CN102363210A - Production process for 48MnV round steel - Google Patents
Production process for 48MnV round steel Download PDFInfo
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Abstract
The invention discloses a production process for 48MnV round steel. In the invention, continuous casting dynamic soft reduction and heavy draught rolling processes are combined for producing 48MnV round steel. The production process comprises the following specific steps of: manufacturing a 48MnV casting blank meeting a certain requirement by using the continuous casting dynamic soft reduction process; in a rolling production line, heating the casting blank and rolling by adopting the heavy draught process, wherein the rolling compression ratio is more than or equal to 6.0; controlling the initial rolling temperature at 1,180-1,050 DEG C and controlling the final rolling temperature at 950-920 DEG C; and slowly cooling, rectifying, performing ultrasonic wave and eddy current fault detection, packing and warehousing to obtain the 48MnV round steel. In the production process, the continuous casting dynamic soft reduction and heavy draught rolling processes are combined, bulk compaction, crack press fit, segregation improvement and inclusion dispersion are realized, the density and uniformity of steel are improved, and the mechanical performance of the steel is improved.
Description
Technical field
The invention belongs to the metallurgy rolling field, relate to and a kind of continuous casting dynamically gently being depressed and the production technology of depressing the 48MnV round steel that rolling mill practice combines greatly.
Background technology
48MnV is that non-hardened and tempered steel is used in forge hot, is mainly used in the manufacturing crankshaft of diesel engine, and the 48MnV steel is that Mn-V is pearlite+ferrite type non-hardened and tempered steel, in order to obtain better comprehensive mechanical property, has adopted the continuous casting blooms solidification end dynamically gently to depress technology.
Solidification end is dynamically gently depressed technology and is started from late 1970s, the beginning of the eighties; Be on the basis of roll gap contraction technology, to grow up; Its basic principle is at continuous casting billet liquid core end continuous casting billet to be implemented certain drafts (4 ~ 14mm); Compensation or offset the casting blank solidification amount of contraction is restrained the remaining molten steel that is rich in segregation element that solidification shrinkage causes to the strand center flow, thereby is reached the purpose of improving strand center segregation and center porosity.This technology is at first in the application of succeeding of company of Japanese Nippon Steel; At present; Solidification end is gently depressed technology and in sheet billet continuous casting, bloom continuous casting, has been obtained using comparatively widely; And think that gently depressing technology is further to eliminate the best approach of continuous casting blooms gross segregation up to now, and be to improve the quality of products and develop the important means of high value added product, become the important component part of continuous casting key technology.Continuous casting billet should avoid cold by force in time more than 1300 ℃ in addition, prevents that surface and underbead crack from appearring in strand, and this mainly is that real-time automatic adjustment technology through secondary cooling water flow and vibration frequency guarantees.Microalloy elements such as carbon, sulphur, phosphorus, aluminium, nitrogen, niobium, vanadium are the key factors that influences the steel crack sensitivity in the molten steel; When strand is cooled to 1000 ℃ of regional alignings of following austenitic temperature; Fine Nb, the compound of V are separated out along austenite grain boundary in the strand; What make steel prolongs the plasticity variation, causes casting billet surface to be prone to crack.Weak cold energy reduces the thermal stress of strand, avoids in brittle zone, 900 ℃ of left and right sides the aligning crackle taking place, and prevents that the fine crack that has existed in the base shell from further expanding, and also can improve the inhomogeneities of base surface temperature simultaneously.
Center porosity and center segregation are the typical internal flaws of high medium carbon steel continuous casting blooms; It is because steel dendrite in process of setting is flourishing; Form dendrite " bridging " at the strand core easily; Add process of setting choosing and divide the effect of crystallization a large amount of low-melting solutes that made the interdendritic enrichment, solidifying latter stage, the residual liquid that the powerful suction force that the solidification shrinkage of casting blank solidification end solid-liquid two-phase region produces causes enrichment impurity between dendrite to center flow and filling in wherein; Thereby produce the strand center segregation, and be attended by defectives such as center porosity and remaining shrinkage cavity.Dynamically gently depressing technology promptly is accurately to confirm the casting blank solidification end position, and through in the solidification end zone strand being applied even external force, forms certain decrement and compensate the internal void that forms because of the casting blank solidification contraction.This can eliminate or reduce strand on the one hand and shrink the internal void that forms, and prevents that the molten steel of intergranular enrichment solute from flowing to the strand central cross; Gently depress solute molten steel that the squeezing action of generation can also make enrichment in the liquid core on the other hand along throwing direction reverse flow, solute element is redistributed in molten steel.Thereby the solidified structure that makes strand is more even, fine and close, reaches to improve center segregation and the purpose that reduces center porosity.
