CN106475542A - A kind of axle steel and its continuous cast method - Google Patents
A kind of axle steel and its continuous cast method Download PDFInfo
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- CN106475542A CN106475542A CN201611007631.1A CN201611007631A CN106475542A CN 106475542 A CN106475542 A CN 106475542A CN 201611007631 A CN201611007631 A CN 201611007631A CN 106475542 A CN106475542 A CN 106475542A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
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Abstract
The invention belongs to automobile steel technical field, and in particular to a kind of axle steel and its continuous cast method.The inventive method includes：A, cast using conticaster, Casting speed is 0.45m/min～0.65m/min, crystallizer and solidification end all adopt electromagnetic agitation；In b, guarantee casting process, the degree of superheat of Metal in Tundish is at 20 DEG C～30 DEG C；C, adopt the big Reduction Technology of solidification end, increase continuous casting billet solidifying end drafts；D, adopt dynamic secondary cooling control technology, it is ensured that strand process of catching a cold is uniform, stable；E, two cold employing back zones secondary cooling system cold by force, while improving intensity of cooling, specific water is 0.40kg/t steel～0.50kg/t steel；Strand aligning area surface temperature is 800 DEG C～900 DEG C.The continuous cast method of axle steel of the present invention, is remarkably improved strand consistency and homogeneity.
Description
Technical field
The invention belongs to automobile steel technical field, and in particular to a kind of axle steel and its continuous cast method.
Background technology
Axletree is the vitals of rail truck traveling, and its quality state is directly connected to the bearing capacity of vehicle and transport
Safety.As axle steel is medium carbon steel, during casting blank solidification, dendrite is more flourishing, and strand core easily forms dendrite
" bridging ", when the liquid surrounded below the bridge solidifies, prevents the supplement of liquid core Nei Qiao top molten steel, molten steel below such bridge
Process of setting produces loose shrinkage cavity just as a little During Ingot Solidification.Therefore how the cause of axle steel strand center is improved
Density is one of key technology of such steel grade of continuous casting.
Application No. " 201210503475.3 ", entitled " one kind improves extra-thick plate blank center segregation and center is dredged
The big Reduction Technology of pine ", discloses a kind of big Reduction Technology for improving extra-thick plate blank center segregation and center porosity, and its feature exists
In：The oil cylinder working-pressure of the 3 fan-shaped section hydraulic cylinders in Slab Solidification end is 1800～2500KN；According to steel grade coagulating property,
At 10～35 DEG C, between 0.6m/min～1.0m/min, two cold-zone specific waters of control are casting machine pulling rate control molten steel overheat
0.4～0.6L/kg, wherein a fan-shaped section enforcement are depressed greatly, and drafts is 5.0～12.0mm, other two fan-shaped section realities
Apply slighter compress, 2～3mm of drafts.This patented invention is set mainly for extra-thick plate blank, the improvement to extra-thick plate blank quality
Place, for the central dense degree proposition technical measures of square billet or axletree billet.
Application No. " 200810171563.1 ", entitled " a kind of axle steel and preparation method thereof ", the patent are public
A kind of axle steel is opened, wherein, the chemical composition of the axle steel is：On the basis of the axle steel gross weight, in terms of simple substance, C
0.47～0.54 weight %, Si, 0.2～0.4 weight %, Mn, 0.7～0.9 weight %, P≤0.02 weight %, S≤0.02 weight
0.02～0.06 weight %, Cr of amount 0.02～0.04 weight %, V of %, Al, 0.15～0.3 weight %, Ni≤0.2 weight %,
Cu≤0.2 weight %, H≤0.00025 weight %, O≤0.002 weight %, N≤0.007 weight %, balance of iron and impurity.
The invention provides a kind of preparation method of axle steel.This patented invention stresses to be axle steel Composition Control and smelting process,
Technical measures are not proposed for axle steel continuous casting and raising slab quality.
