CN106939391A - A kind of Ca microalloyings easy-cutting high strength fractured connecting rod steel and manufacture method - Google Patents

A kind of Ca microalloyings easy-cutting high strength fractured connecting rod steel and manufacture method Download PDF

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Publication number
CN106939391A
CN106939391A CN201710213598.6A CN201710213598A CN106939391A CN 106939391 A CN106939391 A CN 106939391A CN 201710213598 A CN201710213598 A CN 201710213598A CN 106939391 A CN106939391 A CN 106939391A
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steel
cutting
rolling
rod
easy
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Inventor
顾铁
邵淑艳
陈斌
杨高成
周群
孟文斌
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Jiangyin Xingcheng Special Steel Works Co Ltd
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Jiangyin Xingcheng Special Steel Works Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/005Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/001Ferrous alloys, e.g. steel alloys containing N
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/002Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/06Ferrous alloys, e.g. steel alloys containing aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/60Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/005Ferrite
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/009Pearlite

Abstract

The present invention relates to a kind of Ca microalloyings easy-cutting high strength fractured connecting rod steel, the chemical composition of the steel is C by mass percentage:0.25~0.60%, Si:0.10~1.20%, Mn:0.40~1.50%, Cr:0.05~0.50%, S:0.02~0.15%, P:0.02~0.15%, V:0.03~0.55%, Ca:0.0005~0.0080%, N:0.002~0.035%, Al:0.002~0.080%, Ti:≤ 0.02%, surplus is Fe and inevitable impurity element.The steel are through smelting, continuous casting, heating, hot rolling, cooling, and tissue signature is uniform ferrite+pearlite.Steel are by optimizing key element in steel, especially use Ca microalloyings, obtain it is a kind of possess high intensity, good machinability, the fractured connecting rod steel of good swollen disconnected property high comprehensive performance, meet the design requirement of engine lightweight, economy and driver comfort.

Description

A kind of Ca microalloyings easy-cutting high strength fractured connecting rod steel and manufacture method
Technical field
The present invention relates to a kind of Ca microalloyings Steel material and its manufacture method, more particularly to a kind of easy-cutting high strength are swollen Cracking connecting rod steel and its manufacture method.
Background technology
With the fast development of transportation.The vehicle engines such as automobile, steamer are using high intensity, Cutting free is swollen The ratio of cracking connecting rod steel is improved constantly.Pressure on Energy requires that engine link has higher intensity to realize lightweight and good Cutting ability.The comfortableness of driving requires that engine link has a good assembling again, and fractured connecting rod have compared to Cutting off connecting rod has more excellent assembly performance.To meet above-mentioned requirements, a kind of Ca microalloyings easy-cutting high strength is invented swollen disconnected Connecting rod has wide market prospects.
Carbon Micro Alloying fractured connecting rod steel and its manufacturer in a kind of Cutting free disclosed in application number 201510612936.4 Method, is carbon Micro Alloying fractured connecting rod steel in a kind of Cutting free, and its feature is that its microstructure includes ferrite+pearlite, And second phase particles VN;The steel grade C:0.2~0.55%, Si:0.35~1.00%, Mn:0.5~1.70%, S:0.01~ 0.09%, P:0.03~0.15%, Cr:0.05~0.50%, V:0.05~0.45%, N:0.005~0.030% remaining be Fe and its His inevitable impurity.The steel grade is a kind of middle carbon non-hardened and tempered steel containing vanadium, and for making fractured connecting rod, the steel grade with the addition of member The elements such as plain S, P, making to generate in steel improves the cutting ability of material being mingled with for compound type;Material plasticity deformation is reduced simultaneously Performance, is easy to the swollen disconnected processing of connecting rod, intensity and the fatigue life of material is not appreciably affected again.But, field trash type, size, Pattern control is bad so that material cannot get preferable combination property.
