CN101733619A - Production technology of large round steel - Google Patents
Production technology of large round steel Download PDFInfo
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- CN101733619A CN101733619A CN200810159861A CN200810159861A CN101733619A CN 101733619 A CN101733619 A CN 101733619A CN 200810159861 A CN200810159861 A CN 200810159861A CN 200810159861 A CN200810159861 A CN 200810159861A CN 101733619 A CN101733619 A CN 101733619A
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Abstract
The invention relates to a production technology of large round steel, comprising the following steps of: continuously casting qualified steel as a raw material to obtain an arc rectangular square billet, and then heating, removing scale, roughly rolling, finely rolling, cooling and finishing to accomplish the production process, wherein the cross section of the arc rectangular square billet has the shape that the radii of four corners are 20%-40% of the thickness of the continuous casting billet. Compared with the prior art, the production technology has the advantages that compared with the technology for producing the large round steel by using continuous casting large square billet, the production technology has good steel quality, less rolling pass and low energy consumption; and compared with the technology for producing the large round steel by using continuous casting round billet, the production technology can not generate steel reversion in the rough rolling process and has simple rolling process, low rolling waste rate, high rate of finished products and cost reduction.
Description
Affiliated technical field
The present invention relates to a kind of production technology of large circular steel, belong to the steel production technical field.
Background technology
Large circular steel typically refers to the round steel of diameter 〉=80mm, it is a kind of steel that are widely used in machine building industry, and according to the blank classification of using, existing production technology has 3 classes: one is to use static ingot, two are to use continuous casting blooms, and three are to use continuous cast round billets.
When using static ingot to produce large circular steel, at first to use the blooming mill cogging after the steel ingot heating, the cutting head cutting tail loss is about 10～20%, cause finished product rate lower, be approximately about 80%, and the energy consumption height, according to statistics, high 627～the 1046kJ of energy consumption per ton steel is equivalent to 21.4～35.7kg standard coal.Add the low influence of finished product rate, by China's energy consumption level measuring and calculating, the high about 130kg standard coal of ton steel comprehensive energy consumption when using static ingot to produce large circular steel.So except the minority kind, the technology of using static ingot to produce large circular steel is eliminated.
The technology of using continuous casting blooms to produce large circular steel is present most widely used a kind of technology.With use steel ingot to produce large circular steel technology to compare, it is about about 10% that finished product rate improves, a ton steel comprehensive energy consumption reduces about about 130kg standard coal.But the technology of using continuous casting blooms to produce large circular steel exists a main defective to be, because the cross section of strand is square or rectangle, its crystallizer section also is an approximate square or approximate rectangular, so, in crystallizer, just formed 4 90 ° bight, at the crystallizer folding corner region, owing to be Two-Dimensional Heat, intensity of cooling is big, and the base shell solidifies the fastest, shrink the earliest, air gap at first forms, and heat transfer is slowed down, and solidifies also and slows down.Along with the base shell moves down, air gap expands to the middle part from the bight, because the ferrostatic pressure effect, crystallizer middle part air gap is littler than the bight, so bight base shell is the thinnest, is the sensitive part that cracks with bleedout, and the cross section of square billet is big more, and this problem is serious more.On the other hand,, more help the growth of column crystal because big in crystallizer folding corner region intensity of cooling, generally speaking, equiax crystal compact structure, good processability; And column crystal has tangible directionality owing to its crystal, poor processability, and the influence owing in crystallizer folding corner region Two-Dimensional Heat causes column crystal ratio height, the proportion of equiaxed grain of bloom low.And defectives such as crackle appear in bight easily, cause the generation of steel rolling waste product.In order to remedy the deficiency of steel billet, only when rolling, increase percentage elongation, cause energy consumption rising, productivity ratio to reduce, cost increases.
In view of using continuous casting blooms to produce the defective that technology had of large circular steel, the technology of continuous cast round billets production large circular steel has been used in exploitation.Round mold does not have the strong cold and premature set in bight, compares with continuous casting square billet, and setting rate is more even, so under the situation of the identical steel grade of cast, the column crystal ratio of continuous cast round billets is less, and the proportion of equiaxed grain height, and do not have the bight crackle.Can reduce percentage elongation when rolling, energy consumption reduction, productivity ratio are improved, cost reduces.
