CN101993987A - Method for producing extremely thick steel plate with low alloy and high intensity by continuously casting plate blank - Google Patents
Method for producing extremely thick steel plate with low alloy and high intensity by continuously casting plate blank Download PDFInfo
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- CN101993987A CN101993987A CN200910013419XA CN200910013419A CN101993987A CN 101993987 A CN101993987 A CN 101993987A CN 200910013419X A CN200910013419X A CN 200910013419XA CN 200910013419 A CN200910013419 A CN 200910013419A CN 101993987 A CN101993987 A CN 101993987A
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Abstract
The invention relates to a method for producing extremely thick steel plate with low alloy and high intensity by continuously casting plate blank, comprising smelting, continuously casting and rolling; the method is characterized in that the slowly cooling steps which are respectively subsequent to the continuously casting step and the rolling step are provided, and the extremely thick steel plate with low alloy and high intensity is produced by 1) implementing LF refining after smelting within a converter, 2) casting by using a low and stable superheat degree and overall protection, 3) immediately stacking and slowly cooling after removing the casting blank, 4) rolling and 5) entering into a groove and slowly cooling after rolling; wherein the operation of RH vacuum dehydrogenation can be performed in the first step. The production method of the invention can produce an extremely thick steel plate with low alloy and high intensity of 70 to 120 mm thick. The invention has the advantages that the internal quality of extremely thick steel plate with low compression ratio can be improved based on the production process which maintains the common composition design of the steel with low alloy and high intensity and keeps the primary matrix structure, and the qualification rate of the extremely thick steel plate product can be 97% or over according to the ultrasonic inspection of GB/T29701 grade.
Description
Technical field
The present invention relates to metal material field, relate in particular to a kind of method that adopts continuous casting steel billet to produce special thick low-alloy high-strength steel plate.
Background technology
Because industries such as shipbuilding, bridge, boiler, container are more and more higher to the requirement of thick steel plates internal soundness, want to adopt the continuous casting steel billet production technique to occupy the market of thick steel plates, the flaw detection qualification rate that improves low-alloy high-strength steel plate is imperative.
Produce the little problem of 100mm steel plate ubiquity compression ratio owing to adopt continuously cast bloom, the steel plate that present steel-making enterprise is produced the thick guarantor's flaw detection of 100mm adopts mould to annotate large steel ingot to improve compression ratio eliminating or to alleviate the inside steel billet defective more, and the measure of the raising flaw detection qualification rate that it is taked is formulated at large steel ingot inherent solidified structure defective and cleanliness factor two aspects.The measure of the raising flaw detection qualification rate of introduction also is to annotate steel ingot at mould and various technical literatures are as " research of steel plate flaw detection defective ", " improving the technical study of 16MnR steel flaw detection qualification rate ", in " steel plate inspection does not conform to the analysis of causes ", introduce from reduction gas content, minimizing inclusion content aspect in the document " analysis of causes and the discussion of low alloy steel plate of moderate thickness flaw detection defective " and work out measures, though also mentioned the influence of strand cooling in heap and rolling technology to flaw detection, but just initial analysis does not have substantial technology yet.
Discover that the underproof major cause of thick specification hot-rolled flaw detection that causes low-sulfur, hypoxemia is not a non-metallic inclusion, but stress crack, especially crack due to thermal stress.If the steel plate internal stress surpasses the intensity of steel plate heart portion then can produce stress crack, destroy the continuity of substrate of steel plate, cause flaw detection defective, the destruction key that eliminates stress to steel plate especially heart portion is stress relief.
Summary of the invention
The objective of the invention is to develop a kind of method that adopts continuous casting steel billet to produce special thick low-alloy high-strength steel plate, be a kind of employing continuous casting steel billet, the method for the special thick low-alloy high-strength hot-rolled steel sheet that the production internal soundness is good under the condition of small reduction ratio, flaw detection qualification rate is high.
