CN104745940A - Rust-resistant hot rolled ribbed bar and production process thereof - Google Patents
Rust-resistant hot rolled ribbed bar and production process thereof Download PDFInfo
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Abstract
The invention discloses a rust-resistant hot rolled ribbed bar and a production process thereof. The chemical components of the ribbed bar comprise C, Si, Mn, V, Cr, P and S, wherein the percentages by weight of the chemical components are as follows: 0.20-0.25% of C, 0.40-0.60% of Si, 0.90-1.10% of Mn, 0.010-0.020% of V, 0.15-0.25% of Cr, not larger than 0.042% of P, not larger than 0.040% of S and the balance of iron and unavoidable impurities. The production process mainly comprises the following steps: (1) preparation of blast furnace molten iron; (2) top-blown converter smelting; (3) LF furnace molten steel refining; (4) continuous casting; (5) rolling steel production; (6) cooling treatment. The rust-resistant hot rolled ribbed bar disclosed by the invention has the advantages that the chemical components of the ribbed bar are optimized, the addition amount of alloy elements is adjusted, the alloy cost is greatly reduced, the rolled cooling strength is reduced, the mechanical properties of the bar are guaranteed, damage of the strong water penetration cooling process on iron oxide coating on the surface of the ribbed bar after rolling is avoided as well, and the rust resistance of the ribbed bar is guaranteed.
Description
Technical field
The invention belongs to metallurgy and metallic substance manufacture field, be specifically related to a kind of resistant to tarnishing hot rolled ribbed steel bar and production technique thereof.
Background technology
Domestic hot-rolled ribbed steel bars for ther reinforcement of concrete (being commonly called as hot-rolled ribbed bars) uses the production technique of naturally cooling after hot rolling always, the Ribbed Bar rust resistance of this explained hereafter is better, and in same geographic area, the product corrosion situation of different manufacturer does not have significant difference.Extensively adopted by many manufacturing enterprises by the rolling technology rolling rear strong Water cooling raising reinforced steel bar strength thus reduction hot rolled ribbed steel bar cost of alloy, rear strong Water cooling technique is rolled in employing can make hot-rolled ribbed bars cost of alloy reduce 50-100 yuan/ton under the prerequisite ensureing reinforcement property.
The production technique of current domestic hot rolled ribbed steel bar is divided into two types substantially, one is naturally cooling production technique after traditional hot rolling, another is strong Water cooling technique after hot rolling, the former needs in reinforcing bar, add a certain amount of reinforced alloys element, the rust resistance of its Ribbed Bar is better, the reinforcing bar interalloy addition of rear a kind of explained hereafter can significantly reduce saving cost of alloy, the resistant to tarnishing of its Ribbed Bar is poor, but there is respective deficiency respectively in two kinds of techniques of domestic production hot rolled ribbed steel bar at present, after traditional hot rolling, the deficiency of naturally cooling technique is: rely on add the mechanical property that reinforced alloys element ensures reinforcing bar completely, reinforcing bar cost of alloy is higher, the temperature parameter of steel is not done and effectively control thus rationally play rolling temperature to the influence of reinforcement property, after hot rolling, the deficiency of strong Water cooling technique is: the performance being ensured reinforcing bar by Water cooling strong after hot rolling, although the cost of alloy of reinforcing bar can be reduced, but its maximum problem is that corrosion rate and corrosion degree will far away higher than the reinforcing bars that traditional technology is produced in an atmosphere for the reinforcing bar produced, and reinforcing bar easily produces harmful metallographic structure that national standard does not allow to exist in addition.
Therefore need to be optimized two kinds of rolling technologys of existing hot rolled ribbed steel bar and to improve, give full play to the advantage of two kinds of techniques, evade respective inferior position, with the most rational alloying constituent, give full play to the strengthening effect of rolling technology to reinforcing bar, ensure the resistant to tarnishing ability that reinforcing bar is good simultaneously.
Hot rolled ribbed steel bar for puzzlement enterprise rolls wears by force the corrosion problem after water afterwards, online or the off-line of the positive exploratory development of more domestic enterprises to the technology of rebar surface rust prevention by applying liquid material agent, these technology due to immature, impracticable, to drop into improvement cost high or cause the reasons such as environmental pollution do not approved by industry and promote the use of.So many enterprises can only abandon hot-rolled reinforced bar roll rear strong Water cooling technique, re-use naturally cooling technique after traditional hot rolling.
