CN103509925B - A kind of low cost production thereof promoting Q345R steel plate inspection qualification rate - Google Patents
A kind of low cost production thereof promoting Q345R steel plate inspection qualification rate Download PDFInfo
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Abstract
The present invention relates to a kind of low cost production thereof promoting Q345R steel plate inspection qualification rate; This technique mainly comprises: enter stove molten iron S≤0.010%; Converter tapping controls total oxygen content≤20ppm; LF refining controlling terminal S≤0.005%; When steel plate thickness >=60mm or compression ratio≤10 on-line shearing, take RH refining, vacuum tightness≤5.0mbar, maintenance >=12min; When product thickness controls at 12-80mm, final rolling temperature 1020-870 DEG C, finish to gauge controls at 820-830 DEG C, wait return red to 700-680 DEG C after to roll off the production line cooling; To roll off the production line during product thickness≤60mm temperature >=350 DEG C, shear after stacking slow cooling 72h; The present invention, by distributing the techniques such as control sulphur, deep deoxidation, RH refining and steel plate stacking slow cooling scientifically and rationally, reaches the object that low cost promotes Q345R steel plate inspection qualification rate.
Description
Technical field
The present invention relates to a kind of production technique of steel plate of pressure vessel, be specifically a kind of low cost production thereof promoting Q345R steel plate inspection qualification rate, belong to field of metallurgy.
Background technology
The ordinary low-alloy steel pressurized vessel personality board of Q345R steel to be yield strength be 340MPa level, it has good comprehensive mechanical property and processing performance, is the pressurized vessel steel plate special that China's purposes is the widest, consumption is maximum at present.Therefore, stricter requirement is all had to its surface and internal soundness.But Q345R steel plate inspection disqualification rate is high is all one of the most normal produced problem of its production process all the time, analyzes through correlation detection and find, cause the underproof major defect of Q345R steel plate inspection to have center segregation, centre burst and MnS to be mingled with.Therefore related production enterprise is mainly through (1) strengthening refining means, controls the impurity content such as phosphorus, sulphur in molten steel further; (2) the proper extension soft blow time; (3) improve RH vacuum tightness and extend the pumpdown time; (4) strengthen arc alignment precision of continuous caster and improve pressure effect, improving slab quality; (5) casting blank stacking slow cooling is strengthened; (6) adopt the large pressure of high temperature, strengthen sex change infiltration; (7) steel plate rolls off the production line the measures such as stacking slow cooling to improve Q345R steel plate inspection qualification rate.
Chinese patent CN102002630A discloses one " hic resistance steels for pressure vessel use Q345R-Z35 special heavy plate and production method thereof " its production method taked and comprises the following steps: the technique such as molten iron KR desulfurization, converter smelting, LF are concise, VD vacuum outgas, die casting cast, Heating Steel Ingots, rolling, ACC cooling, aligning, steel plate cooling in heap, normalizing thermal treatment; This invention is by reasonable component design, Process Route, have developed special thick steel heavy plate for pressure vessels, detected result shows, one-level flaw detection qualification rate, performance initial test qualification rate all reach 100%, in addition anti-lamellar tearing performance reaches Z35 rank, and anti-hydrogen induced cracking detected result is excellent; Weak point adopts die casting cast, and add normalizing heat treatment step, both reduced production efficiency, and turn increased production cost.
Summary of the invention
Technical problem to be solved by this invention is, a kind of low cost production thereof promoting Q345R steel plate inspection qualification rate is provided, this technique, mainly through being distributed scientifically and rationally by the technological measures such as control sulphur, deoxidation, RH refining and steel plate stacking slow cooling, reaches the object that low cost promotes Q345R steel plate inspection qualification rate.
