CN113600618A - Method for preventing surface iron oxide from being pressed into 9Ni steel and rolling process - Google Patents
Method for preventing surface iron oxide from being pressed into 9Ni steel and rolling process Download PDFInfo
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- CN113600618A CN113600618A CN202110731844.3A CN202110731844A CN113600618A CN 113600618 A CN113600618 A CN 113600618A CN 202110731844 A CN202110731844 A CN 202110731844A CN 113600618 A CN113600618 A CN 113600618A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 115
- 239000010959 steel Substances 0.000 title claims abstract description 115
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 53
- 238000005096 rolling process Methods 0.000 title claims abstract description 49
- 238000010438 heat treatment Methods 0.000 claims abstract description 70
- 238000010079 rubber tapping Methods 0.000 claims abstract description 46
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000010422 painting Methods 0.000 claims abstract description 16
- 229910052742 iron Inorganic materials 0.000 claims abstract description 12
- 238000004381 surface treatment Methods 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims description 30
- 239000011248 coating agent Substances 0.000 claims description 11
- 238000000576 coating method Methods 0.000 claims description 11
- 230000003064 anti-oxidating effect Effects 0.000 claims description 10
- 239000000498 cooling water Substances 0.000 claims description 9
- 238000005507 spraying Methods 0.000 claims description 9
- 239000000446 fuel Substances 0.000 claims description 8
- 238000005098 hot rolling Methods 0.000 claims description 8
- 238000007781 pre-processing Methods 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 6
- 238000005496 tempering Methods 0.000 claims description 6
- 230000001186 cumulative effect Effects 0.000 claims description 5
- 241000316887 Saissetia oleae Species 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 22
- 238000004519 manufacturing process Methods 0.000 abstract description 15
- 239000007921 spray Substances 0.000 description 9
- 238000012797 qualification Methods 0.000 description 5
- 239000000443 aerosol Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003949 liquefied natural gas Substances 0.000 description 2
- 238000002203 pretreatment Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000003860 storage Methods 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
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
-
- 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
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
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- Mechanical Engineering (AREA)
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Abstract
The invention discloses a method for preventing surface iron oxide from being pressed into 9Ni steel and a rolling process, and belongs to the technical field of steel production. The method for preventing the surface of the 9Ni steel from being oxidized by the iron comprises the following steps: s10, performing surface treatment, namely performing grinding treatment on the surface of the 9Ni steel plate blank; s11, painting, namely painting the surface of the 9Ni steel plate blank; s12, heating, namely heating the 9Ni steel plate blank in a heating furnace at 1180-1200 ℃ for 200-220 min; and S13, tapping and descaling, wherein after tapping from the heating furnace, the steel enters a descaling box within 2-4S for descaling. According to the method for preventing the pressing-in of the iron oxide on the surface of the 9Ni steel, disclosed by the invention, the process before the 9Ni steel plate blank enters the descaling box is improved, so that the generation rate of the primary iron oxide on the surface of the 9Ni steel plate blank is reduced on one hand, the generated primary iron oxide is easier to remove on the other hand, and after the descaling box descales, the primary iron oxide on the surface of the plate blank is extremely small, the pressing-in of the iron oxide in the subsequent rolling process is effectively avoided, and the production yield of the 9Ni steel is improved.
Description
Technical Field
The invention belongs to the technical field of steel production, and particularly relates to a method for preventing surface iron oxide from being pressed into 9Ni steel and a rolling process.
Background
The 9Ni steel is W (Ni) =9% medium alloy steel developed in 1944, is low-carbon quenched and tempered steel, has good toughness and high strength at extremely low temperature, has the lowest usable temperature of-196 ℃, is mainly used for manufacturing large Liquefied Natural Gas (LNG) storage tanks and transport ships, is the material with the best toughness used in deep cooling environments, and has great production difficulty.
In the production process of the 9Ni steel plate, the fact that iron oxide is pressed into the lower surface of almost every plate is found, the iron oxide is analyzed to be primary iron oxide, the primary iron oxide pressing is a main reason for low qualification rate of the 9Ni steel, the 9Ni steel is used as a high-technical-requirement steel grade, only 2 limited steel mills can produce the 9Ni steel at present, and according to statistics, the qualification rate is only about 50%, therefore, the technology capable of reducing or preventing the iron oxide pressing into the surface of the 9Ni steel is provided, and the method has great effects on improving the qualification rate and reducing the cost in the production process of the 9Ni steel plate.
