CN108977612A - The smelting process of high-strength weather-resistant bolt steel - Google Patents
The smelting process of high-strength weather-resistant bolt steel Download PDFInfo
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- CN108977612A CN108977612A CN201811137331.4A CN201811137331A CN108977612A CN 108977612 A CN108977612 A CN 108977612A CN 201811137331 A CN201811137331 A CN 201811137331A CN 108977612 A CN108977612 A CN 108977612A
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- 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
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- 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
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- 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
- C21C7/0006—Adding metallic additives
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- 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
- C21C7/0025—Adding carbon material
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- 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
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- 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
- C21C7/068—Decarburising
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- 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
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The present invention relates to technical field of ferrous metallurgy, specifically disclose a kind of smelting process of high-strength weather-resistant bolt steel.Present invention process by adjusting formula and optimizes deoxidation alloying process, keep molten steel alloying process more abundant, improve the recovery rate of alloy, by the ingredient for controlling refining slag, it is set to have good desulphurizing ability and good field trash adsorption capacity, to reduce the amount of inclusions of finished product molten steel, the cleanliness of molten steel is set to be largely increased, reduce influence of the field trash to the fatigue life of material, and the uniformity of steel product ingredient is improved as far as possible, control composition segregation, improve the intensity and corrosion resistance of bolt steel, refined synthetic slag in prior art is replaced using cheap bauxite, improve the mobility of slag system, promote the suction-operated of field trash, improve the cleanliness of molten steel, reduce comprehensive slag making cost, energy consumption is reduced under the premise of guaranteeing service performance, it reduces costs.
Description
Technical field
The present invention relates to technical field of ferrous metallurgy more particularly to a kind of smeltings of high-strength weather-resistant bolt steel
Method.
Background technique
It is high-strength bolt applied to the connection bolt on the facilities such as railway, highway steel structure bridge, due to being chronically at
In field environment, chemistry and electrochemical action easily occur for bolt surface and surrounding medium (steam, salinity etc.), to generate rust
Erosion.Especially steel bridge is generally across rivers, and long-term temperature and humidity are higher, and environment is more severe, and bolt is chronically at this ring
It is easier to rust corrosion in border, eventually leads to fracture or crackle, forms potential accident source.
Since steel inclusion is to the successional inhibition of steel matrix, so that steel are at rolling processing, warm
It is separated in reason and use process with field trash, gap is caused to generate, the indexs such as steel mechanics performance, corrosion resistance are produced
Raw negative influence.Particularly, due to the BIG SIZE BOLTS steel that bridge, highway, railway etc. use, it is chronically at special stress
In condition and harsh climate environment, the steel of bolt steel is required very high.However, the height that country's prior art produces at present
Strength bolts steel cleanness is lower, and inclusion content is relatively high, and non-metallic inclusion is mostly at 1.0 grades or more；In addition, steel
Microstructure and proportion not up to optimize, cause steel obdurability match it is bad, atmospheric corrosion resistance is poor, system
About application of the product in the production of 10.9 grade high-strength bolts.
Summary of the invention
Aiming at the problem that existing bolt strength and corrosion resistance need to be further increased, the present invention provides high-intensitive resistance to big
The smelting process of gas corrosion bolt steel.
In order to solve the above technical problems, technical solution provided in an embodiment of the present invention is:
A kind of smelting process of high-strength weather-resistant bolt steel, comprising the following steps:
(1) smelting molten steel: molten steel is blown, control endpoint carbon content≤0.20wt%, oxygen content≤800ppm, out
1600~1650 DEG C of steel temperature；
(2) deoxidation alloying: when tapping to the 1/8~3/20 of total tap, aluminium block is added, tapping is to the 3/ of total tap
When 16~1/4, Antaciron, carburant, high carbon ferromanganese, high carbon ferro-chrome and top slag are sequentially added；Above-mentioned all materials are being tapped
It is all added before to the 2/3 of total tap；
(3) LF refining: the molten steel that tapping finishes is hung to LF furnace refining station, bauxite, lime, calcium carbide and aluminum shot is added
Deoxidation slag making is carried out, controls the ingredient of refining slag are as follows: CaO 45~65%, SiO2≤ 10%, Al2O320~30%, MgO 3~
10%, FeO < 1%, MnO < 1%, R 4~15.