Application No. " 200810176429.0 ", entitled " axle steel continuous casting method ", the method are included molten steel
Crystallizer is poured into from tundish, the axle steel strand not solidified completely is formed, the axle steel casting then this not solidified completely
Base is pulled out from crystallizer with pulling rate V and sequentially passes through two cold-zones and air cooling zone, the axle steel strand for being solidified completely, its
In, the method also includes that use is successively set at least one of multiple slighter compress frames of air cooling zone and does not coagulate completely to described
Solid axle steel strand implement slighter compress slighter compress process, the axle steel strand not solidified completely is in the slighter compress mistake
Center solid rate fs in journey is maintained at 0.2～0.95.It is 0.2～0.95 axle steel not solidified completely to center solid rate
Strand carries out slighter compress, can eliminate or reduce because of strand and shrink the internal voids to be formed to prevent the molten steel of intergranular solute
Flow to strand central cross, and promote the molten steel of liquid phase center solute along throwing direction reverse flow, make solute element
Redistribute in molten steel, improve center segregation.It is thin to mitigate strand center that secondary patent of invention applies dynamic soft reduction technology
Pine and shrinkage cavity, but for the larger strand of section, slighter compress drafts is inadequate, so that extruding discharges solute segregation molten steel relatively
Few, it is impossible to complete seam central pipe, strand consistency improves limited.
Content of the invention
First technical problem to be solved by this invention is to provide a kind of company for improving axle steel steel Inner Quality of Billet
Casting method.
A kind of continuous cast method of axle steel of the present invention, comprises the following steps：
A, cast using conticaster, Casting speed is 0.45m/min～0.65m/min, crystallizer and solidification end
Electromagnetic agitation is all adopted；
In b, guarantee casting process, the degree of superheat of Metal in Tundish is at 20 DEG C～30 DEG C；
C, adopt the big Reduction Technology of solidification end, increase continuous casting billet solidifying end drafts；Feeding is solidified according to continuous casting billet
Principle, its drafts are drawn by (I) formula：
(Ⅰ)
Wherein, RiIt is the surface drafts of i-th withdrawal straightening machine, mm；
AiIt is casting blank solidification constricted cross section product, mm between i-th and the i-th -1 depressing position2；
XiIt is the strand width under i-th withdrawal straightening machine, mm；
ρlIt is molten steel density, kg/m3；
ηiIt is the pressure efficiency under i-th withdrawal straightening machine；
D, adopt dynamic secondary cooling control technology, it is ensured that strand process of catching a cold is uniform, stable；
E, two cold employing back zones secondary cooling system cold by force, at the same improve intensity of cooling, specific water be 0.40kg/t steel～
0.50kg/t steel；Strand aligning area surface temperature is 800 DEG C～900 DEG C.
Further, the continuous cast method of above-mentioned a kind of axle steel, wherein in a step, Casting speed is preferably 0.52m/min.
In a kind of continuous cast method of above-mentioned axle steel, wherein a step, crystallizer adopts 500A, 2.4Hz electromagnetic agitation.
In a kind of continuous cast method of above-mentioned axle steel, wherein a step, solidification end is using the electromagnetic agitation of 350A, 7Hz.
A kind of continuous cast method of above-mentioned axle steel, increases the concrete work of continuous casting billet solidifying end drafts wherein in step c
Skill parameter is：Soft reduction rate is 0.8～2.4mm/min, and pressure range length is 4.0m～8.0m, and pressure roller quantity is 4～7
Individual, single roller maximum reduction is 5.0mm～6.5mm；After the pressure of casting blank solidification end plain-barreled roll terminates, end is carried out using convex roller
The big pressure of convex roller, convex roller Soft reduction rate are 3～8mm/min, and pressure range length is 1.0m～2.0m, and drafts is
10.0mm～15.0mm.
Further, the continuous cast method of above-mentioned a kind of axle steel, increases continuous casting billet solidifying end drafts wherein in step c
Specific process parameter be preferably：Soft reduction rate is 1.5mm/min, and pressure range length is 7.7m, and pressure roller quantity is 6
Individual, single roller maximum reduction is 5.5mm；Convex roller drafts is 13mm.
