CN114000060B - Production method of high-strength low-temperature-impact-resistant phosphorus-containing high-strength steel strip - Google Patents
Production method of high-strength low-temperature-impact-resistant phosphorus-containing high-strength steel strip Download PDFInfo
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Abstract
The invention relates to a production method of a high-strength low-temperature impact resistant phosphorus-containing high-strength steel strip, belonging to the technical field of steel rolling. The components are as follows: less than or equal to 0.0035 percent of C, 0.50 to 0.60 percent of Si, 0.50 to 0.60 percent of Mn, 0.08 to 0.10 percent of P, less than or equal to 0.010 percent of S, 0.025 to 0.060 percent of Als, 0.02 to 0.05 percent of Ti, 0.02 to 0.04 percent of Nb, 0.0008 to 0.0020 percent of B, less than or equal to 0.004 percent of N, and the balance of Fe, inevitable impurities and residual elements. The preparation method comprises the following steps: (1) KR desulfurization; (2) smelting in a converter; (3) continuous casting; (4) hot rolling; (5) acid rolling; and (6) annealing. According to the invention, through reasonable chemical composition design and process control, the cold-rolled steel strip product with high strength and low-temperature impact resistance is finally obtained.
Description
Technical Field
The invention relates to the technical field of steel rolling, in particular to a production method of a high-strength low-temperature impact resistant phosphorus-containing high-strength steel strip.
Background
The phosphorus-containing high-strength steel is formed by adding solid solution strengthening elements such as P, mn and Si and strong carbon and nitride forming elements such as Nb and Ti on the basis of IF steel (interstitial-free steel) to fix interstitial atoms such as carbon and nitrogen existing in the steel, so that the steel has high strength and good forming performance. Because the content of phosphorus in steel is high, phosphorus is easy to precipitate in a FeTiP precipitation phase and segregates in a grain boundary to cause the grain boundary brittleness of the steel, and the cracking phenomenon is easy to occur during low-temperature stamping.
The development of light weight of automobiles becomes one of the development trends of the current automobile and enterprise manufacturing industry, and the steel plate with good formability and high strength is widely applied to the automobile manufacturing industry. The high-strength steel containing phosphorus has high strength and good forming performance, is particularly suitable for manufacturing stamping parts which require certain stamping performance and have high strength, and the steel plate can be used for properly reducing the thickness of automobile stamping parts so as to reduce the self weight of automobiles and obtain good economic benefit.
With the proposal of automobile light weight, the reduction of the supply thickness and the improvement of the performance of the cold-rolled low-carbon phosphorus-containing high-strength steel plate serving as an automobile substrate are trends of production and development, and higher requirements are put forward for the production of steel supply enterprises. How to provide a steel plate with stable strength, low-temperature impact resistance and good surface quality on the premise of reducing the cost is a common problem for steel supply enterprises.
In Chinese patent CN105861929A, 440MPa grade cold-rolled high-strength IF steel is obtained by adopting a high-silicon and high-manganese component system. However, this patent does not teach whether the composition is designed to provide a product that meets low temperature impact resistance. The Chinese patent CN112143860A adopts a production method of a low-carbon, low-silicon, high-phosphorus manganese and Nb + Ti composite component system to obtain high-strength interstitial-free steel with yield strength of more than 250 MPa. The alloy addition cost in this patent is relatively high.
Disclosure of Invention
Aiming at the problems of high alloy cost and low-temperature impact resistance under high strength in the prior art, the invention provides a production method of a high-strength low-temperature impact resistance phosphorus-containing high-strength steel strip, which aims to solve the technical problems. The invention realizes low-temperature impact resistance on the premise that the product performance meets the requirements by reasonably designing the chemical components of the product and controlling the addition amount of boron. The steel-making, hot rolling and cold rolling production processes are controlled, so that the cold rolled products meet the requirements of steel plates with yield more than or equal to 250MPa, tensile strength more than or equal to 440MPa, secondary processing embrittlement temperature less than or equal to-60 ℃, low cost and good product surface performance.
The technical scheme of the invention is as follows:
the high-strength low-temperature impact resistant phosphorus-containing high-strength steel comprises the following components: less than or equal to 0.0035 percent of C, 0.50 to 0.60 percent of Si, 0.50 to 0.60 percent of Mn, 0.08 to 0.10 percent of P, less than or equal to 0.010 percent of S, 0.025 to 0.060 percent of Als, 0.02 to 0.05 percent of Ti, 0.02 to 0.04 percent of Nb, 0.0008 to 0.0020 percent of B, less than or equal to 0.004 percent of N, and the balance of Fe, inevitable impurities and residual elements.
