CN102764961A - Technique for manufacturing 150-400mm thick carbon constructional steel plate by using continuous casting slabs - Google Patents
Technique for manufacturing 150-400mm thick carbon constructional steel plate by using continuous casting slabs Download PDFInfo
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- CN102764961A CN102764961A CN2012102640183A CN201210264018A CN102764961A CN 102764961 A CN102764961 A CN 102764961A CN 2012102640183 A CN2012102640183 A CN 2012102640183A CN 201210264018 A CN201210264018 A CN 201210264018A CN 102764961 A CN102764961 A CN 102764961A
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Abstract
The invention discloses a technique for manufacturing a 150-400mm thick carbon constructional steel plate by using continuous casting slabs, belonging to the field of metal materials. The continuous casting slabs subjected to converter steelmaking and secondary refining are used in the technique; and the chemical components of the slabs include 0.14-0.20wt% of C, 0.20-0.50wt% of Si, 0.08-1.40wt% of Mn and less than or equal to 0.010wt% of S; at least two continuous casting slabs subjected to surface machining and cleaning are overlapped, four sides of the continuous casting slabs are combined and welded to form a big-thickness blank, the blank is arranged in a bogie-type furnace or a soaking pit furnace for heating, and then is rolled, water-cooled and subjected to heat treatment after being discharged from the furnace so as to produce the 120-400mm thick carbon constructional steel plate. The technique has the following characteristics of simple production process, high yield, high ultrasonic flaw detection rate of more than 98% and excellent performance.
Description
Technical field
The invention belongs to metal material field, relate to a kind of technology of utilizing continuous casting steel billet to make the thick carbon constructional steel plate of 150-400mm.
Background technology
The thick carbon constructional steel plate of 150-400mm is widely used in national economy fields such as heavy-duty machinery manufacturing, structure processing.Plasticity and toughness that product requirement is good and internal soundness.Receive the restriction of continuous casting material thickness, domestic with the generally the thickest shortcomings such as 150mm generally adopts forms such as static ingot, ESR ingot with upper steel plate to 150mm, and production process exists lumber recovery low, and energy consumption is high, and production efficiency is low of continuous casting billet production guarantor flaw detection guaranteed cost steel plate.
Summary of the invention
The present invention breaks through continuous casting billet sotck thinkness restriction, provides the existing continuous casting steel billet production of a kind of utilization to protect the above thickness structural carbon steel of flaw detection guaranteed cost 150mm plate technique, the guarantor that can produce maximum ga(u)ge and the be 400mm thick carbon junction steel plate of guaranteed cost spy of detecting a flaw.
The present invention realizes through following technical scheme: a kind of technology of utilizing continuous casting steel billet to make the thick carbon constructional steel plate of 150-400mm may further comprise the steps:
(1) with (comprise two) more than two all around same size (be that length, width equate; Thickness can be different) continuous casting steel billet be raw material; Used continuous casting steel billet comprise following chemical composition (mass percent, wt%): C 0.14～0.20%, Si 0.20～0.50%; Mn 0.08～1.40%, S≤0.010%;
(2) to three limits of to be welded of all continuous casting steel billets through the flame cutting or the form finished edge such as dig, mill, groove depth 10-40mm, bevel angle 15-35 °; Continuous casting steel billet is stacked together; And half-twist vertically places, and group aligns together, adopts the welding manner of gas shielded arc welding then; Continuous casting steel billet there is the welding that feels secure of limit seam on three faces of groove; Adopt Lincoln weld to fill and cover welding again, at last the limit on the residue face is sewn on and carries out vacuum electron beam under the high vacuum and weld, assembly welding becomes big thickness blank; Perhaps square groove is stacked together continuous casting steel billet, and half-twist vertically places, and group aligns together, all adopts the mode of vacuum electron beam welding that 4 faces are welded into big thickness blank then;
(3) the big thickness blank that connects of butt welding adopts bogie-type furnace or soaking pit to heat, and tapping temperature is controlled at 1160～1300 ℃;
(4) come out of the stove the back rolling, 1050～1150 ℃ of phase I start rolling temperatures, 820～920 ℃ of second stage start rolling temperatures, intermediate blank thickness are not less than 1.4 times of finished product thickness;
(5) carry out weak water-cooled but to rolling the back steel plate, cooling velocity 5 ℃/S, 620～780 ℃ of red temperature are returned on the surface;
(6) steel plate is carried out normalizing heat treatment, 860～950 ℃ of heat treatment temperatures, heat insulating coefficient 1.2～2.0min/mm.
