CN106591682A - Method for smelting high-nitrogen steel in two steps under normal pressure - Google Patents
Method for smelting high-nitrogen steel in two steps under normal pressure Download PDFInfo
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- CN106591682A CN106591682A CN201611096538.2A CN201611096538A CN106591682A CN 106591682 A CN106591682 A CN 106591682A CN 201611096538 A CN201611096538 A CN 201611096538A CN 106591682 A CN106591682 A CN 106591682A
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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
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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
Abstract
The invention discloses a method for smelting high-nitrogen steel in two steps under a normal pressure. The method includes the following steps that S1, steel block rust removing is performed; S2, steel block cleaning is performed; S3, molten steel smelting is performed; S4, the first step of high-nitrogen steel smelting is performed, when the temperature in an electric arc furnace or an induction smelting furnace is risen to 1600 DEG C, stirring stops, manganese nitride is added into molten steel, the ratio of manganese to nitrogen in the manganese nitride is 12: 88, after the manganese nitride is added, mixed liquid of the molten steel and the manganese nitride is stirred, the rotating speed of an engine at the moment is 2000 r/min, and when the molten steel and the manganese nitride are completely fused, stirring stops; S5, the second step of high-nitrogen steel smelting is performed, the molten steel and the manganese nitride which are completely fused are transferred into a VD furnace, nitrogen gas is filled into the bottom of the VD furnace, and the VD furnace is subjected to the vacuum treatment process; and S6, high-nitrogen steel casting is performed. The method is simple in production process, the steps are simplified, resources and time can be effectively saved in the production process, and therefore good high-nitrogen steel can be smelted.
Description
Technical field
The present invention relates to high nitrogen steel smelting process field, the method for two step smelting high-nitrogen steels under specially a kind of normal pressure.
Background technology
Nitrogen content exceedes the nitrogenous steel of solubility limit under atmospheric pressure and is referred to as high nitrogen steel.Compared with conventional steel grade, high nitrogen steel
Performance, quality have significant improvement.It has good toughness, and has high intensity, corrosion resistance, wear resistance concurrently,
Croop property and fatigue strength are also obviously improved.In the eighties in 20th century, foreign countries develop in succession high pressure plasma arc melting, increase
The high nitrogen steel smelting techniques such as pressure electroslag remelting process, Counter pressure casting method and powder metallurgy, but China's work in this respect is relative
It is relatively backward.High nitrogen steel has excellent mechanical property, good decay resistance, thus is subject to extensive attention both domestic and external.
Or it is to be filled with nitrogen that high nitrogen steel of the prior art is smelted, or being to be directly placed into the metal containing nitrogen,
And the process smelted is comparatively laborious, and smelting process needs the state of the non-normal pressure for being maintained at certain, does not have during smelting
Have and make full use of discarded metal, be unfavorable for realizing the effectively utilizes of resource.
The content of the invention
It is an object of the invention to provide under a kind of normal pressure two step smelting high-nitrogen steels method, to solve above-mentioned background technology
The problem of middle proposition.
For achieving the above object, the present invention provides following technical scheme：A kind of method of two step smelting high-nitrogen steels under normal pressure,
Comprise the following steps：
S1：Bloom eliminates rust, and discarded bloom is uniformly cut, and is placed in eliminating rust in groove, into rust cleaning groove pours rust removing solution and water into,
And rust removing solution and water are completely soaked bloom, soak time is 1-3 hours, keeps water temperature to be that 22-34 is Celsius during immersion
Degree；
S2：Bloom is cleaned, and the bloom after rust cleaning is clamped with hoisting fixture, and bloom is lifted to apart from horizontal plane 50-160
Centimeters, the outlet pipe of giant is connected with cleaning liquid bath, and enters horizontal high voltage punching to the surface of bloom using giant
Wash, the number of times of flushing is no less than 2 times, and the time rinsed every time is 8-13 minutes；
S3：Smelting molten steel, cleaned bloom is put in electric arc furnace or sense melt furnace and is refined, electric arc furnace or sense melt furnace
Interior temperature is 1518-1540 degree Celsius, when the bloom in electric arc furnace or sense melt furnace just becomes molten steel, by electric arc
Temperature in stove or sense melt furnace is increased to 1560-1600 degree Celsius, and molten steel is stirred using mixing plant, wherein stirring
The metal mixed used by the paddle in machine is molybdenum or tungsten, and in blender, the rotating speed of electromotor is 1200r/min；
S4：High nitrogen steel smelts the first step, when the temperature in electric arc furnace or sense melt furnace is increased to 1600 degrees Celsius, stops
Stirring, and nitrogenized manganese is added into molten steel, in nitrogenized manganese, the ratio of manganese and nitrogen is nitrogen：Manganese=12:88, it is right again after addition nitrogenized manganese
