CN112593149A - Production process for controlling surface cracks of microalloyed hot-rolled round steel - Google Patents
Production process for controlling surface cracks of microalloyed hot-rolled round steel Download PDFInfo
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- CN112593149A CN112593149A CN202011344548.XA CN202011344548A CN112593149A CN 112593149 A CN112593149 A CN 112593149A CN 202011344548 A CN202011344548 A CN 202011344548A CN 112593149 A CN112593149 A CN 112593149A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 59
- 239000010959 steel Substances 0.000 title claims abstract description 59
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 238000005096 rolling process Methods 0.000 claims abstract description 68
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000001816 cooling Methods 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 238000005266 casting Methods 0.000 claims abstract description 12
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 7
- 239000000956 alloy Substances 0.000 claims abstract description 7
- 230000008569 process Effects 0.000 claims abstract description 7
- 238000003303 reheating Methods 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims description 5
- 238000005728 strengthening Methods 0.000 abstract description 8
- 238000005275 alloying Methods 0.000 abstract description 4
- 238000005336 cracking Methods 0.000 abstract description 3
- 238000001556 precipitation Methods 0.000 abstract description 3
- 238000009851 ferrous metallurgy Methods 0.000 abstract description 2
- 239000006104 solid solution Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B3/02—Rolling special iron alloys, e.g. stainless steel
-
- 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
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
-
- 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
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
-
- 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
-
- 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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
Abstract
The invention belongs to the technical field of ferrous metallurgy and steel rolling, and particularly relates to a production process for controlling surface cracks of microalloyed hot-rolled round steel. The method comprises the following steps: continuously casting the molten steel to obtain a steel billet, and sequentially reheating, roughly rolling, finely rolling, normalizing and cooling the steel billet. The main process parameters are as follows: the initial rolling temperature of the finish rolling is 800-850 ℃, and the final rolling temperature is 750-770 ℃; normalizing heat treatment: because of adopting micro-alloying, in order to ensure that the alloy elements are fully dissolved in solution, normalizing heat treatment is carried out at the temperature of 620-650 ℃. The method has the advantages that the technological parameters in the rolling process are controlled to enable the grain boundary to be precipitated to play a role in precipitation strengthening, the strength is improved, and the qualified mechanical properties are ensured; and through normalizing treatment, the cracking tendency of the component is reduced, the surface cracks of the casting blank are effectively reduced, and the quality of the casting blank product is improved.
Description
Technical Field
The invention belongs to the technical field of ferrous metallurgy and steel rolling, and particularly relates to a production process for controlling surface cracks of microalloyed hot-rolled round steel.
Background
The steel bar is the steel variety with the largest output and sale amount in China at present, the quality level of the steel bar is close to the international advanced level, but the use strength of the steel bar has a certain gap with that of the steel bar in developed countries. The hot rolled ribbed steel bars in China are divided into three strength grades of 400, 500 and 600 according to the strength grade. Through years of popularization and application, the HRB500(E) is generally applied to key engineering projects such as nuclear power, landmark buildings and the like. With the implementation of the issuing of GB 1499.2-2018, higher requirements are put forward for the internal organization of the national standard steel bar in the new standard, and the national standard steel bar products are produced by processes such as water penetration and the like.
With the rapid development of building industry, the requirements of engineering structures such as urban municipal engineering, high-rise buildings and the like on the performance of reinforcing steel bars are higher and higher, the safety and the earthquake resistance of the building structures attract general attention, and the key for improving the safety and the earthquake resistance of the buildings is to improve the strength and the comprehensive performance of the reinforcing steel bars. However, while improving the strength and the overall performance, the problem of cracking is inevitable. In the traditional formula, when the Nb content is too high, the alloy cost is increased, the quality of a casting blank is reduced due to the increase of the Nb, the defects of transverse cracks and the like on the surface of the casting blank are easily caused under the stress action in continuous casting production, and the defects of warping, folding and the like on the surface of a steel bar are caused.
Disclosure of Invention
In view of the problems in the prior art, the invention aims to provide a production process for controlling surface cracks of micro-alloyed hot-rolled round steel, the internal structure of the obtained steel bar is bainite, the mechanical property is stable, and the requirement of industrial batch stable production is met.
The present invention achieves the above-described object by the following technical means.
A production process for controlling surface cracks of microalloyed hot rolled round steel comprises the following steps: continuously casting the molten steel to obtain a steel billet, and sequentially reheating, roughly rolling, finely rolling, normalizing and cooling the steel billet; the method specifically comprises the following steps:
the steel billet comprises the following components by weight: 0.11 to 0.13 wt% of C, 0.10 to 0.20 wt% of Si, 1.75 to 1.85 wt% of Mn, 0.03 to 0.06 wt% of V, 0.01 to 0.02 wt% of Mo, 0.01 to 0.013 wt% of N, 0.03 to 0.06 wt% of Ni, and the balance of Fe and inevitable impurities.
