CN110791714A - 500MPa twisted steel with good welding performance and production method thereof - Google Patents
500MPa twisted steel with good welding performance and production method thereof Download PDFInfo
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- CN110791714A CN110791714A CN201911142413.2A CN201911142413A CN110791714A CN 110791714 A CN110791714 A CN 110791714A CN 201911142413 A CN201911142413 A CN 201911142413A CN 110791714 A CN110791714 A CN 110791714A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/08—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires for concrete reinforcement
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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Abstract
The invention relates to the technical field of metallurgy, in particular to a 500MPa twisted steel with good welding performance, which comprises the following chemical components in percentage by mass: 0.19-0.22% of C, 0.40-0.60% of Si, 1.20-1.30% of Mn, less than or equal to 0.035% of P, less than or equal to 0.035% of S, and the weight ratio of Cr: 0.06-0.12% of Fe, 0.040-0.045% of V and the balance of Fe, micro-nitrogen alloy and impurities, wherein Ceq is C + Mn/6+ (Cr + Mo + V)/5+ (Ni + Cu)/15 is controlled to be 0.40-0.48%, and C, Mn, Cr, Mo, V, Ni and Cu are the content of the elements in the steel. The deformed steel bar rolled by the process method provided by the invention has the advantages of low cost, high strength, high toughness, good ductility, fatigue resistance and good welding performance.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a 500MPa twisted steel with good welding performance and a production method thereof.
Background
In recent years, the market demand of building steel materials is increased sharply due to large-scale infrastructure and urbanization, wherein hot rolled steel bars are the building steel materials with the largest demand, and the requirement of industrial structures such as high-rise buildings on the bearing capacity of the steel bars is higher and higher. The market is increasing to higher grade high strength reinforcing bar demand, and research and development high strength reinforcing bar needs to add a large amount of V, Ti, Nb microalloy and strengthens its welding property and strength properties etc. but along with the increase of alloy demand, the price also continues to increase, and corresponding enterprise manufacturing cost is along with increasing, and iron and steel enterprise faces very serious survival pressure.
Disclosure of Invention
The invention aims to solve the technical problem of providing a 500MPa twisted steel bar with good welding performance and low cost and a production process method thereof.
The invention is realized by the following technical scheme:
the 500MPa twisted steel with good welding performance comprises the following chemical components in percentage by mass: 0.19-0.22% of C, 0.40-0.60% of Si, 1.20-1.30% of Mn, less than or equal to 0.035% of P, less than or equal to 0.035% of S, and the weight ratio of Cr: 0.06-0.12% of Fe, 0.040-0.045% of V and the balance of Fe, micro-nitrogen alloy and impurities, wherein Ceq is C + Mn/6+ (Cr + Mo + V)/5+ (Ni + Cu)/15 is controlled to be 0.40-0.48%, and C, Mn, Cr, Mo, V, Ni and Cu are the content of the elements in the steel.
Furthermore, the yield strength of the twisted steel is 520-600 MPa, the tensile strength is 680-780 MPa, the yield ratio is 1.30-1.50, and the maximum force total elongation Agt is 10-13%.
The production method of the 500MPa twisted steel with good welding performance comprises the following process flows:
the first step, smelting and continuous casting of molten steel, wherein oxygen is blown by a variable-lance variable-pressure method in the molten steel smelting process, the early lance position is 1.3m, and the flow rate is 24000m 3/h; 1.4-1.5m of the lance position in the process, 1.1m of the post-stage carbon-pulling lance position, 24000m3/h of flow, 1630-1720 ℃ of tapping temperature, 1570-1640 ℃ of post-argon temperature, and adding a carburant, a deoxidizer, an alloy and a micro-nitrogen alloy in the tapping process, wherein the molten steel comprises the following components in percentage by weight of 0.19-0.22% of C, 0.40-0.60% of Si, 1.20-1.30% of Mn, less than or equal to 0.035% of P, less than or equal to 0.035% of S, and Cr: 0.06-0.12% of V, 0.040-0.045% of V, argon blowing is carried out in the whole tapping process, the components are ensured to be uniform, and molten steel is conveyed to a continuous casting machine to be cast to obtain a billet;
and secondly, feeding the steel billet into a stepping heating furnace, uniformly heating the steel billet in a preheating section, a heating section and a soaking section, gradually heating the steel billet, removing phosphorus by high-pressure water, and then performing a rolling process.
