CN115896635B - Low-cost high-toughness weather-resistant hot rolled rod and wire and rolling process thereof - Google Patents
Low-cost high-toughness weather-resistant hot rolled rod and wire and rolling process thereof Download PDFInfo
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- CN115896635B CN115896635B CN202211658213.4A CN202211658213A CN115896635B CN 115896635 B CN115896635 B CN 115896635B CN 202211658213 A CN202211658213 A CN 202211658213A CN 115896635 B CN115896635 B CN 115896635B
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- 238000005096 rolling process Methods 0.000 title claims abstract description 24
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 15
- 229910052802 copper Inorganic materials 0.000 claims abstract description 14
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 13
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 10
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 9
- 239000000126 substance Substances 0.000 claims abstract description 8
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 7
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 7
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 14
- 238000004321 preservation Methods 0.000 claims description 7
- 229910001566 austenite Inorganic materials 0.000 claims description 4
- 238000004886 process control Methods 0.000 claims description 3
- 238000004513 sizing Methods 0.000 claims description 2
- 238000010583 slow cooling Methods 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 45
- 239000010959 steel Substances 0.000 abstract description 45
- 239000011248 coating agent Substances 0.000 abstract description 9
- 238000000576 coating method Methods 0.000 abstract description 9
- 239000000463 material Substances 0.000 abstract description 9
- 238000007747 plating Methods 0.000 abstract description 5
- 238000005275 alloying Methods 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 229910052742 iron Inorganic materials 0.000 abstract 1
- 239000010949 copper Substances 0.000 description 18
- 239000011651 chromium Substances 0.000 description 12
- 230000007797 corrosion Effects 0.000 description 10
- 238000005260 corrosion Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 8
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 8
- 239000011572 manganese Substances 0.000 description 8
- 239000011593 sulfur Substances 0.000 description 8
- 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
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 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
- 229910000870 Weathering steel Inorganic materials 0.000 description 4
- 238000005098 hot rolling Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- 229910001563 bainite Inorganic materials 0.000 description 3
- 229910000734 martensite Inorganic materials 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000009286 beneficial 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
- 239000010703 silicon Substances 0.000 description 2
- 238000005482 strain hardening Methods 0.000 description 2
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 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
- 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
- 230000001627 detrimental 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
- 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
- 239000003973 paint Substances 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
- 230000009466 transformation Effects 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
Abstract
The invention discloses a low-cost high-toughness weather-proof hot rolled rod wire, which comprises the following ：C：0.15～0.21wt％、Si：0.62～0.72wt％、Mn：0.80～1.0wt％、P：0.045～0.075wt％、S＜0.015wt％、Cu：0.1～0.5wt％、Cr：0.2～0.5wt％、Cr/Cu＝1～2, mass percent of Fe and unavoidable impurities as the rest; the micro-alloying can be performed according to the requirements, and the chemical components of the micro-alloying are added with Ti in percentage by mass: 0.010 to 0.035wt%, V:0.04 to 0.07wt% Ti/v=1/4 to 2/4; the invention provides a low-cost high-toughness weather-proof hot rolled rod wire and a rolling process thereof, and the product has excellent cold workability and formability, can meet the requirements of no coating and direct bare use of users, greatly reduces the steel cost for users, greatly reduces the high energy consumption and high pollution generated by the original coating and plating material for society, and is a novel 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 and wire and a rolling process thereof.
Background
The production of hot rolling lines and bars in China in 2021 is about 3 hundred million tons, and the hot rolling lines and bars are widely applied to various national economic fields such as concrete buildings, energy traffic, automobile machinery, marine equipment and the like, wherein about 20% of the hot rolling lines and bars are industrial materials needing deep processing, and the rest of the hot rolling lines and bars are mainly steel for concrete buildings. Industrial wires and bars are numerous (such as spring steel, bridge cable steel, cord steel, cold heading steel, free cutting steel, bearing steel and the like), and in order to meet the requirements of different service performances, hot rolled wires and bars often need to be processed by a plurality of working procedures (such as cold drawing, cold heading, tempering, weaving, stranding and the like), so that the requirements on tissues and performances are strict.
