CN109666856A - A kind of high-strength tenacity semiaxis non-hardened and tempered steel and its production method instead of 42CrMo quenched and tempered steel - Google Patents
A kind of high-strength tenacity semiaxis non-hardened and tempered steel and its production method instead of 42CrMo quenched and tempered steel Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
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- 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
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C33/06—Making ferrous alloys by melting using master alloys
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- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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Abstract
The invention discloses a kind of high-strength tenacity semiaxis non-hardened and tempered steels and its production method instead of 42CrMo quenched and tempered steel, it includes following component according to weight percent (%): C:0.40 ~ 0.50, Si:0.30 ~ 1.00, Mn:1.30 ~ 1.60, P :≤0.025, S :≤0.025, Cu :≤0.20, Cr :≤0.30, Mo :≤0.30, Al :≤0.050, V:0.10 ~ 0.25, Nb :≤0.035, Ti :≤0.035, N :≤0.020, remaining original Fe.From component proportion and production method of the invention, pass through the optimization design of chemical component and the perfect combination of cooling controlling and rolling controlling process technology (rolling parameter), it the smelting process of the strict control formula and opens, finishing temperature and the type of cooling, realizes the production of high-strength tenacity semiaxis non-hardened and tempered steel.
Description
Technical field
The present invention relates to a kind of fields that high-strength tenacity semiaxis is produced with non-hardened and tempered steel, and in particular to a kind of to replace 42CrMo
The high-strength tenacity semiaxis non-hardened and tempered steel and its production method of quenched and tempered steel.
Background technique
Recently as the increase of auto output and car ownership, market competition is further fierce, automobile manufacture energy consumption
Increase rapidly, and the application of automobile non-hardened and tempered steel can effective energy-saving and emission-reduction, and reduce cost, can be saved using non-hardened and tempered steel
About the 30 ~ 40% of part manufacturing energy consumption can also reduce the 10 ~ 20% of cost, while can also reduce quenched quenching in the process and draw
The strain cracking risen improves efficiency 10% or more to simplify alignment process.
The kind and dosage of foreign countries' non-hardened and tempered steel are much higher than Chinese Automobile Industry ' at present, therefore develop high-strength tenacity, and height is cut
Processability is cut, inexpensive non-hardened and tempered steel expands application of the non-hardened and tempered steel in Domestic Automotive Industry, to meet China's automobile work
Industry energy-saving and emission-reduction and design lightweight demand are imperative.Domestic non-hardened and tempered steel kind and dosage are relatively fewer.However in heavy type
Automobile high-duty die forging products application field is less, and foreign countries reach in heavy-duty car forging components product Micro Alloying ratio
20% or more.
Therefore, a kind of production domesticization high-performance non-hardened and tempered steel 45MnSiVNb(Rm=950 ~ 1100Mpa is developed, Rel >=
650MPa), it is an important cost efficiency behave for non-tune into the melt of half axle of heavy-duty car, also complies with wanting for heavy-duty car development
It asks.
Summary of the invention
It is an object of the invention to: it overcomes the deficiencies of the prior art and provide a kind of tough instead of the height of 42CrMo quenched and tempered steel
Property semiaxis non-hardened and tempered steel and its production method, by the optimization design and cooling controlling and rolling controlling process technology of chemical component (rolling and
Roller repairing parameter) perfect combination, the smelting process of the strict control formula and open, finishing temperature and the type of cooling, realize
The production of high-strength tenacity semiaxis non-hardened and tempered steel.
Using non-hardened and tempered steel production technology manufacture, can effectively avoid Tempering and Quenching, thus eliminate it is quenched after
The processes such as aligning, stress elimination, by micro-alloying technology and control forging (rolling) control is cold ensures part structure property, therefore non-
The shortcomings that quenched and tempered steel semiaxis has many advantages, such as economic, energy conservation and environmental protection, can overcome traditional quenched semiaxis well, and this increasing is dropped
Effect improves lumber recovery and shortens the process-cycle.
It is stronger increasingly by heavy vapour that the workpiece performance produced by this method is more evenly, entirety bears load-carrying ability
The favor of vehicle manufacturing enterprise；Therefore the application prospect in China Heavy Automobile market is very wide.
Control the precipitation of tiny micro alloying element carbonitride phase and the soft phase of reinforced ferrite.
Control tiny micro alloying element niobium, vanadium, the precipitation of titanium carbon Nitride Phase and the soft phase of reinforced ferrite.
Increase Si constituent content, makes ferritic phase solution strengthening, while improving steel yield tensile ratio.
High nitrogen promotes a large amount of precipitations of vanadium carbide nitride in steel, the significant precipitation strength effect for playing V in steel；And carbon nitridation
Niobium effectively can inhibit high temperature austenite to grow up, fining austenite grains, be beneficial to improve the impact flexibility of non-hardened and tempered steel.
The application of V-Nb-Ti combined microalloying technology allows to realize that recrystallization+Unhydrated cement carries out controlled rolling control
It is cold, significantly improve the obdurability of non-hardened and tempered steel.