Summary of the invention
The object of this invention is to provide a kind of resistant to tarnishing hot rolled ribbed steel bar and production technique thereof, rely on completely and add to solve in prior art naturally cooling technique after hot rolling the mechanical property that reinforced alloys element ensures reinforcing bar, cause reinforcing bar cost of alloy high, irrational problem is controlled to the temperature of rolling, and although hot-rolled reinforced bar rolls the cost of alloy that rear strong Water cooling technique can reduce reinforcing bar, utilize the reinforcing bar of its explained hereafter corrosion rate in an atmosphere and the serious problem of corrosion degree.
For achieving the above object, technical scheme of the present invention is: a kind of resistant to tarnishing hot rolled ribbed steel bar, the chemical composition of Ribbed Bar includes C, Si, Mn, V, Cr, P, S, and wherein the weight percent of chemical composition is: C:0.20%-0.25%, Si:0.40%-0.60%, Mn:0.90%-1.10%, V:0.010%-0.020%, Cr:0.15%-0.25%, P≤0.042%, S≤0.040%, all the other are iron and inevitable impurity.
A production technique for resistant to tarnishing hot rolled ribbed steel bar, is characterized in that: described production technique comprises the following steps:
(1) blast-melted preparation, by weight percentage, describedly blast-meltedly comprises following chemical composition: P≤0.120%, S≤0.070%, Si≤1.20%;
(2) top blown converter is smelted, by weight percentage, described enter the chemical Composition Control of converter molten iron at P≤0.120%, S≤0.060%, Si:0.20%-0.80%, the molten steel tapping temperature after converter smelting and deoxidation alloying is at 1600 DEG C-1660 DEG C, and the ladle chemistry after tapping is: C:0.05%-0.15%, P≤0.025%, S≤0.040%;
(3) LF stove liquid steel refining, refining time is 25-45min, and liquid steel temperature when refining starts is 1535 DEG C-1565 DEG C, and the liquid steel temperature at the end of refining is 1560 DEG C-1590 DEG C;
(4) continuous casting is produced, and continuous casting pouring temperature is 1510 DEG C-1530 DEG C, and the pulling rate of Ribbed Bar in continuous caster is 2.2m/min-3.2 m/min;
(5) Rolling production, billet heating temperature is 1050 DEG C-1100 DEG C, and steel billet tapping temperature is 950 DEG C-1000 DEG C, and start rolling temperature is 900 DEG C-950 DEG C, and finishing temperature is 850 DEG C-900 DEG C;
(6) cooling process, carries out weak Water cooling process after rolling, Ribbed Bar temperature on cooling table is 750 DEG C-800 DEG C.
The invention has the advantages that: after original hot rolled ribbed steel bar rolls strong Water cooling technique basis on, optimize chemical composition, have adjusted C, Si, Mn, the add-on of V alloy element, significantly decrease Mn, the add-on of V alloy element, add a small amount of Cr alloy simultaneously, cost of alloy significantly reduces, by controlling and reducing the temperature in the operation of rolling and process of cooling, reduce the cooling intensity after rolling, both ensure that the mechanical property of Ribbed Bar, turn avoid and roll rear strong Water cooling technique to the destruction of rebar surface ferric oxide cortex, ensure that the stainless property of Ribbed Bar.
Embodiment
Below in conjunction with embodiment and comparative example, the present invention will be further described.
Embodiment 1.
A kind of resistant to tarnishing hot rolled ribbed steel bar, it is characterized in that: the chemical composition of described Ribbed Bar includes C, Si, Mn, V, Cr, P, S, wherein the weight percent of chemical composition is: C:0.23 %, Si:0.50%, Mn:1.00%, V:0.015%, Cr:0.20%, P≤0.042%, S≤0.040%, all the other are iron and inevitable impurity.
