CN105803308B - A kind of the 45MnVS easy-cutting untempered steels and its manufacturing method of the calcium containing magnesium - Google Patents

A kind of the 45MnVS easy-cutting untempered steels and its manufacturing method of the calcium containing magnesium Download PDF

Info

Publication number
CN105803308B
CN105803308B CN201610163261.4A CN201610163261A CN105803308B CN 105803308 B CN105803308 B CN 105803308B CN 201610163261 A CN201610163261 A CN 201610163261A CN 105803308 B CN105803308 B CN 105803308B
Authority
CN
China
Prior art keywords
steel
controlled
added
45mnvs
cutting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201610163261.4A
Other languages
Chinese (zh)
Other versions
CN105803308A (en
Inventor
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
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
University of Shanghai for Science and Technology
Original Assignee
University of Shanghai for Science and Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by University of Shanghai for Science and Technology filed Critical University of Shanghai for Science and Technology
Priority to CN201610163261.4A priority Critical patent/CN105803308B/en
Publication of CN105803308A publication Critical patent/CN105803308A/en
Application granted granted Critical
Publication of CN105803308B publication Critical patent/CN105803308B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

The present invention provides a kind of the 45MnVS easy-cutting untempered steels and its manufacturing method of the calcium containing magnesium, the main component of the steel：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 present invention is smelted by converter control, LF+VD magnesium calcium combined processings modify inclusion morphology, M EMS+F EMS combined continuous castings, controlled rolling and controlled cooling, micro addition magnesium calcium modifies sulfur-bearing field trash on the basis of traditional 45MnVS, keep strength of materials index suitable with No. 45 steel quenched and tempered states, is provided simultaneously with machinability more superior than 45MnVS, anti-fatigue performance.It can be used for parts and the structural members such as automobile connecting bar, bent axle, knuckle spindle, drive shaft, preceding bridge.

