CN115896635A - Low-cost high-toughness weather-resistant hot-rolled rod wire and rolling process thereof - Google Patents
Low-cost high-toughness weather-resistant hot-rolled rod wire and rolling process thereof Download PDFInfo
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- CN115896635A CN115896635A CN202211658213.4A CN202211658213A CN115896635A CN 115896635 A CN115896635 A CN 115896635A CN 202211658213 A CN202211658213 A CN 202211658213A CN 115896635 A CN115896635 A CN 115896635A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 25
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 14
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 9
- 239000000126 substance Substances 0.000 claims abstract description 9
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 21
- 238000001816 cooling Methods 0.000 claims description 12
- 229910001566 austenite Inorganic materials 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 4
- 238000001953 recrystallisation Methods 0.000 claims description 2
- 238000010583 slow cooling Methods 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 48
- 239000010959 steel Substances 0.000 abstract description 48
- 239000000463 material Substances 0.000 abstract description 13
- 238000000576 coating method Methods 0.000 abstract description 8
- 239000011248 coating agent Substances 0.000 abstract description 6
- 229910045601 alloy Inorganic materials 0.000 abstract description 4
- 239000000956 alloy Substances 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 239000010949 copper Substances 0.000 description 15
- 230000007797 corrosion Effects 0.000 description 10
- 238000005260 corrosion Methods 0.000 description 10
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 9
- 230000000694 effects Effects 0.000 description 9
- 239000011593 sulfur Substances 0.000 description 9
- 239000011651 chromium Substances 0.000 description 8
- 229910052802 copper Inorganic materials 0.000 description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 7
- 239000010936 titanium Substances 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- 239000011572 manganese Substances 0.000 description 6
- 229910052719 titanium Inorganic materials 0.000 description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 5
- 229910052804 chromium Inorganic materials 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 238000005728 strengthening Methods 0.000 description 5
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 4
- 229910052748 manganese Inorganic materials 0.000 description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- 229910001563 bainite Inorganic materials 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910000734 martensite Inorganic materials 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000010622 cold drawing Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910001562 pearlite Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910000915 Free machining steel Inorganic materials 0.000 description 1
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- 229910000639 Spring steel Inorganic materials 0.000 description 1
- 229910000870 Weathering steel Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000002939 deleterious effect Effects 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000012770 industrial material Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 238000005491 wire drawing Methods 0.000 description 1
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- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention discloses a low-cost high-toughness weather-resistant hot-rolled rod wire, which comprises the following chemical components in percentage by mass: c:0.15 to 0.21wt%, si:0.62 to 0.72wt%, mn:0.80 to 1.0wt%, P: 0.045-0.075 wt%, S less than 0.015wt%, cu:0.1 to 0.5wt%, cr: 0.2-0.5 wt%, cr/Cu = 1-2, and the balance of Fe and inevitable impurities; and microalloying can be carried out according to the requirement, and the chemical components of the microalloying alloy are added with Ti: 0.010-0.035 wt%, V: 0.04-0.07 wt%, ti/V = 1/4-2/4; the invention provides a low-cost high-toughness weather-resistant hot-rolled rod and wire and a rolling process thereof, the product has excellent cold processing property and formability, can meet the requirements of users on coating-free and direct naked use, greatly reduces the cost of steel for the users, greatly reduces high energy consumption and high pollution generated by the original coating material for the society, and is a novel green and environment-friendly material.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a low-cost high-toughness weather-resistant hot-rolled rod wire and a rolling process thereof.
Background
In 2021, the yield of hot rolling lines and bars in China is about 3 hundred million tons, and the steel is widely applied to various national economic fields such as concrete buildings, energy traffic, automobile machinery, marine equipment and the like, wherein about 20 percent of the steel is industrial materials needing deep processing, and the balance of the steel is mainly concrete building steel. Industrial wire and rod material are various (such as spring steel, bridge steel, cord steel, cold heading steel, free-cutting steel, bearing steel and the like), and in order to meet different service performance requirements, hot rolled wire and rod material are often processed through a plurality of procedures (such as cold drawing, cold heading, tempering, weaving, stranding and the like), so that the requirements on the structure and the performance are strict.
With the recent progress of the aim of ' double carbon ', green ' steel products which can reduce the steel consumption and prolong the service life are favored by the industry. However, at present, the upgrading of industrial lines and bars mainly focuses on the improvement of strength grade (such as the development of cord steel from grade 70 to grade 80 and 90; and the development of bridge cable steel from 1860MPa to 1960MPa, 2000MPa and 2100 MPa), and the weather resistance which can prolong the service life is less concerned, which has two main reasons:
(1) The steel material mainly relies on the addition of weather-resistant elements (such as Cu, cr, ni, P and the like) to improve weather resistance, the weather-resistant elements can obviously increase the hardenability of the steel, so that abnormal structures such as bainite and martensite appear in the steel, and compared with the existing micro structures of industrial lines and bars which mainly comprise ferrite and pearlite, the structures such as the bainite and the martensite are not beneficial to deep processing such as drawing, cold heading and the like, so that the addition of the elements such as Cu, cr, ni, P and the like in the steel is often strictly limited to ensure the service performance of the industrial lines and the bars.
