CN108220769A - One kind plus zirconium high-carbon clean steel intermediate frequency furnace smelt preparation method - Google Patents
One kind plus zirconium high-carbon clean steel intermediate frequency furnace smelt preparation method Download PDFInfo
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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
- 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
- C22C38/04—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
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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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
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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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
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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Abstract
The invention belongs to special steel and its technical field of smelting, are related to a kind of plus zirconium high-carbon clean steel intermediate frequency furnace and smelt preparation method.By mass percentage, described plus zirconium high-carbon clean steel consists of the following compositions：C0.67~0.75%, Si 0.15~0.37%, Mn 0.30~0.80%, P≤0.012%, S≤0.006%, Cr 0.20~0.50%, Mo≤0.30%, V≤0.30%, Zr 0.002~0.100%, surplus are Fe and inevitable impurity.Preparation method includes：Intermediate frequency furnace is smelted, the refining of LF stoves, continuous casting processing.Product mechanical performance prepared by the present invention has than existing product to be increased substantially, tensile strength Rm >=1400MPa；Yield strength R0.2 >=1300MPa, plank are used in sintered saw bits motherboard, and generation plastic deformation damage is small, improves its service life, the steel production cost is low.
Description
Technical field
The invention belongs to special steel and its technical field of smelting, are related to a kind of plus zirconium high-carbon clean steel intermediate frequency furnace and smelt system
Preparation Method.
Background technology
At present, it when with steel plate sintered saw bits when planks, needs to be heated to certain temperature (750 DEG C of left sides in process
It is right), use environment is severe, and material will bear to hale stretch and fatigue rupture.At present, the carbon steel steel plate such as used, then be sintered
The plank gone out is also easy to produce plastic deformation, and service life is short；It is with high costs if using high-strength alloy steel plate.High-quality carbon structure
Although steel 70# steel is suitable for the hot-working under high temperature (750 DEG C or so), harmful element, the content of field trash are equal in its ingredient
It is higher, limited mechanical properties.
Therefore, it is necessary to develop a kind of high-carbon, microalloying, harmful element and inclusion content is low, product mechanical performance
By force, the relatively low high intensity carbon clean steel of cost, applied to the hot-working under high temperature.
Invention content
The present invention provides a kind of plus zirconium high-carbon clean steel intermediate frequency furnace and smelts preparation method.
The present invention is achieved by the following technical solutions：
One kind plus zirconium high-carbon clean steel intermediate frequency furnace smelt preparation method, and by mass percentage, described plus zirconium high-carbon is pure
Net steel consists of the following compositions：C 0.67~0.75%, Si 0.15~0.37%, Mn 0.30~0.80%, P≤0.012%,
S≤0.006%, Cr 0.20~0.50%, Mo≤0.30%, V≤0.30%, Zr0.002~0.100%, surplus is for Fe and not
Evitable impurity；
The preparation method includes the following steps：
Intermediate frequency furnace smelting step：
Slag former and raw materials for metallurgy are added in the intermediate frequency furnace, carries out melt processed；It is warming up to the first tapping again
Temperature, tapping obtain smelting molten steel；
LF stove refinement steps：
The smelting molten steel is sent into LF stoves and carries out refining treatment, in the refining treatment later stage sampling analysis and by molten steel
Temperature adjustment is to the second tapping temperature, then adds in Mn sources, Si sources, V sources, Zr sources into the LF stoves and wanted with adjusting molten steel component to design
It asks, obtains refining liquid steel；
Continuous casting processing step：
The refining liquid steel is subjected to continuous casting processing, obtains described plus zirconium high-carbon clean steel.
In a preferred embodiment, in the intermediate frequency furnace smelting step, the raw materials for metallurgy is ingot iron, increases
Carbon agent, Mn sources, Si sources, Cr sources, Mo sources；Preferably, the Mn sources for electrolysis Mn, the Si sources be Si-Fe alloys, the Cr sources
For Cr simple substance, the Mo sources are Mo simple substance；The V sources are V-Fe alloys, and the Zr sources are Zr-Fe alloys.
In a preferred embodiment, in the intermediate frequency furnace smelting step, the dosage of the carburant is the work
The 0.7-0.8% of industry pure iron quality.
In a preferred embodiment, in the intermediate frequency furnace smelting step, the matter of the slag former and raw materials for metallurgy
Amount is than being (5-10)：1000.
In a preferred embodiment, in the intermediate frequency furnace smelting step, the slag former is active quick lime, firefly
The combination of one or more of stone, expanded perlite.
In a preferred embodiment, in the intermediate frequency furnace smelting step, first tapping temperature is 1620-
1640℃。
In a preferred embodiment, in the LF stoves refinement step, the temperature of the refining treatment is 1600-1640
DEG C, the time is no less than 30min, preferably 40-50min；Second tapping temperature is 1620-1660 DEG C.