A kind of continuous cast method of above-mentioned axle steel, wherein in Step d, dynamic secondary cooling control technology is specially：One area's water yield is accounted for
13～15%, 145～150L/ of intensity of cooling (min m2)；Two area's water yields account for 23～25%, 32～37L/ of intensity of cooling
(min·m2)；Three area's water yields account for 18～20%, 22～27L/ of intensity of cooling (min m2)；Four area's water yields account for 40～45%, cooling
15～17L/ of intensity (min m2).
Further, the continuous cast method of above-mentioned a kind of axle steel, wherein in step e, specific water is 0.45kg/t steel.
Second technical problem to be solved by this invention is to provide a kind of axle steel.
The continuous cast method of axle steel of the present invention, good have the advantages that simple to operate, using effect, it is remarkably improved strand cause
Density and homogeneity, the ratio during strand inside center is loose, center segregation, central pipe low power are graded, less than or equal to 1.0 grades
More than 99.0% is accounted for, the ratio more than or equal to 1.5 grades accounts for less than 1.0%.The perfect pressure of bloom continuous casting of the inventive method
Technique, it is ensured that the direct motion of bloom technique is carried out, and product quality is constantly improve, with obviously technology and economic benefit,
Estimated annual earnings are more than 5,000,000.
Specific embodiment
A kind of continuous cast method of axle steel of the present invention, comprises the following steps：
A, during continuous casting LZ50 axle steel, from molten steel is opened and is poured, it is desirable to ladle to tundish, tundish to knot
Brilliant device is cast using conticaster using whole plus protection casing protection cast, and stability contorting Casting speed is 0.45m/min
～0.65m/min, crystallizer and solidification end all adopt electromagnetic agitation；
B, pass through to process molten steel using refining equipments such as LF refining furnaces, control continuous casting steel pouring temperature is stable, it is ensured that even
During casting, the degree of superheat control of Metal in Tundish is between 20 DEG C～30 DEG C；
C, adopt the big Reduction Technology of solidification end, increase continuous casting billet solidifying end drafts, to extrude discharge solute segregation
Molten steel, while seam central pipe, improves strand central dense degree；Feeding principle is solidified according to continuous casting billet, its drafts is by (I)
Formula draws：
(Ⅰ)
Wherein, RiIt is the surface drafts of i-th withdrawal straightening machine, mm；
AiIt is casting blank solidification constricted cross section product, mm between i-th and the i-th -1 depressing position2；
XiIt is the strand width under i-th withdrawal straightening machine, mm；
ρlIt is molten steel density, kg/m3；
ηiIt is the pressure efficiency under i-th withdrawal straightening machine；
ΔAiCan be calculated according to solidification and heat transfer model；
ηiCan be calculated according to viscoelastic plasticity thermal influence zone；
In addition to pressure efficiency, all other are calculated the drafts for needing feeding for wick-containing drafts, i.e. wick-containing；
During test, the first stove is opened after pouring, and is started to put into operation under weight when wick-containing is to the 2nd pulling-straightening roller, and wherein pressure pattern is shown in
Shown in table 1 below：
1 U78CrV continuous casting billet drafts of table is distributed
D, adopt dynamic secondary cooling control technology, make continuous casting secondary cooling water not with pulling rate change and transient change, and
It is that basic water amount and strand " average pull rate " are associated, will mutually ties with current location strand " life-span " in each two cold-zone
Close, it is ensured that strand catches a cold process uniformly, stably；
E, two cold employing back zones secondary cooling system cold by force, at the same improve intensity of cooling, specific water be 0.40kg/t steel～
0.50kg/t steel；The surface temperature in strand aligning region is 800 DEG C～900 DEG C, it is ensured that good cc billet surface quality.
Further, the continuous cast method of above-mentioned a kind of axle steel, wherein in a step, Casting speed is preferably 0.52m/min.