Referring now to the prior art, the smelting process of high-strength weather-resistant bolt steel provided by the invention passes through conjunction
Deoxidation of molten steel effect is strengthened in the adjustment of gold element, increases the intensity and atmospheric corrosion resistance of material；By controlling each material
Addition sequence keeps molten steel alloying process more abundant, by controlling the ingredient of refining slag, it is made to have suitable amount of liquid phase, good
Good desulphurizing ability and good field trash adsorption capacity improve finished steel to reduce the amount of inclusions of finished product molten steel
The degree of purity of liquid；By selecting the different addition opportunitys of alloying element, melts alloy sufficiently, be uniformly distributed, enhancing deoxidation is imitated
Fruit improves the recovery rate of alloy.By adjusting alloying element and the cleanliness of strict control molten steel, field trash is reduced to material
Fatigue life influence, and as far as possible improve steel product ingredient uniformity, control composition segregation, improve the strong of bolt steel
Degree and corrosion resistance.
Another improvement of the invention is the refined synthetic slag replaced in prior art using cheap bauxite, existing
The slag system that lime and fluorite form is generallyd use by technique, it is high that there are slag system fusing points, and agglomerating caking phenomenon is serious, refines the slag that arrives at a station
The problems such as condition difference and seriously corroded of resistance to material, overall cost is high, replaces existing refined synthetic slag using bauxite, can be more preferable
Ground promotes the dissolution of lime, and can reduce slag system fusing point, and clinker is liquid slag, can improve the mobility of slag system, promote to be mingled with
The suction-operated of object improves the cleanliness of molten steel, reduces comprehensive slag making cost, and refining overall cost reduces by 6.3 yuan/ton.
Preferably, in the deoxidation alloying process, the additional amount of the aluminium block is 1~2kg/t, the Antaciron
Additional amount is 2~5kg/t, and the additional amount of the carburant is 1~2kg/t, the additional amount of the high carbon ferromanganese is 8~
12.6kg/t, the additional amount of the high carbon ferro-chrome are 10.5~19kg/t.
Tapping to total tap 1/8~3/20 when aluminium block is added, molten steel is no slag at this time, can make aluminium ingot directly with
Steel contacts guarantee aluminium ingot rapid melting, reduce the scaling loss of aluminium, improve the utilization rate of aluminium, guarantee pre-deoxidation effect, and take off at this time
What oxygen generated is mingled with for bulky grain Al2O3, be conducive to the floating discharge of deoxidation products；Antaciron is first added and carries out deoxidation, then
Carburant is added, can avoid reaction between carbon and oxygen and be acutely likely to result in the appearance for turning over packet problem, add alloy after deoxidation, can subtract
The oxidation of few alloy, improves yield of alloy, is eventually adding top slag, can avoid top slag and alloy is rolled up together, make alloy melting
It is insufficient, cause yield of alloy to reduce, therefore, the specific addition sequence of each ingredient and additional amount can enhance deoxidation effect, together
Shi Tigao yield of alloy, reduces cost.
Preferably, in the deoxidation alloying process, the top slag is lime and bauxite；The additional amount of the lime is
3~4.5kg/t, the additional amount of the bauxite are 3.5~4.5kg/t.
Preferably, the content of aluminum oxide is 80% in the bauxite.
By being 3~4.5kg/t by the additional amount control of lime, the additional amount control of bauxite is 3.5~4.5kg/t,
Al in slag system can be improved2O3Content, and lime and the bauxite amount of being preferably added can make bauxite advantageously promote lime molten
Solution makes to improve the mobility of slag system in slag system without containing unmelted lime, and combine it is specific be added bauxite and lime plus
Enter opportunity, better desulfurization effect can be obtained.
Preferably, in the LF process, 0.4~1.5kg/t of additional amount of the bauxite, the additional amount of the lime is
0.5~2kg/t, the calcium carbide additional amount be 0.3~1.0Kg/t, 0.05~0.2kg/t of additional amount of the aluminum shot.
Preferably, in the LF process, the temperature of refining process is 1630~1680 DEG C, and refining time is 30~45 points
Clock.
Preferred refining time and refining temperature can reduce the field trash in molten steel, improve the recovery rate of alloy.
Preferably, in step (3), in the RH furnace refining procedure, vacuum degree is 67~266Pa, when vacuum cycle is handled
Between be 15~25 minutes, RH circulation time is 25~40 minutes, and vacuum processing, which finishes, carries out Calcium treatment and soft blow, controls Ca content
≤ 50ppm, soft blow time are 10~25 minutes.
