CN113088824A - High-construction steel and manufacturing method thereof - Google Patents
High-construction steel and manufacturing method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 63
- 239000010959 steel Substances 0.000 title claims abstract description 63
- 238000010276 construction Methods 0.000 title claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 7
- 239000000126 substance Substances 0.000 claims abstract description 7
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 6
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 6
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 6
- 229910052802 copper Inorganic materials 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 5
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 4
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 4
- 229910052742 iron Inorganic materials 0.000 claims abstract description 3
- 238000001816 cooling Methods 0.000 claims description 36
- 238000000034 method Methods 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 11
- 238000003723 Smelting Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000005098 hot rolling Methods 0.000 claims description 6
- 238000009749 continuous casting Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 238000007670 refining Methods 0.000 claims description 3
- 230000008570 general process Effects 0.000 claims description 2
- 235000008216 herbs Nutrition 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 11
- 239000000463 material Substances 0.000 description 8
- 229910000734 martensite Inorganic materials 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 229910000746 Structural steel Inorganic materials 0.000 description 6
- 238000005096 rolling process Methods 0.000 description 6
- 239000011651 chromium Substances 0.000 description 5
- 239000010949 copper Substances 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 238000001556 precipitation Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000003466 welding Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 235000007631 Cassia fistula Nutrition 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 240000004752 Laburnum anagyroides Species 0.000 description 1
- 206010039897 Sedation Diseases 0.000 description 1
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000036280 sedation Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
Classifications
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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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
-
- 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
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
-
- 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
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses high building steel which comprises the following chemical components in percentage by weight: c: 0.05-0.20%, N is less than or equal to 0.025%, and Si: 0.05-0.30%, Mn 0.50-0.80%, P not more than 0.045%, S not more than 0.045%, Cr 3.5-4.5%, Ni 1.0-2.0%, B0.0003-0.0010%, Al 0.4-0.6%, Cu: 0.04-0.06%, and the balance of iron and unavoidable impurities. According to the invention, by adjusting the numerical range of the components of the conventional high-construction steel, the contents of Cr and Ni elements are increased, the content of Al is increased by more than ten times of the original content, the consumption of Cu is reduced, the surface processing quality and the strength of the product are ensured, and thus the yield of the high-construction steel is improved and the thickness of the high-construction steel can be reduced.
Description
Technical Field
The invention relates to a stainless steel smelting process, in particular to high-construction steel and a manufacturing method thereof.
Background
The high-construction steel greatly saves the material consumption due to the good physical properties, can ensure the safety of a building structure, and is the trend of the current building materials. The materials used for high-rise building structures generally require high strength and toughness and good weldability, so that preheating is not needed before welding and stress relief treatment is not needed after welding, and if the materials have certain heat resistance, the application field can be further widened.
At present, the high-strength structural steel for buildings mainly comprises Q550GJ, Q620GJ and Q690GJ types of steel, the maximum value of the yield strength is 690, the tensile strength range is 690-860, the elongation after fracture is more than or equal to 14, the strength is improved along with the increase of the thickness, but the elongation performance is poor, and in order to ensure the mechanical property of a steel plate, the thickness of the structural steel plate for high-rise buildings is usually not less than 8mm, so that the weight of the structural steel plate cannot be further reduced. Meanwhile, cracks are easily generated on the surface of the steel continuous casting billet for high-rise buildings produced by most domestic steel mills, and the cracks are amplified in the heating and rolling processes of steel rolling to generate larger cracks and reduce the performance of a steel plate. Therefore, it is a subject to be studied how to control the surface processing quality of a thin high-construction steel sheet and to combine the strength, yield strength and elongation of a thick sheet.
Disclosure of Invention
The invention aims to provide high-construction steel.
The technical scheme for realizing the purpose of the invention is as follows: the high-construction steel comprises the following chemical components in percentage by weight: c: 0.05-0.20%, N is less than or equal to 0.025%, and Si: 0.05-0.30%, Mn 0.50-0.80%, P not more than 0.045%, S not more than 0.045%, Cr 3.5-4.5%, Ni 1.0-2.0%, B0.0003-0.0010%, Al 0.4-0.6%, Cu: 0.04-0.06%, and the balance of iron and unavoidable impurities.
In the component design of the invention:
c: 0.05-0.20%, N: less than or equal to 0.025 percent to control the martensite content in the slab cooling process and reduce brittle phase. Wherein, nitrogen is a gap atom of the steel grade, the content of the nitrogen can influence the plasticity of the material, and the N is required to be less than or equal to 0.025 percent in the component design.