The present invention solves the technical scheme of above technical problem:
Promote a low cost production thereof for Q345R steel plate inspection qualification rate, comprising: hot metal pre process procedures, bessemerize operation, LF refining procedure, RH refining procedure, continuous casting working procedure, strand cooling in heap, heating, high-pressure water descaling, rolling, ultrafast but cold, hot straightening, steel plate cooling in heap, shear, surface examination, manual ultrasonic flaw; In described hot metal pre process procedures, blast-melted blowing magnesium+lime powder of taking carries out pre-treatment, and fully skims after pre-treatment; In described continuous casting working procedure; continuous casting adopts full guard casting; it is characterized in that: by being distributed scientifically and rationally by the technological measures such as control sulphur, deep deoxidation, RH refining and steel plate stacking slow cooling, reach the object that low cost promotes Q345R steel plate inspection qualification rate, concrete steps are as follows:
In described hot metal pre process procedures, converter is made to enter S≤0.010% in stove molten iron;
Describedly bessemerize in operation, add 20kg aluminium block by every 100ppm oxygen after converter tapping and carry out deep deoxidation, ensure that final total oxygen content TO controls at below 20ppm;
In described LF refining procedure, in converter tapping process, slag charge adds by 8-10kg steel per ton, controls sulphur content S≤0.005%;
In described RH refining procedure, when the strand in rolling process requires rolled sheet material thickness >=60mm or rolling reduction≤10 on-line shearing plate, this strand needs to enter RH refining procedure, otherwise this part is omitted, vacuum tightness≤5.0mbar is required when the condition of RH refining procedure is vacuum-treat, hold-time >=12min;
In described continuous casting working procedure, constant pulling rate 0.9-1.0m/min;
Described rolling process is divided into roughing and finish rolling two-phase control rolling, rough rolling step takes the large pressing operation of high temperature, roughing start rolling temperature controls at 1100 ~ 1200 DEG C, single pass draft controls more than 15%, optimizes intermediate blank design, when product thickness h controls at 12-80mm, workpiece thickness controls between 3.2h-1.6h, finish rolling start rolling temperature controls at 1020-870 DEG C, finishing temperature control at 820-830 DEG C, cooling of rolling off the production line after red temperature is to 700-680 DEG C;
In described steel plate heap cooling working procedure, the steel plate being below 60mm on-line shearing for product thickness needs to adopt steel plate cooling in heap, and temperature >=350 DEG C of now rolling off the production line, shear after stacking slow cooling 72h.
The technical scheme that the present invention limits further is:
Further, alloy needed for smelting process and slag charge all fully need toast more than 12h at the bakery of >=40 DEG C.
Further, in LF refining procedure and RH refining procedure, under treating that thermometric sampling judges qualified prerequisite, by pure calcium line 150-180m/ stove feeding, feed silk and terminate quietly to stir >=10min afterwards.
Further, all alloys and slag charge all fully need toast at the bakery of 40 DEG C; In hot metal pre process procedures, converter is made to enter S:0.008% in stove molten iron; In LF refining procedure, in converter tapping process, slag charge adds by 8kg steel per ton, controls sulphur content S:0.003%, and pure calcium line is according to the feeding of 150m/ stove, and feeding is quiet afterwards stirs 12min; In RH refining procedure, strand in rolling process requires rolled sheet material thickness >=60mm or rolling reduction≤10 on-line shearing plate, this strand needs to enter RH refining procedure, vacuum tightness 4.8mbar is required when now the condition of RH refining procedure is vacuum-treat, hold-time 12min, otherwise this part is omitted, pure calcium line is according to 150m, stove feeding, and feeding is quiet afterwards stirs 12min; In continuous casting working procedure, constant pulling rate 0.9m/min; Rolling process is divided into roughing and finish rolling two-phase control rolling, rough rolling step takes the large pressing operation of high temperature, roughing start rolling temperature controls at 1100 DEG C, single pass draft controls 15%, optimizes intermediate blank design, when product thickness h is 20mm, workpiece thickness controls at 2.6h, finish rolling start rolling temperature controls at 960 DEG C, finishing temperature control at 820 DEG C, wait return red to 700 DEG C after to roll off the production line cooling; Steel plate cooling in heap, to roll off the production line temperature 350 DEG C for the product thickness steel plate that is 23mm.