Through retrieval, the Chinese patent publication number: CN 109719146A; the publication date is as follows: 5 months and 7 days in 2019; the method is characterized in that in a medium plate production line, an aerosol spray device is arranged between a heating furnace and a descaling box, an odd-number pass aerosol spray device is arranged between the descaling box and a descaling water beam at an odd-number pass rolling inlet of a rolling mill, the position close to the descaling water beam at the odd-number pass rolling inlet is provided with the odd-number pass aerosol spray device, an even-number pass aerosol spray device is arranged in front of the descaling water beam at an even-number pass rolling inlet of the rolling mill, and the descaling process adopts the following process parameters: (1) heating the descaling box section by a heating furnace, wherein the heating temperature is 1100-1350 ℃, and the heating time is 120-300 min; (2) an inlet section of the rolling mill with odd number of passes has the inlet temperature of 950-1250 ℃; (3) and (3) at the inlet section of the rolling mill with even number of passes, wherein the inlet surface temperature is 800-1150 ℃. The method of the application improves the descaling efficiency of the hot rolling production process and reduces the residue of scale after descaling, but the method of the application increases the process steps of the descaling stage, on one hand, the corresponding production equipment needs to be adjusted with larger adaptability, the early cost is improved, on the other hand, the process of the rolling process becomes complicated, and the production efficiency is reduced.
Disclosure of Invention
In order to solve at least one of the above technical problems, according to an aspect of the present invention, there is provided a method for preventing surface iron oxide from being pressed into 9Ni steel, comprising the steps of:
s10, performing surface treatment, namely performing grinding treatment on the surface of the 9Ni steel plate blank;
s11, painting, namely painting the surface of the 9Ni steel plate blank;
s12, heating, namely heating the 9Ni steel plate blank in a heating furnace at 1180-1200 ℃ for 200-220 min;
and S13, tapping and descaling, wherein after tapping from the heating furnace, the steel enters a descaling box within 2-4S for descaling.
According to the method for preventing the surface of the 9Ni steel from being pressed into the iron oxide, optionally, in step S10, the 9Ni steel plate blank is ground until the surface of the 9Ni steel plate blank has no air bubbles, no cracks and no black iron scale.
According to the method for preventing the surface of the 9Ni steel from being oxidized by the iron, provided by the embodiment of the invention, optionally, in step S11, the surface of the 9Ni steel slab is sprayed with the anti-oxidation coating.
According to the method for preventing the surface of the 9Ni steel from being oxidized by the iron, optionally, in the step S12, the air-fuel ratio of the heating furnace is 5.0-6.0.
According to the method for pressing the 9Ni steel surface iron oxide into the steel plate, optionally, in step S13, the speed of a steel tapping roller way is 2.0-2.5 m/S during steel tapping, and cooling water spraying is stopped at the steel tapping roller way during steel tapping.
According to another aspect of the invention, a 9Ni steel rolling process is provided, which comprises the following steps:
s1, preprocessing, namely implementing the method for preventing the surface of the 9Ni steel from being pressed into the iron oxide layer in the embodiment of the invention;
s2, hot rolling, wherein two-stage rolling control is adopted;
s3, cooling, and cooling to 200-300 ℃ in a cooling bed after rolling;
s4, straightening a 9Ni steel plate blank at the temperature of 200-300 ℃;
and S5, carrying out heat treatment, tempering the plate blank, and then air-cooling to room temperature.
According to the 9Ni steel rolling process provided by the embodiment of the invention, optionally, in the step S2, the first-stage rolling temperature is 1000-1100 ℃, the second-stage rolling temperature is 800-820 ℃, and the cumulative reduction rate is more than or equal to 70%.