Further, the temperature of the preheating section is controlled to be 820 +/-50 ℃, the temperature of the first heating section is controlled to be 930 +/-50 ℃, the temperature of the second heating section is controlled to be 1080 +/-50 ℃, the temperature of the soaking section is controlled to be 1150 +/-50 ℃, and the steel tapping temperature of the billet is controlled to be 1030 +/-30 ℃.
Further, in the rolling process, the rough rolling and the medium rolling realize the rolling of an austenite recrystallization region, the pre-finish rolling realizes the rolling of an austenite non-recrystallization region, and the finishing mill group realizes the rolling of an austenite and ferrite two-phase region by controlling the rolling temperature;
further, the rolling temperature is controlled, wherein the initial rolling temperature is controlled to be 1030 +/-30 ℃, the pre-finish rolling temperature is controlled to be 900 +/-30 ℃, and the finish rolling temperature is controlled to be 800 +/-30 ℃.
The invention has the advantages of
The 500MPa deformed steel bar with good welding performance and the production method thereof are characterized in that micro-nitrogen alloy is added during smelting, vanadium micro-alloy is reduced, the micro-nitrogen alloy is used for producing the deformed steel bar, Ceq is C + Mn/6+ (Cr + Mo + V)/5+ (Ni + Cu)/15 is controlled within the range of 0.40-0.48%, and the heating temperature and the rolling temperature of a steel billet are controlled, so that the produced deformed steel bar is low in cost, high in strength, high in toughness, good in ductility and fatigue resistance, and good in welding performance.
Detailed Description
The 500MPa twisted steel with good welding performance comprises the following chemical components in percentage by mass: 0.19-0.22% of C, 0.40-0.60% of Si, 1.20-1.30% of Mn, less than or equal to 0.035% of P, less than or equal to 0.035% of S, and the weight ratio of Cr: 0.06-0.12% of Fe, 0.040-0.045% of V and the balance of Fe, micro-nitrogen alloy and impurities, wherein Ceq is C + Mn/6+ (Cr + Mo + V)/5+ (Ni + Cu)/15 is controlled to be 0.40-0.48%, and C, Mn, Cr, Mo, V, Ni and Cu are the content of the elements in the steel.
Furthermore, the yield strength of the twisted steel is 520-600 MPa, the tensile strength is 680-780 MPa, the yield ratio is 1.30-1.50, and the maximum force total elongation Agt is 10-13%.
The production method of the 500MPa twisted steel with good welding performance comprises the following process flows:
firstly, smelting and continuously casting molten steel, wherein oxygen is blown by a variable-gun variable-pressure method in the molten steel smelting process, the early-stage gun position is 1.3m, and the flow rate is 24000m 3/h; 1.4-1.5m of the lance position in the process, 1.1m of the post-stage carbon-pulling lance position, 24000m3/h of flow, 1630-1720 ℃ of tapping temperature, 1570-1640 ℃ of post-argon temperature, and adding a carburant, a deoxidizer, an alloy and a micro-nitrogen alloy in the tapping process, wherein the molten steel comprises the following components in percentage by weight of 0.19-0.22% of C, 0.40-0.60% of Si, 1.20-1.30% of Mn, less than or equal to 0.035% of P, less than or equal to 0.035% of S, and Cr: 0.06-0.12% of V, 0.040-0.045% of V, argon blowing is carried out in the whole tapping process, the components are ensured to be uniform, and molten steel is conveyed to a continuous casting machine to be cast to obtain a billet;
and secondly, feeding the steel billet into a stepping heating furnace, uniformly heating the steel billet in a preheating section, a heating section and a soaking section, gradually heating the steel billet, removing phosphorus by high-pressure water, and then performing a rolling process.