The conjunction liquid of molten steel and nitrogenized manganese is stirred, and now the rotating speed of electromotor is 2000r/min, treats that molten steel and nitrogenized manganese melt completely
Close, stop stirring；
S5：High nitrogen steel smelts second step, the molten steel for merging completely and nitrogenized manganese is transferred in VD stoves, and is filled with to VD furnace bottoms
Nitrogen, in VD stove vacuum process, bottom blowing nitrogen pressure is 0.25MPa-0.75MPa, and flow is 130-360 liter/min；
After the application of vacuum terminates, bottom blowing nitrogen pressure is 0.10MPa-0.20MPa, and flow is 19-76 liter/min；
S6：High nitrogen steel is poured, and the smelting liquid of molten steel, nitrogenized manganese and nitrogen is transferred in bull ladle by conduit, is provided with conduit
No less than 2 filter screens, the size of aperture of filter screen is sequentially reduced according to the direction of VD stoves to bull ladle, the smelting liquid in bull ladle again according to
It is secondary casting mold is delivered to by driving to be poured.
Preferably, in step S1, the ratio of rust removing solution and water is rust removing solution：Water=2:1.
Preferably, in the step S6 pore diameter range of filter screen between 0.08-0.9cm.
Preferably, model DW-0951V-1 of the step S2 high-pressure gun, and the chucking power of hoisting fixture is more than
2000N。
Compared with prior art, the invention has the beneficial effects as follows：The present invention is made by using discarded bloom smelting molten steel
The bloom that must be discarded is fully utilized, and reaches the effect of the effectively utilizes of resource；The process of smelting only needs two steps, first puts into
Nitrogenized manganese, recycles nitrogen to protect, reaches efficient, quick commercial production effect；By last filtration stage, by diameter
Waste residue more than 0.9 is filtered completely, produces high-quality high nitrogen steel.Simple production process of the present invention, step are simplified, in the mistake of production
The effective save resources of Cheng Zhongneng and time, so as to smelt preferably high nitrogen steel.
Specific embodiment
Technical scheme in the embodiment of the present invention will be clearly and completely described below, it is clear that described enforcement
Example is only a part of embodiment of the invention, rather than the embodiment of whole.Based on the embodiment in the present invention, this area is common
The every other embodiment obtained under the premise of creative work is not made by technical staff, belongs to the model of present invention protection
Enclose.
Embodiment one
The present invention provides a kind of technical scheme：Under a kind of normal pressure, the method for two step smelting high-nitrogen steels, comprises the following steps：
S1：Bloom eliminates rust, and discarded bloom is uniformly cut, and is placed in eliminating rust in groove, into rust cleaning groove pours rust removing solution and water into,
The ratio of rust removing solution and water is rust removing solution：Water=2:1, and rust removing solution and water are completely soaked bloom, soak time is 1 hour, leaching
Water temperature is kept to be 22 degrees Celsius during bubble；
S2：Bloom is cleaned, and the bloom after rust cleaning is clamped with hoisting fixture, and bloom is lifted to apart from 50 centimetres of horizontal plane
Place, the outlet pipe of giant is connected with cleaning liquid bath, and carries out high pressure rinse to the surface of bloom using giant, high
Model DW-0951V-1 of pressure hydraulic giant, and the chucking power of hoisting fixture is 2000N, the number of times of flushing is 2 times, and is rinsed every time
Time be 8 minutes；
S3：Smelting molten steel, cleaned bloom is put in electric arc furnace or sense melt furnace and is refined, electric arc furnace or sense melt furnace
Interior temperature is 1518 degrees Celsius, when the bloom in electric arc furnace or sense melt furnace just becomes molten steel, by electric arc furnace or
Temperature in sense melt furnace is increased to 1560 degrees Celsius, and molten steel is stirred using mixing plant, wherein in blender
Metal used by paddle is molybdenum or tungsten, and in blender, the rotating speed of electromotor is 1200r/min；
S4：High nitrogen steel smelts the first step, when the temperature in electric arc furnace or sense melt furnace is increased to 1600 degrees Celsius, stops
Stirring, and nitrogenized manganese is added into molten steel, in nitrogenized manganese, the ratio of manganese and nitrogen is nitrogen：Manganese=12:88, it is right again after addition nitrogenized manganese
The conjunction liquid of molten steel and nitrogenized manganese is stirred, and now the rotating speed of electromotor is 2000r/min, treats that molten steel and nitrogenized manganese melt completely
Close, stop stirring；
S5：High nitrogen steel smelts second step, the molten steel for merging completely and nitrogenized manganese is transferred in VD stoves, and is filled with to VD furnace bottoms
Nitrogen, in VD stove vacuum process, bottom blowing nitrogen pressure is 0.25MPa, and flow is 130 liters/min；The application of vacuum
After end, bottom blowing nitrogen pressure is 0.10MPa, and flow is 19 liters/min；
S6：High nitrogen steel is poured, and the smelting liquid of molten steel, nitrogenized manganese and nitrogen is transferred in bull ladle by conduit, is provided with conduit
No less than 2 filter screens, the size of aperture of filter screen is sequentially reduced according to the direction of VD stoves to bull ladle, and the aperture of filter screen is 0.08cm,
Smelting liquid in bull ladle is delivered to casting mold by driving successively again and is poured.