(2) Currently, in some wire and bar products having weather resistance requirements on final finished products, means such as zinc plating, copper plating and the like are often adopted to achieve high weather resistance of the finished products, such as: galvanized steel stranded wires, copper-plated steel cords and the like, which can effectively avoid the influence of weather-resistant alloy elements on the steel performance, but the coating process has large pollution and high energy consumption and processing cost.
Currently, the industrial bar wire is mainly subjected to a coating process such as zinc plating to obtain weather resistance, which mainly has two problems: one of the hot galvanizing processes has large pollution and high cost; the weather-resistant layer on the surface of the second coating product is often thin and is easy to damage in the processes of transportation, installation and use, so that the corrosion-resistant effect cannot be achieved; in addition, the weathering steel is developed more fully in plates at present, but for industrial bar and wire materials which need cold drawing and large deformation, the development of the weathering industrial bar and wire materials is slow due to the obvious difference between the processing flow and the application scene of the plates.
Therefore, how to obtain the low-cost high-toughness weather-resistant hot-rolled rod wire which can be cold-processed and is free from coating becomes a problem to be solved urgently.
Disclosure of Invention
The invention aims to provide a low-cost high-toughness weather-resistant hot-rolled rod wire which can be cold-processed and is free of coating and a rolling process thereof.
In order to achieve the purpose, the technical scheme is as follows:
a low-cost high-toughness weather-resistant hot-rolled rod wire comprises the following chemical components in percentage by mass:
c:0.15 to 0.21wt%, si:0.62 to 0.72wt%, mn:0.80 to 1.0wt%, P: 0.045-0.075 wt%, S less than 0.015wt%, cu:0.1 to 0.5wt%, cr:0.2 to 0.5wt%, cr/Cu =1 to 2, and the balance Fe and inevitable impurities.
According to the scheme, the chemical components are as follows by mass percent:
c:0.17 to 0.19wt%, si:0.65 to 0.69wt%, mn:0.90 to 1.0wt%, P: 0.055-0.065 wt%, S less than 0.015wt%, cu:0.2 to 0.4wt%, cr:0.3 to 0.5wt%, cr/Cu =1 to 2, and the balance Fe and inevitable impurities.
According to the scheme, the microalloying is carried out, and the chemical components of the microalloying are added with Ti: 0.010-0.035 wt%, V: 0.04-0.07 wt%, ti/V = 1/4-2/4.
The rolling process of the low-cost high-toughness weather-resistant hot-rolled rod wire comprises the following steps of:
rolling; low-temperature controlled rolling is adopted, and austenite is rolled without recrystallization in the whole process;
controlling cold; the wire is cooled by adopting a stelmor process; the cooling bed on the bar adopts a heat-insulating cover for slow cooling.
According to the scheme, the finish rolling temperature in the rolling process is 840 +/-10 ℃, the diameter reducing temperature is 830 +/-10 ℃, and the finish rolling temperature is 820 +/-10 ℃.
According to the scheme, in the controlled cooling process, the wire is cooled by adopting a stelmor process, the speed of a 0# roller way is 0.2-1 m/s, and the speed of the rest 8 groups of roller ways is increased by 3 percent (extremely poor) relative to the speed of the former group of roller ways; the air volume of the 13 groups of fans is 210000m 3 And h, opening the No. 1-No. 2 fan by 5-25%, opening the heat preservation cover, ensuring the temperature of the No. 2 fan to be 650 +/-20 ℃, completely closing the No. 3-No. 13 fan, closing the heat preservation cover, and ensuring the temperature of the No. 13 fan to be more than 300 ℃.
According to the scheme, in the controlled cooling process, the temperature of the cooling bed on the bar is more than 600 ℃, the bar is slowly cooled by adopting the heat-insulating cover, and the temperature of the bar out of the heat-insulating cover is more than 300 ℃.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a low-cost high-toughness weather-resistant hot-rolled rod and wire and a rolling process thereof, the product has excellent cold processing property and formability, can meet the requirements of users on coating-free and direct naked use, greatly reduces the cost of steel for the users, greatly reduces high energy consumption and high pollution generated by the original coating material for the society, and is a novel green and environment-friendly material.
Detailed Description
The following examples further illustrate the technical solutions of the present invention, but should not be construed as limiting the scope of the present invention.