Description

A kind of the 45MnVS easy-cutting untempered steels and its manufacturing method of the calcium containing magnesium
Technical field
The present invention relates to field of steel metallurgy, specifically a kind of non-hardened and tempered steel and its production technology are related to a kind of containing Mg- The easy-cutting untempered steel of Ca and and its manufacturing method.
Background technology
Easy-cutting untempered steel is cancelled by the methods of the Strengthening and Toughenings such as microalloying, controlled rolling and controlled cooling, S, Pb machining Tempering and Quenching, reaches or a kind of high-quality or very special quality structure close to quenched steel mechanical property and with free-cutting machinability Steel.Easy-cutting untempered steel is widely used in parts and the structures such as automobile connecting bar, bent axle, knuckle spindle, drive shaft, preceding bridge Part, and dosage increasingly increases, and is the Typical Representative of automobile steel, has catered to mechanical processing constantly to automation, high speed and essence Densification direction develop to easy-cutting untempered steel propose improve processing performance and higher intensity requirement, with refinery practice, The use scope of the development of microalloying control technology, Controlled Rolling And Controlled Cooling, easy-cutting untempered steel is more extensive, is related to building It builds, the fields such as heavy-duty machinery, high-pressure delivery pipeline, bridge, achieves significant energy saving effect.
Non-hardened and tempered steel is to lead to energy shortage in the world and fast development along with the oil crisis in 70 years 20th century A kind of energy-efficient steel, due to its have many advantages, such as save the energy, material, reduce quenching distortion cracking, it is simple for process, at present It is paid close attention to by countries in the world.Currently, many forging widely used non-hardened and tempered steel manufacture on Foreign Automobile；Internal vapor depot also exists Development and application non-hardened and tempered steel or Introduced From Abroad non-hardened and tempered steel manufacturing technology.It compares with quenched and tempered steel, tradition is hot-forged non-tune The intensity of matter steel is preferable, but toughness is insufficient and not Cutting free, limits its extensive use, therefore, easy-cutting untempered steel Development priority is to improve toughness on the basis of proof strength and assign its excellent free-cutting machinability.
Production technology difficult point is that oxygen content in steel, the absorptivity of element sulphur and close limit, field trash are tiny, uniform harmless Change processing 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 and, ingredient and temperature unevenness poor with the degree of purity of the sulphur free-cutting steel of Al deoxidization techniques production, nitrogen hydrogen content height And easily to block mouth of a river castability poor for the cotton-shaped oxide of Al.In order to overcome these difficult disadvantages, the present invention propose using converter → LF → VD → continuous casting → controlled rolling and controlled cooling simultaneously produces sulfur-bearing easy-cutting untempered steel with the compound modifying process of Ca-Mg, is ensureing machinery Under the premise of performance, and then improve the machinability of steel, while steel degree of purity, uniformity can be significantly improved, raising can pour Property.
The Chinese patent of Publication No. CN1667129A discloses a kind of production method of sulfur-bearing easy-cutting untempered steel, steel Component (weight percent) 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 present patent application place different from above-mentioned patent is：The present patent application is free of Ti and pass through magnesium calcium modify inclusion morphology.
The Chinese patent of Publication No. CN101255535 discloses a kind of compound easy-cutting untempered steel of Ca-S and its life 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 present patent application place 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 processing is used in skill.
A kind of non-hardened and tempered steels of Publication No. CN104264040A and its manufacturing method and using the non-hardened and tempered steel manufacture Bent axle, chemical elements in percentage by mass are: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 iron and other are inevitably miscellaneous Matter.The present patent application place different from above-mentioned patent is：The present patent application is not added Nb and magnesium calcium is used to modify, Mg： 0.0005%~0.008%, Ca:0.0008%~0.005%, and the application uses VD processing in technique.
Invention content
The present invention is directed to the insufficient and manufacturing industry of prior art to material increasingly higher demands, changes by the way that Mg-Ca is compound A kind of sulfur-bearing of matter processing offer, magnesium easy-cutting untempered steel and its production method, and then modify in sulfur-bearing easy-cutting untempered steel Sulphide inculsion, so as to improve inclusion morphology, and then the mechanical performance and cutting ability of steel.The ingredient of the 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.
The purpose of the present invention is achieved through the following technical solutions:
A kind of sulfur-bearing, magnesium, the easy-cutting untempered steel of calcium and its smelting process, the ingredient of the non-hardened and tempered steel is with weight percent Than being calculated as：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：