Preferred RH furnace refining procedure, can with further degassing removal of inclusions, lesser field trash also can agglomeration,
Subsequent secondary soft blow, control time are 10~25 minutes, can remove the field trash that this part is grown up, further increase cleaning
Degree.
Preferably, in the RH process, the Calcium treatment is by the way of feeding silicon-calcium wire, 150~300m/ of feeding wire speed
Min, 150~300m of line feeding amount.
Field trash can be made to deformation processing of inclusion, preferred feeding wire speed and line feeding amount by way of feeding silicon-calcium wire
It sufficiently floats, improves Molten Steel Cleanliness.
Preferably, the chemical component of high-strength weather-resistant bolt steel are as follows: C 0.28~0.40%, Si 0.15~
0.30%, Mn 0.60~0.90%, P≤0.025%, S≤0.020%, Cr 0.60~1.00%, Ni 0.20~0.50%,
Cu 0.20~0.50%, Ti 0.005~0.050%；Surplus is Fe and inevitable impurity.
It is furthermore preferred that the chemical component of high-strength weather-resistant bolt steel are as follows: C 0.32~0.38%, Si 0.15
~0.30%, Mn 0.60~0.90%, P≤0.008%, S≤0.008%, Cr 0.60~1.00%, Ni 0.30~
0.40%, Cu 0.20~0.50%, Ti 0.005~0.050%；Surplus is Fe and inevitable impurity.
In the ingredient of high-strength weather-resistant bolt steel of the present invention, C, Cr, Mn element is added, improves the intensity of material
And harden ability；The content of impurity element P, S are reduced, Ti element is added, reduces cyrystal boundary segregation, improves the black brittleness of material and resistance to
Delayed fracture property, Ti, which is added, can also generate dispersed and tiny carboritride, to refine Ovshinsky crystal grain, in the intensity for improving steel
While, moreover it is possible to the toughness of steel is improved, the carboritride of formation can also inhibit the diffusion of hydrogen and keep hydrogen equal as the trap of hydrogen
Even distribution；Add the alloying elements such as Cu, Ni, Cr, be formed on its surface passivating film, reduces the invasion of hydrogen, prevent hydrogen induced cracking
It generates, while can also effectively improve weather-resistance, in addition, these elements also have the work for strengthening matrix
With；Si element is added, cooperation Cu, Cr improve the weatherability of steel.Above-mentioned each ingredient with special ratios phase interworking and, so that material is full
While the mechanical property requirements that sufficient bolt uses, moreover it is possible to the performance of atmospheric corrosion resistance with higher.
Preferably, in smelting molten steel process, nickel plate and copper plate is added in converter together with steel scrap and smelted.
Preferably, in the smelting molten steel process, the additional amount of the nickel plate is 2~2.5kg/t, and the copper plate adds
Entering amount is 2~5.5kg/t.
Cu, Ni alloy and high-quality steel scrap are added in converter together, can avoid subsequent causing LF since alloy plate suqare is larger
Difficulty is added, melts insufficient problem so as to cause alloy, and be not in what converter aoxidized since the alloy is not oxidizable
Problem, so that the recovery rate of alloy can be improved.
Preferably, in LF refining process, ferro-titanium is added after finishing in slag making.
Preferably, in the LF process, the additional amount of the ferrotianium is 0.1~0.9kg/t.
The bolt steel of mentioned component uses smelting process of the invention, the high-strength weather-resistant bolt steel of preparation
Microstructure be made of 40~70% ferrite and 30~60% pearlite, fineness of grain >=5 grade, tensile strength is reachable
700~850MPa, 550~650MPa of yield strength, 1/3 cold upsetting is qualified, index >=6.5 corrosion resistance I, the contraction percentage of area
Up to 42~60%, there is good cold-forming property, can satisfy downstream user production 10.9 grade high-strength bolt of large scale
Requirement.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
In order to better illustrate the present invention, it is illustrated below by embodiment is further.
Embodiment 1
The embodiment of the present invention provides a kind of high-strength weather-resistant bolt steel, chemical component are as follows:
C 0.28%, Si 0.20%, Mn 0.70%, P 0.01%, S 0.020%, Cr 1.00%, Ni 0.20%,
Cu 0.40%, Ti 0.020%, surplus are Fe and inevitable impurity.