With the recent advancement of the "two carbon" goal, the "green" steel products that can reduce the amount of steel used and extend the service life are favored by the industry. However, at present, the upgrading and upgrading of industrial wires and bars mainly focuses on the improvement of the intensity level (for example, the development of cord steel from 70 level to 80 level and 90 level and the evolution of bridge cable steel from 1860MPa to 1960MPa, 2000MPa and 2100 MPa), and the attention to the weather resistance capable of prolonging the service life is less, which mainly has two reasons:
(1) The steel mainly depends on the addition of weather-resistant elements (such as Cu, cr, ni, P and the like) to improve the weather resistance, and the weather-resistant elements can obviously increase the hardenability of the steel, so that abnormal structures such as bainite, martensite and the like appear in the steel, and compared with the existing industrial wire and bar microstructures mainly comprising ferrite and pearlite, the structures such as bainite, martensite and the like are not beneficial to deep processing such as drawing, cold heading and the like, so that the addition of elements such as Cu, cr, ni, P and the like is often strictly limited in the steel in order to ensure the service performance of the industrial wire and bar.
(2) Currently, in some wire and bar products with weather resistance requirements on final products, means such as galvanization, copper plating and the like are often adopted to realize high weather resistance of the final 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 steel performance, but the plating process has large pollution and high energy consumption and processing cost.
Currently, industrial rod and wire materials mainly obtain weather resistance through a galvanization process such as galvanization, which has two main problems: the hot galvanizing process has large pollution and high cost; the weather-resistant layer on the surface of the second coating product is often thinner, and is easy to damage in the process of transportation, installation and use, so that the corrosion-resistant effect cannot be achieved; in addition, the current weathering steel is fully developed in the plates, but for industrial rod wires which need cold drawing and large deformation, the weathering steel is slow to develop due to the obvious difference between the processing flow and the application scene of the weathering steel and the plates.
Based on the above, how to obtain a low-cost high-toughness weather-resistant hot rolled rod wire rod which can be cold-processed and is free from coating becomes a problem to be solved.
Disclosure of Invention
The invention aims to provide a low-cost high-toughness weather-resistant hot rolled rod and wire rod which can be cold-processed and is free from coating and a rolling process thereof.
In order to achieve the above purpose, the following technical scheme is adopted:
the low-cost high-toughness weather-proof hot rolled rod wire comprises the following chemical components in percentage by mass:
C：0.15～0.21wt％、Si：0.62～0.72wt％、Mn：0.80～1.0wt％、P：0.045～0.075wt％、S＜0.015wt％、Cu：0.1～0.5wt％、Cr：0.2～0.5wt％、Cr/Cu＝1～2, The balance of Fe and unavoidable impurities.
According to the scheme, the chemical components of the paint are as follows in percentage by mass:
C：0.17～0.19wt％、Si：0.65～0.69wt％、Mn：0.90～1.0wt％、P：0.055～0.065wt％、S＜0.015wt％、Cu：0.2～0.4wt％、Cr：0.3～0.5wt％、Cr/Cu＝1～2, The balance of Fe and unavoidable impurities.
According to the scheme, the microalloying is carried out, and the chemical components of the microalloying are added with Ti in percentage by mass: 0.010 to 0.035wt%, V:0.04 to 0.07wt% Ti/v=1/4 to 2/4.
The rolling process of the low-cost high-toughness weather-resistant hot rolled rod and wire comprises the following steps of:
Rolling; adopting low-temperature controlled rolling, wherein the whole process adopts austenite unrecrystallized rolling;
cooling control is performed; cooling the wire rod by adopting a Steyr process control; the cooling bed on the bar is slowly cooled by a heat-preserving cover.
According to the scheme, the finish rolling temperature in the rolling process is 840+/-10 ℃, the reduced sizing 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 Steyr 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 improved by 3% relative to that of the former group of roller ways (extremely bad); the air quantity of the 13 groups of fans is 210000m 3/h, the 1# fan to the 2# fan is opened by 5% -25%, the heat preservation cover is opened, the temperature of the outlet 2# fan is 650+/-20 ℃, the 3# fan to the 13# fan is fully closed, and the heat preservation cover is closed, so that the temperature of the outlet 13# fan is more than 300 ℃.
