CN116024493A - Hot rolled steel strip for high-strength corrosion-resistant hollow anchor rod welded pipe and preparation method - Google Patents
Hot rolled steel strip for high-strength corrosion-resistant hollow anchor rod welded pipe and preparation method Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 55
- 239000010959 steel Substances 0.000 title claims abstract description 55
- 230000007797 corrosion Effects 0.000 title claims abstract description 29
- 238000005260 corrosion Methods 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 14
- 239000012535 impurity Substances 0.000 claims abstract description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 22
- 238000009749 continuous casting Methods 0.000 claims description 16
- 238000001816 cooling Methods 0.000 claims description 14
- 238000005098 hot rolling Methods 0.000 claims description 10
- 238000007670 refining Methods 0.000 claims description 9
- 229910052742 iron Inorganic materials 0.000 claims description 7
- 238000010079 rubber tapping Methods 0.000 claims description 6
- 238000006477 desulfuration reaction Methods 0.000 claims description 5
- 230000023556 desulfurization Effects 0.000 claims description 5
- 238000004804 winding Methods 0.000 claims description 4
- 229910000859 α-Fe Inorganic materials 0.000 claims description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 3
- 229910001563 bainite Inorganic materials 0.000 claims description 3
- 239000011575 calcium Substances 0.000 claims description 3
- 229910052791 calcium Inorganic materials 0.000 claims description 3
- 229910001562 pearlite Inorganic materials 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 13
- 238000003466 welding Methods 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 6
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- 229910052799 carbon Inorganic materials 0.000 abstract description 5
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- 230000008569 process Effects 0.000 abstract description 4
- 229910052710 silicon Inorganic materials 0.000 abstract description 4
- 238000005728 strengthening Methods 0.000 abstract description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052787 antimony Inorganic materials 0.000 abstract description 3
- 229910052748 manganese Inorganic materials 0.000 abstract description 3
- 239000002244 precipitate Substances 0.000 abstract description 3
- 239000013078 crystal Substances 0.000 abstract description 2
- 239000010936 titanium Substances 0.000 description 10
- 239000010949 copper Substances 0.000 description 9
- 239000010955 niobium Substances 0.000 description 9
- 239000011651 chromium Substances 0.000 description 8
- 239000011572 manganese Substances 0.000 description 8
- 239000000047 product Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 6
- 229910052698 phosphorus Inorganic materials 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 5
- 238000002791 soaking Methods 0.000 description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 4
- 239000011574 phosphorus Substances 0.000 description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
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- 229910052758 niobium Inorganic materials 0.000 description 2
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
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- 239000011593 sulfur Substances 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- FAWGZAFXDJGWBB-UHFFFAOYSA-N antimony(3+) Chemical compound [Sb+3] FAWGZAFXDJGWBB-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000011835 investigation Methods 0.000 description 1
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- 229910052751 metal Inorganic materials 0.000 description 1
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- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention discloses a hot-rolled steel strip for a high-strength corrosion-resistant hollow anchor rod welded pipe and a preparation method thereof, wherein the hot-rolled steel strip comprises the following elements in percentage by weight: 0.18-0.23% of C, 0.15-0.30% of Si, 0.90-1.10% of Mn, less than or equal to 0.020% of P, less than or equal to 0.007% of S, 0.02-0.04% of Nb, 0.70-0.90% of Cr, 0.20-0.50% of Cu, 0.01-0.03% of Ti, 0.04-0.08% of Sb, and the balance of Fe and unavoidable impurities. According to the invention, by adding higher C element, the content of Si and Mn elements is controlled, the strength of the material is ensured, the carbon equivalent is reduced, a certain amount of Ti element is added, precipitates are formed in the welding process, the coarsening of a heat affected zone structure is restrained, the welding performance is improved, the content of Nb element is controlled to exert fine crystal strengthening effect, the strength is further ensured, the content of Cu, cr and Sb elements is controlled, and the corrosion resistance of the material in a roadway and rock-soil humid environment is improved under the condition that the corrosion resistance and the toughness of the anchor rod steel are matched.