C：The height of carbon content has critically important influence to the strong hardness and plasticity and toughness of steel.In all elements, carbon The ability for improving intensity is maximum, carbon to 5 times that the reinforcings effect of quenched and tempered steel is about silicon, 9 times of chromium with 18 times of manganese, institute Think and ensure that pinion steel has enough intensity, hardness, must contain comparable carbon content in steel.Contain the general gear steel capital More alloying element, many of which carbide former can form MoC, (Fe, Cr) with carbon3C、Cr7C3Equal carbide. Alloy carbide is precipitated in drawing process and generates post-curing effect, and the hardness of material can be made to further increase, to have There are higher intensity and good wear-resisting property.
Si：If silicon can control the deoxidation degree of pinion steel as deoxidier, be influence steel in sulphide inculsion deformation and The key element of cutting ability, while being also one of the element for deteriorating cutting rolled steel performance.Silicon can improve the through hardening of infiltration layer strongly Property, but be easy to happen grain boundary oxidation in carburizing process and form the netted defect of black;With the increase of alloying element additive amount, steel Martensite point decline, make to contain abundant residues austenite after quenching in infiltration layer, influence the fatigue behaviour and wearability of part.
Mn：Manganese can improve the nucleating work and transformation activation energy of pearlite, reduce the nucleation rate and coarsening rate of pearlite, manganese Element and its carbide are dissolved in austenite, and austenite isothermal transformation diagram is made to move to right, and increase overcooling austenite stability, are inhibited Perlitic transformation improves quenching degree, and the MnS that manganese is generated with the sulphur in steel is a kind of important free-cutting phase, can be helped improve Cutting ability.In order to ensure that good cutting ability and mechanical property, the present invention control the content of manganese 0.8 ~ 1.6%.
P：It is considered as a kind of harmful element for structural steel phosphorus, but in flat cold-rolled sheet, ferrite can be dissolved in using it And intensity is significantly improved, while to avoid the cold brittleness of phosphorus, phosphorus content general control is below 0.10%.
S：S≤0.025% of general low-sulfur steel, middle sulphur steel S=0.04~0.09%, high-sulfur steel S=0.10~0.30%.Wherein Middle sulphur steel due to good cutting ability and mechanical property, being widely used in industrial production, and high-sulfur steel be then for Meet the steel of special cutting ability demand.For ordinary steel, the micro sulphur that increases can play the apparent effect for improving machinability Fruit.Research shows that field trash glomeration or fusiform are more advantageous to cutting than linear.Can by into automatic steel be added calcium, The member such as rare earth and titanium usually achievees the purpose that change sulphide shape.Should ensure that simultaneously has certain manganese sulphur ratio in steel, reduce The adverse effect brought in steel because sulfur content is excessively high, to protect the mechanical property of sign 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 is easily stretched along rolling direction in hot rolling simultaneously It is long, reduce the horizontal mechanical performance of steel.Therefore present invention control sulfur content is 0.040% ~ 0.08%.
V：Vanadium is the most frequently used and effectively strengthens micro alloying element, mainly by forming V（C, N）To influence steel Tissue and performance.V（C, N）Mainly Precipitation, fining ferrite grains increase steel in the ferrite of austenite grain boundary Intensity.After a small amount of vanadium is added in steel, vanadium is combined to form V with carbon and " freedom " nitrogen（C, N）Compound, reduce in steel " from By " nitrogen content, so that steel is had unstrained timeliness.The carboritride of vanadium has the function of that crystal grain thinning increases intensity, by force Degree linearly increases with the increase of content of vanadium, unfavorable if to its toughness if content of vanadium is more than 0.15%.The addition of vanadium in steel General control is measured 0.08%~0.13%.
Al:Aluminium be usually be added in metal as deoxidier, but be also a kind of micro alloying element for in steel Nitrogen combines.In cooling procedure with the decline of temperature, solubility of the aluminium in austenite reduces and is precipitated the nitride of aluminium, plays resistance Only Austenite Grain Growth acts on.Promote heterogeneous nucleation in γ → α phase transformations and accelerates austenite transformation and fining ferrite Crystal grain.In order to which preferably crystal grain thinning rationally controls wire-feeding velocity and line feeding opportunity using refining hello Al line modes so that acid Molten aluminium content can stability contorting within the scope of internal control.
Ca：During solidification of molten steel, the oxidation product of calcium can promote the analysis of sulfide as sulfide forming core core Go out and is uniformly distributed with sulfide.By the way that oxide morphology control element is added into steel, such as tellurium, selenium, titanium, calcium or rare earth metal Deng and control oxygen content in steel, by steel inclusion formed fusiform to improve the machinability of steel.Generally use calcium metal or calcium Silicon alloy deoxidier carrys out deoxidation instead of metallic aluminium.General simple calcium and easy-cutting steel is rarely employed, and calcium-sulphur or calcium-sulphur-lead are compound Automatic steel is more universal.