In a preferred embodiment, the preparation method further includes：It is described in the intermediate frequency furnace smelting step
Slag former is layed in the intermediate frequency furnace furnace bottom.
In a preferred embodiment, described plus zirconium high-carbon clean steel consists of the following compositions：C 0.67~0.75%, Si
0.15~0.3%, Mn 0.3~0.6%, P≤0.012%, S≤0.006%, Cr 0.25~0.40%, Mo0.010-
0.025%, V 0.20-0.30%, Zr 0.002~0.01%, surplus are Fe and inevitable impurity.
In a preferred embodiment, described plus zirconium high-carbon clean steel tensile strength Rm >=1400MPa, yield strength
R0.2≥1300MPa。
Compared with prior art, the present invention has the advantages that：
1st, on the basis of the carbon constructional quality steel 70# steel for preparing of the present invention, hazardous elements S is further reduced, P, O, N contain
It measures, reduction inclusion content, cleaning molten steel, is greatly improved the mechanical performance of steel.
2nd, product mechanical performance prepared by the present invention has than 70# steel, high-carbon clean steel 72A increases substantially, to logical
It crosses the steel obtained after intermediate frequency furnace smelting, the refining of LF stoves, continuous casting processing, forging, hot rolling, cold rolling and heat treatment and carries out performance
Detection, it is as a result as follows：Tensile strength Rm >=1400MPa；Yield strength R0.2 >=1300MPa, it is female that plank is used in sintered saw bits
Plate, generation plastic deformation damage is small, improves its service life, in addition the steel production cost is low.
3rd, chemical composition rational proportion of the invention improves the quality of product jointly：The addition of Cr is effectively improved steel
Obdurability；The addition of a small amount of V can effectively control the form of crystal grain and distribution in steel, improve the mechanical property, intensity and modeling of steel
Property；The addition of Zr can improve quenching degree.
4th, dispensing of the invention follows " fine fodder principle ", even if with ingot iron, high-purity carburant, electrolysis Mn, metal
The raw metals such as Cr simple substance, Si-Fe enter stove, so as to reduce bringing into for harmful element, improve the degree of purity of steel.
5th, the step of rational proportion of each ingredient of high intensity carbon clean steel of the invention, itself and preparation method, ginseng
It acts synergistically between number, further improves its mechanical performance jointly.
Specific embodiment
With reference to specific embodiment, the present invention is further explained.It should be understood that these embodiments be only used for the present invention without
For limiting the scope of the invention.Externally it should be understood that after present disclosure has been read, those skilled in the art are to this hair
Bright to make various changes or modifications, these equivalent forms also fall within the scope of the appended claims of the present application.
The present invention provides the preparation method of above-mentioned plus zirconium high-carbon clean steel (i.e. high intensity carbon clean steel), this method be with
Intermediate frequency furnace, the production technology that LF stoves are capital equipment.The key feature of the preparation method is " fine fodder principle ", even if recruitment
The raw metals such as industry pure iron, high-purity carburant, electrolysis Mn, metal Cr simple substance, Si-Fe enter stove, so as to reduce harmful element
It brings into, improves the degree of purity of steel.By smelting with active quick lime, fluorite slag making or melting smelting with the poly- flux shielding of expanded perlite
Refining, LF furnace temperatures, composition adjustment, etc. processes prepare product.The preparation method includes the following steps：
Step 1: dispensing：
By ingot iron, carburant, (C matches 0.7-0.8%, that is, after adding in carburant, the C in carburant accounts for ingot iron
Mass percent be 0.7-0.8%), electrolysis Mn, Si-Fe alloy, the raw materials for metallurgy of Cr items, Mo items as intermediate frequency furnace.
In above-mentioned carburant, the mass percent of fixed carbon is more than 99%, it is preferred to use meets YB/T 192-2001 industries
The steel-smelting carburant of standard.
Step 2: intermediate frequency furnace is smelted：
First, in the slag making of intermediate frequency furnace furnace bottom paving 5-10Kg/T iron (i.e. ingot iron) or 5-10Kg/T raw materials for metallurgy
Agent adds in the above-mentioned raw materials for metallurgy prepared in intermediate frequency furnace, and power transmission carries out melt processed by material melting shape each in stove
Into molten bath；Above-mentioned slag former covers molten steel for slag making；Be warming up to again 1620-1640 DEG C of the first tapping temperature (such as 1620 DEG C,
1625 DEG C, 1630 DEG C, 1635 DEG C, 1638 DEG C) when, start to remove the gred, tapping obtains smelting molten steel.
Above-mentioned slag former is the combination of one or more of active quick lime, fluorite, expanded perlite, and preferably activity is raw
Lime.