Description
Technical Field
The invention relates to the technical field of hot continuous rolling plate strips, in particular to a high-strength corrosion-resistant hollow anchor rod welded pipe, a hot rolled steel strip and a preparation method.
Background
The anchor rod is a common variety of coal mine and engineering enterprises, and is mainly applied to deep roadway support of coal, iron ore and the like and large-scale geotechnical engineering reinforcement of high-speed railway highways, dams and the like. With the development of technical popularization, the application of the method is wider and the demand is increased. The principle of action of the anchor rod is that the longitudinal tension of the anchor rod body is used to overcome the defect that the tensile capacity of the rock-soil body is far lower than the compressive capacity, so that the rock-soil body is limited from being separated from the original body on the surface, the cohesiveness of the rock-soil body is increased on the macroscopic view, and the anchor rod is a rod system structure for reinforcing the rock-soil body.
The anchor rod steel product of the prior art has single brand and almost all of the anchor rod steel products are MG335. After intensive investigation by technicians, it was found that the strength of the anchor rod steel product of the current MG335 could not meet the requirements. Scientific researchers propose to use high-strength anchor rod steel products to replace MG335 grade products, and then MG500, SMG600MPa and other grade products appear, but almost all the products are produced by rod and wire rolling or seamless steel tube drawing, and the cost is high, the yield is low, the precision is controlled, the surface quality is poor, and the product has no corrosion resistance. In the use process, the exposed surface of the anchor rod steel is gradually rusted due to long-term contact with moist air, so that the strength of the material is reduced, and the service time is shortened.
Therefore, developing a high-strength corrosion-resistant anchor rod steel is a technical problem to be solved urgently by those skilled in the art.
Based on this, the prior art still remains to be improved.
Disclosure of Invention
The invention mainly aims to provide a hot rolled steel strip for a high-strength corrosion-resistant hollow anchor rod welded pipe and a preparation method thereof, which are used for solving the technical problems existing in the prior art for producing an anchor rod by rolling a rod wire or drawing a seamless steel pipe.
According to some embodiments of the present invention, on the one hand, a hot rolled steel strip for high-strength corrosion-resistant hollow anchor rod welded pipe is provided, which comprises the following elements in percentage by weight: 0.18-0.23% of C, 0.15-0.30% of Si, 0.90-1.10% of Mn, less than or equal to 0.020% of P, less than or equal to 0.007% of S, 0.02-0.04% of Nb, 0.70-0.90% of Cr, 0.20-0.50% of Cu, 0.01-0.03% of Ti, 0.04-0.08% of Sb, and the balance of Fe and unavoidable impurities.
Further, the metallographic structure is ferrite, pearlite and granular bainite, and the average grain size is 11-13 grades.
Further, the yield strength Rel is more than or equal to 600MPa, the tensile strength Rm is more than or equal to 700MPa, and the elongation is more than or equal to 20%.
On the other hand, the embodiment of the invention also discloses a preparation method of the hot rolled steel strip, which sequentially comprises the following steps: molten iron desulfurization, converter, LF refining, CC (continuous casting), hot rolling, laminar cooling and coiling.
Further, smelting and continuously casting the components into a plate blank, wherein S is less than or equal to 0.008 percent when the plate blank is put into a converter, the tapping temperature of the converter is 1640-1660 ℃, calcium treatment is adopted after LF refining, the outlet temperature of LF is 1580+/-5 ℃, and continuous casting is carried out at a constant speed.
Further, in the hot rolling process, the soaking temperature of the billet is 1210-1250 ℃, and the final rolling temperature is 840-880 ℃.
Further, in the winding step, the winding temperature is 560 ℃ to 620 ℃.
Further, in the laminar cooling step, a front stage cooling method is adopted.