A production method of a high-strength low-temperature impact resistant phosphorus-containing high-strength steel strip adopts the phosphorus-containing high-strength steel as a raw material, and the preparation method comprises the following steps: (1) KR desulfurization; (2) smelting in a converter; (3) continuous casting; (4) hot rolling; (5) acid rolling; and (6) annealing.
In the step (1), after KR desulfurization is finished, S is required to be less than or equal to 0.003 percent, and the bright surface is required to be more than or equal to 95 percent after slag skimming.
In the step (2), the end point temperature of the converter is 1680-1720 ℃.
In the step (3), the upper surface and the lower surface need to be scalped after the head plate blank and the tail plate blank are off-line, and the scalping depth is controlled on site and is generally between 3mm and 4mm.
In the step (4), the heating time of the plate blank in the heating furnace is divided according to a furnace loading mode and a plate blank state, and the hot material: 140-260 min; cooling: 165-280 min; the tapping temperature of the plate blank is divided according to the thickness of a hot rolling material, the thickness of the hot rolling material is less than or equal to 2.75mm, and the temperature is set to be 1230-1270 ℃; the thickness of the hot rolled material is more than 2.75mm and less than or equal to 6.0mm, and the temperature is set to be 1220-1260 ℃.
Preferably, in the step (4), the finish rolling temperature is 920 +/-15 ℃, the finish rolling is ensured to be rolled in an austenite region, and a uniform ferrite structure can be obtained through the rolling process.
Preferably, in the step (4), the curling is a U-shaped curling, and in order to reduce the load of the curling machine and the occurrence of the internal oxidation phenomenon, the middle curling temperature is set to be 700 +/-15 ℃, and the head and tail curling temperature is set to be 730 +/-15 ℃.
Preferably, in the step (4), the section convexity of the hot-rolled finished product is controlled to be 30-60 μm, and the wedge shape is controlled to be-30 μm.
Preferably, in the step (5), the acid rolling is performed by adopting three-stage turbulent acid washing, and the temperature of the acid liquor is controlled to be 70-90 ℃; the pickling speed is more than or equal to 100m/min.
Preferably, in the step (5), a five-frame six-roller mill is adopted for cold continuous rolling, the total cold rolling reduction rate is 50% -80%, and the reduction rate models of all frames are automatically calculated.
Preferably, in the step (6), the steel strip after acid rolling is continuously annealed, the soaking temperature is set to 820-840 ℃, and the slow cooling tapping temperature is not more than 155 ℃.
Preferably, in the step (6), the annealed steel coil is subjected to a leveling treatment, and the leveling elongation is set to 0.6%.
The invention has the beneficial effects that:
the invention realizes low-temperature impact resistance on the premise that the product performance meets the requirement by reasonable chemical component design and controlling the addition amount of boron. Controlling the steelmaking smelting, the hot rolling process and the cold rolling process to finally obtain a cold rolled steel strip product with high strength and low temperature impact resistance, wherein the performance of the obtained cold rolled steel strip meets the requirements, the secondary working embrittlement temperature reaches-60 ℃, the cold rolled steel strip product resists impact and meets the actual use requirements of being used as a high-strength stamping steel plate.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a metallographic picture of a high strength phosphorus-containing steel strip rolled in example 1 of the present invention (100X).
FIG. 2 is a metallographic picture of a phosphorous-containing high-strength steel strip rolled in example 1 of the present invention (200X).
FIG. 3 is a graph showing the effects of the secondary work embrittlement test in example 1 of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A production method of a high-strength low-temperature impact resistant phosphorus-containing high-strength steel strip adopts the phosphorus-containing high-strength steel as a raw material, and the preparation method comprises the following steps:
(1) KR desulfurization: and performing KR method desulfurization on the molten steel. After the desulfurization is finished, the S is less than or equal to 0.003 percent, and the bright surface is required to be more than or equal to 95 percent after slagging off.
(2) Smelting in a converter: and (4) smelting the desulfurized molten steel in a converter, wherein the end point temperature of the converter is 1700 ℃.
The components in the molten steel are detected as follows: 0.0021% of C, 0.50% of Si, 0.58% of Mn, 0.098% of P, 0.006% of S, 0.026% of Als, 0.029% of Ti, 0.033% of Nb, 0.0014% of B and 0.0035% of N.
(3) Continuous casting: continuously casting the smelted molten steel, wherein the thickness of a casting blank is 230mm; and (3) peeling the upper surface and the lower surface after the head plate blank and the tail plate blank are off-line, wherein the peeling thickness of the upper surface is 3mm, and the peeling thickness of the lower surface is 3mm.
