CN115612783A - Method for eliminating surface wave defect of nitrogen-containing high-alloy steel cold roll - Google Patents
Method for eliminating surface wave defect of nitrogen-containing high-alloy steel cold roll Download PDFInfo
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- CN115612783A CN115612783A CN202211327878.7A CN202211327878A CN115612783A CN 115612783 A CN115612783 A CN 115612783A CN 202211327878 A CN202211327878 A CN 202211327878A CN 115612783 A CN115612783 A CN 115612783A
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- 238000000034 method Methods 0.000 title claims abstract description 42
- 229910000851 Alloy steel Inorganic materials 0.000 title claims abstract description 26
- 230000007547 defect Effects 0.000 title claims abstract description 24
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 title claims abstract description 23
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 32
- 238000009849 vacuum degassing Methods 0.000 claims abstract description 27
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 16
- 238000005242 forging Methods 0.000 claims abstract description 15
- 238000003723 Smelting Methods 0.000 claims abstract description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 11
- 230000003247 decreasing effect Effects 0.000 claims abstract description 5
- 238000007670 refining Methods 0.000 claims abstract description 4
- 238000001816 cooling Methods 0.000 claims description 15
- 238000002844 melting Methods 0.000 claims description 15
- 230000008018 melting Effects 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 6
- 238000000137 annealing Methods 0.000 claims description 5
- 239000007921 spray Substances 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 4
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 239000001257 hydrogen Substances 0.000 claims description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims description 4
- 239000011733 molybdenum Substances 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 3
- 229910004261 CaF 2 Inorganic materials 0.000 claims description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 3
- 239000012300 argon atmosphere Substances 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 239000011651 chromium Substances 0.000 claims description 3
- 238000000265 homogenisation Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 239000011574 phosphorus Substances 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 229910052717 sulfur Inorganic materials 0.000 claims description 3
- 239000011593 sulfur Substances 0.000 claims description 3
- 229910052720 vanadium Inorganic materials 0.000 claims description 3
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims 1
- 230000000052 comparative effect Effects 0.000 description 12
- 238000001514 detection method Methods 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- XHCLAFWTIXFWPH-UHFFFAOYSA-N [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] XHCLAFWTIXFWPH-UHFFFAOYSA-N 0.000 description 1
- BFGKITSFLPAWGI-UHFFFAOYSA-N chromium(3+) Chemical compound [Cr+3] BFGKITSFLPAWGI-UHFFFAOYSA-N 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000007920 subcutaneous administration Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 229910001935 vanadium oxide Inorganic materials 0.000 description 1
Classifications
-
- 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
- C21C7/06—Deoxidising, e.g. killing
-
- 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
- C21C7/0006—Adding metallic additives
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/16—Remelting metals
- C22B9/18—Electroslag remelting
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- 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
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a method for eliminating the surface wave defect of a nitrogen-containing high-alloy steel cold roll, which comprises the steps of smelting an electroslag ingot blank and forging a roll blank; the electroslag ingot blank smelting comprises electric furnace smelting, external refining, vacuum degassing, electrode bar pouring and electroslag remelting; before vacuum degassing, aluminum deoxidation is carried out, the vacuum degassing is carried out under the vacuum degree of 10-30 Pa, nitrogen is added in a FeCrN form after the vacuum degassing, and electroslag remelting adopts a mode of low current, high voltage and gradually decreasing voltage. The method can eliminate the surface wave defect of the nitrogen-containing high alloy steel cold roll by carrying out aluminum deoxidation before vacuum degassing, carrying out vacuum degassing at higher vacuum degree, increasing nitrogen in a FeCrN form after the vacuum degassing and adopting a mode of low current, high voltage and gradually decreasing voltage for electroslag remelting.
Description
Technical Field
The invention belongs to the technical field of nitrogen-containing high alloy steel cold rolls, and particularly relates to a method for eliminating surface wave defects of a nitrogen-containing high alloy steel cold roll.
