → continuous casting → controlled rolling and controlled cooling or converter → LF → continuous casting → Controlled rolling and controlled cooling the degree of purity of sulphur free-cutting steel produced with Al deoxidization technique is poor, composition is uneven with temperature, nitrogen hydrogen content height And the cotton-shaped oxide of Al easily to block mouth of a river castability poor.In order to overcome these difficulty shortcoming, the present invention propose use converter → LF → VD → continuous casting → controlled rolling and controlled cooling is also combined modifying process production sulfur-bearing easy-cutting untempered steel with Ca-Mg, is ensureing machinery On the premise of performance, and then improving the machinability of steel, can significantly improve steel degree of purity, uniformity simultaneously, raising can be watered Property.
The Chinese patent of Publication No. CN1667129A discloses the production method of a kind of sulfur-bearing easy-cutting untempered steel, steel Component (percentage by weight) be: C 0.10 ~ 0.35%, Si 0.15 ~ 0.45%, Mn 0.60 ~ 1.50%, P≤0.03%, S≤ 0.045%,Cr 0.80~1.50%,Ti 0.03~0.12%,Al 0.01~0.10%,Ni0~0.30%,Mo0~0.20%,Cu0~ 0.20%, N 0.004 ~ 0.015%, iron surplus.The place that the present patent application is different from above-mentioned patent is: the present patent application does not contains Ti and by magnesium calcium modify inclusion morphology.
The Chinese patent of Publication No. CN101255535 discloses a kind of Ca-S and is combined easy-cutting untempered steel and life thereof Production. art, C:0.44～0.49%, S:0.040～0.065%, Si:0.30～0.60%, P≤0.035%, Mn:1.20 ～1.50%, Ca:0.001～0.010%, V:0.08～0.12%, Al:0.01～0.03%, Cr, Ni, Cu≤ More than 0.30% is Fe and inevitable impurity.The place that the present patent application is different from above-mentioned patent is: the application magnesium calcium changes Matter, Mg:0.0005%～0.008%, Al:0.001%～0.04%, Ca:0.0008%～0.005%, and the application is in work VD process is used in skill.
Publication No. CN104264040A non-hardened and tempered steel and manufacture method thereof and use this non-hardened and tempered steel to manufacture Bent axle, its chemical elements in percentage by mass is: C:0.37～0.43%, Si:0.55～0.65%, Mn:1.46～1.56%, V:0.07～0.13%, Nb:0.015～0.035%, N:0.012～0.017%;Surplus is that ferrum is the most miscellaneous with other Matter.The place that the present patent application is different from above-mentioned patent is: the present patent application does not add Nb and uses magnesium calcium to modify, Mg: 0.0005%～0.008%, Ca:0.0008%～0.005%, and the application uses VD process in technique.
Summary of the invention
The present invention is directed to the deficiency of existing technique and the requirement that manufacturing industry is the highest to material, change by Mg-Ca is compound Matter processes to be provided in a kind of sulfur-bearing, magnesium easy-cutting untempered steel and production method thereof, and then modification sulfur-bearing easy-cutting untempered steel Sulphide inculsion, thus improve inclusion morphology, and then the mechanical performance of steel and cutting ability.The composition of this non-hardened and tempered steel It is by weight percentage: C:0.42%～0.51%, Si:0.15%～0.6%, Mn:0.90%～1.50%, P: 0.010%～0.035%, S: 0.040%～0.080%, V: 0.06%～0.13%, Mg:0.0005%～0.008%, Al:0.01%～0.04%, Ca:0.0008%～0.005%, surplus is Fe and inevitable impurity.
It is an object of the invention to be achieved through the following technical solutions:
A kind of sulfur-bearing, magnesium, the easy-cutting untempered steel of calcium and smelting process thereof, the composition of this non-hardened and tempered steel is by weight percentage For: C:0.42%～0.51%, Si:0.15%～0.6%, Mn:0.90%～1.50%, P:0.010%～0.035%, S : 0.040%～0.080%, V: 0.06%～0.13%, Mg:0.0005%～0.008%, Al:0.01%～0.04%, Ca:0.0008%～0.005%, surplus is Fe and inevitable impurity.