The production technique of the resistant to tarnishing hot rolled ribbed steel bar in embodiment 1 comprises the following steps: the preparation that (1) is blast-melted, by weight percentage, blast-meltedly comprises following chemical composition: P≤0.120%, S≤0.070%, Si≤1.20%; (2) top blown converter is smelted, by weight percentage, enter the chemical Composition Control of converter molten iron at P≤0.120%, S≤0.060%, Si:0.50%, the molten steel tapping temperature after converter smelting and deoxidation alloying is at 1630 DEG C, and the ladle chemistry after tapping is: C:0.10%, P≤0.025%, S≤0.040%; (3) LF stove liquid steel refining, refining time is 35min, and liquid steel temperature when refining starts is 1550 DEG C, and the liquid steel temperature at the end of refining is 1575 DEG C; (4) continuous casting is produced, and continuous casting pouring temperature is 1520 DEG C, and the pulling rate of Ribbed Bar in continuous caster is 2.7m/min; (5) Rolling production, billet heating temperature is 1075 DEG C, and steel billet tapping temperature is 975 DEG C, and start rolling temperature is 925 DEG C, and finishing temperature is 875 DEG C; (6) cooling process, carries out weak Water cooling process after rolling, Ribbed Bar temperature on cooling table is 775 DEG C.
Embodiment 2.
A kind of resistant to tarnishing hot rolled ribbed steel bar, it is characterized in that: the chemical composition of described Ribbed Bar includes C, Si, Mn, V, Cr, P, S, wherein the weight percent of chemical composition is: C:0.20%, Si:0.40%, Mn:0.90%, V:0.010%, Cr:0.15%, P≤0.042%, S≤0.040%, all the other are iron and inevitable impurity.
The production technique of the resistant to tarnishing hot rolled ribbed steel bar in embodiment 2 comprises the following steps: the preparation that (1) is blast-melted, by weight percentage, blast-meltedly comprises following chemical composition: P≤0.120%, S≤0.070%, Si≤1.20%; (2) top blown converter is smelted, by weight percentage, enter the chemical Composition Control of converter molten iron at P≤0.120%, S≤0.060%, Si:0.20%, the molten steel tapping temperature after converter smelting and deoxidation alloying is at 1600 DEG C, and the ladle chemistry after tapping is: C:0.05%, P≤0.025%, S≤0.040%; (3) LF stove liquid steel refining, refining time is 25min, and liquid steel temperature when refining starts is 1535 DEG C, and the liquid steel temperature at the end of refining is 1560 DEG C; (4) continuous casting is produced, and continuous casting pouring temperature is 1510 DEG C, and the pulling rate of Ribbed Bar in continuous caster is 2.2m/min; (5) Rolling production, billet heating temperature is 1050 DEG C, and steel billet tapping temperature is 950 DEG C, and start rolling temperature is 900 DEG C, and finishing temperature is 850 DEG C; (6) cooling process, carries out weak Water cooling process after rolling, Ribbed Bar temperature on cooling table is 750 DEG C.
Embodiment 3.
A kind of resistant to tarnishing hot rolled ribbed steel bar, it is characterized in that: the chemical composition of described Ribbed Bar includes C, Si, Mn, V, Cr, P, S, wherein the weight percent of chemical composition is: C:0.25%, Si:0.60%, Mn:1.10%, V:0.020%, Cr:0.25%, P≤0.042%, S≤0.040%, all the other are iron and inevitable impurity.
The production technique of the resistant to tarnishing hot rolled ribbed steel bar in embodiment 3 comprises the following steps: the preparation that (1) is blast-melted, by weight percentage, blast-meltedly comprises following chemical composition: P≤0.120%, S≤0.070%, Si≤1.20%; (2) top blown converter is smelted, by weight percentage, enter the chemical Composition Control of converter molten iron at P≤0.120%, S≤0.060%, Si:0.80%, the molten steel tapping temperature after converter smelting and deoxidation alloying is at 1660 DEG C, and the ladle chemistry after tapping is: C:0.15%, P≤0.025%, S≤0.040%; (3) LF stove liquid steel refining, refining time is 45min, and liquid steel temperature when refining starts is 1565 DEG C, and the liquid steel temperature at the end of refining is 1590 DEG C; (4) continuous casting is produced, and continuous casting pouring temperature is 1530 DEG C, and the pulling rate of Ribbed Bar in continuous caster is 3.2 m/min; (5) Rolling production, billet heating temperature is 1100 DEG C, and steel billet tapping temperature is 1000 DEG C, and start rolling temperature is 950 DEG C, and finishing temperature is 900 DEG C; (6) cooling process, carries out weak Water cooling process after rolling, Ribbed Bar temperature on cooling table is 800 DEG C.
