CN110408834B - Method for improving flaw detection qualification rate of steel ingot low-Si hydro Cr-Mo steel - Google Patents
Method for improving flaw detection qualification rate of steel ingot low-Si hydro Cr-Mo steel Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 224
- 239000010959 steel Substances 0.000 title claims abstract description 224
- 238000001514 detection method Methods 0.000 title claims abstract description 46
- 238000012797 qualification Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 38
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 238000005266 casting Methods 0.000 claims abstract description 35
- 238000005096 rolling process Methods 0.000 claims abstract description 30
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000007670 refining Methods 0.000 claims abstract description 24
- 238000009628 steelmaking Methods 0.000 claims abstract description 22
- 238000010438 heat treatment Methods 0.000 claims abstract description 19
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 17
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 17
- 239000004571 lime Substances 0.000 claims abstract description 17
- 238000003723 Smelting Methods 0.000 claims abstract description 14
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 11
- 239000000956 alloy Substances 0.000 claims abstract description 6
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 6
- 230000001914 calming effect Effects 0.000 claims abstract description 4
- 238000005984 hydrogenation reaction Methods 0.000 claims description 13
- 238000010079 rubber tapping Methods 0.000 claims description 11
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 8
- 206010039897 Sedation Diseases 0.000 claims description 8
- 229910052739 hydrogen Inorganic materials 0.000 claims description 8
- 239000001257 hydrogen Substances 0.000 claims description 8
- 230000036280 sedation Effects 0.000 claims description 8
- 238000005086 pumping Methods 0.000 abstract description 10
- 238000006722 reduction reaction Methods 0.000 description 10
- 229910052710 silicon Inorganic materials 0.000 description 9
- 230000007547 defect Effects 0.000 description 6
- 238000005275 alloying Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000004321 preservation Methods 0.000 description 4
- 239000002893 slag Substances 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- -1 and P: 0.005% Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/02—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/58—Roll-force control; Roll-gap control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
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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
- C21C7/06—Deoxidising, e.g. killing
-
- 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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- 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)
- Mechanical Engineering (AREA)
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
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Abstract
The invention discloses a method for improving the flaw detection qualification rate of steel ingot low-Si hydro Cr-Mo steel, which comprises the following steps: 1) electric furnace steelmaking: adding 9-13 kg of lime per t of steel during electric furnace smelting; 2) steel making in a refining furnace: during refining, carbon powder is added until the carbon content of the molten steel is 0.07-0.10%, 1.51-1.68 kg of Al wires are fed per ton of steel before alloy is added, the Al content in the molten steel is 0.02-0.04% after vacuum pumping, and the molten steel is subjected to calming treatment after vacuum pumping; 3) casting: the casting temperature is 1563-; 4) heating and rolling a steel ingot: the heating temperature of the steel ingot is 1250-. The invention controls the smelting process, the casting process and the rolling process scientifically and reasonably to ensure that the flaw detection qualification rate of the steel ingot low-Si hydro Cr-Mo steel plate is more than or equal to 95 percent.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a method for improving the flaw detection qualification rate of steel ingot low-Si hydro Cr-Mo steel.
Background
For the low-Si hydro-Cr-Mo steel with larger specification and single weight, the continuous casting blank can not meet the production requirement, steel ingot forming is generally adopted, the low-Si hydro-Cr-Mo steel formed by the steel ingot is easy to have flaw detection failure, the flaw detection qualification rate of the current low-Si hydro-Cr-Mo steel is 80-85%, and the qualification rate is lower. The main reason for the flaw detection failure of the steel plate is the occurrence of layering defects or point density defects in the steel plate.
In the production process of the low-Si hydro Cr-Mo steel, the requirement of low-Si components is required to be ensured, and impurities and protective slag involved in molten steel are ensured to float sufficiently during smelting so as to ensure the purity of the molten steel, so that the technical difficulty is high and is mainly shown in the following steps: 1) the hydrogen Cr-Mo steel has strict requirements on molten steel cleanliness, needs Al deoxidation and is easy to produce a large amount of Al2O3Inclusions, and the addition of Al and SiO in the slag2Oxidation-reduction reaction occurs to cause the phenomenon of silicon increase of molten steel; 2) poor fluidity of molten steel caused by low Si content, Al produced2O3The floating of inclusions and slag involved in the molten steel is difficult. The low-Si hydrogen Cr-Mo steel is easy to have the defect of point density when molten steel is solidified due to the special components, and the technical difficulty of overcoming the defect of point density is mainly shown in the following steps: the rolling reduction of the steel ingot with larger specification and single weight is difficult to ensure, the defects are difficult to press, and the flaw detection of the steel plate is not qualified.