36MnVS4 fractured connecting rods steel making method disclosed in application number 201610396333.X, the steel grade passes through control P content processed improves swollen disconnected performance 0.020~0.030%, while controlling residual elements Cr in 0.10~0.15%, carbon equivalent control 1.18~1.27%, material property has been improved, but the steel grade alloying element is relatively low, mechanical property is relatively low, to meet zero The performance requirement of part design need to use the bigger material of specification, be unfavorable for engine lightweight requirements.
Cracking connecting-rod steel disclosed in application number 200880118575.6, the steel grade C:0.25~0.5%, Si:0.01~ 2.0%, Mn:0.5~2.0%, S:0.01~0.2%, P:0.015~0.080%, V:0.02~2.0%, Cr:0.05~1.0%, Ti:0.01~0.10%, N:Less than 0.01%, remaining is Fe and other inevitable impurity.The machinability of the steel grade has changed It is kind, but still be difficult to resolve the difficulty that certainly machinability and cracking performance are existed side by side, and suitably reduce alloy to improve the machinability steel grade Addition, result in the decline of the strength of materials.And this steel grade adds the Ti elements of high level so that generated in steel larger amount of Harmful field trash containing Ti so that the fatigue behaviour of material is significantly reduced.
To sum up, in order to adapt to the production needs of economic and environment-friendly and driver comfort engine link, one can be produced Kind of Cutting free, high intensity, easily swollen disconnected, it is that those skilled in the art are urgent that composition is simple, technique is simple, produce efficient connecting rod with steel Cut the technical issues that need to address.
The content of the invention
Present invention aims at providing a kind of Ca microalloyings easy-cutting high strength fractured connecting rod steel, the steel have compared with High yield strength, tensile strength and higher fatigue behaviour.In addition, the swollen disconnection of carbon Micro Alloying in Cutting free of the present invention Bar is good with steel machinability, and with the good swollen disconnected performance of fragility.
Another object of the present invention is to provide a kind of manufacture method of Ca microalloyings easy-cutting high strength fractured connecting rod steel.
The technical scheme that present invention solution above-mentioned technical problem is used is a kind of Ca microalloyings easy-cutting high strength is swollen Cracking connecting rod steel, the chemical composition of the steel is C by mass percentage:0.25~0.60%, Si:0.10~1.20%, Mn: 0.40~1.50%, Cr:0.05~0.50%, S:0.02~0.15%, P:0.02~0.15%, V:0.03~0.55%, Ca: 0.0005~0.0080%, N:0.002~0.035%, Al:0.002~0.080%, Ti:≤ 0.02%, surplus is Fe and can not The impurity element avoided, S/Ca:≥15.
Steel mechanics performance of the present invention is met:Yield strength is 550~650 MPa, and tensile strength is 800~950MPa, Elongation percentage≤20%, normal temperature ballistic work AKv≤23J.
Ca microalloyings easy-cutting high strength fractured connecting rod steel of the present invention, comprehensively improves the intensity of material, cuts Cut processability, swollen disconnected three characteristics of property.It need to consider to reduce alloying element generally for the machinability for improving material, suitably reduce material Expect hardness, but reduce alloying component, and steel plasticity will be improved, be unfavorable for the swollen disconnected of connecting rod, both are in shifting pass System, it is difficult to exist side by side.The present invention seeks to the machining of material is synthesized and coordinated in the case where ensuring that the strength of materials meets requirement Property and swollen disconnected property.Research is found, by adding Ca elements and controlling its microalloying, is formed specific field trash, can be improved The machinability of material, and the swollen disconnected property of material is not reduced.
The each element design principle of steel of the present invention is as follows:
Ca:0.0005~0.0080%.The Ca microalloying easy-cutting high strength fractured connecting rod steel of the present invention, Ca is used as alloy Element is added in steel, it is intended that the machinability and swollen disconnected performance of comprehensive mediation steel, and the strong of steel is not appreciably affected again Degree and fatigue behaviour.The results showed, Ca is added in the steel grade, can comprehensively change the component of field trash, size, shape in steel Looks, are conducive to improving cutting rolled steel performance.Meanwhile, Ca insert can brittle steel grain-boundary strength, splitting for steel is greatly improved Solve performance.It is set as 0.0005~0.0080% to give full play to the steel Ca content ranges in the effect above, the present invention.