According to the method for preventing the pressing-in of the iron oxide on the surface of the 9Ni steel, the process before the 9Ni steel plate blank enters the descaling box is improved, so that the generation rate of the primary iron oxide on the surface of the 9Ni steel plate blank is reduced on one hand, the generated primary iron oxide is easier to remove on the other hand, and after the descaling box descales, the primary iron oxide on the surface of the plate blank is extremely small, the pressing-in of the iron oxide in the subsequent rolling process is effectively avoided, and the production yield of the 9Ni steel is improved;
the 9Ni steel rolling process disclosed by the invention has the advantages that the content of primary iron oxide on the surface of the plate blank is greatly reduced through pre-treatment, the condition that the iron oxide is pressed into the surface of the plate blank cannot occur in the hot rolling process, the risk of surface defects of the plate blank is further reduced by matching with the subsequent temperature straightening process, and the final finished product percent of pass is more than 90%.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below, and it is apparent that the drawings in the following description only relate to some embodiments of the present invention and are not limiting on the present invention.
FIG. 1 shows a flow chart of the method for preventing the surface of 9Ni steel from being pressed into iron oxide;
fig. 2 shows a flow chart of the 9Ni steel rolling process of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments.
Example 1
The method for preventing the surface of the 9Ni steel from being oxidized by the iron oxide comprises the following steps:
s10, performing surface treatment, namely performing grinding treatment on the surface of the 9Ni steel plate blank until the surface of the 9Ni steel plate blank has no bubbles, no cracks and no black iron scale, so that the surface of the plate blank presents metallic luster, and the subsequent coating of an anti-oxidation coating is facilitated;
s11, painting, namely painting the surface of a 9Ni steel plate blank, and spraying an anti-oxidation coating on the surface of the 9Ni steel plate blank, wherein the anti-oxidation coating is a mature technology in the prior art and has high temperature resistance, and can effectively prevent the production of iron oxide scales after being coated on the surface of the plate blank;
s12, heating, namely heating the 9Ni steel plate blank in a heating furnace at 1180-1200 ℃ for 200-220 min, wherein the air-fuel ratio of the heating furnace is 5.0-6.0, the 9Ni steel plate blank is assembled with steel before heating, which is beneficial to a driver, and the air-fuel ratio is controlled to be 5.0-6.0 during heating, so that the adhesion of subsequently generated iron oxide can be reduced, and the generated iron oxide can be removed;
s13, descaling during tapping from the heating furnace, wherein the speed of a tapping roller way is 2.0-2.5 m/S, cooling water spraying is stopped at the tapping roller way during tapping, and the steel plate blank enters a descaling box for descaling within 2-4S after tapping, so that the speed of the tapping roller way is increased, the steel plate blank can enter the descaling box after being discharged from the furnace, the temperature drop of the steel plate blank is reduced, and the production amount of iron oxide scales in the process is reduced; because the slab quality is great, the anti oxidation coating of the slab lower surface with the contact of tapping roll table is damaged by the pressure easily and is come off, consequently, the slab lower surface produces the iron scale more easily, there is the shower head to roll table spray cooling below the tapping roll table usually, but cooling water accelerates the temperature drop under the slab, can cause the uneven temperature of slab lower surface, make the iron oxide adhesion increase, can increase follow-up descaling box descaling the degree of difficulty, consequently, this embodiment is when tapping, tapping roll table department stops cooling water and sprays, can effectively reduce lower surface iron scale production volume and reduce and get rid of the degree of difficulty.
By the method, the surface temperature drop of the plate blank after tapping is effectively reduced, the surface temperature uniformity of the plate blank is improved, iron oxide measures which are beneficial to descaling and removing are formed, and the effect of removing phosphorus from the iron oxide in the descaling box under high pressure is enhanced, so that the condition that the iron oxide is pressed in the subsequent rolling process is improved, the surface quality of 9Ni steel is improved, and the product percent of pass is improved.