Specifically, the temperature of the preheating section is controlled to be 820 +/-50 ℃, the temperature of the first heating section is controlled to be 930 +/-50 ℃, the temperature of the second heating section is controlled to be 1080 +/-50 ℃, the temperature of the soaking section is controlled to be 1150 +/-50 ℃, and the steel tapping temperature of the billet is controlled to be 1030 +/-30 ℃.
Further, in the rolling process, the rough rolling and the medium rolling realize the rolling of an austenite recrystallization region, the pre-finish rolling realizes the rolling of an austenite non-recrystallization region, and the finishing mill group realizes the rolling of an austenite and ferrite two-phase region by controlling the rolling temperature;
specifically, the rolling temperature is controlled, wherein the initial rolling temperature is controlled to be 1030 +/-30 ℃, the pre-finish rolling temperature is controlled to be 900 +/-30 ℃, and the finish rolling temperature is controlled to be 800 +/-30 ℃.
The deformed steel bar rolled by the process method meets the national standard requirements in all indexes, has good strength, toughness, ductility and fatigue resistance, and the spot-check data of each batch are shown in the following table:
the 500MPa deformed steel bar with good welding performance and the production method thereof are protected by the invention, the micro-nitrogen alloy is added during smelting, the vanadium micro-alloy is reduced, the micro-nitrogen alloy is used for producing the deformed steel bar, the Ceq is controlled to be C + Mn/6+ (Cr + Mo + V)/5+ (Ni + Cu)/15 within the range of 0.40-0.48%, and the heating temperature and the rolling temperature of a steel billet are controlled, so that the produced deformed steel bar not only has low cost, but also has high strength, high toughness, good ductility and fatigue resistance, and the steel has good welding performance.
In conclusion, the 500MPa deformed steel bar with good welding performance and the deformed steel bar rolled by the production process method are low in cost, high in strength, high in toughness, good in ductility, good in fatigue resistance and good in welding performance.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. 500MPa twisted steel with good welding performance is characterized in that the twisted steel comprises the following chemical components in percentage by mass: 0.19-0.22% of C, 0.40-0.60% of Si, 1.20-1.30% of Mn, less than or equal to 0.035% of P, less than or equal to 0.035% of S, and the weight ratio of Cr: 0.06-0.12%, V0.040-0.045%, and the balance Fe, micro-nitrogen alloy and impurities, wherein
Ceq is C + Mn/6+ (Cr + Mo + V)/5+ (Ni + Cu)/15 and is controlled to be 0.40-0.48%, wherein C, Mn, Cr, Mo, V, Ni and Cu are the content of the elements in the steel.
2. The 500MPa twisted steel with good welding performance according to claim 1, wherein the yield strength of the twisted steel is 520-600 MPa, the tensile strength is 680-780 MPa, the ratio of the yield strength is 1.30-1.50, and the total elongation at maximum force Agt is 10-13%.
3. The production method of the 500MPa twisted steel with good welding performance is characterized by comprising the following process flows of:
the first step, smelting and continuous casting of molten steel, wherein oxygen is blown by a variable-lance variable-pressure method in the molten steel smelting process, the early lance position is 1.3m, and the flow rate is 24000m 3/h; 1.4-1.5m of the lance position in the process, 1.1m of the post-stage carbon-pulling lance position, 24000m3/h of flow, 1630-1720 ℃ of tapping temperature, 1570-1640 ℃ of post-argon temperature, and adding a carburant, a deoxidizer, an alloy and a micro-nitrogen alloy in the tapping process, wherein the molten steel comprises the following components in percentage by weight of 0.19-0.22% of C, 0.40-0.60% of Si, 1.20-1.30% of Mn, less than or equal to 0.035% of P, less than or equal to 0.035% of S, and Cr: 0.06-0.12% of V, 0.040-0.045% of V, argon blowing is carried out in the whole tapping process, the components are ensured to be uniform, and molten steel is conveyed to a continuous casting machine to be cast to obtain a billet;
and secondly, feeding the steel billet into a stepping heating furnace, uniformly heating the steel billet in a preheating section, a heating section and a soaking section, gradually heating the steel billet, removing phosphorus by high-pressure water, and then performing a rolling process.