Mg：Magnesium is the metallic element more more active than AI, and will not be formed and be mingled with as magnesia is cotton-shaped and block the mouth of a river.In steel In liquid process of setting, forming core core of the oxidation product as sulfide can promote the precipitation of sulfide and be uniformly distributed.Magnesium Change oxide morphology can also be played, it is that the spindle that core manganese sulfide is coating is mingled with to form magnesia, easy to improve 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 relationship of Mg, Ca, O, S, when can obtain 1873K balances, [Mg] in steel, [Ca], [O], [S] it is dense Degree relationship.
A kind of production technology of calcic sulphur magnesium easy-cutting untempered steel, it is characterised in that:The technique include smelt, continuous casting and Rolling process, technological process are:
(1) smelting and alloying：For converter molten iron without desulfurization, only decarburization and phosphorus, when tapping 1/4, presses silicomanganese-ferrosilicon- Iron sulfide sequence, which is added, carries out weak deoxidation, and Control for Oxygen Content is in 30-100ppm；
(2) LF stoves refine：Refining slag, submerged arc slag is added, iron sulfide is added and controls sulfur content, white slag processing is carried out, after LF Silicon magnesium calcium alloy line was added into steel and carries out Mg-Ca combined processings and field trash modification phase, and wire-feeding velocity is controlled in 95-120m/ Min simultaneously controls suitable Ca/S, Mg/S, and Ca/S controls are controlled in 0.010-0.050, Mg/S in 0.010-0.050, it is ensured that are changed It studies and point meets design requirement；
(3) vacuum refining：To ensure Cutting free inclusion morphology in steel, vacuum outgas is carried out, and then realize element sulphur Stability contorting and sulphide inculsion spindle rate is improved, S lines are added after vacuum breaker into steel, keep S contents up to standard；
(4) it pours into a mould：Whole process carries out molding casting, and the control degree of superheat is 25-40 DEG C, and continuous casting casting speed is 0.7-1.20 M/min, weak cold cooling ensure that continuous casting billet quality, M-EMS running current are 250-280A, frequency 2.5- 3.5HZ, best end electromagnetic agitation running current are 150-180A, frequency 10.0-13HZ；
(5) controlled rolling and controlled cooling：Steel billet is 1050-1200 DEG C in the soaking temperature of heating furnace, 1100-1150 DEG C of start rolling temperature, 900-1000 DEG C of finishing temperature；It is 2 DEG C/s to roll rear steel cooling velocity.
A kind of technological process of production of the 45MnVS easy-cutting untempered steels of the calcium containing magnesium is:
Converter smelting → LF refining → VD → continuous casting → strand hole cold → inspection → blank examination → heating → de-scaling → is rolled System → shearing or sawing → hole it is cold → aligning → reconditioning → product inspection → packing indicates → weighs.
Production technology difficult point is that oxygen content in steel, the absorptivity of element sulphur and close limit, field trash are tiny, uniform harmless Change processing 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 and, ingredient and temperature unevenness poor with the degree of purity of the sulphur free-cutting steel of Al deoxidization techniques production, nitrogen hydrogen content height And easily to block mouth of a river castability poor for the cotton-shaped oxide of Al.In order to overcome these difficult disadvantages, the present invention propose using converter → LF → VD → continuous casting → controlled rolling and controlled cooling simultaneously produces sulfur-bearing easy-cutting untempered steel with the compound modifying process of Mg-Ca, is ensureing machinery Under the premise of performance, and then improve the machinability of steel, while steel degree of purity, uniformity can be significantly improved, raising can pour Property.
Specific implementation mode
Embodiment 1:
A kind of production technology of the 45MnVS easy-cutting untempered steels of the calcium containing magnesium：
It is further preferred that the preparation method of the compound easy-cutting untempered steels of Mg- Ca, in the chemical composition symbol for ensureing steel It closes in the case of requiring, carries out following steps：
(1) smelting and alloying：For converter molten iron without desulfurization, only decarburization and phosphorus, when tapping 1/4, presses silicomanganese-ferrosilicon- Iron sulfide sequence, which is added, carries out weak deoxidation, and Control for Oxygen Content is in 45ppm；
(2) LF stoves refine：Refining slag, submerged arc slag is added, iron sulfide is added and controls sulfur content, carries out white slag processing, Silicon magnesium calcium alloy line was added into steel and carries out Mg-Ca combined processings and field trash modification the LF later stages, and wire-feeding velocity is controlled in 100m/ Min simultaneously controls suitable Ca/S, Mg/S, and Ca/S controls are controlled in 0.040, Mg/S 0.035, it is ensured that chemical composition, which meets, to be set Meter requires；
(3) vacuum refining：To ensure Cutting free inclusion morphology in steel, vacuum outgas is carried out, and then realize element sulphur Stability contorting and sulphide inculsion spindle rate is improved, S lines are added after vacuum breaker into steel, keep S contents up to standard；
(4) it pours into a mould：Whole process carries out molding casting, and the control degree of superheat is 30 DEG C, and continuous casting casting speed is 1 m/min, weak cold Cooling to ensure that continuous casting billet quality, Water Rate for Secondary Cooling Water are 0.3L/Kg or so, M-EMS running current is 260A, frequency For 3.0HZ, best end electromagnetic agitation running current is 170A, frequency 12HZ；
(5) controlled rolling and controlled cooling：Steel billet is 1200 DEG C in the soaking temperature of heating furnace, 2.5 hours heating times, start rolling temperature 1130 DEG C, 950 DEG C of finishing temperature.It is 2 DEG C/s, lower cold 700 DEG C of the temperature of cold bed heap to roll rear steel cooling velocity.