Comparative example 1.
The resistant to tarnishing Ribbed Bar of comparative example 1 and production technique identical with embodiment 1, difference is strong Water cooling technique simulate hot rolling in the operation of rolling and cooling process after, adopt high-temperature final rolling, roll rear strong Water cooling, key process parameter is billet heating temperature is 1160 DEG C, finishing temperature is 1050 DEG C, and Ribbed Bar temperature on cooling table is 720 DEG C.
Comparative example 2.
The resistant to tarnishing Ribbed Bar of comparative example 2 and production technique identical with embodiment 1, difference is in the operation of rolling and cooling process, simulate naturally cooling production technique after traditional hot rolling, adopt high-temperature final rolling, roll rear weak Water cooling, key process parameter is billet heating temperature is 1160 DEG C, finishing temperature is 1050 DEG C, and Ribbed Bar temperature on cooling table is 930 DEG C.
In order to prove the resistant to tarnishing ability of the resistant to tarnishing Ribbed Bar that the present invention produces, the reinforcing bar produced by embodiment 1, comparative example 1 and comparative example 2 does neutral salt spray (NSS) test.First from embodiment 1, the Ribbed Bar that comparative example 1 and comparative example 2 are produced intercepts 3 samples respectively, intercepted length is identical, respectively salt-fog test is done to 3 samples, test solution is NaCl solution, concentration is 50g/L, pH value is 6.9, test period is 24h, 3 samples adopt different finishing temperatures and cooling process, first sample adopts low temperature finish to gauge, roll and weakly wear water afterwards, i.e. embodiment 1 Ribbed Bar of producing, reduce finishing temperature and the cooling intensity of reinforcing bar, effectively ensure that the ferric oxide cortex on Ribbed Bar surface, the resistant to tarnishing ability of Ribbed Bar is remarkable, corrosion area accounts for the sample total area 25%, second sample adopts high-temperature final rolling, rolls to wear water by force afterwards, i.e. comparative example 1 Ribbed Bar of producing, because its cooling intensity is too large, cause the ferric oxide cortex on surface to be destroyed, after finishing salt-fog test, steel bar corrosion is serious, and corrosion area accounts for 90% of the sample total area, 3rd sample adopts traditional naturally cooling technique, high-temperature final rolling, roll and weakly wear water afterwards, i.e. comparative example 2 Ribbed Bar of producing, the resistant to tarnishing ability of resistant to tarnishing ability and first sample is suitable, but its shortcoming production process interalloy add-on is many, causes its production cost to increase, bring unnecessary alloy resource waste to enterprise.From experiment, utilize the Ribbed Bar that production technique of the present invention is produced, not only resistant to tarnishing ability is good, and cost of alloy is low, optimize chemical composition, by controlling and reducing the temperature in the operation of rolling and process of cooling, reduce the cooling intensity after rolling, both ensure that the mechanical property of Ribbed Bar, and turn avoid and roll rear strong Water cooling technique to the destruction of rebar surface ferric oxide cortex, ensure that the stainless property of Ribbed Bar.
Above-described is only preferred embodiments of the present invention; technical scheme of the present invention is not limited thereto; should be understood that to those skilled in the art; under technology enlightenment provided by the present invention; as the common practise of this area; other equivalent modifications and improvement can also be made, also should be considered as protection scope of the present invention.
Claims (2)
1. a resistant to tarnishing hot rolled ribbed steel bar, it is characterized in that: the chemical composition of described Ribbed Bar includes C, Si, Mn, V, Cr, P, S, wherein the weight percent of chemical composition is: C:0.20%-0.25%, Si:0.40%-0.60%, Mn:0.90%-1.10%, V:0.010%-0.020%, Cr:0.15%-0.25%, P≤0.042%, S≤0.040%, all the other are iron and inevitable impurity.
