CN109957634A - A kind of Narrow Composition Control method of low-alloy high-strength abrasion-resistant stee NM400 carbon - Google Patents
A kind of Narrow Composition Control method of low-alloy high-strength abrasion-resistant stee NM400 carbon Download PDFInfo
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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
- 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
- C21C5/36—Processes yielding slags of special composition
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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
- C21C7/0087—Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal
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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
- 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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Abstract
The present invention relates to a kind of Narrow Composition Control methods of low-alloy high-strength abrasion-resistant stee NM400 carbon.Including molten iron pretreatment, converter smelting, LF refining, RH refining and continuous casting working procedure；By the carbon removal in molten steel to≤0.10wt% in converter smelting process, the alloy carburetting stable using phosphorus content in LF refining process controls after carburetting that carbon content reduces the carbon content of molten steel fluctuation after refining in 0.15wt% ~ 0.17wt% in steel.The present invention controls the fluctuation range of low-alloy high-strength abrasion-resistant stee carbon content 2 × 10‑4Within, control precision is substantially improved, and is conducive to the performance and quality stability that improve finished steel.
Description
Technical field
The present invention relates to steelmaking technical field more particularly to a kind of narrow ingredients of low-alloy high-strength abrasion-resistant stee NM400 carbon
Control method.
Background technique
Abrasion-resistant stee is often referred to the strong steel material of abrasion resistance properties, typically represent steel grade be NM360, NM400,
NM450.Abrasion-resistant stee function admirable is widely used in mining machinery, engineering machinery, agricultural machinery, building materials, electric machinery, iron
Road transport Shu Deng department, has broad application prospects；It is good with comprehensive performance, production is flexible and convenient, alloy content is low and
The advantages that wear resistance is excellent.
Carbon is the important element for influencing wear-resisting hardness of steel, hardness, toughness and harden ability, and influences steel microscopic structure the most
Important element.With the increase of carbon content, the hardness of steel increases, and impact flexibility is remarkably decreased, and wearability is gradually increased.In order to
Make abrasion-resistant stee excellent combination property, stable product quality, it is necessary to reinforce the process control needs to steel making working procedure, improve carbon in steel
The control precision of content controls carbon 2 × 10-4Within, to improve finished steel performance uniformity, improve product quality；And it is real
Border production in stability contorting carbon content technical difficulty it is larger, process is general are as follows: converter tapping, LF refining depth desulfurization carburetting,
Into RH degassing, continuous casting.After the shortcomings that prior art process, is converter decarburization, postorder carburetting control and fluctuate it is larger,
It is in particular in that LF refining carburetting effect is unstable, process carbon content fluctuation later is big, and technique controlling difficulty is high, and product quality is not
Stablize.
Summary of the invention
The present invention provides a kind of Narrow Composition Control methods of low-alloy high-strength carbon abrasion resistant steel NM400 carbon, pass through change
Process for making controls the fluctuation range of low-alloy high-strength abrasion-resistant stee carbon content 2 × 10-4Within, control precision substantially mentions
It rises, is conducive to the performance and quality stability that improve finished steel.
In order to achieve the above object, the present invention is implemented with the following technical solutions:
A kind of Narrow Composition Control method of low-alloy high-strength abrasion-resistant stee NM400 carbon, including molten iron pretreatment, converter smelting, LF
Refining, RH refining and continuous casting working procedure；By the carbon removal in molten steel to≤0.10wt% in converter smelting process, in LF refining process
Using the alloy carburetting that phosphorus content is stable, carbon content reduces refining knot in 0.15wt% ~ 0.17wt% in steel after control carburetting
Carbon content of molten steel fluctuation after beam.