Background
With the rapid development of the steel industry, the quality requirements of steel plates are more and more strict, and the quality requirements of cold rolls are more and more strict accordingly. Surface wave detection is a detection means which is increasingly popular, and under the roughness of Ra1.0, domestic high-end customers require no reflection echo to operate the computer in the surface wave detection process in principle. The surface wave defects are generally characterized by local inclusions, pores, segregation, carbides and the like, and the cause is complex, and particularly, the control difficulty is higher along with the increase of the content of the alloy of the roller.
The nitrogen-containing high alloy steel cold roll is a high alloy cold roll with a good using effect at present due to the nitrogen strengthening effect, but the cold roll has high alloy content and is easy to segregate, and the nitrogen content is not easy to control, so that the material is easier to have surface wave defects, and the nitrogen-containing high alloy steel cold roll becomes a great restriction on the popularization of new materials, particularly high alloy steel materials.
Disclosure of Invention
The invention aims to solve the problems and provides a method for eliminating the surface wave defect of the nitrogen-containing high-alloy steel cold roll.
The technical scheme for realizing the purpose of the invention is as follows: a method for eliminating the surface wave defect of the nitrogen-containing high alloy steel cold roll comprises smelting an electroslag ingot blank and forging a roll blank; the electroslag ingot blank smelting comprises electric furnace smelting, external refining, vacuum degassing, electrode bar pouring and electroslag remelting; and before the vacuum degassing, aluminum deoxidation is carried out, and the residual aluminum content in the electrode blank is ensured to be 0.04-0.08%.
The nitrogen-containing high alloy steel cold roll comprises the following chemical components in percentage by weight: 0.60 to 0.80 percent of carbon, 0.70 to 0.90 percent of silicon, 0.25 to 0.65 percent of manganese, less than or equal to 0.020 percent of phosphorus, less than or equal to 0.010 percent of sulfur, 4.50 to 5.50 percent of chromium, less than or equal to 0.25 percent of nickel, 0.04 to 0.10 percent of nitrogen, 0.80 to 1.20 percent of molybdenum, 0.20 to 0.80 percent of vanadium, and the balance of iron and inevitable impurities.
The vacuum degassing is carried out under the vacuum degree of 10-30 Pa; the vacuum degassing time is 20-40 min; the vacuum degassing is required to ensure that the hydrogen content in the electrode blank is less than or equal to 1.2ppm and the oxygen content is less than or equal to 15ppm.
After the vacuum degassing, feCrN is added into the ladle and heated, and the mixture is continuously stirred for more than 20min in the argon atmosphere, so that the nitrogen content is controlled to be 400-1000 ppm.
The electroslag remelting adopts a slag system comprising the following components: 40-60 wt% of CaF 2 20 to 40wt% of Al 2 O 3 And 15 to 25 weight percent of CaO.
The electroslag remelting firstly carries out roll neck section remelting at a first melting speed, then carries out roll body section remelting at a second melting speed, and finally carries out roll neck section remelting at the other end at the first melting speed.
The first melt velocity is related to the diameter of the crystallizer; the following formula is specifically satisfied: first melting rate = 0.65-0.75D Knot The unit is kg/h.
Wherein: d Knot The values are in mm of the diameter of the mold (the same applies below).
The second melt rate is related to the diameter of the crystallizer; the following formula is specifically satisfied: second melting rate = 0.80-0.85D Knot The unit is kg/h.
The electroslag remelting adopts a mode of low current, high voltage and gradually decreasing voltage.
Wherein: the current is related to the diameter of the crystallizer; the following formula is specifically satisfied: current =20D Knot 5000, units A.
The voltage is controlled to be 80-90V by adopting a magnetic regulation transformer.
The specific method for forging the roller blank comprises the following steps: firstly, carrying out high-temperature homogenization at 1200-1230 ℃; then pre-drawing is carried out; the single-side rolling amount of the pre-drawing is 20-30 mm; then, a two-upsetting and two-drawing forging process is adopted, and an upper V-shaped anvil and a lower V-shaped anvil are adopted for drawing; and finally carrying out heat treatment after forging.
