CN102071355A - Steel for liquefied petroleum gas cylinders produced by continuous casting and rolling of medium and thin slabs and production method thereof - Google Patents
Steel for liquefied petroleum gas cylinders produced by continuous casting and rolling of medium and thin slabs and production method thereof Download PDFInfo
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Abstract
The invention relates to steel for liquefied petroleum gas cylinders produced by continuous casting and rolling of medium and thin slabs and a production method thereof, which belong to the technical field of metallurgical steel rolling. Steel plates with high stamping performance can be obtained on medium and thin slab production lines through controlled rolling and controlled cooling technology. The technical scheme is that the steel comprises the following chemical components in percentage by mass: 0.15 to 0.18 percent of C, 0.70 to 0.90 percent of Mn, 0.10 percent of Si, less than or equal to 0.008 percent of S, less than or equal to 0.020 percent of P, 0.015 to 0.035 percent of Als, less than or equal to 0.005 percent of N, and the balance of Fe. The steel for producing the liquefied petroleum gas cylinders has the tensile strength of 445 to 470Mpa, the yield strength of 305 to 335MPa, the elongation of 35 to 40 percent, and the yield ratio of less than or equal to 0.8. By the production method, the medium and thin slab production lines subjected to process improvement are used for producing steel for welded gas cylinders, and the steel plates with good stamping performance are obtained, so that the production cost of the steel for the welded gas cylinders is reduced; and the steel plates produced by the method can meet various mechanical performance indexes used for manufacturing the liquefied petroleum gas cylinders.
Description
Technical field
The present invention relates to a kind of medium thin slab continuous casting and rolling production LP gas cylinder with steel and production method thereof, on the medium thin slab production line,, obtain having the steel plate of good stamping performance, belong to metallurgical technical field of steel rolling by the cooling controlling and rolling controlling process technology.
Background technology
LP gas cylinder belongs to two, third class(grade) pressure vessel, be to be welded by end socket that draws and reel, Yin Qinei dress flammable and combustible liquids or gas, require very strict to mother metal, because end socket is in drawing process, steel plate is in uniform strained condition, so mother metal not only should have good comprehensive mechanical performance, but also needs good deep drawability and welding property.And higher requirement is proposed the gauge of steel plate.From metallographic structure and performance analysis, tiny and uniform ferrite, pearlitic structure will help the forming property of steel; The performance of steel evenly reaches the draw forming performance that low yield strength ratio control also will help steel.Slave plate shape and size control aspect are analyzed, and the homogeneous thickness size will make steel stressed even in drawing deformation process, and will be favourable to being shaped.The weldering bottle steel production technique of background technology for adopt thickness greater than the strand more than the 200mm after the cogging of roughing multi-pass, carry out finish rolling again, because it is generally thinner to make the mother metal of LP gas cylinder, most of below 4.0mm, make that weldering bottle steel energy consumption in production process is higher, cause weldering bottle steel cost to improve.
Summary of the invention
The object of the invention provides a kind of medium thin slab continuous casting and rolling production LP gas cylinder steel and production method thereof, process modification by the centering sheet billet production line, obtain having the steel plate of good stamping performance, reduce weldering bottle steel production cost, solve the problems referred to above that exist in the background technology.
Technical scheme of the present invention is:
A kind of medium thin slab continuous casting and rolling production LP gas cylinder steel, its special feature is: the chemical ingredients massfraction is: C%:0.15-0.18; Mn%:0.70-0.90; Si%: ￡ 0.10; S% :≤0.008; P% :≤0.020; Als%:0.015-0.035; N% :≤0.005; All the other are iron.
Above-mentioned steel grade production LP gas cylinder steel, tensile strength: 445-470Mpa; Yield strength: 305-335Mpa; Elongation 35-40%, yield tensile ratio≤0.8.
A kind of medium thin slab continuous casting and rolling production LP gas cylinder is with the production method of steel, comprises medium thin slab continuous casting, process furnace heating, roughing, Coil Box, finish rolling, cools off, batches, the finished product operation; The chemical ingredients massfraction of described steel grade is: C%:0.15-0.18; Mn%:0.70-0.90; Si%: ￡ 0.10; S% :≤0.008; P% :≤0.020; Als%:0.015-0.035; N% :≤0.005; All the other are iron.
