CN112474825A - Method for controlling surface cracks of 316LN nuclear power steel in rolling process - Google Patents
Method for controlling surface cracks of 316LN nuclear power steel in rolling process Download PDFInfo
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- CN112474825A CN112474825A CN202011124646.2A CN202011124646A CN112474825A CN 112474825 A CN112474825 A CN 112474825A CN 202011124646 A CN202011124646 A CN 202011124646A CN 112474825 A CN112474825 A CN 112474825A
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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
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
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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
- B21B37/56—Elongation control
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- 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
- B21B45/004—Heating the product
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- 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
- B21B45/02—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 lubricating, cooling, or cleaning
- B21B45/0203—Cooling
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- 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
- B21B45/08—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 hydraulically
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- 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
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- 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
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- 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
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- 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
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- 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
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- 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
- C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
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- 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
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2265/00—Forming parameters
- B21B2265/10—Compression, e.g. longitudinal compression
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- Mechanical Engineering (AREA)
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- Heat Treatment Of Steel (AREA)
Abstract
The invention relates to a method for controlling surface cracks of rolled 316LN nuclear power steel, which comprises steel billet coating control, steel billet heating control and steel billet rolling control, wherein the steel billet heating control comprises the step of heating a steel billet by adopting a low-temperature steel stewing heating process, and the steel billet heating control comprises a preheating section, a heating section and a soaking section, wherein the heating temperature of the preheating section is less than or equal to 1100 ℃, the heating time of the preheating section is more than or equal to 1.5 hours, the heating temperature of the heating section, the heating section and the soaking section is 1250-1280 ℃, the heating time of the heating section is 1-1.5 hours, the heating time of the heating section is 1.5-2 hours, the heating time of the soaking section is 2-2.5 hours; the billet rolling control includes rolling a billet using a two-pass rolling process, a first pass rolling a billet having an initial thickness to an intermediate billet having an intermediate thickness, and a second pass rolling an intermediate billet to a finished product having a finished product thickness. The method can effectively solve the problem of surface cracks of 316LN nuclear power steel in rolling.
Description
Technical Field
The invention belongs to the technical field of ferrous metallurgy, and relates to a method for controlling surface cracks of 316LN nuclear power steel in rolling.
Background
The 316LN nuclear power steel is a steel grade used on nuclear fusion high-energy power generation equipment, and is prepared by continuous casting and rolling, the magnetic conductivity of the steel grade is required to be less than 1.05, and the structure is complete austenite. 316LN nuclear power steel is characterized in that the Ni and N content is high, for example, the Ni content is more than 10 percent, and the C + N is more than or equal to 0.15 percent. The content of Ni is improved, the Cr/Ni equivalent is reduced, the rolling thermoplasticity is poor, and cracks are easily formed in a single-phase structure; the increase in the N content, although improving the strength to some extent, makes the rolled surface susceptible to cracking. Therefore, due to the strict requirements of the components of 316LN nuclear power steel, the surface of the steel plate has the problem of crack quality in the rolling process after continuous casting, so that the qualification rate of finished products is reduced.
Disclosure of Invention
In order to overcome the defect and the defect that cracks appear on the rolled surface of 316LN nuclear power steel in the prior art, the invention provides a method for controlling the cracks on the rolled surface of the 316LN nuclear power steel, the problem of the cracks on the rolled surface of the 316LN nuclear power steel is effectively improved through heating control and rolling control in the production process of the 316LN nuclear power steel, the qualification rate of finished products is improved, and the special requirements and use of key projects on materials are met.