By adopting the technical scheme, the invention has at least the following beneficial effects:
according to the high-strength corrosion-resistant hollow anchor rod welded pipe, the hot rolled steel strip and the preparation method, the higher C element is added, the content of Si and Mn elements is controlled, the strength of the material is ensured, the carbon equivalent is reduced, a certain amount of Ti elements are added, precipitates are formed in the welding process, the coarsening of a heat affected zone structure is restrained, the welding performance is improved, the Nb element content is controlled to exert fine crystal strengthening effect, the strength is further ensured, and the corrosion resistance of the material in a roadway and rock-soil humid environment is improved under the condition that the Cu, cr and Sb element content is controlled to ensure that the corrosion resistance and the toughness of the anchor rod steel are matched.
The invention is matched with corresponding steelmaking, continuous casting and hot rolling production processes, and ensures that the material structure is tiny and uniform, thereby obtaining the hot rolled steel strip for the high-strength corrosion-resistant hollow anchor rod welded pipe, the yield strength Rel is more than or equal to 600MPa, the tensile strength Rm is more than or equal to 700MPa, and the elongation is more than or equal to 20%.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart illustrating a method for producing hot rolled steel strip for high strength corrosion resistant hollow bolt welded pipe in accordance with some embodiments of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments of the present invention will be described in further detail with reference to the accompanying drawings.
It should be noted that, in the embodiments of the present invention, all the expressions "first" and "second" are used to distinguish two entities with the same name but different entities or different parameters, and it is noted that the "first" and "second" are only used for convenience of expression, and should not be construed as limiting the embodiments of the present invention, and the following embodiments are not described one by one.
Some embodiments of the invention disclose a hot rolled steel strip for a high-strength corrosion-resistant hollow anchor rod welding pipe and a preparation method thereof, which increase the variety of the high-performance hot rolled steel strip for the hollow anchor rod welding pipe, solve the problem of insufficient development of the corrosion-resistant anchor rod steel variety proposed in the background art, and provide a new anchor rod steel material selection. The hot rolled steel strip for the high-strength corrosion-resistant hollow anchor rod welded pipe comprises the following elements in percentage by weight: 0.18-0.23% of C, 0.15-0.30% of Si, 0.90-1.10% of Mn, less than or equal to 0.020% of P, less than or equal to 0.007% of S, 0.02-0.04% of Nb, 0.70-0.90% of Cr, 0.20-0.50% of Cu, 0.01-0.03% of Ti, 0.04-0.08% of Sb, and the balance of Fe and unavoidable impurities. The metallographic structure is ferrite, pearlite and granular bainite, the average grain size is 11-13, the yield strength Rel is more than or equal to 600MPa, the tensile strength Rm is more than or equal to 700MPa, and the elongation is more than or equal to 20%.
As shown in fig. 1, the method for preparing the hot rolled steel strip comprises the following steps: desulphurizing molten iron, converter, LF refining, CC (continuous casting), hot rolling, laminar cooling and coiling. Smelting and continuously casting the components into a plate blank, feeding the plate blank into a furnace S which is less than or equal to 0.008 percent, tapping the steel from the converter at 1640-1660 ℃, adopting calcium treatment after LF refining, and adopting constant-speed casting for continuous casting at the LF outlet temperature of 1580+/-5 ℃. In the hot rolling process, the soaking temperature of the billet is 1210-1250 ℃, the finish rolling temperature is 840-880 ℃, the coiling temperature is 560-620 ℃, and a front-stage cooling mode is adopted.
The high-strength corrosion-resistant hot rolled steel strip for the hollow anchor rod welded pipe disclosed by the embodiments of the invention comprises the following elements in percentage by weight: 0.18-0.23% of C, 0.15-0.30% of Si, 0.90-1.10% of Mn, less than or equal to 0.020% of P, less than or equal to 0.007% of S, 0.02-0.04% of Nb, 0.70-0.90% of Cr, 0.20-0.50% of Cu, 0.01-0.03% of Ti, 0.04-0.08% of Sb, and the balance of Fe and unavoidable impurities.