Correlative study shows that < 30% the time, center porosity and center segregation can take place hardly, gently depress or bigger contraction roll gap amount if adopt this moment, and bleed-out or strand produce bulge easily on the contrary, increase the incidence of underbead crack as strand center solid rate fs.And when the solid rate fs=100% of strand center, center porosity and center segregation have formed, and then gently depress and can not control it, do not have the due effect of improving.Therefore, the steel mill that employing is both at home and abroad gently depressed, it gently depresses the active region in the scope of fs=30% ~ 100%.
Conticaster control system controls function flexibly and can satisfy above technological requirement fully, can cast any position of conductance in system at casting machine, and amount of contraction increases from zero gradually, up to optimal effect.
Casting process is continuously dynamic process, and factors such as invar coolant-temperature gage, strand size, steel grade, pulling rate, injection flow rate constantly change, and what make strand solidifies the final position also in continuous variation.Finding freezing point accurately and implementing gently to depress is to realize the dynamic key link of gently depressing.
The conticaster system calculates inner liquid core rate of strand and solidification rate and distributes according to parameters such as poring rate, steel grade, slab thickness and liquid steel temperatures.Provide desirable roll gap shrinkage curve through secondary process machine then, and implement gently to depress, become the defectives such as center porosity, center segregation and underbead crack that produce when solid-state by liquid state to alleviate strand at the roll gap constriction zone.
The control system that dynamically gently depresses is made up of a level system and level two.The one-level systemic-function: the one, position measurement and signal of telecommunication transmission, the 2nd, hydraulic system operation; The level two function: the one, model selection; The 2nd, calculate desirable roll gap parameter according to the operational factor of casting machine and deliver to the primary PLC system, the data command that a level system is sent here according to level two and the measured value of position sensor are adjusted through hydraulic valve bank; Control SMART fan-shaped section adjustment roll gap; Adapt to the demand of different continuous casting process such as different steel grades, different casting, to reach desirable state, its systemic-function is following:
(1) casting stream according to the real process data with the casting stream information follows the tracks of.
(2) calibrate fan-shaped section automatically.
(3) setting value is calculated, and it comes from the fixed value of roller slit of each fan-shaped section, depends on the data of casting stream tracking collection and the measured value of roll gap.
(4) can adopt static control or dynamically control according to actual conditions.
Aspect continuous casting, adopted the middle low-carbon (LC) privacy protection slag and the mold liquid level automatic control technology that are difficult for being involved in, kept the stable of mold liquid level, prevent the volume slag of crystallizer protecting residue.
Bloom is depressed rolling technique greatly: the root of surface quality and internal flaw is often at continuous casting; Rollingly the rolled piece internal soundness is improved even eliminate through rolling particularly depressing greatly, as: loose compacting, crackle pressing, improve segregation, disperse to be mingled with.
Underbead crack is a kind of mass defect of danger, can find through modes such as flaw detections.Usually underbead crack breeds in continuous casting, and loose and micro-crack might develop into crackle in rolling, also might be by pressing, compacting, and the decisive factor of crackle evolving trend:
Stress state: tension → crackle expansion, enough compression → healing, other: temperature improves, and reduction ratio improves, and mill speed reduces, and helps healing.
The problem that does not conform to the product flaw detection qualification rate conducts a research, and the influence flaw detection does not conform to the analysis of causes; Centre burst, center porosity, interior field trash, problem root are at continuous casting, and optimizing rolling procedure can alleviate, and optimizes an important parameter of rules: deformed area deformation parameter L/h, and L/h is little, and thick, the twin drum distortion, L/h is big, thin part, single-drum distortion.
Professor Liu Xianghua of Northeastern University utilizes upper bounding method to derive to having introduced professor Zhao Dewen of Northeastern University etc.:
L/h>0.518 center compression, help crack healing.L/h < 0.518 center tension, then crackle expansion.Compression is deep into rolled piece inside fully, and dendritic crystal is broken easily.
Rolling through depressing greatly in austenite non-recrystallization district, can increase crystal defects such as the austenitic crystal boundary of deformation, deformation band and dislocation twin effectively, thereby improve effective grain boundary area of forming core, and then improve nucleation rate, crystal grain thinning.Therefore, the distortion of carrying out low temperature, heavy reduction in austenite non-recrystallization district is one of effective method that obtains ultra-fine ferrite crystal grain.Adopting multi-pass to accumulate large deformation rolling is the method that obtains the new crystal grain thinning of ultra-fine ferrite crystal grain, i.e. strain-induced transformation and ferritic dynamic recrystallization.Can obtain the crystallite dimension of 2～3um under low temperature, heavy reduction and the situation of short intermittent time.
