CN114574776B - Method for producing weather-resistant Q235NHB middle plate by double-stand rolling mill and Q235NHB middle plate - Google Patents
Method for producing weather-resistant Q235NHB middle plate by double-stand rolling mill and Q235NHB middle plate Download PDFInfo
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- CN114574776B CN114574776B CN202210280309.5A CN202210280309A CN114574776B CN 114574776 B CN114574776 B CN 114574776B CN 202210280309 A CN202210280309 A CN 202210280309A CN 114574776 B CN114574776 B CN 114574776B
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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
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
Abstract
The invention provides a method for producing a weather-proof Q235NHB middle plate by a double-stand rolling mill and the Q235NHB middle plate, wherein the method for producing the weather-proof Q235NHB middle plate by the double-stand rolling mill comprises the following process steps: converter smelting, refining, slab continuous casting, inspection, slab heating, descaling, rough rolling, finish rolling, straightening and warehousing and stacking. The weatherable Q235NHB panel was prepared as described above. The product of the invention has good performance and low cost.
Description
Technical Field
The invention relates to the field of metallurgy, in particular to a method for producing a weather-resistant Q235NHB middle plate by using a double-stand rolling mill and the Q235NHB middle plate.
Background
The Q235NHB medium plate is made of atmospheric corrosion resistant steel and is commonly used as a steel structural member which is exposed to the atmosphere for a long time and used in bridges, vehicles, towers, railways, oil derricks, harbor buildings, oil extraction platforms, chemical and petroleum equipment and the like. However, at present, the weather-resistant Q235NHB middle plate is high in production cost, relatively low in performance and low in cost performance, and the use of the product is influenced.
In summary, the following problems exist in the prior art: the weather-proof Q235NHB middle plate is high in production cost, low in performance and low in cost performance.
Disclosure of Invention
The invention provides a method for producing a weather-proof Q235NHB middle plate by using a double-stand rolling mill and the Q235NHB middle plate, and aims to solve the problems of high production cost, relatively low performance and relatively low cost performance of the weather-proof Q235NHB middle plate.
Therefore, the invention provides a method for producing a weather-resistant Q235NHB middle plate by a double-stand rolling mill, which comprises the following process steps of:
smelting in a converter, refining, continuously casting a plate blank, inspecting, heating the plate blank, descaling, roughly rolling, finely rolling, straightening, warehousing and stacking;
the weather-resistant Q235NHB middle plate comprises the following chemical components in percentage by weight:
c:0.05 to 0.09Wt%, si: 0.10-0.20 Wt%, mn:0.45 to 0.55Wt percent, less than or equal to 0.018Wt percent of P, less than or equal to 0.010Wt percent of S, 0.020 to 0.040Wt percent of Alt, 0.25 to 0.35Wt percent of Cu, 0.40 to 0.60Wt percent of Cr and 0.07 to 0.12Wt percent of Ni; the balance of inevitable trace elements;
wherein, in the converter smelting, the S in the molten iron is required to be less than or equal to 0.030Wt%, and the whole process of bottom blowing argon is adopted in the smelting process; refining and deoxidizing the molten steel in an LF furnace without performing calcium treatment;
the heating section is 1030-1230 ℃, the soaking section is 1140-1230 ℃, and the heating time is set to be 2.5-3.5 hours.
Further, the rough rolling initial rolling temperature is 1030-1200 ℃, and the cogging thickness is controlled according to 3 times of the thickness of the finished product.
Furthermore, the start rolling temperature of finish rolling is 850-990 ℃, and the finish rolling temperature is 810-890 ℃.
Furthermore, no post-machine water cooling is used in the production process.
Furthermore, the rolled steel plate is placed in a finished product warehouse for over 24 hours in a heap cooling mode, the residual stress inside and outside the steel plate is naturally eliminated, and the internal and external appearance quality of the steel plate is optimized.
Further, the heap cooling temperature is 220-280 ℃.
The invention also provides a weather-proof Q235NHB middle plate produced by the double-stand rolling mill, which comprises the following chemical components in percentage by weight:
c:0.05 to 0.09Wt%, si: 0.10-0.20 Wt%, mn:0.45 to 0.55Wt percent, less than or equal to 0.018Wt percent of P, less than or equal to 0.010Wt percent of S, 0.020 to 0.040Wt percent of Alt, 0.25 to 0.35Wt percent of Cu, 0.40 to 0.60Wt percent of Cr, and 0.07 to 0.12Wt percent of Ni; the balance of inevitable trace elements;
and the rolled steel plate is cooled in a finished product warehouse in a heaping mode for more than 24 hours.
