CN101869968A - Method for casting thirty-tonnage stainless steel ingot - Google Patents
Method for casting thirty-tonnage stainless steel ingot Download PDFInfo
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- CN101869968A CN101869968A CN201010192377A CN201010192377A CN101869968A CN 101869968 A CN101869968 A CN 101869968A CN 201010192377 A CN201010192377 A CN 201010192377A CN 201010192377 A CN201010192377 A CN 201010192377A CN 101869968 A CN101869968 A CN 101869968A
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Abstract
The invention relates to a method for casting a thirty-tonnage stainless steel ingot, which comprises the following steps: 1, the casting of the head of the steel ingot: firstly, spreading paper scraps with a thickness of 0.8 to 1.2mm on an entire die seat, then overheating a liquid steel to a temperature of 80 to 100 DEG C, opening a ladle sliding nozzle with the width of 45 to 55mm within 5 seconds, and when the liquid steel rises to the height of 220 to 280mm, increasing the rising speed of the liquid steel to be 105 to 125mm/min; 2, the casting of the body of the steel ingot: before the liquid steel rises to a cap line, not adjusting the ladle sliding nozzle; and 3, the casting of the cap line: after the liquid steel rises to the cap line at the height of 50mm, adjusting the sliding nozzle to the width of 10 to 30mm, opening the sliding nozzle to the width of 40 to 65mm when the liquid steel rises to the height of two thirds of the cap line, then breaking off the steel pouring stream 2 to 5 seconds, and opening the sliding nozzle to the width of 40 to 65mm again, carrying out regenerative cycle operation to perform filling for 3 to 6 times, adjusting the sliding nozzle to the width of 10 to 30mm, and then continuing to carry out filling. The stainless steel ingot casted by using the method of the invention has the advantage of eliminating surface defects such as lapping defect, scab, skull patch and residual shrinkage cavity.
Description
Technical field
The present invention relates to a kind of pouring procedure of 30 tonnes of stainless steel ingots, specifically relate to a kind of pouring procedure of 20-35 ton stainless steel ingot.
Background technology
Along with developing rapidly that all trades and professions are produced, be used for forging diameter specifications greater than the above stainless steel forgings of 350mm, and manufacturing thickness specification increases year by year in the demand of slabs such as the above stainless steel structure part of 75mm.Because by compression than the restriction that requires, also do not have can be used for producing the stainless steel casting blank of this type of big gauge material at present, the way of unique solution is to make this blank by pouring into the stainless steel large steel ingot with the large-tonnage ingot mould.
The pouring procedure of existing 20-35 ton stainless steel ingot is when cast, can make that surface of steel ingot lapping defect occurs, scabs, defective such as skull patch and remaining shrinkage cavity, the appearance meeting of these defectives brings problem miscellaneous to rolling process: if surface of steel ingot has the lapping defect defective, can increase the surface of steel ingot reconditioning quality, even on the steel billet of rolling back, layering occur; If surface of steel ingot has scab defects, need to increase than overhaul and grind workload and reconditioning loss, thereby reduced the lumber recovery of steel billet; If surface of steel ingot has skull patch, billet surface can occur ftractureing and large stretch of scabbing during hot-working; Remaining shrinkage cavity can destroy the steel billet continuity, reduces the steel billet lumber recovery, also can declare useless because of the short chi of blank when serious.The pouring procedure of the stainless steel ingot that the present invention relates to can solve stainless steel ingot surface lapping defect, scabs, quality problems such as skull patch and remaining shrinkage cavity.
Summary of the invention
In order to overcome the existing deficiency of 20-35 ton stainless steel ingot on pouring procedure, the invention provides a kind of pouring procedure that can produce the 20-35 ton stainless steel ingot of high-quality steel ingot, stainless steel steel ingot with method of the present invention cast does not have surperficial lapping defect, scabs, skull patch and remaining shrinkage cavity defect.
Design of the present invention is: at 20-35 ton steel ingot issuable quality problems when pouring into a mould, in the operation of 20-35 ton ingot mould casting stainless steel steel ingot, according to day part main operation point difference, implement diverse ways.
The method of this stainless steel 20-35 ton ingot steel casting comprises following sequential steps:
The first step, ingot head cast.
Before the cast, completely spread the ingot mould of cast iron with the thick scraps of paper of 0.8-1.2mm at the bottom of, covering slag is hung and highly is 150-200mm at the bottom of its packaging bag bottom margin mould, superheat of liquid steel is 80-100 ℃.