The Narrow Composition Control method of above-mentioned low-alloy high-strength abrasion-resistant stee NM400 carbon in the converter smelting process, is blown
The oxygen time is 810 ~ 860 seconds；Slag making materials are added into molten steel in converter steelmaking process, when carbon content in molten steel≤
0.10wt%, oxygen content reach 0.014wt% ~ 0.017wt%, and when liquid steel temperature reaches 1630 ~ 1680 DEG C in converter tapping to steel
In packet；
In the LF refining process, reduction and desulfurization is carried out in LF furnace, and high carbon ferromanganese is added after having made slag and carbon dust adjustment carbon contains
Amount, while various chemical composition contents and temperature in molten steel being made to reach target molten steel requirement；Steel water oxygen after control carburetting
Content≤0.008wt%, carbon content 0.15wt% ~ 0.17wt% in steel；
After the RH refining procedure, steel oxygen content in water≤0.002wt%, carbon content 0.15wt% ~ 0.17wt% are controlled；Its
Its chemical composition content and temperature reach target molten steel requirement；
In the continuous casting working procedure, in basket pouring, big water-coating port is blown into argon gas, and tundish is added Ultra-low carbon coverture and carries out
Molding casting.
The Narrow Composition Control method of above-mentioned low-alloy high-strength abrasion-resistant stee NM400 carbon, in the hot metal pre process procedures,
Molten iron is transferred to converter smelting as Sulfur Content in Hot Iron content≤0.008wt%.
The Narrow Composition Control method of above-mentioned low-alloy high-strength abrasion-resistant stee NM400 carbon, in the converter smelting process, to
The slag making materials added in molten steel are active lime, light dolomite and sinter；Slag Retaining Process, ladle are used in tapping process
Middle addition 1 ~ 4kg/t lime；
The LF refining after treatment is blown 5 ~ 10 minutes only, and molten steel is made to be transferred to RH process；
The RH refining procedure uses RH vacuum cycle device further uniform molten steel composition and temperature, removes gas and impurity,
After treatment stands 10 ~ 20 minutes, and molten steel is made to be transferred to continuous casting program；
Solid-state carbon content≤the 1.5wt% for the Ultra-low carbon coverture being added in the continuous casting working procedure.
Theory analysis of the present invention is as follows:
Converter Oxigen Blowing decarburization, carbon content of molten steel is dropped within target, is created conditions for subsequent carburetting, controls oxygen blow duration to control
Blowing oxygen quantity processed, blowing oxygen quantity is low to be unfavorable for carbon drop, and blowing oxygen quantity height is then unfavorable for the stabilization of carbon content in molten steel, is also unfavorable for subsequent LF
The formation of refining reduction slag.Tapping process prevents oxidizing slag under converter using Slag Retaining Process, to control the oxidisability of molten steel, prevents
The fluctuation of carbon content.Lime is added in ladle, air can be completely cut off after slagging, stablizes carbon, oxygen content and subsequent fine in molten steel
Refine quick slag making.
High carbon ferromanganese and carbon dust tune carbon is added after having made reducing slag in LF refining.Wherein high carbon ferromanganese alloy carbon content control exists
4wt% ~ 6wt%, yield of alloy 92% ~ 93%, carbon dust carbon content control is in 94wt% ~ 96wt%, recovery rate 95% ~ 96%, high-carbon manganese
The carbon content and recovery rate of iron and carbon dust are stablized, and it is higher according to target to control carbon content precision, and cost is relatively low for carbon dust carburetting.
RH refining procedure, molten steel is in vacuum and cyclic process, non-uniform components and temperature, removes gas and is mingled with, improves
Cleanliness stablizes carbon, oxygen content in molten steel.
In continuous casting working procedure, Ultra-low carbon coverture is added in mouth of a river molding casting and tundish, makes molten steel in casting process
Completely cut off air, guarantees the stabilization of final carbon, oxygen ingredient.
Compared with prior art, the beneficial effects of the present invention are:
The present invention is controlled the fluctuation range of low-alloy high-strength abrasion-resistant stee carbon content 2 × 10 by improving process for making-4With
Interior, control precision is substantially improved, and the performance and quality stability of finished steel greatly improved.