By the rational proportion of each ingredient, the physical index and each performance indicator for realizing steel meet and exceed design
Under the premise of it is required that, the production cost of steel is reduced as far as possible, improves the market competitiveness.
The technical solution used in the present invention is:
A kind of high-strength tenacity semiaxis non-hardened and tempered steel instead of 42CrMo quenched and tempered steel, includes following according to weight percent (%)
Ingredient: C:0.40 ~ 0.50, Si:0.30 ~ 1.00, Mn:1.30 ~ 1.60, P :≤0.025, S :≤0.025, Cu :≤0.20, Cr:
≤ 0.30, Mo :≤0.30, Al :≤0.050, V:0.10-0.25, Nb :≤0.035, Ti :≤0.035, N :≤0.020, remaining
Originally Fe.
It is a kind of high-strength tenacity semiaxis Micro Alloying instead of 42CrMo quenched and tempered steel that the present invention, which is further improved scheme,
Steel, ingredient further include H and O, and according to weight percent, guarantee [H]≤2.0ppm, [O]≤15ppm.
C:0.40% ~ 0.50%；
C: the important element of hardness of steel is determined.C is compared with other alloying elements, inexpensive, if it is possible to which a large amount of addition C then can
The cost of alloy of steel is enough reduced, and carbide can be formed with combinations such as carbide V, Ti, Mo, these carbon
Compound plays the role of precipitation strength and refined crystalline strengthening, is on the one hand conducive to intensity increase, on the other hand can pull matrix crystal boundary
And recrystallization is prevented, improve recrystallization temperature；But if adding a large amount of C, the piece stratification that will lead to pearlite is obvious,
And the lamella of pearlite has certain directionality, it is larger for the tension resistance capacity variance of different directions to will lead to workpiece,
Also result in toughness decline；Therefore the performance of considering cost and workpiece, so that the content of C is limited to 0.40% ~ 0.50%
In the range of.
Si:0.30% ~ 1.00%；
Si: significant reinforced ferrite has stronger solid solution strengthening effect, and can increase ferritic volume fraction, is conducive to
Toughness is improved, in addition Si is compared with other alloying elements, inexpensive, if it is possible to which a large amount of addition Si then can reduce steel
Cost of alloy；But Si too high levels can reduce the fatigue resistance for reducing steel and durability degree, this for being applied to semiaxis
For the workpiece that stress is frequent and Impact direction is different, the requirement for fatigue resistance and durability degree is than common steel requirement
It is higher；So the performance of considering cost and workpiece, so that the content of Si is limited to 0.30% ~ 1.00%.
Mn:1.30% ~ 1.60%；
Mn: it is to improve non-hardened and tempered steel intensity, improves the important alloying element of toughness.Mn element can also improve VC and VN in Austria
Solubility in family name's body facilitates it and is precipitated in ferrite, and when general Mn content is lower than 1.0%, Strengthening and Toughening effect is unknown
It is aobvious, increase the content of Mn, is conducive to pearlite colony and attenuates small, and reduce pearlite piece interlamellar spacing, also make cementite in pearlite
The thickness of piece is thinned；But when being especially greater than equal to 2.0% when the too high levels of Mn, pearlite will be improved
Volume fraction reduces the toughness of workpiece, this for being applied to this stress of semiaxis is frequent and Impact direction is different workpiece and
Speech is unfavorable；In addition Mn has the effect of forming sulfide in conjunction with S, improves machinability, but Mn and other alloying element phases
Than cost is in contrast higher；Therefore the performance of considering cost and workpiece, so that the content of Mn is limited to 1.30% ~
1.60%。
P :≤0.025%；
P: it can be improved matrix strength.P is compared with other alloying elements, although inexpensive, P has deformation in forging bright
Aobvious inhibiting effect；But be used in combination with Cu, improve the atmospheric corrosion resistance of Hi-Stren steel.So comprehensively considering
To the performance of workpiece, so that the content of P is limited to≤0.025%.
S :≤0.025%；
S: the toughness due to that can reduce workpiece belongs to impurity element in steel, should reduce to the greatest extent, be strict controlled in≤0.025%.