Step 3: LF stoves refine：
By above-mentioned smelting molten steel be sent into LF stoves in 1600-1640 DEG C (such as 1605 DEG C, 1610 DEG C, 1615 DEG C, 1620 DEG C,
1625 DEG C, 1630 DEG C, 1635 DEG C) carry out refining treatment be no less than 30min (such as 30min, 35min, 40min, 45min,
50min, 55min, 60min), preferably 40-50min, in refining treatment later stage sampling analysis, temperature adjustment to the second tapping temperature
1620-1660 DEG C (such as 1622 DEG C, 1630 DEG C, 1640 DEG C, 1650 DEG C, 1658 DEG C), then into the LF stoves add in electrolysis Mn,
SiFe alloys, VFe alloys, ZrFe alloys comply with the composition design requirement of steel with adjusting component, after being adjusted ingredient
Refining liquid steel.
Step 4: continuous casting processing：
Above-mentioned refining liquid steel is subjected to continuous casting processing, obtains adding zirconium high-carbon clean steel steel billet.
The preparation method of the present invention can also include：Forging and milling step and heat treatment step, pair plus zirconium high-carbon it is pure
Net steel steel billet is forged and rolling process, and finished steel is obtained after heat treatment, wherein forging and rolling mill practice and heat treatment
Common process may be used, technique used in the embodiment of the present invention can also be used.
The high intensity carbon clean steel obtained by invention preparation method, by following mass percent into being grouped as：C
0.67~0.75%, Si 0.15~0.37%, Mn 0.30~0.80%, P≤0.012%, S≤0.006%, Cr 0.20~
0.50%, Mo≤0.30%, V≤0.30%, Zr 0.002~0.100%, surplus are Fe and inevitable impurity.
Illustratively, the mass percent of above-mentioned C can be 0.67%, 0.68%, 0.70%, 0.72%, 0.75% in
Arbitrary value or arbitrary range therebetween；The mass percent of above-mentioned Si can be 0.15%, 0.20%, 0.25%,
0.30%th, the arbitrary value in 0.35%, 0.37% or arbitrary range therebetween；The mass percent of above-mentioned Mn can be
0.30%th, the arbitrary value in 0.40%, 0.45%, 0.50%, 0.60%, 0.70%, 0.80% or arbitrary model therebetween
It encloses；The mass percent of above-mentioned P can be 0.003%, 0.005%, 0.008%, 0.010%, 0.012% in arbitrary value or
Arbitrarily therebetween range；The mass percent of above-mentioned S can be 0.002%, 0.003%, 0.004%, 0.005%,
Arbitrary value or arbitrary range therebetween in 0.006%；The mass percent of above-mentioned Cr can be 0.20%, 0.25%,
0.30%th, the arbitrary value in 0.35%, 0.40%, 0.45%, 0.50% or arbitrary range therebetween；The quality of above-mentioned Mo
Percentage can be arbitrary value in 0.05%, 0.08%, 0.1%, 0.2%, 0.25%, 0.3% or it is arbitrary therebetween
Range；The mass percent of above-mentioned V can be 0.05%, 0.10%, 0.15%, 0.20%, 0.25%, 0.30% in it is arbitrary
Value or arbitrary range therebetween；The mass percent of above-mentioned Zr can be 0.002%, 0.004, %0.005%,
0.01%th, the arbitrary value in 0.02%, 0.05%, 0.08%, 0.1% or arbitrary range therebetween.
Wherein, each component content is preferably：C 0.67~0.75%, Si 0.15~0.3%, Mn 0.3~0.6%, P≤
0.012%, S≤0.006%, Cr 0.25~0.40%, Mo 0.010-0.025%, V 0.20-0.30%, Zr0.002~
0.01%.
Act synergistically between above-mentioned chemical composition proportioning, improve the quality of product jointly, in steel the effect of each component and
The selection reason of each component content is as follows.
C：0.67~0.75%.Carbon is indispensable element in steel, and carbon had both expanded γ phase regions in steel, and carbon is high intensity
Carbide component, invigoration effect of the carbon in steel is the ingredient for the carbide that it is formed and structure have it is close
Relationship, phosphorus content increases in steel, yield point and tensile strength raising, but plasticity and impact reduce, and therefore, consider steel
Performance, the C content of the application are selected as 0.67~0.75%.
Si：0.15~0.37%.In steelmaking process plus silicon is as reducing agent and deoxidier, silicon and the common alloying pair of molybdenum
The high temperature oxidation resistance for improving steel has obvious effects on.
Mn：0.30~0.80%.In steelmaking process, manganese is good deoxidier and desulfurizing agent, and manganese is selected in the present invention
Content can ensure that steel has enough toughness, and has higher intensity and hardness for 0.3-0.8%, improve the quenching property of steel, change
The hot-working character of kind steel.