The method for producing the weather-resistant Q235NHB middle plate by the double-stand rolling mill is adopted.
Further, the thickness of the weather-proof Q235NHB medium plate produced by the double-stand rolling mill is 16-30mm.
Further, the thickness of the weather-resistant Q235NHB medium plate produced by the double-stand rolling mill is 16mm, 20mm or 30mm.
Further, the weather-resistant Q235NHB plate comprises the following chemical components in percentage by weight:
c:0.06Wt%, si:0.15Wt%, mn:0.486Wt%, P:0.014Wt%, S:0.003Wt%, alt 0.024Wt%, cu 0.309Wt%, cr 0.443Wt%, and Ni 0.011Wt%; the balance of inevitable trace elements.
Has the advantages that:
by the component design, the consumption of alloy, especially metal with higher price is reduced under the condition of not reducing the product performance, and the cost is reduced. In addition, by reasonably designing the components, a specific smelting process, a reasonable heating system and a rolling system, the blank is prevented from generating cracks, and the quality of the product is ensured. Reasonable stacking time and temperature are set in a stacking mode, a heat treatment process is omitted, the quality and the performance of products are guaranteed, and the cost is reduced. In the rolling process, the design of the initial rolling and final temperature ranges and rolling passes in the rough rolling stage and the finish rolling stage is required to be reasonable, the advantage of the matching rolling capability of a plate rolling mill in a 2800 double-rack is fully applied, the optimization pass arrangement increases the reduction (rate), the refined crystal grains are achieved, the organization is optimized, and the product performance and the appearance quality are ensured.
The product performance of the invention reaches the yield strength R p0.2 More than or equal to 235MPa, the tensile strength Rm is 360-510 MPa, the elongation A is more than or equal to 25 percent, and the impact energy Ak at 0 ℃ is more than or equal to 47J. Further, the performance yield strength R of the product of the invention p0.2 290MPa or more, 395MPa or more of tensile strength Rm, 33 percent or more of elongation A and 229J or more of impact energy Ak at 0 ℃. Further, the performance yield strength R of the product of the invention p0.2 The tensile strength Rm is 400-415 MPa, the elongation A is 34-47%, and the impact energy Ak at 0 ℃ is 298J, 299J and 307J. The performance of the product exceeds 15-20% of the national standard, and the use of steel can be reduced under the condition of ensuring the strength or performance.
Detailed Description
The present invention will now be described in order to more clearly understand the technical features, objects, and effects of the present invention.
The production method of the weather-resistant Q235NHB middle plate comprises the following steps: (molten iron pretreatment) → converter smelting → argon blowing behind the furnace → LF refining → slab casting (+ electric stirring + soft reduction) → cooling by piling, inspection → slab heating → descaling → rough rolling → finish rolling → straightening → cooling by piling → sampling → steel plate inspection (ultrasonic inspection) → marking → warehousing.
The applicant adopts a 2800mm (2800 mm is the maximum finished product width) double-frame medium plate mill production line to produce the weather-resistant Q235NHB medium plate. The production line of the plate mill in the double racks is discontinuous rolling, comprises a rough rolling mill and a finish rolling mill, wherein the rough rolling mill adopts a longitudinal-transverse-longitudinal mode to repeatedly roll, the thickness (217-220 mm) of the fed material before rough rolling is equal to (1810-1830 mm) in length (1700-2500 mm), the fed material is repeatedly rolled for 8-10 times, the thickness (55-80 mm) of the intermediate billet is equal to (1900-2100 mm), and then the finish rolling is carried out.
And (3) finish rolling is carried out by 6-8 times of repeated rolling to form: the thickness is 16-40mm (the maximum thickness can be produced up to 60mm according to the contract thickness and the actual capacity), the width is 1800-2000mm (the maximum width can be produced up to 2800mm according to the contract width and the actual capacity), and the length is 8000-10000mm (the maximum length can be produced up to 150000mm according to the contract length and the actual capacity).
The key points of converter smelting production are as follows:
A. the S of the molten iron fed into the furnace is required to be less than or equal to 0.030Wt%, and the whole process of bottom blowing argon is adopted in the smelting process.