The effect of each element of the present invention:
The height of C: carbon content has critically important impact to strong hardness and the plasticity and toughness of steel.In all elements, carbon improves The ability of intensity is maximum, and quenched and tempered steel is strengthened effect and is about 5 times of silicon by carbon, 9 times of chromium and 18 times of manganese, so being Ensure that pinion steel has enough intensity, hardness, must be containing suitable carbon content in steel.The general gear steel capital is contained more Alloying element, many of which carbide former can with carbon formed MoC, (Fe, Cr)3C、Cr7C3Deng carbide.Alloy Carbide separates out in drawing process and produces post-curing effect, the hardness of material can be made to improve further, thus have relatively High intensity and good anti-wear performance.
Si: if silicon can control the deoxidation degree of pinion steel as deoxidizer, be affect in steel sulphide inculsion deformation and The key element of cutting ability, is the most also one of element deteriorating cutting rolled steel performance.Silicon can improve the through hardening of infiltration layer strongly Property, but in carburizing process, be susceptible to grain boundary oxidation and form the netted defect of black;With the increase of alloying element addition, steel Martensite point decline, make after quenching in infiltration layer containing abundant residues austenite, affect fatigue behaviour and the wearability of part.
Mn: manganese can improve the nucleating work of pearlite and change activation energy, reduces nucleation rate and coarsening rate, the manganese of pearlite Element and carbide thereof are dissolved in austenite, make austenite isothermal transformation diagram move to right, and increase overcooling austenite stability, suppression Perlitic transformation, improves quenching degree, and the MnS that manganese generates with the sulfur in steel is a kind of important free-cutting phase, can help improve Cutting ability.In order to ensure good cutting ability and mechanical property, the present invention controls the content of manganese 0.8 ~ 1.6%.
P: be considered as a kind of harmful element for structural steel phosphorus, but in flat cold-rolled sheet, it can be utilized to be dissolved in ferrite And significantly improve intensity, and it is the cold brittleness avoiding phosphorus simultaneously, phosphorus content general control is below 0.10%.
S: S≤0.025% of general low-sulfur steel, middle sulfur steel S=0.04～0.09%, high-sulfur steel S=0.10～0.30%.Wherein Middle sulfur steel, owing to having good cutting ability and mechanical property, has been widely used in commercial production, high-sulfur steel be then for Meet the steel of special cutting ability demand.For ordinary steel, trace increases sulfur just can play the obvious effect improving machinability Really.Research shows that field trash glomeration or fusiform are more beneficial for cutting than linear.Can by automatic steel add calcium, The unit such as rare earth and titanium usually reaches to change the purpose of sulphide shape.Should ensure that in steel that there is certain manganese sulfur ratio simultaneously, reduce The adverse effect brought because sulfur content is too high in steel, protects the mechanical property levying steel.The principle of composition design is to ensure Under conditions of the mechanical performance of steel is basically unchanged, improve its cutting ability.But MnS easily stretches along rolling direction when hot rolling simultaneously Long, reduce the horizontal mechanical performance of steel.Therefore the present invention controls sulfur content is 0.040% ~ 0.08%.
V: vanadium is the most frequently used and effectively strengthens micro alloying element, and it is mainly by forming V(C, N) affect steel Tissue and performance.V(C, N) main Precipitation in the ferrite of austenite grain boundary, fining ferrite grains, increase steel Intensity.After adding a small amount of vanadium in steel, vanadium is combined formation V(C, N with carbon and " freely " nitrogen) compound, reduce " oneself in steel By " nitrogen content, make steel possess unstrained ageing.The carboritride of vanadium has crystal grain thinning increases the effect of intensity, by force Degree linearly increases with the increase of content of vanadium, if content of vanadium is more than 0.15%, the most unfavorable to its toughness.The interpolation of vanadium in steel Amount general control is 0.08%～0.13%.