Wherein, the carbon directly affects the strength, plasticity, toughness, welding performance and the like of steel, 0.1 percent of C is increased, the yield strength is increased by 28MPa, the tensile strength is increased by 70MPa, but the high content of C can greatly reduce the plasticity, toughness and welding performance of the material, and the content of C is controlled to be 0.18 to 0.23 percent.
Silicon can improve the strength of steel, but the effect is inferior to that of phosphorus, but silicon is easy to form a banded structure in the steel, and has strong affinity with oxygen, low-melting silicate is easy to generate during welding, and the welding performance of the steel is reduced, and the Si content is controlled to be 0.15-0.30%.
Manganese and iron form solid solution, can improve the hardness and strength of ferrite and austenite in steel, and are good deoxidizing agent and desulfurizing agent, and the content of Mn in the invention is controlled to be 0.90-1.10%.
Phosphorus and sulfur are used as harmful elements, the texture performance of the steel plate is adversely affected, the lower the content of the phosphorus and sulfur is, the better the content of the phosphorus is, the high content of the P can obviously reduce the plasticity and the low-temperature toughness of the steel, and S can form sulfide inclusions to deteriorate the performance of the steel. The P is less than or equal to 0.020 percent, and the S is less than or equal to 0.007 percent.
Niobium is carbide forming element, nbC can pin austenite grain boundary to prevent grain growth, and NbC can form second phase strengthening, which is favorable for improving strength, plasticity and toughness of steel, but the content of niobium is too high to increase production cost and reduce strengthening effect, and the content of Nb is controlled to be 0.02-0.04%.
Titanium is a strong carbide and nitride forming element, and precipitates formed by the titanium and C, N can effectively refine austenite grains and inhibit coarsening of a coarse grain area in the welding process, but coarse carbonitride is easily formed due to the fact that the titanium content is too high, so that the impact, fatigue and forming performance of the material are reduced, and the Ti content is controlled to be 0.01-0.03%.
Chromium has obvious effect on improving the corrosion resistance of steel, the content is generally more than 0.2%, meanwhile, the chromium can improve the strength of the steel, increase the hardenability of the steel and have the effect of secondary hardening, but the excessive content can reduce the toughness of the steel, and simultaneously reduce the welding performance, and the Cr content is controlled to be 0.70-0.90%; copper can improve the corrosion resistance of steel, is favorable for forming a compact amorphous oxide protective layer with good adhesiveness on the surface of steel, but excessive copper is easy to gather at a grain boundary, so that a plate blank is cracked and brittle broken, and the Cu content is controlled to be 0.20-0.50%; the antimony can improve the corrosion resistance of the material in a humid and easily-corroded environment, so that the metal surface forms Sb in a corrosive medium 2 O 5 The Sb content is controlled to be 0.04-0.08% while the antimony element is too high to reduce the strength and the plasticity of the steel and increase the cost.
Example 1
The high-strength corrosion-resistant hollow anchor rod welded pipe comprises the following components, by weight, 0.20% of C, 0.25% of Si, 1.03% of Mn, less than or equal to 0.020% of P, less than or equal to 0.007% of S, 0.025% of Nb, 0.88% of Cr, 0.30% of Cu, 0.027% of Ti, 0.007% of Sb, and the balance of Fe and unavoidable impurities.
The production method of the hot rolled steel strip for the high-strength corrosion-resistant hollow anchor rod welded pipe comprises the following key process steps of molten iron desulfurization, converter, LF refining, CC, hot rolling, laminar cooling and coiling: the converter is charged into the furnace, the S is less than or equal to 0.008 percent, the tapping temperature of the converter is 1650 percent, the LF outlet temperature is 1580 percent, the continuous casting is carried out at a constant speed, the target pulling speed is 0.9m/min, the soaking temperature of a billet is 1225 percent, the finishing temperature is 860 percent, the coiling temperature is 580 percent, the front-stage cooling mode is adopted, the average grain size of the material is 12.0 percent, the yield strength Rel 611MPa, the tensile strength Rm 722MPa and the elongation rate is 23.0 percent.