Further, all alloys and slag charge all fully need toast at the bakery of 45 DEG C; In hot metal pre process procedures, converter is made to enter S:0.009% in stove molten iron; In LF refining procedure, in converter tapping process, slag charge adds by 9kg steel per ton, controls sulphur content S:0.004%, and pure calcium line is according to the feeding of 160m/ stove, and feeding is quiet afterwards stirs 11min; In RH refining procedure, strand in rolling process requires rolled sheet material thickness >=60mm or rolling reduction≤10 on-line shearing plate, this strand needs to enter RH refining procedure, vacuum tightness: 4.9mbar is required during Steel Plate Vacuum process, hold-time: 13min, pure calcium line is according to the feeding of 160m/ stove, and feeding is quiet afterwards stirs 11min; In continuous casting working procedure, constant pulling rate 0.95m/min; Rolling process is divided into roughing and finish rolling two-phase control rolling, rough rolling step takes the large pressing operation of high temperature, roughing start rolling temperature controls at 1150 DEG C, single pass draft controls 16.7%, optimizes intermediate blank design, when product thickness h controls at 45mm, workpiece thickness controls between 2.0h, finish rolling start rolling temperature controls at 890 DEG C, finishing temperature control at 830 DEG C, wait return red to 680 DEG C after to roll off the production line cooling; Steel plate cooling in heap, to roll off the production line temperature 355 DEG C for the product thickness steel plate that is 35mm.
Further, all alloys and slag charge all fully need toast at the bakery of 50 DEG C; In hot metal pre process procedures, converter is made to enter S:0.010% in stove molten iron; In LF refining procedure, in converter tapping process, slag charge adds by 10kg steel per ton, controls sulphur content S:0.005%, and pure calcium line is according to the feeding of 180m/ stove, and feeding is quiet afterwards stirs 12min; In RH refining procedure, strand in rolling process requires rolled sheet material thickness >=60mm or rolling reduction≤10 on-line shearing plate, this strand needs to enter RH refining procedure, vacuum tightness: 5.0mbar is required during Steel Plate Vacuum process, hold-time: 14min, pure calcium line is according to the feeding of 180m/ stove, and feeding is quiet afterwards stirs 12min; In continuous casting working procedure, constant pulling rate 1.0m/min; Rolling process is divided into roughing and finish rolling two-phase control rolling, rough rolling step takes the large pressing operation of high temperature, roughing start rolling temperature controls at 1200 DEG C, single pass draft controls 19.8%, optimizes intermediate blank design, when product thickness h controls at 55mm, workpiece thickness controls between 1.8h, finish rolling start rolling temperature controls at 870 DEG C, finishing temperature control at 830 DEG C, wait return red to 680 DEG C after to roll off the production line cooling; Steel plate cooling in heap, to roll off the production line temperature 360 DEG C for the product thickness steel plate that is 50mm.
In a word, the present invention, by being distributed scientifically and rationally by the technological measures such as control sulphur, deep deoxidation, RH refining and steel plate stacking slow cooling, reaches the object that low cost promotes Q345R steel plate inspection qualification rate to >=99%.
Embodiment
embodiment 1
Medium plate mill of Nanjing Unite Steel Co., Ltd, May, Q345R; At converter procedure, adopting blowing magnesium+lime powder technique to carry out pre-treatment to entering stove molten iron, entering mean content of sulfur S=0.008% in stove molten iron, fully skimming after pre-treatment; In LF refining procedure, LF sets off mean content of sulfur S=0.003%; RH process, steel plate steel rolling compression ratio is 1.4, shearing thickness 60mm, vacuum tightness 4.8mbar, hold-time 12min; In LF refining process under composition and the qualified prerequisite of temperature, by pure calcium line 150m/ stove feeding, feeding silk, to terminate the rear quiet time of stirring be 12min; At continuous casting working procedure, adopt total process protective casting, constant pulling rate 0.9m/min; Strengthen casting machine situation to check and safeguard, to arc deviation be strict controlled in ± 3mm within, liquid fluctuating controls within ± 3mm; Continuously cast bloom more than low multiple quality B1.0 (comprising B1.0, B0.5 and C level) ratio is 93.33%; The all alloys of smelting process and slag charge all fully toast at the bakery of 40 DEG C; Rolling process is divided into roughing and finish rolling two-phase control rolling, rough rolling step takes the large pressing operation of high temperature, roughing start rolling temperature controls at 1100 DEG C, single pass draft controls 15%, optimizes intermediate blank design, when product thickness h is 20mm, workpiece thickness controls at 2.6h, finish rolling start rolling temperature controls at 960 DEG C, finishing temperature control at 820 DEG C, wait return red to 700 DEG C after to roll off the production line cooling; At finishing procedure, product thickness is sheared after 72h after 350 DEG C of stacking slow cooling at 23mm steel plate.