S/Ca:≥15.Experiment shows, if in steel Ca too high levels, can cause to produce the influence strength of materials in material And the field trash of fatigue behaviour, so offsetting the strength of materials and fatigue behaviour caused by adding Ca by controlling S/Ca >=15 Reduction.Steel S/Ca in the present invention is set as >=15.
S:0.02~0.15%.S is Cutting free element.When containing a certain amount of Mn in steel, MnS is easily formed or containing MnS Complex inclusion so that improve cutting material cutting ability, while when material is swollen disconnected, notch effect is played, so as to improve The swollen disconnected property of material.But the usual fusing point of sulfur-bearing field trash is relatively low, hot-short effect and increase decarburization can occur for S too high levels, material Tendency.It is set as 0.02~0.15% to give full play to the steel S content ranges in the effect above, the present invention.
P:0.02~0.15%.P has more serious microsegregation tendency in casting solidification, then in heating in crystalline substance Boundary assembles, and increases steel fragility, particularly cold short performance.General steel need to reduce P content as much as possible, but the present invention's In steel, intentionally add a certain amount of P element to increase steel fragility, and make the ferrite in steel dissolved with the P of certain content, make Obtain ferritic plasticity in material to substantially reduce, so as to improve the swollen disconnected property of material.To give full play in the effect above, the present invention Steel P content range set be 0.02~0.15%.
N:0.002~0.035%.N in steel with the element such as V, Al formation compound, play the work of reinforcing and crystal grain thinning With.It is 0.002~0.035% to give full play to the steel N content range set in the effect above, the present invention.
Al:0.002~0.080%.Al can be prevented effectively as deoxidation effective element by the AlN combined to form with N AUSTENITE GRAIN COARSENING, plays a part of preventing that crystal grain from growing up.But Al content is too high, the Al2O3 spinels that is easily formed, AlN Class belongs to hard crisp field trash, in polygon, spherical characteristic, so as to deteriorate the performance of material, particularly fatigue behaviour.To be abundant It is 0.002~0.080% to play the steel Al content range set in the effect above, the present invention.
Ti:≤0.02%.Though Ti can play a part of crystal grain thinning in steel, the influence strength of materials and fatigue are easily formed Field trash, the present invention in steel Ti content ranges be set as≤0.02%.
The combination properties such as the intensity in order to meet material, steel insert following main alloy element again.
C:0.25~0.60%.C is for ensuring that intensity and for improving the important alloying element needed for swollen disconnected property, special It is a kind of highly effective and economic addition element not in terms of the strength of materials is improved.It is 0.25% by the lower limit set of C content. C content is preferably more than 0.28%, and more preferably more than 0.30%.But C content is too high, the cutting ability of material will be reduced, C is contained The amount upper limit is set as 0.60%, and C content is preferably less than 0.55%, more preferably less than 0.50%.
Si:0.10~1.20%.Si in steel-making as deoxidant element, while Si has stronger solution strengthening to make in steel With, the intensity of steel can be significantly increased, while reduce steel plasticity and toughness.Si can promote element P, S Grain Boundary Segregation, So that crystal boundary is suitably brittle, be conducive to the fragility of steel swollen disconnected.If Si too high levels, the hot formability of bar, shadow can be deteriorated Ring the surface quality that steel are swaged into connecting rod blank.Therefore, the steel Si content ranges in the present invention are set as 0.10~1.20%.
Mn:0.40~1.50%.The element that Mn is acted on as deoxidier, the intensity of steel is improved by solution strengthening, is added Plus a certain amount of Mn is extremely important to the mechanical property for ensuring material.In addition S in steel etc. is combined to form sulfide-based folder by Mn Debris, plays notch effect when swollen disconnected, improves swollen disconnected property.Mn needs to control more than 0.40%;Another aspect Mn is easy Segregation element, can be reduced to the excessively thermo-responsive of steel, Mn too high levels, easy bainite tissue, machinability and swollen disconnected property.It is comprehensive On, the steel Mn content ranges in the present invention are set as 0.40~1.50%.