Cu :≤0.20%；
Cu: can improve the anti-corrosion capability of workpiece, and Cu can improve the tensile strength of workpiece by precipitation-hardening, and at those
Cu in the steel of precipitation-hardening does not occur can be improved yield strength；But as Cu > 0.2%, " copper brittleness " will be generated.Work as Cu >
When 0.2%, heating process makes Fe elder generation Cu and aoxidizes since selective oxidation occurs for surface, and the i.e. opposite increasing of surface layer Cu content
Add to form thin film, then to network containing Cu is diffuseed to form, is easy forge crack at 1030 DEG C；In addition, Cu and other alloys member
Element is compared, and cost is in contrast higher；Therefore the performance of considering cost and workpiece, so that the content of Cu is limited to≤
0.20%。
Cr :≤0.30%；
Cr: the important element of pearlite formation is contributed to, the intensity and toughness of workpiece can be improved.Cr will form it is stable and
Hard carbide, and have corrosion stability, high rigidity, high intensity, yield point, high-wearing feature, while influencing again not on plasticity, toughness
Greatly；In addition, superfine disperse phase can be obtained by reacting by addition V, Nb with Cr, it is extremely advantageous to fight compacted strong (heat resistance) improvement.Work as Cr
Content less than 0.20% when, it is relatively less obvious to obtain said effect, or even cannot get said effect, but due to China
Cr resource is very in short supply, should use Cr less as far as possible；So the performance of considering cost and workpiece, so that the content of Cr is limited to
≤0.30%。
Mo :≤0.30%；
Mo: the effect ratio W for refining crystal grain is stronger, so the overheat tendentiousness of steel can be reduced, improves intensity, hardness, thermal stability；
In steel the tensile strength, yield strength, hardness of forging can effectively promoted Mo；Mo is greatly improved harden ability in conjunction with Cr,
Crystal grain can be refined, toughness is improved, makes to forge handling ease；Meanwhile Mo can also improve the impact flexibility of steel, be very suitable for by
Power is complicated, frequently by the semiaxis impacted；And the heat resistance of pearlite can be improved in Mo.But Mo is that ferrite forms member
Element, so austenite in order to obtain, Ying Xiangying adds the austenite formers such as Mn, otherwise just easily occurs when Mo content is more
Ferrite δ phase or other brittlement phases and reduce toughness.In addition, Mo is compared with other alloying elements, cost is very expensive.Therefore
The performance of considering cost and workpiece, so that the content of Mo is limited to≤0.30%.
Al :≤0.050%；
Al: when its content is less than 3 ~ 5% in steel, the inoxidizability of steel can be improved.It, can as the Al that strong deoxidier is added
Fine crushing, submicroscopic the oxide of height is generated, is scattered in steel body product；As the Al that strong deoxidier is added, height is produced
Fine crushing, submicroscopic oxide is spent, is scattered in steel body product；When improving the inoxidizability of steel, aluminium is as final deoxidizing
The content of agent, Al is generally defined in≤0.050%, since Al is compared with other alloying elements, inexpensive, but also meeting and Cr
Reaction, so the performance of considering cost and workpiece, so that the content of Al is limited to≤0.050%.
V:0.10% ~ 0.25%；
V: can refine the grain structure of steel, improve the intensity of steel, toughness and wearability, the excellent deoxidier of V or steel.V and O, N
There is very big affinity, is also strong carbide element.The spread of general VC is very high and extremely stable.So it both sharp deoxidation,
Degassing obtains fine and close fine grained texture, improves plasticity, toughness and high intensity, and impact property and fatigue strength are all high compared with no V steel,
High temperature and low temperature (0 DEG C of <) have high-intensitive, toughness.Since the high degree of dispersion of VC prevents weld grain coarse, so can improve
The solderability of steel.But as V > 0.3%, show temper brittleness convex protrusion；And V is compared with other alloying elements, cost
Valuableness, therefore the performance of considering cost and workpiece, so that the content of V is limited to 0.10% ~ 0.25%.
Nb :≤0.035%；
Nb: can refine crystal grain and reduce the superheated susceptivity and temper brittleness of steel, improve intensity；And the solution strengthening effect of Nb
It is obvious that improving the harden ability (when being dissolved in austenite) of steel, increases temper resistance, have post-curing effect, improve the strong of steel
Degree, impact flexibility.But the hardness of steel will be reduced with the increase of Nb content, though while Nb can refine crystal grain and improve steel
Toughness, but when too high levels, will also generate ferrite δ phase or other brittlement phases, and make the reduction of its toughness, hot-working character becomes
It is bad.In addition, the effect of Nb is close with V, and for V, the effect of Nb effect close with V is much better than V, but Nb and its
Its alloying element is compared, expensive, and the price compared to V is higher by very much, so the performance of considering cost and workpiece, from
And the content of Nb is limited to≤0.035%.
Ti :≤0.035%；
Ti: can refine the grain structure of steel, to improve the intensity and toughness of steel, titanium is strong deoxidier in steel.It can make steel
Dense internal organization refines crystal grain power；Reduce aging sensitivity and cold brittleness；Titanium easily forms carbide TiC with carbon in steel,
TiC can reduce the overheat tendentiousness of steel；Ti is strong ferrite former, and Ti can be acted on S, reduces the hot-short work of sulphur
With；But the Ti steel of steel containing Ti, especially low-carbon, often because its molten steel viscosity is larger, and make wherein nonmetallic plus miscellaneous, is not easy
Separate emersion；Steel is that hardness is reduced with the increase of Ti content；Ti and N, O have very big affinity and easily shape TiN and
TiO2, steel in lower temperature, be formed more nonmetal inclusion and it is subcutaneous porous the defects of；As V, Ti content reaches
To 0.05% when just reduce the coercivity of steel.Moreover, Ti is compared with other alloying elements, it is expensive.Therefore, comprehensive
The performance for considering cost and workpiece, so that Ti content is limited to≤0.035%.