Said medium thin slab continuous casting working procedure, slab thickness are 150mm; The strand hot charging directly enters process furnace and heats.
Said roughing operation, slab heating temperature is 1100-1150 ℃, enters the roughing mill roughing; Rolling 5 passages, the intermediate blank size is at 35-40mm.
Said Coil Box operation, intermediate blank enters the Coil Box samming.
Said finish rolling operation enters finishing mill finish rolling through the intermediate blank of samming, and the finish rolling population temperature is 1000-1050 ℃; Finishing temperature is 830-870 ℃.
Said coiling process is 620-660 ℃ according to product performance and specification control coiling temperature.
Said refrigerating work procedure is two sections cooling modes.
Adopt above-mentioned processing method can be met the steel of producing the gas cylinder performance requriements.
Beneficial effect of the present invention: the present invention is by the process modification of centering sheet billet production line, with medium thin slab production line production LP gas cylinder steel, also claim weldering bottle steel, obtain having the steel plate of good stamping performance, thereby reduce weldering bottle steel production cost, the steel plate that utilizes this method to produce can satisfy every mechanical performance index of making liquefied petroleum gas steel cylinder.
Description of drawings
Fig. 1 is the metallographic structure figure of the embodiment of the invention.
Embodiment
The invention will be further described by the following examples.
A kind of medium thin slab continuous casting and rolling production LP gas cylinder steel, its special feature is that the chemical ingredients massfraction is: C%:0.15-0.18; Mn%:0.70-0.90; Si%: ￡ 0.10; S% :≤0.008; P% :≤0.020; Als%:0.015-0.035; N% :≤0.005; All the other are iron.
Above-mentioned steel grade production LP gas cylinder steel, tensile strength: 445-470Mpa; Yield strength: 305-335Mpa; Elongation 35-40%, yield tensile ratio 0.68-0.73.
A kind of medium thin slab continuous casting and rolling production LP gas cylinder is with the production method of steel, comprises medium thin slab continuous casting, process furnace heating, roughing, Coil Box, finish rolling, cools off, batches, the finished product operation; The chemical ingredients massfraction of described steel grade is: C%:0.15-0.18; Mn%:0.70-0.90; Si%: ￡ 0.10; S% :≤0.008; P% :≤0.020; Als%:0.015-0.035; N% :≤0.005; All the other are iron.
Said medium thin slab continuous casting working procedure, slab thickness are 150mm; The strand hot charging directly enters process furnace and heats.
Said roughing operation, slab heating temperature is 1100-1150 ℃, enters the roughing mill roughing; Rolling 5 passages, the intermediate blank size is at 35-40mm.
Said Coil Box operation, intermediate blank enters the Coil Box samming.
Said finish rolling operation enters finishing mill finish rolling through the intermediate blank of samming, and the finish rolling population temperature is 1000-1050 ℃; Finishing temperature is 830-870 ℃.
Said coiling process is 620-660 ℃ according to product performance and specification control coiling temperature.
Said refrigerating work procedure is two sections cooling modes.
With reference to accompanying drawing 1, metallographic structure of the present invention is perlite+ferritic structure.
Specific embodiments of the invention are as follows:
Embodiment one:
Produce 4.mm thickness gas cylinder steel, chemical ingredients is as follows: C%:0.16; Mn%:0.90; Si%:0.10; S%:0.008; P%:0.015; N%:0.004; Als%:0.02; All the other are iron.Slab heating temperature is 1120 ℃, enters the roughing mill roughing; Intermediate blank 40mm is thick, enters the Coil Box samming; Intermediate blank through samming enters finishing mill finish rolling, and its finishing mill temperature in is 1030 ℃, and finishing temperature is 830 ℃; Coiling temperature is 620 ℃.
Embodiment two:
Produce 2.9mm thickness gas cylinder steel, chemical ingredients is as follows: C%:0.15; Mn%:0.80; Si%:0.03; S%:0.006; P%:0.020; N4%:0.005; Als%:0.035; All the other are iron.Slab heating temperature is 1150 ℃, enters the roughing mill roughing; Intermediate blank 35mm is thick, and the intermediate blank after the roughing enters the Coil Box samming; Intermediate blank through samming enters finishing mill finish rolling, and its finishing mill temperature in is 1050 ℃, and finishing temperature is 850 ℃; Coiling temperature is 640 ℃.