(4) Hot rolling: and (3) carrying out hot rolling on the cooled casting blank, wherein the heating temperature is 1228 ℃, the heating time is 225min, and the final rolling temperature is 917 ℃. The U-shaped curling is adopted during curling, and the middle curling temperature is 711 ℃. The thickness of the hot rolled material is 3.2mm, the cross-sectional convexity of the hot rolled finished product is 59 μm, and the wedge shape is 9 μm.
(5) Acid rolling: the acid washing is carried out by adopting three-stage turbulent flow, the temperature of the acid liquid is controlled at 85 ℃, and the acid washing speed is 139m/min. And the cold rolling is carried out by adopting a five-stand six-roller mill. The thickness of the finished product is 1.2mm, and the total rolling reduction rate of the cold rolling is 62.5%.
(6) Annealing: and continuously annealing the steel strip after acid rolling, setting the soaking temperature to be 832 ℃ and setting the slow cooling tapping temperature to be 145 ℃. And (4) carrying out flattening treatment on the annealed steel coil, wherein the flattening elongation is set to be 0.6%.
Example 2
A production method of a high-strength low-temperature impact resistant phosphorus-containing high-strength steel strip adopts the phosphorus-containing high-strength steel as a raw material, and the preparation method comprises the following steps:
(1) KR desulfurization: and performing KR method desulfurization on the molten steel. After the desulfurization is finished, the S is less than or equal to 0.003 percent, and the bright surface is required to be more than or equal to 95 percent after slagging off.
(2) Smelting in a converter: and (4) smelting the desulfurized molten steel in a converter, wherein the end point temperature of the converter is 1705 ℃.
The components in the molten steel are detected as follows: 0.0023 percent of C, 0.50 percent of Si, 0.59 percent of Mn, 0.092 percent of P, 0.008 percent of S, 0.033 percent of Als, 0.030 percent of Ti, 0.035 percent of Nb, 0.0015 percent of B and 0.0037 percent of N.
(3) Continuous casting: continuously casting the smelted molten steel, wherein the thickness of a casting blank is 230mm; and (3) peeling the upper surface and the lower surface after the head plate blank and the tail plate blank are off-line, wherein the peeling thickness of the upper surface is 3mm, and the peeling thickness of the lower surface is 4mm.
(4) Hot rolling: and (3) carrying out hot rolling on the cooled casting blank, wherein the heating temperature is 1225 ℃, the heating time is 216min, and the finish rolling temperature is 915 ℃. The U-shaped curling is adopted during curling, and the middle curling temperature is 714 ℃. The thickness of the hot rolled material was 3.2mm, the cross-sectional convexity of the hot rolled product was 54 μm, and the wedge shape was 30 μm.
(5) Acid rolling: three-stage turbulent acid pickling is adopted, the temperature of acid liquor is controlled at 85 ℃, and the acid pickling speed is 140m/min. And the cold rolling is carried out by adopting a five-stand six-roller mill. The thickness of the finished product is 1.2mm, and the total rolling reduction rate of cold rolling is 62.5%.
(6) And (3) annealing: and continuously annealing the steel strip after the acid rolling, setting the soaking temperature to 823 ℃ and the slow cooling tapping temperature to 151 ℃. And (4) carrying out flattening treatment on the annealed steel coil, wherein the flattening elongation is set to be 0.6%.
Example 3
A production method of a high-strength low-temperature impact resistant phosphorus-containing high-strength steel strip adopts the phosphorus-containing high-strength steel as a raw material, and the preparation method comprises the following steps:
(1) KR desulfurization: and performing KR method desulfurization on the molten steel. After the desulfurization is finished, the S is less than or equal to 0.003 percent, and the bright surface is required to be more than or equal to 95 percent after slagging off.
(2) Smelting in a converter: and (4) smelting the desulfurized molten steel in a converter, wherein the end point temperature of the converter is 1695 ℃.
The components in the molten steel are detected as follows: 0.0034% of C, 0.50% of Si, 0.58% of Mn, 0.088% of P, 0.007% of S, 0.028% of Als, 0.029% of Ti, 0.032% of Nb, 0.0008% of B and 0.0034% of N.
(3) Continuous casting: continuously casting the smelted molten steel, wherein the thickness of a casting blank is 230mm; and (3) peeling the upper surface and the lower surface after the head plate blank and the tail plate blank are off-line, wherein the peeling thickness of the upper surface is 4mm, and the peeling thickness of the lower surface is 3mm.