Mo：≤ 0.30%.Molybdenum is refractory metal, and fusing point is high (2625 DEG C).Molybdenum, which is dissolved into parent metal, can improve solid solution
The recrystallization temperature of body.Molybdenum is the alloying element for reducing γ-Fe phase regions, expanding α-Fe phase regions, and is carbide.
Alloy element of the molybdenum as steel can improve the intensity of steel, particularly elevated temperature strength and toughness；It improves the wearability of steel and changes
Kind quenching degree, weldability and heat resistance.
Cr 0.20~0.50%.The addition of Cr can refine pearlite piece spacing and improve steel hardenability, so as to be effectively improved steel
The obdurability of material；Chromium will be entered with certain proportion in cementite and ferritic phase during perlitic transformation, so as to improve strength character
With change machinability.
V≤0.30%.The addition of a small amount of vanadium can effectively hinder growing up for austenite in steel, so as to fulfill the refinement of crystal grain；
Vanadium can improve the nuclear driving force of cementite, and cementite crystal grain is different location is quick, independently forming core, so as to make cementite point
Dissipate distribution；The addition of vanadium makes the thickness of crystal boundary cementite reduce and along crystal boundary dispersed distribution, and reduce austenite grain size,
So as to improve the mechanical property of steel；Vanadium generates precipitation strength in steel, and pearlite piece interlamellar spacing is refined in high-carbon steel, improves
The intensity and plasticity of steel.
Zr 0.002~0.100%, zirconium have the annealed structure of carbon steel refining effect to improve quenching degree, it makes ferrite
Grain size refines.For high-carbon steel, it has cementite nodularization facilitation, and zirconium is to prevent austenite crystal grain at high temperature
It grows up.
The properties of product of the present invention are compared with the prior art：
1st, in the prior art, there are 65#, 70#, 75#, 65Mn, 70Mn etc. close to steel grade with chemical composition of the present invention, chemistry
Ingredient is shown in Table 1, and the details in table 1 derive from GB/T699-2015《Carbon constructional quality steel》.
Table 1：GB/T 699-2015 carbon constructional quality steels
The mechanical property of above structure steel is shown in Table 2.
Table 2：The mechanical property of carbon constructional quality steel (according to standard GB/T/T 699-2015)
3rd, compared to the steel grade of above-mentioned several trades mark, the mechanical performance of product of the invention is remarkably reinforced：Tensile strength Rm >=
1400MPa, yield strength R0.2 >=1300MPa；Its plank is used in sintered saw bits motherboard, and generation plastic deformation damage is small, improves
Its service life.
Embodiment 1
The present embodiment is smelted using 3T intermediate frequency furnaces, 3T ladle refining furnaces (LF stoves).
The high intensity carbon clean steel of the present embodiment is by following mass percent into being grouped as：
| C | Mn | Si | P | S | Cr | Mo | V | Zr |
| 0.68 | 0.65 | 0.24 | 0.011 | 0.006 | 0.28 | 0.021 | 0.08 | 0.0075 |
Surplus is Fe and inevitable impurity.
The preparation method of the present embodiment includes the following steps：
(1) dispensing：
Using ingot iron, carburant (C matches 0.7-0.8%), electrolysis Mn, Si-Fe alloy, Cr items, Mo items as intermediate frequency
The raw materials for metallurgy of induction furnace.
(2) intermediate frequency furnace is smelted：
The active quick lime of 8Kg/T iron or raw materials for metallurgy is first spread in intermediate frequency furnace furnace bottom, then above-mentioned raw materials for metallurgy is added
Enter in intermediate frequency furnace, power transmission fusing；When being warming up to 1630 DEG C of the first tapping temperature again, start to remove the gred, tapping obtains smelting steel
Liquid.
(3) LF stoves refine：
Above-mentioned smelting molten steel is sent into LF stoves and carries out refining treatment 45min in 1620 DEG C, in the sampling point of refining treatment later stage
Analysis, adjustment molten steel temperature to 1630 DEG C of the second tapping temperature；Electrolysis Mn, SiFe alloy are added in into the LF stoves again, VFe is closed
Gold, ZrFe alloys comply with composition of steel design requirement with adjusting component, are adjusted the refining liquid steel after ingredient.
(4) continuous casting processing：Refining liquid steel using direct casting is handled, obtains continuous casting steel billet, wherein charge weight is
3.15T pours into a mould 480 billet 4.
(5) conducting forging processing：At 900~1150 DEG C of forging temperature, above-mentioned continuous casting steel billet is forged into thick 90mm, width is
The blank of 305mm, it is air-cooled to room temperature.