N :≤0.020%；
N:N can improve the intensity of steel, low-temperature flexibility and weldability, increase aging sensitivity.N is also strong austenite former
Element, it is similar to Ni in this regard, and stable austenite effect is more preferable, 27 times stronger than Ni effect, so N is likely to be instead of Ni's
One of important element；N can also borrow the precipitation of nitride in complicated austenitic steel and generate dispersion hardening；N can improve Gao Ge
Steel, the especially thermohardening of the high chrome containing V.But it is nonmetal inclusion that it and alloying element, which generate nitride, it is more important
Be reduction of alloys producing.When nitrogen in steel content is high, in 250 DEG C ~ 450 DEG C temperature ranges, surface is turned blue, steel
Intensity increases, and impact flexibility reduces, referred to as " blue shortness "；Steel containing N can significantly reduce in annealing process because nitride is precipitated
Its plasticity.Suitable aluminium is added in steel, produces stable AlN, Fe can be constrained4N is generated and is precipitated, and not only improves steel
Timeliness can also prevent growing up for austenite grain.Nitrogen, which can be used as alloying element, to be played the role of refining crystal grain.It is smelting
Chromium steel when the high-alloy steel such as nickel chromium triangle system steel or chromium manganese systems, is added suitable nitrogen, can improve plasticity and high temperature process performance；?
In Cr, N steel of certain content, there must be a minimum Mn content adaptable with it, such as be lower than this Mn content, steel N in solidification
It will escape, form stomata.In addition, the ability of ferrite dissolved nitrogen is very low, by the N in air under high pressure-temperature2Iron is added
Water, difficulty is very big and has certain risk.When in steel dissolved with oversaturated N, after placing longer period of time or with
N will occur with the precipitation of nitride form in 200 DEG C ~ 300 DEG C heating afterwards, and improve the hardness of steel, intensity, under plasticity
Drop.Al, Ti or V are added in molten steel and carries out solid N processing, is fixed on N in AlN, TiN or VN.So considering cost and work
The performance of part, so that the content of N is limited to≤0.020%.
A kind of method of high-strength tenacity semiaxis non-hardened and tempered steel instead of 42CrMo quenched and tempered steel is produced the following steps are included: iron
Water desulfurization → LD → LF → RH → continuous casting → cutting → cooling → inspection → judgement → heating stove heating → controlled rolling → control is cold → super
Sound+magnetic leakage detection → judgement → packaging → weighing → storage.
The further improvement project of the present invention is to select high-quality steel scrap, is forbidden using containing harmful residuals such as higher Cu, Pb
The steel scrap of element controls Cu≤0.20%.
The further improvement project of the present invention is, before tapping, prebake conditions in ladle are added in alloy.
The further improvement project of the present invention is that strict control goes out composition of steel, forbids slag of tapping.
The further improvement project of the present invention is to control tapping temperature, forbids cold melt.
The further improvement project of the present invention is to require control terminal ingredient in strict accordance with technique, prevent Molten Steel over-oxidation.
The further improvement project of the present invention is, when carrying out LF smelting by the high cleanliness steel of LD, when controlling LF bull ladle
Mn content be 1.10% ~ 1.40%, while refine mid-term be separately added into vanadium iron, ferro-niobium, molybdenum-iron and nickel plate, refining the later period be added
Ferrotianium.
The further improvement project of the present invention is, vacuum degree≤100Pa of RH and vacuum retention time >=20 minute；RH is broken
Hydrogen is determined after sky: [H]≤2.0ppm；Then thermometric is sampled, feeds nitrogenized manganese silk thread after breaking sky；According to Al in spectral component before soft blow
The content of silicon-calcium wire is added to determine for content, to Al2O3Field trash carries out denaturation treatment.
The further improvement project of the present invention is soft blow argon 15 minutes or more the bull ladles after ingredient is uniform.
The further improvement project of the present invention is that baking of tundish, big packet long nozzle, submersed nozzle roasting in place, are prevented
Only molten steel cooling is excessive.
The further improvement project of the present invention is big packet long nozzle blowing argon, reduces secondary oxidation of steel phenomenon.
The further improvement project of the present invention is, middle packet uses slag blocking wall, 25~35 DEG C of strict control molten steel overheat and
Drawing speed, using permanent degree of superheat perseverance pulling rate, it is ensured that the stabilization of liquid level.
The further improvement project of the present invention is, each to flow normal use M-EMS and end electromagnetic agitation dress
It sets, improves slab inherent quality.
The further improvement project of the present invention is that guarantee submersed nozzle insertion mold liquid level depth is 120mm, and steady
Surely mold liquid level is controlled, mold liquid level slag is prevented.
The further improvement project of the present invention is control tundish high liquid level casting.
The further improvement project of the present invention is to carry out water distribution with water system in strict accordance with technique secondary cooling water, it is ensured that two is cold
Water water nozzle does not block, and cooling is uniform and stable, and slab is avoided internal flaw occur.
The further improvement project of the present invention is that the defects of trail billet cut amount cuts foot, avoids shrinking hole remnant base flows into lower road
Process.
The further improvement project of the present invention is that the furnace temperature heated before the rolling of steel material is as shown in Figure 1.
The further improvement project of the present invention is start rolling temperature: 950 ~ 1020 DEG C, finishing temperature :≤920 DEG C, workpiece table
The temperature difference≤30 DEG C of face temperature.