Al: aluminum is usually and adds in metal as deoxidizer, but be also a kind of micro alloying element for in steel Nitrogen combines.With the decline of temperature in cooling procedure, aluminum dissolubility in austenite reduces and separates out the nitride of aluminum, plays resistance Only Austenite Grain Growth effect.Promote that when γ → α phase transformation heterogeneous nucleation accelerates austenite and changes and fining ferrite Crystal grain.For preferably crystal grain thinning, refine is used to feed Al line mode, conservative control wire-feeding velocity and line feeding opportunity so that acid Molten aluminum content can stability contorting within the scope of internal control.
Ca: during solidification of molten steel, the oxidation product of calcium, as sulfide forming core core, can promote the analysis of sulfide Go out and being uniformly distributed of sulfide.By adding oxide morphology control element in steel, such as tellurium, selenium, titanium, calcium or rare earth metal Deng and control oxygen content in steel, steel inclusion is formed fusiform with improve steel machinability.General calcium metal or calcium Silicon alloy deoxidizer replaces metallic aluminium to carry out deoxidation.General simple calcium and easy-cutting steel is rarely employed, and calcium-sulfur or calcium-sulfur-lead are combined Automatic steel is the most universal.
Mg: magnesium is the metallic element more active than AI, and will not be formed as magnesium oxide is cotton-shaped be mingled with blocking the mouth of a river.At steel In liquid process of setting, its oxidation product, as the forming core core of sulfide, can promote the precipitation of sulfide and be uniformly distributed.Magnesium Change oxide morphology can also be played, formed magnesium oxide be core Manganese monosulfide. be that the spindle of cover layer is mingled with, thus improve easily Machinability.
(chemical formula one) [Mg]+[O]=MgO (s) △ G1 θ=-731400+239.68T
(chemical formula two) 2 [Al]+3 [O]=Al2O3(s) △G3 θ=-1202070+386.28T
(chemical formula three) [Mg]+[S]=MgS (s) △ G2 θ=-537258.5+205.77T
(chemical formula four) [Ca]+[S]=CaS (s) △ G1 θ=-541158.26+193.33T
(chemical formula five) MgO (s)+Al2O3(s)=MgO·Al2O3(s) △G4 θ=-35600-2.09T
(chemical formula six) [Mg]+4 [O]+2 [Al]=MgO Al2O3(s) △G5 θ=-1969070+623.87T
By the thermodynamical equilibrium relation of Mg, Ca, O, S, when can obtain 1873K balance, in steel, [Mg], [Ca], [O], the concentration of [S] are closed System.
A kind of production technology of calcic sulfur magnesium easy-cutting untempered steel, it is characterised in that: this technique include smelt, continuous casting and Rolling process, its technological process is:
(1) smelt and alloying: converter molten iron does not carry out desulfurization, only decarburization and phosphorus, tap 1/4 time by silicomanganese ferrosilicon vulcanize Ferrum order addition carries out weak deoxidation, and Control for Oxygen Content is at 30-100ppm；
(2) LF stove refine: add refining slag, submerged arc slag, add iron sulfide control sulfur content, carry out white slag process, the LF later stage to Adding silicon magnesium calcium alloy line in steel and carry out Mg-Ca Combined Processing and field trash modification, wire-feeding velocity controls at 95-120m/min also Controlling suitable Ca/S, Mg/S, Ca/S controls to control at 0.010-0.050 at 0.010-0.050, Mg/S, it is ensured that chemical composition Meet design requirement；
(3) vacuum refining: for ensureing Cutting free inclusion morphology in steel, carry out vacuum outgas, and then realize stablizing of element sulphur Control and improve sulphide inculsion spindle rate, in steel, adding S line after vacuum breaker, make S content up to standard；
(4) cast: whole process carries out molding casting, controls the degree of superheat and is 25-40 DEG C, and continuous casting casting speed is 0.7-1.20 m/ Min, weak cold but guarantees continuous casting billet quality, and M-EMS running current is 250-280A, and frequency is 2.5-3.5HZ, Optimal end electromagnetic agitation running current is 150-180A, and frequency is 10.0-13HZ；
(5) controlled rolling and controlled cooling: steel billet is 1050-1200 DEG C in the soaking temperature of heating furnace, start rolling temperature 1100-1150 DEG C, finish to gauge Temperature 900-1000 DEG C；Rolling rear steel rate of cooling is 2 DEG C/s.