Example 2
The high-strength corrosion-resistant hollow anchor rod welded pipe comprises the following components, by weight, 0.20% of C, 0.24% of Si, 0.98% of Mn, less than or equal to 0.020% of P, less than or equal to 0.007% of S, 0.035% of Nb, 0.81% of Cr, 0.35% of Cu, 0.025% of Ti, 0.006% of Sb, and the balance of Fe and unavoidable impurities.
The production method of the hot rolled steel strip for the high-strength corrosion-resistant hollow anchor rod welded pipe comprises the following key process steps of molten iron desulfurization, converter, LF refining, CC, hot rolling, laminar cooling and coiling: the converter is charged into the furnace, the S is less than or equal to 0.008 percent, the tapping temperature of the converter is 1645 percent, the LF outlet temperature is 1580 percent, the continuous casting is carried out at a constant speed, the target pulling speed is 1.0m/min, the soaking temperature of a billet is 1220 percent, the finishing temperature is 850 percent, the coiling temperature is 590 percent, the front-stage cooling mode is adopted, the average grain size of the material is 12.5 percent, the yield strength is Rel 620MPa, the tensile strength is Rm 712MPa, and the elongation is 22.5 percent.
Example 3
The high-strength corrosion-resistant hollow anchor rod welded pipe comprises the following components, by weight, C0.23%, si 0.17%, mn 0.96%, P less than or equal to 0.020%, S less than or equal to 0.007%, nb 0.025%, cr 0.80%, cu 0.35%, ti 0.022%, sb 0.007%, and the balance of Fe and unavoidable impurities.
The production method of the hot rolled steel strip for the high-strength corrosion-resistant hollow anchor rod welded pipe comprises the following key process steps of molten iron desulfurization, converter, LF refining, CC, hot rolling, laminar cooling and coiling: the converter is charged into the furnace, the S is less than or equal to 0.008%, the tapping temperature of the converter is 1650 ℃, the LF outlet temperature is 1580 ℃, the continuous casting is carried out at a constant speed, the target pulling speed is 0.9m/min, the soaking temperature of a billet is 1230 ℃, the finishing temperature is 865 ℃, the coiling temperature is 600 ℃, the front-stage cooling mode is adopted, the average grain size of the material is 12.0 grade, the yield strength is Rel 607MPa, the tensile strength is Rm 713MPa, and the elongation is 23.0%.
It should be noted that, each component or step in each embodiment may be intersected, replaced, added, and deleted, and therefore, the combination formed by these reasonable permutation and combination transformations shall also belong to the protection scope of the present invention, and shall not limit the protection scope of the present invention to the embodiments.
The foregoing is an exemplary embodiment of the present disclosure, and the order in which the embodiments of the present disclosure are disclosed is merely for the purpose of description and does not represent the advantages or disadvantages of the embodiments. It should be noted that the above discussion of any of the embodiments is merely exemplary and is not intended to suggest that the scope of the disclosure of embodiments of the invention (including the claims) is limited to these examples and that various changes and modifications may be made without departing from the scope of the invention as defined in the claims. The functions, steps and/or actions of the method claims in accordance with the disclosed embodiments described herein need not be performed in any particular order. Furthermore, although elements of the disclosed embodiments may be described or claimed in the singular, the plural is contemplated unless limitation to the singular is explicitly stated.
