CN105886939A - Steel for excavator slewing bearing and production process thereof - Google Patents
Steel for excavator slewing bearing and production process thereof Download PDFInfo
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- CN105886939A CN105886939A CN201610415334.4A CN201610415334A CN105886939A CN 105886939 A CN105886939 A CN 105886939A CN 201610415334 A CN201610415334 A CN 201610415334A CN 105886939 A CN105886939 A CN 105886939A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/35—Blowing from above and through the bath
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C2007/0093—Duplex process; Two stage processes
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses steel for an excavator slewing bearing and a production process thereof, and belongs to the technical field of slewing bearing materials. The steel is prepared from, by mass, 0.48-0.54% of C, 0.17-0.32% of Si, 0.70-0.85% of Mn, 0.04-0.18% of Cr, 0.20-0.24% of Mo, 0.022% or below of P, 0.022% or below of S, 0.30% or below of Ni, 0.018% or below of Cu, 0.10% of below of V and the balance Fe. The production process comprises converter smelting, LF refining, vacuum degassing (VD), continuous casting and steel billet examination and storage. The production process has the advantage that the strength and wear resistance of the steel for the slewing bearing can be effectively improved.
Description
Technical field
The present invention relates to pivoting support field of material technology, be specifically related to a kind of excavator revolution
Hold by steel and production technology thereof.
Background technology
Pivoting support is widely used at the crook of the arm of crane and excavator in reality industry,
It is known as being " joint of machine ".It is to need between two articles to make relative gyration, with
Time need again to bear the necessary important driving section of machinery of axial force, radial force, tilting moment
Part.The big frequency of excavator working strength is high and working environment is various, severe, and this just requires revolution
It is supported with higher wearability, preferable toughness and higher intensity.
In prior art, pivoting support can be because of the birth defect of material composition, technique with steel
Deoxygenation in design, desulfurization, dehydrogenation is not enough and it is right to meet commercial production application with rapid changepl. never-ending changes and improvements
The demand of quality of materials.As when in steel containing excess H time, along with the reduction H of temperature is at steel
In dissolubility reduce, if oversaturated H fail diffusion effusion, be just gathered in some defect
And form H2.Now the volume of H occurs drastically to expand, and metal local is torn by intrinsic pressure being enough to the most greatly
Split, and form crackle.Along with the increase of O content in steel, oxide inclusion probability is greatly increased,
Also the fatigue life of material can be reduced.In steel, N acts primarily as the effect of solution strengthening and precipitation strength,
But N causes timeliness and the blue shortness phenomenon of steel, too high the loose of steel and bubble also can be caused.And S
It is prone to generate FeS with Fe reaction, makes steel be prone to cracking when pressure processing, reduce material
Moulding.The deficiency of these technological designs makes pivoting support insufficient strength in the application, and is weak to
Mill, the life-span is short, and the replacement frequency ultimately resulting in pivoting support strengthens, and improves making of excavator
Use cost.
Summary of the invention
The invention provides a kind of excavator pivoting support steel and production technology thereof, can be effective
Improve intensity and the wearability of pivoting support steel.
For realizing object above, the present invention is achieved by the following technical programs:
A kind of excavator pivoting support steel, in raw material, each element and mass percent thereof are: C:
0.48-0.54%, Si:0.17-0.32%, Mn:0.70-0.85%, Cr:0.04-0.18%,
Mo:0.20-0.24%, P :≤0.022%, S :≤0.022%, Ni≤0.30%, Cu:
≤ 0.018%, V≤0.10%, surplus is Fe.
Further, as a preferred version of the present invention a kind of excavator pivoting support steel,
In raw material, each element and mass percent thereof are: C:0.50-0.52%, Si:0.18-0.30%,
Mn:0.72-0.83%, Cr:0.08-0.14%, Mo:0.20-0.22%, P :≤0.022%,
S :≤0.022%, Ni≤0.30%, Cu :≤0.018%, V≤0.10%, surplus is Fe.
Further, another as the present invention a kind of excavator pivoting support steel is the most square
Case, in raw material, each element and mass percent thereof are: C:0.50%, Si:0.18%, Mn:
0.72%, Cr:0.08%, Mo:0.20%, P:0.020%, S:0.018%, Ni:0.22%,
Cu:0.014%, V:0.08%, surplus is Fe.
