CN102345050A - Method for producing flaw detection and performance guaranteed Q235B steel plate with 80-100mm in argon station - Google Patents
Method for producing flaw detection and performance guaranteed Q235B steel plate with 80-100mm in argon station Download PDFInfo
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- CN102345050A CN102345050A CN2011101905074A CN201110190507A CN102345050A CN 102345050 A CN102345050 A CN 102345050A CN 2011101905074 A CN2011101905074 A CN 2011101905074A CN 201110190507 A CN201110190507 A CN 201110190507A CN 102345050 A CN102345050 A CN 102345050A
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Abstract
The invention discloses a method for producing a flaw detection and performance guaranteed Q235B steel plate with 80-100mm employing argon station steel. The produced steel plate of the specification comprises chemical components of 0.10-0.19% of C, 0.15-0.30% of Si, 0.50-0.80% of Mn, P no more than 0.023%, S no more than 0.015%, Als no more than 0.020% and N no more than 0.005%. The invention employs a 250mm continuous casting billet; and a production process flow comprises steps of: molten iron desulphurization, treatment in 120t top-bottom combined blown converter, continuous casting, casting blank insulation and slow cooling, rolled steel plate stack cooling, finishing, examination and warehouse entering. Compared with a prior art, the invention employs argon station steel to produce flaw detection guaranteed steel plate, cancels a routine LF refining production, shortens a production flow and reduces costs per ton of steel; meanwhile, a 250mm thickness section is adopted in the production to increase production rhythm and substantially reduce production costs, compared with a routine section thicker than 250mm or mold ingot.
Description
Technical field
The present invention relates to a kind of take steel production Q235B 80-100mm specification guarantor flaw detection, guaranteed cost steel plate working method on the argon station, be applicable to that domestic medium and small sized enterprises produce use under the condition of no refining means.
Background technology
Along with rolled steel market increases zero defect steel plate demand day by day, the Q235B thick steel plates of protecting flaw detection, guaranteed cost becomes the accent product that existing market is sold.But at present; Domestic steel mill generally takes LF refining or LF refining to add the vacuum production technique when producing the thick specification 80-100mm steel plate of this steel grade to produce; And the casting blank section that uses is the blank of rolling specs compression ratio＞3, and its Production Flow Chart is long, production cost is high, and quality is unstable.Hinder for solving the Production Flow Chart of producing straight carbon steel 80-100mm specification guarantor flaw detection, the existence of guaranteed cost steel plate, take converter to add argon station technology and produce, can effectively solve the problem of present existence.
Summary of the invention
In line with shortening the technological process of production; Reduce ton steel production cost; The contriver takes continuously cast bloom to produce Q235B 80-100mm guaranteed cost, protects the flaw detection steel plate; And follow-up plate property, result of detection followed the tracks of; To subsequent result; Continue to optimize production technique, formed the complete continuously cast bloom of a cover and produced Q235B 80-100mm specification guaranteed cost, protect flaw detection steel plate working method.This method can solve tradition when taking LF refining or LF refining to add vacuum to produce long flow path, long drawback of cycle, and can reduce production costs significantly.Simultaneously; Design of fiting chemical composition and strand, steel plate insulation slow cooling measure; Make the 80-100mm specification steel plate of final production have the good mechanical performance, and flaw detection internal soundness rank reaches one-level, secondary, three grades of levels that GB requires, satisfied customer demand greatly.
For reaching above-mentioned requirements; The technical scheme that the present invention takes is the said steel plate method that Q235B 80-100mm specification is protected flaw detection, guaranteed cost of producing at the argon station; This Q235B 80-100mm specification is protected flaw detection steel plate chemical ingredients: C:0.10～0.19%; Si:0.15～0.30%; Mn:0.50～0.80%, P≤0.023%, S≤0.015%; Als≤0.020%, N≤0.005%; All the other are Fe and unavoidable impurities;
The present invention takes continuously cast bloom production, and its production technique is: the converter molten iron is taked desulfurized molten iron, molten iron S content≤0.003%; Converter is taked to push up the end and is reproduced smelting, tapping C>=0.08%; The ladle refining slag slag making is taked at the argon station, and prolongs argon blowing time>=12min; Continuous casting is taked the low pulling rate cast of 0.70m/min, and middle Baogang water superheating temperature is controlled at 15 ± 5 ℃; Take stay-warm case insulation slow cooling＞48h after the strand cutting; Take haybox cooking slow cooling＞48h behind the steel plate rolling.