In a kind of continuous cast method of above-mentioned axle steel, wherein a step, crystallizer adopts 500A, 2.4Hz electromagnetic agitation.
In a kind of continuous cast method of above-mentioned axle steel, wherein a step, solidification end is using the electromagnetic agitation of 350A, 7Hz.
A kind of continuous cast method of above-mentioned axle steel, increases the concrete work of continuous casting billet solidifying end drafts wherein in step c
Skill parameter is：Soft reduction rate is 0.8～2.4mm/min, and pressure range length is 4.0m～8.0m, and pressure roller quantity is 4～7
Individual, single roller maximum reduction is 5.0mm～6.5mm；After the pressure of casting blank solidification end plain-barreled roll terminates, end is carried out using convex roller
The big pressure of convex roller, convex roller Soft reduction rate are 3～8mm/min, and pressure range length is 1.0m～2.0m, and drafts is
10.0mm～15.0mm.
Further, the continuous cast method of above-mentioned a kind of axle steel, increases continuous casting billet solidifying end drafts wherein in step c
Specific process parameter be preferably：Soft reduction rate is 1.5mm/min, and pressure range length is 7.7m, and pressure roller quantity is 6
Individual, single roller maximum reduction is 5.5mm；Convex roller drafts is 13mm.
A kind of continuous cast method of above-mentioned axle steel, wherein in Step d, dynamic secondary cooling control technology is specially：One area's water yield is accounted for
13～15%, 145～150L/ of intensity of cooling (min m2)；Two area's water yields account for 23～25%, 32～37L/ of intensity of cooling
(min·m2)；Three area's water yields account for 18～20%, 22～27L/ of intensity of cooling (min m2)；Four area's water yields account for 40～45%, cooling
15～17L/ of intensity (min m2).
Further, the continuous cast method of above-mentioned a kind of axle steel, wherein in step e, specific water is 0.45kg/t steel.
The continuous cast method of axle steel of the present invention, mainly by stablize casting machine pulling rate, using tundish Prepared by Low Superheat Pouring,
The technical measures integrated uses such as two cold dynamic controls, the big press control of solidification end, improve the axle steel casting of bloom production
Base central dense degree.
The present invention also provides a kind of axle steel, and the axle steel is prepared by above-mentioned continuous cast method, its central dense
Degree is higher, and total quality is good, can meet the use requirement of axletree well.
The specific embodiment of the present invention is further described with reference to embodiment, therefore the present invention is not limited
System is among described scope of embodiments.
Embodiment 1
The embodiment be with the present invention continuous cast method improving LZ50 axle steel strand central dense degree, specially：
Continuous casting cross dimension is the LZ50 bloom of 360mm × 450mm, and casting machine pulling rate is 0.52m/min, and protects
Hold pulling rate stablize constant, the Metal in Tundish degree of superheat be 25 DEG C, casting process employs two cold dynamic controls, and Water Rate for Secondary Cooling Water is
0.45kg/tSteel；The big press control of solidification end is employed, Soft reduction rate is 1.5mm/min, pressure range length is 7.7m, pressure
Lower roll number is 6, overall reduction 31mm, 2# roller drafts 1.0mm, 3# roller drafts 1.5mm, 4# roller drafts 5.5mm, 5# roller
Drafts 5.0mm, 6# roller drafts 5.0mm, 7# roller drafts 13.0mm.
After being poured, macroscopic examination is carried out to bloom Inner Quality of Billet, inspection result shows, the horizontal low power of strand
Non-stop layer shrinkage cavity ratio is 100%, and center porosity defect is rated≤and 1.0 grades of ratios are 100%, center segregation≤0.5 grade
Ratio is 100%, changes steel rate for 0% because strand center porosity, center segregation effectively cause axle steel.