The continuous casting steel billet of said step (1) is the continuous casting steel billet through pneumatic steelmaking, LF and RH external refining, continuous casting working procedure, will carry out vacuum outgas in the said RH external refining operation and handle, and require: vacuum≤100Pa, the dwell time is more than 10 minutes.
Said step (2) continuous casting steel billet through machine-tooled methods such as milling machines, planer, is removed the iron scale of treating composite surface, greasy dirt etc. before its welding, realizes surface cleaning.
Said step (2) gas shielded arc welding, its gage of wire 1.2-2.0mm, weldingvoltage 20-35V, welding current 120-400A, speed of welding 250-600mm/min, dry extension of electrode degree 15-25mm, protective gas CO
2Or Ar+CO
2, shield gas flow rate 15-25L/min, fusion penetration 5-20mm;
Said step (2) Lincoln weld, its gage of wire 4.0-6.0mm, weldingvoltage 30-45V, welding current 250-1600A, speed of welding 250-600mm/min, dry extension of electrode degree 25-45mm, fusion penetration 10-30mm;
The welding of said step (2) vacuum electron beam, its weldingvoltage 30-150KV, vacuum is higher than 1 * 10
-1Pa, welding current 100-500mA, speed of welding 50-700mm/min, fusion penetration 20-50mm.
The present invention utilizes the continuous casting steel billet through pneumatic steelmaking, external refining, its chemical composition as stated, its chemical composition design principle is following: C, Mn are main intensified element, for reducing production costs, are prone under the prerequisite of weldability guaranteeing, C, Mn content are high as far as possible; The S constituent content reduces as far as possible, to reduce the influence to the steel plate internal soundness such as steel inclusion.
Carrying out vacuum outgas in the external refining operation of the present invention handles; Require vacuum≤100Pa, pressurize is more than 10 minutes, its main purpose: the one, for the abundant degassing; Reduce the content of gas such as hydrogen in the steel as far as possible, reduce the influence to the steel plate internal soundness such as hydrogen induced cracking; The 2nd, float as far as possible in order to make the field trash in the molten steel, reduce the content of steel inclusion.
The present invention adopts gas shielded arc welding, submerged-arc welding and electron-bombardment welding assembled welding process, welds together around the blank, and assembly welding becomes big thickness blank; Weld interface place blank is high vacuum state; In the subsequent thermal processing deformation process, very easily seam forms an integral body together; Be consistent with matrix, the big thickness blank that can make full use of formation increases the compression ratio of mill product steel plate.
The big thickness blank that butt welding of the present invention connects adopts bogie-type furnace or soaking pit to heat, and suitably increases the high temperature section temperature retention time, guarantees that steel plate grills thoroughly, burns evenly.
Adopt the two-stage rolling in the operation of rolling of the present invention, the phase I carry out high temperature low speed depress greatly rolling, through recrystallization process crystal grain thinning repeatedly; Second stage adopts controlled rolling, increases phase deformed nucleus point crystal grain thinning, and 1.4 times of finished product thicknesses of intermediate blank are in order to guarantee the cumulative deformation of the two-stage operation of rolling.
The present invention carries out weak water-cooled but to rolling the back steel plate, rolls the back water-cooled and is in order to be cooled to transformation temperature quickly, prevents that crystal grain from too growing up, and low cooling velocity is in order to reduce the structure property difference on the steel plate thickness direction.
The present invention carries out normalizing heat treatment to steel plate, makes the steel plate even tissue, increases the plasticity and toughness and the steel plate thickness direction structure property uniformity of steel plate.
Beneficial effect of the present invention: the 150-400mm carbon constructional steel plate that the present invention produces possesses good comprehensive mechanical properties, and flaw detection qualification rate reaches more than 98%, and Z reaches more than 60% to the stretching contraction percentage of area, and base material yield is more than 85%.Production technology is workable, and cost is low, and production efficiency is high.Especially the assembly welding mode of gas shielded arc welding, submerged-arc welding and electron-bombardment welding has following advantage:
1, the present invention at first adopts the gas shielded arc welding welding that feels secure to three limits seam of continuous casting steel billet group, under the prerequisite of not polluting faying face, accomplishes the basis welding automatically and efficiently, and gets ready for next step submerged-arc welding; Adopt the mode of Lincoln weld to accomplish the filling welding of weld seam apace again to this three limits seam then, will remain a limit at last and be sewn under the vacuum environment and use electron-bombardment welding technique, the final welding of completion blank; Compare four limit electron-bombardment welding techniques and increased substantially welding efficiency.