Embodiment two
The present invention provides a kind of technical scheme：Under a kind of normal pressure, the method for two step smelting high-nitrogen steels, comprises the following steps：
S1：Bloom eliminates rust, and discarded bloom is uniformly cut, and is placed in eliminating rust in groove, into rust cleaning groove pours rust removing solution and water into,
The ratio of rust removing solution and water is rust removing solution：Water=2:1, and rust removing solution and water are completely soaked bloom, soak time is 3 hours, leaching
Water temperature is kept to be 34 degrees Celsius during bubble；
S2：Bloom is cleaned, and the bloom after rust cleaning is clamped with hoisting fixture, and bloom is lifted to apart from 160 lis of horizontal plane
At rice, the outlet pipe of giant is connected with cleaning liquid bath, and high pressure rinse is carried out to the surface of bloom using giant,
Model DW-0951V-1 of giant, and the chucking power of hoisting fixture is 3000N, the number of times of flushing is 4 times, and is rushed every time
The time washed is 13 minutes；
S3：Smelting molten steel, cleaned bloom is put in electric arc furnace or sense melt furnace and is refined, electric arc furnace or sense melt furnace
Interior temperature is 1540 degrees Celsius, when the bloom in electric arc furnace or sense melt furnace just becomes molten steel, by electric arc furnace or
Temperature in sense melt furnace is increased to 1600 degrees Celsius, and molten steel is stirred using mixing plant, wherein in blender
Metal used by paddle is molybdenum or tungsten, and in blender, the rotating speed of electromotor is 1200r/min；
S4：High nitrogen steel smelts the first step, when the temperature in electric arc furnace or sense melt furnace is increased to 1600 degrees Celsius, stops
Stirring, and nitrogenized manganese is added into molten steel, in nitrogenized manganese, the ratio of manganese and nitrogen is nitrogen：Manganese=12:88, it is right again after addition nitrogenized manganese
The conjunction liquid of molten steel and nitrogenized manganese is stirred, and now the rotating speed of electromotor is 2000r/min, treats that molten steel and nitrogenized manganese melt completely
Close, stop stirring；
S5：High nitrogen steel smelts second step, the molten steel for merging completely and nitrogenized manganese is transferred in VD stoves, and is filled with to VD furnace bottoms
Nitrogen, in VD stove vacuum process, bottom blowing nitrogen pressure is 0.75MPa, and flow is 360 liters/min；The application of vacuum
After end, bottom blowing nitrogen pressure is 0.20MPa, and flow is 76 liters/min；
S6：High nitrogen steel is poured, and the smelting liquid of molten steel, nitrogenized manganese and nitrogen is transferred in bull ladle by conduit, is provided with conduit
No less than 2 filter screens, the size of aperture of filter screen is sequentially reduced according to the direction of VD stoves to bull ladle, and the aperture of filter screen is 0.9cm,
Smelting liquid in bull ladle is delivered to casting mold by driving successively again and is poured.