The further improvement project of the present invention is,
Strong air-cooler is arranged in cold bed entrance side, and Surface of Rod Bar temperature is cooled to 400 ~ 500 DEG C as early as possible.It is slow to enter hole after lower cold bed
Cold (enter and cheat temperature: 370 ~ 420 DEG C) cheats temperature≤200 DEG C out.
The further improvement project of the present invention is that for plus tolerance rolling, the workpiece after rolling has corase grinding surplus for controlled rolling.
The further improvement project of the present invention is that the workpiece is completed after rolling and cooling down, and it is then right again first to carry out roughly grinding
Workpiece carries out ultrasound and magnetic leakage detection.
The further improvement project of the present invention is correction step of the workpiece after vortex/leakage field, ultrasonic examination
Are as follows: by checking short ruler, single multiple length and scale.
The beneficial effects of the present invention are:
The first, a kind of high-strength tenacity semiaxis non-hardened and tempered steel and its production method instead of 42CrMo quenched and tempered steel of the invention leads to
Cross the optimization design of chemical component and the perfect combination of cooling controlling and rolling controlling process technology (rolling parameter), the smelting of the strict control formula
Sweetening process and start rolling temperature, finishing temperature and the type of cooling realize the production of high-strength tenacity semiaxis non-hardened and tempered steel.
The second, a kind of high-strength tenacity semiaxis non-hardened and tempered steel and its producer instead of 42CrMo quenched and tempered steel of the invention
Method, using non-hardened and tempered steel production technology manufacture, can effectively avoid Tempering and Quenching, thus eliminate it is quenched after aligning,
The processes such as stress elimination, by micro-alloying technology and control forging (rolling) control is cold ensures part structure property, therefore Micro Alloying
The shortcomings that steel semiaxis has many advantages, such as economic, energy conservation and environmental protection, and traditional semiaxis can be overcome to manufacture well, and cost efficiency, mention
High yield and shortening process-cycle.
Third, a kind of high-strength tenacity semiaxis non-hardened and tempered steel and its producer instead of 42CrMo quenched and tempered steel of the invention
Method, it is stronger increasingly by automobile that the section performance for the workpiece produced by this method is more evenly, entirety bears load-carrying ability
The favor of mating enterprise；Therefore the application prospect in heavy-duty car market is very wide.
4th, a kind of high-strength tenacity semiaxis non-hardened and tempered steel and its producer instead of 42CrMo quenched and tempered steel of the invention
Method controls the precipitation of tiny micro alloying element carbonitride phase and the soft phase of reinforced ferrite.
5th, a kind of high-strength tenacity semiaxis non-hardened and tempered steel and its producer instead of 42CrMo quenched and tempered steel of the invention
Method controls tiny micro alloying element niobium, the precipitation of vanadium carbonitride phase and the soft phase of reinforced ferrite.
6th, a kind of high-strength tenacity semiaxis non-hardened and tempered steel and its producer instead of 42CrMo quenched and tempered steel of the invention
Method increases Si constituent content, makes ferritic phase solution strengthening, while improving steel yield tensile ratio.
7th, a kind of high-strength tenacity semiaxis non-hardened and tempered steel and its producer instead of 42CrMo quenched and tempered steel of the invention
Method, high nitrogen promotes VN particle to be largely precipitated in steel, VN can effective fining austenite grains, promote the precipitation of Intragranular Acicular Ferrite, have
The coarse pearlite colony of the segmentation of effect, improves the impact flexibility of non-hardened and tempered steel, and nitrogen pick-up can also further promote in steel in steel
The precipitation of vanadium carbide nitride, the significant precipitation strength effect for playing V.
8th, a kind of high-strength tenacity semiaxis non-hardened and tempered steel and its producer instead of 42CrMo quenched and tempered steel of the invention
Method, the application of V-Nb-Ti micro-alloying technology allow to realize that recrystallization+Unhydrated cement carries out controlled rolling and controlled cooling, significantly mention
The obdurability of high non-hardened and tempered steel.
9th, a kind of high-strength tenacity semiaxis non-hardened and tempered steel and its producer instead of 42CrMo quenched and tempered steel of the invention
Method, by the rational proportion of each ingredient, the physical index and performance indexes of steel meet and exceed design requirement
Under the premise of, the production cost of steel is reduced as far as possible, improves the market competitiveness.
Detailed description of the invention
Fig. 1 is the furnace temperature of heating before the rolling of steel material.
Fig. 2 is the structure enlarged drawing of the embodiment of the present invention 1.
Fig. 3 is the pearlitic texture enlarged drawing of the embodiment of the present invention 2.
Fig. 4 is the ferrite grain size of the embodiment of the present invention 3.
Specific embodiment:
Embodiment 1
A kind of method of high-strength tenacity semiaxis non-hardened and tempered steel instead of 42CrMo quenched and tempered steel is produced the following steps are included: molten iron is de-
Sulphur → LD → LF → RH → continuous casting → cutting → cooling → inspection → judgement → heating stove heating → controlled rolling → control is cold → ultrasound+leakage
Magnetic spy wound → judgement → packaging → weighing → storage.