The smelting step of above-mentioned high-strength weather-resistant bolt steel is as follows:
(1) smelting molten steel: carrying out desulfurization process for molten iron, then takes off Slag treatment to molten iron surface, obtain sulfur content≤
The low-sulfur molten iron, high-quality steel scrap are transferred in top and bottom combined blown converter by the low-sulfur molten iron of 0.025wt%, and to the low-sulfur iron
Nickel plate 2kg/t and copper plate 5.5kg/t is added in water to blow, control endpoint carbon content≤0.20wt%, oxygen content≤
800ppm, 1600 DEG C of tapping temperature；
(2) deoxidation alloying: converter tapping use slide plate pushing off the slag, tap to total tap 1/8~3/20 when, be added aluminium
Block 2kg/t, tap to total tap 3/16~1/4 when, sequentially add carburant 2kg/t, Antaciron 2kg/t, high-carbon manganese
Iron 10kg/t, high carbon ferro-chrome 19kg/t, bauxite 0.5kg/t, lime 5kg/t；Above-mentioned all materials arrive total tap in tapping
2/3 before all add；LF refining: the molten steel that tapping finishes is hung to LF furnace
(3) station is refined, the molten steel that tapping finishes is hung to LF furnace refining station, bauxite 0.4kg/t, lime is added
0.5kg/t, calcium carbide 1Kg/t, aluminum shot 0.5kg/t carry out deoxidation slag making, control the ingredient of refining slag are as follows: CaO 45~65%,
SiO2≤ 10%, Al2O320~30%, MgO 3~10%, FeO < 1%, MnO < 1%, R 4~15, slag making finishes addition titanium
Ferroalloy 0.9kg/t；The temperature of refining process is 1630 DEG C, and refining time is 45 minutes；
(4) RH furnace refines: molten steel being hung to RH furnace, forvacuum simultaneously carries out oxygen blast pressure Decarburization Operation, forces in oxygen blast
After carbonization treatment, vacuumize process, vacuum degree 67Pa, the vacuum cycle processing time is 15 minutes, and RH circulation time is
25 minutes, silicon-calcium wire is then fed with the speed of 150m/min, then line feeding amount 150m carries out soft blow, the soft blow time is
10min。
The non-metallic inclusion of the high-strength weather-resistant bolt steel prepared by embodiment 1 is graded according to GB/
T10561-2005, the results are shown in Table 1.
Table 1
Embodiment 2
The embodiment of the present invention provides a kind of high-strength weather-resistant cold-forging steel, chemical component are as follows:
C 0.35%, Si 0.15%, Mn 0.90%, P 0.025%, S 0.008%, Cr 0.60%, Ni 0.30%,
Cu 0.20%, Ti 0.050%, surplus are Fe and inevitable impurity.
The smelting step of above-mentioned high-strength weather-resistant bolt steel is as follows:
(1) smelting molten steel: carrying out desulfurization process for molten iron, then takes off Slag treatment to molten iron surface, obtain sulfur content≤
The low-sulfur molten iron, high-quality steel scrap are transferred in top and bottom combined blown converter by the low-sulfur molten iron of 0.025wt%, and to the low-sulfur iron
Nickel plate 2.5kg/t and copper plate 2kg/t is added in water to blow, control endpoint carbon content≤0.20wt%, oxygen content≤
800ppm, 1650 DEG C of tapping temperature；
(2) deoxidation alloying: converter tapping use slide plate pushing off the slag, tap to total tap 1/8~3/20 when, be added aluminium
Block 1.5kg/t, tap to total tap 3/16~1/4 when, sequentially add carburant 1kg/t, Antaciron 3.5kg/t, height
Carbon ferromanganese 12.6kg/t, high carbon ferro-chrome 10.5kg/t, bauxite 1.2kg/t, lime 6kg/t；Above-mentioned all materials are arrived in tapping
It is all added before the 2/3 of total tap；
(3) LF refining: the molten steel that tapping finishes is hung to LF furnace refining station, bauxite 0.8kg/t, lime is added
1.5kg/t, calcium carbide 0.3Kg/t, aluminum shot 1.3kg/t carry out deoxidation slag making, control the ingredient of refining slag are as follows: CaO 45~65%,
SiO2≤ 10%, Al2O320~30%, MgO 3~10%, FeO < 1%, MnO < 1%, R 4~15, slag making finishes addition titanium
Ferroalloy 0.1kg/t；The temperature of refining process is 1680 DEG C, and refining time is 30 minutes；
(4) RH furnace refines: molten steel being hung to RH furnace, forvacuum simultaneously carries out oxygen blast pressure Decarburization Operation, forces in oxygen blast
After carbonization treatment, vacuumize process, vacuum degree 150Pa, the vacuum cycle processing time is 20 minutes, and RH circulation time is
35 minutes, silicon-calcium wire is then fed with the speed of 230m/min, then line feeding amount 300m carries out soft blow, the soft blow time is
25min。
The non-metallic inclusion of the high-strength weather-resistant bolt steel prepared by embodiment 2 is graded according to GB/
T10561-2005, the results are shown in Table 2.
