CN106756436A - The production method of gas valve steel 42Cr9Si2 wire rods - Google Patents
The production method of gas valve steel 42Cr9Si2 wire rods Download PDFInfo
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- CN106756436A CN106756436A CN201611078909.4A CN201611078909A CN106756436A CN 106756436 A CN106756436 A CN 106756436A CN 201611078909 A CN201611078909 A CN 201611078909A CN 106756436 A CN106756436 A CN 106756436A
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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
-
- 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
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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
- C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a kind of production method of gas valve steel 42Cr9Si2 wire rods, it includes the pretreatment of alloying ferrosilicon, AOD furnace smelting, the refining of LF stoves, continuous casting, rolling and annealing operation；Alloying ferrosilicon pretreatment process：Alloying ferrosilicon is toasted；The AOD furnace smelting procedure：Whole Argon, the recovery time is more than 8 minutes.This method toasts the moisture in removal alloy material by alloy material, reduces the molten steel gas content after alloy material is added, it is ensured that relatively low final gas content.
Description
Technical field
The present invention relates to a kind of production method of Valve Steel, especially a kind of producer of gas valve steel 42Cr9Si2 wire rods
Method.
Background technology
42Cr9Si2 is to manufacture petrol engine and the maximum air valve Steel material of Diesel engine inlet and outlet valve consumption,
It is the critical material in whole engine, it is very big in the importance of traffic field of power machinery.The production of gas valve steel is special
It is a professional very strong field in steel, although quantity is not very big, but its condition of work is severe, generally all in high temperature, height
Worked under conditions of pressure, height are washed away and height is denuded, thus it is higher to the performance requirement of gas valve steel.GB《Diesel Engine's Air Valve is used
Steel and alloy bar material》（GBT 12773-2008）In have to the composition of gas valve steel, grain size, field trash, heat treatment performance
Clear stipulaties, wherein the requirement to field trash is strict.Occurring molten steel oxygen, hydrogen in existing production method, smelting process to contain more
The problems such as measuring exceeded, field trash is not up to standard.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of gas valve steel 42Cr9Si2 that can efficiently reduce field trash
The production method of wire rod.
In order to solve the above technical problems, the technical solution used in the present invention is：It include alloying ferrosilicon pretreatment,
AOD furnace smelting, the refining of LF stoves, continuous casting, rolling and annealing operation；Alloying ferrosilicon pretreatment process：Alloying ferrosilicon is entered
Row baking；The AOD furnace smelting procedure：Whole Argon, the recovery time is more than 8 minutes.
Temperature >=200 DEG C of baking of the present invention, time >=120 minute.
LF stoves refining procedure of the present invention：Molten steel enters LF stokeholds carries out deslagging, it is ensured that thickness of slag layer≤50mm；During slag making
High basicity slag, basicity of slag >=3.0 are made using lime plus bauxite.
Rolling process of the present invention：1130 DEG C~1140 DEG C of soaking zone temperature；Enter 900~950 DEG C of final rolling temperature, spin
860~900 DEG C of temperature.In the rolling process, steel billet preheating temperature≤850 DEG C, 1120~1150 DEG C of bringing-up section temperature.It is described
In rolling process, time inside furnace is 120~180min.
Annealing operation of the present invention：880 DEG C ± 5 DEG C of holding temperature, soaking time 4 ± 0.5 hours；Controlled after insulation cold
But speed is 25 DEG C~35 DEG C/h.
It is using the beneficial effect produced by above-mentioned technical proposal：The present invention is toasted in removal alloy material by alloy material
Moisture, reduce alloy material add after molten steel gas content, it is ensured that relatively low final gas content.
Specific embodiment
The production method of this gas valve steel 42Cr9Si2 wire rods includes the pretreatment of alloying ferrosilicon, AOD furnace smelting, LF stoves essence
Refining, continuous casting, rolling and annealing operation, the technique of each operation are as described below：
（1）Alloying ferrosilicon pretreatment process：Generally comprise moisture in alloying ferrosilicon, smelting process can cause molten steel oxygen,
Hydrogen content overproof.This method is gas content in reduction molten steel, before dephosphorization, off-line baking technology is used to alloy material.
Moisture in removal alloy material is toasted by alloy material, the molten steel gas content after alloy material is added is reduced, it is ensured that be relatively low final
Gas content.Process is：Alloying ferrosilicon is put into standby ladle before dephosphorization, in the baking of baking position, surface water is removed
Point；Baking temperature >=200 DEG C, time >=120 minute.