Open water the back in second that the beam adjustment is steady at 1-3, within 5 seconds, steel ladle sliding water gap is opened to 45-55mm afterwards.When treating that molten steel rises to 220-280mm in the mould, the molten steel rate of climb in the mould is increased to 105-125mm/min.
Second step, the cast of ingot body.
Before rising to cap mouth line to molten steel, no longer adjust the steel ladle sliding water gap opening degree, make that the molten steel rate of climb tends to be steady in the mould.
The 3rd step, the cast of cap mouth.
After molten steel rises to cap mouth line 50mm, adjust steel ladle sliding water gap and carry out filling to 10-30mm; When molten steel rises to cap mouth 2/3 height, steel ladle sliding water gap is opened to 40-65mm, close steel ladle sliding water gap then, interrupt steel stream 2-5 second, steel ladle sliding water gap is opened to 40-65mm, the filling of 3-6 cap mouth is carried out in cycling so back and forth again, adjust steel ladle sliding water gap afterwards and continue filling to 10-30mm, up to being full of the cap mouth.The cap mouth be the duration of pouring ingot body duration of pouring 0.8-1.2 doubly.
With the pouring procedure of this 20-35 ton stainless steel ingot, can solve stainless steel steel ingot surface lapping defect, scab and defectives such as skull patch and remaining shrinkage cavity, thereby reduce surface of steel ingot reconditioning workload and reconditioning loss; Reduce on-the-spot and rolling waste product, further improve recovery rate of iron and steel billet lumber recovery, can create effect more for enterprise.
The specific embodiment
Describe the specific embodiment of the present invention in detail below in conjunction with embodiment, but the specific embodiment of the present invention is not limited to following embodiment.
Embodiment one
Present embodiment ingot shape 22t, a dish, 3 of numbers, 1550 ℃ of pouring temperatures, pour steel amount 69t annotates surplus 5t, and the steel ladle sliding water gap diameter is 65mm, cast steel grade Z2CN19-10NS, its finished product chemical composition (percentage by weight) sees Table-1:
Table-1
| ??C | ??Si | ??Mn | ??P | ??S | ??Cr | ??Ni | ??Cu | ??N |
| ??0.018 | ??0.52 | ??1.20 | ??0.022 | ??0.001 | ??18.61 | ??9.13 | ??0.03 | ??0.066 |
The first step, ingot head cast.
Before the cast, completely spread the ingot mould of cast iron with the thick scraps of paper of 1mm at the bottom of, covering slag is hung and highly is 180mm at the bottom of its packaging bag bottom margin mould, superheat of liquid steel is 95 ℃.
Open water the back with 2 seconds the beam adjustment is steady, with 3 seconds steel ladle sliding water gap is opened to 50mm afterwards.When treating that molten steel rises to 220mm in the mould, the molten steel rate of climb in the mould is increased to 110mm/min.
Second step, the cast of ingot body.
Before rising to cap mouth line to molten steel, no longer adjust the steel ladle sliding water gap opening degree, make that the molten steel rate of climb tends to be steady in the mould.The ingot body notes time is 19min.
The 3rd step, the cast of cap mouth.
After molten steel rises to cap mouth line 50mm, adjust steel ladle sliding water gap and carry out filling to 20mm; When molten steel rises to cap mouth 2/3 height, steel ladle sliding water gap opened to 50mm close then, interrupting the steel stream time is 2 seconds, again steel ladle sliding water gap is opened to 50mm, cycling so back and forth, carried out the filling of 5 cap mouths, adjusted steel ladle sliding water gap afterwards and continue filling to 15mm, up to being full of the cap mouth.The cap mouth notes time is 16min.
Embodiment two
Present embodiment ingot shape 28t, a dish, 2 of numbers, 1575 ℃ of pouring temperatures, pour steel amount 57t annotates surplus 5.1t, and the steel ladle sliding water gap diameter is 65mm, cast steel grade 2Cr13, its finished product chemical composition (percentage by weight) sees Table-2:
Table-2
| ??C | ??Si | ??Mn | ??P | ??S | ??Cr | ??Ni | ??N |
| ??0.19 | ??0.55 | ??0.43 | ??0.021 | ??0.003 | ??12.30 | ??0.06 | ??0.0182 |
The first step, ingot head cast.
Before the cast, completely spread the ingot mould of cast iron with the thick scraps of paper of 1mm at the bottom of, covering slag is hung and highly is 200mm at the bottom of its packaging bag bottom margin mould, superheat of liquid steel is 82 ℃.