High-quality steel scrap is selected, forbids to control Cu≤0.20% using the steel scrap containing harmful residuals elements such as higher Cu, Pb.
Before tapping, prebake conditions in ladle are added in alloy.
Strict control goes out composition of steel, forbids slag of tapping.
Tapping temperature is controlled, cold melt is forbidden.
Control terminal ingredient is required in strict accordance with technique, prevents Molten Steel over-oxidation.
When carrying out LF smelting by the high cleanliness steel of LD, Mn content when controlling LF bull ladle is 1.20%, while in refining
Phase is separately added into vanadium iron, ferro-niobium, molybdenum-iron and nickel plate, ferrotianium is added in the refining later period.
The further improvement project of the present invention is, the vacuum degree 80Pa of RH and the vacuum retention time 20 minutes；After the broken sky of RH
Determine hydrogen: [H]≤2.0ppm；Then thermometric is sampled, feeds nitrogenized manganese silk thread after breaking sky；According to Al content in spectral component before soft blow
Come determine be added silicon-calcium wire content, to Al2O3Field trash carries out denaturation treatment.
30 minutes bull ladles after ingredient is uniform of soft blow argon.
Baking of tundish, big packet long nozzle, submersed nozzle roasting in place, prevent molten steel cooling excessive.
Big packet long nozzle blowing argon, reduces secondary oxidation of steel phenomenon.
Middle packet uses slag blocking wall, 30 DEG C of strict control molten steel overheat and drawing speed, using permanent degree of superheat perseverance pulling rate, really
Protect the stabilization of liquid level.
Each stream normal use M-EMS and end electromagnetic stirring device, improve slab inherent quality.
Guarantee that submersed nozzle is inserted into mold liquid level depth as 120mm, and stability contorting mold liquid level, prevents from crystallizing
Device liquid level slag.
Control the casting of tundish high liquid level.
Water distribution is carried out with water system in strict accordance with technique secondary cooling water, it is ensured that secondary cooling water water nozzle does not block, and cooling is uniform and stable,
Slab is avoided internal flaw occur.
The defects of trail billet cut amount cuts foot, avoids shrinking hole remnant base flows into next procedure.
The furnace temperature heated before the rolling of steel material is as shown in Figure 1.
Start rolling temperature: 1000 DEG C, finishing temperature: 900 DEG C, 20 DEG C of the temperature difference of workpiece surface temperature.
Strong air-cooler is arranged in cold bed entrance side, and Surface of Rod Bar temperature is cooled to 480 DEG C as early as possible.It is slow to enter hole after lower cold bed
Cold (enter and cheat temperature: 400 DEG C) cheats 150 DEG C of temperature out.
For plus tolerance rolling, the workpiece after rolling has corase grinding surplus for controlled rolling.
The workpiece is completed after rolling and cooling down, and first carries out roughly grinding and carry out ultrasound and magnetic leakage detection to workpiece again.
Correction step of the workpiece after vortex/leakage field, ultrasonic examination are as follows: by checking short ruler, single multiple length and determining
Ruler.
It measures according to the preparation-obtained steel of embodiment 1, includes following component according to weight percent (%): C:0.43,
Si:0.51, Mn:1.42, P:0.021, S:0.018, Cu:0.18, Cr:0.24, Mo:0.29, Al:0.042, V:0.17, Nb:
0.031, Ti:0.033, N:0.013, [H]: 1.5ppm, [O]: 10ppm；Remaining original Fe.
Embodiment 2
A kind of method of high-strength tenacity semiaxis non-hardened and tempered steel instead of 42CrMo quenched and tempered steel is produced the following steps are included: molten iron is de-
Sulphur → LD → LF → RH → continuous casting → cutting → cooling → inspection → judgement → heating stove heating → controlled rolling → control is cold → ultrasound+leakage
Magnetic spy wound → judgement → packaging → weighing → storage.
The further improvement project of the present invention is to select high-quality steel scrap, is forbidden using containing harmful residuals such as higher Cu, Pb
The steel scrap of element controls Cu≤0.20%.
Before tapping, prebake conditions in ladle are added in alloy.
Strict control goes out composition of steel, forbids slag of tapping.
Tapping temperature is controlled, cold melt is forbidden.
Control terminal ingredient is required in strict accordance with technique, prevents Molten Steel over-oxidation.
When carrying out LF smelting by the high cleanliness steel of LD, Mn content when controlling LF bull ladle is 1.18%, while in refining
Phase is separately added into vanadium iron, ferro-niobium, molybdenum-iron and nickel plate, ferrotianium is added in the refining later period.
The vacuum degree 100Pa of RH and the vacuum retention time 30 minutes；Hydrogen is determined after the broken sky of RH: [H]≤2.0ppm；Then it samples
Thermometric feeds nitrogenized manganese silk thread after breaking sky；The content that silicon-calcium wire is added is determined before soft blow according to Al content in spectral component, it is right
Al2O3Field trash carries out denaturation treatment.
25 minutes bull ladles after ingredient is uniform of soft blow argon.