Summary of the invention
The production technology that the purpose of this invention is to provide a kind of 48MnV round steel; This production technology is dynamically gently depressed continuous casting and is depressed rolling mill practice greatly and combines; Realize loose compacting, crackle pressing, improve segregation, disperse to be mingled with; With density, the uniformity of improving steel, thereby improve the mechanical performance of steel.
The objective of the invention is to realize through following technical scheme:
A kind of production technology of 48MnV round steel is characterized in that: this production technology is dynamically gently depressed continuous casting and is depressed rolling mill practice greatly and combine and produce the 48MnV round steel, and concrete steps are following:
1) adopts continuous casting dynamically gently to depress technology and obtain satisfactory 48MnV strand; 48MnV its composition by weight percentage is: C 0.45～0.51% Si 0.17～0.37% Mn 1.00～1.20% V 0.06～0.11% Ti 0.000～0.025 Cr 0.05～0.25% Mo 0.00～0.06 % Ni 0.00～0.06% Cu 0.00～0.20% N 0.080～0.0200% P≤0.035% S≤0.035% O≤0.020% Ceq, 0.087～0.097 surplus be Fe and with inevitably be mingled with;
2) at rolling line, to the strand heating, it is rolling that technology is depressed in employing greatly, rolling compression ratio >=6.0; Start rolling temperature is controlled at 1180-1050 ℃, and finishing temperature is controlled at 950-920 ℃;
3) product obtains the 48MnV round steel through slow cooling, finishing, ultrasonic eddy current inspection, packing, the warehouse-in of involving.
Among the present invention, 48MnV strand composition by weight percentage is preferably: C 0.45～0.48%, Si 0.18～0.26%, Mn 1.06～1.15%, V 0.07～0.10%, Ti 0.013～0.025, Cr 0.10～0.16%, Mo≤0.05 %, Ni≤0.20%, Cu≤0.15%, N 0.0100～0.0120%, P≤0.025% S≤0.005 ~ 0.025%, O≤0.0012%, Ceq 0.088～0.096 surplus are Fe and and inevitably are mingled with.
Among the present invention, the effect of each element:
1) C carbon in all elements improves the ability maximum of intensity; Carbon is approximately 5 times of silicon to the strengthening effect of steel, 9 times of chromium with manganese 18 times, and institute thinks that assurance 48MnV steel has enough intensity, hardness; Performances such as antifatigue must contain quite high carbon content in the steel.
2) Si solution strengthening, precipitation strength and refined crystalline strengthening can both make the dislocation moving difficulty, thereby can effectively improve the intensity of steel, and silicon also is prone to reduce the plasticity and the toughness of steel.
3) Mn, Cr play invigoration effect to steel.
4) V, Ti all are strong carbide forming elements, and the effect of precipitation strength and refined crystalline strengthening is arranged in steel.Research to non-hardened and tempered steel has confirmed this point.
5) N: compound with V, Ti, play the refined crystalline strengthening effect.
The 48MnV round steel is that Mn-V is pearlite+ferrite type non-hardened and tempered steel, is mainly used in the manufacturing crankshaft of diesel engine.In order to obtain better comprehensive mechanical property; Adopted continuous casting blooms dynamically gently to depress technology during smelting; Adopted when rolling and depressed rolling mill practice greatly, the present invention superposes these two technologies and is used in the production of non-hardened and tempered steel 48MnV simultaneously, with density, the uniformity of improving steel.The production of also can be used for carbon knot round steel, carbon worker round steel, closing knot round steel, spring round steel, stainless round steel, high temperature alloy round steel.
The present invention dynamically gently depresses continuous casting and depresses two technologies of rolling mill practice greatly and combine to produce the 48MnV round steel, reaches loose compacting, crackle pressing, improves segregation, disperses to be mingled with, thereby improve the mechanical performance of steel.
The specific embodiment
A kind of production technology of 48MnV round steel of the present invention, this production technology is dynamically gently depressed continuous casting and is depressed rolling mill practice greatly and combine and produce the 48MnV round steel, and concrete steps are following:
1) adopts continuous casting dynamically gently to depress technology and obtain satisfactory 48MnV strand.