The method for controlling the rolling surface cracks of the 316LN nuclear power steel comprises the steps of billet coating control, billet heating control and billet rolling control in the preparation process of the 316LN nuclear power steel, wherein:
the steel billet coating control comprises the steps of carrying out coating treatment before heating a steel billet, and uniformly spraying high-temperature-resistant protective coating on the surface of the steel billet, wherein the thickness of the coating is controlled to be 0.45-0.65 mm;
the steel billet heating control comprises the step of heating the coated steel billet in a heating furnace by adopting a low-temperature steel stewing heating process, wherein the low-temperature steel stewing heating process comprises four heating stages including a preheating stage, a first heating stage, a second heating stage and a soaking stage, the heating temperature of the preheating stage is controlled to be less than or equal to 1100 ℃, the heating time of the preheating stage is controlled to be more than or equal to 1.5 hours, the heating temperatures of the first heating stage, the second heating stage and the soaking stage are controlled to be 1250-1280 ℃, the heating time of the first heating stage is controlled to be 1-1.5 hours, the heating time of the second heating stage is controlled to be 1.5-2 hours, the heating time of the soaking stage is controlled to be 2-2.5 hours, and the total furnace standing time is;
the billet rolling control comprises the steps of rolling the heated billet by adopting a two-fire rolling process, and heating and rolling the billet with the initial thickness to an intermediate billet with the intermediate thickness by the first fire rolling; and (3) cooling the intermediate blank, coating the intermediate blank for the second time, heating and rolling the coated intermediate blank to a finished product with the thickness of the finished product by second heat rolling, wherein the rolling pass is controlled to be less than or equal to 18 passes, the initial rolling temperature is controlled to be greater than or equal to 1030 ℃, and the final rolling temperature is controlled to be greater than or equal to 800 ℃.
Preferably, in the method for controlling the surface cracks of the 316LN nuclear power steel in rolling, the coating is a composite coating prepared from nano silicon oxide, nano aluminum oxide, composite aluminum sol, nano silicon sol and the like.
Preferably, in the method for controlling the surface cracks of the 316LN nuclear power steel in rolling, in the billet heating control, the heating time of the preheating section is controlled to be 1.5h, the heating time of the first heating section is controlled to be 1h, the heating time of the second heating section is controlled to be 1.5h, and the heating time of the soaking section is controlled to be 2 h.
Preferably, in the method for controlling the surface cracks of the 316LN nuclear power steel in rolling, the initial thickness is 200mm, the intermediate thickness is 120-150 mm, and the finished product thickness is 6-30 mm in the billet rolling control.
Preferably, in the method for controlling the surface cracks of the 316LN nuclear power steel in rolling, in the billet rolling control, the flow of the roller cooling water is controlled according to 10% of the maximum flow, the temperature is controlled to be higher than or equal to 1030 ℃ in the process of temperature-controlled rolling, the finishing temperature is controlled to be higher than or equal to 800 ℃, and the high-pressure cooling water only descales once.
Preferably, the method for controlling the rolling surface cracks of the 316LN nuclear power steel further comprises the steps of carrying out solid solution treatment, straightening, shot blasting, acid pickling and coping treatment after the rolling of the steel billet is finished, wherein the temperature of the solid solution heat treatment is controlled to be 1050-1150 ℃, and the time of the solid solution heat treatment is controlled to be 2-4 min/mm.
Preferably, in the method for controlling surface cracks of 316LN nuclear power steel in rolling, the chemical components of the 316LN nuclear power steel are controlled as follows according to weight percentage: less than or equal to 0.030 percent of C, less than or equal to 2.00 percent of Mn, less than or equal to 0.75 percent of Si, less than or equal to 0.03 percent of P, less than or equal to 0.020 percent of S, and the mass ratio of Cr: 16.00-18.50%, Ni: 10.00 to 14.00%, Mo: 2.00-3.00%, Cu is less than or equal to 0.300%, Co is less than or equal to 0.100%, N: 0.120-0.170%, C + N not less than 0.150%, and the balance of Fe.
According to the method for controlling the rolling surface cracks of the 316LN nuclear power steel, the heating of the steel billet and the rolling of the steel billet are controlled in the process of preparing the 316LN nuclear power steel, so that the problem of the rolling surface cracks of the 316LN nuclear power steel is effectively solved, the qualification rate of finished products is improved, and the special requirements and use of key projects on materials are met.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Definition 1: the 316LN nuclear power steel refers to nuclear power steel added with N element in 316L steel, and the chemical components of the steel in percentage by weight are as follows: less than or equal to 0.030 percent of C, less than or equal to 2.00 percent of Mn, less than or equal to 0.75 percent of Si, less than or equal to 0.03 percent of P, less than or equal to 0.020 percent of S, and the mass ratio of Cr: 16.00-18.50%, Ni: 10.00 to 14.00%, Mo: 2.00-3.00%, Cu is less than or equal to 0.300%, Co is less than or equal to 0.100%, N: 0.120-0.170%, C + N not less than 0.150%, and the balance of Fe.