Present invention also offers the production technology of a kind of excavator pivoting support steel, including following
Step:
(1) converter smelting: 1. charging: by molten iron, steel scrap, put into oxygen top and bottom complex blowing formula and turn
2. stove blows slag making: lower oxygen rifle, add slag charge, use three shower nozzle oxygen rifles agitation molten baths, hole, point
Fire blowing 14-20min, temperature control 1200 DEG C-1300 DEG C 3. deoxidation tap 4. deslagging；
(2) LF refine (refinement outside-furnace): 1. converter tapping: LF stove steel poured into by molten steel
2. line feeding in bag: adding flux, deoxidizer, slag charge and Mn, Cr modified metal raw material is 3.
Stirring refine: LF furnace bottom leads to argon, be energized the 4. white slag refine that heats up: uses
Al2O3-CaO-SiO2 slag system desulfurization, adds Ni, Mo, V, keeps reproducibility atmosphere,
5. stirring 20min wraps mouth and skims, and enters VD vacuum chamber；
(3) VD vacuum outgas: VD vacuum chamber P < 65Pa is set, carries out bag BOTTOM ARGON BLOWING simultaneously
Stirring, Argon speed is less than 250L/min；
(4) continuous casting: high-temperature molten steel is continuously cast in the copper mold with dummy bar head,
Move secondary cooling zone to and continue water-spraying control；
(5) steel billet warehouse-in.
Further, the production technology of described excavator pivoting support steel, converter smelting walks
In Zhou, in charge weight, molten iron proportioning is 80%-90%.
Further, the production technology of described excavator pivoting support steel, converter smelting walks
In Zhou, added flux be limestone, deoxidizer be the one in ferrosilicon, ferromanganese and aluminum or mixing.
Further, the production technology of described excavator pivoting support steel, converter smelting walks
In Zhou, the slag charge composition of interpolation is: limestone 20%-25%, Calx 30%-35%, dolomite
22%-26%, iron ore 20%-25%, slag charge divides multiple batches of addition.
Further, the production technology of described excavator pivoting support steel, LF refinement step
Middle basicity of slag is 2.8-3.3.
One excavator pivoting support steel of the present invention and production technology thereof, can effectively improve back
Turn intensity and the wearability of supporting steel.In modified raw metal, C, Si and Mn can show
Write improve the intensity of steel and it quenching degree and hardenability.The addition of Cr, Mo can significantly carry
The quenching degree of high material, can improve the hardness of steel simultaneously, anticorrosive, wearability and weatherability,
Improve the quenching and tempering stability action of steel, improve the quenching characteristics at steel welding seam, reduce
Hardening flaw, improves the impact flexibility of commissure.Ni Yu Fe presented in dissolving each other in steel
α phase or γ phase in, by refine α phase crystal grain, improve the cryogenic property of steel, particularly
Toughness.Al improves the non-oxidizability of steel, reduces gas content in steel, improve steel wearability and
Fatigue strength, is present in steel grade simultaneously as crystal grain thinning element, plays the low temperature properties improving steel
Can be with the effect of corrosion resisting property.
During oxygen top blown converter steel making, mainly by the mistake of high-temperature physics chemical reaction
Cheng Shixian carbon drop, intensification, dephosphorization and alloying, by add slag charge make Mn in molten steel, S,
The elements such as O form slag charge in oxidizing atmosphere, thus reduce the impurity content of molten steel.Additionally,
Slag charge divides multiple batches of addition to advantageously reduce the content of harmful element in molten steel, by LF refinement step
Middle basicity of slag is set to 2.8-3.3, is because basicity of slag on the basis of prior art and is set to
2.8-3.3, can make the distribution ratio of sulfur reach maximum, and beneficially S sloughs.White slag refine,
Vacuum outgas is all of value to the removal of H.
Material component of the present invention is reasonable in design, and technique is the most effective.Compared with prior art, originally
The beneficial effect of the invention is effectively to improve intensity and the wearability of pivoting support steel.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below will knot
Close embodiments of the invention, the technical scheme in the embodiment of the present invention is carried out clearly and completely
Describe.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creation
The every other embodiment obtained under property work premise, broadly falls into the scope of protection of the invention.