Open water the back with 2 seconds the beam adjustment is steady, with 3 seconds steel ladle sliding water gap is opened to 50mm afterwards.When treating that molten steel rises to 220mm in the mould, the molten steel rate of climb in the mould is increased to 110mm/min.
Second step, the cast of ingot body.
Before rising to cap mouth line to molten steel, no longer adjust the steel ladle sliding water gap opening degree, make that the molten steel rate of climb tends to be steady in the mould.The ingot body is 20min when annotating.
The 3rd step, the cast of cap mouth.
After molten steel rises to cap mouth line 50mm, adjust steel ladle sliding water gap and carry out filling to 20mm; When molten steel rises to cap mouth 2/3 height, steel ladle sliding water gap opened to 55mm close then, interrupting the steel stream time is 3 seconds, again steel ladle sliding water gap is opened to 55mm, cycling so back and forth, carried out the filling of 5 cap mouths, adjusted steel ladle sliding water gap afterwards and continue filling to 15mm, up to being full of the cap mouth.The cap mouth is 16min30s when annotating.
Embodiment three
Present embodiment ingot shape 35t, a dish, 2 of numbers, 1546 ℃ of pouring temperatures, pour steel amount 71.5t annotates surplus 6.1t, and the steel ladle sliding water gap diameter is 65mm, cast steel grade OCr18Ni9, its finished product chemical composition (percentage by weight) sees Table-3:
Table-3
| ??C | ??Si | ??Mn | ??P | ??S | ??Cr | ??Ni | ??N |
| ??0.040 | ??0.41 | ??1.27 | ??0.020 | ??0.002 | ??18.29 | ??8.22 | ??0.035 |
The first step, ingot head cast.
Before the cast, completely spread the ingot mould of cast iron with the thick scraps of paper of 1mm at the bottom of, covering slag is hung and highly is 200mm at the bottom of its packaging bag bottom margin mould, superheat of liquid steel is 86 ℃.
Open water the back with 2 seconds the beam adjustment is steady, with 3 seconds steel ladle sliding water gap is opened to 50mm afterwards.When treating that molten steel rises to 260mm in the mould, the molten steel rate of climb in the mould is increased to 110mm/min.
Second step, the cast of ingot body.
Before rising to cap mouth line to molten steel, no longer adjust the steel ladle sliding water gap opening degree, make that the molten steel rate of climb tends to be steady in the mould.The ingot body is 22min45s when annotating.
The 3rd step, the cast of cap mouth.
After molten steel rises to cap mouth line 50mm, adjust steel ladle sliding water gap and carry out filling to 20mm; When molten steel rises to cap mouth 2/3 height, steel ladle sliding water gap opened to 55mm close then, interrupting the steel stream time is 3 seconds, again steel ladle sliding water gap is opened to 55mm, cycling so back and forth, carried out the filling of 6 cap mouths, adjusted steel ladle sliding water gap afterwards and continue filling to 15mm, up to being full of the cap mouth.The cap mouth is 18min35s when annotating.
Claims (1)
1. the pouring procedure of 30 tonnes of stainless steel ingots, it comprises following sequential steps:
The cast of first step ingot head
Before the cast, completely spread the ingot mould of cast iron with the thick scraps of paper of 0.8-1.2mm at the bottom of, covering slag is hung and highly is 150-200mm at the bottom of its packaging bag bottom margin mould, superheat of liquid steel is 80-100 ℃;
Open water the back in second that the beam adjustment is steady at 1-3, within 5 seconds, steel ladle sliding water gap is opened to 45-55mm afterwards; When treating that molten steel rises to 220-280mm in the mould, the molten steel rate of climb in the mould is increased to 105-125mm/min;
The ingot body cast of second step
Before rising to cap mouth line to molten steel, no longer adjust the steel ladle sliding water gap opening degree, make that the molten steel rate of climb tends to be steady in the mould;
The cap mouth cast of the 3rd step
After molten steel rises to cap mouth line 50mm, adjust steel ladle sliding water gap and carry out filling to 10-30mm; When molten steel rises to cap mouth 2/3 height, steel ladle sliding water gap is opened to 40-65mm, close steel ladle sliding water gap then, interrupt steel stream 2-5 second, again steel ladle sliding water gap is opened to 40-65mm, so back and forth cycling, carry out the filling of 3-6 cap mouth, adjust steel ladle sliding water gap afterwards and continue filling to 10-30mm, up to being full of the cap mouth, the cap mouth be the duration of pouring ingot body duration of pouring 0.8-1.2 doubly.