Use continuous cast round billets to produce the major defect of large circular steel technology:
No matter base or square billet are justified in use, and after steel billet entered the rolling several passages of roughing mill, rolled piece need be overturn 90 ° was rolled again.Do not have what problem when using square billet, still, the circle base after the rolling several passages of roughing mill, shape as shown in Figure 3, both sides are circular arc, after 90 ° of rolled piece upsets, as shown in Figure 4, upper and lower surface is a circular arc, can't stand on roller-way firmly.Have only the manipulator of use that it is clamped, but still unstable when nipping roll, steel often takes place, cause rolling useless.
Summary of the invention
The production technology that the purpose of this invention is to provide a kind of large circular steel can be avoided the defective of prior art, improves the quality of production of large circular steel, reduces consuming and cost.
The technical scheme of the production technology of the said a kind of large circular steel of the present invention is such, qualified molten steel is at first cast continuous casting billet through conticaster, continuous casting billet is an arc rectangle square billet, and the arc radius that its section configuration feature is four bights is 20%～40% of this thickness of strand.Carry out roughing with delivering to roughing mill after heating of arc rectangle square billet and the de-scaling then, through behind 8～10 passages rolling, the tandem finishing mill that enters horizontally and vertically alternative carries out continuous finish rolling, finish rolling enters the cold bed cooling behind qualified size, enter then that Runout area is aligned, sawing, flaw detection, bundling etc., finish production process.
The radius of further preferred arc rectangle square billet bight circular arc is 30%～40% of this thickness of strand.
Further preferred, the grooveless rolling method is used in roughing, and promptly roll is a plain-barreled roll.
Compare prior art, the present invention has following advantage:
1, use the production technology of a kind of large circular steel of indication of the present invention to produce large circular steel, for the technology of using continuous casting blooms production large circular steel, steel product quality is good, and rolling pass is few, and energy consumption is low.
2, use the production technology of a kind of large circular steel of indication of the present invention to produce large circular steel, with respect to using continuous cast round billets to produce for the technology of large circular steel, the operation of rolling is simple, and it is low to roll useless rate, the lumber recovery height, and cost reduces.
3, when the grooveless rolling method is used in roughing, compare, have the advantage that roll-force is little, power consumption is low, roll consumption is few with the hole shape of box-shaped hole or diamond hole is rolling.
Description of drawings
Accompanying drawing 1 is first kind of sectional view of arc rectangle square billet.The width B of this steel billet equates that with thickness H four bights all are orthodromes.
Accompanying drawing 2 is second kind of sectional view of arc rectangle square billet.The width B of this steel billet is greater than thickness H, and four bights all are orthodromes.
Accompanying drawing 3 is to use continuous cast round billets sectional view after rolling several passages before roughing mill turns over steel for the first time, and the both sides, cross section are curved.
Accompanying drawing 4 is to use the sectional view of continuous cast round billets after turning over steel for the first time after the rolling several passages of roughing mill, and the top and bottom, cross section are curved.
The specific embodiment
Below in conjunction with embodiment the specific embodiment of the present invention is described.
Embodiment 1: qualified molten steel is cast arc rectangle square billet through conticaster, and size is as shown in accompanying drawing 1 is, the width B=500mm of steel billet, and thickness H=500mm, four bights all are orthodromes, arc radius R=150mm.Send into heating furnace and be heated to 1100 ℃～1130 ℃, enter the descaling mill de-scaling after coming out of the stove, enter roughing mill again and back and forth turn over 90 ° of steel after rolling 2 passages, because all there is the plane its top and bottom, so operation and all be stable when stinging steel on roller-way, the steel billet section becomes rectangle after reciprocal more rolling 2 passages, and then turns over 90 ° of steel, reciprocal more rolling 2 passages, and then turn over 90 ° of steel, reciprocal more rolling 2 passages, totally 8 passages are sent to rolled piece four frame horizontally and vertically alternative tandem finishing mill finish rolling again, roll into the large circular steel of diameter 250mm, enter the cold bed cooling then, enter Runout area again and align, sawing, flaw detection, bundlings etc. are finished production process.