Embodiment three
The present invention provides a kind of technical scheme：Under a kind of normal pressure, the method for two step smelting high-nitrogen steels, comprises the following steps：
S1：Bloom eliminates rust, and discarded bloom is uniformly cut, and is placed in eliminating rust in groove, into rust cleaning groove pours rust removing solution and water into,
The ratio of rust removing solution and water is rust removing solution：Water=2:1, and rust removing solution and water are completely soaked bloom, soak time is 2 hours, leaching
Water temperature is kept to be 31 degrees Celsius during bubble；
S2：Bloom is cleaned, and the bloom after rust cleaning is clamped with hoisting fixture, and bloom is lifted to apart from 100 lis of horizontal plane
At rice, the outlet pipe of giant is connected with cleaning liquid bath, and high pressure rinse is carried out to the surface of bloom using giant,
Model DW-0951V-1 of giant, and the chucking power of hoisting fixture is 2500N, the number of times of flushing is 3 times, and is rushed every time
The time washed is 9 minutes；
S3：Smelting molten steel, cleaned bloom is put in electric arc furnace or sense melt furnace and is refined, electric arc furnace or sense melt furnace
Interior temperature is 1524 degrees Celsius, when the bloom in electric arc furnace or sense melt furnace just becomes molten steel, by electric arc furnace or
Temperature in sense melt furnace is increased to 1578 degrees Celsius, and molten steel is stirred using mixing plant, wherein in blender
Metal used by paddle is molybdenum or tungsten, and in blender, the rotating speed of electromotor is 1200r/min；
S4：High nitrogen steel smelts the first step, when the temperature in electric arc furnace or sense melt furnace is increased to 1600 degrees Celsius, stops
Stirring, and nitrogenized manganese is added into molten steel, in nitrogenized manganese, the ratio of manganese and nitrogen is nitrogen：Manganese=12:88, it is right again after addition nitrogenized manganese
The conjunction liquid of molten steel and nitrogenized manganese is stirred, and now the rotating speed of electromotor is 2000r/min, treats that molten steel and nitrogenized manganese melt completely
Close, stop stirring；
S5：High nitrogen steel smelts second step, the molten steel for merging completely and nitrogenized manganese is transferred in VD stoves, and is filled with to VD furnace bottoms
Nitrogen, in VD stove vacuum process, bottom blowing nitrogen pressure is 0.66MPa, and flow is 220 liters/min；The application of vacuum
After end, bottom blowing nitrogen pressure is 0.19MPa, and flow is 56 liters/min；
S6：High nitrogen steel is poured, and the smelting liquid of molten steel, nitrogenized manganese and nitrogen is transferred in bull ladle by conduit, is provided with conduit
No less than 2 filter screens, the size of aperture of filter screen is sequentially reduced according to the direction of VD stoves to bull ladle, and the aperture of filter screen is 0.1cm,
Smelting liquid in bull ladle is delivered to casting mold by driving successively again and is poured.
The present invention is by using discarded bloom smelting molten steel so that discarded bloom is fully utilized, and reaches money
The effect of the effectively utilizes in source；The process of smelting only needs two steps, first puts into nitrogenized manganese, recycles nitrogen to protect, reach efficiently,
Quick commercial production effect；By last filtration stage, the waste residue with diameter greater than 0.9 is filtered completely, produced high-quality
High nitrogen steel.Simple production process of the present invention, step are simplified, the effective save resources of energy and time during production, so as to
Smelt preferably high nitrogen steel.
Although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
Understanding can carry out various changes, modification, replacement to these embodiments without departing from the principles and spirit of the present invention
And modification, the scope of the present invention be defined by the appended.