The specific method of the heat treatment after forging is as follows: cooling to 500-550 ℃ by adopting an axial spray cooling mode (to avoid forming net-shaped carbide), charging and normalizing, heating to 1000-1030 ℃ by normalizing, discharging, then carrying out spray cooling to 500-550 ℃, charging and spheroidizing annealing, cooling to 700-750 ℃ at a speed of 10-30 ℃/h after spheroidizing annealing is heated to 800-920 ℃, keeping the temperature, slowly cooling to 300-400 ℃, and carrying out rough machining after discharging to obtain the roller blank.
The invention has the following positive effects:
(1) The invention carries out aluminum deoxidation before vacuum degassing and ensures that a certain content of aluminum is remained in the electrode blank, thus playing a role of continuous deoxidation in the subsequent electroslag remelting, obviously controlling the content of inclusions and eliminating the defects of surface waves.
(2) The vacuum degassing of the present invention is performed under a high degree of vacuum (10 to 30 Pa), so that the hydrogen content in the electrode blank can be controlled to 1.2ppm or less, and the oxygen content can be controlled to 15ppm or less, thereby suppressing the generation of pores and further eliminating the surface wave defect.
(3) According to the method, nitrogen is added in a FeCrN form after vacuum degassing, so that the nitrogen content can be effectively controlled, and the influence of nitrogen on surface wave defects can be avoided.
(4) The forging method can crush the liquated carbide in the steel to the maximum extent, ensure that no large-block liquated carbide exists on the surface layer of the roller blank, simultaneously ensure that the center is compacted to the maximum extent, ensure that the low-power point segregation in the roller blank is less than or equal to 1.0 level, ensure that the high-power tissue liquation is less than or equal to 1.0 level, and generally ensure that the porosity is less than or equal to 2.0 level.
(5) The electroslag remelting of the invention adopts a mode of low current, high voltage and gradually decreasing voltage, thereby further eliminating the defect of surface waves.
Detailed Description
(example 1)
The nitrogen-containing high alloy steel cold roll of the embodiment comprises the following chemical components in percentage by weight: 0.70 percent of carbon, 0.80 percent of silicon, 0.45 percent of manganese, less than or equal to 0.020 percent of phosphorus, less than or equal to 0.010 percent of sulfur, 5.00 percent of chromium, less than or equal to 0.25 percent of nickel, 0.06 to 0.08 percent of nitrogen, 1.00 percent of molybdenum, 0.50 percent of vanadium, and the balance of iron and inevitable impurities.
The method for eliminating the surface wave defect of the nitrogen-containing high alloy steel cold roll comprises the following steps:
s1: and smelting the electroslag ingot blank.
S11: an alkaline electric furnace is adopted for electric furnace smelting, and then external refining is carried out.
S12: aluminum deoxidation is carried out before vacuum degassing, and the content of residual aluminum in the electrode blank is ensured to be 0.04-0.08%, so as to ensure that the continuous deoxidation effect is played in the subsequent electroslag remelting.
Vacuum degassing is carried out for 30min under the vacuum degree of 20Pa, so that the hydrogen content in the electrode blank is less than or equal to 1.2ppm and the oxygen content is less than or equal to 15ppm.
After vacuum degassing, feCrN is added into a ladle and heated, and the mixture is continuously stirred for more than 20min in an argon atmosphere, so that the nitrogen content is controlled to be 600-800 ppm.
S13: and (4) pouring an electrode bar.
S14: and (4) electroslag remelting.
The slag system adopted in the embodiment comprises the following components: 50wt% CaF 2 30wt% of Al 2 O 3 And 20wt% CaO.
The diameter of the crystallizer used in this example was 800mm.
In the electroslag remelting process, firstly remelting the roll neck section at the first melting speed of 560 +/-5 kg/h, then remelting the roll barrel section at the second melting speed of 660 +/-5 kg/h, and finally remelting the roll neck section at the other end at the first melting speed of 560 +/-5 kg/h.