Example 2
The 9Ni steel rolling process of the embodiment comprises the following steps:
s1, preprocessing
S10, performing surface treatment, namely performing grinding treatment on the surface of the 9Ni steel plate blank until the surface of the 9Ni steel plate blank has no bubbles, no cracks and no black iron scale;
s11, painting, namely painting the surface of the 9Ni steel plate blank, and spraying an anti-oxidation coating on the surface of the 9Ni steel plate blank;
s12, heating, namely heating the 9Ni steel plate blank in a heating furnace at 1180-1200 ℃, for 200-220 min, wherein the air-fuel ratio of the heating furnace is 5.0-6.0;
s13, descaling during tapping, wherein the speed of a tapping roller way is 2.0-2.5 m/S during tapping from the heating furnace, cooling water spraying is stopped at the tapping roller way during tapping, and the steel enters a descaling box for descaling within 2-4S after tapping;
s2, hot rolling, wherein two-stage controlled rolling is adopted, wherein the rolling temperature of one stage is 1000-1100 ℃, the rolling temperature of the second stage is 800-820 ℃, and the cumulative reduction rate is more than or equal to 70%;
s3, cooling, and cooling to 200-300 ℃ in a cooling bed after rolling;
s4, straightening by temperature straightening, namely straightening a 9Ni steel plate blank at the temperature of 200-300 ℃, wherein the conventional straightening process is thermal straightening, namely straightening at the temperature of about 1000 ℃, in the process of the embodiment, the probability of surface defects is increased if the plate blank subjected to pre-treatment is subjected to thermal straightening, so that the qualification rate of a final finished product is influenced, and the risk of surface defects of the plate blank can be effectively reduced by adopting the temperature straightening process;
and S5, performing heat treatment, namely tempering the plate blank and then air-cooling to room temperature, wherein the heat treatment process of the embodiment is a conventional heat treatment process, namely heating the plate blank to 600 ℃, preserving heat for 60min and then air-cooling to room temperature.
Through the process of the embodiment, the qualification rate of the final finished product is over 90 percent.
Example 3
The 9Ni steel rolling process of the embodiment comprises the following steps:
s1, preprocessing
S10, performing surface treatment, namely performing grinding treatment on the surface of the 9Ni steel plate blank until the surface of the 9Ni steel plate blank has no bubbles, no cracks and no black iron scale;
s11, painting, namely painting the surface of the 9Ni steel plate blank, and spraying an anti-oxidation coating on the surface of the 9Ni steel plate blank;
s12, heating, namely heating the 9Ni steel plate blank in a heating furnace, wherein the heating temperature is 1180 ℃, the heating time is 200min, and the air-fuel ratio of the heating furnace is 5.0;
s13, descaling during tapping from the heating furnace, wherein the speed of a tapping roller way is 2.0m/S, the cooling water spray is stopped at the tapping roller way during tapping, and the steel enters a descaling box for descaling within 3S after tapping;
s2, hot rolling, wherein two-stage controlled rolling is adopted, wherein the rolling temperature in one stage is 1000 ℃, the rolling temperature in the second stage is 800 ℃, and the accumulated reduction rate is more than or equal to 70%;
s3, cooling, and cooling to 200 ℃ on a cooling bed after rolling;
s4, straightening the 9Ni steel plate blank at the temperature of 200 ℃ by temperature straightening;
and S5, performing heat treatment, namely tempering the plate blank and then air-cooling to room temperature, wherein the heat treatment process of the embodiment is a conventional heat treatment process, namely heating the plate blank to 600 ℃, preserving heat for 60min and then air-cooling to room temperature.
The 9Ni steel product produced by the process of the embodiment is inspected to have a yield of 92%.
Example 4
The 9Ni steel rolling process of the embodiment comprises the following steps:
s1, preprocessing
S10, performing surface treatment, namely performing grinding treatment on the surface of the 9Ni steel plate blank until the surface of the 9Ni steel plate blank has no bubbles, no cracks and no black iron scale;
s11, painting, namely painting the surface of the 9Ni steel plate blank, and spraying an anti-oxidation coating on the surface of the 9Ni steel plate blank;
s12, heating, namely heating the 9Ni steel plate blank in a heating furnace, wherein the heating temperature is 1200 ℃, the heating time is 220min, and the air-fuel ratio of the heating furnace is 6.0;
s13, descaling during tapping from the heating furnace, wherein the speed of a tapping roller way is 2.5m/S, the cooling water spray is stopped at the tapping roller way during tapping, and the steel enters a descaling box for descaling within 2S after tapping;
s2, hot rolling, wherein two-stage controlled rolling is adopted, wherein the rolling temperature in one stage is 1100 ℃, the rolling temperature in the second stage is 820 ℃, and the cumulative reduction rate is more than or equal to 70%;
s3, cooling, and cooling to 300 ℃ in a cooling bed after rolling;
s4, straightening the 9Ni steel plate blank at the temperature of 300 ℃;
and S5, performing heat treatment, namely tempering the plate blank and then air-cooling to room temperature, wherein the heat treatment process of the embodiment is a conventional heat treatment process, namely heating the plate blank to 600 ℃, preserving heat for 60min and then air-cooling to room temperature.