The technological process of production of a kind of 45MnVS easy-cutting untempered steel containing magnesium calcium is:
Converter smelting → LF refine → VD → continuous casting → strand cold → inspection → blank examination → heating → de-scaling → rolling in hole → Shear or sawing → cheat cold → aligning → reconditioning → product inspection → packing indicates → weighs.
Production technology difficult point is that oxygen content in steel, the absorbance of element sulphur and close limit, field trash are tiny, the most harmless Change process and the control of strand macrostructure.Conventionally employed electric furnace → LF → continuous casting → controlled rolling and controlled cooling or converter → LF → continuous casting → Controlled rolling and controlled cooling the degree of purity of sulphur free-cutting steel produced with Al deoxidization technique is poor, composition is uneven with temperature, nitrogen hydrogen content height And the cotton-shaped oxide of Al easily to block mouth of a river castability poor.In order to overcome these difficulty shortcoming, the present invention propose use converter → LF → VD → continuous casting → controlled rolling and controlled cooling is also combined modifying process production sulfur-bearing easy-cutting untempered steel with Mg-Ca, is ensureing machinery On the premise of performance, and then improving the machinability of steel, can significantly improve steel degree of purity, uniformity simultaneously, raising can be watered Property.
Detailed description of the invention
Embodiment 1:
A kind of production technology of the 45MnVS easy-cutting untempered steel containing magnesium calcium:
It is further preferred that Mg-Ca is combined the preparation method of easy-cutting untempered steel, conform in the chemical composition ensureing steel In the case of asking, carry out following steps:
(1) smelt and alloying: converter molten iron does not carry out desulfurization, only decarburization and phosphorus, tap 1/4 time by silicomanganese ferrosilicon vulcanize Ferrum order addition carries out weak deoxidation, and Control for Oxygen Content is at 45ppm；
(2) LF stove refine: add refining slag, submerged arc slag, adds iron sulfide and controls sulfur content, carry out white slag process, after LF Phase adds silicon magnesium calcium alloy line in steel and carries out Mg-Ca Combined Processing and field trash modification, and wire-feeding velocity controls at 100m/min And controlling suitable Ca/S, Mg/S, Ca/S controls 0.040, Mg/S controls 0.035, it is ensured that chemical composition meets design and wants Ask；
(3) vacuum refining: for ensureing Cutting free inclusion morphology in steel, carry out vacuum outgas, and then realize stablizing of element sulphur Control and improve sulphide inculsion spindle rate, in steel, adding S line after vacuum breaker, make S content up to standard；
(4) cast: whole process carries out molding casting, controlling the degree of superheat is 30 DEG C, and continuous casting casting speed is 1 m/min, weak cold but Guaranteeing continuous casting billet quality, two cold specific waters are about 0.3L/Kg, and M-EMS running current is 260A, and frequency is 3.0HZ, optimal end electromagnetic agitation running current is 170A, and frequency is 12HZ；
(5) controlled rolling and controlled cooling: steel billet is 1200 DEG C in the soaking temperature of heating furnace, 2.5 hours heat time heating times, start rolling temperature 1130 DEG C, finishing temperature 950 DEG C.Rolling rear steel rate of cooling is 2 DEG C/s, the lower cold temperature of cold bed heap 700 DEG C.