Specific embodiment
The present invention is a kind of Narrow Composition Control method of low-alloy high-strength abrasion-resistant stee NM400 carbon, and the carbon in molten steel is being turned
Furnaceman's sequence is removed in fixed range, and LF refining adds the stable high carbon ferromanganese and carbon dust of phosphorus content again, after reducing refining
Molten steel recarburization amount；Concrete technology flow process is as follows:
1) molten iron pre-processes: passivation particle magnesium is blown into molten iron using singly-blowing magnesium grain desulfurizing iron equipment, and it is clean to skim,
Molten iron is transferred to converter smelting as Sulfur Content in Hot Iron content≤0.008wt%；
2) converter smelting: oxygen blast carbon drop is carried out in converter by molten iron smelting into molten steel, oxygen blow duration is 810 ~ 860 seconds；In converter
Active lime, light dolomite and sinter are added in smelting process into molten steel, as carbon content≤0.10wt%, oxygen in molten steel
Content reaches 0.014wt% ~ 0.017wt%, and when liquid steel temperature reaches 1630 ~ 1680 DEG C in converter in tapping to ladle, tapping
Slag Retaining Process is used in the process, and 1 ~ 4kg/t lime is added in ladle；
3) LF refining: carrying out reduction and desulfurization in LF furnace, high carbon ferromanganese and carbon dust adjustment carbon content is added after having made slag, while making steel
Various chemical composition contents and temperature reach target molten steel requirement in water；Control carburetting after steel oxygen content in water be≤
0.008wt%, carbon content 0.15wt% ~ 0.17wt% in steel；After treatment is blown 5 ~ 10 minutes only, and molten steel is made to be transferred to RH process；
4) RH vacuum refining: RH vacuum cycle device further uniform molten steel composition and temperature are used, gas and impurity, steel are removed
Oxygen content in water≤0.002wt%, carbon content 0.15wt% ~ 0.17wt% in steel；Make various chemical composition contents and temperature in molten steel
Reach target molten steel requirement；After treatment stands 10 ~ 20 minutes, and molten steel is made to be transferred to continuous casting program；
5) continuous casting: in basket pouring, big water-coating port is blown into argon gas, and Ultra-low carbon coverture (solid-state carbon content is added in tundish
≤ 1.5wt%) carry out molding casting.
Below by way of specific embodiment, the present invention will be further described: Examples 1 to 5 is all made of 100 tons of oxygen tops bottom
Combined blown converter, 100 tons of LF ladle refining furnaces, 100 tons of double-station RH vacuum refining furnaces and Slab Caster produce NM400 high
Strong abrasion-resistant stee.
[embodiment 1]
A kind of Narrow Composition Control method of low-alloy high-strength abrasion-resistant stee NM400 carbon,
Molten iron pretreatment: passivation particle magnesium is blown into molten iron using singly-blowing magnesium grain desulfurizing iron equipment, wherein content of magnesium >=
Molten iron is transferred to converter smelting when Sulfur Content in Hot Iron content is 0.008wt% by 92wt%；
Converter smelting: the molten iron after desulfurization is blended into converter, oxygen blow duration 810s is added in converter steelmaking process into it
Active lime, light dolomite, sinter, carbon content is 0.10 wt%, oxygen content reaches 0.016wt% when turning in molten steel in the stove,
And Slag Retaining Process is used in tapping process in tapping to ladle when liquid steel temperature reaches 1680 DEG C in converter；It is added in ladle
4kg/t lime；
LF refining: it is reproducibility slag that aluminum steel adjustment steel slag, which is added, and high carbon ferromanganese alloy and carbon is added after steel slag is milky
Powder carburetting, while ferrotianium and ferro-boron is added, adjust 0.015 ~ 0.025 wt % of molten steel Ti content, boron content 0.0012 ~ 0.0018
wt%.Steel oxygen content in water is 0.008wt%, carbon content 0.16wt% in steel after controlling carburetting, drops electrode later and heats up, locates
It is blown only after reason 7 minutes, molten steel is made to be transferred to RH process；
High carbon ferromanganese alloy carbon content control is in 4wt% ~ 6wt%, yield of alloy 92% ~ 93%, carbon powder content control 94wt% ~
96wt%, recovery rate 95% ~ 96%, additional amount are calculated according to target carbometer, and in the present embodiment, molten steel target carbon content is
0.16wt%, molten steel amount are 100t, and high carbon ferromanganese 470kg, carbon dust 50kg is added.Before entering RH, blows only 7 minutes, make field trash
Sufficiently float；
RH vacuum refining: starting RH vacuum cycle device evacuation time 30 minutes, pure degassing time 10 minutes, vacuum degree be≤
100Pa；Steel oxygen content in water is 0.001wt%, controls carbon content 0.16wt% in steel, and calcium line town is added in fluctuation≤0.0010wt%
It is quiet, before the casting of upper machine, 10 minutes are stood, field trash is made sufficiently to float；
Continuous casting: big water-coating port is blown into argon gas, and adjustment argon flow is 20m3/ h, and solid-state carbon content≤1.5wt% is added to middle packet
Ultra-low carbon coverture 3kg/t carry out molding casting;Control carbon content fluctuation≤0.0010wt% in molten steel.
Through examining, the carbon content in finished steel is 0.16wt%.Compared with target carbon content 0.16wt%, meet precision 2 ×
10-4Within requirement.
[embodiment 2]
A kind of Narrow Composition Control method of low-alloy high-strength abrasion-resistant stee NM400 carbon,
Molten iron pretreatment: passivation particle magnesium is blown into molten iron using singly-blowing magnesium grain desulfurizing iron equipment, wherein content of magnesium >=
Molten iron is transferred to converter smelting when Sulfur Content in Hot Iron content is 0.005wt% by 92wt%；
Converter smelting: the molten iron after desulfurization is blended into converter, oxygen blow duration 860s is added in converter steelmaking process into it
Active lime, light dolomite, sinter, carbon content is 0.08 wt%, oxygen content reaches 0.014wt% when turning in molten steel in the stove,
And Slag Retaining Process is used in tapping process in tapping to ladle when liquid steel temperature reaches 1630 DEG C in converter；It is added in ladle
1kg/t lime；
LF refining: it is reproducibility slag that aluminum steel adjustment steel slag, which is added, and high carbon ferromanganese alloy and carbon is added after steel slag is milky
Powder carburetting, while ferrotianium and ferro-boron is added, adjust 0.015 ~ 0.025 wt % of molten steel Ti content, boron content 0.0012 ~ 0.0018
wt%.Steel oxygen content in water is 0.005wt%, carbon content 0.15wt% in steel after controlling carburetting, drops electrode later and heats up, locates
It is blown only after reason 5 minutes, molten steel is made to be transferred to RH process；
High carbon ferromanganese alloy carbon content control is controlled in 4wt% ~ 6wt%, yield of alloy 92% ~ 93%, carburetting agent content in 94wt%
~ 96wt%, recovery rate 95% ~ 96%, additional amount are calculated according to target carbometer, and in the present embodiment, molten steel target carbon content is
0.16wt%, molten steel amount are 100t, and high carbon ferromanganese 544kg, carburant 70kg is added.Before entering RH, blows only 5 minutes, make to be mingled with
Object sufficiently floats；
RH vacuum refining: starting RH vacuum cycle device evacuation time 25 minutes, pure degassing time 9 minutes, vacuum degree be≤
100Pa；Steel oxygen content in water is 0.002wt%, controls carbon content 0.15wt% in steel, and calcium line town is added in fluctuation≤0.0010wt%
It is quiet, before the casting of upper machine, 15 minutes are stood, field trash is made sufficiently to float.
Continuous casting: big water-coating port is blown into argon gas, and adjustment argon flow is 20m3/ h, and to middle packet be added solid-state carbon content≤
The Ultra-low carbon coverture 5kg/t of 1.5wt% carries out molding casting, controls carbon content fluctuation≤0.0010wt% in molten steel.
Through examining, the carbon content in finished steel is 0.15wt%.Compared with target carbon content 0.16wt%, meet precision 2 ×
10-4Within requirement.
[embodiment 3]
A kind of Narrow Composition Control method of low-alloy high-strength abrasion-resistant stee NM400 carbon,
Molten iron pretreatment: passivation particle magnesium is blown into molten iron using singly-blowing magnesium grain desulfurizing iron equipment, wherein content of magnesium >=
92%, molten iron is transferred to converter smelting as Sulfur Content in Hot Iron content≤0.006wt%；
Converter smelting: the molten iron after desulfurization is blended into converter, oxygen blow duration 830s is added in converter steelmaking process into it
Active lime, light dolomite, sinter, carbon content is 0.09 wt%, oxygen content reaches 0.017wt% when turning in molten steel in the stove,
And Slag Retaining Process is used in tapping process in tapping to ladle when liquid steel temperature reaches 1650 DEG C in converter；It is added in ladle
3kg/t lime；
LF refining: it is reproducibility slag that aluminum steel adjustment steel slag, which is added, and high carbon ferromanganese alloy and carbon is added after steel slag is milky
Powder carburetting, while ferrotianium and ferro-boron is added, adjust 0.015 ~ 0.025 wt % of molten steel Ti content, boron content 0.0012 ~ 0.0018
wt%.Steel oxygen content in water is 0.007wt%, carbon content 0.16wt% in steel after controlling carburetting, drops electrode later and heats up, locates
It is blown only after reason 8 minutes, molten steel is made to be transferred to RH process；
High carbon ferromanganese alloy carbon content control is in 4wt% ~ 6wt%, yield of alloy 92% ~ 93%, carbon powder content control 94wt% ~
96wt%, recovery rate 95% ~ 96%, additional amount are calculated according to target carbometer, and in the present embodiment, molten steel target carbon content is
0.16wt%, molten steel amount are 100t, and high carbon ferromanganese 307kg, carbon dust 70kg is added.Before entering RH, blows only 8 minutes, make field trash
Sufficiently float；
RH vacuum refining: starting RH vacuum cycle device evacuation time 29 minutes, pure degassing time 12 minutes, vacuum degree be≤
100Pa.Steel oxygen content in water is 0.001wt%, controls carbon content 0.16wt% in steel, and calcium line town is added in fluctuation≤0.0010wt%
It is quiet, before the casting of upper machine, 20 minutes are stood, field trash is made sufficiently to float；
Continuous casting: big water-coating port is blown into argon gas, and adjustment argon flow is 20m3/ h, and solid-state carbon content≤1.5wt% is added to middle packet
Ultra-low carbon coverture 4kg/t carry out molding casting, control molten steel in carbon content fluctuation≤0.0010wt%.
Through examining, the carbon content in finished steel is 0.16wt%.Compared with target carbon content 0.16wt%, meet precision 2 ×
10-4Within requirement.
[embodiment 4]
A kind of Narrow Composition Control method of low-alloy high-strength abrasion-resistant stee NM400 carbon,
Molten iron pretreatment: passivation particle magnesium is blown into molten iron using singly-blowing magnesium grain desulfurizing iron equipment, wherein content of magnesium >=
92%, molten iron is transferred to converter smelting when Sulfur Content in Hot Iron content is 0.008wt%；
Converter smelting: the molten iron after desulfurization is blended into converter, oxygen blow duration 835s is added in converter steelmaking process into it
Active lime, light dolomite, sinter, carbon content is 0.09 wt%, oxygen content reaches 0.015wt% when turning in molten steel in the stove,
And Slag Retaining Process is used in tapping process in tapping to ladle when liquid steel temperature reaches 1655 DEG C in converter；It is added in ladle
2kg/t lime；
LF refining: it is reproducibility slag that aluminum steel adjustment steel slag, which is added, and high carbon ferromanganese alloy and carbon is added after steel slag is milky
Powder carburetting, while ferrotianium and ferro-boron is added, adjust 0.015 ~ 0.025 wt % of molten steel Ti content, boron content 0.0012 ~ 0.0018
wt%.Steel oxygen content in water is 0.006wt%, carbon content 0.17wt% in steel after controlling carburetting, drops electrode later and heats up, locates
It is blown only after reason 6 minutes, molten steel is made to be transferred to RH process；
High carbon ferromanganese alloy carbon content control is in 4wt% ~ 6wt%, yield of alloy 92% ~ 93%, carbon powder content control 94wt% ~
96wt%, recovery rate 95% ~ 96%, additional amount are calculated according to target carbometer, and in the present embodiment, molten steel target carbon content is
0.16wt%, molten steel amount are 100t, and high carbon ferromanganese 307kg, carbon dust 70kg is added.Before entering RH, blows only 6 minutes, make field trash
Sufficiently float；
RH vacuum refining: starting RH vacuum cycle device evacuation time 30 minutes, pure degassing time 12 minutes, vacuum degree be≤
100Pa.Steel oxygen content in water is 0.002wt%, controls carbon content 0.17wt% in steel, and calcium line town is added in fluctuation≤0.0010wt%
It is quiet, before the casting of upper machine, 10 minutes are stood, field trash is made sufficiently to float.