Baking of tundish, big packet long nozzle, submersed nozzle roasting in place, prevent molten steel cooling excessive.
Big packet long nozzle blowing argon, reduces secondary oxidation of steel phenomenon.
Middle packet uses slag blocking wall, 35 DEG C of strict control molten steel overheat and drawing speed, using permanent degree of superheat perseverance pulling rate, really
Protect the stabilization of liquid level.
Each stream normal use M-EMS and end electromagnetic stirring device, improve slab inherent quality.
Guarantee that submersed nozzle is inserted into mold liquid level depth as 120mm, and stability contorting mold liquid level, prevents from crystallizing
Device liquid level slag.
Control the casting of tundish high liquid level.
Water distribution is carried out with water system in strict accordance with technique secondary cooling water, it is ensured that secondary cooling water water nozzle does not block, and cooling is uniform and stable,
Slab is avoided internal flaw occur.
The defects of trail billet cut amount cuts foot, avoids shrinking hole remnant base flows into next procedure.
The furnace temperature heated before the rolling of steel material is as shown in Figure 1.
Start rolling temperature: 980 DEG C, finishing temperature: 860 DEG C, 20 DEG C of the temperature difference of workpiece surface temperature.
Strong air-cooler is arranged in cold bed entrance side, and Surface of Rod Bar temperature is cooled to 420 DEG C as early as possible.It is slow to enter hole after lower cold bed
Cold (enter and cheat temperature: 380 DEG C) cheats 180 DEG C of temperature out.
For plus tolerance rolling, the workpiece after rolling has corase grinding surplus for controlled rolling.
The workpiece is completed after rolling and cooling down, and first carries out roughly grinding and carry out ultrasound and magnetic leakage detection to workpiece again.
Correction step of the workpiece after vortex/leakage field, ultrasonic examination are as follows: by checking short ruler, single multiple length and determining
Ruler.
It measures according to the preparation-obtained steel of embodiment 2, includes following component according to weight percent (%): C:0.46,
Si:0.37, Mn:1.43, P:0.014, S:0.012, Cu:0.15, Cr:0.26, Mo:0.26, Al:0.037, V:0.23, Nb:
0.027, Ti:0.032, N:0.013, [H]: 1.3ppm, [O]: 13ppm；Remaining original Fe.
Embodiment 3
A kind of method of high-strength tenacity semiaxis non-hardened and tempered steel instead of 42CrMo quenched and tempered steel is produced the following steps are included: molten iron is de-
Sulphur → LD → LF → RH → continuous casting → cutting → cooling → inspection → judgement → heating stove heating → controlled rolling → control is cold → ultrasound+leakage
Magnetic spy wound → judgement → packaging → weighing → storage.
High-quality steel scrap is selected, forbids to control Cu≤0.20% using the steel scrap containing harmful residuals elements such as higher Cu, Pb.
Before tapping, prebake conditions in ladle are added in alloy.
Strict control goes out composition of steel, forbids slag of tapping.
Tapping temperature is controlled, cold melt is forbidden.
Control terminal ingredient is required in strict accordance with technique, prevents Molten Steel over-oxidation.
When carrying out LF smelting by the high cleanliness steel of LD, Mn content when controlling LF bull ladle is 1.23%, while in refining
Phase is separately added into vanadium iron, ferro-niobium, molybdenum-iron and nickel plate, ferrotianium is added in the refining later period.
The further improvement project of the present invention is, the vacuum degree 100Pa of RH and the vacuum retention time 20 minutes；After the broken sky of RH
Determine hydrogen: [H]≤2.0ppm；Then thermometric is sampled, feeds nitrogenized manganese silk thread after breaking sky；According to Al content in spectral component before soft blow
Come determine be added silicon-calcium wire content, to Al2O3Field trash carries out denaturation treatment.
20 minutes bull ladles after ingredient is uniform of soft blow argon.
Baking of tundish, big packet long nozzle, submersed nozzle roasting in place, prevent molten steel cooling excessive.
Big packet long nozzle blowing argon, reduces secondary oxidation of steel phenomenon.
Middle packet uses slag blocking wall, 30 DEG C of strict control molten steel overheat and drawing speed, using permanent degree of superheat perseverance pulling rate, really
Protect the stabilization of liquid level.
Each stream normal use M-EMS and end electromagnetic stirring device, improve slab inherent quality.
Guarantee that submersed nozzle is inserted into mold liquid level depth as 120mm, and stability contorting mold liquid level, prevents from crystallizing
Device liquid level slag.
Control the casting of tundish high liquid level.
Water distribution is carried out with water system in strict accordance with technique secondary cooling water, it is ensured that secondary cooling water water nozzle does not block, and cooling is uniform and stable,
Slab is avoided internal flaw occur.
The defects of trail billet cut amount cuts foot, avoids shrinking hole remnant base flows into next procedure.
The furnace temperature heated before the rolling of steel material is as shown in Figure 1.
Start rolling temperature: 980 DEG C, finishing temperature: 850 DEG C, 30 DEG C of the temperature difference of workpiece surface temperature.