2. a production technique for resistant to tarnishing hot rolled ribbed steel bar, is characterized in that: described production technique comprises the following steps:
(1) blast-melted preparation, by weight percentage, describedly blast-meltedly comprises following chemical composition: P≤0.120%, S≤0.070%, Si≤1.20%;
(2) top blown converter is smelted, by weight percentage, described enter the chemical Composition Control of converter molten iron at P≤0.120%, S≤0.060%, Si:0.20%-0.80%, the molten steel tapping temperature after converter smelting and deoxidation alloying is at 1600 DEG C-1660 DEG C, and the ladle chemistry after tapping is: C:0.05%-0.15%, P≤0.025%, S≤0.040%;
(3) LF stove liquid steel refining, refining time is 25-45min, and liquid steel temperature when refining starts is 1535 DEG C-1565 DEG C, and the liquid steel temperature at the end of refining is 1560 DEG C-1590 DEG C;
(4) continuous casting is produced, and continuous casting pouring temperature is 1510 DEG C-1530 DEG C, and the pulling rate of Ribbed Bar in continuous caster is 2.2m/min-3.2 m/min;
(5) Rolling production, billet heating temperature is 1050 DEG C-1100 DEG C, and steel billet tapping temperature is 950 DEG C-1000 DEG C, and start rolling temperature is 900 DEG C-950 DEG C, and finishing temperature is 850 DEG C-900 DEG C;
(6) cooling process, carries out weak Water cooling process after rolling, Ribbed Bar temperature on cooling table is 750 DEG C-800 DEG C.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105543699A (en) * | 2016-01-20 | 2016-05-04 | 广西丛欣实业有限公司 | Corrosion-resistant reinforcing bar production method |
| CN107574280A (en) * | 2017-08-23 | 2018-01-12 | 山西通才工贸有限公司 | A kind of preparation method of hot rolled ribbed bars |
| CN107604261A (en) * | 2017-07-18 | 2018-01-19 | 河钢股份有限公司承德分公司 | Mark SD345 spirals with ribbing and its production method a kind of day |
| CN109913765A (en) * | 2019-04-29 | 2019-06-21 | 江苏省沙钢钢铁研究院有限公司 | 400 MPa-grade steel bar and manufacturing method thereof |
| CN112375974A (en) * | 2020-10-28 | 2021-02-19 | 南京钢铁股份有限公司 | Deformed steel bar produced by high-chromium molten iron and preparation method thereof |
| CN113930682A (en) * | 2021-10-13 | 2022-01-14 | 四川德胜集团钒钛有限公司 | Method for reducing production cost of anti-seismic reinforcing steel bar |
| CN114042762A (en) * | 2021-09-13 | 2022-02-15 | 阳春新钢铁有限责任公司 | Production method for improving corrosion resistance of deformed steel bar |
| CN114453437A (en) * | 2022-01-20 | 2022-05-10 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Controlled cooling production method of hot-rolled steel bar without martensite ring on surface |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107604261A (en) * | 2017-07-18 | 2018-01-19 | 河钢股份有限公司承德分公司 | Mark SD345 spirals with ribbing and its production method a kind of day |
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| CN109913765A (en) * | 2019-04-29 | 2019-06-21 | 江苏省沙钢钢铁研究院有限公司 | 400 MPa-grade steel bar and manufacturing method thereof |
| CN112375974A (en) * | 2020-10-28 | 2021-02-19 | 南京钢铁股份有限公司 | Deformed steel bar produced by high-chromium molten iron and preparation method thereof |
| CN114042762A (en) * | 2021-09-13 | 2022-02-15 | 阳春新钢铁有限责任公司 | Production method for improving corrosion resistance of deformed steel bar |
| CN114042762B (en) * | 2021-09-13 | 2023-09-26 | 阳春新钢铁有限责任公司 | Production method for improving rust resistance of deformed steel bar |
| CN113930682A (en) * | 2021-10-13 | 2022-01-14 | 四川德胜集团钒钛有限公司 | Method for reducing production cost of anti-seismic reinforcing steel bar |
| CN114453437A (en) * | 2022-01-20 | 2022-05-10 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Controlled cooling production method of hot-rolled steel bar without martensite ring on surface |
| CN114453437B (en) * | 2022-01-20 | 2024-05-24 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Cold-controlled production method for hot-rolled steel bar without martensite ring on surface |
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Application publication date: 20150701 |