CN103911544A - Low alloy structural steel with low cost and thick specification and production method thereof - Google Patents
Low alloy structural steel with low cost and thick specification and production method thereof Download PDFInfo
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Abstract
The invention discloses low alloy structural steel with low cost and thick specification. The low alloy structural steel comprises the following components by weight percent: 0.17%-0.20% of C, 0.15%-0.30% of Si, 0.35%-0.55% of Mn, less than or equal to 0.025% of P, less than or equal to 0.01% of S, less than or equal to 0.008% of N, and the rest of Fe and inevitable impurities. A production method of the structural steel comprises the following steps: (1) continuous casting to obtain billet; (2) soaking the cast billet; (3) high-pressure descaling, and finish rolling, wherein the sum of reduction rates of F1 and F2 is greater than or equal to 98% and is less than or equal to 105%, and F1 and F2 cooling water amount is 70%-80% of normal water amount, F3 or F4 is nominal, and the outlet temperature is 840-870 DEG C; (4) setting the laminar flow cooling speed to be 40-83 DEG C/s, the coiling temperature to be 540-570 DEG C, and the head coiling temperature to be 580-600 DEG C; (5) cooling. The production method disclosed by the invention basically eliminates phenomena such as mixed crystal and cold bending cracking, has good coiling shape, and is suitable for being widely applied to the field of steel production.
Description
Technical field
The present invention relates to technical field of steel production, refer to particularly a kind of low cost thick specification low-alloy structure and production method thereof.
Background technology
The CSP of domestic large-scale iron and steel enterprise is produced the CSP of employing (Compact Strip Production more now, compact output strip line) production line, this production line generally comprises two 150 tons of converters, two LF (Ladle Refining Furnace, ladle refining furnace) refining furnace, RH refining furnace, double-current sheet blank continuous casting line, tunnel heating and seven frame hot continuous mills.It is 1680mm that casting machine is produced maximum strand width, and thickness is two kinds of 70mm, 90mm, and this casting machine has band liquid center cast rolling function, and the thick strand of 70mm can casting arrive 52mm, and the thick strand of 90mm can casting arrive 70mm, and scooter 5～6m/min is drawn in the design effort of casting machine.The year design production capacity of the CSP production line hot rolled strip of latest domestic is 2,500,000 t, wherein, be 54.2 ten thousand t for hot rolling acid-cleaning galvanization roll, silicon steel stock roll 97.8 ten thousand t, hot rolling direct-furnish volume 980,000 t, the steel grade of production comprises: structural carbon steel, quality carbon steel, Hi-Stren steel, weatherproof structure steel, automobile structural steel, pipe line steel, ultra low-carbon steel, non orientating silicon steel, low-carbon cold rolling base-material are with steel etc.Compare with domestic and international similar sheet billet continuous casting and rolling production line, domestic CSP production line reaching product level, reach and in product speed and quality control, realized new breakthrough.
At present, Q235B steel grade is main force's product of domestic CSP production line, and along with the development in strip market, low alloy steel Q345B also presents good sales momentum on strip market.But the Mn content of current Q345B steel grade reaches 1.2～1.35%, and cost of alloy is still higher, be the competitive power on market or the benefit to production line all has a strong impact on to this product.Owing to can obviously reduce cost of alloy and organization of production difficulty on variety development, flexible rolling technology looks forward to starting to be promoted at each large steel.For the production status of low alloy steel Q345B, more domestic large-scale iron and steel enterprises start to consider the composition by optimizing Q235B, and be equipped with low temperature cooling controlling and rolling controlling process and realize structure refinement and the strengthening of steel, make Q235B steel grade production line flexible rolling go out low alloy steel Q345B, this is significant to reduction strip cost of alloy, raising product competitiveness.At present, successfully produce the thin specification Q345B below 3.0mm on Q235B production line, Mn content is also reduced to 0.5% left and right by original 1.2～1.35%.
But also there are the following problems in the production of low cost (Mn the is reduced to 0.5% left and right) thick specification low-alloy structure of the above specification of 4.0mm:
1) unstable properties, conforming product rate is only 85%, because the effect of Mn in steel is mainly solution strengthening effect, so solution strengthening effect reduces after Mn falls in low cost low alloy steel.Simultaneously, because CSP produces line feature, the compression of heavy gauge steel strip is smaller, the original columnar grain fragmentation of strand is thorough not, finished product crystal grain is comparatively thick and not of uniform size, structure property control is unstable, and performance inconsistency is even a generation, referring to the grain structure structure iron of Q345B comparative example in the parameters such as yield strength value, tensile strength values, yield tensile ratio and the unit elongation of Q345B comparative example in table 1 and Fig. 1.
2) mixed crystal phenomenon and cold bend cracking problem, come out of the stove and low temperature rolling because adopting low temperature, F3 (Finish Mill, the English free translation of finish rolling, the F3 of this place refers to the 3rd hot rolls, and F4 refers to all the people present's hot rolls) or lower temperature and the draft of F4 passage, the generation of finished strip mixed crystal phenomenon caused, affect the control of tissue, and finally affect client's cold roll forming performance.Part low cost low alloy steel produces cold bend cracking phenomenon, and specification is thicker, and cold bend cracking probability is more obvious, affects image product and the customer trust degree of CSP production line, referring to the grain structure structure iron of Q345B comparative example in Fig. 1.