In the electroslag remelting process, the current is stabilized at 11000A, the voltage at the remelting initial stage is 90V, and the voltage is gradually reduced to 80V before subsequent remelting and feeding.
S2: and forging the roller blank.
S21: high temperature homogenization was first performed at 1215 + -5 deg.C.
S22: then pre-drawing is carried out to eliminate the subcutaneous bubbles of the electroslag ingot, and the single-side reduction of the pre-drawing is 25mm.
S23: then, a two-heading and two-drawing forging process is adopted, and an upper V-shaped anvil and a lower V-shaped anvil are adopted for drawing.
S24: heat treatment after forging:
cooling to 525 +/-5 ℃ by adopting an axial spray cooling mode (to avoid forming network carbide), charging and normalizing, heating to 1015 +/-5 ℃ by normalizing, discharging, then cooling to 525 +/-5 ℃ by spraying, charging and spheroidizing annealing, cooling to 725 +/-5 ℃ at 20 ℃/h after the spheroidizing annealing is heated to 860 +/-5 ℃, keeping the temperature, slowly cooling to 350 +/-5 ℃, and roughly processing after discharging to obtain the roll blank.
(examples 2 to 5)
The method of each example is substantially the same as that of example 1, except for the weight percentages of the chemical components and the electroslag remelting process, which are shown in table 1.
TABLE 1
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | |
| Carbon (C) | 0.70% | 0.70% | 0.70% | 0.65% | 0.75% |
| Silicon | 0.80% | 0.80% | 0.80% | 0.75% | 0.85% |
| Manganese oxide | 0.45% | 0.45% | 0.45% | 0.35% | 0.45% |
| Chromium (III) | 5.00% | 5.00% | 5.00% | 4.80% | 5.20% |
| Molybdenum (Mo) | 1.00% | 1.00% | 1.00% | 0.90% | 1.10% |
| Vanadium oxide | 0.50% | 0.50% | 0.50% | 0.35% | 0.65% |
| Diameter of crystallizer | 800mm | 680mm | 900mm | 800mm | 800mm |
| First melting rate | 560±5kg/h | 475±5kg/h | 630±5kg/h | 560±5kg/h | 560±5kg/h |
| Second melting rate | 660±5kg/h | 560±5kg/h | 740±5kg/h | 660±5kg/h | 660±5kg/h |
| Electric current | 11000A | 8600A | 13000A | 11000A | 11000A |
Comparative example 1
The process of this comparative example differs from example 1 in that: no aluminum deoxidation was performed prior to vacuum degassing.
Comparative example 2
The process of this comparative example differs from example 1 in that: vacuum degassing was carried out under a vacuum of 100Pa for 30min.
Comparative example 3
The process of this comparative example differs from example 1 in that: the nitrogen is added in gaseous form.
Comparative example 4
The method of this comparative example differs from example 1 in that: electroslag remelting adopts high current 20000A and low voltage 60V, and both the current and the voltage are constant.
(test example)
The high alloy steel containing nitrogen roll blanks obtained in the examples and the respective proportions are manufactured into the high alloy steel containing nitrogen cold roll according to the conventional process, and surface wave detection is carried out, and the results are shown in table 2.
TABLE 2
| Surface wave defect | |
| Example 1 | Is free of |
| Example 2 | Is free of |
| Example 3 | Is free of |
| Example 4 | Is free of |
| Example 5 | Is free of |
| Comparative example 1 | Is provided with |
| Comparative example 2 | Is provided with |
| Comparative example 3 | Is provided with |
| Comparative example 4 | Is provided with |
Claims (9)
1. A method for eliminating the surface wave defect of a nitrogen-containing high-alloy steel cold roll comprises smelting an electroslag ingot blank and a forging roll blank; the electroslag ingot blank smelting comprises electric furnace smelting, external refining, vacuum degassing, electrode bar pouring and electroslag remelting; the method is characterized in that: and before the vacuum degassing, aluminum deoxidation is carried out, and the residual aluminum content in the electrode blank is ensured to be 0.04-0.08%.