Below in conjunction with embodiment, the present invention is further illustrated.
Embodiment one:
A kind of excavator pivoting support steel, in raw material, each element and mass percent thereof are: C:
0.48%, Si:0.17%, Mn:0.70%, Cr:0.04%, Mo:0.20%, P:
0.014%, S:0.016%, Ni 0.20%, Cu:0.012%, V:0.06%, surplus
For Fe.
The production technology of a kind of excavator pivoting support steel, comprises the following steps:
(1) converter smelting: 1. charging: by the molten iron of proportioning 80%, the steel scrap of 20%, put into
2. oxygen top and bottom complex blowing formula converter blows slag making: lower oxygen rifle, point 3 addition slag charges, slag charge
Consist of limestone 20%, Calx 30%, dolomite 26%, iron ore 24%, use three holes
Shower nozzle oxygen rifle agitation molten bath, igniting blowing 14min, temperature controls 1200 DEG C of 3. deoxidation tappings:
Stop blowing, molten steel is transferred to 4. deslagging in LF stove ladle；
(2) LF refine: 1. converter tapping: molten steel is poured into 2. line feeding in LF stove ladle:
Adding limestone, ferrosilicon, ferromanganese and aluminum, slag charge and Mn, 3. Cr modified metal raw material stirs
Refine: LF furnace bottom leads to argon, energising heats up, 4. white slag refine: use Al2O3-CaO-SiO2
Slag system desulfurization, adds Ni, Mo, V, keeps reproducibility atmosphere, stirs 20min, 5. wraps
Mouth is skimmed, and enters VD vacuum chamber；
(3) VD vacuum outgas: arranging VD vacuum chamber P is 50Pa, carries out bag bottom blowing simultaneously
Argon stirs, and Argon speed is 200L/min；
(4) continuous casting: high-temperature molten steel is continuously cast in the copper mold with dummy bar head,
Move secondary cooling zone to and continue water-spraying control；
(5) steel billet warehouse-in.
Embodiment two:
A kind of excavator pivoting support steel, in raw material, each element and mass percent thereof are C:
0.54%, Si:0.32%, Mn:0.85%, Cr:0.18%, Mo:0.24%,
P:0.022%, S:0.022%, Ni 0.30%, Cu:0.018%, V 0.10%, surplus
For for Fe.
The production technology of a kind of excavator pivoting support steel, comprises the following steps:
(1) converter smelting: 1. charging: by the molten iron of proportioning 85%, the steel scrap of 15%, put into
2. oxygen top and bottom complex blowing formula converter blows slag making: lower oxygen rifle, point 3 addition slag charges, slag charge
Consist of limestone 25%, Calx 33%, dolomite 22%, iron ore 20%, use three holes
Shower nozzle oxygen rifle agitation molten bath, igniting blowing 16min, temperature controls 1250 DEG C of 3. deoxidation tappings:
Stop blowing, molten steel is transferred to 4. deslagging in LF stove ladle；
(2) LF refine: 1. converter tapping: molten steel is poured into 2. line feeding in LF stove ladle:
Adding limestone, ferrosilicon, ferromanganese and aluminum, slag charge and Mn, 3. Cr modified metal raw material stirs
Refine: LF furnace bottom leads to argon, energising heats up, 4. white slag refine: use Al2O3-CaO-SiO2
Slag system desulfurization, adds Ni, Mo, V, keeps reproducibility atmosphere, stirs 20min, 5. wraps
Mouth is skimmed, and enters VD vacuum chamber；
(3) VD vacuum outgas: arranging VD vacuum chamber P is 55Pa, carries out bag bottom blowing simultaneously
Argon stirs, and Argon speed is 200L/min；
(4) continuous casting: high-temperature molten steel is continuously cast in the copper mold with dummy bar head,
Move secondary cooling zone to and continue water-spraying control；
(5) steel billet warehouse-in.
Embodiment three:
A kind of excavator pivoting support steel, in raw material, each element and mass percent thereof are: C:
0.50%, Si:0.18%, Mn:0.72%, Cr:0.08%, Mo:0.20%,
P:0.018%, S:0.014%, Ni:0.22%, Cu:0.014%, V 0.08%,
Surplus is Fe.