When the billet is reheated, the billet is heated to 950-1100 ℃.
The initial rolling temperature of the rough rolling is 900-950 ℃, and the final rolling temperature of the rough rolling is 870-890 ℃.
The initial rolling temperature of the finish rolling is 800-850 ℃, and the final rolling temperature of the finish rolling is 750-770 ℃.
Normalizing heat treatment: because microalloying is adopted, in order to ensure that alloy elements are fully dissolved in solution, normalizing heat treatment is carried out at the temperature of 620-650 ℃.
The cooling speed is 20-30 ℃/s.
Further, the air conditioner is provided with a fan,
the initial rolling temperature of the finish rolling is 820-830 ℃; the finish rolling temperature of the finish rolling is 760-770 ℃.
The temperature of the normalizing treatment was 620 ℃.
The cooling rate was 30 ℃/s.
The C plays a role in solid solution strengthening, so that the strength of the steel can be improved, the yield ratio can be improved, but the welding performance is affected and the plasticity is reduced due to the excessively high content of the C, so that the content of the C element is 0.22-0.25%, and preferably 0.23-0.25%.
Si plays a role in solid solution strengthening and can improve the strength of the steel, but the toughness and plasticity of the steel are reduced when the content is too high, so that the content of the Si element is 0.40-0.60%, preferably 0.46-0.48% in the invention.
Mn plays a role in solid solution strengthening, so that the strength and hardenability of the steel are obviously improved, the pearlite content is increased, and the yield ratio is improved, but the increase of Mn element can cause the increase of production cost, and meanwhile, the coarseness of crystal grains is promoted; therefore, in the present invention, the content of the Mn element is 1.45 to 1.55%, preferably 1.29 to 1.31%.
V is an important microalloy strengthening element, and the austenite grain refining effect of V is weaker. The element V can separate out nano-scale V (C, N) compounds in the rolling process, increases ferrite nucleation points, prevents ferrite grains from growing, has strong precipitation strengthening effect, and can obviously improve the yield strength of the steel bar.
Both Ni and Mo can play a certain role in solid solution strengthening, the yield strength of the steel is improved, the plasticity and the formability of the steel are reduced, and the recrystallization temperature of the steel can be increased by Mo; therefore, the Ni content is limited to not more than 0.07%, and the Mo content is limited to not more than 0.02%.
The invention has the beneficial effects that:
the method has the advantages that the technological parameters in the rolling process are controlled to enable the grain boundary to be precipitated to play a role in precipitation strengthening, the strength is improved, and the qualified mechanical properties are ensured; and through normalizing treatment, the cracking tendency of the component is reduced, the surface cracks of the casting blank are effectively reduced, and the quality of the casting blank product is improved.
Drawings
FIG. 1 is a photograph of a steel surface prepared by a conventional process.
FIG. 2 is a photograph of a steel surface prepared by the process of the present invention.
Detailed Description
The invention will be further described with reference to the following figures and specific examples, but the scope of the invention is not limited thereto.
Example 1
A production process for controlling surface cracks of microalloyed hot rolled round steel comprises the following steps: continuously casting the molten steel to obtain a steel billet, and sequentially reheating, roughly rolling, finely rolling, normalizing and cooling the steel billet; the method specifically comprises the following steps:
the steel billet comprises the following components by weight: 0.11 to 0.13 wt% of C, 0.10 to 0.20 wt% of Si, 1.75 to 1.85 wt% of Mn, 0.03 to 0.06 wt% of V, 0.01 to 0.02 wt% of Mo, 0.01 to 0.013 wt% of N, 0.03 to 0.06 wt% of Ni, and the balance of Fe and inevitable impurities.
When the billet is reheated, the billet is heated to 950 ℃.
The initial rolling temperature of the rough rolling is 900 ℃, and the final rolling temperature of the rough rolling is 870 ℃.
The initial rolling temperature of the finish rolling is 800 ℃, and the final rolling temperature of the finish rolling is 750 ℃.
Normalizing heat treatment: because of adopting micro-alloying, in order to ensure the alloy elements to be fully dissolved in solution, the normalizing heat treatment is carried out at the temperature of 620 ℃.
The cooling rate was 20 ℃/s.
Example 2
A production process for controlling surface cracks of microalloyed hot rolled round steel comprises the following steps: continuously casting the molten steel to obtain a steel billet, and sequentially reheating, roughly rolling, finely rolling, normalizing and cooling the steel billet; the method specifically comprises the following steps:
the steel billet comprises the following components by weight: 0.11 to 0.13 wt% of C, 0.10 to 0.20 wt% of Si, 1.75 to 1.85 wt% of Mn, 0.03 to 0.06 wt% of V, 0.01 to 0.02 wt% of Mo, 0.01 to 0.013 wt% of N, 0.03 to 0.06 wt% of Ni, and the balance of Fe and inevitable impurities.