Because the low-Si hydrogenation Cr-Mo steel has high production cost and long production period and causes huge economic loss to enterprises if the defects are not qualified, the method for improving the flaw detection qualification rate of the steel ingot low-Si hydrogenation Cr-Mo steel is developed, and the flaw detection qualification rate is ensured to have important significance.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for improving the flaw detection qualification rate of steel ingot low-Si hydro Cr-Mo steel. The invention controls the smelting process, the casting process and the rolling process scientifically and reasonably to ensure that the flaw detection qualification rate of the steel ingot low-Si hydro Cr-Mo steel plate is more than or equal to 95 percent.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a method for improving the flaw detection qualification rate of steel ingot low-Si hydro Cr-Mo steel comprises the following steps:
(1) electric furnace steelmaking: adding 9-13 kg of lime per t of steel during electric furnace smelting, and ensuring that the Si content is low and the P content is low during electric furnace tapping;
(2) steel making in a refining furnace: during refining, carbon powder is added to ensure that the carbon content of the molten steel is 0.07-0.10 percent so as to prevent the molten steel from being over oxidized; feeding 1.51-1.68 kg of Al wires per ton of steel before adding the alloy, and ensuring that the Al content in the molten steel after vacuumizing is 0.02-0.04% so as to reduce oxide inclusions in the molten steel; after the molten steel is vacuumized, the molten steel is subjected to calming treatment to ensure that inclusions in the molten steel fully float upwards;
(3) casting: the casting temperature is 1563-;
(4) heating and rolling a steel ingot: the heating temperature of the steel ingot is 1250-.
In the step (1), P is less than or equal to 0.006 percent and Si is less than or equal to 0.01 percent during electric furnace tapping.
According to the invention, 0.5-0.8 kg of carbon powder is added in the step (2) per t of steel.
In the step (2), the molten steel is subjected to sedation treatment for 15-20min after being vacuumized.
The Si of the low-Si hydrogen Cr-Mo steel plate produced by the method is less than or equal to 0.1 percent.
The low-Si hydrogen Cr-Mo steel plate produced by the method has the thickness of 150-.
The flaw detection qualification rate of the low-Si hydrogen Cr-Mo steel plate produced by the method is more than or equal to 95 percent.
The steel ingot low-Si hydrogenation Cr-Mo steel plate standard of the invention refers to GB/T713-2014 and the flaw detection standard refers to NB/T47013.3-2015.
The design idea of the invention is as follows:
lime is added into the electric furnace to ensure the low P and low Si requirements of molten steel during the tapping of the electric furnace, and component preparation is made for refining;
during refining, C powder is added for weak deoxidation, so that Si increase can be effectively avoided, Al wire is added for strong deoxidation, and the Si increase amount can be controlled within a required range while the O content in the molten steel is ensured to meet the requirement; controlling the calming time to ensure that inclusions and the like in the molten steel fully float;
the steel passing amount is controlled in the casting process, the steel passing amount is too large and too fast to cast, the solidification speed of molten steel is too fast, the internal stress of a steel ingot is too large, the steel passing amount is too small, the superheat degree of the molten steel is insufficient in the later casting period, inclusions cannot float upwards, flaw detection cannot be achieved, and therefore a certain steel passing amount needs to be ensured, and the quality of the steel ingot is ensured;
and the heating temperature and the heat preservation time are controlled in the rolling process, so that the uniform heating of the blank is ensured, and the rolling reduction of 20-30mm is ensured under the condition of determining the rolling capacity of the rolling mill.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: 1. the invention controls the smelting process, the casting process and the rolling process scientifically and reasonably to ensure that the flaw detection qualification rate of the steel ingot low-Si hydro Cr-Mo steel plate is more than or equal to 95 percent. 2. The specification of the low-Si hydrogen Cr-Mo steel plate produced by the method is as follows: the thickness is 150-. 3. The invention does not increase the equipment investment, only innovates the process technology, and has lower production cost.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1
The method for improving the flaw detection qualification rate of the steel ingot low-Si hydro Cr-Mo steel comprises the following steps:
(1) electric furnace steelmaking: adding 13 kg of lime into the electric furnace for smelting, tapping the steel from the electric furnace, wherein the weight ratio of lime is P: 0.006%, Si: 0.01 percent;
(2) steel making in a refining furnace: during refining, 0.8 kg of carbon powder is added per t of steel to ensure that the carbon content of the molten steel is 0.10%, 1.68 kg of Al wire is fed per t of steel before alloy addition, the Al content in the molten steel is 0.04% after vacuum pumping, and the molten steel is subjected to sedation treatment for 20min after vacuum pumping;
(3) casting: the casting temperature of the steel ingot during casting is 1569 ℃, and the steel passing amount is 4.5 t/min;
(4) heating and rolling a steel ingot: the steel ingot is heated at 1280 ℃, the temperature is kept for 3 hours, and the rolling reduction is controlled at 30mm during rolling.