Claims (2)

1. the 45MnVS easy-cutting untempered steel containing magnesium calcium, it is characterised in that this composition of steel is by weight percentage: C: 0.42%～0.51%, Si:0.15%～0.6%, Mn:0.90%～1.50%, P:0.010%～0.035%, S: 0.040%～0.080%, V: 0.06%～0.13%, Mg:0.0005%～0.008%, Al:0.01%～0.04%, Ca:0.0008%～0.005%, surplus is Fe and inevitable impurity.
2. the manufacture method of the 45MnVS easy-cutting untempered steel containing magnesium calcium as claimed in claim 1, it is characterised in that concrete Production technology as follows:
(1) smelt and alloying: converter molten iron does not carry out desulfurization, only decarburization and phosphorus, tap 1/4 time by silicomanganese ferrosilicon vulcanize Ferrum order addition carries out weak deoxidation, and Control for Oxygen Content is at 30-100ppm；
(2) LF stove refine: add refining slag, submerged arc slag, add iron sulfide control sulfur content, carry out white slag process, the LF later stage to Adding silicon magnesium calcium alloy line in steel and carry out Mg-Ca Combined Processing and field trash modification, wire-feeding velocity controls at 95-120m/min also Controlling suitable Ca/S, Mg/S, Ca/S controls to control at 0.010-0.050 at 0.010-0.050, Mg/S, it is ensured that chemical composition Meet design requirement；
(3) vacuum refining: for ensureing Cutting free inclusion morphology in steel, carry out vacuum outgas, and then realize stablizing of element sulphur Control and improve sulphide inculsion spindle rate, in steel, feeding S line after vacuum breaker, make S content up to standard；
(4) cast: whole process carries out molding casting, controls the degree of superheat and is 25-40 DEG C, and continuous casting casting speed is 0.7-1.20 m/ Min, weak cold but guarantees continuous casting billet quality, and M-EMS running current is 250-280A, and frequency is 2.5-3.5HZ, Optimal end electromagnetic agitation running current is 150-180A, and frequency is 10.0-13HZ；
(5) controlled rolling and controlled cooling: steel billet is 1050-1200 DEG C in the soaking temperature of heating furnace, start rolling temperature 1100-1150 DEG C, finish to gauge Temperature 900-1000 DEG C；Rolling rear steel rate of cooling is 2 DEG C/s.
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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107287504A (en) * 2017-06-16 2017-10-24 上海大学 The middle carbon easy-cutting non-hardened and tempered steel and its manufacturing technique method of sulfur-bearing, tellurium
CN107312907A (en) * 2017-06-05 2017-11-03 苏州大学 In a kind of control in low-sulfur low-oxygen steel manganese sulfide form method
CN107760824A (en) * 2017-09-15 2018-03-06 上海大学 The smelting process that sulphide inculsion modifies in non-hardened and tempered steel or pinion steel
CN109234626A (en) * 2018-07-18 2019-01-18 石家庄钢铁有限责任公司 A kind of Cutting free heavy-load automobile hub bearing steel and manufacturing method
CN109735684A (en) * 2019-02-18 2019-05-10 山东钢铁股份有限公司 A method of improving Tempered Steel Containing Sulphur castability and transverse impact toughness
CN109988883A (en) * 2019-04-09 2019-07-09 上海大学 The magnesium calcium adding technology method of the non-hardened and tempered steel of calcium containing magnesium
CN111286678A (en) * 2020-04-08 2020-06-16 中天钢铁集团有限公司 High-sulfur non-quenched and tempered steel for automobile camshaft and production process thereof
CN111318659A (en) * 2020-02-29 2020-06-23 邯郸钢铁集团有限责任公司 Method for solving nozzle blockage of high-sulfur free-cutting gear steel produced by continuous casting of small square billets