B. The molten steel is refined and deoxidized in an LF furnace without calcium treatment.
And the stacking and slow cooling process before rolling and after rolling is favorable for reducing the heating cost.
The heating process requires reasonable heating time and temperature range design of each heating section, meets the characteristics of a steel pushing type heating furnace, and requires strict control of the heating temperature of each heating section on site, especially when small-batch multi-steel-grade is produced together. The heating quality of the blank can better meet the rolling requirement, and temperature conditions can be provided for the 'large reduction' pass in the rough rolling stage. The heating temperature control requirement is as follows: the heating section is 1030-1230 ℃, the soaking section is 1140-1230 ℃, and the heating time is set to be 2.5-3.5 hours (about 210 minutes in actual production).
In the rolling process, the design of the initial rolling temperature and the final temperature in the rough rolling stage is required to be reasonable, the matched rolling characteristics of a 2800 double-rack medium plate rolling mill are met, and the temperature in the rolling process is required to be strictly controlled on site. According to the actual temperature of the produced steel, the initial rolling temperature of rough rolling is 1030-1200 ℃, the cogging thickness is controlled according to the thickness of a finished product by 3 times, after the steel is rolled roughly, more than two times of large reduction (20-30 mm) are adopted, the pass reduction is refined, the single-pass reduction rate is increased (the pass reduction rate is generally 10-17%, the pass reduction rate after the large reduction is adopted is 20-30%, such as 20%, 22%, 25%, 28% and 30%), the retention time between passes is reduced as much as possible during rolling, the grains are crushed and refined, and the performance of the finished product is optimized.
In the rolling process, the design of each initial rolling and final temperature range in the finish rolling stage is required to be reasonable, the matched rolling characteristics of a 2800 double-rack medium plate rolling mill are fully applied, the temperature drop in the rolling process is required to be strictly controlled on site, the metallographic structure of a required finished product is ensured, and the product performance can be ensured in the rolling process. According to the actual temperature of the produced steel, the initial rolling temperature of finish rolling is 850-990 ℃, the final rolling temperature is 810-890 ℃, the reduction rate of a single pass is increased (the reduction rate is generally 11-20%, such as 11%, 15%, 18% and 20%) in the finish pass, and after the continuous rolling is finished, no water cooling or post-machine cooling control water curtain is used in the production process.
During normal production, an ultra-fast cooling device after rolling is not needed, and the production consumption is reduced.
And an online automatic meter inspection instrument is applied to a finishing line, so that the surface quality of a product is ensured.
And (3) placing the rolled steel plate into a finished product warehouse for over 24 hours in a heap cooling mode, naturally eliminating the residual stress inside and outside the steel plate, and optimizing the inside and outside appearance quality of the steel plate. The heat treatment is omitted.
After the stack cooling, ultrasonic flaw detection is carried out on the products one by one, and the excellent internal quality is ensured.
The specific embodiment of the invention is shown in the itemized lists of table 1, table 2, table 3 and table 4
Table 1: actual chemical composition of the product (wt%, examples 3 to 5 are same melting numbers of different finished product thicknesses)
| Examples of the invention | C | Si | Mn | P | S | Cu | Cr | Ni | Alt |
| Example 1 | 0.069 | 0.15 | 0.486 | 0.014 | 0.003 | 0.309 | 0.443 | 0.011 | 0.024 |
| Example 2 | 0.070 | 0.14 | 0.471 | 0.014 | 0.003 | 0.295 | 0.442 | 0.009 | 0.023 |
| Example 3 | 0.072 | 0.16 | 0.482 | 0.016 | 0.002 | 0.310 | 0.441 | 0.010 | 0.025 |
| Example 4 | 0.072 | 0.16 | 0.482 | 0.016 | 0.002 | 0.310 | 0.441 | 0.010 | 0.025 |
| Example 5 | 0.072 | 0.16 | 0.482 | 0.016 | 0.002 | 0.310 | 0.441 | 0.010 | 0.025 |
Table 2: specific process parameters of the examples
Table 3 product properties (acceptable):
the metallographic structure, inclusions, band-like structure and grain size of the above 5 examples are shown in Table 4
TABLE 4 metallographic structure, inclusions, banding and grain size of the plates in Q235NHB
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. In order that the components of the present invention may be combined without conflict, it is intended that all equivalent changes and modifications made by those skilled in the art without departing from the spirit and principles of the present invention shall fall within the protection scope of the present invention.