3.5-4.5% of Cr, ensures the strength of the steel, has certain corrosion resistance, cannot play a role when being too low, and is too high, thereby relating to the cost problem.
Si: 0.20-0.30%, silicon is a parameter related to the strength of a finished product, and in addition, a certain silicon content ensures that molten steel is not oxidized excessively.
0.4 to 0.6 percent of Al. The Al content of the same type of high-construction steel in the market is 0.02-0.04%, and the Al element is used for fixing nitrogen in the steel and protecting boron. However, the inventor finds that the insufficient Al can cause the problem of slab surface cracks in the machining process in the structural steel thinning research. The invention improves the generation amount of ferrite and inhibits the generation of carbide by improving the content of Al element, thereby reducing the generation of martensite to the maximum extent and reducing the generation of cracks caused by over-quick cooling of a plate blank when the cooling speed is relatively high. However, under the condition of ensuring single phase of a plate blank under the quenching condition, the surface crack probability of the plate blank is increased due to the over-high content of a certain amount of aluminum element, so that the content range is limited to 0.4-0.6%. Meanwhile, the aluminum content is kept in the range, the oxygen content in the molten steel is reduced, the purity of the molten steel is improved, and magnesium-aluminum systems in the molten steel are mixed in the plastic deformable range.
Cu: 0.04-0.06%, copper element can increase the proportion of goldenrain crystal, the surface area of crystal grain is increased, and the strength of the material is improved. Too high a content increases the production cost.
Mn: the molten steel is prevented from being oxidized.
Ni: the corrosion resistance is improved.
The contents of P and S are controlled within 0.045%, and the P and the S are impurity elements in the steel, so that the ductility and the welding performance can be obviously improved by controlling the contents.
And B, improving the bonding force of the grain boundary and reducing the occurrence of edge crack.
According to the invention, by adjusting the numerical range of the components of the conventional high-construction steel, the contents of Cr and Ni elements are increased, the content of Al is increased by more than ten times of the original content, the consumption of Cu is reduced, the surface processing quality and the strength of the product are ensured, and thus the yield of the high-construction steel is improved and the thickness of the high-construction steel can be reduced.
The invention also aims to provide a manufacturing method of the high-construction steel, which comprises the following steps:
(1) carrying out converter smelting according to the chemical components of the first object of the invention;
(2) refining;
(3) continuous casting: the temperature of the tundish is controlled to be 1535-1545 ℃; setting according to the liquidus of the molten steel at 25-30 ℃ to ensure the internal quality of the plate blank;
(4) slowly cooling or heaping the steel billet;
(5) hot rolling: heating the steel billet in a heating furnace at 1150-1200 ℃, and finishing at 850-920 ℃; within the finish rolling temperature range, the steel grade is rolled in an austenite single-phase region, and the generation of hot rolling defects is reduced;
(6) carrying out laminar cooling and coiling to obtain hot-rolled strip steel: wherein the coiling temperature is 550-650 ℃. The coiling temperature can reduce the precipitation of carbide and increase the hardness of the material, and the toughness of the material is reduced when the coiling temperature exceeds the range, so that the mechanical property of the product is poor;
(7) and air-cooling to room temperature.
The process steps are not limited by the process parameters, and all the process parameters are the conventional general process parameters.
The high-construction steel prepared by the second aim of the invention has high strength, excellent extensibility and surface processing quality, has excellent corrosion resistance, can greatly reduce steel plates with the same performance requirements, replaces part of existing products in the fields of construction structural steel and the like, and has wide application prospect.
Detailed Description
The following is a detailed description of preferred embodiments of the invention.
Example 1:
the high-construction steel comprises the following chemical components in percentage by weight: c: 0.141%, Si: 0.28%, Mn: 0.76%, P: 0.032, S: 0.013%, Cu: 0.047%, Cr: 3.63%, Ni: 1.38%, N: 0.020%, Al: 0.42%, B: 0.0008% and the balance Fe and unavoidable impurities.