The general preparation process of 316LN nuclear power steel comprises the following steps: continuous casting → coating of steel billet → heating of steel billet → rolling of steel billet → solution treatment → straightening, shot blasting → acid pickling → coping → packaging delivery. The method for controlling the rolling surface cracks of the 316LN nuclear power steel mainly aims at controlling billet coating, billet heating and billet rolling in the preparation process, and comprises the following steps:
the steel billet coating control specifically comprises the following steps: coating treatment is carried out before the billet is heated, high-temperature resistant protective coating, such as a composite coating prepared from nano silicon oxide, nano aluminum oxide, composite aluminum sol, nano silicon sol and the like, is uniformly sprayed on the surface of the billet, and the thickness of the coating is controlled to be 0.45-0.65 mm, so that heating cracks caused by oxidation and surface overheating of the surface of the billet in the heating process are prevented;
the heating control of the steel billet comprises the following specific steps: heating the coated steel billet in a heating furnace by adopting a low-temperature steel stewing and heating process, wherein the low-temperature steel stewing and heating process comprises four heating stages including a preheating section, a first heating section, a second heating section and a soaking section, wherein the heating temperature of the preheating section is controlled to be less than or equal to 1100 ℃, the heating time of the preheating section is controlled to be more than or equal to 1.5 hours, the heating temperatures of the first heating section, the second heating section and the soaking section are controlled to be 1250-1280 ℃, the heating time of the first heating section is controlled to be 1-1.5 hours, the heating time of the second heating section is controlled to be 1.5-2 hours, and the heating time of the soaking section is controlled to be 2-2.5 hours;
controlling the rolling of the steel billet, which specifically comprises the following steps: rolling the heated billet by adopting a two-fire rolling process, wherein the billet with the initial thickness is coated by the first fire rolling process, and is heated and rolled to an intermediate billet with the intermediate thickness; and (3) secondary coating is carried out on the intermediate blank after the intermediate blank is cooled, and the coated intermediate blank is heated and rolled to a finished product with the thickness of the finished product by second fire rolling. The rolling pass and the rolling temperature are not specially regulated and required to be controlled during the first heat rolling, the rolling pass is controlled to be less than or equal to 18 passes during the second heat rolling, the initial rolling temperature is controlled to be more than or equal to 1030 ℃, the final rolling temperature is controlled to be more than or equal to 800 ℃, and rolling cracks are prevented from being generated during low-temperature rolling.
Preferably, in the control of billet rolling, the cooling water of the roller is controlled according to 10 percent of the maximum flow, the temperature is controlled to be higher than or equal to 1030 ℃ in the process of temperature-controlled rolling, the finishing temperature is controlled to be higher than or equal to 800 ℃, and the high-pressure cooling water only descales once to ensure higher rolling temperature.
In one embodiment, the heating time of the preheating section is controlled to be 1.5h, the heating time of the heating section is controlled to be 1h, the heating time of the heating section is controlled to be 1.5h, and the heating time of the soaking section is controlled to be 2 h.
In one embodiment, the initial thickness is 200mm, the intermediate thickness is 120-150 mm, and the finished product thickness is 6-30 mm.
Optionally, the method for controlling the surface cracks of the 316LN nuclear power steel rolling also comprises the steps of solution treatment, straightening and shot blasting, acid pickling and coping treatment after the billet rolling is finished. The temperature of the solid solution heat treatment is 1050-1150 ℃, and the time of the solid solution heat treatment is 2-4 min/mm. The product quality of the 316LN nuclear power steel can be further improved through solid solution treatment, straightening and shot blasting, acid pickling and coping treatment.
The method for controlling the surface cracks of the 316LN nuclear power steel rolling effectively solves the problem of surface cracks of the 316LN nuclear power steel rolling through heating and rolling control, improves the qualification rate of finished products, and meets the special requirements and use of key projects on materials.
It should be noted that the above embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or alterations do not depart from the spirit of the invention.