Embodiment 2: qualified molten steel is cast arc rectangle square billet through conticaster, size as shown in Figure 2, the width B=650mm of steel billet, thickness H=450mm, four bights all are orthodromes, arc radius R=160mm.Qualified molten steel is after conticaster is cast arc rectangle square billet, send into heating furnace and be heated to 1080 ℃～1110 ℃, enter the descaling mill de-scaling after coming out of the stove, turn over 90 ° of steel, enter roughing mill then and back and forth turn over 90 ° of steel again after rolling 2 passages, because all there is the plane its top and bottom, so operation and all be stable when stinging steel on roller-way, the steel billet section becomes rectangle after reciprocal more rolling 2 passages, and then turns over 90 ° of steel, reciprocal more rolling 2 passages, and then turn over 90 ° of steel, reciprocal more rolling 2 passages, totally 8 passages are sent to rolled piece four frame horizontally and vertically alternative tandem finishing mill finish rolling again, roll into the large circular steel of diameter 300mm, enter the cold bed cooling then, enter Runout area again and align, sawing, flaw detection, bundlings etc. are finished production process.
Claims (3)
1. the production technology of a large circular steel, comprise operations such as continuous casting, steel billet heating, de-scaling, roughing, finish rolling, cooling, finishing, it is characterized in that: the continuous casting billet that uses in the roughing operation is arc rectangle square billet, and its section configuration is that the radius in four bights is 20%～40% of these thickness of strand.
2. the production technology of a kind of large circular steel according to claim 1, it is characterized in that: the radius of arc rectangle square billet bight orthodrome is 30%～40% of this thickness of strand.
3. the production technology of a kind of large circular steel according to claim 1 is characterized in that: the grooveless rolling method is used in roughing, and promptly roll is a plain-barreled roll.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810159861A CN101733619A (en) | 2008-11-12 | 2008-11-12 | Production technology of large round steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810159861A CN101733619A (en) | 2008-11-12 | 2008-11-12 | Production technology of large round steel |
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| CN101733619A true CN101733619A (en) | 2010-06-16 |
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| CN200810159861A Pending CN101733619A (en) | 2008-11-12 | 2008-11-12 | Production technology of large round steel |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102198494A (en) * | 2011-05-09 | 2011-09-28 | 上海亚新冶金设备有限公司 | Novel rectangular casting blank section |
| CN104190706A (en) * | 2014-09-24 | 2014-12-10 | 山东钢铁股份有限公司 | Method for employing large cross-section continuous casting round billet to roll round steel bar |
| CN110284062A (en) * | 2019-06-29 | 2019-09-27 | 江阴兴澄特种钢铁有限公司 | It is a kind of with high-intensitive, the major diameter round steel of high tenacity and its manufacturing method |
| CN110560480A (en) * | 2019-09-16 | 2019-12-13 | 江苏联峰实业有限公司 | rolling method for improving compactness of large-size high-carbon manganese-chromium steel |
| CN112122570A (en) * | 2020-09-17 | 2020-12-25 | 马钢集团设计研究院有限责任公司 | Compact arrangement system for billet discharging area of billet continuous casting machine |
-
2008
- 2008-11-12 CN CN200810159861A patent/CN101733619A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102198494A (en) * | 2011-05-09 | 2011-09-28 | 上海亚新冶金设备有限公司 | Novel rectangular casting blank section |
| CN104190706A (en) * | 2014-09-24 | 2014-12-10 | 山东钢铁股份有限公司 | Method for employing large cross-section continuous casting round billet to roll round steel bar |
| CN110284062A (en) * | 2019-06-29 | 2019-09-27 | 江阴兴澄特种钢铁有限公司 | It is a kind of with high-intensitive, the major diameter round steel of high tenacity and its manufacturing method |
| CN110284062B (en) * | 2019-06-29 | 2022-01-14 | 江阴兴澄特种钢铁有限公司 | Large-diameter round steel with high strength and high toughness and manufacturing method thereof |
| CN110560480A (en) * | 2019-09-16 | 2019-12-13 | 江苏联峰实业有限公司 | rolling method for improving compactness of large-size high-carbon manganese-chromium steel |
| CN112122570A (en) * | 2020-09-17 | 2020-12-25 | 马钢集团设计研究院有限责任公司 | Compact arrangement system for billet discharging area of billet continuous casting machine |
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Application publication date: 20100616 |