4. The method for producing 500MPa twisted steel with good weldability according to claim 3, characterized in that the temperature of the preheating section is controlled at 820 ± 50 ℃, the temperature of the first heating section is controlled at 930 ± 50 ℃, the temperature of the second heating section is controlled at 1080 ± 50 ℃, the temperature of the soaking section is controlled at 1150 ± 50 ℃, and the steel tapping temperature of the billet is controlled at 1030 ± 30 ℃.
5. The method for producing 500MPa twisted steel with good welding performance according to claim 3, wherein the rolling process is characterized in that the rough rolling and the medium rolling are performed in an austenite recrystallization region through control of rolling temperature, the pre-finish rolling is performed in an austenite non-recrystallization region, and the finishing mill group is performed in an austenite and ferrite two-phase region.
6. The method for producing a 500MPa twisted steel bar with excellent weldability according to claim 5, wherein the rolling temperature is controlled such that the initial rolling temperature is controlled to 1030 ± 30 ℃, the pre-finish rolling temperature is controlled to 900 ± 30 ℃, and the finish rolling temperature is controlled to 800 ± 30 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911142413.2A CN110791714A (en) | 2019-11-20 | 2019-11-20 | 500MPa twisted steel with good welding performance and production method thereof |
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| CN201911142413.2A CN110791714A (en) | 2019-11-20 | 2019-11-20 | 500MPa twisted steel with good welding performance and production method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111961986A (en) * | 2020-08-26 | 2020-11-20 | 盐城市联鑫钢铁有限公司 | High-strength corrosion-resistant steel bar and manufacturing method thereof |
| CN112143967A (en) * | 2020-08-26 | 2020-12-29 | 盐城市联鑫钢铁有限公司 | Low-cost micro-vanadium ultrafine-grained steel bar and rolling process thereof |
| CN112692053A (en) * | 2020-12-10 | 2021-04-23 | 四川德胜集团钒钛有限公司 | Steel rolling process of vanadium-titanium steel bar |
| CN112831725A (en) * | 2021-01-04 | 2021-05-25 | 盐城市联鑫钢铁有限公司 | Microcrystallized hot-rolled steel bar and production process method |
| CN114150223A (en) * | 2021-11-29 | 2022-03-08 | 石横特钢集团有限公司 | High-strength anti-seismic reinforcing steel bar special for railway and production process thereof |
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| CN104831183A (en) * | 2015-05-29 | 2015-08-12 | 武钢集团昆明钢铁股份有限公司 | 1080MPa high-strength corrosion-resistance twisted steel for prestressed structure and preparation method of 1080MPa high-strength corrosion-resistance twisted steel |
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Patent Citations (2)
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| CN103924165A (en) * | 2014-03-26 | 2014-07-16 | 首钢水城钢铁（集团）有限责任公司 | Production method of HRB500 screw bar having yield point jog |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111961986A (en) * | 2020-08-26 | 2020-11-20 | 盐城市联鑫钢铁有限公司 | High-strength corrosion-resistant steel bar and manufacturing method thereof |
| CN112143967A (en) * | 2020-08-26 | 2020-12-29 | 盐城市联鑫钢铁有限公司 | Low-cost micro-vanadium ultrafine-grained steel bar and rolling process thereof |
| CN112143967B (en) * | 2020-08-26 | 2021-06-15 | 盐城市联鑫钢铁有限公司 | Low-cost micro-vanadium ultrafine-grained steel bar and rolling process thereof |
| CN112692053A (en) * | 2020-12-10 | 2021-04-23 | 四川德胜集团钒钛有限公司 | Steel rolling process of vanadium-titanium steel bar |
| CN112831725A (en) * | 2021-01-04 | 2021-05-25 | 盐城市联鑫钢铁有限公司 | Microcrystallized hot-rolled steel bar and production process method |
| CN114150223A (en) * | 2021-11-29 | 2022-03-08 | 石横特钢集团有限公司 | High-strength anti-seismic reinforcing steel bar special for railway and production process thereof |
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