Those of ordinary skill in the art will appreciate that: the above discussion of any embodiment is merely exemplary and is not intended to imply that the scope of the disclosure of embodiments of the invention, including the claims, is limited to such examples; combinations of features of the above embodiments or in different embodiments are also possible within the idea of an embodiment of the invention, and there are many other variations of the different aspects of the embodiments of the invention as described above, which are not provided in detail for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, and the like, which are made within the spirit and principles of the embodiments of the invention, are included within the scope of the embodiments of the invention.
Claims (8)
1. The hot rolled steel strip for the high-strength corrosion-resistant hollow anchor rod welded pipe is characterized by comprising the following elements in percentage by weight: 0.18-0.23% of C, 0.15-0.30% of Si, 0.90-1.10% of Mn, less than or equal to 0.020% of P, less than or equal to 0.007% of S, 0.02-0.04% of Nb, 0.70-0.90% of Cr, 0.20-0.50% of Cu, 0.01-0.03% of Ti, 0.04-0.08% of Sb, and the balance of Fe and unavoidable impurities.
2. The hot rolled steel strip as claimed in claim 1 wherein the metallographic structure is ferrite + pearlite + granular bainite and the average grain size is 11 to 13.
3. The hot rolled steel strip as claimed in claim 1 wherein the yield strength Rel is not less than 600MPa, the tensile strength Rm is not less than 700MPa and the elongation is not less than 20%.
4. A method of producing hot rolled steel strip according to any one of claims 1 to 3 comprising the following steps in order: molten iron desulfurization, converter, LF refining, CC (continuous casting), hot rolling, laminar cooling and coiling.
5. The preparation method of the steel plate according to claim 4, wherein the steel plate is smelted and continuously cast into a plate blank according to the components, S is less than or equal to 0.008 percent when the steel plate is put into a converter, the tapping temperature of the converter is 1640-1660 ℃, calcium treatment is adopted after LF refining, the outlet temperature of LF is 1580+/-5 ℃, continuous casting is carried out at a constant speed, and the target pulling speed is 0.9-1.0 m/min.
6. The method according to claim 4, wherein in the hot rolling step, the billet is soaked at a temperature of 1210 to 1250 ℃ and is finished at a temperature of 840 to 880 ℃.
7. The method according to claim 4, wherein in the winding step, the winding temperature is 560℃to 620 ℃.
8. The method according to claim 4, wherein the laminar cooling step is performed by a front stage cooling method.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09118952A (en) * | 1995-10-20 | 1997-05-06 | Kobe Steel Ltd | Member made of high-strength hot rolled steel sheet having lower yield ratio |
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| US20210017636A1 (en) * | 2017-02-06 | 2021-01-21 | Jfe Steel Corporation | Galvanized steel sheet and method for manufacturing the same |
| US20210054477A1 (en) * | 2018-01-30 | 2021-02-25 | Jfe Steel Corporation | High-carbon hot-rolled steel sheet and method for producing the same |
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| JPH09118952A (en) * | 1995-10-20 | 1997-05-06 | Kobe Steel Ltd | Member made of high-strength hot rolled steel sheet having lower yield ratio |
| CN105779885A (en) * | 2014-12-23 | 2016-07-20 | 上海梅山钢铁股份有限公司 | Abrasion-resistant hot-rolled thin steel plate with good machining performance and manufacturing method of abrasion-resistant hot-rolled thin steel plate |
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| US20210017636A1 (en) * | 2017-02-06 | 2021-01-21 | Jfe Steel Corporation | Galvanized steel sheet and method for manufacturing the same |
| US20210054477A1 (en) * | 2018-01-30 | 2021-02-25 | Jfe Steel Corporation | High-carbon hot-rolled steel sheet and method for producing the same |
| CN111378900A (en) * | 2020-04-30 | 2020-07-07 | 鞍钢股份有限公司 | Wear-resistant and corrosion-resistant steel for chain plate and manufacturing method thereof |
| CN111411311A (en) * | 2020-04-30 | 2020-07-14 | 鞍钢股份有限公司 | Steel for die casting corrosion-resistant chain plate and manufacturing method thereof |
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