Table 2
Embodiment 3
The embodiment of the present invention provides a kind of high-strength weather-resistant cold-forging steel, chemical component are as follows:
C 0.40%, Si 0.30%, Mn 0.60%, P 0.006%, S 0.002%, Cr 0.80%, Ni 0.50%,
Cu 0.50%, Ti 0.005%, surplus are Fe and inevitable impurity.
The smelting step of above-mentioned high-strength weather-resistant bolt steel is as follows:
(1) smelting molten steel: carrying out desulfurization process for molten iron, then takes off Slag treatment to molten iron surface, obtain sulfur content≤
The low-sulfur molten iron, high-quality steel scrap are transferred in top and bottom combined blown converter by the low-sulfur molten iron of 0.025wt%, and to the low-sulfur iron
Nickel plate 2.2kg/t and copper plate 3.5kg/t is added in water to blow, control endpoint carbon content≤0.20wt%, oxygen content≤
800ppm, 1620 DEG C of tapping temperature；
(2) deoxidation alloying: converter tapping use slide plate pushing off the slag, tap to total tap 1/8~3/20 when, be added aluminium
Block 1kg/t, tap to total tap 3/16~1/4 when, sequentially add carburant 1.5kg/t, Antaciron 5kg/t, high-carbon
Manganese iron 8kg/t, high carbon ferro-chrome 16.5kg/t, bauxite 2kg/t, lime 7kg/t；Above-mentioned all materials arrive total tap in tapping
2/3 before all add；
(3) LF refining: the molten steel that tapping finishes is hung to LF furnace refining station, bauxite 1.5kg/t, lime 2kg/ is added
T, calcium carbide 0.6Kg/t, aluminum shot 1.0kg/t carry out deoxidation slag making, control the ingredient of refining slag are as follows: CaO 45~65%, SiO2≤
10%, Al2O320~30%, MgO 3~10%, FeO < 1%, MnO < 1%, R 4~15, slag making finishes addition ferro-titanium
0.6kg/t；The temperature of refining process is 1650 DEG C, and refining time is 38 minutes；
(4) RH furnace refines: molten steel being hung to RH furnace, forvacuum simultaneously carries out oxygen blast pressure Decarburization Operation, forces in oxygen blast
After carbonization treatment, vacuumize process, vacuum degree 266Pa, the vacuum cycle processing time is 25 minutes, and RH circulation time is
40 minutes, silicon-calcium wire is then fed with the speed of 300m/min, then line feeding amount 250m carries out soft blow, the soft blow time is
20min。
The non-metallic inclusion of the high-strength weather-resistant bolt steel prepared by embodiment 3 is graded according to GB/
T10561-2005 meets the regulation of table 1.
Table 1
Comparative example 1
The difference of this comparative example and embodiment 3 is the addition sequence of each substance in 3 deoxidation alloying process of embodiment
Adjustment are as follows: aluminium block → carburant → ferrosilicon → ferrochrome → manganese iron → bauxite, lime.
The non-metallic inclusion of the bolt steel prepared by comparative example 1 is graded according to GB/T10561-2005, as a result such as table 4
It is shown.
Table 4
The recovery rate that the recovery rate of Mn is 87.5%, Cr in this comparative example is 87.6%.