（2）AOD furnace smelting procedure：By whole Argon in AOD smelting processes, oxygen content is reduced to control field trash,
Recovery time ＞ 8 minutes；AOD skims before tapping.
（3）LF stove refining procedures：Entering LF stokeholds carries out deslagging, it is ensured that thickness of slag layer≤50mm, is easy to make high basicity slag.
In LF stove smelting processes, oxygen content is controlled by high basicity slag, the slag making of LF stoves adds bauxite to make high basicity slag using lime, while
Ensure the mobility of slag, basicity of slag >=3.0；Slag main component：CaO 40~50wt%, Al2O315~25wt%, SiO210~
15wt%.Deoxidation makes white slag using aluminum shot+calcium carbide, and the mobility of slag is kept while high alkalinity is ensured.
（4）Continuous casting working procedure：Conticaster stopper rod Argon, controls Argon 5~50NL/h of amount, using weak cold technique, it is ensured that strand
Good macrostructure.
（5）Rolling process：By rational heating-up temperature and operation of rolling temperature in the operation of rolling, it is ensured that good after rolling
Surface quality and tissue size.Technical process is：A, heating process：Steel billet preheating temperature≤850 DEG C, heating steel billet section temperature
1120~1150 DEG C, 1130~1140 DEG C of soaking zone temperature, 120~180min of time inside furnace；B, the operation of rolling：De-scaling water is opened
Open, steel billet rolled during 6+6 passages are thick, and the pre- finish rolling of 6 passages, 8 passage finish rolling, 4 passages subtract fixed diameter rolling, enter final rolling temperature 900
~950 DEG C, 860~900 DEG C of laying temperature；C, cooling procedure：Rear steyr not cooling line is rolled, air-cooled line stay-warm case and wind is adjusted
Machine aperture uses 2~4 DEG C/s of cooling velocity.
（6）Annealing operation：Using high temperature and by the way of being incubated, wire rod intensity is reduced, while to control soaking time and cold
But speed, it is ensured that crystal grain is not roughened, it is ensured that crystal grain is more than 8 grades, while to ensure hardness HB≤269.Technical process is：Insulation
880 DEG C ± 5 DEG C of temperature, soaking time 4 ± 0.5 hours；Control cold 25 DEG C of the cooling velocity of stove is finished using retarded cooling process, i.e. insulation
~35 DEG C/h, air cooling of being come out of the stove after being cooled to 550~600 DEG C.
Embodiment 1：The production method of this gas valve steel 42Cr9Si2 wire rods uses following concrete technologies.
Alloying ferrosilicon is toasted before dephosphorization of molten iron, with 323 DEG C of hand-held infrared radiation thermometer measurement temperature, dephosphorization time
63 minutes, 58 tons of ladle molten steel amount, AOD smelting processes 72 minutes, alloy material baking time was at 135 minutes.AOD furnace is smelted complete
Journey Argon, 9 minutes recovery times.Deslagging, thickness of slag layer 42mm are first carried out to ladle before entering refining furnace；LF stoves are with addition of 100kg stones
Ash, 200kg bauxite slag making；After dipping in slag deoxidation operation is carried out with addition of 30kg calcium carbide and 4kg aluminum shots；Process slag is diluter, subsequently
Altogether basicity, final basicity 3.51 are adjusted with addition of 240kg lime.Continuous casting uses weak cold technique, 1500~1600L/ of crystallizer water
Min, Argon amount 35NL/h.
Steel billet is heated in heating furnace, 820 DEG C of preheating temperature, 1142 DEG C of bringing-up section temperature, 1138 DEG C of soaking zone temperature,
Time inside furnace 150min.Steel billet is rolled into wire rod through fast mill, enters 910 DEG C of final rolling temperature, 870 DEG C of coiling temperature.Roll rear line
Material enters steyr not cooling line, and regulation air-cooled line stay-warm case opens quantity and blower fan aperture cooling velocity is 3 DEG C/s.Wire rod enters
Anneal, 878 DEG C of holding temperature, soaking time 4 hours, 30 DEG C/h of cooling velocity, sky of being come out of the stove after being cooled to 600 DEG C
It is cold.
The 42Cr9Si2 wire rods of the present embodiment gained Φ 10mm specifications, oxygen content 0.0014wt%, nitrogen content 0.0082wt%,
Hydrogen content 0%；Surface quality is good, 9 grades of grain size, annealing material hardness HB252, field trash B 0.5, D 1.0, D 0.5e；Wire rod
Low power, center porosity 1.5, General Loosen 1.5, pattern segregation 1.5；Wire rod lumber recovery 98.5%, qualification rate 100%.