In the specific embodiment of the present invention, C: carbon element is unfavorable for corrosion of steel and has influence on welding performance, cold brittleness and stamping performance; the carbon has the most obvious influence on the strength and plasticity of the wire rod, the strength of the wire rod is continuously improved and the plasticity is rapidly reduced along with the increase of the carbon content, and the carbon content also influences the drawability of a final finished product. Comprehensively considering, the carbon content of the invention is 0.15-0.21 wt%.
Si: silicon is an important strengthening element in steel, is favorable for corrosion resistance, can obviously improve the elastic limit of the steel wire after drawing, but the excessively high content of Si increases ferrite brittleness and is not favorable for cold heading processing. Comprehensively, the silicon content of the invention is 0.62-0.72 wt%.
Mn: manganese is combined with sulfur to generate MnS, so that the harm of sulfur is reduced, pearlite can be refined, and the strength of the steel wire can be improved; however, mn is easy to be segregated in steel, so that uneven structure and performance are caused, and the production cost is increased due to the excessively high Mn content; further, in weathering steels, the influence of manganese on corrosion resistance is not well recognized in academia, and most of the scholars believe that manganese improves corrosion resistance of steel to the marine atmosphere, but has little effect on corrosion resistance in the industrial atmosphere. Comprehensively considering, the manganese content of the invention is 0.80-1.0 wt%.
P: phosphorus is one of the most effective alloy elements for improving the atmospheric corrosion resistance of steel, can be uniformly dissolved in the steel, and is beneficial to forming a dense protective film on the surface of the steel so that the interior of the steel is not corroded by the atmosphere. Comprehensively, the phosphorus content of the invention is 0.045-0.075 wt%.
S: the sulfur belongs to harmful elements in the steel, the sulfur is easy to generate hot brittleness, the steel wire drawing and heat treatment processing conditions are further deteriorated, and if the mass fraction of residual sulfur in the steel is reduced to 0.01 percent, the weather resistance of the carbon steel can be greatly improved. Comprehensively, the sulfur content S of the invention is less than 0.015wt%.
Cu: copper is a common alloy additive element for producing corrosion-resistant steel materials, cu is a metal element with a low chemical reaction speed, the strength of steel can be improved by adding Cu, and if the content of Cu is too high, the low-temperature toughness of the steel can be directly influenced. It is worth noting that the effect of copper on counteracting the deleterious effects of sulfur in steel is significant, and its effect is characterized by the higher the sulfur content in steel, the more pronounced the relative effect of copper on reducing the corrosion rate. This is because copper forms refractory sulfides with sulfur. Comprehensively, the copper content of the invention is 0.1-0.5 wt%.
Cr: chromium is a main element for improving the weather resistance of steel, and can form a compact oxide film on the surface of the steel, improve the passivation capability of the steel and reduce the growth speed of a rust layer. However, chromium greatly increases the hardenability of steel, and excessive chromium causes formation of abnormal structures such as bainite and martensite in steel, which is disadvantageous to cold workability of steel. Comprehensively, the chromium content of the invention is 0.2-0.5 wt%.
Cr/Cu: and the weather-resistant elements of copper and chromium have a synergistic strengthening effect, and the Cr/Cu = 1-2 based on the most economic cost.
Ti, V: titanium and vanadium are common microalloy strengthening elements, austenite grains can be prevented from growing, reheated austenite grains are refined, uniformity of structure and performance is improved, production cost is obviously improved by adding excessive titanium and vanadium, and the Ti and V composite microalloy strengthening effect is superior to that of a single element. Comprehensively, the contents of titanium and vanadium are respectively 0.010-0.035 wt% and 0.04-0.07 wt%, and Ti/V = 1/4-2/4.
In order to improve the toughness of the material, the invention adopts low-temperature rolling in the whole process, realizes the fine grain strengthening effect by deformation induced phase change, reduces the addition of microalloy, ensures good toughness matching and further reduces the production cost.
The chemical compositions of the examples of the present invention and the comparative examples are shown in table 1; the process parameters of the rolling process of each example and comparative example are shown in Table 2; the cooling control process parameters for each example and comparative example are shown in table 3. The test effects (toughness, cold heading property, weather resistance) of each example and comparative example are shown in Table 4.
TABLE 1 chemical composition
TABLE 2 Rolling Process parameters
TABLE 3 controlled Cooling Process parameters
TABLE 4 test results
As can be seen from Table 4, the cold heading cracking of the comparative example shows that the steel toughness is insufficient and the relative corrosion rate is more than or equal to 65 percent, and the coating-free weather resistance requirement of downstream users cannot be met; the steel has the advantages that the steel has good strength and toughness matching, and the relative corrosion rate is less than or equal to 25 percent. In conclusion, the low-cost high-toughness weather-resistant hot-rolled rod and wire rod and the rolling process thereof developed by the invention have the advantages that the product has excellent cold processing property and formability, can meet the requirements of users on coating-free and direct naked use, greatly reduces the steel cost for the users, greatly reduces high energy consumption and high pollution generated by the original coating material for the society, and is a novel green and environment-friendly material.