In conclusion present invention process by adjusting formula and optimizes deoxidation alloying process, Mn's
Recovery rate by original 80% or so be increased to the recovery rate of 96% or more, Cr by original 85% or so be increased to 95% with
On, and Ti recovery rate is stablized, steel inclusion grading is respectively less than 1.0 grades, and the cleanliness of molten steel is made to be largely increased, and reduces folder
Influence of the sundries to the fatigue life of material, and the uniformity of steel product ingredient is improved as far as possible, control composition segregation improves spiral shell
The intensity and corrosion resistance of bolt steel reduce energy consumption under the premise of guaranteeing service performance, reduce costs.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modification, equivalent replacement or improvement etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (10)
1. a kind of smelting process of high-strength weather-resistant bolt steel, including smelting molten steel, deoxidation alloying, LF refining and
RH refining, which is characterized in that
(1) smelting molten steel: molten steel is blown, and controls endpoint carbon content≤0.20wt%, oxygen content≤800ppm, tapping temperature
1600~1650 DEG C of degree；
(2) deoxidation alloying: tap to total tap 1/8~3/20 when, be added aluminium block, tap to total tap 3/16~
When 1/4, Antaciron, carburant, high carbon ferromanganese, high carbon ferro-chrome and top slag are sequentially added；Above-mentioned all materials are in tapping to always
It is all added before the 2/3 of tap；
(3) LF refining: the molten steel that tapping finishes is hung to LF furnace refining station, bauxite, lime, calcium carbide and aluminum shot is added and carries out
Deoxidation slag making controls the ingredient of refining slag are as follows: CaO 45~65%, SiO2≤ 10%, Al2O320~30%, MgO 3~
10%, FeO < 1%, MnO < 1%, R 4~15.
2. the smelting process of high-strength weather-resistant bolt steel as described in claim 1, which is characterized in that the deoxidation
In alloying step, the additional amount of the aluminium block is 1~2kg/t, and the additional amount of the Antaciron is 2~5kg/t, the increasing
The additional amount of carbon agent is 1~2kg/t, and the additional amount of the high carbon ferromanganese is 8~12.6kg/t, the additional amount of the high carbon ferro-chrome
For 10.5~19kg/t.
3. the smelting process of high-strength weather-resistant bolt steel as claimed in claim 1 or 2, which is characterized in that described
In deoxidation alloying process, the top slag is lime and bauxite；The additional amount of the lime is 5~7kg/t, the bauxite
Additional amount be 0.5~2kg/t.
4. the smelting process of high-strength weather-resistant bolt steel as described in claim 1, which is characterized in that the LF work
In sequence, 0.4~1.5kg/t of additional amount of the bauxite, the additional amount of the lime is 0.5~2kg/t, and the calcium carbide adds
Entering amount is 0.3~1.0Kg/t, 0.05~0.2kg/t of additional amount of the aluminum shot.
5. the smelting process of high-strength weather-resistant bolt steel as described in claim 1, which is characterized in that the LF work
In sequence, the temperature of refining process is 1630~1680 DEG C, and refining time is 30~45 minutes.
6. the smelting process of high-strength weather-resistant bolt steel as described in claim 1, which is characterized in that the RH furnace
In refining procedure, vacuum degree is 67~266Pa, and the vacuum cycle processing time is 15~25 minutes, and RH circulation time is 25~40
Minute, vacuum processing, which finishes, carries out Calcium treatment and soft blow, controls Ca content≤50ppm, and the soft blow time is 10~25 minutes.
7. the smelting process of high-strength weather-resistant bolt steel as described in claim 1, which is characterized in that the RH work
In sequence, the Calcium treatment is by the way of feeding silicon-calcium wire, 150~300m/min of feeding wire speed, 150~300m of line feeding amount.
8. the smelting process of high-strength weather-resistant bolt steel as described in claim 1, which is characterized in that high-intensitive resistance to
The chemical component of atmospheric corrosion bolt steel are as follows: C 0.28~0.40%, Si 0.15~0.30%, Mn 0.60~0.90%, P
≤ 0.025%, S≤0.020%, Cr 0.60~1.00%, Ni 0.20~0.50%, Cu 0.20~0.50%, Ti 0.005
~0.050%；Surplus is Fe and inevitable impurity.
9. the smelting process of high-strength weather-resistant bolt steel as claimed in claim 8, which is characterized in that smelting molten steel
In process, nickel plate and copper plate are added in converter together with steel scrap and smelted.
10. the smelting process of high-strength weather-resistant bolt steel as claimed in claim 8, which is characterized in that LF refining
In process, ferro-titanium is added after finishing in slag making.
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