Embodiment 2：The production method of this gas valve steel 42Cr9Si2 wire rods uses following concrete technologies.
Alloying ferrosilicon is toasted before dephosphorization of molten iron, with 323 DEG C of hand-held infrared radiation thermometer measurement temperature, dephosphorization time
61 minutes, 58 tons of ladle molten steel amount, AOD smelting processes 70 minutes, alloy material baking time was at 131 minutes.AOD furnace is smelted whole
Argon, 10 minutes recovery times.Deslagging, thickness of slag layer 42mm are first carried out to ladle before entering refining furnace；LF stoves are with addition of 100kg stones
Ash, 200kg bauxite slag making, slag main component（wt）：CaO 47.5%, Al2O317.6%, SiO212.3%；Dip in after slag with addition of
30kg calcium carbide and 4kg aluminum shots carry out deoxidation operation；Process slag is diluter, follow-up to adjust basicity, final alkali with addition of 240kg lime altogether
Degree 3.3.Continuous casting uses weak cold technique crystallizer, 1500~1600L/min of water, Argon amount 20NL/h.
Steel billet is heated in heating furnace, 840 DEG C of preheating section temperature, 1135 DEG C of heating-up temperature, 1140 DEG C of soaking temperature,
Stove time 155min.Steel billet is rolled into wire rod through fast mill, enters 915 DEG C of final rolling temperature, 890 DEG C of coiling temperature.Wire rod enters
Steyr not cooling line, regulation air-cooled line stay-warm case opens quantity and blower fan aperture, and cooling velocity is 2 DEG C/s.Wire rod is annealed
Furnace annealing, 882 DEG C of holding temperature, soaking time 4 hours, 32 DEG C/h of cooling velocity, air cooling of being come out of the stove after being cooled to 580 DEG C.
The 42Cr9Si2 wire rods of the present embodiment gained Φ 11mm specifications, oxygen content 0.0019wt%, nitrogen content 0.0083wt%,
Hydrogen content 0.00003wt%；Surface quality is good, 9 grades of grain size, annealing material hardness HB243, field trash A 0.5, D 1.5, D
0.5e；Wire rod low power, center porosity 0.5, General Loosen 0.5, pattern segregation 0；Wire rod lumber recovery 98.7%, qualification rate 100%.
Embodiment 3：The production method of this gas valve steel 42Cr9Si2 wire rods uses following concrete technologies.
Alloying ferrosilicon is toasted before dephosphorization of molten iron, with 323 DEG C of hand-held infrared radiation thermometer measurement temperature, dephosphorization time
63 minutes, 58 tons of ladle molten steel amount, AOD smelting processes 72 minutes, alloy material baking time was at 135 minutes.AOD smelts whole process and blows
Argon, 9 minutes recovery times.Deslagging, thickness of slag layer 45mm are first carried out to ladle before entering refining furnace；LF stoves with addition of 100kg lime,
200kg bauxite slag making；After dipping in slag deoxidation operation is carried out with addition of 30kg calcium carbide and 4kg aluminum shots；Process slag is diluter, subsequently matches somebody with somebody altogether
Plus 240kg lime adjustment basicity, final basicity 3.4.Continuous casting uses weak cold technique crystallizer, 1500~1600L/min of water to blow
Argon amount 50NL/h.
Steel billet is heated in heating furnace, 850 DEG C of preheating section temperature, 1140 DEG C of heating-up temperature, 1137 DEG C of soaking temperature,
Stove time 150min.Steel billet is rolled into wire rod through fast mill, enters 900 DEG C of final rolling temperature, 860 DEG C of coiling temperature.Wire rod enters
Steyr not cooling line, regulation air-cooled line stay-warm case opens quantity and blower fan aperture cooling velocity is 2 DEG C/s.The annealed stove of wire rod
Annealing, 875 DEG C of holding temperature, soaking time 4 hours, 32 DEG C/h of cooling velocity, air cooling of being come out of the stove after being cooled to 570 DEG C.
The wire rod of the present embodiment gained Φ 12mm specifications, oxygen content 0.0012wt%, nitrogen content 0.0103wt%, hydrogen content
0.00004wt%；Surface quality is good, 9 grades of grain size, annealing material hardness HB236, field trash A 0.5, D 1.5, D 0.5e；Line
Material low power, center porosity 0.5, General Loosen 0.5, pattern segregation 0.5；Wire rod lumber recovery 98.3%, qualification rate 100%.