2, the present invention adopts permanent order to carry out the technology of welding successively; It or not the simple combination of gas shielded arc welding, submerged-arc welding and electron-bombardment welding; But in strict accordance with the inherent quality requirement of thickness slab preparation greatly; Taken into full account the advantage separately of three kinds of welding manners, with the result of its optimum organization.Because can not polluting slab group faying face, gas shielded arc welding can not realize that automation improves welding efficiency simultaneously; Lincoln weld is than a kind of more efficiently welding manner of gas shielded arc welding; And gas shielded arc welding and submerged-arc welding operation are all carried out under home; Need pass in and out vacuum chamber repeatedly during unlike vacuum welding, thereby therefore vacuum pumping has repeatedly significantly reduced the vacuum operation time; This Combination Welding order and mode can increase substantially welding efficiency under the prerequisite that guarantees welding requirements (particularly the cleanliness factor to faying face requires), reduced production cost.
3, therefore the present invention can guarantee to keep the gap about 1mm between the blank, and can not form local closed area because the slab group is the vertical direction placement.Electron-bombardment welding has guaranteed that final being welded in the high vacuum accomplish; Avoided the faying face place to exist the air influence to roll the possibility of back quality; Comparing has vacuum welding technology now, only needs disposable vacuumizing and welding operation, simultaneously because the slab group is the vertical welding of placing; Complicated mechanical mechanism and descending operation have increased substantially welding efficiency when having avoided the level welding.
4, assembly welding technique of the present invention can substitute the manufacturing process under the vacuum environment fully, and the super-thick steel plate internal soundness of being produced is good, and excellent performance reaches the level of vacuum composite rolling technology fully; And compare with vacuum composite rolling technology, simple to operate, the small investment of the present invention, cost reduces more than 80%, and production efficiency is enhanced about more than once, and the organization of production form is flexible, is applicable to mass industrialized production, and the vacuum electron beam welding can't be produced in batches.
Description of drawings
Fig. 1 is the original strand superposed surfaces of the steel plate metallographic structure figure that embodiment 1 produces.
Implement concrete mode
Below in conjunction with concrete embodiment, the manufacturing process of this kind 150-400mm carbon constructional steel plate is described in detail.
Embodiment 1: produce the thick Q235B steel plate of 200mm:
1) the high cleanliness molten steel is smelted, and molten steel carries out the two refinings of LF+RH behind converter smelting, the LF refining fully remove be mingled with, desulfurization, the RH application of vacuum kept vacuum 100Pa totally 14 minutes, the gas after the refining in the molten steel [O] 13ppm, [H] 2ppm.
2) the continuous casting of molten steel process adopts the whole process protection cast, and uses electromagnetic agitation, and the constant speed cast is produced the thick continuous casting billet with scale of 250mm, smelting component analysis result such as following table:
Table 1 embodiment 1 continuous casting billet chemical composition
| Chemical composition | C | Si | Mn | P | S |
| Content wt% | 0.20 | 0.25 | 1.10 | 0.016 | 0.004 |
3) will produce two good thick continuous casting steel billets of 250mm through milling machine processing, remove surperficial iron scale, greasy dirt etc., realize surface cleaning.
4) will accomplish three lateral dominances that the blank of surface cleaning intends solder side with flame cutting method finished edge, groove depth 25mm, 25 ° of bevel angles.
5) blank that processes is stacked together, half-twist is vertically placed, and group aligns together, clamps.
6) welding manner of employing gas shielded arc welding stitches the welding that feels secure, gage of wire 2.0mm, weldingvoltage 20V, welding current 200A, speed of welding 300mm/min, dry extension of electrode degree 25mm, protective gas CO to the limit that has processed groove on three faces of blank
2, shield gas flow rate 20L/min, fusion penetration 15mm.
7) will stitch through three limits after the gas shielded arc welding bottoming welding, and adopt Lincoln weld to fill and cover welding again, gage of wire 5.0mm, weldingvoltage 30V, welding current 400A, speed of welding 350mm/min, dry extension of electrode degree 30mm, fusion penetration 20mm.
8) remaining sides is sewn on employing vacuum electron beam welding under the condition of high vacuum degree, finally forms the big thickness blank of 500mm.Weldingvoltage 100KV, vacuum 1.5 * 10
-2Pa, welding current 300mA, speed of welding 150mm/min, fusion penetration 35mm.
9) adopt car type furnace that 500mm thick stock material is heated, total heat time heating time is more than 12 hours, 1280 ℃ of tapping temperatures.
10) 1120 ℃ of roughing open rollings in the operation of rolling, the thick 300mm of intermediate blank; 880 ℃ of finish rolling start rolling temperatures.