Claims (2)

1. a kind of 45MnVS easy-cutting untempered steels of calcium containing magnesium, it is characterised in that the 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；The manufacture of the 45MnVS easy-cutting untempered steels of the calcium containing magnesium Method, production technology are as follows：
(1) smelting and alloying：For converter molten iron without desulfurization, only decarburization and phosphorus, when tapping 1/4, presses silicomanganese-ferrosilicon-vulcanization Iron sequence, which is added, carries out weak deoxidation, and Control for Oxygen Content is in 30-100ppm；
(2) LF stoves refine：Be added refining slag, submerged arc slag, be added iron sulfide control sulfur content, carry out white slag processing, the LF later stages to Silicon magnesium calcium alloy line be added in steel carry out Mg-Ca combined processings and field trash and modify, wire-feeding velocity control 95-120m/min simultaneously Suitable Ca/S, Mg/S are controlled, Ca/S controls are controlled in 0.010-0.050, Mg/S in 0.010-0.050, it is ensured that chemical composition Meet design requirement；
(3) vacuum refining：To ensure Cutting free inclusion morphology in steel, vacuum outgas is carried out, and then realize the stabilization of element sulphur Sulphide inculsion spindle rate is controlled and improved, S lines is fed into steel after vacuum breaker, keeps S contents up to standard；
(4) it pours into a mould：Whole process carries out molding casting, and the control degree of superheat is 25-40 DEG C, and continuous casting casting speed is 0.7-1.20m/min, Weak cold cooling ensures continuous casting billet quality, and M-EMS running current is 250-280A, frequency 2.5-3.5HZ, most preferably End electromagnetic agitation running current is 150-180A, frequency 10.0-13HZ；
(5) controlled rolling and controlled cooling：Steel billet is 1050-1200 DEG C in the soaking temperature of heating furnace, 1100-1150 DEG C of start rolling temperature, finish to gauge 900-1000 DEG C of temperature；It is 2 DEG C/s to roll rear steel cooling velocity.
2. a kind of manufacturing method of the 45MnVS easy-cutting untempered steels of calcium containing magnesium as described in claim 1, it is characterised in that tool The production technology of body is as follows：
(1) smelting and alloying：For converter molten iron without desulfurization, only decarburization and phosphorus, when tapping 1/4, presses silicomanganese-ferrosilicon-vulcanization Iron sequence, which is added, carries out weak deoxidation, and Control for Oxygen Content is in 30-100ppm；
(2) LF stoves refine：Be added refining slag, submerged arc slag, be added iron sulfide control sulfur content, carry out white slag processing, the LF later stages to Silicon magnesium calcium alloy line be added in steel carry out Mg-Ca combined processings and field trash and modify, wire-feeding velocity control 95-120m/min simultaneously Suitable Ca/S, Mg/S are controlled, Ca/S controls are controlled in 0.010-0.050, Mg/S in 0.010-0.050, it is ensured that chemical composition Meet design requirement；
(3) vacuum refining：To ensure Cutting free inclusion morphology in steel, vacuum outgas is carried out, and then realize the stabilization of element sulphur Sulphide inculsion spindle rate is controlled and improved, S lines is fed into steel after vacuum breaker, keeps S contents up to standard；
(4) it pours into a mould：Whole process carries out molding casting, and the control degree of superheat is 25-40 DEG C, and continuous casting casting speed is 0.7-1.20m/min, Weak cold cooling ensures continuous casting billet quality, and M-EMS running current is 250-280A, frequency 2.5-3.5HZ, most preferably End electromagnetic agitation running current is 150-180A, frequency 10.0-13HZ；
(5) controlled rolling and controlled cooling：Steel billet is 1050-1200 DEG C in the soaking temperature of heating furnace, 1100-1150 DEG C of start rolling temperature, finish to gauge 900-1000 DEG C of temperature；It is 2 DEG C/s to roll rear steel cooling velocity.
CN201610163261.4A 2016-03-19 2016-03-19 A kind of the 45MnVS easy-cutting untempered steels and its manufacturing method of the calcium containing magnesium Active CN105803308B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610163261.4A CN105803308B (en) 2016-03-19 2016-03-19 A kind of the 45MnVS easy-cutting untempered steels and its manufacturing method of the calcium containing magnesium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610163261.4A CN105803308B (en) 2016-03-19 2016-03-19 A kind of the 45MnVS easy-cutting untempered steels and its manufacturing method of the calcium containing magnesium

Publications (2)

Publication Number Publication Date
CN105803308A CN105803308A (en) 2016-07-27
CN105803308B true CN105803308B (en) 2018-07-13

Family

ID=56453537

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201610163261.4A Active CN105803308B (en) 2016-03-19 2016-03-19 A kind of the 45MnVS easy-cutting untempered steels and its manufacturing method of the calcium containing magnesium

Country Status (1)