(6) rolling process：
Forging base is rolled, wherein hot-rolled temperature (initial temperature) is 1150 DEG C, is rolled into thick 4.0mm, wide 305mm
Strip, heat-preservation cotton heat preservation is to room temperature；It is cold rolled to thick 1.5mm, the strip of wide 305mm again；830 DEG C of isothermal oil hardening；Obtain institute
It states and adds zirconium high-carbon clean steel finished product.
The mechanical performance for the strip that the present embodiment obtains is remarkably reinforced：Tensile strength Rm is 1468MPa, yield strength R0.2
For 1345MPa, elongation 9.2%.
Comparative example 1
The high intensity carbon clean steel (i.e.) of this comparative example is by following mass percent into being grouped as：
| C | Mn | Si | P | S | Cr | Mo | V | Zr |
| 0.68 | 0.65 | 0.24 | 0.011 | 0.006 | 0.28 | 0.021 | 0.08 | 0 |
Surplus is Fe and inevitable impurity.
The step parameter of preparation method is same as Example 1 other than step (3) is added without Zr-Fe alloys.
The mechanical performance for the strip that the present embodiment obtains is：Tensile strength Rm is 1170MPa, and yield strength R0.2 is
1100MPa, elongation 5.5%, it can be seen that, the mechanical performance for not adding in the clean steel of Zr elements declines.
Comparative example 2
The high intensity carbon clean steel of this comparative example includes the ingredient of following mass percent：
| C | Mn | Si | P | S | Cr | Mo | V | Zr |
| 0.68 | 0.65 | 0.24 | 0.011 | 0.006 | 0.28 | 0.021 | 0.08 | 0.3 |
Surplus is Fe and inevitable impurity.
The step parameter of preparation method is same as Example 1 other than (3) Zr-Fe alloy dosage increases.
The mechanical performance for the strip that the present embodiment obtains is：Tensile strength Rm is 1450MPa, and yield strength R0.2 is
1370MPa, elongation 1.5%.There is brittle failure in sample, it can be seen that, Zr element dosage models are controlled in the preparation of clean steel
Enclose very crucial, if the too high levels of Zr, the mechanical performance of product declines.
Embodiment 2
The present embodiment is smelted using 3T intermediate frequency furnaces, 3T ladle refining furnaces (LF stoves).
The high intensity carbon clean steel of the present embodiment is by following mass percent into being grouped as：
| C | Mn | Si | P | S | Cr | Mo | V | Zr |
| 0.75 | 0.80 | 0.37 | 0.012 | 0.006 | 0.50 | 0.3 | 0.3 | 0.1 |
Surplus is Fe and inevitable impurity.
The preparation method of the present embodiment includes the following steps：
(1) dispensing：
Using ingot iron, carburant (C matches 0.7-0.8%), electrolysis Mn, Si-Fe alloy, Cr items, Mo items as intermediate frequency
The raw materials for metallurgy of induction furnace.
(2) intermediate frequency furnace is smelted：
The active quick lime of 5Kg/T iron is first spread in intermediate frequency furnace furnace bottom, then above-mentioned raw materials for metallurgy is added in into Medium frequency induction
In stove, power transmission fusing；When being warming up to 1620 DEG C of the first tapping temperature again, start to remove the gred, tapping obtains smelting molten steel.
(3) LF stoves refine：
Above-mentioned smelting molten steel is sent into LF stoves and carries out refining treatment 40min in 1600 DEG C, in the sampling point of refining treatment later stage
Analysis, adjustment molten steel temperature to 1620 DEG C of the second tapping temperature；Electrolysis Mn, SiFe alloy are added in into the LF stoves again, VFe is closed
Gold, ZrFe alloys comply with composition of steel design requirement with adjusting component, are adjusted the refining liquid steel after ingredient.
(4) continuous casting processing：Refining liquid steel using direct casting is handled, obtains continuous casting steel billet, wherein charge weight is
3.15T pours into a mould 480 billet 4.
(5) conducting forging processing：At 900~1150 DEG C of forging temperature, above-mentioned continuous casting steel billet is forged into thick 90mm, width is
The blank of 305mm, it is air-cooled to room temperature.
(6) rolling process：
Forging base is rolled, wherein hot-rolled temperature (initial temperature) is 1150 DEG C, is rolled into thick 4.0mm, wide 305mm
Strip, heat-preservation cotton heat preservation is to room temperature；It is cold rolled to thick 1.5mm, the strip of wide 305mm again；830 DEG C of isothermal oil hardening；Obtain institute
It states and adds zirconium high-carbon clean steel finished product.
The mechanical performance for the strip that the present embodiment obtains is remarkably reinforced：Tensile strength Rm is 1400MPa, yield strength R0.2
For 1320MPa, elongation 9.0%.
Embodiment 3
The present embodiment is smelted using 3T intermediate frequency furnaces, 3T ladle refining furnaces (LF stoves).