Claims (4)
1. under a kind of normal pressure two step smelting high-nitrogen steels method, it is characterised in that：Comprise the following steps：
S1：Bloom eliminates rust, and discarded bloom is uniformly cut, and is placed in eliminating rust in groove, into rust cleaning groove pours rust removing solution and water into,
And rust removing solution and water are completely soaked bloom, soak time is 1-3 hours, keeps water temperature to be that 22-34 is Celsius during immersion
Degree；
S2：Bloom is cleaned, and the bloom after rust cleaning is clamped with hoisting fixture, and bloom is lifted to apart from horizontal plane 50-160
Centimeters, the outlet pipe of giant is connected with cleaning liquid bath, and enters horizontal high voltage punching to the surface of bloom using giant
Wash, the number of times of flushing is no less than 2 times, and the time rinsed every time is 8-13 minutes；
S3：Smelting molten steel, cleaned bloom is put in electric arc furnace or sense melt furnace and is refined, electric arc furnace or sense melt furnace
Interior temperature is 1518-1540 degree Celsius, when the bloom in electric arc furnace or sense melt furnace just becomes molten steel, by electric arc
Temperature in stove or sense melt furnace is increased to 1560-1600 degree Celsius, and molten steel is stirred using mixing plant, wherein stirring
The metal mixed used by the paddle in machine is molybdenum or tungsten, and in blender, the rotating speed of electromotor is 1200r/min；
S4：High nitrogen steel smelts the first step, when the temperature in electric arc furnace or sense melt furnace is increased to 1600 degrees Celsius, stops
Stirring, and nitrogenized manganese is added into molten steel, in nitrogenized manganese, the ratio of manganese and nitrogen is nitrogen：Manganese=12:88, it is right again after addition nitrogenized manganese
The conjunction liquid of molten steel and nitrogenized manganese is stirred, and now the rotating speed of electromotor is 2000r/min, treats that molten steel and nitrogenized manganese melt completely
Close, stop stirring；
S5：High nitrogen steel smelts second step, the molten steel for merging completely and nitrogenized manganese is transferred in VD stoves, and is filled with to VD furnace bottoms
Nitrogen, in VD stove vacuum process, bottom blowing nitrogen pressure is 0.25MPa-0.75MPa, and flow is 130-360 liter/min；
After the application of vacuum terminates, bottom blowing nitrogen pressure is 0.10MPa-0.20MPa, and flow is 19-76 liter/min；
S6：High nitrogen steel is poured, and the smelting liquid of molten steel, nitrogenized manganese and nitrogen is transferred in bull ladle by conduit, is provided with conduit
No less than 2 filter screens, the size of aperture of filter screen is sequentially reduced according to the direction of VD stoves to bull ladle, the smelting liquid in bull ladle again according to
It is secondary casting mold is delivered to by driving to be poured.
2. under a kind of normal pressure according to claim 1 two step smelting high-nitrogen steels method, it is characterised in that：Step S1
The ratio of middle rust removing solution and water is rust removing solution：Water=2:1.
3. under a kind of normal pressure according to claim 1 two step smelting high-nitrogen steels method, it is characterised in that：Step S6
The pore diameter range of middle filter screen is between 0.08-0.9cm.
4. under a kind of normal pressure according to claim 1 two step smelting high-nitrogen steels method, it is characterised in that：Step S2
Model DW-0951V-1 of high-pressure gun, and the chucking power of hoisting fixture is more than 2000N.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107619984A (en) * | 2017-09-30 | 2018-01-23 | 徐州众工精密模锻有限公司 | A kind of production method of high pressure smelting high-nitrogen steel |
| WO2018107315A1 (en) * | 2016-12-12 | 2018-06-21 | 孙瑞涛 | Two-step method for smelting high-nitrogen steel at normal pressure |
| CN110343815A (en) * | 2018-04-08 | 2019-10-18 | 吉林常春高氮合金研发中心有限公司 | A method of improving useless high nitrogen steel mechanical property |
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| JPH0790471A (en) * | 1993-09-17 | 1995-04-04 | Nippon Steel Corp | High mn and high n austenitic stainless steel cast slab and its production |
| CN1348746A (en) * | 2000-10-13 | 2002-05-15 | 郭晓勤 | Condom with Chinese medicine bactericide |
| CN201516304U (en) * | 2009-09-10 | 2010-06-30 | 桐昆集团股份有限公司 | Waste residue filtering and recovering device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018107315A1 (en) * | 2016-12-12 | 2018-06-21 | 孙瑞涛 | Two-step method for smelting high-nitrogen steel at normal pressure |
| CN107619984A (en) * | 2017-09-30 | 2018-01-23 | 徐州众工精密模锻有限公司 | A kind of production method of high pressure smelting high-nitrogen steel |
| CN110343815A (en) * | 2018-04-08 | 2019-10-18 | 吉林常春高氮合金研发中心有限公司 | A method of improving useless high nitrogen steel mechanical property |
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Address after: Jiaozhou City, Shandong province 266300 Qingdao City Huiying economic and Technological Development Zone, South First Street Applicant after: Qingdao Branch Co., Ltd. of Mechanical Science Research Institute Address before: Jiaozhou City, Shandong province 266300 Qingdao City Huiying economic and Technological Development Zone, South First Street Applicant before: Qingdao Branch of General Research Institute of Mechanical Science |
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Address after: 266300 South Head of Huiying Street, Jiaozhou Economic and Technological Development Zone, Qingdao City, Shandong Province Patentee after: China National Academy of Machinery Group Qingdao Branch Co.,Ltd. Address before: 266300 South Head of Huiying Street, Jiaozhou Economic and Technological Development Zone, Qingdao City, Shandong Province Patentee before: Qingdao Branch Co., Ltd. of Mechanical Science Research Institute |