(4) Hot rolling: and (3) carrying out hot rolling on the cooled casting blank, wherein the heating temperature is 1225 ℃, the heating time is 227min, and the finish rolling temperature is 913 ℃. U-shaped curling is adopted during curling, and the middle curling temperature is 690 ℃. The thickness of the hot rolled material is 3.0mm, the convexity of the section of the hot rolled finished product is 34 μm, and the wedge shape is 19 μm.
(5) Acid rolling: three-stage turbulent acid washing is adopted, the temperature of acid liquor is controlled at 85 ℃, and the acid washing speed is 139m/min. And the cold rolling is carried out by adopting a five-stand six-roller mill. The thickness of the finished product is 1.0mm, and the total rolling reduction rate of the cold rolling is 66.7%.
(6) And (3) annealing: and continuously annealing the steel strip after acid rolling, setting the soaking temperature to be 822 ℃ and the slow cooling tapping temperature to be 150 ℃. And (4) carrying out flattening treatment on the annealed steel coil, wherein the flattening elongation is set to be 0.6%.
Test example
The high-strength low-temperature impact resistant phosphorus-containing high-strength steel strips prepared in examples 1 to 3 were sampled and analyzed, and the performance results are shown in table 1, and the microstructures of example 1 are shown in fig. 1 and 2.
TABLE 1 product Performance test results
As can be seen from the table 1, the yield strength of the continuous uncoiled phosphorus-containing high-strength steel produced by the invention can meet the requirement of being more than or equal to 250MPa, the plastic strain ratio can reach more than or equal to 1.5, the continuous uncoiled phosphorus-containing high-strength steel has better stamping performance, the secondary working embrittlement temperature is less than or equal to minus 60 ℃ on the basis of meeting the requirement of high yield strength, and the continuous uncoiled phosphorus-containing high-strength steel has good low-temperature impact resistance. The quality problem is not easy to occur in the deep processing processes of rolling, stamping and the like of users, and the steel plate is in accordance with the use characteristics of the steel plate as a structural steel plate.
The secondary work embrittlement test is carried out on the high-strength low-temperature impact resistant phosphorus-containing high-strength steel strip prepared in the example 1, and the test effect graph is shown in figure 3.
As can be seen from figure 3, the secondary working embrittlement temperature of the high-strength low-temperature impact-resistant phosphorus-containing high-strength steel produced by the method reaches-60 ℃, the steel can bear a-60 ℃ low-temperature impact test, and the conditions of cracking and the like in the stamping process of a user are reduced.
Although the present invention has been described in detail by referring to the drawings in connection with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions should be within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present disclosure and the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. The high-strength low-temperature impact resistant phosphorus-containing high-strength steel is characterized by comprising the following components: less than or equal to 0.0035 percent of C, 0.50 to 0.60 percent of Si, 0.50 to 0.60 percent of Mn, 0.08 to 0.10 percent of P, less than or equal to 0.010 percent of S, 0.025 to 0.060 percent of Als, 0.02 to 0.05 percent of Tis, 0.02 to 0.04 percent of Nb, 0.0008 to 0.0020 percent of B, less than or equal to 0.004 percent of N, and the balance of Fe, inevitable impurities and residual elements;
the high-strength low-temperature impact-resistant phosphorus-containing high-strength steel meets the requirements that the yield is more than or equal to 250MPa, the tensile strength is more than or equal to 440MPa, and the secondary processing embrittlement temperature is less than or equal to minus 60 ℃;
the production method comprises the following steps: (1) KR desulfurization; (2) smelting in a converter; (3) continuous casting; (4) hot rolling; (5) acid rolling; (6) annealing;
in the step (1), after KR desulfurization is finished, S is required to be less than or equal to 0.003 percent, and the bright surface is required to be more than or equal to 95 percent after slag skimming;
in the step (2), the end point temperature of the converter is 1680-1720 ℃;
in the step (3), after the head and tail plate blanks are off-line, peeling treatment needs to be carried out on the upper and lower surfaces;
in the step (4), the heating time of the slab in the heating furnace is divided according to the furnace loading mode and the slab state, and the hot material: 140-260 min; cooling: 165-280 min; dividing the discharging temperature of the plate blank according to the thickness of the hot rolled material, wherein the thickness of the hot rolled material is less than or equal to 2.75mm, and the temperature is set to be 1230-1270 ℃; the thickness of the hot rolled material is more than 2.75 and less than or equal to 6.0mm, and the temperature is set to be 1220-1260 ℃; u-shaped curling is adopted for curling, and the middle curling temperature is set to be 700 +/-15 ℃, and the head and tail curling temperature is set to be 730 +/-15 ℃;
in the step (5), the acid rolling is carried out by adopting three-section type turbulent acid washing, and the temperature of the acid liquor is controlled to be 70-90 ℃; the pickling speed is more than or equal to 100m/min.