Country Link
CN (1) CN105803308B (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
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
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
CN109234626B (en) * 2018-07-18 2020-11-24 石家庄钢铁有限责任公司 Free-cutting steel for heavy-duty automobile hub bearing and manufacturing method thereof
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
CN109988883B (en) * 2019-04-09 2021-05-07 上海大学 Magnesium-calcium adding process method of magnesium-calcium containing non-quenched and tempered steel
CN112575242B (en) * 2019-09-27 2022-06-24 宝山钢铁股份有限公司 Steel for alloy structure and manufacturing method thereof
CN111318659B (en) * 2020-02-29 2021-12-07 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
CN111286678B (en) * 2020-04-08 2021-07-27 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
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
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

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998013529A1 (en) * 1996-09-27 1998-04-02 Kawasaki Steel Corporation High strength and high tenacity non-heat-treated steel having excellent machinability
US5922145A (en) * 1996-11-25 1999-07-13 Sumitomo Metal Industries, Ltd. Steel products excellent in machinability and machined steel parts
JP4038457B2 (en) * 2003-08-27 2008-01-23 住友金属工業株式会社 Hot forged non-tempered steel for induction hardening
CN1667129A (en) * 2004-03-10 2005-09-14 首钢总公司 Method for producing sulfur free cutting and non-hardened and tempered steel
KR101177542B1 (en) * 2008-02-26 2012-08-28 신닛뽄세이테쯔 카부시키카이샤 Non-heat treated steel for hot forging and steel for hot rolling excellent in fracture splittability and machinability, and hot forging non-heat treated steel part
CN100537817C (en) * 2008-03-17 2009-09-09 莱芜钢铁股份有限公司 Easy-cutting untempered steel and manufacture method thereof

Also Published As

Publication number Publication date
CN105803308A (en) 2016-07-27

Similar Documents

Publication Publication Date Title
CN105803308B (en) A kind of the 45MnVS easy-cutting untempered steels and its manufacturing method of the calcium containing magnesium
CN109252097B (en) Non-quenched and tempered steel of high-strength expansion-fracture connecting rod and continuous casting production process thereof
CN107604250B (en) A kind of heavy truck transmission gear 21MnCrMoS steel and its manufacturing method
CN105970095B (en) A kind of high intensity, high-wearing feature, the crawler belt steel of high fatigue life and its production technology
CN108611562B (en) Sulfur-aluminum-containing killed non-quenched and tempered steel and sulfide morphology control method thereof
CN103510020B (en) Spring steel wire rod and inclusion control method thereof
CN107904492A (en) A kind of low silicon high-carbon-chromium bearing steel and its hot rolling production method
CN103498107A (en) High-boron high-chromium low-carbon high-temperature-resistant wear-resisting alloy steel and manufacturing method thereof
CN102703817A (en) Free-machining pinion steel and production technique thereof
CN103572166A (en) Boracic high-speed steel with good red hardness and preparation method thereof
CN111286670A (en) Medium-carbon non-quenched and tempered steel and preparation process thereof, and connecting rod and preparation process thereof
CN108531804A (en) A kind of sulfur-bearing al-killed pinion steel and its Morphology of Sulfide control method
CN109735765B (en) Large-sized, ultra-fine grain, high-strength and high-toughness spring steel and production method thereof
CN103498108A (en) High-boron high-chromium low-carbon wear-resisting alloy steel with good red hardness and manufacturing method thereof
CN113832321B (en) Aluminum-treated high-corrosion-resistance steel bar for 500 MPa-grade ocean island concrete engineering and production method thereof
CN113073251A (en) Manufacturing method of 590 MPa-grade hot-rolled complex phase steel for thick-specification high-fatigue-performance automobile spoke
CN112143970B (en) High-strength high-toughness non-quenched and tempered front axle steel and production method thereof
CN111763883A (en) Steel for hollow stabilizer bar and production method thereof
CN106811684A (en) Yield strength 750Mpa grades of container hot rolled steel plate and its manufacture method
CN109023055A (en) A kind of high intensity high formability autobody sheet and its production technology
CN109930063A (en) A kind of engineering machinery crawler body wheel body steel and its production method
CN111893382B (en) Food chain stainless steel and preparation method thereof
CN109097681A (en) A kind of high intensity is low to be mingled with autobody sheet and its continuous casting process electromagnetic agitation technique
CN112981228A (en) Steel bar with good cold forging performance for transmission gear shaft and manufacturing method
CN110964984B (en) Steel SAE4160M for middle and large automobile shaft sleeve and production process thereof

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant