CN108998632A - A kind of increasing method for nitrogen of pinion steel 18CrMnBH - Google Patents
A kind of increasing method for nitrogen of pinion steel 18CrMnBH Download PDFInfo
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- CN108998632A CN108998632A CN201811023678.6A CN201811023678A CN108998632A CN 108998632 A CN108998632 A CN 108998632A CN 201811023678 A CN201811023678 A CN 201811023678A CN 108998632 A CN108998632 A CN 108998632A
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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
- C21C7/072—Treatment with gases
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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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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- Chemical & Material Sciences (AREA)
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The present invention provides the increasing method for nitrogen of pinion steel 18CrMnBH a kind of, gear 18CrMnBH steel is produced using the smelting process of " EBT electric furnace with eccentric bottom → LF refining furnace → VD vacuum drying oven → continuous casting ", and includes the following steps: that (1) carries out deoxidation and alloying using common process；(2) 15~20min of argon bottom-blowing, flow are 200~500NL/min to LF furnace in place, switch pipeline bottom blowing nitrogen after a complete analysis until bull ladle, bottom blowing nitrogen flow is 200~500NL/min；(3) VD furnace bottom blowing nitrogen in place, vacuum time 20~30 minutes, after vacuum breaker, then quiet 5~15min of nitrogen blowing, flow control switch pipeline argon bottom-blowing in 50~200NL/min, flow control is 50~200NL/min, continuous casting on bull ladle after 10~20min of argon bottom-blowing；The increasing method for nitrogen of pinion steel 18CrMnBH of the present invention produces 18CrMnBH pinion steel using bottom blowing N Gas Alloying, and the process is easy to accomplish, it is not required to additionally increase equipment, production cost is reduced, while without additional raw material, meeting the demand of the degree of purity of molten steel.
Description
Technical field
The present invention relates to field of steel-making, and in particular to a kind of increasing method for nitrogen of pinion steel 18CrMnBH.
Background technique
Gear 18CrMnBH steel, inclusion behavior, mechanical property, uniform fine grain, end hardenability require stringent, existing rank
Section 18CrMnBH pinion steel production, is vacuum-treated, this process denitrification is up to 50%, it is therefore desirable to largely mend after vacuum
Add nitrogenized manganese, is just able to satisfy nitrogen component requirement, but the addition of a large amount of nitrogenized manganeses will affect the degree of purity of molten steel, and nitrogenized manganese
Alloy price is one times of high manganese, can greatly increase the cost of smelting；Therefore a kind of smelting of new 18CrMnBH steel is needed
Smelting method not only requires the nitrogen pick-up demand that can satisfy steelmaking process, but also has been able to solve the degree of purity and cost of 18CrMnBH steel
Problem.
Summary of the invention
Technical assignment of the invention is to be directed to the above the deficiencies in the prior art, and provide the increasing of pinion steel 18CrMnBH a kind of
Nitrogen method by the way of bottom blowing nitrogen by Control of Nitrogen Content between 0.01%~0.015%, while meeting the pure of molten steel
The demand of degree.
The technical solution adopted by the present invention to solve the technical problems is: a kind of pinion steel
The increasing method for nitrogen of 18CrMnBH, using the smelting of " EBT electric furnace with eccentric bottom → LF refining furnace → VD vacuum drying oven → continuous casting "
Sweetening process produces gear 18CrMnBH steel, and includes the following steps:
1. carrying out deoxidation and alloying using common process；
15~20min of argon bottom-blowing, flow are 200~500NL/min to 2.LF furnace in place, switch pipeline after a complete analysis
Bottom blowing nitrogen until bull ladle, bottom blowing nitrogen flow is 200~
500NL/min；
3.VD furnace bottom blowing nitrogen in place, vacuum time 20~30 minutes, after vacuum breaker, quiet 5~15min of nitrogen blowing, flow
Then control switches pipeline argon bottom-blowing in 50~200NL/min, flow control is 50~200NL/min, and argon bottom-blowing 10~
Continuous casting on bull ladle after 20min.
Further, the time of LF furnace switching pipeline bottom blowing nitrogen is 40~50min.
Further, bottom blowing nitrogen, nitrogen flow are 200~300NL/min to VD furnace in place.
Further, in EBT electric furnace charging process, 70% or more molten iron allocation ratio, remaining supplying steel scrap, electric power feeding time
5~15min stablizes electric furnace nitrogen content of molten steel；
Further, protection pouring molten steel is carried out using the argon gas that flow is 10~50NL/min in continuous casting process.
Further, it is C:0.180~0.195% that pinion steel 18CrMnBH steel grade, which requires chemical component mass percent,；
Si:0.10~0.25%；Mn:1.33~1.37%；P :≤0.025%；S:0.015~0.030%；Cr:1.23~1.27%；
Ni:0.11~0.15%；Cu :≤0.15%；B:0.0020~0.0030%；Al:0.020~0.040%；N:0.010~
0.015%；Surplus is iron and inevitable impurity.
Further, meet the molten steel composition of a complete analysis in the LF furnace of the pinion steel 18CrMnBH composition of steel
For C:0.115~0.155%；Si:0.10~0.20%；Mn:1.15~1.25%；P :≤0.025%；S :≤0.025%；
Cr:1.05~1.15%；Ni:0.10~0.30%；Cu :≤0.20%；Al:0.020~0.055%；N:0.007~
0.010%；Surplus is iron and inevitable impurity.
The smelting step being not directed in the present invention is using conventional method for making steel.
Compared with prior art, the increasing method for nitrogen of pinion steel 18CrMnBH of the present invention, using bottom blowing N Gas Alloying
18CrMnBH pinion steel is produced, accomplishes that LF, VD process nitrogen flushing control nitrogen in steel content, the process by connecting nitrogen pipeline
It is easy to accomplish, it is not required to additionally increase equipment, reduces production cost, while without additional raw material, meeting the degree of purity of molten steel
Demand.
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 described herein, specific examples are only used to explain the present invention, is not used to limit
The fixed present invention.
The present invention provides the increasing method for nitrogen of pinion steel 18CrMnBH a kind of, using " EBT electric furnace with eccentric bottom → LF refining furnace →
The smelting process of VD vacuum drying oven → continuous casting " produces gear 18CrMnBH steel, and includes the following steps:
1. carrying out deoxidation and alloying using common process；
15~20min of argon bottom-blowing, flow are 200~500NL/min to 2.LF furnace in place, switch pipeline after a complete analysis
Bottom blowing nitrogen, flow are 200~500NL/min, bull ladle after 40~50min of bottom blowing nitrogen；
3.VD furnace bottom blowing nitrogen in place, flow are 200~300NL/min, vacuum time 20~30 minutes, after vacuum breaker,
Then quiet 5~15min of nitrogen blowing, flow control switch pipeline argon bottom-blowing in 50~200NL/min, and flow is 50~
Continuous casting on bull ladle after 200NL/min, 10~20min of argon bottom-blowing.
Further, in EBT electric furnace charging process, 70% or more molten iron allocation ratio, remaining supplying steel scrap, electric power feeding time
5~15min stablizes electric furnace nitrogen content of molten steel；
Further, protection pouring molten steel is carried out using the argon gas that flow is 10~50NL/min in continuous casting process.
Wherein, it is as shown in table 1 to smelt each stage molten steel composition:
Each stage molten steel composition table of table 1
Embodiment 1
The present embodiment is smelter of certain steel mill using " EBT electric furnace with eccentric bottom → LF refining furnace → VD vacuum drying oven → continuous casting "
Skill produce gear 18CrMnBH steel, it is desirable that in be bundled into product nitrogen content be 0.010~0.015%.
When implementation, the charging of EBT electric furnace, molten iron allocation ratio 75%, remaining supplying steel scrap, electric power feeding time 5min, using normal
It advises technique and carries out deoxidation and alloying, argon bottom-blowing 18min, flow 300NL/min are cut LF furnace after complete analysis in place
Change pipeline bottom blowing nitrogen, bull ladle after flow control 200NL/min, bottom blowing nitrogen 40min；VD furnace bottom blowing nitrogen in place, flow
For 200NL/min, vacuum time 20 minutes, after vacuum breaker, then quiet nitrogen blowing 5min, flow control switched in 50NL/min
Pipeline argon bottom-blowing, continuous casting on bull ladle after flow control 100NL/min, argon bottom-blowing 15min use flow in continuous casting process
Protection pouring molten steel is carried out for the argon gas of 20NL/min；
In be bundled into product nitrogen content be 0.010%.
Embodiment 2
The present embodiment is smelter of certain steel mill using " EBT electric furnace with eccentric bottom → LF refining furnace → VD vacuum drying oven → continuous casting "
Skill produce gear 18CrMnBH steel, it is desirable that in be bundled into product nitrogen content be 0.010~0.015%.
When implementation, the charging of EBT electric furnace, molten iron allocation ratio 80%, remaining supplying steel scrap, electric power feeding time 15min, using normal
It advises technique and carries out deoxidation and alloying, argon bottom-blowing 20min, flow 200NL/min are cut LF furnace after complete analysis in place
Change pipeline bottom blowing nitrogen, bull ladle after flow 500NL/min, bottom blowing nitrogen 50min；Bottom blowing nitrogen, flow are VD furnace in place
300NL/min, vacuum time 30 minutes, after vacuum breaker, then quiet nitrogen blowing 15min, flow control switched in 200NL/min
Pipeline argon bottom-blowing, continuous casting on bull ladle after argon flow 150NL/min, argon bottom-blowing 20min use flow in continuous casting process
Protection pouring molten steel is carried out for the argon gas of 50NL/min；
In be bundled into product nitrogen content be 0.015%.
Embodiment 3
The present embodiment is smelter of certain steel mill using " EBT electric furnace with eccentric bottom → LF refining furnace → VD vacuum drying oven → continuous casting "
Skill produce gear 18CrMnBH steel, it is desirable that in be bundled into product nitrogen content be 0.010~0.015%.
When implementation, the charging of EBT electric furnace, molten iron allocation ratio 85%, remaining supplying steel scrap, electric power feeding time 10min, using normal
It advises technique and carries out deoxidation and alloying, argon bottom-blowing 17min, flow 350NL/min are cut LF furnace after complete analysis in place
Change pipeline bottom blowing nitrogen, bull ladle after flow 350NL/min, bottom blowing nitrogen 45min；Bottom blowing nitrogen, flow are VD furnace in place
250NL/min, vacuum time 25 minutes, after vacuum breaker, then quiet nitrogen blowing 10min, flow control switched in 120NL/min
Pipeline argon bottom-blowing, continuous casting on bull ladle after flow 120NL/min, argon bottom-blowing 15min；It is using flow in continuous casting process
The argon gas of 30NL/min carries out protection pouring molten steel；
In be bundled into product nitrogen content be 0.013%.
It should be noted last that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting.Although ginseng
It is described the invention in detail according to embodiment, it will be apparent to an ordinarily skilled person in the art that technical side of the invention
Case is modified or replaced equivalently, and without departure from the spirit and scope of technical solution of the present invention, should all be covered in the present invention
Scope of the claims in.
Claims (7)
1. a kind of increasing method for nitrogen of pinion steel 18CrMnBH, using " EBT electric furnace with eccentric bottom → LF refining furnace → VD vacuum drying oven → company
The smelting process of casting " produces gear 18CrMnBH steel, which is characterized in that and include the following steps:
(1) deoxidation and alloying are carried out using common process；
(2) 15~20min of argon bottom-blowing, flow are 200~500NL/min to LF furnace in place, switch pipeline bottom after a complete analysis
For nitrogen blowing until bull ladle, bottom blowing nitrogen flow is 200~500NL/min；
(3) VD furnace bottom blowing nitrogen in place, vacuum time 20~30 minutes, after vacuum breaker, quiet 5~15min of nitrogen blowing, flow control
In 50~200NL/min, then switch pipeline argon bottom-blowing, flow is 50~200NL/min, after 10~20min of argon bottom-blowing
Continuous casting on bull ladle.
2. the increasing method for nitrogen of pinion steel 18CrMnBH according to claim 1 a kind of, which is characterized in that LF furnace switches pipeline
The time of bottom blowing nitrogen is 40~50min.
3. the increasing method for nitrogen of pinion steel 18CrMnBH according to claim 1 a kind of, which is characterized in that the bottom blowing in place of VD furnace
Nitrogen, nitrogen flow are 200~300NL/min.
4. the increasing method for nitrogen of pinion steel 18CrMnBH according to claim 1 a kind of, which is characterized in that the charging of EBT electric furnace
In the process, 70% or more molten iron allocation ratio, remaining supplying steel scrap, 5~15min of electric power feeding time stablize electric furnace nitrogen content of molten steel.
5. the increasing method for nitrogen of pinion steel 18CrMnBH according to claim 1 a kind of, which is characterized in that make in continuous casting process
Protection pouring molten steel is carried out with the argon gas that flow is 10~50NL/min.
6. the increasing method for nitrogen of pinion steel 18CrMnBH according to claim 1 a kind of, which is characterized in that pinion steel
It is C:0.180~0.195% that 18CrMnBH steel grade, which requires chemical component mass percent,；Si:0.10~0.25%；Mn:1.33
~1.37%；P :≤0.025%；S:0.015~0.030%；Cr:1.23~1.27%；Ni:0.11~0.15%；Cu :≤
0.15%；B:0.0020~0.0030%；Al:0.020~0.040%；N:0.010~0.015%；Surplus is iron and can not keep away
The impurity exempted from.
7. the increasing method for nitrogen of pinion steel 18CrMnBH according to claim 6 a kind of, which is characterized in that meet the gear
The molten steel composition of a complete analysis is C:0.115~0.155% in the LF furnace of steel 18CrMnBH composition of steel；Si:0.10~
0.20%；Mn:1.15~1.25%；P :≤0.025%；S :≤0.025%；Cr:1.05~1.15%；Ni:0.10~
0.30%；Cu :≤0.20%；Al:0.020~0.055%；N:0.007~0.010%；Surplus be iron and inevitably it is miscellaneous
Matter.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110438291A (en) * | 2019-07-30 | 2019-11-12 | 石家庄钢铁有限责任公司 | A kind of control nitrogen method of carbonized Gear Steel |
| CN113106334A (en) * | 2021-03-11 | 2021-07-13 | 石家庄钢铁有限责任公司 | Steel for cycloidal gear of RV reducer and preparation method thereof |
| CN114250403A (en) * | 2021-12-20 | 2022-03-29 | 二重（德阳）重型装备有限公司 | Ingot casting method for enhancing self-diffusion, carbon manganese steel, 20SiMn steel and ingot casting method thereof |
| CN115612910A (en) * | 2021-07-16 | 2023-01-17 | 天津重型装备工程研究有限公司 | Nitrogen-controlled stainless steel smelting and ingot casting method for ultra-supercritical steam turbine rotor |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110438291A (en) * | 2019-07-30 | 2019-11-12 | 石家庄钢铁有限责任公司 | A kind of control nitrogen method of carbonized Gear Steel |
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| CN113106334A (en) * | 2021-03-11 | 2021-07-13 | 石家庄钢铁有限责任公司 | Steel for cycloidal gear of RV reducer and preparation method thereof |
| CN115612910A (en) * | 2021-07-16 | 2023-01-17 | 天津重型装备工程研究有限公司 | Nitrogen-controlled stainless steel smelting and ingot casting method for ultra-supercritical steam turbine rotor |
| CN115612910B (en) * | 2021-07-16 | 2023-11-14 | 天津重型装备工程研究有限公司 | Nitrogen-controlled stainless steel smelting ingot casting method for ultra-supercritical steam turbine rotor |
| CN114250403A (en) * | 2021-12-20 | 2022-03-29 | 二重（德阳）重型装备有限公司 | Ingot casting method for enhancing self-diffusion, carbon manganese steel, 20SiMn steel and ingot casting method thereof |
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