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| CN2010101923773A CN101869968B (en) | 2010-06-01 | 2010-06-01 | Method for casting thirty-tonnage stainless steel ingot |
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| CN2010101923773A CN101869968B (en) | 2010-06-01 | 2010-06-01 | Method for casting thirty-tonnage stainless steel ingot |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102166635A (en) * | 2010-11-26 | 2011-08-31 | 中国科学院金属研究所 | Method for re-pouring and eliminating central contraction cavity and looseness of continuous casting steel ingot through long water gap |
| CN104985143A (en) * | 2015-06-10 | 2015-10-21 | 山西太钢不锈钢股份有限公司 | Mold casting method |
| CN107262685A (en) * | 2017-05-23 | 2017-10-20 | 舞阳钢铁有限责任公司 | 50t is with the die casting method of higher level's Large Flat steel ingot |
| CN109570465A (en) * | 2018-11-30 | 2019-04-05 | 南阳汉冶特钢有限公司 | A method of slab ingot is molded using water-cooled die casting crystallizer production substance 45-55t low-alloy steel |
| CN111168029A (en) * | 2020-01-14 | 2020-05-19 | 邢台钢铁有限责任公司 | Control method for automatic casting of large ladle of continuous casting machine |
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| JP2002224797A (en) * | 2001-02-01 | 2002-08-13 | Sumitomo Metal Ind Ltd | Underfeed ingot-making equipment for molten metal |
| CN101088664A (en) * | 2007-07-17 | 2007-12-19 | 莱芜钢铁集团有限公司 | Continuously casting process of several different-sized steel ingots and casting bogie therefor |
| CN101274356A (en) * | 2008-05-16 | 2008-10-01 | 山西太钢不锈钢股份有限公司 | Dead-melted steel ingot and mold and casting method thereof |
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2010
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Patent Citations (4)
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| JP2002224797A (en) * | 2001-02-01 | 2002-08-13 | Sumitomo Metal Ind Ltd | Underfeed ingot-making equipment for molten metal |
| JP3900836B2 (en) * | 2001-02-01 | 2007-04-04 | 住友金属工業株式会社 | Molten metal pouring and ingot making equipment |
| CN101088664A (en) * | 2007-07-17 | 2007-12-19 | 莱芜钢铁集团有限公司 | Continuously casting process of several different-sized steel ingots and casting bogie therefor |
| CN101274356A (en) * | 2008-05-16 | 2008-10-01 | 山西太钢不锈钢股份有限公司 | Dead-melted steel ingot and mold and casting method thereof |
Non-Patent Citations (1)
| Title |
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| 《大型铸锻件》 19921231 王德耀等 "核电站锻件用大型0Cr18Ni9Ti不锈钢锭的浇注" 37-39 1 , 第4期 2 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102166635A (en) * | 2010-11-26 | 2011-08-31 | 中国科学院金属研究所 | Method for re-pouring and eliminating central contraction cavity and looseness of continuous casting steel ingot through long water gap |
| CN102166635B (en) * | 2010-11-26 | 2013-01-30 | 中国科学院金属研究所 | Method for re-pouring and eliminating central contraction cavity and looseness of continuous casting steel ingot through long water gap |
| CN104985143A (en) * | 2015-06-10 | 2015-10-21 | 山西太钢不锈钢股份有限公司 | Mold casting method |
| CN107262685A (en) * | 2017-05-23 | 2017-10-20 | 舞阳钢铁有限责任公司 | 50t is with the die casting method of higher level's Large Flat steel ingot |
| CN109570465A (en) * | 2018-11-30 | 2019-04-05 | 南阳汉冶特钢有限公司 | A method of slab ingot is molded using water-cooled die casting crystallizer production substance 45-55t low-alloy steel |
| CN109570465B (en) * | 2018-11-30 | 2021-01-05 | 南阳汉冶特钢有限公司 | Method for producing 45-55t low alloy steel slab ingot by using water-cooling die casting crystallizer |
| CN111168029A (en) * | 2020-01-14 | 2020-05-19 | 邢台钢铁有限责任公司 | Control method for automatic casting of large ladle of continuous casting machine |
| CN111168029B (en) * | 2020-01-14 | 2022-04-05 | 邢台钢铁有限责任公司 | Control method for automatic casting of large ladle of continuous casting machine |
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| CN101869968B (en) | 2011-12-28 |
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