2. The method for eliminating the defects of the surface wave of the nitrogen-containing high-alloy steel cold roll according to claim 1, which is characterized in that: the vacuum degassing is carried out under the vacuum degree of 10-30 Pa; the vacuum degassing time is 20-40 min; the vacuum degassing is required to ensure that the hydrogen content in the electrode blank is less than or equal to 1.2ppm and the oxygen content is less than or equal to 15ppm.
3. The method for eliminating the defects of the surface wave of the nitrogen-containing high-alloy steel cold roll according to claim 1, which is characterized in that: and after vacuum degassing, adding FeCrN into the steel ladle, heating, and continuously stirring for more than 20min in an argon atmosphere to control the nitrogen content to be 400-1000 ppm.
4. The method for eliminating surface wave defects of the nitrogen-containing high alloy steel cold roll according to any one of claims 1 to 3, wherein the method comprises the following steps: the electroslag remelting adopts a mode of low current, high voltage and gradually decreasing voltage; the voltage is controlled to be 80-90V by adopting a magnetic regulation transformer; the current =20D Knot -5000, units a; said D Knot Is a value in mm of the diameter of the crystallizer.
5. The method for eliminating defects of a cold roll surface wave of a nitrogen-containing high alloy steel according to claim 4, wherein the method comprises the following steps: the electroslag remelting firstly carries out roll neck section remelting at a first melting speed, then carries out roll body section remelting at a second melting speed, and finally carries out roll neck section remelting at the other end at the first melting speed; the first melting rate =0.65 to 0.75D Knot And the second melting rate = 0.80-0.85D Knot The unit is kg/h.
6. The method for eliminating defects of a cold roll surface wave of a nitrogen-containing high alloy steel according to claim 4, wherein the method comprises the following steps: the electroslag remelting adopts a slag system comprising the following components: 40-60 wt% of CaF 2 20 to 40wt% of Al 2 O 3 And 15 to 25 weight percent of CaO.
7. The method for eliminating surface wave defects of the nitrogen-containing high alloy steel cold roll according to any one of claims 1 to 3, wherein the method comprises the following steps: the specific method for forging the roller blank comprises the following steps: firstly, carrying out high-temperature homogenization at 1200-1230 ℃; then pre-drawing is carried out; the single-side rolling amount of the pre-drawing is 20-30 mm; then, a two-heading two-drawing forging process is adopted, and an upper V-shaped anvil and a lower V-shaped anvil are adopted for drawing; and finally carrying out heat treatment after forging.
8. The method for eliminating the defects of the surface wave of the nitrogen-containing high-alloy steel cold roll according to claim 7, which is characterized in that: the specific method of the heat treatment after forging is as follows: cooling to 500-550 ℃ by adopting an axial spray cooling mode, charging and normalizing, heating to 1000-1030 ℃ by normalizing, discharging, spray cooling to 500-550 ℃, charging and spheroidizing annealing, heating to 800-920 ℃, cooling to 700-750 ℃ at a speed of 10-30 ℃/h, preserving heat, slowly cooling to 300-400 ℃, discharging and roughly processing to obtain the roll blank.
9. The method for eliminating surface wave defects of the nitrogen-containing high alloy steel cold roll according to any one of claims 1 to 3, wherein the method comprises the following steps: the nitrogen-containing high alloy steel cold roll comprises the following chemical components in percentage by weight: 0.60 to 0.80 percent of carbon, 0.70 to 0.90 percent of silicon, 0.25 to 0.65 percent of manganese, less than or equal to 0.020 percent of phosphorus, less than or equal to 0.010 percent of sulfur, 4.50 to 5.50 percent of chromium, less than or equal to 0.25 percent of nickel, 0.04 to 0.10 percent of nitrogen, 0.80 to 1.20 percent of molybdenum, 0.20 to 0.80 percent of vanadium, and the balance of iron and inevitable impurities.
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