Claims (7)
1. A method for controlling surface cracks of rolled 316LN nuclear power steel comprises billet coating control, billet heating control and billet rolling control in a 316LN nuclear power steel preparation procedure, wherein:
the steel billet coating control comprises the steps of carrying out coating treatment before heating a steel billet, and uniformly spraying high-temperature-resistant protective coating on the surface of the steel billet, wherein the thickness of the coating is controlled to be 0.45-0.65 mm;
the steel billet heating control comprises the step of heating the coated steel billet in a heating furnace by adopting a low-temperature steel stewing heating process, wherein the low-temperature steel stewing heating process comprises four heating stages including a preheating stage, a first heating stage, a second heating stage and a soaking stage, the heating temperature of the preheating stage is controlled to be less than or equal to 1100 ℃, the heating time of the preheating stage is controlled to be more than or equal to 1.5 hours, the heating temperatures of the first heating stage, the second heating stage and the soaking stage are controlled to be 1250-1280 ℃, the heating time of the first heating stage is controlled to be 1-1.5 hours, the heating time of the second heating stage is controlled to be 1.5-2 hours, the heating time of the soaking stage is controlled to be 2-2.5 hours, and the total furnace standing time is;
the billet rolling control comprises the steps of rolling the heated billet by adopting a two-fire rolling process, and heating and rolling the billet with the initial thickness to an intermediate billet with the intermediate thickness by the first fire rolling; and (3) cooling the intermediate blank, coating the intermediate blank for the second time, heating and rolling the coated intermediate blank to a finished product with the thickness of the finished product by second heat rolling, wherein the rolling pass is controlled to be less than or equal to 18 passes, the initial rolling temperature is controlled to be greater than or equal to 1030 ℃, and the final rolling temperature is controlled to be greater than or equal to 800 ℃.
2. The method for controlling the rolling surface cracks of 316LN nuclear power steel as recited in claim 1, wherein said coating is a composite coating formulated from nano silica-nano alumina-composite alumina sol-nano silica sol, etc.
3. The method for controlling surface cracks of 316LN nuclear steel rolls according to claim 1, wherein in the billet heating control, the preheating zone heating time is controlled to 1.5h, the heating zone heating time is controlled to 1h, the heating zone heating time is controlled to 1.5h, and the soaking zone heating time is controlled to 2 h.
4. The method for controlling surface cracks of 316LN nuclear power steel rolling according to claim 1, wherein in said billet rolling control, said initial thickness is 200mm, said intermediate thickness is 120-150 mm, and said finished thickness is 6-30 mm.
5. The method of claim 1, wherein in the billet rolling control, the roll cooling water is controlled at 10% of the maximum flow rate, the temperature is controlled to be higher than or equal to 1030 ℃ in the beginning rolling temperature, the finishing rolling temperature is controlled to be higher than or equal to 800 ℃, and the high-pressure cooling water only removes the scale once.
6. The method for controlling surface cracks in rolling of 316LN nuclear power steel according to any of claims 1 to 5, wherein the chemical composition of the 316LN nuclear power steel is controlled as follows by weight percent: less than or equal to 0.030 percent of C, less than or equal to 2.00 percent of Mn, less than or equal to 0.75 percent of Si, less than or equal to 0.03 percent of P, less than or equal to 0.020 percent of S, and the mass ratio of Cr: 16.00-18.50%, Ni: 10.00 to 14.00%, Mo: 2.00-3.00%, Cu is less than or equal to 0.300%, Co is less than or equal to 0.100%, N: 0.120-0.170%, C + N not less than 0.150%, and the balance of Fe.
7. The method for controlling surface cracks in rolling of 316LN nuclear power steel, as claimed in any of claims 1 to 5, wherein after the completion of billet rolling, solution treatment, straightening and shot blasting, pickling and coping treatment are performed, wherein the solution heat treatment temperature is controlled to 1050-1150 ℃ and the solution heat treatment time is controlled to 2-4 min/mm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113492153A (en) * | 2021-07-16 | 2021-10-12 | 山西太钢不锈钢股份有限公司 | Rolling method of austenitic stainless steel and austenitic stainless steel for electronic components |
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