In the preceding method, described thickness of strand is 250mm.
The present invention is in existing Q235B 80-100mm steel plate production process, suitably increases carbon, manganese content, and is qualified to guarantee performance; Then, the harmful element P that keeps under strict control, S, N content take strand and steel plate insulation slow cooling＞48h measure to guarantee the steel plate inspection quality simultaneously.Thereby effectively guarantee rolled sheet material performance and flaw detection qualification rate requirement.
Beneficial effect of the present invention is: take steel production guarantor flaw detection steel plate on the argon station, cancelled conventional LF refining and produced, shortened Production Flow Chart and reduced ton steel cost; Take the production of 250mm thickness section simultaneously, take thickness＞250mm section or ingot casting production to compare, improved rhythm of production, greatly reduce production cost with routine.
Embodiment
Steel plate method of producing Q235B 80-100mm specification guarantor flaw detection, guaranteed cost at the argon station according to the invention; This Q235B 80-100mm specification is protected flaw detection steel plate chemical ingredients: C:0.10～0.19%; Si:0.15～0.30%; Mn:0.50～0.80%; P≤0.023%; S≤0.015%, Als≤0.020%, N≤0.005%; All the other are Fe and unavoidable impurities; Its working method is taked desulfurized molten iron for the converter molten iron, molten iron S content≤0.003%; Converter is taked to push up the end and is reproduced smelting, tapping C>=0.08%; The ladle refining slag slag making is taked at the argon station, and prolongs argon blowing time>=12min; Continuously cast bloom is taked the low pulling rate cast of 0.70m/min, and middle Baogang water superheating temperature is controlled at 15 ± 5 ℃; Take stay-warm case insulation slow cooling＞48h after the strand cutting; Take haybox cooking slow cooling＞48h behind the steel plate rolling.
1, chemical Composition Control
C:0.10～0.19%, Si:0.15～0.30%, Mn:0.50～0.80%, P≤0.023%, S≤0.015%, Als≤0.020%, N≤0.005%; All the other are Fe and unavoidable impurities.
2, technological process of production control
Be incubated cooling in heap → finishing → check → warehouse-in behind desulfurizing iron → 120t top and bottom combined blown converter → argon station ar blowing refining → continuous casting → strand insulation slow cooling → steel plate rolling
3, desulfurizing iron: before the molten iron that arrives at a station must be taken off slag with take off the back slag, guarantee liquid level thickness of slag layer≤20mm, molten iron guarantees molten iron S≤0.003% after the KR stirring desulphurization, the desulfurization cycle is pressed≤20 ℃ of controls by≤21min control, desulfurization temperature drop;
4,120t top and bottom combined blown converter: go into stove molten iron S≤0.003%, molten iron temperature>=1250 ℃, converter metal Intake Quantity error is by ± 1t control, and slag making basicity press 2.8-3.2 and is controlled; Tapping target: C>=0.08%, P≤0.018%, S≤0.014%; Tapping process is taked slag stop cone pushing off the slag tapping, guarantees that down the slag gauge control is in≤30mm; Tapping process is taked omnidistance Argon.