The method for improving the flaw detection qualification rate of the steel ingot low-Si hydrogenation Cr-Mo steel comprises the following steps: 0.10 percent; the specification of the steel plate is as follows: 200mm 1800mm 12730mm (thick wide long), single weight 36 t; the flaw detection qualification rate of the steel plate NB/T47013.3-2015I grade is 95%.
Example 2
The method for improving the flaw detection qualification rate of the steel ingot low-Si hydro Cr-Mo steel comprises the following steps:
(1) electric furnace steelmaking: adding 9 kg of lime into the electric furnace during smelting, tapping the steel from the electric furnace, wherein the weight ratio of lime is P: 0.005%, Si: 0.008 percent;
(2) steel making in a refining furnace: during refining, 0.5 kg of carbon powder is added per t of steel to ensure that the carbon content of the molten steel is 0.07 percent, 1.51 kg of Al wire is fed per t of steel before alloying is added, the Al content in the molten steel is 0.02 percent after vacuumizing, and the molten steel is subjected to sedation treatment for 15min after vacuumizing;
(3) casting: the casting temperature of the steel ingot during casting is 1563 ℃, and the steel passing amount is 3.5 t/min;
(4) heating and rolling a steel ingot: the steel ingot is heated at 1250 ℃, the temperature is kept for 4h, and the rolling reduction is controlled at 20mm during rolling.
The method for improving the flaw detection qualification rate of the steel ingot low-Si hydrogenation Cr-Mo steel comprises the following steps: 0.08 percent; the specification of the steel plate is as follows: 150mm 3500mm 9000mm (thickness, width, length), single weight 33 t; the flaw detection qualification rate of the steel plate NB/T47013.3-2015I grade is 97%.
Example 3
The method for improving the flaw detection qualification rate of the steel ingot low-Si hydro Cr-Mo steel comprises the following steps:
(1) electric furnace steelmaking: adding 10 kg of lime into the electric furnace during smelting, tapping the steel from the electric furnace, wherein the weight ratio of lime is P: 0.005%, Si: 0.008 percent;
(2) steel making in a refining furnace: during refining, 0.6 kg of carbon powder is added per t of steel to ensure that the carbon content of the molten steel is 0.09%, 1.57 kg of Al wire is fed per t of steel before alloying is added, the Al content in the molten steel is 0.034% after vacuumizing, and the molten steel is killed for 17min after vacuumizing;
(3) casting: the casting temperature of the steel ingot during casting is 1565 ℃, and the steel passing amount is 3.6 t/min;
(4) heating and rolling a steel ingot: the heating temperature of the steel ingot is 1267 ℃, the heat preservation is carried out for 3.2h, and the rolling reduction is controlled at 23 mm.
The method for improving the flaw detection qualification rate of the steel ingot low-Si hydrogenation Cr-Mo steel comprises the following steps: 0.05 percent; the specification of the steel plate is as follows: 153mm 2740mm 9120mm (thickness, width, length), 30t in single weight; the flaw detection qualification rate of the steel plate NB/T47013.3-2015I grade is 96.8%.