According to target be worth according to sampling result behind the vacuum breaker and finely tune, feed the C line after adding TiFe, fed and to have fed the Al line immediately; (according to N content, 100m=26ppm is 90% by the N rate of recovery, calculates feeding nitrogen line amount N to feed the MnN line then; 100m=0.037% Mn), stir the above feeding of 2min CaFe line: 80-120m, the back that finishes keeps the above feeding of the quiet 3min of stirring SFe line (feed quantity: 1m/t; According to molten steel actual [S], get two appearance more than the quiet 3min of stirring and analyze, continue to keep quiet stirring; According to etc. the appearance result continue fine setting, finely tune qualified after, get after the finished product appearance continuous casting on the bull ladle.The quiet process of stirring adds heat preserving agent 100-150kg according to temperature.
Connect and water stove: 1550～1560 ℃.Vacuum refining furnace, T liquid=1490 ℃, the best degree of superheat: 15-25 ℃; Continuous casting becomes the 320mm*480mm bloom.
2) at rolling line, to the strand heating, it is rolling that technology is depressed in employing greatly, rolling compression ratio >=6.0; Start rolling temperature is controlled at 1180-1050 ℃, and finishing temperature is controlled at 950-920 ℃.
At rolling line, mainly be to produce the 48MnV steel by steel rolling mill, in order to guarantee fully crystallization again, need enough rolling compression ratios.Therefore, rolling compression ratio >=6.0.Start rolling temperature is controlled at 1180-1050 ℃ (steel billet is in the blooming mill porch), desired value: 1100 ℃ (thermometric after the de-scaling).Finishing temperature is controlled at (product outlet thermometric) about 950-920 ℃.
3) product obtains the 48MnV round steel through slow cooling, finishing, ultrasonic eddy current inspection, packing, the warehouse-in of involving.
Technological process of the present invention is:
Examination → heating → technology is depressed in de-scaling → employing greatly to the continuous casting that supplementary material examination → batching → 100t electric furnace smelting → 100tLF refining → 100t vacuum refining furnace application of vacuum → calcium processing → quiet stirring → adopt is dynamically gently depressed → strand cooling check → blank that rolling → slow cooling → aligning → pickling → reconditioning → chamfered edge → inside and outside flaw detection → product inspection → packing indicates → weigh → put in storage.
The 48MnV chemical analysis:
Client's standard-required is seen table 1:
Table 1
Inner quality standard of the present invention is seen table 2:
See table 2
Other Composition Control are following, see table 3:
See table 3
| Ni≤ | Cu≤ | Sn≤ | Sb≤ | As≤ | Pb≤ | Bi≤ | [H]≤ | [O]≤ |
| 0.20 | 0.15 | 0.015 | 0.010 | 0.015 | 0.010 | 0.010 | 0.0003 | 0.0012 |
On Composition Control, C content is controlled at lower limit, Mn content is controlled at the middle upper limit; And add a certain amount of N and V, Ti in the steel, with raising intensity and toughness, in order to ensure oxygen content in steel≤20ppm; Hydrogen content≤2ppm, molten steel must carry out vacuum outgas at the VD stove to be handled.
Embodiment 1
Rolling number: B90196301, this rolling number is adopted the accumulative total drafts when continuous casting be 5mm, when rolling, adopts depressing greatly of two passages, draught per pass is 80mm.
Embodiment 2
Rolling number: B00187901, this rolling number is adopted the accumulative total drafts when continuous casting be 5mm, when rolling, adopts depressing greatly of two passages, draught per pass is 30mm.
Sample is through (1000 ± 5) ℃ heating 30min, and still air is cooled to room temperature, and then data all are superior to comparison sample, see table 4.
Table 4
| ReL，MPa | Rm，MPa | A，% | Z，% | Ballistic work AKU2 J | |
| Requirement | ≥500 | ≥800-920 | ≥13 | ≥25 | ≥32 |
| B90196301 | 625/640 | 915/910 | 14.0/15.0 | 41.5/40.5 | 45 |
| B00187901 | 615/635 | 925/915 | 15.5/15.5 | 40.1.0/42..0 | 47 |
| To changing appearance | 580/575 | 890/880 | 13.5 | 35 | 36 |
When smelting, the present invention adopted continuous casting blooms dynamically gently to depress technology; Adopted when rolling and depressed rolling mill practice greatly; This two technologies stack is used in the production of non-hardened and tempered steel 48MnV simultaneously,, thereby has improved the mechanical performance of steel with density, the uniformity of improving steel.