5, argon station ar blowing refining: molten steel adds earlier aluminum steel in ladle behind the argon station, and add-on is pressed the control of 2m/t steel, and aluminum steel adds the back and in ladle, adds ladle refining slag 2.5Kg/t steel, lime 50Kg, calcium carbide 30Kg; After adding finishes; Transfer big argon gas amount to carry out strong Argon (strong Argon standard is controlled at 400-600mm and is as the criterion to blow molten steel bore hole diameter summation open), treat to turn down behind the strong Argon 6min argon gas and carry out soft blow argon (soft blow argon standard is controlled at 200-300mm and is as the criterion to blow molten steel bore hole diameter summation open); After treating the total argon blowing time >=12min in argon station, close argon gas after temperature reaches 1575-1585 ℃ and add continuous-casting steel pouring on the insulating covering agent;
6, continuous casting: continuous casting is taked the low pulling rate cast of 0.70m/min, and middle Baogang water superheating temperature is controlled at 15 ± 5 ℃; Carry out the big Zhong Bao of bag simultaneously, middlely wrap crystallizer whole process protection cast; The mold liquid level of keeping under strict control is stable, prevents liquid fluctuating volume slag;
7, strand insulation slow cooling: take stay-warm case insulation slow cooling＞48h after the strand cutting; Require stay-warm case to wrap up strand fully, avoid strand exposed earlier to generation;
8, be incubated cooling in heap behind the steel plate rolling: necessary cooling in heap fast after steel plate rolling rolls off the production line, cooling in heap requires in insulation can, to carry out cooling in heap time＞48h.
After rolling according to the strand of this explained hereafter, carry out mechanical property and carrying out flaw detection, detected result is seen shown in table 1, the table 2 respectively.
Table 1 mechanical property detected result
Table 2 carrying out flaw detection result
| Lot number | Specification mm | Result of detection |
| 1 | 85 | The unification level |
| 2 | 100 | Close three grades |
| 3 | 80 | Close secondary |
| 4 | 90 | Close secondary |
| 5 | 90 | Close three grades |
| 6 | 90 | Close three grades |
| 7 | 90 | Close three grades |
| 8 | 80 | Close three grades |
| 9 | 80 | Close three grades |
| 10 | 80 | Close three grades |
| 11 | 80 | Close three grades |
| 12 | 80 | Close secondary |
| 13 | 80 | The unification level |
| 14 | 80 | Close three grades |
Test-results shows: the steel plate that this invention is produced has good plasticity and toughness requirement, and the rolled sheet material flaw detection meets GB flaw detection requirement fully.
Production Flow Chart was long when patent of the present invention had overcome traditional mode of production, production cost is high, and the unsettled phenomenon of quality is applicable to that domestic medium and small sized enterprises produce use under the condition of no refining means.
Claims (2)
1. produce the steel plate method that Q235B 80-100mm specification is protected flaw detection, guaranteed cost at the argon station for one kind; This Q235B 80-100mm specification is protected flaw detection steel plate chemical ingredients: C:0.10～0.19%; Si:0.15～0.30%; Mn:0.50～0.80%; P≤0.023%; S≤0.015%, Als≤0.020%, N≤0.005%; All the other are Fe and unavoidable impurities; It is characterized in that: this working method is taked desulfurized molten iron for the converter molten iron, molten iron S content≤0.003%; Converter is taked to push up the end and is reproduced smelting, tapping C>=0.08%; The ladle refining slag slag making is taked at the argon station, and prolongs argon blowing time>=12min; Continuously cast bloom is taked the low pulling rate cast of 0.70m/min, and middle Baogang water superheating temperature is controlled at 15 ± 5 ℃; Take stay-warm case insulation slow cooling＞48h after the strand cutting; Take haybox cooking slow cooling＞48h behind the steel plate rolling.