Embodiment 2
The embodiment be with the present invention continuous cast method improving U78CrV axle steel strand central dense degree, specifically
For：
Continuous casting cross dimension is the U78CrV bloom of 360mm × 450mm, and casting machine pulling rate is 0.45m/min, and
Pulling rate is kept to stablize constant, the Metal in Tundish degree of superheat is 20 DEG C, and casting process employs two cold dynamic controls, Water Rate for Secondary Cooling Water
For 0.40kg/tSteel；The big press control of solidification end is employed, Soft reduction rate is 1.0mm/min, pressure range length is 5.2m,
Pressure roller number is 5, overall reduction 27.5mm, 2# roller drafts 1.0mm, 3# roller drafts 2.5mm, 4# roller drafts 4.5mm,
5# roller drafts 3.5mm, 6# roller drafts 6.0mm, 7# roller drafts 10.0mm.
After being poured, macroscopic examination is carried out to bloom Inner Quality of Billet, inspection result shows, the horizontal low power of strand
Non-stop layer shrinkage cavity ratio is 100%, and center porosity defect is rated≤and 1.0 grades of ratios are 100%, center segregation≤0.5 grade
Ratio is 100%, changes steel rate for 0% because strand center porosity, center segregation effectively cause axle steel.
Embodiment 3
The embodiment be with the present invention continuous cast method improving 45# axle steel strand central dense degree, specially：
Continuous casting cross dimension is the 45# steel bloom of 360mm × 450mm, and casting machine pulling rate is 0.65m/min, and
Pulling rate is kept to stablize constant, the Metal in Tundish degree of superheat is 30 DEG C, and casting process employs two cold dynamic controls, Water Rate for Secondary Cooling Water
For 0.50kg/tSteel；The big press control of solidification end is employed, Soft reduction rate is 2.3mm/min, pressure range length is 4.5m,
Pressure roller number is 4, overall reduction 32mm, 2# roller drafts 1.0mm, 3# roller drafts 3.5mm, 4# roller drafts 3.5mm, 5#
Roller drafts 4.5mm, 6# roller drafts 4.5mm, 7# roller drafts 15.0mm.
After being poured, macroscopic examination is carried out to bloom Inner Quality of Billet, inspection result shows, the horizontal low power of strand
Non-stop layer shrinkage cavity ratio is 100%, and center porosity defect is rated≤and 1.0 grades of ratios are 100%, center segregation≤0.5 grade
Ratio is 100%, changes steel rate for 0% because strand center porosity, center segregation effectively cause axle steel.
Comparative example 1
The embodiment is that pressure mode adopts slighter compress, specially using common continuous cast method：
Continuous casting cross dimension is the LZ50 bloom of 360mm × 450mm, and casting machine pulling rate is 0.50m/min, and protects
Hold pulling rate stablize constant, the Metal in Tundish degree of superheat be 28 DEG C, casting process employs two cold dynamic controls, and Water Rate for Secondary Cooling Water is
0.45kg/t steel；The big press control of solidification end is employed, Soft reduction rate is 0.5mm/min, pressure range length is 7.7m, pressure
Lower roll number is 6, overall reduction 7.91mm, 2# roller drafts 1.05mm, 3# roller drafts 1.58mm, 4# roller drafts
1.77mm, 5# roller drafts 1.56mm, 6# roller drafts 1.21mm, 7# roller drafts 0.76mm.
After being poured, macroscopic examination is carried out to bloom Inner Quality of Billet, inspection result shows, the horizontal low power of strand
Non-stop layer shrinkage cavity ratio only 69%, center porosity defect is rated≤and 1.0 grades of ratios are 58%, the ratio of center segregation≤0.5 grade
Example is 64%, reaches 67% because strand center porosity, center segregation effectively cause axle steel and change steel rate.