Cr:0.05~0.50%.Cr elements increase quenching degree, and refine the piece interlamellar spacing of pearlite, are conducive to improving thin The formation ratio and the uniformity of microscopic structure of lamellar pearlite tissue, so as to effectively improve the property such as intensity and fatigue of material Energy.Steel Cr content ranges in the present invention are set as 0.05~0.50%.
V:0.03~0.55%.V can form carbide and nitride in steel, play a part of dispersion-strengtherning in steel, and And V can improve the swollen disconnected performance of material to a certain extent.But V content is excessive, can reduce material cutting ability, while increasing steel Production cost.It is 0.03~0.55% to give full play to the steel V content range set in the effect above, the present invention.
The metallographic structure of gained steel of the invention is ferrite+pearlite.
Another object of the present invention is to provide the manufacture of above-mentioned Ca microalloyings easy-cutting high strength fractured connecting rod steel Method, mainly including following idiographic flow:
Smelting, continuous casting, blank heating, hot rolling(Containing scafing), cooling,
The molten steel for meeting steel chemical composition is smelted, steel-making uses high-performance refined synthetic slag, control each type impurity of steel Quantity and form, are mingled with, particularly external large inclusionses while removing and being harmful to;Ladle keeps prolonged inclusion removal Process, makes non-metallic inclusion fully float, it is ensured that the removal of external large inclusionses;The special refining slag of selection and centre Bag covering slag preferably dross inclusion adsorption;Continuous casting uses rectangular bloom, solves surface quality problems, homogenize problem, field trash number Amount is effectively controlled.Continuous casting uses advanced end electromagnetic agitation, slighter compress Advanced Equipment process, controls the crystal boundary of material inclined Analysis.Meanwhile, in order to ensure Inner Quality of Billet, degree of superheat control is at 10~40 DEG C during cast.
By blank heating in walking beam furnace, preheating section temperature control is in 760~860 DEG C, the first bringing-up section temperature Control is at 960~1060 DEG C, and the second bringing-up section temperature control is at 1050~1200 DEG C, and soaking zone temperature control is 1080~1250 DEG C, be that blank is full and uniform heated, total 2.5 hours heat times and more than.
Monophase field rolling is carried out after high-pressure water descaling:Start rolling temperature is 980~1100 DEG C.Because with the addition of in steel higher The elements such as S, P of content, steel surface crack sensitivity is strong, so first through scafing before open rolling, it is " molten using hyperbaric oxygen air-flow Cut " blank coating metal, " molten to cut " depth is 0.5~4mm, removes the surface defects such as blank surface crackle, pit, decarburization, really Protect stocking surface quality;Then using the rolling of the frame KOCKS three-high mills of 12 frame duo mill+5, the control of single pass maximum reduction Between 25~30mm;Cold using controlling during rolling, control finishing temperature is at 800~900 DEG C;
After rolling terminates, quick cooling is carried out, average cooling rate control is in 40~80 DEG C/min, to mitigate the banded structure of stocking, Final cooling temperature is 300~480 DEG C, and cold material afterwards can freely be cooled to room temperature eventually.
The manufacture method of Ca microalloyings easy-cutting high strength fractured connecting rod steel of the present invention by control smelt, Cast cold, high-temperature heating rolling, high-temperature final rolling and rationally cooling, make steel obtain the metallographic structure of ferrite+pearlite.Press S systems field trash in the steel that above-mentioned manufacturing process is produced, tissue ensures that steel have good machinability, and in grain boundaries The tiny complex inclusion containing Ca of Dispersed precipitate, then be very beneficial for the swollen disconnected of connecting rod.The steel of the application have height simultaneously Intensity, machinability, swollen disconnected three characteristics of property.