11) roll the back steel plate and carry out weak water-cooled, 4 ℃/S of cooling velocity, cooling back surface of steel plate returns 740 ℃ of red temperature.
12) steel plate carries out normalizing heat treatment, 890 ℃ ± 10 ℃ of heat treatment temperatures, temperature retention time 1.2min/mm.
Utilize the original strand superposed surfaces of steel plate and the matrix of this explained hereafter in full accord, obtained good fusion, as shown in Figure 1.
Embodiment 2: produce the thick Q235B steel plate of 200mm:
1) the high cleanliness molten steel is smelted, and molten steel carries out the two refinings of LF+RH behind converter smelting, the LF refining fully remove be mingled with, desulfurization, the RH application of vacuum kept vacuum 100Pa totally 16 minutes, the gas after the refining in the molten steel [O] 12ppm, [H] 2.1ppm.
2) the continuous casting of molten steel process adopts the whole process protection cast, and uses electromagnetic agitation, and the constant speed cast is produced the thick continuous casting billet with scale of 250mm, smelting component analysis result such as following table 2:
Table 2 embodiment 2 continuous casting billet chemical compositions
| Chemical composition | C | Si | Mn | P | S |
| Content wt% | 0.18 | 0.30 | 1.15 | 0.010 | 0.008 |
3) will produce two good thick continuous casting steel billets of 250mm through milling machine processing, remove surperficial iron scale, greasy dirt etc., realize surface cleaning.
4) blank that processes is stacked together, half-twist is vertically placed and is organized together and aligns.
5) mode that adopts vacuum electron beam to weld is welded the seam of the limit on four faces of blank, forms the big thickness blank of 500mm.Weldingvoltage 150KV, vacuum 1.0 * 10
-2Pa, welding current 200ma, speed of welding 250mm/min, fusion penetration 40mm.
6) adopt soaking pit that 500mm thick stock material is heated, total heat time heating time is more than 12 hours, 1200 ℃ of tapping temperatures.
7) 1150 ℃ of roughing open rollings in the operation of rolling, the thick 500mm of intermediate blank; 820 ℃ of finish rolling start rolling temperatures.
8) roll the back steel plate and carry out weak water-cooled, 4 ℃/S of cooling velocity, cooling back surface of steel plate returns 700 ℃ of red temperature.
9) steel plate carries out normalizing heat treatment, 910 ℃ ± 10 ℃ of heat treatment temperatures, heat insulating coefficient 1.5min/mm.
To embodiment 1 and embodiment 2 steel plates by standard stretch, impact, Z detect to experiments such as, flaw detections, the result is as shown in table 3 below, each item function admirable; The assembly welding mode of the gas shielded arc welding of embodiment 1, submerged-arc welding and vacuum electron beam welding (being called for short the assembly welding mode) is compared with the vacuum electron beam welding mode of embodiment 2; It is as shown in table 4 to vacuumize number of times, production cycle and indicator of power consumption; Can find out from table 4: the assembly welding mode significantly improves than vacuum electron beam welding mode production efficiency, and energy-conservation.
The performance indications of table 3 embodiment 1 and the carbon constructional steel plate of embodiment 2 preparations
Two kinds of welding manner leading indicator contrasts of table 4.
| Technology | Vacuumize number of times | Production cycle (h) | Power consumption (unit/t) |
| Embodiment 2 vacuum electron beam welding modes | 2 | 24 | 31 |
| Embodiment 1 assembly welding mode | 1 | 9 | 19 |
Claims (6)
1. a technology of utilizing continuous casting steel billet to make the thick carbon constructional steel plate of 150-400mm is characterized in that, may further comprise the steps:
(1) continuous casting steel billet with same size around more than two is a raw material, and used continuous casting steel billet comprises following chemical composition: C 0.14～0.20wt%, Si 0.20～0.50wt%, Mn 0.08～1.40wt%, S≤0.010wt%;
(2) to three limit finished edges of to be welded of all continuous casting steel billets, groove depth 10-40mm, bevel angle 15-35 °; Continuous casting steel billet is stacked together; And half-twist vertically places, and group aligns together, adopts the welding manner of gas shielded arc welding then; Continuous casting steel billet there is the welding that feels secure of limit seam on three faces of groove; Adopt Lincoln weld to fill and cover welding again, the limit on the residue face is sewn on carries out the vacuum electron beam welding under the high vacuum at last, assembly welding becomes big thickness blank; Perhaps square groove is stacked together continuous casting steel billet, and half-twist vertically places, and group aligns together, all adopts the mode of vacuum electron beam welding that 4 faces are welded into big thickness blank then;
(3) the big thickness blank that connects of butt welding adopts bogie-type furnace or soaking pit to heat, and tapping temperature is controlled at 1160～1300 ℃;
(4) come out of the stove the back rolling, 1050～1150 ℃ of phase I start rolling temperatures, 820～920 ℃ of second stage start rolling temperatures, intermediate blank thickness are not less than 1.4 times of finished product thickness;
(5) carry out weak water-cooled but to rolling the back steel plate, cooling velocity 5 ℃/S, 620～780 ℃ of red temperature are returned on the surface;
(6) steel plate is carried out normalizing heat treatment, 860～950 ℃ of heat treatment temperatures, heat insulating coefficient 1.2～2.0min/mm.