Strong air-cooler is arranged in cold bed entrance side, and Surface of Rod Bar temperature is cooled to 480 DEG C as early as possible.It is slow to enter hole after lower cold bed
Cold (enter and cheat temperature: 400 DEG C) cheats 180 DEG C of temperature out.
For plus tolerance rolling, the workpiece after rolling has corase grinding surplus for controlled rolling.
The workpiece is completed after rolling and cooling down, and first carries out roughly grinding and carry out ultrasound and magnetic leakage detection to workpiece again.
Correction step of the workpiece after vortex/leakage field, ultrasonic examination are as follows: by checking short ruler, single multiple length and determining
Ruler.
It measures according to the preparation-obtained steel of embodiment 3, includes following component according to weight percent (%): C:0.42,
Si:0.37, Mn:1.53, P:0.016, S:0.012, Cu:0.14, Cr:0.28, Mo:0.27, Al:0.038, V:0.24, Nb:
0.032, Ti:0.031, N:0.017, [H]: 1.4ppm, [O]: 12ppm；Remaining original Fe.
Claims (10)
1. a kind of high-strength tenacity semiaxis non-hardened and tempered steel instead of 42CrMo quenched and tempered steel, it is characterised in that: described to replace 42CrMo
The high-strength tenacity semiaxis non-hardened and tempered steel of quenched and tempered steel includes following component according to weight percent (%): C:0.40 ~ 0.50, Si:
0.30 ~ 1.00, Mn:1.30 ~ 1.60, P :≤0.025, S :≤0.025, Cu :≤0.20, Cr :≤0.30, Mo :≤0.30, Al:
≤ 0.050, V:0.10-0.25, Nb :≤0.035, Ti :≤0.035, N :≤0.020, remaining original Fe.
2. a kind of high-strength tenacity semiaxis non-hardened and tempered steel instead of 42CrMo quenched and tempered steel as described in claim 1, feature exist
In: the ingredient of the high-strength tenacity semiaxis non-hardened and tempered steel instead of 42CrMo quenched and tempered steel further includes H and O, and according to weight
Percentage, [H]≤2.0ppm, [O]≤15ppm.
3. producing a kind of high-strength tenacity semiaxis instead of 42CrMo quenched and tempered steel as described in claims 1 or 2 wherein any one
With the method for non-hardened and tempered steel, it is characterised in that the following steps are included: desulfurizing iron → LD → LF → RH → continuous casting → cutting → cold
But → inspection → judgement → heating stove heating → controlled rolling → control is cold → and ultrasound+magnetic leakage detection → judgement → packaging → weighs → enters
Library.
4. a kind of producer of the high-strength tenacity semiaxis non-hardened and tempered steel instead of 42CrMo quenched and tempered steel as claimed in claim 3
Method, it is characterised in that: by LD high cleanliness steel carry out LF smelting when, control LF bull ladle when Mn content be 1.10% ~
1.40%, while refining mid-term and being separately added into vanadium iron, ferro-niobium, molybdenum-iron and nickel plate, refining later period addition ferrotianium.
5. a kind of producer of the high-strength tenacity semiaxis non-hardened and tempered steel instead of 42CrMo quenched and tempered steel as claimed in claim 3
Method, it is characterised in that: vacuum degree≤100Pa of RH and vacuum retention time >=20 minute；Hydrogen is determined after the broken sky of RH: [H]≤
2.0ppm；Then thermometric is sampled, feeds nitrogenized manganese silk thread after breaking sky；Addition is determined before soft blow according to Al content in spectral component
The content of silicon-calcium wire, to Al2O3Field trash carries out denaturation treatment.
6. a kind of producer of the high-strength tenacity semiaxis non-hardened and tempered steel instead of 42CrMo quenched and tempered steel as claimed in claim 5
Method, it is characterised in that: soft blow argon 15 minutes or more the bull ladles after ingredient is uniform.
7. a kind of producer of the high-strength tenacity semiaxis non-hardened and tempered steel instead of 42CrMo quenched and tempered steel as claimed in claim 3
Method, it is characterised in that: start rolling temperature when controlled rolling :≤1000 DEG C, finishing temperature :≤900 DEG C, control cold take air-cooled technique；
When rolling, the temperature difference≤30 DEG C of workpiece surface temperature.
8. a kind of producer of the high-strength tenacity semiaxis non-hardened and tempered steel instead of 42CrMo quenched and tempered steel as claimed in claim 3
Method, it is characterised in that: for plus tolerance rolling, the workpiece after rolling has corase grinding surplus for controlled rolling.
9. a kind of producer of the high-strength tenacity semiaxis non-hardened and tempered steel instead of 42CrMo quenched and tempered steel as claimed in claim 3
Method, it is characterised in that: the workpiece is completed after rolling and cooling down, and is first carried out roughly grinding and then be visited again to workpiece progress ultrasound and leakage field
Wound.
10. a kind of producer of the high-strength tenacity semiaxis non-hardened and tempered steel instead of 42CrMo quenched and tempered steel as claimed in claim 3
Method, it is characterised in that: correction step of the workpiece after leakage field, ultrasonic examination are as follows: check short ruler, single multiple length and scale.
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