The present invention realizes by the following technical solutions:
Adopt continuous casting steel billet to produce the special thick (method of low-alloy high-strength steel plate of 70mm～120mm), comprise smelting, continuous casting, rolling, it is characterized in that, be provided with the slow cooling operation at continuous casting working procedure and rolling process back respectively, and, be described below according to following steps production:
1) pushing off the slag tapping after the converter melting, thickness of slag layer≤100mm through the processing of skimming, carries out the LF refining again, the quiet argon blowing time of ladle 5～10 minutes;
2) adopt low, stable superheating temperature whole process protection cast, 20 ± 5 ℃ of superheating temperature, teeming temperature are 1528～1538 ℃, and drop into induction stirring, stir current intensity is 1000A, the constant speed cast, pouring speed is 0.8～0.85m/min;
3) the strand stacking slow cooling at once that rolls off the production line is put two hot bases on the buttress top, insulation on every side, 28～48 hours slow cooling time, casting machine ordering parameter;
4) rolling, 1050～1250 ℃ of start rolling temperatures, rate of heating 10～15min/cm, rolling pass draught 15～18%, finishing temperature is 800～920 ℃;
5) rolling laggard groove slow cooling, advancing the groove temperature is 300 ℃～420 ℃, 16～24 hours slow cooling time, goes out 180～250 ℃ of groove temperature.
Described employing continuous casting steel billet is produced the method for special thick low-alloy high-strength steel plate, it is characterized in that, described step 1) can add the RH vacuum dehydrogenation to be handled, and cycling time, 10～20min handled back free oxygen content [O]≤15ppm, hydrogen richness [H]≤3ppm.
The chemical component weight per-cent of described steel plate is: C 0.15～0.20%, and Si 0.30～0.40%, and Mn 1.4～1.6%, P≤0.015%, and Nb≤0.05%, V≤0.1%, Ceq0.39～0.49%, S≤0.01%, all the other are iron Fe.
Described manufacture method can be produced the special thick low-alloy high-strength steel plate of 70mm～120mm.
Compared with prior art, the invention has the beneficial effects as follows: on the production technique basis that does not change the design of Hi-Stren steel conventional ingredient and original matrix, improve small reduction ratio super-thick steel plate internal soundness, can reach more than 97% by GB/T2970I level ultrasonic flaw detection qualification rate.
Embodiment
The present invention will be further described below in conjunction with embodiment.
The method that adopts continuous casting steel billet to produce special thick low-alloy high-strength steel plate comprises smelting, continuous casting, rolling, is provided with the slow cooling operation at continuous casting working procedure and rolling process back respectively, and according to following steps production, is described below:
1) pushing off the slag tapping after the converter melting, thickness of slag layer≤100mm through the processing of skimming, carries out the LF refining again, the quiet argon blowing time of ladle 5～10 minutes;
2) adopt low, stable superheating temperature whole process protection cast, 20 ± 5 ℃ of superheating temperature, teeming temperature are 1528～1538 ℃, and drop into induction stirring, stir current intensity is 1000A, the constant speed cast, pouring speed is 0.8～0.85m/min;
3) the strand stacking slow cooling at once that rolls off the production line is put two hot bases on the buttress top, insulation on every side, 28～48 hours slow cooling time, casting machine ordering parameter;
4) rolling, start rolling temperature＞1050～1250 ℃, rate of heating 〉=10～15min/cm, rolling pass draught 15～18%, finishing temperature is 800～920 ℃; Rate of heating is to define the heat-up time of every centimetre of steel billet.
5) rolling laggard groove slow cooling, advancing the groove temperature is 300 ℃～420 ℃, 16～24 hours slow cooling time, goes out 180～250 ℃ of groove temperature.
Above-mentioned steps 1) can add the RH vacuum dehydrogenation and handle, cycling time, 10～20min handled back free oxygen content [O]≤15ppm, hydrogen richness [H]≤3ppm.
The chemical component weight per-cent of this steel plate is: C 0.15～0.20%, and Si 0.30～0.40%, and Mn 1.4～1.6%, P≤0.015%, and Nb≤0.05%, V≤0.1%, Ceq0.39～0.49%, S≤0.01%, all the other are iron Fe.
This manufacture method can produce 70mm～120mm by the qualified special thick low-alloy high-strength steel plate of GB/T2970I level flaw detection.
Embodiment: produce thickness of slab 100mm low-alloy high-strength steel plate.