The manufacturing process of the high-construction steel comprises the following steps:
(1) carrying out converter smelting according to the chemical components;
(2) refining: fine adjustment of components is carried out in an LF furnace, the temperature is adjusted, when smelting components meet requirements, an Al wire is fed, the wire feeding length is 200 m/furnace, a B wire is fed, the wire feeding length is 10-15 m/furnace, argon is blown after a ferroboron wire is fed, soft stirring is carried out for 10-15 min, and then the sedation time is kept to be more than or equal to 10 min;
(3) continuous casting: the temperature of the tundish is controlled to be 1535-1545 ℃;
(4) slowly cooling or heaping the steel billet;
(5) hot rolling: the slab is fed into a heating furnace in a hot feeding mode, the precipitation of martensite in the rapid cooling process of the slab is reduced to the maximum extent, the billet is heated in the heating furnace at 1150 ℃, the finish rolling temperature is 880 ℃, the carbide is ensured to be completely dissolved into a matrix, and the rolling in a single-phase region is ensured;
(6) carrying out laminar cooling and coiling to obtain hot-rolled strip steel: wherein the coiling temperature is 630 ℃, and carbide precipitation is reduced;
(7) air cooling to room temperature: martensite precipitation is reduced to the maximum extent.
The examples 2 to 16 adopt the same smelting method as the examples, and are different in the ratio of each component, which is specifically shown in table 1. Wherein table 1 simultaneously gives the compositions of the structural steels which have been developed so far as comparative examples.
Table 1 units: weight percent of
| Composition (I) | C | Si | Mn | P | S | Cu | Ni | Cr | N | Al | B |
| Example 1 | 0.141 | 0.28 | 0.76 | 0.032 | 0.013 | 0.047 | 1.38 | 3.63 | 0.020 | 0.42 | 0.0008 |
| Example 2 | 0.115 | 0.2 | 0.97 | 0.04 | 0.009 | 0.046 | 1.37 | 3.89 | 0.023 | 0.45 | 0.0005 |
| Example 3 | 0.141 | 0.23 | 0.83 | 0.035 | 0.026 | 0.047 | 1.41 | 3.98 | 0.016 | 0.48 | 0.0006 |
| Example 4 | 0.138 | 0.16 | 0.85 | 0.036 | 0.035 | 0.044 | 1.39 | 3.95 | 0.017 | 0.51 | 0.0006 |
| Example 5 | 0.15 | 0.18 | 0.93 | 0.04 | 0.041 | 0.044 | 1.39 | 4.15 | 0.030 | 0.40 | 0.0005 |
| Example 6 | 0.183 | 0.15 | 0.84 | 0.042 | 0.049 | 0.046 | 1.39 | 3.87 | 0.040 | 0.52 | 0.0005 |
| Example 7 | 0.089 | 0.28 | 0.65 | 0.033 | 0.039 | 0.051 | 1.38 | 3.13 | 0.022 | 0.55 | 0.0005 |
| Example 8 | 0.085 | 0.32 | 0.72 | 0.036 | 0.045 | 0.051 | 1.37 | 3.36 | 0.019 | 0.44 | 0.0005 |
| Example 9 | 0.094 | 0.32 | 0.78 | 0.036 | 0.027 | 0.04 | 1.38 | 3.6 | 0.022 | 0.50 | 0.0005 |
| Example 10 | 0.146 | 0.27 | 0.76 | 0.037 | 0.029 | 0.049 | 1.38 | 3.55 | 0.026 | 0.47 | 0.0007 |
| Example 11 | 0.111 | 0.11 | 0.8 | 0.037 | 0.033 | 0.041 | 1.41 | 3.67 | 0.027 | 0.45 | 0.0008 |
| Example 12 | 0.156 | 0.2 | 0.82 | 0.04 | 0.033 | 0.042 | 1.43 | 4.01 | 0.015 | 0.42 | 0.0005 |
| Example 13 | 0.123 | 0.21 | 0.74 | 0.036 | 0.04 | 0.043 | 1.43 | 3.68 | 0.033 | 0.48 | 0.0007 |
| Example 14 | 0.169 | 0.07 | 0.71 | 0.04 | 0.051 | 0.047 | 1.37 | 3.46 | 0.039 | 0.45 | 0.0005 |
| Example 15 | 0.121 | 0.02 | 0.73 | 0.035 | 0.048 | 0.047 | 1.44 | 3.69 | 0.025 | 0.46 | 0.0005 |
| Example 16 | 0.159 | 0.2 | 0.74 | 0.041 | 0.061 | 0.044 | 1.43 | 3.48 | 0.024 | 0.56 | 0.0006 |
| Comparative example 1 | 0.150 | 0.40 | 1.70 | 0.023 | 0.021 | 0.004 | 0.50 | 1.20 | 0.010 | 0.001 | 0.0005 |
| Comparative example 2 | 0.139 | 0.50 | 1.80 | 0.031 | 0.030 | 0.005 | 0.42 | 1.10 | 0.012 | 0.002 | 0.0007 |
Table 2 shows the main process parameters of examples 1 to 16 and comparative examples.