embodiment 2
Medium plate mill of Nanjing Unite Steel Co., Ltd, June, Q345R; At converter procedure, enter mean content of sulfur S=0.009% in stove molten iron, and fully skim after pre-treatment; At refining procedure, LF sets off mean content of sulfur S=0.004%; RH process, steel plate steel rolling compression ratio is 1.5, shearing thickness 70mm, vacuum tightness 4.9mbar, hold-time 13min; LF(or LF-RH) in refining process under composition and the qualified prerequisite of temperature, by pure calcium line 160m/ stove feeding, feed silk and terminate quietly to stir 11min afterwards; At continuous casting working procedure, adopt total process protective casting, constant pulling rate 0.95m/min; Strengthen casting machine situation to check and safeguard, to arc deviation be strict controlled in ± 3mm within, liquid fluctuating controls within ± 3mm; Continuously cast bloom more than low multiple quality B1.0 (comprising B1.0, B0.5 and C level) ratio is 96%; The all alloys of smelting process and slag charge all fully toast at the bakery of 45 DEG C; Rolling process is divided into roughing and finish rolling two-phase control rolling, rough rolling step takes the large pressing operation of high temperature, roughing start rolling temperature controls at 1150 DEG C, single pass draft controls 16.7%, optimizes intermediate blank design, when product thickness h controls at 45mm, workpiece thickness controls between 2.0h, finish rolling start rolling temperature controls at 890 DEG C, finishing temperature control at 830 DEG C, wait return red to 680 DEG C after to roll off the production line cooling; At finishing procedure, product thickness steel plate between 35mm is sheared after 72h after the temperature 355 DEG C of stacking slow cooling that roll off the production line.
embodiment 3
Medium plate mill of Nanjing Unite Steel Co., Ltd July, Q345R; At converter procedure, enter mean content of sulfur S=0.010% in stove molten iron, and fully skim after pre-treatment; At refining procedure, LF sets off mean content of sulfur S=0.005%; RH process, steel plate steel rolling compression ratio is 1.4, shearing thickness 80mm, vacuum tightness 5.0mbar, hold-time 14min; LF(or LF-RH) in refining process under composition and the qualified prerequisite of temperature, by pure calcium line 180m/ stove feeding, feed silk and terminate quietly to stir time 12min afterwards; At continuous casting working procedure, adopt total process protective casting, constant pulling rate 1.0m/min; Strengthen casting machine situation to check and safeguard, to arc deviation be strict controlled in ± 3mm within, liquid fluctuating controls within ± 3mm; Continuously cast bloom more than low multiple quality B1.0 (comprising B1.0, B0.5 and C level) ratio is 96.33%; The all alloys of smelting process and slag charge all fully toast at the bakery of 50 DEG C; Rolling process is divided into roughing and finish rolling two-phase control rolling, rough rolling step takes the large pressing operation of high temperature, roughing start rolling temperature controls at 1200 DEG C, single pass draft controls 19.8%, optimizes intermediate blank design, when product thickness h controls at 55mm, workpiece thickness controls between 1.8h, finish rolling start rolling temperature controls at 870 DEG C, finishing temperature control at 830 DEG C, wait return red to 680 DEG C after to roll off the production line cooling; At finishing procedure, product thickness steel plate between 50mm is sheared after 72h after the temperature 360 DEG C of stacking slow cooling that roll off the production line.
Following table is the actual detected result of output steel in each embodiment:
Table 1 is the actual detected result of output steel in embodiment one to three;
；
And the Q345R steel plate not adopting previous processes to produce, flaw detection qualification rate low (average qualification rate only 92.34%) and poor stability (be up to 98.94%, minimum is 88.35%); After adopting production technique described in patent of the present invention, the Q345R produced detects a flaw average qualification rate continually and steadily >=99%, and by the technological measures such as control sulphur, deep deoxidation, RH refining and steel plate stacking slow cooling are distributed scientifically and rationally, reach the object of low cost, production technique provided by the invention reaches the object promoting Q345R steel plate inspection qualification rate and reduce production cost.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of application claims.