Embodiment 4：The production method of this gas valve steel 42Cr9Si2 wire rods uses following concrete technologies.
Alloying ferrosilicon is toasted before dephosphorization of molten iron, is toasted 140 minutes at 255 DEG C.58 tons of ladle molten steel amount, AOD
Smelt whole Argon, 8.5 minutes recovery times.Deslagging, thickness of slag layer 44mm are first carried out to ladle before entering refining furnace；LF stoves with addition of
100kg lime, 200kg bauxite slag making；After dipping in slag deoxidation operation is carried out with addition of 30kg calcium carbide and 4kg aluminum shots；Process slag compared with
It is dilute, it is follow-up to adjust basicity, final basicity 3.3 with addition of lime altogether.Continuous casting uses weak cold technique crystallizer, 1500~1600L/ of water
Min, Argon amount 30NL/h.
Steel billet is heated in heating furnace, 830 DEG C of preheating section temperature, 1120 DEG C of heating-up temperature, 1135 DEG C of soaking temperature,
Stove time 180min.Steel billet is rolled into wire rod through fast mill, enters 930 DEG C of final rolling temperature, 900 DEG C of coiling temperature.Wire rod enters
Steyr not cooling line, regulation air-cooled line stay-warm case opens quantity and blower fan aperture cooling velocity is 3 DEG C/s.The annealed stove of wire rod
Annealing, 880 DEG C of holding temperature, soaking time 4.5 hours, 28 DEG C/h of cooling velocity, air cooling of being come out of the stove after being cooled to 550 DEG C.
The wire rod of the present embodiment gained Φ 12mm specifications, oxygen content 0.0012wt%, nitrogen content 0.0105wt%, hydrogen content
0.00006wt%；Surface quality is good, 9 grades of grain size, annealing material hardness HB225, field trash A 0.5, D 1.5, D 0.5e；Line
Material low power, center porosity 1.0, General Loosen 1.0, pattern segregation 0.5；Wire rod lumber recovery 98.5%, qualification rate 100%.
Embodiment 5：The production method of this gas valve steel 42Cr9Si2 wire rods uses following concrete technologies.
Alloying ferrosilicon is toasted before dephosphorization of molten iron, is toasted 120 minutes at 280 DEG C.The 58 tons of AOD smeltings of ladle molten steel amount
The whole Argon of refining, 9.5 minutes recovery times.Deslagging, thickness of slag layer 50mm are first carried out to ladle before entering refining furnace；LF stoves with addition of
100kg lime, 200kg bauxite slag making；After dipping in slag deoxidation operation is carried out with addition of 30kg calcium carbide and 4kg aluminum shots；Process slag compared with
It is dilute, it is follow-up to adjust basicity, final basicity 3.0 with addition of lime altogether.Continuous casting uses weak cold technique crystallizer, 1500~1600L/ of water
Min, Argon amount 15NL/h.
Steel billet is heated in heating furnace, 840 DEG C of preheating section temperature, 1150 DEG C of heating-up temperature, 1133 DEG C of soaking temperature,
Stove time 120min.Steel billet is rolled into wire rod through fast mill, enters 920 DEG C of final rolling temperature, 870 DEG C of coiling temperature.Wire rod enters
Steyr not cooling line, regulation air-cooled line stay-warm case opens quantity and blower fan aperture cooling velocity is 3.5 DEG C/s.Wire rod is annealed
Furnace annealing, 885 DEG C of holding temperature, soaking time 4.2 hours, 35 DEG C/h of cooling velocity, air cooling of being come out of the stove after being cooled to 600 DEG C.
The wire rod of the present embodiment gained Φ 10mm specifications, oxygen content 0.0016wt%, nitrogen content 0.0098wt%, hydrogen content
0.00008wt%；Surface quality is good, 9 grades of grain size, annealing material hardness HB235, field trash B 0.5, D 1.0, D 0.5e；Line
Material low power, center porosity 1.5, General Loosen 1.5, pattern segregation 0.5；Wire rod lumber recovery 98.3%, qualification rate 100%.
Embodiment 6：The production method of this gas valve steel 42Cr9Si2 wire rods uses following concrete technologies.