The production technology of a kind of excavator pivoting support steel, comprises the following steps:
(1) converter smelting: 1. charging: by the molten iron of proportioning 87%, the steel scrap of 13%, put into
2. oxygen top and bottom complex blowing formula converter blows slag making: lower oxygen rifle, point 3 addition slag charges, slag charge
Consist of limestone 22%, Calx 31%, dolomite 22%, iron ore 25%, use three holes
Shower nozzle oxygen rifle agitation molten bath, igniting blowing 18min, temperature controls 1250 DEG C of 3. deoxidation tappings:
Stop blowing, molten steel is transferred to 4. deslagging in LF stove ladle；
(2) LF refine: 1. converter tapping: molten steel is poured into 2. line feeding in LF stove ladle:
Adding limestone, ferrosilicon, ferromanganese and aluminum, slag charge and Mn, 3. Cr modified metal raw material stirs
Refine: LF furnace bottom leads to argon, energising heats up, 4. white slag refine: use Al2O3-CaO-SiO2
Slag system desulfurization, adds Ni, Mo, V, keeps reproducibility atmosphere, stirs 20min, 5. wraps
Mouth is skimmed, and enters VD vacuum chamber；
(3) VD vacuum outgas: arranging VD vacuum chamber P is 55Pa, carries out bag bottom blowing simultaneously
Argon stirs, and Argon speed is 150L/min；
(4) continuous casting: high-temperature molten steel is continuously cast in the copper mold with dummy bar head,
Move secondary cooling zone to and continue water-spraying control；
(5) steel billet warehouse-in.
Embodiment four:
A kind of excavator pivoting support steel, in raw material, each element and mass percent thereof are: C:
0.52%, Si:0.30%, Mn:0.83%, Cr:0.14%, Mo:0.22%,
P:0.020%, S:0.018%, Ni 0.22%, Cu:0.014%, V 0.008%,
Surplus is Fe.
The production technology of a kind of excavator pivoting support steel, comprises the following steps:
(1) converter smelting: 1. charging: by the molten iron of proportioning 90%, the steel scrap of 10%, put into
2. oxygen top and bottom complex blowing formula converter blows slag making: lower oxygen rifle, point 3 addition slag charges, slag charge
Consist of limestone 20%, Calx 35%, dolomite 23%, iron ore 22%, use three holes
Shower nozzle oxygen rifle agitation molten bath, igniting blowing 20min, temperature controls 1300 DEG C of 3. deoxidation tappings:
Stop blowing, molten steel is transferred to 4. deslagging in LF stove ladle；
(2) LF refine: 1. converter tapping: molten steel is poured into 2. line feeding in LF stove ladle:
Adding limestone, ferrosilicon, ferromanganese and aluminum, slag charge and Mn, 3. Cr modified metal raw material stirs
Refine: LF furnace bottom leads to argon, energising heats up, 4. white slag refine: use Al2O3-CaO-SiO2
Slag system desulfurization, adds Ni, Mo, V, keeps reproducibility atmosphere, stirs 20min, 5. wraps
Mouth is skimmed, and enters VD vacuum chamber；
(3) VD vacuum outgas: VD vacuum chamber P < 65Pa is set, carries out bag BOTTOM ARGON BLOWING simultaneously
Stirring, Argon speed is 150L/min；
(4) continuous casting: high-temperature molten steel is continuously cast in the copper mold with dummy bar head,
Move secondary cooling zone to and continue water-spraying control；
(5) steel billet warehouse-in.
Above example only in order to technical scheme to be described, is not intended to limit；Although
With reference to previous embodiment, the present invention is described in detail, those of ordinary skill in the art
It is understood that the technical scheme described in foregoing embodiments still can be modified by it,
Or wherein portion of techniques feature is carried out equivalent；And these amendments or replacement, not
The essence making appropriate technical solution departs from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (8)
1. an excavator pivoting support steel, it is characterised in that each element and quality thereof in raw material
Percent is: C:0.48-0.54%, Si:0.17-0.32%, Mn:0.70-0.85%, Cr:
0.04-0.18%, Mo:0.20-0.24%, P :≤0.022%, S :≤0.022%, Ni≤0.30%,
Cu :≤0.018%, V≤0.10%, surplus is Fe.