Embodiment three:
Rolling 2.3mm thickness gas cylinder steel, chemical ingredients is as follows: C%:0.18; Mn%:0.70; Si%:0.01; S%:0.005; P%:0.011; N%:0.003; Als%:0.015; All the other are iron.Slab heating temperature is 1100 ℃, enters the roughing mill roughing; Intermediate blank 35mm is thick, and the intermediate blank after the roughing enters the Coil Box samming; Intermediate blank through samming enters finishing mill finish rolling, and its finishing mill temperature in is 1000 ℃, and finishing temperature is 860 ℃; Coiling temperature is 660 ℃.
Embodiment four:
Produce 4.0mm thickness gas cylinder steel, chemical ingredients is as follows: C%:0.15; Mn%:0.70; Si%:0.10; S%:0.008; P%:0.020; Als%:0.015; N%:0.005; All the other are iron.Slab heating temperature is 1100 ℃, enters the roughing mill roughing; Intermediate blank 35mm is thick, and the intermediate blank after the roughing enters the Coil Box samming; Intermediate blank through samming enters finishing mill finish rolling, and its finishing mill temperature in is 1000 ℃, and finishing temperature is 830 ℃; Coiling temperature is 620 ℃.
Embodiment five:
Produce 2.3mm thickness gas cylinder steel, chemical ingredients is as follows: C%:0.18; Mn%:0.90; Si%:0.10; S%:0.008; P%:0.020; Als%:0.035; N%:0.005; All the other are iron.Slab heating temperature is 1150 ℃, enters the roughing mill roughing; Intermediate blank 40mm is thick, and the intermediate blank after the roughing enters the Coil Box samming; Intermediate blank through samming enters finishing mill finish rolling, and its finishing mill temperature in is 1050 ℃, and finishing temperature is 870 ℃; Coiling temperature is 660 ℃.
The gas cylinder that the various embodiments described above obtain is as follows with the performance level of steel:
Tensile strength: 445-470Mpa; Yield strength: 305-335Mpa; Elongation 35-40%, yield tensile ratio 0.68-0.73.
Claims (8)
1. a medium thin slab continuous casting and rolling production LP gas cylinder steel is characterized in that the chemical ingredients massfraction is: C%:0.15-0.18; Mn%:0.70-0.90; Si%: ￡ 0.10; S% :≤0.008; P% :≤0.020; Als%:0.015-0.035; N% :≤0.005; All the other are iron.
According to claim 1 described among CSP production LP gas cylinder steel, it is characterized in that above-mentioned steel grade production LP gas cylinder steel, tensile strength: 445-470Mpa; Yield strength: 305-335Mpa; Elongation 35-40%, yield tensile ratio≤0.8.
3. a medium thin slab continuous casting and rolling production LP gas cylinder is with the production method of steel, it is characterized in that comprising medium thin slab continuous casting, process furnace heating, roughing, Coil Box, finish rolling, cools off, batches, the finished product operation; The chemical ingredients massfraction of described steel grade is: C%:0.15-0.18; Mn%:0.70-0.90; Si%: ￡ 0.10; S% :≤0.008; P% :≤0.020; Als%:0.015-0.035; N% :≤0.005; All the other are iron.
According to claim 3 described among CSP production LP gas cylinder with the production method of steel, it is characterized in that said medium thin slab continuous casting working procedure, slab thickness is 150mm; The strand hot charging directly enters process furnace and heats.
According to claim 3 or 4 described among CSP production LP gas cylinder with the production method of steel, it is characterized in that said Coil Box operation, intermediate blank enters the Coil Box samming.
According to claim 3 or 4 described among CSP production LP gas cylinder with the production method of steel, it is characterized in that said finish rolling operation, enter finishing mill finish rolling through the intermediate blank of samming, the finish rolling population temperature is 1000-1050 ℃; Finishing temperature is 830-870 ℃.