TABLE 2
The mechanical properties and surface finish qualities of the finished products of examples 1-16 and comparative examples 1-2 are shown in table 3, wherein the mechanical properties are obtained from hot rolled sheets.
TABLE 3
| Numbering | Cooling method | Specification/mm | Yield strength | Tensile strength | Elongation after fracture | Cold bending | Hardness of | Surface cracking |
| Example 1 | Heap cooling | 6.0*1015 | 750 | 980 | 18 | Combination of Chinese herbs | 78 | Is free of |
| Example 2 | Heap cooling | 6.0*1015 | 760 | 985 | 17 | Combination of Chinese herbs | 75.5 | Is free of |
| Example 3 | Heap cooling | 6.0*1015 | 765 | 970 | 17.5 | Combination of Chinese herbs | 79 | Is free of |
| Example 4 | Heap cooling | 6.0*1015 | 782 | 1013 | 16.5 | Combination of Chinese herbs | 80 | Is free of |
| Example 5 | Heap cooling | 6.0*1015 | 770 | 978 | 19.5 | Combination of Chinese herbs | 79.5 | Is free of |
| Example 6 | Heap cooling | 6.0*1015 | 785 | 990 | 18.5 | Combination of Chinese herbs | 80.5 | Is free of |
| Example 7 | Heap cooling | 6.0*1015 | 755 | 960 | 18 | Combination of Chinese herbs | 77.5 | Is free of |
| Example 8 | Heap cooling | 6.0*1015 | 803 | 1002 | 17.5 | Combination of Chinese herbs | 76.5 | Is free of |
| Example 9 | Heap cooling | 6.0*1015 | 806 | 997 | 16.6 | Combination of Chinese herbs | 74.5 | Is free of |
| Example 10 | Air cooling | 6.0*1015 | 810 | 1018 | 15.5 | Combination of Chinese herbs | 81.5 | Is free of |
| Example 11 | Air cooling | 6.0*1015 | 820 | 1026 | 15.0 | Combination of Chinese herbs | 82.0 | Is free of |
| Example 12 | Air cooling | 6.0*1015 | 830 | 1008 | 16.0 | Combination of Chinese herbs | 80.5 | Is free of |
| Example 13 | Water cooling | 6.0*1015 | 850 | 1020 | 14.5 | Incompatibility of | 83.5 | Is free of |
| Example 14 | Water cooling | 6.0*1015 | 835 | 1035 | 15.0 | Incompatibility of | 82.5 | Is free of |
| Example 15 | Water cooling | 6.0*1015 | 840 | 1050 | 15.5 | Incompatibility of | 84.5 | Is free of |
| Example 16 | Water cooling | 6.0*1015 | 870 | 1050 | 15.5 | Incompatibility of | 84.5 | Is free of |
| Comparative example 1 | Heap cooling | 8.0*1015 | 805 | 875 | 14.5 | Combination of Chinese herbs | 80.5 | Is provided with |
| Comparative example 2 | Heap cooling | 8.0*1015 | 835 | 860 | 15.0 | Combination of Chinese herbs | 77.5 | Is provided with |
The results of comparing the weather resistance of the finished products of examples 1 to 4 and comparative examples 1 to 2 with Q235 are shown in Table 4.
TABLE 4
| Material | Corrosion rate, g/m 2. h | Weather resistance is multiple of Q235 |
| Example 1 | 1.05 | 3.78 |
| Example 2 | 1.02 | 4.02 |
| Example 3 | 1.12 | 4.22 |
| Example 4 | 1.08 | 4.15 |
| Comparative example 1 | 1.82 | 2.21 |
| Comparative example 2 | 1.89 | 2.25 |
| Q235B | 4.15 | 1.00 |
As can be seen from Table 3, compared with comparative examples 1-2, the sheet products of examples 1-16 of the present invention having a thickness of 6mm had yield strengths not lower than those of the existing high construction steels having a thickness of 8mm, tensile strengths superior to those of the existing high construction steels having a thickness of 8mm, no significant decrease in elongation after fracture, and no cracks on the surfaces. Table 4 shows that the corrosion resistance of the high-construction steel obtained by the invention is also greatly superior to that of the existing high-strength steel product. Therefore, the performance of the high-construction steel is improved, the steel plates with the same performance requirements can be greatly thinned, and then partial existing products are replaced in the fields of building structural steel and the like, so that the high-construction steel has a wide market prospect.