Claims (6)
1. promote a low cost production thereof for Q345R steel plate inspection qualification rate, comprising: hot metal pre process procedures, bessemerize operation, LF refining procedure, RH refining procedure, continuous casting working procedure, strand cooling in heap, heating, high-pressure water descaling, rolling, ultrafast but cold, hot straightening, steel plate cooling in heap, shear, surface examination, manual ultrasonic flaw; In described hot metal pre process procedures, blast-melted blowing magnesium+lime powder of taking carries out pre-treatment, and fully skims after pre-treatment; In described continuous casting working procedure; continuous casting adopts full guard casting; it is characterized in that: by control sulphur, deep deoxidation, RH refining and the measure of steel plate stacking retarded cooling process being distributed scientifically and rationally, reach the object that low cost promotes Q345R steel plate inspection qualification rate, concrete steps are as follows:
In described hot metal pre process procedures, converter is made to enter S≤0.010% in stove molten iron;
Describedly bessemerize in operation, add 20kg aluminium block by every 100ppm oxygen after converter tapping and carry out deep deoxidation, ensure that final total oxygen content TO controls at below 20ppm;
In described LF refining procedure, in converter tapping process, slag charge adds by 8-10kg steel per ton, controls sulphur content S≤0.005%;
In described RH refining procedure, when the strand in rolling process requires rolled sheet material thickness >=60mm or rolling reduction≤10 on-line shearing plate, this strand needs to enter RH refining procedure, otherwise this part is omitted, vacuum tightness≤5.0mbar is required when the condition of RH refining procedure is vacuum-treat, hold-time >=12min;
In described continuous casting working procedure, constant pulling rate 0.9-1.0m/min;
Described rolling process is divided into roughing and finish rolling two-phase control rolling, rough rolling step takes the large pressing operation of high temperature, roughing start rolling temperature controls at 1100 ~ 1200 DEG C, single pass draft controls more than 15%, optimizes intermediate blank design, when product thickness h controls at 12-80mm, workpiece thickness controls between 3.2h-1.6h, finish rolling start rolling temperature controls at 1020-870 DEG C, finishing temperature control at 820-830 DEG C, cooling of rolling off the production line after red temperature is to 700-680 DEG C;
In described steel plate heap cooling working procedure, the steel plate being below 60mm on-line shearing for product thickness needs to adopt steel plate cooling in heap, and temperature >=350 DEG C of now rolling off the production line, shear after stacking slow cooling 72h.
2. production technique according to claim 1, is characterized in that: alloy needed for smelting process and slag charge all fully need toast more than 12h at the bakery of >=40 DEG C.
3. production technique according to claim 1, is characterized in that: in LF refining procedure and RH refining procedure, under treating that thermometric sampling judges qualified prerequisite, by pure calcium line 150-180m/ stove feeding, feeds silk and terminates quietly to stir >=10min afterwards.
4. production technique according to claim 1, is characterized in that: all alloys and slag charge all fully need toast at the bakery of 40 DEG C; In hot metal pre process procedures, converter is made to enter S:0.008% in stove molten iron; In LF refining procedure, in converter tapping process, slag charge adds by 8kg steel per ton, controls sulphur content S:0.003%, and pure calcium line is according to the feeding of 150m/ stove, and feeding is quiet afterwards stirs 12min; In RH refining procedure, strand in rolling process requires rolled sheet material thickness >=60mm or rolling reduction≤10 on-line shearing plate, this strand needs to enter RH refining procedure, vacuum tightness 4.8mbar is required when now the condition of RH refining procedure is vacuum-treat, hold-time 12min, otherwise this part is omitted, pure calcium line is according to the feeding of 150m/ stove, and feeding is quiet afterwards stirs 12min; In continuous casting working procedure, constant pulling rate 0.9m/min; Rolling process is divided into roughing and finish rolling two-phase control rolling, rough rolling step takes the large pressing operation of high temperature, roughing start rolling temperature controls at 1100 DEG C, single pass draft controls 15%, optimizes intermediate blank design, when product thickness h is 20mm, workpiece thickness controls at 2.6h, finish rolling start rolling temperature controls at 960 DEG C, finishing temperature control at 820 DEG C, wait return red to 700 DEG C after to roll off the production line cooling; Steel plate cooling in heap, to roll off the production line temperature 350 DEG C for the product thickness steel plate that is 23mm.