2. a kind of technology of utilizing continuous casting steel billet to make the thick carbon constructional steel plate of 150-400mm as claimed in claim 1; It is characterized in that; The continuous casting steel billet of said step (1) is the continuous casting steel billet through pneumatic steelmaking, LF and RH external refining, continuous casting working procedure; Will carry out vacuum outgas in the said RH external refining operation and handle, require: vacuum≤100Pa, the dwell time is more than 10 minutes.
3. a kind of technology of utilizing continuous casting steel billet to make the thick carbon constructional steel plate of 150-400mm as claimed in claim 1 is characterized in that, the welding of said step (2) vacuum electron beam, and its weldingvoltage 30-150KV, vacuum is higher than 1 * 10
-1Pa, welding current 100-500mA, speed of welding 50-700mm/min, fusion penetration 20-50mm.
4. like any described a kind of technology of utilizing continuous casting steel billet to make the thick carbon constructional steel plate of 150-400mm among the claim 1-3, it is characterized in that said step (2) is: to three limit finished edges of to be welded of all continuous casting steel billets; Groove depth 10-40mm; Bevel angle 15-35 °, continuous casting steel billet is stacked together, and half-twist is vertically placed; Group aligns together; Adopt the welding manner of gas shielded arc welding then, continuous casting steel billet is had the welding that feels secure of limit seam on three faces of groove, adopt Lincoln weld to fill and cover welding again; At last the limit on the residue face is sewn on and carries out vacuum electron beam under the high vacuum and weld, assembly welding becomes big thickness blank.
5. a kind of technology of utilizing continuous casting steel billet to make the thick carbon constructional steel plate of 150-400mm as claimed in claim 4 is characterized in that said gas shielded arc welding; Its gage of wire 1.2-2.0mm; Weldingvoltage 20-35V, welding current 120-400A, speed of welding 250-600mm/min; Dry extension of electrode degree 15-25mm, protective gas CO
2Or Ar+CO
2, shield gas flow rate 15-25L/min, fusion penetration 5-20mm.
6. a kind of technology of utilizing continuous casting steel billet to make the thick carbon constructional steel plate of 150-400mm as claimed in claim 4 is characterized in that said Lincoln weld; Its gage of wire 4.0-6.0mm; Weldingvoltage 30-45V, welding current 250-1600A, speed of welding 250-600mm/min; Dry extension of electrode degree 25-45mm, fusion penetration 10-30mm.
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| CN105252237A (en) * | 2014-07-16 | 2016-01-20 | 鞍钢股份有限公司 | Method for producing CrMnNiMo series ultra-thick mold compound billets |
| WO2016150024A1 (en) * | 2015-03-26 | 2016-09-29 | 中国科学院金属研究所 | Constructing and forming method for preparing homogenized forge pieces |
| CN106694549A (en) * | 2015-11-17 | 2017-05-24 | 鞍钢股份有限公司 | Method for producing extremely-thick carbon die steel plate |
| CN107253020A (en) * | 2017-05-23 | 2017-10-17 | 舞阳钢铁有限责任公司 | A kind of production method of big thickness 45# steel plates |
| CN108247297A (en) * | 2018-01-17 | 2018-07-06 | 山东钢铁集团日照有限公司 | The preparation process of the compound strand of high tenacity steel plate |
| CN116334467A (en) * | 2023-01-18 | 2023-06-27 | 南京钢铁股份有限公司 | Production method for smelting carbon structural steel at low cost |
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| CN108247297A (en) * | 2018-01-17 | 2018-07-06 | 山东钢铁集团日照有限公司 | The preparation process of the compound strand of high tenacity steel plate |
| CN116334467A (en) * | 2023-01-18 | 2023-06-27 | 南京钢铁股份有限公司 | Production method for smelting carbon structural steel at low cost |
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