2. according to the said steel plate method of producing Q235B 80-100mm specification guarantor flaw detection, guaranteed cost at the argon station of claim 1, it is characterized in that described thickness of strand is 250mm.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102586546A (en) * | 2012-03-05 | 2012-07-18 | 吉林建龙钢铁有限责任公司 | Process for preparing low-carbon low-silicon-aluminium killed steel |
| CN103911544A (en) * | 2014-04-23 | 2014-07-09 | 武汉钢铁(集团)公司 | Low alloy structural steel with low cost and thick specification and production method thereof |
| CN104611626A (en) * | 2013-11-05 | 2015-05-13 | 上海梅山钢铁股份有限公司 | Low-cost high-strength automobile wheel steel and production method thereof |
| CN108676964A (en) * | 2018-05-30 | 2018-10-19 | 舞阳钢铁有限责任公司 | A kind of production method of the micro- refining of Q235B grades of steel |
| CN113832299A (en) * | 2021-10-29 | 2021-12-24 | 吉林建龙钢铁有限责任公司 | Preparation process of Q235B steel |
| CN114540713A (en) * | 2022-03-01 | 2022-05-27 | 新疆八一钢铁股份有限公司 | Production method of Q235KZ anti-seismic section steel |
| CN114574776A (en) * | 2022-03-21 | 2022-06-03 | 广西柳州钢铁集团有限公司 | Method for producing weather-resistant Q235NHB middle plate by double-stand rolling mill and Q235NHB middle plate |
| CN115074486A (en) * | 2022-07-11 | 2022-09-20 | 河北普阳钢铁有限公司 | External refining and slagging method for converter steelmaking |
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| CN102041350A (en) * | 2010-12-21 | 2011-05-04 | 南阳汉冶特钢有限公司 | Method for improving purity of molten steel in argon station |
| CN102041431A (en) * | 2010-12-21 | 2011-05-04 | 南阳汉冶特钢有限公司 | Q345B protected flaw detection steel plate and production method thereof |
| CN102080184A (en) * | 2010-12-21 | 2011-06-01 | 南阳汉冶特钢有限公司 | 75-mm Z15 series steel plate prepared by rolling 250-mm casting blank and production method of 75-mm Z15 series steel plate |
| CN102094148A (en) * | 2010-12-22 | 2011-06-15 | 南阳汉冶特钢有限公司 | Q460D steel for low-alloy high-strength structure of below 50mm and production method thereof |
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2011
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| CN102041350A (en) * | 2010-12-21 | 2011-05-04 | 南阳汉冶特钢有限公司 | Method for improving purity of molten steel in argon station |
| CN102041431A (en) * | 2010-12-21 | 2011-05-04 | 南阳汉冶特钢有限公司 | Q345B protected flaw detection steel plate and production method thereof |
| CN102080184A (en) * | 2010-12-21 | 2011-06-01 | 南阳汉冶特钢有限公司 | 75-mm Z15 series steel plate prepared by rolling 250-mm casting blank and production method of 75-mm Z15 series steel plate |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102586546A (en) * | 2012-03-05 | 2012-07-18 | 吉林建龙钢铁有限责任公司 | Process for preparing low-carbon low-silicon-aluminium killed steel |
| CN104611626A (en) * | 2013-11-05 | 2015-05-13 | 上海梅山钢铁股份有限公司 | Low-cost high-strength automobile wheel steel and production method thereof |
| CN103911544A (en) * | 2014-04-23 | 2014-07-09 | 武汉钢铁(集团)公司 | Low alloy structural steel with low cost and thick specification and production method thereof |
| CN103911544B (en) * | 2014-04-23 | 2016-03-30 | 武汉钢铁(集团)公司 | Low cost thick specification low-alloy structure and production method thereof |
| CN108676964A (en) * | 2018-05-30 | 2018-10-19 | 舞阳钢铁有限责任公司 | A kind of production method of the micro- refining of Q235B grades of steel |
| CN113832299A (en) * | 2021-10-29 | 2021-12-24 | 吉林建龙钢铁有限责任公司 | Preparation process of Q235B steel |
| CN114540713A (en) * | 2022-03-01 | 2022-05-27 | 新疆八一钢铁股份有限公司 | Production method of Q235KZ anti-seismic section steel |
| CN114540713B (en) * | 2022-03-01 | 2023-03-14 | 新疆八一钢铁股份有限公司 | Production method of Q235KZ anti-seismic section steel |
| CN114574776A (en) * | 2022-03-21 | 2022-06-03 | 广西柳州钢铁集团有限公司 | Method for producing weather-resistant Q235NHB middle plate by double-stand rolling mill and Q235NHB middle plate |
| CN115074486A (en) * | 2022-07-11 | 2022-09-20 | 河北普阳钢铁有限公司 | External refining and slagging method for converter steelmaking |
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Application publication date: 20120208 |