Claims (9)
1. a kind of continuous cast method of axle steel, it is characterised in that comprise the following steps：
A, cast using conticaster, Casting speed is 0.45m/min～0.65m/min, crystallizer and solidification end are all adopted
Use electromagnetic agitation；
In b, guarantee casting process, the degree of superheat of Metal in Tundish is at 20 DEG C～30 DEG C；
C, adopt the big Reduction Technology of solidification end, increase continuous casting billet solidifying end drafts；Feeding principle is solidified according to continuous casting billet,
Its drafts is drawn by (I) formula：
(Ⅰ)
Wherein, RiIt is the surface drafts of i-th withdrawal straightening machine, mm；
AiIt is casting blank solidification constricted cross section product, mm between i-th and the i-th -1 depressing position2；
XiIt is the strand width under i-th withdrawal straightening machine, mm；
ρlIt is molten steel density, kg/m3；
ηiIt is the pressure efficiency under i-th withdrawal straightening machine；
D, adopt dynamic secondary cooling control technology, it is ensured that strand process of catching a cold is uniform, stable；
E, two cold employing back zones secondary cooling system cold by force, while improving intensity of cooling, specific water is 0.40kg/t steel～0.50kg/
T steel；Strand aligning area surface temperature is 800 DEG C～900 DEG C.
2. a kind of continuous cast method of axle steel according to claim 1, it is characterised in that：In a step, Casting speed is
0.52m/min.
3. the continuous cast method of a kind of axle steel according to claim 1 or claim 2, it is characterised in that：A step crystallization device is adopted
500A, 2.4Hz electromagnetic agitation.
4. the continuous cast method of a kind of axle steel according to claim 1 or claim 2, it is characterised in that：In a step, solidification end is adopted
The electromagnetic agitation of 350A, 7Hz.
5. a kind of continuous cast method of axle steel according to claim 1, it is characterised in that：Increase continuous casting billet solidification in step c
The specific process parameter of end drafts is：Soft reduction rate is 0.8～2.4mm/min, and pressure range length is 4.0m～8.0m,
Pressure roller quantity is 4～7, and single roller maximum reduction is 5.0mm～6.5mm；After the pressure of casting blank solidification end plain-barreled roll terminates,
Convex roller big pressure in end is carried out using convex roller, convex roller Soft reduction rate is 3～8mm/min, pressure range length is 1.0m
～2.0m, drafts are 10.0mm～15.0mm.
6. a kind of continuous cast method of axle steel according to claim 5, it is characterised in that：Soft reduction rate is 1.5mm/min, pressure
Lower siding-to-siding block length is 7.7m, and pressure roller quantity is 6, and single roller maximum reduction is 5.5mm；Convex roller drafts is 13mm.
7. a kind of continuous cast method of axle steel according to claim 1, it is characterised in that：Dynamic secondary cooling control skill in Step d
Art is specially：One area's water yield accounts for 13～15%, 145～150L/ of intensity of cooling (min m2)；Two area's water yields account for 23～25%, cold
But 32～37L/ of intensity (min m2)；Three area's water yields account for 18～20%, 22～27L/ of intensity of cooling (min m2)；Four area's water yields
Account for 40～45%, 15～17L/ of intensity of cooling (min m2).
8. a kind of continuous cast method of axle steel according to claim 1, it is characterised in that：In step e, specific water is 0.45kg/
T steel.
9. the axle steel that continuous cast method described in any one of claim 1～8 casts.