Brief description of the drawings:
Fig. 1 is the micro-organization chart of Ca microalloying easy-cutting high strength fractured connecting rod steel in the embodiment of the present invention 1.
Fig. 2 is conducive to improving for Ca microalloying easy-cutting high strength fractured connecting rod steel in the embodiment of the present invention 1 to be cut The S systems field trash picture of property.
Fig. 3 is compound containing Ca in Ca microalloying easy-cutting high strength fractured connecting rod steel crystal boundaries in the embodiment of the present invention 1 Field trash.
Embodiment
Explanation and specific embodiment are swollen to Ca microalloyings easy-cutting high strength of the present invention below in conjunction with the accompanying drawings Cracking connecting rod is made further explanation and description with steel and its manufacture method, but the technology of the explanation and explanation not to the present invention Forecast scheme configuration is improper to be limited.
Embodiment 1-3
By Ca microalloying easy-cutting high strength fractured connecting rod steel in following process manufacture embodiment of the present invention 1-3:
1)Smelt:100 tons of converters carry out external refining after smelting, and molten steel is again through Fruit storage, each chemical element quality Percentage is strictly controlled on request.
2)Continuous casting:200mm × 200mm square billet is casting continuously to form, it is 10~40 DEG C to control the tundish degree of superheat.For control material Segregation, during continuous casting then use advanced end electromagnetic agitation, Continuous Casting Soft Reduction Advanced Equipment and technique.Gained continuous casting billet chemistry Percentage composition see the table below shown in 1:
Table 1.(Wt.%, surplus is Fe and other inevitable impurity elements)
3)Heating:Blank is heated in walking beam furnace, including preheating section, the first bringing-up section, the second bringing-up section, soaking zone, Wherein preheating section temperature control is at 760~860 DEG C, and the first bringing-up section temperature control is in 960~1060 DEG C, the second bringing-up section temperature Control is at 1050~1200 DEG C, and soaking zone temperature control is at 1080~1250 DEG C, total more than 2.5 hours heat time.
4)Hot rolling:Start rolling temperature is 980~1100 DEG C, and finishing temperature is 800~900 DEG C, is rolled in monophase field, single track Secondary maximum reduction control is between 25~30mm.
5)Cooling:Quickly cooled down after hot rolling, average cooling rate control is in 40~80 DEG C/min, and final cooling temperature is 300~480 DEG C, then it is air-cooled to room temperature.
The manufacture method concrete technology of Ca microalloying easy-cutting high strength fractured connecting rod steel in the various embodiments described above Parameter is as shown in table 2 below:
Table 2.(Heating, hot rolling, the specific process parameter of cooling)
Dependence test is carried out with steel to the Ca microalloying easy-cutting high strength fractured connecting rods in embodiment 1-3, the mechanics measured Performance is as shown in table 3 below:
Table 3
As seen from Table 3, the mechanical property in embodiment fully meets design requirement, illustrates that connecting rod has higher intensity.Separately Ca microalloying easy-cutting high strength fractured connecting rod steel elongation percentage≤17% in outer embodiment, normal temperature ballistic work≤25AKv, Illustrate that steel plasticity is low in embodiment, greatly facilitate the swollen disconnected of connecting rod, obtain it is a kind of possess high intensity, good machining Property, the fractured connecting rod steel of good swollen disconnected property high comprehensive performance.
Fig. 1 shows the microstructure of the Ca microalloying easy-cutting high strength fractured connecting rod steel in embodiment 1.From figure 1 understands that the connecting rod is ferrite+pearlite with the microstructure of steel.
It is pointed out that exemplified as above is only specific embodiment of the invention, it is clear that real the invention is not restricted to more than Example is applied, but there are many similar changes as needed.If those skilled in the art is direct from present disclosure All deformations are exported or associated, protection scope of the present invention all should be belonged to.