According to the scheme, in the controlled cooling process, the temperature of a cooling bed on the bar is more than 600 ℃, a heat preservation cover is adopted for slow cooling, and the temperature of a heat preservation 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-proof hot rolled rod wire and a rolling process thereof, and the product has excellent cold workability and formability, can meet the requirements of no coating and direct bare use of users, greatly reduces the steel cost for users, greatly reduces the high energy consumption and high pollution generated by the original coating and plating material for society, and is a novel environment-friendly material.
Detailed Description
The following examples further illustrate the technical aspects of the present invention, but are not intended to limit the scope of the present invention.
In a specific embodiment of the present invention, C: carbon element is detrimental to corrosion of steel and has an effect on welding performance, cold embrittlement performance and stamping performance; the carbon has the most remarkable influence on the strength and the plasticity of the wire rod, and as the carbon content increases, the strength of the wire rod is continuously improved, the plasticity is rapidly reduced, and the carbon content also influences the drawability of a final finished product. Comprehensively considering the carbon content of the invention to be 0.15 to 0.21 weight percent.
Si: the silicon element 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 Si content increases the brittleness of ferrite and is unfavorable for cold heading. Comprehensively considering the silicon content of the invention to be 0.62 to 0.72 weight percent.
Mn: manganese and sulfur are combined to generate MnS so as to reduce the harm of sulfur, refine pearlite and improve the strength of the steel wire; however, mn tends to be biased in steel, which causes uneven structure and performance, and too high Mn content will increase production cost; in addition, in the case of weathering steel, the influence of manganese on corrosion resistance in academia is not uniform, and most students believe that manganese can improve corrosion resistance of steel to the ocean atmosphere, but has little effect on corrosion resistance in the industrial atmosphere. Comprehensively considering the manganese content of the invention to be 0.80 to 1.0 weight percent.
P: phosphorus is one of the most effective alloying elements for improving the atmospheric corrosion resistance of steel, can be uniformly dissolved in the steel, is favorable for forming a compact protective film on the surface of the steel and preventing the inside of the steel from being corroded by the atmosphere, but for industrial wires needing deep cold working, the phosphorus is easy to generate cold shortness, has great influence on the quality of the steel, especially the cold working performance, and needs to be strictly controlled. In general, the phosphorus content of the invention is 0.045 to 0.075 wt.%.
S: sulfur belongs to harmful elements in the steel, and is easy to generate thermal embrittlement, so that 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%, the weather resistance of the carbon steel can be greatly improved. In combination, the sulfur content S of the invention is less than 0.015 wt.%.
Cu: copper is an alloying addition element commonly used for producing corrosion-resistant steel materials, cu is a metal element with slower chemical reaction speed, and the strength of the steel can be improved by adding Cu, but if the Cu content is too high, the low-temperature toughness of the steel can be directly affected. Notably, the effect of copper on counteracting the deleterious effects of sulfur in steel is evident, and the effect is characterized by the higher sulfur content in steel and the more pronounced the relative effect of copper on reducing corrosion rate. This is because copper forms poorly soluble sulfides with sulfur. Comprehensively considering that the copper content of the invention is 0.1 to 0.5 weight percent.
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, so that the passivation capability of the steel is improved, and the growth speed of a rust layer is reduced. However, chromium can greatly improve the hardenability of the steel, and excessive chromium can cause abnormal structures such as bainite, martensite and the like to be formed in the steel, which is disadvantageous to the cold workability of the steel. Comprehensively considering that the chromium content of the invention is 0.2 to 0.5 weight percent.
Cr/Cu: the invention has synergistic strengthening effect on the weather-resistant elements copper and chromium, and Cr/Cu=1-2 based on the most economic cost consideration.