1) smelt high cleanliness molten steel---molten steel carries out the LF refining behind converter smelting, fully go to be mingled with, desulfurization, carry out the RH vacuum-treat again, vacuum tightness 0.3～0.8 torr, further degass, goes to be mingled with at 10 minutes hold-times, guarantee [the O]≤15ppm of molten steel, [H]≤3ppm, the chemical component weight per-cent of molten steel must satisfy the low-alloy high-strength steel plate standard-required, C0.15～0.20%, Si 0.30～0.40%, Mn 1.4～1.6%, P≤0.015%, Nb≤0.05%, V≤0.1%, Ceq0.39～0.49%, S≤0.010%, all the other are iron Fe.Carbon content and carbon equivalent will be controlled at C≤0.20% in the smelting process, in the standard-required scope of carbon equivalent: Ceq≤0.49%, as the need oxygen blast that exceeds standard, until surplus carbon is burnt, after chemical composition analysis is qualified, converter pushing off the slag tapping, thickness of slag layer≤100mm, and to carry out the molten steel processing of skimming after the tapping;
2) continuous casting---whole process using protection cast, the vacuum tightness during vacuum pouring remains on 0.3～0.8 torr.Molten steel jar, tundish, long nozzle and submerged nozzle will be cleaned out, and baking is dry, and reducing casting process may be to the pollution of molten steel, and tundish target superheating temperature is by 20 ℃ of controls, and drop into induction stirring, adopt constant speed cast, continuous casting steel billet thickness 300mm;
3) the strand stacking slow cooling at once that rolls off the production line is put two hot bases on the buttress top, insulation on every side, 36～40 hours slow cooling time, casting machine ordering parameter; Stop the mechanical crackle that causes because of casting machine;
4) blank is rolled into steel plate---the heating cycle that high temperature burns slowly of required thickness, rate of heating is every centimetre of thickness heating of steel billet 11 minutes, rolling pass draught 15%, start rolling temperature is 1200 ℃, finishing temperature is 880 ℃, blank is rolled into 100 * (2000～2100) * L steel plate, and terminal trims;
5) roll the back steel plate and all will advance the groove slow cooling, and a hot steel plate " lid quilt " that size is suitable must be arranged on it.Steel plate advances the groove temperature and wants 350～420 ℃, in groove time＞16 hour.If time is up but temperature still is higher than 250 ℃ in slow cooling, steel plate goes out will continue behind the groove stacking＞20 hour; By GB/T2970-2004 quality grade I level steel plate is carried out ultrasonic testing;
6) plate quality test and analysis:
1. embodiment steel plate rolling technique parameter sees Table 1;
2. mechanical properties test the results are shown in Table 2.
Table 1 embodiment steel plate rolling technique parameter
Table 2 low-alloy high-strength steel plate mechanical property
Annotate: the Akv test temperature is-20 ℃.
2. carbon content and carbon equivalent:
Carbon content: C≤0.20%;
Carbon equivalent: Ceq≤0.49%;
3. UT (Ultrasonic Testing): it is qualified that steel plate carries out UT (Ultrasonic Testing), and standard is the I level for the GB/T2970 quality grade.
4. steel plate shape and dimensional requirement:
Width tolerance: 0～1%; Length tolerance: 0～20mm; Thickness deviation: 0～4%.
The wave degree of steel plate :≤± 5mm/1000mm
The vertical combined deflection tolerance of steel plate :≤15mm.
Claims (4)
1. the method that adopts continuous casting steel billet to produce special thick low-alloy high-strength steel plate comprises smelting, continuous casting, rolling, it is characterized in that, is provided with the slow cooling operation at continuous casting working procedure and rolling process back respectively, and according to following steps production, is described below:
1) pushing off the slag tapping after the converter melting, thickness of slag layer≤100mm through the processing of skimming, carries out the LF refining again, the quiet argon blowing time of ladle 5～10 minutes;
2) adopt low, stable superheating temperature whole process protection cast, 20 ± 5 ℃ of superheating temperature, teeming temperature are 1528～1538 ℃, and drop into induction stirring, stir current intensity is 1000A, the constant speed cast, pouring speed is 0.8～0.85m/min;
3) the strand stacking slow cooling at once that rolls off the production line is put two hot bases on the buttress top, insulation on every side, 28～48 hours slow cooling time, casting machine ordering parameter;
4) rolling, 1050～1250 ℃ of start rolling temperatures, rate of heating 10～15min/cm, rolling pass draught 15～18%, finishing temperature is 800～920 ℃;
5) rolling laggard groove slow cooling, advancing the groove temperature is 300 ℃～420 ℃, 16～24 hours slow cooling time, goes out 180～250 ℃ of groove temperature.