The high intensity carbon clean steel of the present embodiment is by following mass percent into being grouped as：
| C | Mn | Si | P | S | Cr | Mo | V | Zr |
| 0.67 | 0.3 | 0.15 | 0.012 | 0.006 | 0.20 | 0.1 | 0.1 | 0.002 |
Surplus is Fe and inevitable impurity.
The preparation method of the present embodiment includes the following steps：
(1) dispensing：
Using ingot iron, carburant (C matches 0.7-0.8%), electrolysis Mn, Si-Fe alloy, Cr items, Mo items as intermediate frequency
The raw materials for metallurgy of induction furnace.
(2) intermediate frequency furnace is smelted：
The active quick lime of 10Kg/T iron is first spread in intermediate frequency furnace furnace bottom, then above-mentioned raw materials for metallurgy is added in into Medium frequency induction
In stove, power transmission fusing；When being warming up to 1640 DEG C of the first tapping temperature again, start to remove the gred, tapping obtains smelting molten steel.
(3) LF stoves refine：
Above-mentioned smelting molten steel is sent into LF stoves and carries out refining treatment 50min in 1640 DEG C, in the sampling point of refining treatment later stage
Analysis, adjustment molten steel temperature to 1660 DEG C of the second tapping temperature；Electrolysis Mn, SiFe alloy are added in into the LF stoves again, VFe is closed
Gold, ZrFe alloys comply with composition of steel design requirement with adjusting component, are adjusted the refining liquid steel after ingredient.
(4) continuous casting processing：Refining liquid steel using direct casting is handled, obtains continuous casting steel billet, wherein charge weight is
3.15T pours into a mould 480 billet 4.
(5) conducting forging processing：At 900~1150 DEG C of forging temperature, above-mentioned continuous casting steel billet is forged into thick 90mm, width is
The blank of 305mm, it is air-cooled to room temperature.
(6) rolling process：
Forging base is rolled, wherein hot-rolled temperature (initial temperature) is 1150 DEG C, is rolled into thick 4.0mm, wide 305mm
Strip, heat-preservation cotton heat preservation is to room temperature；It is cold rolled to thick 1.5mm, the strip of wide 305mm again；830 DEG C of isothermal oil hardening；Obtain institute
It states and adds zirconium high-carbon clean steel finished product.
The mechanical performance for the strip that the present embodiment obtains is remarkably reinforced：Tensile strength Rm is 1430MPa, yield strength R0.2
For 1340MPa, elongation 8.1%.
Embodiment 4
The present embodiment is smelted using 3T intermediate frequency furnaces, 3T ladle refining furnaces (LF stoves).
The high intensity carbon clean steel of the present embodiment is by following mass percent into being grouped as：
| C | Mn | Si | P | S | Cr | Mo | V | Zr |
| 0.72 | 0.45 | 0.18 | 0.012 | 0.006 | 0.45 | 0.2 | 0.3 | 0.01 |
Surplus is Fe and inevitable impurity.
The preparation method of the present embodiment includes the following steps：
(1) dispensing：
Using ingot iron, carburant (C matches 0.7-0.8%), electrolysis Mn, Si-Fe alloy, Cr items, Mo items as intermediate frequency
The raw materials for metallurgy of induction furnace.
(2) intermediate frequency furnace is smelted：
The active quick lime of 6Kg/T iron is first spread in intermediate frequency furnace furnace bottom, then above-mentioned raw materials for metallurgy is added in into Medium frequency induction
In stove, power transmission fusing；When being warming up to 1625 DEG C of the first tapping temperature again, start to remove the gred, tapping obtains smelting molten steel.
(3) LF stoves refine：
Above-mentioned smelting molten steel is sent into LF stoves and carries out refining treatment 45min in 1635 DEG C, in the sampling point of refining treatment later stage
Analysis, adjustment molten steel temperature to 1650 DEG C of the second tapping temperature；Electrolysis Mn, SiFe alloy are added in into the LF stoves again, VFe is closed
Gold, ZrFe alloys comply with composition of steel design requirement with adjusting component, are adjusted the refining liquid steel after ingredient.
(4) continuous casting processing：Refining liquid steel using direct casting is handled, obtains continuous casting steel billet, wherein charge weight is
3.15T pours into a mould 480 billet 4.
(5) conducting forging processing：At 900~1150 DEG C of forging temperature, above-mentioned continuous casting steel billet is forged into thick 90mm, width is
The blank of 305mm, it is air-cooled to room temperature.
(6) rolling process：
Forging base is rolled, wherein hot-rolled temperature (initial temperature) is 1150 DEG C, is rolled into thick 4.0mm, wide 305mm
Strip, heat-preservation cotton heat preservation is to room temperature；It is cold rolled to thick 1.5mm, the strip of wide 305mm again；830 DEG C of isothermal oil hardening；Obtain institute
It states and adds zirconium high-carbon clean steel finished product.