2. excavator pivoting support steel as claimed in claim 1, it is characterised in that raw material
In each element and mass percent thereof be: C:0.50-0.52%, Si:0.18-0.30%, Mn:
0.72-0.83%, Cr:0.08-0.14%, Mo:0.20-0.22%, P :≤0.022%, S:
≤ 0.022%, Ni≤0.30%, Cu :≤0.018%, V≤0.10%, surplus is Fe.
3. excavator pivoting support steel as claimed in claim 1, it is characterised in that raw material
In each element and mass percent thereof be: C:0.50%, Si:0.18%, Mn:0.72%,
Cr:0.08%, Mo:0.20%, P:0.020%, S:0.018%, Ni:0.22%, Cu:
0.014%, V:0.08%, surplus is Fe.
4. the excavator pivoting support steel that a kind is prepared according to any one of claims 1 to 3
Production technology, it is characterised in that comprise the following steps:
(1) converter smelting: 1. charging: by molten iron, steel scrap, put into oxygen top and bottom complex blowing formula and turn
2. stove blows slag making: lower oxygen rifle, add slag charge, use three shower nozzle oxygen rifles agitation molten baths, hole, point
Fire blowing 14-20min, temperature control 1200 DEG C-1300 DEG C 3. deoxidation tap 4. deslagging；
(2) LF refine: 1. converter tapping: 2. line feeding in LF stove ladle poured into by molten steel: add
Entering flux, deoxidizer, slag charge and Mn, 3. Cr modified metal raw material stirs refine: LF furnace bottom
Logical argon, be energized the 4. white slag refine that heats up: uses Al2O3-CaO-SiO2Slag system desulfurization, then add
Enter Ni, Mo, V, keep reproducibility atmosphere, stirring 20min 5. to wrap mouth and skim, enter VD
Vacuum chamber；
(3) VD vacuum outgas: VD vacuum chamber P < 65Pa is set, carries out bag BOTTOM ARGON BLOWING simultaneously
Stirring, Argon speed is less than 250L/min；
(4) continuous casting: high-temperature molten steel is continuously cast in the copper mold with dummy bar head,
Move secondary cooling zone to and continue water-spraying control；
(5) steel billet warehouse-in.
5. the production technology of excavator pivoting support steel as claimed in claim 4, converter smelting
In step, in charge weight, molten iron proportioning is 80%-90%.
6. the production technology of excavator pivoting support steel as claimed in claim 4, converter smelting
In step, added flux is limestone, and deoxidizer is the one in ferrosilicon, ferromanganese and aluminum or mixed
Close.
7. the production technology of excavator pivoting support steel as claimed in claim 4, converter smelting
In step, the slag charge composition of interpolation is: limestone 20%-25%, Calx 30%-35%, white clouds
Stone 22%-26%, iron ore 20%-25%, slag charge divides multiple batches of addition.
8. the production technology of excavator pivoting support steel as claimed in claim 4, LF refine
In step, basicity of slag is 2.8-3.3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610415334.4A CN105886939A (en) | 2016-06-14 | 2016-06-14 | Steel for excavator slewing bearing and production process thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610415334.4A CN105886939A (en) | 2016-06-14 | 2016-06-14 | Steel for excavator slewing bearing and production process thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106222446A (en) * | 2016-08-25 | 2016-12-14 | 安徽丰源车业有限公司 | Alloy material supporting axle sleeve improving surface accuracy length in service life and preparation method thereof |
| CN109338041A (en) * | 2018-10-24 | 2019-02-15 | 河钢股份有限公司承德分公司 | A kind of lime stone is applied to the method for LF refining instead of calcium carbide |
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| CN101935811A (en) * | 2010-08-09 | 2011-01-05 | 江苏沙钢集团淮钢特钢有限公司 | Steel with high strength, low-temperature impact resistance and weatherability for wind-powered pivoting support and production process thereof |
| CN101974873A (en) * | 2010-09-13 | 2011-02-16 | 江苏宜鹏锻压机械制造有限公司 | Method for processing pivoting support ring rail of mining excavator |
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