Claims (7)
1. A low-cost high-toughness weather-resistant hot-rolled rod wire is characterized by comprising the following chemical components in percentage by mass:
c:0.15 to 0.21wt%, si:0.62 to 0.72wt%, mn:0.80 to 1.0wt%, P: 0.045-0.075 wt%, S less than 0.015wt%, cu:0.1 to 0.5wt%, cr:0.2 to 0.5wt%, cr/Cu =1 to 2, and the balance Fe and inevitable impurities.
2. The low-cost high-toughness weather-resistant hot-rolled rod wire rod as claimed in claim 1, wherein the chemical components are as follows by mass percent:
c:0.17 to 0.19wt%, si:0.65 to 0.69wt%, mn:0.90 to 1.0wt%, P: 0.055-0.065 wt%, S less than 0.015wt%, cu:0.2 to 0.4wt%, cr:0.3 to 0.5wt%, cr/Cu =1 to 2, and the balance Fe and unavoidable impurities.
3. The low-cost, high-toughness, weather-resistant, hot-rolled rod and wire as claimed in claim 1, wherein the microalloying is carried out by further adding Ti: 0.010-0.035 wt%, V: 0.04-0.07 wt%, ti/V = 1/4-2/4.
4. The process for rolling the low-cost high-toughness weather-resistant hot-rolled rod wire according to claim 1, which comprises the steps of:
rolling; low-temperature controlled rolling is adopted, and austenite is rolled without recrystallization in the whole process;
controlling cold; the wire is cooled by adopting a stelmor process; the cooling bed on the bar adopts a heat-insulating cover for slow cooling.
5. The process for rolling a low-cost, high-toughness, weather-resistant, hot-rolled rod or wire according to claim 4, wherein the finish rolling temperature in the rolling process is 840 ± 10 ℃, the reduction diameter temperature is 830 ± 10 ℃, and the finish rolling temperature is 820 ± 10 ℃.
6. The process for rolling the low-cost, high-toughness, weather-resistant, hot-rolled rod and wire rod according to claim 4, wherein in the controlled cooling process, the wire rod is cooled by a stelmor process, the speed of a 0# roller table is 0.2-1 m/s, and the speeds of the rest 8 groups of roller tables are increased by 3 percent (extremely poor) relative to the speed of the former group of roller tables; the air volume of the 13 groups of fans is 210000m 3 /h，15% -25% of # 2 fan is opened, the heat preservation cover is opened, the temperature of the # 2 fan is ensured to be 650 plus or minus 20 ℃, the # 3-13 fan is completely closed, the heat preservation cover is closed, and the temperature of the # 13 fan is ensured to be more than 300 ℃.
7. A process for rolling a low-cost, high-toughness, weather-resistant, hot-rolled bar and wire rod according to claim 4, wherein in the controlled cooling process, the temperature of the cooling bed on the bar is more than 600 ℃, the temperature of the cooling bed on the bar is slowly cooled by a heat-preserving cover, and the temperature of the cooling bed on the bar is more than 300 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211658213.4A CN115896635B (en) | 2022-12-22 | 2022-12-22 | Low-cost high-toughness weather-resistant hot rolled rod and wire and rolling process thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211658213.4A CN115896635B (en) | 2022-12-22 | 2022-12-22 | Low-cost high-toughness weather-resistant hot rolled rod and wire and rolling process thereof |
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| CN115896635A true CN115896635A (en) | 2023-04-04 |
| CN115896635B CN115896635B (en) | 2024-05-03 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05171265A (en) * | 1991-12-20 | 1993-07-09 | Sumitomo Metal Ind Ltd | Production of steel material with high atmosphere corrosion resistance for steel frame structure excellent in high temperature strength characteristic |
| KR19990039204A (en) * | 1997-11-11 | 1999-06-05 | 이구택 | Manufacturing method of weathering steel of tensile strength 58kg f / ㎠ |
| JP2001303128A (en) * | 2000-04-26 | 2001-10-31 | Nkk Corp | Method for producing rolled weather resistant shape steel |
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- 2022-12-22 CN CN202211658213.4A patent/CN115896635B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05171265A (en) * | 1991-12-20 | 1993-07-09 | Sumitomo Metal Ind Ltd | Production of steel material with high atmosphere corrosion resistance for steel frame structure excellent in high temperature strength characteristic |
| KR19990039204A (en) * | 1997-11-11 | 1999-06-05 | 이구택 | Manufacturing method of weathering steel of tensile strength 58kg f / ㎠ |
| JP2001303128A (en) * | 2000-04-26 | 2001-10-31 | Nkk Corp | Method for producing rolled weather resistant shape steel |
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