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| CN107081413A (en) * | 2017-04-01 | 2017-08-22 | 唐山钢铁集团有限责任公司 | The method for improving Steels for High Rise Buildings continuous casting billet central dense degree |
| CN107377919A (en) * | 2017-07-20 | 2017-11-24 | 东北大学 | A kind of method for improving bearing steel strand central dense degree |
| CN107671257A (en) * | 2017-10-12 | 2018-02-09 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of continuous casting billet production method for low compression ratio rolling |
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| CN108705051A (en) * | 2018-06-29 | 2018-10-26 | 攀钢集团攀枝花钢铁研究院有限公司 | 20CrMnTiH pinion steel bloom continuous casting production methods |
| CN108705050A (en) * | 2018-06-29 | 2018-10-26 | 攀钢集团攀枝花钢铁研究院有限公司 | The method that bloom continuous casting produces 34CrMo4 oxygen cylinder steel |
| CN108746525A (en) * | 2018-06-29 | 2018-11-06 | 攀钢集团攀枝花钢铁研究院有限公司 | Bloom consistency takes into account the continuous cast method of control with homogeneity |
| CN108772542A (en) * | 2018-06-29 | 2018-11-09 | 攀钢集团攀枝花钢铁研究院有限公司 | The method that bloom continuous casting produces 20CrMo pinion steels |
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| CN109550916A (en) * | 2017-09-25 | 2019-04-02 | 上海梅山钢铁股份有限公司 | A method of control high-carbon fine steel continuous casting steel billet interior tissue and crackle |
| CN112410650A (en) * | 2020-10-30 | 2021-02-26 | 建龙北满特殊钢有限责任公司 | Control method for improving low-power quality and segregation index of high-carbon chromium bearing steel |
| CN114130976A (en) * | 2021-12-09 | 2022-03-04 | 山西太钢不锈钢股份有限公司 | Method for improving center compactness of axle steel large round billet |
| CN115430812A (en) * | 2022-08-15 | 2022-12-06 | 中天钢铁集团有限公司 | Control method for medium-high carbon steel uniform structure for automobile constant-speed transmission shaft |
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| CN107377919A (en) * | 2017-07-20 | 2017-11-24 | 东北大学 | A kind of method for improving bearing steel strand central dense degree |
| CN109550916A (en) * | 2017-09-25 | 2019-04-02 | 上海梅山钢铁股份有限公司 | A method of control high-carbon fine steel continuous casting steel billet interior tissue and crackle |
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| CN108746525A (en) * | 2018-06-29 | 2018-11-06 | 攀钢集团攀枝花钢铁研究院有限公司 | Bloom consistency takes into account the continuous cast method of control with homogeneity |
| CN108705050A (en) * | 2018-06-29 | 2018-10-26 | 攀钢集团攀枝花钢铁研究院有限公司 | The method that bloom continuous casting produces 34CrMo4 oxygen cylinder steel |
| CN108705051A (en) * | 2018-06-29 | 2018-10-26 | 攀钢集团攀枝花钢铁研究院有限公司 | 20CrMnTiH pinion steel bloom continuous casting production methods |
| CN108772542A (en) * | 2018-06-29 | 2018-11-09 | 攀钢集团攀枝花钢铁研究院有限公司 | The method that bloom continuous casting produces 20CrMo pinion steels |
| CN108705055A (en) * | 2018-06-29 | 2018-10-26 | 攀钢集团攀枝花钢铁研究院有限公司 | M+F-EMS control method in bloom continuous casting |
| CN109396368A (en) * | 2018-12-21 | 2019-03-01 | 南京钢铁股份有限公司 | A method of improving high-carbon steel bloom continuous casting base internal soundness |
| CN109396368B (en) * | 2018-12-21 | 2021-01-26 | 南京钢铁股份有限公司 | Method for improving internal quality of high-carbon steel bloom continuous casting billet |
| CN112410650A (en) * | 2020-10-30 | 2021-02-26 | 建龙北满特殊钢有限责任公司 | Control method for improving low-power quality and segregation index of high-carbon chromium bearing steel |
| CN112410650B (en) * | 2020-10-30 | 2022-01-28 | 建龙北满特殊钢有限责任公司 | Control method for improving low-power quality and segregation index of high-carbon chromium bearing steel |
| CN114130976A (en) * | 2021-12-09 | 2022-03-04 | 山西太钢不锈钢股份有限公司 | Method for improving center compactness of axle steel large round billet |
| CN115430812A (en) * | 2022-08-15 | 2022-12-06 | 中天钢铁集团有限公司 | Control method for medium-high carbon steel uniform structure for automobile constant-speed transmission shaft |
| CN115430812B (en) * | 2022-08-15 | 2024-01-23 | 中天钢铁集团有限公司 | Control method for uniform structure of medium-high carbon steel for automobile constant-speed transmission shaft |
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