CN111876689A (en) * 2020-09-08 2020-11-03 鞍钢股份有限公司 Low-carbon selenium-containing free-cutting steel for instruments and manufacturing method thereof
CN112195305A (en) * 2020-09-17 2021-01-08 南京钢铁股份有限公司 Method for refining grain size of sulfur-containing non-quenched and tempered steel
CN113957338A (en) * 2021-10-09 2022-01-21 南京钢铁股份有限公司 Magnesium-containing 45 steel and preparation process thereof
CN115369324A (en) * 2022-09-05 2022-11-22 包头钢铁（集团）有限责任公司 38MnVS5 rare earth free-cutting hot-rolled round steel for automobiles and preparation method thereof
EP4036266A4 (en) * 2019-09-27 2023-06-14 Baoshan Iron & Steel Co., Ltd. Steel for alloy structure and manufacturing method therefor

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Publication number Priority date Publication date Assignee Title
CN107312907A (en) * 2017-06-05 2017-11-03 苏州大学 In a kind of control in low-sulfur low-oxygen steel manganese sulfide form method
CN107287504B (en) * 2017-06-16 2019-06-04 上海大学 The middle carbon easy-cutting non-hardened and tempered steel and its manufacturing technique method of sulfur-bearing, tellurium
CN107287504A (en) * 2017-06-16 2017-10-24 上海大学 The middle carbon easy-cutting non-hardened and tempered steel and its manufacturing technique method of sulfur-bearing, tellurium
CN107760824A (en) * 2017-09-15 2018-03-06 上海大学 The smelting process that sulphide inculsion modifies in non-hardened and tempered steel or pinion steel
CN107760824B (en) * 2017-09-15 2019-10-11 上海大学 The smelting process that sulphide inculsion modifies in non-hardened and tempered steel or pinion steel
CN109234626A (en) * 2018-07-18 2019-01-18 石家庄钢铁有限责任公司 A kind of Cutting free heavy-load automobile hub bearing steel and manufacturing method
CN109735684A (en) * 2019-02-18 2019-05-10 山东钢铁股份有限公司 A method of improving Tempered Steel Containing Sulphur castability and transverse impact toughness
CN109988883A (en) * 2019-04-09 2019-07-09 上海大学 The magnesium calcium adding technology method of the non-hardened and tempered steel of calcium containing magnesium
EP4036266A4 (en) * 2019-09-27 2023-06-14 Baoshan Iron & Steel Co., Ltd. Steel for alloy structure and manufacturing method therefor
CN111318659A (en) * 2020-02-29 2020-06-23 邯郸钢铁集团有限责任公司 Method for solving nozzle blockage of high-sulfur free-cutting gear steel produced by continuous casting of small square billets
CN111286678A (en) * 2020-04-08 2020-06-16 中天钢铁集团有限公司 High-sulfur non-quenched and tempered steel for automobile camshaft and production process thereof
CN111876689B (en) * 2020-09-08 2022-05-13 鞍钢股份有限公司 Low-carbon selenium-containing free-cutting steel for instruments and manufacturing method thereof
CN111876689A (en) * 2020-09-08 2020-11-03 鞍钢股份有限公司 Low-carbon selenium-containing free-cutting steel for instruments and manufacturing method thereof
CN112195305A (en) * 2020-09-17 2021-01-08 南京钢铁股份有限公司 Method for refining grain size of sulfur-containing non-quenched and tempered steel
CN113957338A (en) * 2021-10-09 2022-01-21 南京钢铁股份有限公司 Magnesium-containing 45 steel and preparation process thereof
CN115369324A (en) * 2022-09-05 2022-11-22 包头钢铁（集团）有限责任公司 38MnVS5 rare earth free-cutting hot-rolled round steel for automobiles and preparation method thereof
CN115369324B (en) * 2022-09-05 2023-12-08 包头钢铁（集团）有限责任公司 38MnVS5 rare earth free cutting hot rolled round steel for automobile and preparation method thereof

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