2. The high-strength low-temperature impact resistant phosphorus-containing high-strength steel as claimed in claim 1, wherein the finish rolling temperature in step (4) is 920 ± 15 ℃.
3. The high strength low temperature impact resistant phosphorus containing high strength steel according to claim 1, wherein in the step (4), the hot rolled finished product has a section crown controlled to 30 μm to 60 μm and a wedge controlled to-30 μm to 30 μm.
4. The high-strength low-temperature impact resistant phosphorus-containing high-strength steel according to claim 1, wherein in the step (5), a five-stand six-roll mill is adopted for cold continuous rolling, the total cold rolling reduction rate is 50-80%, and the reduction rate model of each stand is automatically calculated.
5. The high-strength low-temperature impact resistant phosphorus-containing high-strength steel as claimed in claim 1, wherein in the step (6), the acid-rolled steel strip is continuously annealed, the soaking temperature is set to 820 ℃ to 840 ℃, and the slow cooling tapping temperature is 155 ℃ or less.
6. The high-strength low-temperature-impact-resistant phosphorus-containing high-strength steel according to claim 1, wherein in the step (6), the annealed steel coil is subjected to a flattening treatment, and the flattening elongation is set to 0.6%.
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| US4830686A (en) * | 1984-04-12 | 1989-05-16 | Kawasaki Steel Corporation | Low yield ratio high-strength annealed steel sheet having good ductility and resistance to secondary cold-work embrittlement |
| JP2755014B2 (en) * | 1991-12-11 | 1998-05-20 | 日本鋼管株式会社 | Method for producing high-strength cold-rolled steel sheet for deep drawing with excellent secondary work brittleness resistance |
| JPH07179946A (en) * | 1993-12-24 | 1995-07-18 | Kawasaki Steel Corp | Production of high workability high tensile strength cold rolled steel plate excellent in secondary working brittleness resistance |
| JP3840855B2 (en) * | 1999-02-15 | 2006-11-01 | Ｊｆｅスチール株式会社 | High-strength thin steel sheet with excellent secondary work brittleness resistance and formability and method for producing the same |
| JP3829621B2 (en) * | 2000-05-31 | 2006-10-04 | 住友金属工業株式会社 | High-tensile cold-rolled steel sheet and its manufacturing method |
| JP2004256895A (en) * | 2003-02-27 | 2004-09-16 | Jfe Steel Kk | Method for manufacturing high-strength galvanized steel sheet of excellent secondary work-embrittlement resistance |
| KR20140095101A (en) * | 2011-12-27 | 2014-07-31 | 신닛테츠스미킨 카부시키카이샤 | Hot-dip plated high-strength steel sheet for press working with excellent low-temperature toughness and corrosion resistance, and process for producing same |
| CN103451531A (en) * | 2013-09-03 | 2013-12-18 | 辽宁科技大学 | 440MPa of precipitation strengthening-type cold rolled interstitial free (IF) steel containing niobium and production method thereof |
| CN106906415A (en) * | 2015-12-23 | 2017-06-30 | 本钢板材股份有限公司 | It is a kind of to improve cold rolling IF and phosphorate the method for high-strength steel brittle transition temperature |
| CN105861929B (en) * | 2016-04-15 | 2017-11-21 | 邯郸钢铁集团有限责任公司 | A kind of 440MPa levels Cold Rolled High Strength IF Steel and its production method |
| CN106222542A (en) * | 2016-08-29 | 2016-12-14 | 唐山钢铁集团有限责任公司 | One phosphorates high-strength IF steel substrate and production method thereof |
| CN111748735A (en) * | 2020-06-22 | 2020-10-09 | 武汉钢铁有限公司 | Band steel with excellent low-temperature secondary processing performance and tensile strength of 390MPa and production method thereof |
| CN111705263B (en) * | 2020-06-22 | 2022-01-04 | 武汉钢铁有限公司 | Strip steel with excellent low-temperature secondary processing performance and tensile strength of 440MPa and production method thereof |
| CN112143860B (en) * | 2020-09-10 | 2022-06-03 | 山东钢铁集团日照有限公司 | Production method of 250 MPa-grade high-strength interstitial-free steel |
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