When the billet is reheated, the billet is heated to 1000 ℃.
The initial rolling temperature of the rough rolling is 920 ℃, and the final rolling temperature of the rough rolling is 880 ℃.
The initial rolling temperature of the finish rolling is 820 ℃, and the final rolling temperature of the finish rolling is 760 ℃.
Normalizing heat treatment: because of adopting micro-alloying, in order to ensure the alloy elements to be fully dissolved in solution, the normalizing heat treatment is carried out at the temperature of 630 ℃.
The cooling rate was 25 ℃/s.
Example 3
A production process for controlling surface cracks of microalloyed hot rolled round steel comprises the following steps: continuously casting the molten steel to obtain a steel billet, and sequentially reheating, roughly rolling, finely rolling, normalizing and cooling the steel billet; the method specifically comprises the following steps:
the steel billet comprises the following components by weight: 0.11 to 0.13 wt% of C, 0.10 to 0.20 wt% of Si, 1.75 to 1.85 wt% of Mn, 0.03 to 0.06 wt% of V, 0.01 to 0.02 wt% of Mo, 0.01 to 0.013 wt% of N, 0.03 to 0.06 wt% of Ni, and the balance of Fe and inevitable impurities.
When the billet is reheated, the billet is heated to 1100 ℃.
The initial rolling temperature of the rough rolling is 950 ℃, and the final rolling temperature of the rough rolling is 890 ℃.
The initial rolling temperature of the finish rolling is 850 ℃, and the final rolling temperature of the finish rolling is 770 ℃.
Normalizing heat treatment: because of adopting micro-alloying, in order to ensure the alloy elements to be fully dissolved in solution, the normalizing heat treatment is carried out at the temperature of 650 ℃.
The cooling rate was 30 ℃/s.
The present invention is not limited to the above-described embodiments, and any obvious improvements, substitutions or modifications can be made by those skilled in the art without departing from the spirit of the present invention.
Claims (5)
1. A production process for controlling surface cracks of microalloyed hot rolled round steel is characterized by comprising the following steps: continuously casting the molten steel to obtain a steel billet, and sequentially reheating, roughly rolling, finely rolling, normalizing and cooling the steel billet; the method specifically comprises the following steps:
when the steel billet is reheated, heating the steel billet to 950-1100 ℃;
the initial rolling temperature of the rough rolling is 900-950 ℃, and the final rolling temperature of the rough rolling is 870-890 ℃;
the initial rolling temperature of the finish rolling is 800-850 ℃, and the final rolling temperature of the finish rolling is 750-770 ℃;
normalizing heat treatment: because microalloying is adopted, in order to ensure that alloy elements are fully dissolved in solution, normalizing heat treatment is carried out at the temperature of 620-650 ℃;
the cooling speed is 20-30 ℃/s.
2. The process of claim 1, wherein the steel slab comprises, based on the total weight of the steel slab: 0.11 to 0.13 wt% of C, 0.10 to 0.20 wt% of Si, 1.75 to 1.85 wt% of Mn, 0.03 to 0.06 wt% of V, 0.01 to 0.02 wt% of Mo, 0.01 to 0.013 wt% of N, 0.03 to 0.06 wt% of Ni, and the balance of Fe and inevitable impurities.
3. The production process for controlling the surface cracks of the microalloyed hot-rolled round steel as claimed in claim 1, wherein the start rolling temperature of finish rolling is 820-830 ℃; the finish rolling temperature of the finish rolling is 760-770 ℃.
4. The process of claim 1, wherein the normalizing temperature is 620 ℃.
5. The process of claim 1, wherein the cooling rate is 30 ℃/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011344548.XA CN112593149A (en) | 2020-11-26 | 2020-11-26 | Production process for controlling surface cracks of microalloyed hot-rolled round steel |
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| CN202011344548.XA CN112593149A (en) | 2020-11-26 | 2020-11-26 | Production process for controlling surface cracks of microalloyed hot-rolled round steel |
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| CN110184530A (en) * | 2018-07-14 | 2019-08-30 | 江阴兴澄特种钢铁有限公司 | The pipe fitting used under low temperature and acid condition normalizing state steel plate and its manufacturing method |
| CN111440930A (en) * | 2020-03-18 | 2020-07-24 | 江阴兴澄特种钢铁有限公司 | AS NZS 3678-350L 15Z15-Z35 normalized steel plate and manufacturing method thereof |
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2020
- 2020-11-26 CN CN202011344548.XA patent/CN112593149A/en active Pending
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