Ti, V: titanium and vanadium are common microalloy strengthening elements, can prevent austenite grains from growing, refine and reheat the austenite grains, improve uniformity of structure and performance, but excessive addition can obviously improve production cost, and the Ti and V composite microalloy strengthening effect is superior to that of single element. Comprehensively considering that the titanium and vanadium contents of the invention are respectively 0.010 to 0.035wt percent and 0.04 to 0.07wt percent, and Ti/V=1/4 to 2/4.
In order to improve the toughness of the material, the invention adopts low-temperature rolling in the whole process, realizes fine grain strengthening effect by deformation-induced phase transformation, reduces the addition amount of micro alloy, ensures good toughness matching and further reduces the production cost.
The chemical compositions of the examples and comparative examples of the present invention are shown in Table 1; the rolling process parameters of each example and comparative example are shown in Table 2; the process parameters for the cooling control of each example and comparative example are shown in Table 3. The test results (toughness, cold heading property, weather resistance) of each example and comparative example are shown in Table 4.
TABLE 1 chemical compositions
Table 2 parameters of the rolling process
TABLE 3 controlled cooling process parameters
TABLE 4 test effect
As can be seen from Table 4, the comparative examples show cold heading cracking, which indicates that the steel toughness is insufficient and the relative corrosion rate is more than or equal to 65%, and the weather resistance requirement of the downstream user for coating-free cannot be met; the strength of the steel is more than or equal to 725MPa, the surface shrinkage is more than or equal to 60%, and the cold heading is not cracked, so that the steel has good toughness matching, and the relative corrosion rate is less than or equal to 25%. In summary, the low-cost high-toughness weather-resistant hot rolled rod and wire rod and the rolling process thereof developed by the invention have excellent cold workability and formability, can meet the requirements of no coating and direct bare use of users, greatly reduce the cost of steel for users, greatly reduce the high energy consumption and high pollution of the original coating and plating material for society, and are novel environment-friendly materials.
Claims (2)
1. The low-cost high-toughness weather-resistant hot rolled rod wire is characterized by comprising the following chemical components in percentage by mass:
C：0.15～0.21wt%、Si：0.62～0.72wt%、Mn：0.80～1.0wt%、P：0.045～0.075wt%、S＜0.015wt%、Cu：0.1～0.5wt%、Cr：0.2～0.5wt%、Cr/Cu=1～2、Ti：0.010～0.035wt%、V：0.04～0.07wt%、Ti/V=1/4～2/4, The balance of Fe and unavoidable impurities;
The rolling process of the low-cost high-toughness weather-resistant hot rolled rod and wire comprises the following steps of:
Rolling; adopting low-temperature controlled rolling, wherein the whole process adopts austenite unrecrystallized rolling; the finish rolling temperature in the rolling process is 840+/-10 ℃, the reduced sizing temperature is 830+/-10 ℃, and the final rolling temperature is 820+/-10 ℃;
Cooling control is performed; cooling the wire rod by adopting a Steyr process control; the bar is slowly cooled by a heat-preserving cover on the cooling bed; in the controlled cooling process, the wire is cooled by adopting a Steyr process control, 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 improved by 3% relative to the speed of the former group of roller ways; the air quantity of the 13 groups of fans is 210000m 3/h, the 1# fan to the 2# fan is opened by 5% -25%, the heat preservation cover is opened, the temperature of the outlet 2# fan is 650+/-20 ℃, the 3# fan to the 13# fan is fully closed, and the temperature of the outlet 13# fan is higher than 300 ℃; in the controlled cooling process, the temperature of a cooling bed on the bar is more than 600 ℃, a heat preservation cover is adopted for slow cooling, and the temperature of a heat preservation cover is more than 300 ℃.
2. The low-cost high-toughness weather-resistant hot rolled rod and wire rod according to claim 1, wherein the chemical components in percentage by mass are as follows:
C：0.17～0.19wt%、Si：0.65～0.69wt%、Mn：0.90～1.0wt%、P：0.055～0.065wt%、S＜0.015wt%、Cu：0.2～0.4wt%、Cr：0.3～0.5wt%、Cr/Cu=1～2.
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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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| Publication Number | Publication Date |
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| CN115896635A CN115896635A (en) | 2023-04-04 |
| CN115896635B true 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
- 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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