Example 4
The method for improving the flaw detection qualification rate of the steel ingot low-Si hydro Cr-Mo steel comprises the following steps:
(1) electric furnace steelmaking: adding 11 kg of lime into the electric furnace during smelting, tapping the steel from the electric furnace, wherein the weight ratio of lime is P: 0.004%, Si: 0.006%;
(2) steel making in a refining furnace: during refining, 0.7 kg of carbon powder is added per t of steel to ensure that the carbon content of the molten steel is 0.075%, 1.64 kg of Al wire is added per t of steel before alloying is added, the Al content in the molten steel is 0.031% after vacuum pumping, and the molten steel is subjected to sedation treatment for 18min after vacuum pumping;
(3) casting: the casting temperature of the steel ingot during casting is 1568 ℃, and the steel passing amount is 4.1 t/min;
(4) heating and rolling a steel ingot: the steel ingot is heated at 1271 ℃, the temperature is kept for 3.6 hours, and the rolling reduction is controlled at 29 mm.
The method for improving the flaw detection qualification rate of the steel ingot low-Si hydrogenation Cr-Mo steel comprises the following steps: 0.07 percent; the specification of the steel plate is as follows: 162mm 2110mm 13000mm (thickness, width, length), single weight 35 t; the NB/T47013.3-2015I-level flaw detection qualification rate of the steel plate is 97.8 percent.
Example 5
The method for improving the flaw detection qualification rate of the steel ingot low-Si hydro Cr-Mo steel comprises the following steps:
(1) electric furnace steelmaking: when smelting in an electric furnace, adding 12 kg of lime per t of steel, and when tapping from the electric furnace, adding P: 0.006%, Si: 0.007%;
(2) steel making in a refining furnace: during refining, 0.55 kg of carbon powder is added per t of steel to ensure that the carbon content of the molten steel is 0.081 percent, 1.61 kg of Al wire is fed per t of steel before alloy addition, the Al content in the molten steel is 0.029 percent after vacuum pumping, and the molten steel is subjected to sedation treatment for 19min after vacuum pumping;
(3) casting: the casting temperature of the steel ingot during casting is 1564 ℃, and the steel passing amount is 4.3 t/min;
(4) heating and rolling a steel ingot: the heating temperature of the steel ingot is 1263 ℃, the heat preservation is carried out for 3.5h, and the rolling reduction is controlled at 26 mm.
The method for improving the flaw detection qualification rate of the steel ingot low-Si hydrogenation Cr-Mo steel comprises the following steps: 0.09%; the specification of the steel plate is as follows: 171mm 2082mm 11450mm (thickness, width, length), single weight 32 t; the flaw detection qualification rate of the steel plate NB/T47013.3-2015I grade is 97.1%.
Example 6
The method for improving the flaw detection qualification rate of the steel ingot low-Si hydro Cr-Mo steel comprises the following steps:
(1) electric furnace steelmaking: when the electric furnace is smelted, 12.5 kg of lime is added per t of steel, and when the electric furnace taps, P: 0.005%, Si: 0.008 percent;
(2) steel making in a refining furnace: during refining, 0.62 kg of carbon powder is added per ton of steel to ensure that the carbon content of the molten steel is 0.091%, 1.54 kg of Al wire is fed per ton of steel before alloying is added, the Al content in the molten steel is 0.021% after vacuumizing, and the molten steel is subjected to sedation treatment for 17min after vacuumizing;
(3) casting: the casting temperature of the steel ingot during casting is 1567 ℃, and the steel passing amount is 4.1 t/min;
(4) heating and rolling a steel ingot: the steel ingot is heated at 1278 ℃, the temperature is kept for 3.7 hours, and the rolling reduction is controlled at 23 mm.
The method for improving the flaw detection qualification rate of the steel ingot low-Si hydrogenation Cr-Mo steel comprises the following steps: 0.10 percent; the specification of the steel plate is as follows: 198mm 2312mm 9460mm (thick, wide, long), single weight 34 t; the NB/T47013.3-2015I-level flaw detection qualification rate of the steel plate is 95.8 percent.