The converter-LF-CC smelting and the continuous rolling mill hot rolling adopted by the embodiment of the invention can also select other conventional smelting processes and equipment in the field of steel smelting in the actual production.
In order to maintain high strength, the steel grade has higher chromium and carbon elements, which can cause the generation of martensite in the cooling process of a steel billet or a steel coil, so that the inhibition of the generation of martensite brittle phase is a key point of the production process of the steel grade. Therefore, the C content is controlled within the required range in the smelting implementation process, the conventional increase of the Al element content in the high-construction steel is broken through, the generation amount of ferrite is increased, the generation of carbide is inhibited, the generation of martensite is reduced to the greatest extent when the cooling speed is high, and the generation of cracks caused by the over-quick cooling of the plate blank is reduced. After the billet is produced, the hot-feeding hot-rolling mode is adopted as much as possible, and if the site does not have conditions, the billet is slowly cooled. In the production process of the steel strip, a laminar cooling mode is required, and meanwhile, the produced hot steel strip is slowly cooled in the air.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent flow transformations made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (2)
1. The high-construction steel is characterized in that: the weight percentage of the chemical components is as follows: c: 0.05-0.20%, N is less than or equal to 0.025%, and Si: 0.05-0.30%, Mn 0.50-0.80%, P not more than 0.045%, S not more than 0.045%, Cr 3.5-4.5%, Ni 1.0-2.0%, B0.0003-0.0010%, Al 0.4-0.6%, Cu: 0.04-0.06%, and the balance of iron and unavoidable impurities.
2. A manufacturing method of high building steel comprises the following steps:
(1) converter smelting according to the chemical composition of claim 1;
(2) refining;
(3) continuous casting: the temperature of the tundish is controlled to be 1535-1545 ℃;
(4) slowly cooling or heaping the steel billet;
(5) hot rolling: heating the steel billet in a heating furnace at 1150-1200 ℃, and finishing at 850-920 ℃;
(6) carrying out laminar cooling and coiling to obtain hot-rolled strip steel: wherein the coiling temperature is 550-650 ℃;
(7) air cooling to room temperature;
the process steps are not limited by the process parameters, and all the process parameters are the conventional general process parameters.
Priority Applications (1)
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| CN114395692A (en) * | 2022-01-27 | 2022-04-26 | 宝钢德盛不锈钢有限公司 | Production method of 200-series stainless steel 2B cold-rolled sheet for mirror surface plate |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103290335A (en) * | 2013-05-21 | 2013-09-11 | 马钢(集团)控股有限公司 | High-strength and high-corrosion-resistance steel plate material with yield strength of 900 MPa and production method thereof |
| CN108929987A (en) * | 2018-06-28 | 2018-12-04 | 武汉钢铁有限公司 | A kind of 460MPa grades of cold rolling micro-alloy high-strength steel and its manufacturing method |
| CN112522577A (en) * | 2019-09-19 | 2021-03-19 | 宝山钢铁股份有限公司 | High-corrosion-resistance steel and manufacturing method thereof |
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| CN103290335A (en) * | 2013-05-21 | 2013-09-11 | 马钢(集团)控股有限公司 | High-strength and high-corrosion-resistance steel plate material with yield strength of 900 MPa and production method thereof |
| CN108929987A (en) * | 2018-06-28 | 2018-12-04 | 武汉钢铁有限公司 | A kind of 460MPa grades of cold rolling micro-alloy high-strength steel and its manufacturing method |
| CN112522577A (en) * | 2019-09-19 | 2021-03-19 | 宝山钢铁股份有限公司 | High-corrosion-resistance steel and manufacturing method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114395692A (en) * | 2022-01-27 | 2022-04-26 | 宝钢德盛不锈钢有限公司 | Production method of 200-series stainless steel 2B cold-rolled sheet for mirror surface plate |
| CN114395692B (en) * | 2022-01-27 | 2023-07-07 | 宝钢德盛不锈钢有限公司 | Production method of 200-series stainless steel 2B cold-rolled sheet for mirror plate |
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