Claims (2)
1. the production technology of a 48MnV round steel is characterized in that: this production technology is dynamically gently depressed continuous casting and is depressed rolling mill practice greatly and combine and produce the 48MnV round steel, and concrete steps are following:
1) adopts continuous casting dynamically gently to depress technology and obtain satisfactory 48MnV strand; 48MnV strand composition by weight percentage is: C 0.45～0.51%, Si 0.17～0.37%, Mn 1.00～1.20%, V 0.06～0.11%, Ti 0.000～0.025, Cr 0.05～0.25%, Mo 0.00～0.06 %, Ni 0.00～0.20%, Cu 0.00～0.20%, N 0.080～0.0200%, P≤0.035%, S≤0.035%, O≤0.020%, Ceq 0.087～0.097, surplus be Fe and with inevitably be mingled with;
2) at rolling line, to the strand heating, it is rolling that technology is depressed in employing greatly, rolling compression ratio >=6.0; Start rolling temperature is controlled at 1180-1050 ℃, and finishing temperature is controlled at 950-920 ℃;
3) product obtains the 48MnV round steel through slow cooling, finishing, ultrasonic eddy current inspection, packing, the warehouse-in of involving.
2. the production technology of 48MnV round steel according to claim 1 is characterized in that: 48MnV strand composition by weight percentage is preferably: C 0.45～0.48%, Si 0.18～0.26%, Mn 1.06～1.15%, V 0.07～0.10%, Ti 0.013～0.025, Cr 0.10～0.16%, Mo≤0.05 %, Ni≤0.20%, Cu≤0.15%, N 0.0100～0.0120%, P≤0.025% S≤0.005 ~ 0.025%, O≤0.0012%, Ceq 0.088～0.096 surplus are Fe and and inevitably are mingled with.
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| CN103464711A (en) * | 2013-08-29 | 2013-12-25 | 鞍钢股份有限公司 | Method for solving internal segregation of bloom |
| CN104372263A (en) * | 2014-11-11 | 2015-02-25 | 南京钢铁股份有限公司 | Electric furnace production process of high-purity non-quenched and tempered steel for crankshaft |
| CN107377919A (en) * | 2017-07-20 | 2017-11-24 | 东北大学 | A kind of method for improving bearing steel strand central dense degree |
| CN107587076A (en) * | 2017-09-19 | 2018-01-16 | 北京科技大学 | The production method of bent axle major diameter ferrite+pearlite type non-hardened and tempered steel bar |
| CN107587073A (en) * | 2017-09-19 | 2018-01-16 | 北京科技大学 | A kind of titaniferous, the automobile engine crankshaft non-hardened and tempered steel of nitrogen and preparation method |
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| CN109158432A (en) * | 2018-09-05 | 2019-01-08 | 东北大学 | A kind of milling method promoting rear bloom consistency under convex roll-in |
| WO2019100881A1 (en) * | 2017-11-24 | 2019-05-31 | 南京钢铁股份有限公司 | Continuous casting production method for square billets of vanadium-containing nitrogen-containing micro-alloyed peritectic steel |
| CN110331338A (en) * | 2019-08-01 | 2019-10-15 | 江苏新合益机械有限公司 | Non-hardened and tempered steel and its manufacturing method |
| CN110508765A (en) * | 2019-09-09 | 2019-11-29 | 东北大学 | A kind of bloom continuous casting manufacturing method for being conducive to eliminate core defect |
| CN110527918A (en) * | 2019-09-30 | 2019-12-03 | 江苏新合益机械有限公司 | A kind of Novel hot-rolled round steel |
| CN110607485A (en) * | 2019-10-24 | 2019-12-24 | 宝钢特钢韶关有限公司 | Round steel with low magnetic mark rate, crankshaft forging and manufacturing method thereof |
| CN112813345A (en) * | 2020-12-28 | 2021-05-18 | 青海西钢特殊钢科技开发有限公司 | Non-quenched and tempered steel for cold machining engineering machinery hydraulic piston rod and preparation method |
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| CN113714306A (en) * | 2021-09-03 | 2021-11-30 | 江苏联峰实业有限公司 | Production method for improving density of low-rolling specific heat rolled round steel |
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| CN113714306A (en) * | 2021-09-03 | 2021-11-30 | 江苏联峰实业有限公司 | Production method for improving density of low-rolling specific heat rolled round steel |
| CN113862576A (en) * | 2021-09-30 | 2021-12-31 | 宝武杰富意特殊钢有限公司 | Non-quenched and tempered steel, crankshaft and production method thereof |
| CN113862576B (en) * | 2021-09-30 | 2022-12-02 | 宝武杰富意特殊钢有限公司 | Non-quenched and tempered steel, crankshaft and production method thereof |
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Application publication date: 20120229 |