Claims (4)

1. a kind of Ca microalloyings easy-cutting high strength fractured connecting rod steel, it is characterised in that:The chemical composition of the steel presses matter Amount percentages are C:0.25~0.60%, Si:0.10~1.20%, Mn:0.40~1.50%, Cr:0.05~0.50%, S:0.02 ~0.15%, P:0.02~0.15%, V:0.03~0.55%, Ca:0.0005~0.0080%, N:0.002~0.035%, Al: 0.002~0.080%, Ti:≤ 0.02%, surplus is Fe and inevitable impurity element, S/Ca:≥15.
2. Ca microalloyings easy-cutting high strength fractured connecting rod steel according to claim 1, it is characterised in that:Steel are bent Intensity is taken for 550~650 MPa, tensile strength is 800~950MPa, elongation percentage≤20%, normal temperature ballistic work AKv≤23J.
3. the manufacture method of Ca microalloyings easy-cutting high strength fractured connecting rod as claimed in claim 1 or 2, step is such as Under:(1)Smelt →(2)Continuous casting →(3)Heating →(4)Hot rolling →(5)Cooling,
The molten steel for meeting steel chemical composition is smelted, steel-making uses high-performance refined synthetic slag, control each type impurity of steel Quantity and form, are mingled with, particularly external large inclusionses while removing and being harmful to;Ladle keeps prolonged inclusion removal Process allows non-metallic inclusion fully to float, it is ensured that the removal of external large inclusionses;The special refining slag of selection and centre Bag covering slag preferably dross inclusion adsorption;Continuous casting uses rectangular bloom, solves surface quality problems, homogenize problem, allows field trash Quantity is effectively controlled;
Continuous casting uses advanced end electromagnetic agitation, slighter compress Advanced Equipment process, controls the cyrystal boundary segregation of material, cast overheat Degree control is at 10~40 DEG C;
By blank heating in walking beam furnace, preheating section temperature control is in 760~860 DEG C, the first bringing-up section temperature control At 960~1060 DEG C, the second bringing-up section temperature control at 1050~1200 DEG C, soaking zone temperature control at 1080~1250 DEG C, It is full and uniform heated for blank, total 2.5 hours heat times and more than;
Monophase field rolling is carried out after high-pressure water descaling:Start rolling temperature is 980~1100 DEG C, first through scafing before open rolling, is utilized Hyperbaric oxygen air-flow " molten to cut " blank coating metal, " molten to cut " depth is 0.5~4mm, removes blank surface crackle, pit, decarburization Etc. surface defect, it is ensured that stocking surface quality;Then using the rolling of the frame KOCKS three-high mills of 12 frame duo mill+5, single pass Maximum reduction is controlled between 25~30mm;Cold using controlling during rolling, control finishing temperature is at 800~900 DEG C;
After rolling terminates, quick cooling carries out quick cooling, average cooling rate control is in 40~80 DEG C/min, to mitigate stocking Banded structure, final cooling temperature is 300~480 DEG C, and cold material afterwards can freely be cooled to room temperature eventually.
4. manufacture method as claimed in claim 5, it is characterised in that:The final cooling temperature is 350~480 DEG C.