The mechanical performance for the strip that the present embodiment obtains is remarkably reinforced：Tensile strength Rm is 1470MPa, yield strength R0.2
For 1330MPa, elongation 8.5%.
Embodiment 5
The present embodiment is smelted using 3T intermediate frequency furnaces, 3T ladle refining furnaces (LF stoves).
The high intensity carbon clean steel of the present embodiment is by following mass percent into being grouped as：
| C | Mn | Si | P | S | Cr | Mo | V | Zr |
| 0.70 | 0.75 | 0.30 | 0.012 | 0.006 | 0.25 | 0.3 | 0.25 | 0.05 |
Surplus is Fe and inevitable impurity.
The preparation method of the present embodiment includes the following steps：
(1) dispensing：
Using ingot iron, carburant (C matches 0.7-0.8%), electrolysis Mn, Si-Fe alloy, Cr items, Mo items as intermediate frequency
The raw materials for metallurgy of induction furnace.
(2) intermediate frequency furnace is smelted：
The active quick lime of 9Kg/T iron is first spread in intermediate frequency furnace furnace bottom, then above-mentioned raw materials for metallurgy is added in into Medium frequency induction
In stove, power transmission fusing；When being warming up to 1635 DEG C of the first tapping temperature again, start to remove the gred, tapping obtains smelting molten steel.
(3) LF stoves refine：
Above-mentioned smelting molten steel is sent into LF stoves and carries out refining treatment 48min in 1635 DEG C, in the sampling point of refining treatment later stage
Analysis, adjustment molten steel temperature to 1655 DEG C of the second tapping temperature；Electrolysis Mn, SiFe alloy are added in into the LF stoves again, VFe is closed
Gold, ZrFe alloys comply with composition of steel design requirement with adjusting component, are adjusted the refining liquid steel after ingredient.
(4) continuous casting processing：Refining liquid steel using direct casting is handled, obtains continuous casting steel billet, wherein charge weight is
3.15T pours into a mould 480 billet 4.
(5) conducting forging processing：At 900~1150 DEG C of forging temperature, above-mentioned continuous casting steel billet is forged into thick 90mm, width is
The blank of 305mm, it is air-cooled to room temperature.
(6) rolling process：
Forging base is rolled, wherein hot-rolled temperature (initial temperature) is 1150 DEG C, is rolled into thick 4.0mm, wide 305mm
Strip, heat-preservation cotton heat preservation is to room temperature；It is cold rolled to thick 1.5mm, the strip of wide 305mm again；830 DEG C of isothermal oil hardening；Obtain institute
It states and adds zirconium high-carbon clean steel finished product.
The mechanical performance for the strip that the present embodiment obtains is remarkably reinforced：Tensile strength Rm is 1410MPa, yield strength R0.2
For 1325MPa, elongation 8.5%.
Embodiment 6
The present embodiment is smelted using 3T intermediate frequency furnaces, 3T ladle refining furnaces (LF stoves).
The high intensity carbon clean steel of the present embodiment is by following mass percent into being grouped as：
| C | Mn | Si | P | S | Cr | Mo | V | Zr |
| 0.72 | 0.50 | 0.28 | 0.012 | 0.006 | 0.3 | 0.15 | 0.2 | 0.03 |
Surplus is Fe and inevitable impurity.
The preparation method of the present embodiment includes the following steps：
(1) dispensing：
Using ingot iron, carburant (C matches 0.7-0.8%), electrolysis Mn, Si-Fe alloy, Cr items, Mo items as intermediate frequency
The raw materials for metallurgy of induction furnace.
(2) intermediate frequency furnace is smelted：
The active quick lime of 7Kg/T iron is first spread in intermediate frequency furnace furnace bottom, then above-mentioned raw materials for metallurgy is added in into Medium frequency induction
In stove, power transmission fusing；When being warming up to 1625 DEG C of the first tapping temperature again, start to remove the gred, tapping obtains smelting molten steel.
(3) LF stoves refine：
Above-mentioned smelting molten steel is sent into LF stoves and carries out refining treatment 42min in 1610 DEG C, in the sampling point of refining treatment later stage
Analysis, adjustment molten steel temperature to 1640 DEG C of the second tapping temperature；Electrolysis Mn, SiFe alloy are added in into the LF stoves again, VFe is closed
Gold, ZrFe alloys comply with composition of steel design requirement with adjusting component, are adjusted the refining liquid steel after ingredient.
(4) continuous casting processing：Refining liquid steel using direct casting is handled, obtains continuous casting steel billet, wherein charge weight is
3.15T pours into a mould 480 billet 4.