2. employing continuous casting steel billet according to claim 1 is produced the method for special thick low-alloy high-strength steel plate, it is characterized in that described step 1) can add the RH vacuum dehydrogenation to be handled, cycling time 10～20min, handle back free oxygen content [O]≤15ppm, hydrogen richness [H]≤3ppm.
3. employing continuous casting steel billet according to claim 1 and 2 is produced the method for special thick low-alloy high-strength steel plate, it is characterized in that, the chemical component weight per-cent of described steel plate is: C 0.15～0.20%, and Si 0.30～0.40%, and Mn 1.4～1.6%, P≤0.015%, Nb≤0.05%, V≤0.1%, Ceq0.39～0.49%, S≤0.01%, all the other are iron Fe.
4. the method for producing special thick low-alloy high-strength steel plate according to each described employing continuous casting steel billet in the claim 1 to 3 is characterized in that, described manufacture method can be produced the special thick low-alloy high-strength steel plate of 70mm～120mm.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102517428A (en) * | 2011-12-23 | 2012-06-27 | 秦皇岛首秦金属材料有限公司 | Method for producing low compression ratio crack detection thick plate |
| CN102676953A (en) * | 2012-06-13 | 2012-09-19 | 鞍钢股份有限公司 | 47kg grade steel plate used on ocean engineering platform and production method thereof |
| CN103074466A (en) * | 2013-01-05 | 2013-05-01 | 河北钢铁股份有限公司邯郸分公司 | Low-cost steel-making process for manufacturing flaw detection plate |
| CN103160666A (en) * | 2011-12-14 | 2013-06-19 | 鞍钢股份有限公司 | Method for manufacturing of low-cost super-thick steel plate by short process |
| CN104651716A (en) * | 2015-02-09 | 2015-05-27 | 宝钢集团新疆八一钢铁有限公司 | Production method of low-alloy Q460C steel plate |
| CN107475629A (en) * | 2017-07-11 | 2017-12-15 | 舞阳钢铁有限责任公司 | 36 feather weight resist big aircraft impact high-elongation nuclear power steel plate and its production method |
| CN111299533A (en) * | 2020-04-03 | 2020-06-19 | 武汉钢铁有限公司 | Method for improving castability of ultra-low carbon steel produced by billet continuous casting machine |
| CN115125367A (en) * | 2022-06-20 | 2022-09-30 | 河北普阳钢铁有限公司 | Production method for reducing H content in bridge steel without vacuum refining |
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| CN101419139B (en) * | 2008-05-06 | 2010-12-01 | 首钢总公司 | Method for preventing steel plate special for flaw detection from generating hydrogen induced cracking |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103160666A (en) * | 2011-12-14 | 2013-06-19 | 鞍钢股份有限公司 | Method for manufacturing of low-cost super-thick steel plate by short process |
| CN102517428A (en) * | 2011-12-23 | 2012-06-27 | 秦皇岛首秦金属材料有限公司 | Method for producing low compression ratio crack detection thick plate |
| CN102517428B (en) * | 2011-12-23 | 2013-11-27 | 秦皇岛首秦金属材料有限公司 | Method for producing low compression ratio crack detection thick plate |
| CN102676953A (en) * | 2012-06-13 | 2012-09-19 | 鞍钢股份有限公司 | 47kg grade steel plate used on ocean engineering platform and production method thereof |
| CN103074466A (en) * | 2013-01-05 | 2013-05-01 | 河北钢铁股份有限公司邯郸分公司 | Low-cost steel-making process for manufacturing flaw detection plate |
| CN103074466B (en) * | 2013-01-05 | 2014-07-02 | 河北钢铁股份有限公司邯郸分公司 | Low-cost steel-making process for manufacturing flaw detection plate |
| CN104651716A (en) * | 2015-02-09 | 2015-05-27 | 宝钢集团新疆八一钢铁有限公司 | Production method of low-alloy Q460C steel plate |
| CN107475629A (en) * | 2017-07-11 | 2017-12-15 | 舞阳钢铁有限责任公司 | 36 feather weight resist big aircraft impact high-elongation nuclear power steel plate and its production method |
| CN111299533A (en) * | 2020-04-03 | 2020-06-19 | 武汉钢铁有限公司 | Method for improving castability of ultra-low carbon steel produced by billet continuous casting machine |
| CN115125367A (en) * | 2022-06-20 | 2022-09-30 | 河北普阳钢铁有限公司 | Production method for reducing H content in bridge steel without vacuum refining |
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