The 9Ni steel product produced by the process of the embodiment is inspected to have a percent of pass of 95%.
Example 5
The 9Ni steel rolling process of the embodiment comprises the following steps:
s1, preprocessing
S10, performing surface treatment, namely performing grinding treatment on the surface of the 9Ni steel plate blank until the surface of the 9Ni steel plate blank has no bubbles, no cracks and no black iron scale;
s11, painting, namely painting the surface of the 9Ni steel plate blank, and spraying an anti-oxidation coating on the surface of the 9Ni steel plate blank;
s12, heating, namely heating the 9Ni steel plate blank in a heating furnace, wherein the heating temperature is 1190 ℃, the heating time is 210min, and the air-fuel ratio of the heating furnace is 5.5;
s13, descaling during tapping from the heating furnace, wherein the speed of a tapping roller way is 2.0m/S, the cooling water spray is stopped at the tapping roller way during tapping, and the steel enters a descaling box for descaling within 4S after tapping;
s2, hot rolling, wherein two-stage controlled rolling is adopted, wherein the rolling temperature in the first stage is 1050 ℃, the rolling temperature in the second stage is 810 ℃, and the cumulative reduction rate is more than or equal to 70%;
s3, cooling, and cooling to 250 ℃ on a cooling bed after rolling;
s4, straightening the 9Ni steel plate blank at the temperature of 250 ℃;
and S5, performing heat treatment, namely tempering the plate blank and then air-cooling to room temperature, wherein the heat treatment process of the embodiment is a conventional heat treatment process, namely heating the plate blank to 600 ℃, preserving heat for 60min and then air-cooling to room temperature.
The 9Ni steel product produced by the process of the embodiment is inspected to have a yield of 93%.
The examples described herein are merely illustrative of the preferred embodiments of the present invention and do not limit the spirit and scope of the present invention, and various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the design concept of the present invention shall fall within the protection scope of the present invention.
Claims (7)
1. The method for preventing the surface of 9Ni steel from being oxidized by iron is characterized by comprising the following steps of:
s10, performing surface treatment, namely performing grinding treatment on the surface of the 9Ni steel plate blank;
s11, painting, namely painting the surface of the 9Ni steel plate blank;
s12, heating, namely heating the 9Ni steel plate blank in a heating furnace at 1180-1200 ℃ for 200-220 min;
and S13, tapping and descaling, wherein after tapping from the heating furnace, the steel enters a descaling box within 2-4S for descaling.
2. The method for preventing the surface iron oxide of the 9Ni steel from being pressed in according to claim 1, wherein the method comprises the following steps: in step S10, the 9Ni steel slab is ground until the surface has no bubbles, no cracks, and no black scale.
3. The method for preventing the surface iron oxide of the 9Ni steel from being pressed in according to claim 1, wherein the method comprises the following steps: in step S11, an anti-oxidation coating is sprayed on the surface of the 9Ni steel slab.
4. The method for preventing the surface iron oxide of the 9Ni steel from being pressed in according to claim 1, wherein the method comprises the following steps: in step S12, the air-fuel ratio of the heating furnace is 5.0 to 6.0.
5. The method for preventing the surface iron oxide of the 9Ni steel from being pressed in according to claim 1, wherein the method comprises the following steps: and step S13, during tapping, the speed of the tapping roller way is 2.0-2.5 m/S, and during tapping, the cooling water spraying is stopped at the tapping roller way.
6. The 9Ni steel rolling process is characterized by comprising the following steps:
s1, pre-processing, and implementing the method for preventing the surface of the 9Ni steel from being pressed into the iron oxide layer according to any one of claims 1 to 5;
s2, hot rolling, wherein two-stage rolling control is adopted;
s3, cooling, and cooling to 200-300 ℃ in a cooling bed after rolling;
s4, straightening a 9Ni steel plate blank at the temperature of 200-300 ℃;
and S5, carrying out heat treatment, tempering the plate blank, and then air-cooling to room temperature.
7. The rolling process of 9Ni steel according to claim 6, wherein in step S2, the first-stage rolling temperature is 1000-1100 ℃, the second-stage rolling temperature is 800-820 ℃, and the cumulative reduction rate is not less than 70%.
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