Alloying ferrosilicon is toasted before dephosphorization of molten iron, is toasted 145 minutes at 200 DEG C.The 58 tons of AOD smeltings of ladle molten steel amount
The whole Argon of refining, 8.2 minutes recovery times.Deslagging, thickness of slag layer 46mm are first carried out to ladle before entering refining furnace；LF stoves with addition of
100kg lime, 200kg bauxite slag making；After dipping in slag deoxidation operation is carried out with addition of 30kg calcium carbide and 4kg aluminum shots；Process slag compared with
It is dilute, it is follow-up to adjust basicity, final basicity 3.3 with addition of lime altogether.Continuous casting uses weak cold technique crystallizer, 1500~1600L/ of water
Min, Argon amount 5NL/h.
Steel billet is heated in heating furnace, 830 DEG C of preheating section temperature, 1125 DEG C of heating-up temperature, 1130 DEG C of soaking temperature,
Stove time 140min.Steel billet is rolled into wire rod through fast mill, enters 950 DEG C of final rolling temperature, 880 DEG C of coiling temperature.Wire rod enters
Steyr not cooling line, regulation air-cooled line stay-warm case opens quantity and blower fan aperture cooling velocity is 4.0 DEG C/s.Wire rod is annealed
Furnace annealing, 880 DEG C of holding temperature, soaking time 3.5 hours, 25 DEG C/h of cooling velocity, air cooling of being come out of the stove after being cooled to 600 DEG C.
The wire rod of the present embodiment gained Φ 11mm specifications, oxygen content 0.0011wt%, nitrogen content 0.0100wt%, hydrogen content
0.00006wt%；Surface quality is good, 9 grades of grain size, annealing material hardness HB230, field trash A 0.5, D 1.0, D 0.5e；Line
Material low power, center porosity 1.0, General Loosen 0.5, pattern segregation 0.5；Wire rod lumber recovery 98.2%, qualification rate 100%.
Claims (7)
1. a kind of production method of gas valve steel 42Cr9Si2 wire rods, it is characterised in that：It include alloying ferrosilicon pretreatment,
AOD furnace smelting, the refining of LF stoves, continuous casting, rolling and annealing operation；Alloying ferrosilicon pretreatment process：Alloying ferrosilicon is entered
Row baking；The AOD furnace smelting procedure：Whole Argon, the recovery time is more than 8 minutes.
2. the production method of gas valve steel 42Cr9Si2 wire rods according to claim 1, it is characterised in that：The baking
Temperature >=200 DEG C, time >=120 minute.
3. the production method of gas valve steel 42Cr9Si2 wire rods according to claim 1, it is characterised in that the LF stoves essence
Refining operation：Molten steel enters LF stokeholds carries out deslagging, it is ensured that thickness of slag layer≤50mm；Bauxite is added to make high alkalinity using lime during slag making
Slag, basicity of slag >=3.0.
4. the production method of gas valve steel 42Cr9Si2 wire rods according to claim 1, it is characterised in that the rolling work
Sequence：1130 DEG C~1140 DEG C of soaking zone temperature；Enter 900~950 DEG C of final rolling temperature, 860~900 DEG C of laying temperature.
5. the production method of gas valve steel 42Cr9Si2 wire rods according to claim 4, it is characterised in that：The rolling work
In sequence, steel billet preheating temperature≤850 DEG C, 1120~1150 DEG C of bringing-up section temperature.
6. the production method of gas valve steel 42Cr9Si2 wire rods according to claim 4, it is characterised in that：The rolling work
In sequence, time inside furnace is 120~180min.
7. the production method of the gas valve steel 42Cr9Si2 wire rods according to claim 1-6 any one, its feature exists
In the annealing operation：880 DEG C ± 5 DEG C of holding temperature, soaking time 4 ± 0.5 hours；It is 25 that cooling velocity is controlled after insulation
DEG C~35 DEG C/h.
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| CN108220750A (en) * | 2018-01-15 | 2018-06-29 | 江苏申源特钢有限公司 | A kind of production method of the bright as silver bars of high carbon martensite Valve Steel 85Cr18Mo2V |
| CN108380835A (en) * | 2018-04-17 | 2018-08-10 | 攀钢集团江油长城特殊钢有限公司 | The low segregation air valve steel continuous casting billet of one kind and its manufacturing method |
| CN108380835B (en) * | 2018-04-17 | 2020-03-27 | 攀钢集团江油长城特殊钢有限公司 | Low-segregation gas valve steel continuous casting billet and manufacturing method thereof |
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Application publication date: 20170531 |