CN201710213598.6A 2017-04-01 2017-04-01 A kind of Ca microalloyings easy-cutting high strength fractured connecting rod steel and manufacture method Pending CN106939391A (en)

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CN110408858A (en) * 2019-08-22 2019-11-05 中天钢铁集团有限公司 A kind of high-tension insulator steel feet steel alloy and its production technology and purposes
CN111187996A (en) * 2020-01-21 2020-05-22 鞍钢股份有限公司 Medium-carbon sulfur-selenium-containing wire rod for free-cutting steel and manufacturing method thereof
CN111394639A (en) * 2020-03-13 2020-07-10 江阴兴澄特种钢铁有限公司 Manufacturing method of high-wear-resistance gear steel
CN111424219A (en) * 2020-04-01 2020-07-17 江阴兴澄特种钢铁有限公司 Method for manufacturing gear shaft steel capable of being directly subjected to cold forging
CN114075638A (en) * 2020-08-18 2022-02-22 中国石油化工股份有限公司 Steel material, steel for expansion corrugated pipe and preparation method of steel material
CN114134398A (en) * 2021-04-19 2022-03-04 江阴兴澄特种钢铁有限公司 Expansion-fracture connecting rod steel with yield ratio of 0.70-0.80 and manufacturing method thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5763668A (en) * 1980-10-04 1982-04-17 Daido Steel Co Ltd Free cutting austenite stainless steel
JP2000336460A (en) * 1999-05-27 2000-12-05 Nippon Steel Corp Hot rolled wire rod and steel bar for machine structure and manufacture of the same
CN101405418A (en) * 2006-03-15 2009-04-08 株式会社神户制钢所 Rolled material for fracture split connecting rod excelling in fracture splittability, hot forged part for fracture split connecting rod excelling in fracture splittability, and fracture split connect
CN105121685A (en) * 2013-04-10 2015-12-02 新日铁住金株式会社 Case-hardening steel material and case-hardening steel member
CN105154774A (en) * 2015-09-23 2015-12-16 宝山钢铁股份有限公司 Free-cutting medium-carbon non-quenching and tempering steel for fracture splitting connecting rod and manufacturing method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5763668A (en) * 1980-10-04 1982-04-17 Daido Steel Co Ltd Free cutting austenite stainless steel
JP2000336460A (en) * 1999-05-27 2000-12-05 Nippon Steel Corp Hot rolled wire rod and steel bar for machine structure and manufacture of the same
CN101405418A (en) * 2006-03-15 2009-04-08 株式会社神户制钢所 Rolled material for fracture split connecting rod excelling in fracture splittability, hot forged part for fracture split connecting rod excelling in fracture splittability, and fracture split connect
CN105121685A (en) * 2013-04-10 2015-12-02 新日铁住金株式会社 Case-hardening steel material and case-hardening steel member
CN105154774A (en) * 2015-09-23 2015-12-16 宝山钢铁股份有限公司 Free-cutting medium-carbon non-quenching and tempering steel for fracture splitting connecting rod and manufacturing method thereof

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110184533A (en) * 2018-07-27 2019-08-30 江阴兴澄特种钢铁有限公司 A kind of low silicon universal-joint Rzeppa steel and manufacturing method
CN109778073A (en) * 2019-02-20 2019-05-21 宝钢特钢长材有限公司 A kind of Cutting free automobile synchronizer steel and preparation method thereof
CN109852890A (en) * 2019-04-09 2019-06-07 鞍钢股份有限公司 A method of improving oil transportation pipeline L450M steel plate low-temperature flexibility
CN110408858A (en) * 2019-08-22 2019-11-05 中天钢铁集团有限公司 A kind of high-tension insulator steel feet steel alloy and its production technology and purposes
CN110408858B (en) * 2019-08-22 2020-09-08 中天钢铁集团有限公司 Alloy steel for high-voltage insulator steel foot and production process and application thereof
CN111187996A (en) * 2020-01-21 2020-05-22 鞍钢股份有限公司 Medium-carbon sulfur-selenium-containing wire rod for free-cutting steel and manufacturing method thereof
CN111394639A (en) * 2020-03-13 2020-07-10 江阴兴澄特种钢铁有限公司 Manufacturing method of high-wear-resistance gear steel
CN111424219A (en) * 2020-04-01 2020-07-17 江阴兴澄特种钢铁有限公司 Method for manufacturing gear shaft steel capable of being directly subjected to cold forging
CN114075638A (en) * 2020-08-18 2022-02-22 中国石油化工股份有限公司 Steel material, steel for expansion corrugated pipe and preparation method of steel material
CN114134398A (en) * 2021-04-19 2022-03-04 江阴兴澄特种钢铁有限公司 Expansion-fracture connecting rod steel with yield ratio of 0.70-0.80 and manufacturing method thereof

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Application publication date: 20170711