(5) conducting forging processing：At 900~1150 DEG C of forging temperature, above-mentioned continuous casting steel billet is forged into thick 90mm, width is
The blank of 305mm, it is air-cooled to room temperature.
(6) rolling process：
Forging base is rolled, wherein hot-rolled temperature (initial temperature) is 1150 DEG C, is rolled into thick 4.0mm, wide 305mm
Strip, heat-preservation cotton heat preservation is to room temperature；It is cold rolled to thick 1.5mm, the strip of wide 305mm again；830 DEG C of isothermal oil hardening；Obtain institute
It states and adds zirconium high-carbon clean steel finished product.
The mechanical performance for the strip that the present embodiment obtains is remarkably reinforced：Tensile strength Rm is 1450MPa, yield strength R0.2
For 1342MPa, elongation 7.8%.
Claims (10)
1. one kind plus zirconium high-carbon clean steel intermediate frequency furnace smelt preparation method, it is characterised in that：By mass percentage, it is described to add
Zirconium high-carbon clean steel consists of the following compositions：C 0.67~0.75%, Si 0.15~0.37%, Mn 0.30~0.80%, P≤
0.012%, S≤0.006%, Cr 0.20~0.50%, Mo≤0.30%, V≤0.30%, Zr 0.002~0.100% are remaining
It measures as Fe and inevitable impurity；
The preparation method includes the following steps：
Intermediate frequency furnace smelting step：
Slag former and raw materials for metallurgy are added in the intermediate frequency furnace, carries out melt processed；It is warming up to the first tapping temperature again,
Tapping obtains smelting molten steel；
LF stove refinement steps：
The smelting molten steel is sent into LF stoves and carries out refining treatment, in the refining treatment later stage sampling analysis and by molten steel temperature adjustment
To the second tapping temperature, then Mn sources, Si sources, V sources, Zr sources are added in into the LF stoves to adjust molten steel component to design requirement,
Obtain refining liquid steel；
Continuous casting processing step：
The refining liquid steel is subjected to continuous casting processing, obtains described plus zirconium high-carbon clean steel.
2. preparation method according to claim 1, it is characterised in that：
In the intermediate frequency furnace smelting step, the raw materials for metallurgy is ingot iron, carburant, Mn sources, Si sources, Cr sources, Mo
Source；Preferably, the Mn sources are electrolysis Mn, and the Si sources are Si-Fe alloys, and the Cr sources are Cr simple substance, and the Mo sources are Mo
Simple substance；The V sources are V-Fe alloys, and the Zr sources are Zr-Fe alloys.
3. preparation method according to claim 2, it is characterised in that：
In the intermediate frequency furnace smelting step, the dosage of the carburant is the 0.7-0.8% of the ingot iron quality.
4. preparation method according to claim 1, it is characterised in that：
In the intermediate frequency furnace smelting step, the mass ratio of the slag former and raw materials for metallurgy is (5-10)：1000.
5. preparation method according to claim 4, it is characterised in that：
In the intermediate frequency furnace smelting step, the slag former be active quick lime, fluorite, one kind in expanded perlite or
Several combinations.
6. preparation method according to claim 1, it is characterised in that：
In the intermediate frequency furnace smelting step, first tapping temperature is 1620-1640 DEG C.
7. preparation method according to claim 1, it is characterised in that：
In the LF stoves refinement step, the temperature of the refining treatment is 1600-1640 DEG C, and the time is no less than 30min, preferably
For 40-50min；Second tapping temperature is 1620-1660 DEG C.
8. according to preparation method described in claim 1-7, it is characterised in that：The preparation method further includes：In the intermediate frequency sense
It answers in stove smelting step, the slag former is layed in the intermediate frequency furnace furnace bottom.
9. according to any one of the claim 1-8 preparation methods, it is characterised in that：Described plus zirconium high-carbon clean steel by below into
It is grouped as：C 0.67~0.75%, Si 0.15~0.3%, Mn 0.3~0.6%, P≤0.012%, S≤0.006%, Cr
0.25~0.40%, Mo 0.010-0.025%, V 0.20-0.30%, Zr 0.002~0.01%, surplus is Fe and can not keep away
The impurity exempted from.
10. according to any one of the claim 1-9 preparation methods, it is characterised in that：Described plus zirconium high-carbon clean steel tension
Intensity Rm >=1400MPa, yield strength R0.2 >=1300MPa.
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| CN103827337A (en) * | 2011-09-30 | 2014-05-28 | 杰富意钢铁株式会社 | Ingot for bearing and production process |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103827337A (en) * | 2011-09-30 | 2014-05-28 | 杰富意钢铁株式会社 | Ingot for bearing and production process |
Non-Patent Citations (1)
| Title |
|---|
| 刘会林等: "《电弧炉短流程炼钢设备与技术》", 31 January 2012, 北京：冶金工业出版社 * |
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