Claims (6)
1. A method for producing a weather-resistant Q235NHB middle plate by a double-stand rolling mill is characterized by comprising the following process steps of:
smelting in a converter, refining, continuously casting a plate blank, inspecting, heating the plate blank, descaling, roughly rolling, finely rolling, straightening, warehousing and stacking;
the weather-resistant Q235NHB middle plate comprises the following chemical components in percentage by weight:
c:0.05 to 0.09wt%, si:0.10 to 0.20wt%, mn:0.45 to 0.486wt%, less than or equal to 0.018wt% of P, less than or equal to 0.010wt% of S, 0.020 to 0.040wt% of Alt, 0.25 to 0.35wt% of Cu, 0.40 to 0.60wt% of Cr and 0.07 to 0.12wt% of Ni; the balance of iron and inevitable trace elements;
wherein, in the converter smelting, the S of the molten iron fed into the converter is required to be less than or equal to 0.030wt%, and the whole process of bottom blowing argon is adopted in the smelting process; refining and deoxidizing the molten steel in an LF furnace without performing calcium treatment;
the heating period is 1030 to 1230 ℃, the soaking period is 1140 to 1230 ℃, and the heating time is set to be 2.5 to 3.5 hours;
the thickness of the weather-resistant Q235NHB middle plate produced by the double-stand rolling mill is 16-30mm;
the rough rolling initial rolling temperature is 1030-1200 ℃, and the cogging thickness is controlled according to 3 times of the thickness of the finished product; after rough rolling and steel rolling, adopting over two times of large reduction of 20-30mm, increasing the single pass reduction rate, wherein the pass reduction rate after the large reduction is adopted is 20-30%;
the initial rolling temperature of finish rolling is 850-990 ℃, and the final rolling temperature is 810-890 ℃; the finish rolling reduction rate is 11 to 20 percent; the production process does not need water cooling or a post-machine controlled cooling water curtain;
the double-stand rolling mill is used for producing a weather-resistant Q235NHB middle plate, and the metallographic structure is as follows: f + P, wabble tissue: 0.5; grain size: 9 to 9.5;
producing a weather-proof Q235NHB middle plate by a double-stand rolling mill;
yield strength R p0.2 The product reaches 295MPa or 300MPa, the tensile strength Rm is 400-415 MPa, the elongation A is 34-47%, the impact energy Ak at 0 ℃ is 298J, 299J and 307J, and the product performance exceeds 15-20% of the national standard.
2. The method for producing the weather-resistant Q235NHB middle plate by the double-stand rolling mill as claimed in claim 1, wherein the rough rolling initial rolling temperature is 1030-1200 ℃, and the cogging thickness is controlled according to 3 times of the thickness of the finished product.
3. The method for producing the weatherable Q235NHB middle plate by the double-stand rolling mill as claimed in claim 1, wherein the finishing rolling start temperature is 850-990 ℃ and the finishing rolling temperature is 810-890 ℃.
4. The method for producing the weather-resistant Q235NHB middle plate by the double-stand rolling mill as claimed in claim 1, wherein no post-machine water cooling is used in the production process.
5. The method for producing the weather-resistant Q235NHB middle plate by the double-stand rolling mill as claimed in claim 1, wherein the rolled steel plate is placed in a finished product warehouse for heap cooling for more than 24 hours, so that the residual stress inside and outside the steel plate is naturally eliminated, and the internal and external appearance quality of the steel plate is optimized.
6. The method for producing the weather-resistant Q235NHB middle plate by the double-stand rolling mill as claimed in claim 1, wherein the heap cooling temperature is 220-280 ℃.
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| CN202310137738.1A CN116288051A (en) | 2022-03-21 | 2022-03-21 | Weather-proof Q235NHB middle plate produced by double-stand rolling mill |
| CN202210280309.5A CN114574776B (en) | 2022-03-21 | 2022-03-21 | Method for producing weather-resistant Q235NHB middle plate by double-stand rolling mill and Q235NHB middle plate |
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| CN115627418B (en) * | 2022-10-18 | 2023-08-29 | 广西柳钢中金不锈钢有限公司 | Nickel-chromium-manganese-containing steel for carbon structure and manufacturing method thereof |
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| CN102345050A (en) * | 2011-07-08 | 2012-02-08 | 南阳汉冶特钢有限公司 | Method for producing flaw detection and performance guaranteed Q235B steel plate with 80-100mm in argon station |
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