5. production technique according to claim 1, is characterized in that: all alloys and slag charge all fully need toast at the bakery of 45 DEG C; In hot metal pre process procedures, converter is made to enter S:0.009% in stove molten iron; In LF refining procedure, in converter tapping process, slag charge adds by 9kg steel per ton, controls sulphur content S:0.004%, and pure calcium line is according to the feeding of 160m/ stove, and feeding is quiet afterwards stirs 11min; In RH refining procedure, strand in rolling process requires rolled sheet material thickness >=60mm or rolling reduction≤10 on-line shearing plate, this strand needs to enter RH refining procedure, vacuum tightness: 4.9mbar is required during Steel Plate Vacuum process, hold-time: 13min, pure calcium line is according to the feeding of 160m/ stove, and feeding is quiet afterwards stirs 11min; In continuous casting working procedure, constant pulling rate 0.95m/min; Rolling process is divided into roughing and finish rolling two-phase control rolling, rough rolling step takes the large pressing operation of high temperature, roughing start rolling temperature controls at 1150 DEG C, single pass draft controls 16.7%, optimizes intermediate blank design, when product thickness h controls at 45mm, workpiece thickness controls between 2.0h, finish rolling start rolling temperature controls at 890 DEG C, finishing temperature control at 830 DEG C, wait return red to 680 DEG C after to roll off the production line cooling; Steel plate cooling in heap, to roll off the production line temperature 355 DEG C for the product thickness steel plate that is 35mm.
6. production technique according to claim 1, is characterized in that: all alloys and slag charge all fully need toast at the bakery of 50 DEG C; In hot metal pre process procedures, converter is made to enter S:0.010% in stove molten iron; In LF refining procedure, in converter tapping process, slag charge adds by 10kg steel per ton, controls sulphur content S:0.005%, and pure calcium line is according to the feeding of 180m/ stove, and feeding is quiet afterwards stirs 12min; In RH refining procedure, strand in rolling process requires rolled sheet material thickness >=60mm or rolling reduction≤10 on-line shearing plate, this strand needs to enter RH refining procedure, vacuum tightness: 5.0mbar is required during Steel Plate Vacuum process, hold-time: 14min, pure calcium line is according to the feeding of 180m/ stove, and feeding is quiet afterwards stirs 12min; In continuous casting working procedure, constant pulling rate 1.0m/min; Rolling process is divided into roughing and finish rolling two-phase control rolling, rough rolling step takes the large pressing operation of high temperature, roughing start rolling temperature controls at 1200 DEG C, single pass draft controls 19.8%, optimizes intermediate blank design, when product thickness h controls at 55mm, workpiece thickness controls between 1.8h, finish rolling start rolling temperature controls at 870 DEG C, finishing temperature control at 830 DEG C, wait return red to 680 DEG C after to roll off the production line cooling; Steel plate cooling in heap, to roll off the production line temperature 360 DEG C for the product thickness steel plate that is 50mm.
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| CN104018064B (en) * | 2014-06-18 | 2016-08-17 | 内蒙古包钢钢联股份有限公司 | The production method of low cost Q345R steel plate |
| CN108330431A (en) * | 2018-03-09 | 2018-07-27 | 泰州市大明不锈钢有限公司 | A kind of stainless-steel sheet production technology |
| CN110846585B (en) * | 2019-10-28 | 2021-09-17 | 南京钢铁股份有限公司 | Q345C steel plate for railway bogie and manufacturing method thereof |
| CN115369302A (en) * | 2022-08-03 | 2022-11-22 | 新疆八一钢铁股份有限公司 | Production method of Q235-T steel plate for papermaking roller |
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| JPS63213620A (en) * | 1987-03-02 | 1988-09-06 | Nkk Corp | Manufacture of high strength steel pipe joint |
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