According to claim 3 or 4 described among CSP production LP gas cylinder with the production method of steel, it is characterized in that said coiling process, be 620-660 ℃ according to product performance and specification control coiling temperature.
According to claim 3 or 4 described among CSP production LP gas cylinder with the production method of steel, it is characterized in that said refrigerating work procedure, be two sections cooling modes.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103643116A (en) * | 2013-11-27 | 2014-03-19 | 攀钢集团攀枝花钢铁研究院有限公司 | Welding gas cylinder and manufacturing technology of hot rolled steel plate of welding gas bottle |
| CN103774039A (en) * | 2013-12-26 | 2014-05-07 | 马钢(集团)控股有限公司 | Manufacturing process for steel hot-rolled plate coil for welded gas bottle |
| CN107988549A (en) * | 2016-10-27 | 2018-05-04 | 鞍钢股份有限公司 | Low-yield-ratio welding bottle steel and manufacturing method thereof |
| CN111876652A (en) * | 2020-07-15 | 2020-11-03 | 广州大学 | Method for producing automobile girder plate by thin slab continuous casting and rolling |
| CN113862577A (en) * | 2021-10-12 | 2021-12-31 | 新疆八一钢铁股份有限公司 | Production method of high-strength low-yield-ratio welded gas cylinder steel |
| CN113930674A (en) * | 2021-09-13 | 2022-01-14 | 广西柳州钢铁集团有限公司 | Welded bottle steel hot-rolled plate strip HP295 and manufacturing method thereof |
| CN114086059A (en) * | 2021-10-26 | 2022-02-25 | 广西柳州钢铁集团有限公司 | High-stability low-yield-ratio hot-rolled welded cylinder steel and production method thereof |
| CN115418575A (en) * | 2022-10-21 | 2022-12-02 | 重庆钢铁股份有限公司 | High-precision low-yield-ratio steel belt for HP295 welded gas cylinder and production method thereof |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103643116A (en) * | 2013-11-27 | 2014-03-19 | 攀钢集团攀枝花钢铁研究院有限公司 | Welding gas cylinder and manufacturing technology of hot rolled steel plate of welding gas bottle |
| CN103774039A (en) * | 2013-12-26 | 2014-05-07 | 马钢(集团)控股有限公司 | Manufacturing process for steel hot-rolled plate coil for welded gas bottle |
| CN103774039B (en) * | 2013-12-26 | 2016-09-14 | 马钢(集团)控股有限公司 | A kind of hot-rolled plate coil for welded gas cylinder manufacturing process |
| CN107988549A (en) * | 2016-10-27 | 2018-05-04 | 鞍钢股份有限公司 | Low-yield-ratio welding bottle steel and manufacturing method thereof |
| CN111876652A (en) * | 2020-07-15 | 2020-11-03 | 广州大学 | Method for producing automobile girder plate by thin slab continuous casting and rolling |
| CN113930674A (en) * | 2021-09-13 | 2022-01-14 | 广西柳州钢铁集团有限公司 | Welded bottle steel hot-rolled plate strip HP295 and manufacturing method thereof |
| CN113930674B (en) * | 2021-09-13 | 2022-07-22 | 广西柳州钢铁集团有限公司 | Welded bottle steel hot-rolled plate strip HP295 and manufacturing method thereof |
| CN115233093A (en) * | 2021-09-13 | 2022-10-25 | 广西柳州钢铁集团有限公司 | Welding bottle steel hot-rolled plate strip HP295 |
| CN115233093B (en) * | 2021-09-13 | 2023-07-18 | 广西柳州钢铁集团有限公司 | Welded bottle steel hot rolled strip HP295 |
| CN113862577A (en) * | 2021-10-12 | 2021-12-31 | 新疆八一钢铁股份有限公司 | Production method of high-strength low-yield-ratio welded gas cylinder steel |
| CN114086059A (en) * | 2021-10-26 | 2022-02-25 | 广西柳州钢铁集团有限公司 | High-stability low-yield-ratio hot-rolled welded cylinder steel and production method thereof |
| CN115418575A (en) * | 2022-10-21 | 2022-12-02 | 重庆钢铁股份有限公司 | High-precision low-yield-ratio steel belt for HP295 welded gas cylinder and production method thereof |
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Application publication date: 20110525 |