Continuous casting: big water-coating port is blown into argon gas, and adjustment argon flow is 20m3/ h, and to middle packet be added solid-state carbon content≤
The Ultra-low carbon coverture 3kg/t of 1.5wt% carries out molding casting.Control carbon content fluctuation≤0.0010wt% in molten steel.
Through examining, the carbon content in finished steel is 0.17wt%.Compared with target carbon content 0.16wt%, meet precision 2 ×
10-4Within requirement.
[embodiment 5]
A kind of Narrow Composition Control method of low-alloy high-strength abrasion-resistant stee NM400 carbon,
Molten iron pretreatment: passivation particle magnesium is blown into molten iron using singly-blowing magnesium grain desulfurizing iron equipment, wherein content of magnesium >=
92%, molten iron is transferred to converter smelting when Sulfur Content in Hot Iron content is 0.007wt%；
Converter smelting: the molten iron after desulfurization is blended into converter, oxygen blow duration 850s is added in converter steelmaking process into it
Active lime, light dolomite, sinter, carbon content is 0.10 wt%, oxygen content reaches 0.015wt% when turning in molten steel in the stove,
And Slag Retaining Process is used in tapping process in tapping to ladle when liquid steel temperature reaches 1640 DEG C in converter；It is added in ladle
2kg/t lime；
LF refining: it is reproducibility slag that aluminum steel adjustment steel slag, which is added, and high carbon ferromanganese alloy and carbon is added after steel slag is milky
Powder carburetting, while ferrotianium and ferro-boron is added, adjust 0.015 ~ 0.025 wt % of molten steel Ti content, boron content 0.0012 ~ 0.0018
wt%.Steel oxygen content in water is 0.006wt%, carbon content 0.16wt% in steel after controlling carburetting, drops electrode later and heats up, locates
It is blown only after reason 10 minutes, molten steel is made to be transferred to RH process；
High carbon ferromanganese alloy carbon content control is in 4wt% ~ 6wt%, yield of alloy 92% ~ 93%, carbon powder content control 94wt% ~
96wt%, recovery rate 95% ~ 96%, additional amount are calculated according to target carbometer, and in the present embodiment, molten steel target carbon content is
0.16wt%, molten steel amount are 100t, and high carbon ferromanganese 470kg, carbon dust 50kg is added.Before entering RH, blows only 10 minutes, make to be mingled with
Object sufficiently floats；
RH vacuum refining: starting RH vacuum cycle device evacuation time 28 minutes, pure degassing time 10 minutes, vacuum degree be≤
100Pa.Steel oxygen content in water is 0.002wt%, controls carbon content 0.16wt% in steel, and calcium line town is added in fluctuation≤0.0010wt%
It is quiet, before the casting of upper machine, 15 minutes are stood, field trash is made sufficiently to float；
Continuous casting: big water-coating port is blown into argon gas, and adjustment argon flow is 20m3/ h, and solid-state carbon content≤1.5wt% is added to middle packet
Ultra-low carbon coverture 4kg/t carry out molding casting.Control carbon content fluctuation≤0.0010wt% in molten steel.