Example 7
The method for improving the flaw detection qualification rate of the steel ingot low-Si hydro Cr-Mo steel comprises the following steps:
(1) electric furnace steelmaking: adding 11 kg of lime into the electric furnace during smelting, tapping the steel from the electric furnace, wherein the weight ratio of lime is P: 0.006%, Si: 0.006%;
(2) steel making in a refining furnace: during refining, 0.7 kg of carbon powder is added per t of steel to ensure that the carbon content of the molten steel is 0.085%, 1.58 kg of Al wire is fed per t of steel before alloying is added, the Al content in the molten steel is 0.027% after vacuumizing, and the molten steel is killed for 16min after vacuumizing;
(3) casting: the casting temperature of the steel ingot during casting is 1564 ℃, and the steel passing amount is 3.9 t/min;
(4) heating and rolling a steel ingot: the heating temperature of the steel ingot is 1268 ℃, the heat preservation is carried out for 3.1h, and the rolling reduction is controlled at 25 mm.
The method for improving the flaw detection qualification rate of the steel ingot low-Si hydrogenation Cr-Mo steel comprises the following steps: 0.08 percent; the specification of the steel plate is as follows: 198mm 2312mm 9460mm (thick, wide, long), single weight 34 t; the flaw detection qualification rate of the steel plate NB/T47013.3-2015I grade 98.8%.
Example 8
The method for improving the flaw detection qualification rate of the steel ingot low-Si hydro Cr-Mo steel comprises the following steps:
(1) electric furnace steelmaking: 10.6 kg of lime is added in the electric furnace smelting process per t of steel, and P: 0.005%, Si: 0.009%;
(2) steel making in a refining furnace: during refining, 0.64 kg of carbon powder is added per t of steel to ensure that the carbon content of the molten steel is 0.089%, 1.61 kg of Al wire is fed per t of steel before alloy addition, the Al content in the molten steel is 0.033% after vacuum pumping, and the molten steel is subjected to sedation treatment for 18min after vacuum pumping;
(3) casting: the casting temperature of the steel ingot during casting is 1567 ℃, and the steel passing amount is 4.4 t/min;
(4) heating and rolling a steel ingot: the steel ingot is heated at 1271 ℃, the temperature is kept for 3.7 hours, and the rolling reduction is controlled at 27mm during rolling.
The method for improving the flaw detection qualification rate of the steel ingot low-Si hydrogenation Cr-Mo steel comprises the following steps: 0.09%; the specification of the steel plate is as follows: 166mm 2132mm 12600mm (thick, wide, long), single weight 35 t; the NB/T47013.3-2015I-level flaw detection qualification rate of the steel plate is 97.4 percent.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (3)
1. The method for improving the flaw detection qualification rate of the steel ingot low-Si hydro Cr-Mo steel is characterized by comprising the following steps of:
(1) electric furnace steelmaking: adding 9-13 kg of lime per t of steel during electric furnace smelting, and ensuring that the Si content is low and the P content is low during electric furnace tapping;
(2) steel making in a refining furnace: during refining, adding carbon powder to enable the carbon content of the molten steel to be 0.07-0.10%, feeding 1.51-1.68 kg of Al wires per ton of steel before alloy addition, vacuumizing to enable the Al content in the molten steel to be 0.02-0.04%, and performing calming treatment after the molten steel is vacuumized;
(3) casting: the casting temperature is 1563-;
(4) heating and rolling a steel ingot: the heating temperature of the steel ingot is 1250-;
p is less than or equal to 0.006 percent and Si is less than or equal to 0.01 percent during electric furnace tapping in the step (1);
after the molten steel in the step (2) is vacuumized, the molten steel is subjected to sedation treatment for 15-20 min;
the low-Si hydrogen Cr-Mo steel plate produced by the method comprises the following steps: the thickness is 150-;
the flaw detection qualification rate of the low-Si hydrogen Cr-Mo steel plate produced by the method is more than or equal to 95 percent.
2. The method for improving flaw detection qualification rate of steel ingot finished low-Si hydro Cr-Mo steel according to claim 1, wherein carbon powder is added in the step (2) for 0.5 to 0.8 kg per t of steel.
3. The method for improving the flaw detection qualification rate of the steel ingot low-Si hydrogenation Cr-Mo steel according to claim 1 or 2, characterized in that the Si of the low-Si hydrogenation Cr-Mo steel plate produced by the method is less than or equal to 0.1%.
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| CN112828043B (en) * | 2020-12-24 | 2023-05-23 | 舞阳钢铁有限责任公司 | Production method of large-thickness ultra-wide low-Si alloy steel plate |
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