Through examining, the carbon content in finished steel is 0.160wt%.Compared with target carbon content 0.16wt%, meet precision 2 ×
10-4Within requirement.
Claims (9)
1. a kind of Narrow Composition Control method of low-alloy high-strength abrasion-resistant stee NM400 carbon, including molten iron pretreatment, converter smelting,
LF refining, RH refining and continuous casting working procedure；It is characterized by: by the carbon removal in molten steel to≤0.10wt% in converter smelting process,
Using the stable alloy carburetting of phosphorus content in LF refining process, control after carburetting in steel carbon content 0.15wt% ~
0.17wt% reduces the carbon content of molten steel fluctuation after refining.
2. the Narrow Composition Control method of low-alloy high-strength abrasion-resistant stee NM400 carbon as described in claim 1, it is characterised in that:
In the converter smelting process, oxygen blow duration is 810 ~ 860 seconds；Slag making materials are added into molten steel in converter steelmaking process,
When carbon content≤0.10wt%, oxygen content reach 0.014wt% ~ 0.017wt% in molten steel, and in converter liquid steel temperature reach 1630 ~
At 1680 DEG C in tapping to ladle.
3. the Narrow Composition Control method of low-alloy high-strength abrasion-resistant stee NM400 carbon as described in claim 1, it is characterised in that:
In the LF refining process, reduction and desulfurization is carried out in LF furnace, high carbon ferromanganese and carbon dust adjustment carbon content is added after having made slag, together
When so that various chemical composition contents and temperature in molten steel is reached target molten steel requirement；Control carburetting after steel oxygen content in water≤
0.008wt%, carbon content 0.15wt% ~ 0.17wt% in steel.
4. the Narrow Composition Control method of low-alloy high-strength abrasion-resistant stee NM400 carbon as described in claim 1, it is characterised in that:
After the RH refining procedure, steel oxygen content in water≤0.002wt%, carbon content 0.15wt% ~ 0.17wt% are controlled；Otherization
It learns component content and temperature reaches target molten steel requirement；
In the continuous casting working procedure, in basket pouring, big water-coating port is blown into argon gas, and tundish is added Ultra-low carbon coverture and carries out
Molding casting.
5. the Narrow Composition Control method of the low-alloy high-strength abrasion-resistant stee NM400 carbon as described in wantonly 1 in Claims 1 to 4,
It is characterized in that: in the hot metal pre process procedures, molten iron being transferred to converter smelting as Sulfur Content in Hot Iron content≤0.008wt%.
6. the Narrow Composition Control method of the low-alloy high-strength abrasion-resistant stee NM400 carbon as described in wantonly 1 in Claims 1 to 4,
Be characterized in that: in the converter smelting process, the slag making materials added into molten steel are active lime, light dolomite and sintering
Mine；Slag Retaining Process is used in tapping process, and 1 ~ 4kg/t lime is added in ladle.
7. the Narrow Composition Control method of the low-alloy high-strength abrasion-resistant stee NM400 carbon as described in wantonly 1 in Claims 1 to 4,
Be characterized in that: the LF refining after treatment is blown 5 ~ 10 minutes only, and molten steel is made to be transferred to RH process.
8. the Narrow Composition Control method of the low-alloy high-strength abrasion-resistant stee NM400 carbon as described in wantonly 1 in Claims 1 to 4,
Be characterized in that: the RH refining procedure using RH vacuum cycle device further uniform molten steel composition and temperature, removing gas and
Impurity, after treatment stand 10 ~ 20 minutes, molten steel are made to be transferred to continuous casting program.
9. the Narrow Composition Control method of the low-alloy high-strength abrasion-resistant stee NM400 carbon as described in wantonly 1 in Claims 1 to 4,
It is characterized in that: the solid-state carbon content≤1.5wt% for the Ultra-low carbon coverture being added in the continuous casting working procedure.
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