3) scroll problem, main finger tower and head bleeding edge problem, reason has two: 1. because low temperature finish to gauge and low temperature batch, speed of cooling is large easily to be produced inhomogeneously, and head plate shape is controlled poor, thereby easily produces head turriform; 2. be with steel head out-of-shape, simultaneous temperature is lower, and the detection of impact with steel head tracking signal, affects the action of head side guide plate and the action of pinch roll, thereby produces head turriform and head bleeding edge; Problems easily causes steel coil handling damage to cut damage, and serious entire volume is sentenced useless, affects the lumber recovery of product, not only increase cost of labor, and have influence on logistics delivery and contract is cashed, be unfavorable for the raising of product competitiveness, referring to the scroll schematic diagram of Q345B comparative example in Fig. 2.
Because of the problems referred to above, the tackling key problem progress of thick specification low cost structural low alloy steel more than 4.0mm is not obvious, and Mn content is also only reduced to 0.8%, coordinates processing parameter to produce in batches.
Summary of the invention
Object of the present invention be exactly to provide that a kind of stable performance, product strength and quality product are high, lumber recovery is high, basically eliminate mixed crystal and cold bend cracking phenomenon, low cost thick specification low-alloy structure and production method thereof that scroll is good.
For achieving the above object, the low cost thick specification low-alloy structure that the present invention is designed, it is characterized in that: in described structure iron, the weight percent of each component is: C:0.17～0.20%, Si:0.15～0.30%, Mn:0.35～0.55%, P≤0.025%, S≤0.01%, N≤0.008%, all the other are Fe and inevitable impurity.
As preferred version, in described structure iron, the weight percent of each component is: C:0.18～0.19%, Si:0.17～0.21%, Mn:0.39～0.50%, P:0.016～0.023%, S:0.0062～0.0095%, N:0.0051～0.0072%, all the other are Fe and inevitable impurity.
Again further, in described structure iron, the weight percent of each component is: C:0.18%, and Si:0.19%, Mn:0.45%, P:0.020%, S:0.0080%, N:0.0060%, all the other are Fe and inevitable impurity.
For achieving the above object, the production method of the designed low cost thick specification low-alloy structure of the present invention, comprises the following steps: 1) smelting, external refining and continuous casting become base; 2) strand is carried out to soaking, strand tapping temperature is controlled to 1080～1130 DEG C; 3) slab carries out finish rolling after coming out of the stove after high pressure descaling, finished product thickness is controlled to 4～8mm, 98%≤F1+F2 (Finish Mill, the English free translation of finish rolling, the F1 of this place refers to First hot rolls, F2 refers to second hot rolls) draft sum≤105%, meanwhile, the roll cooling water amount of F1 and F2 is 600～630m
370%～80% of/hour normal water yield, illusory F3 in the time of 4mm≤finished product thickness < 5mm, finished product thickness is illusory F4 frame while being 5～8mm, and finish rolling temperature out is 840～870 DEG C; 4) after finish rolling, carry out laminar flow, the cooling employing leading portion of laminar flow Cooling Mode is in conjunction with the head ladder type of cooling, and speed of cooling is controlled at 40～83 DEG C/sec, after laminar flow, batch, coiling temperature is controlled at 540～570 DEG C, and wherein, band steel head 5～10m coiling temperature is 580～600 DEG C; 5) after cooling, can obtain low cost thick specification low-alloy structure.
As preferred version, described step 2) in, strand tapping temperature is controlled at 1100～1120 DEG C; Described step 3) in, draft sum≤104% of 99%≤F1+F2, the roll cooling water amount of F1 and F2 is 610～620m
372%～78% of/hour normal water yield, finish rolling temperature out is 850～860 DEG C; Described step 4) in, speed of cooling is controlled at 43.8～64.8 DEG C/sec, and coiling temperature is controlled at 550～565 DEG C, and wherein, band steel head 6～8m coiling temperature is 585～594 DEG C.
Further, described step 2) in, strand tapping temperature is controlled at 1110 DEG C; Described step 3) in, the draft sum of F1+F2 is that the roll cooling water amount of 102%, F1 and F2 is 615m
375% of/hour normal the water yield, finish rolling temperature out is 855 DEG C; Described step 4) in, speed of cooling is controlled at 56.7 DEG C/sec, and coiling temperature is controlled at 560 DEG C, and wherein, band steel head 7m coiling temperature is 590 DEG C.
Again further, described step 1) in, thickness of strand is 70mm.
Principle of work of the present invention is such:
1) stable performance, conforming product rate is high: by increasing the draught of front passage, produce complete high temperature austenite recrystallize, be conducive to broken original strand column crystal, refine austenite grain-size.Illusory by F3 or F4 frame, in the situation that overall compression ratio is constant, increase single pass draught, increase the draft of non-recrystallization zone, make austenite crystal flattening, the accumulation of defect concentration in distortion accumulation refine austenite crystal grain by crystal grain and austenite, refinement ferrite crystal grain after phase transformation, ensured the realization of low cost thick specification low-alloy structure performance.
2) eliminating mixed crystal and cold bend cracking phenomenon: F1 and F2 cooling water of working roll suitably reduces, avoid rolled piece surface, distorted area temperature drop obvious, simultaneously F3 or F4 frame are illusory, have avoided the mixed crystal phenomenon causing in the rolling of part recrystallization zone to occur, basically eliminate cold bend cracking phenomenon.
Scroll improves: the cooling employing head of laminar flow ladder process for cooling, head 5～10m batches with comparatively high temps, avoid causing because head cooling rate is excessive thermal stresses excessive and then have influence on template control and strip tracking signal detection, in ensureing head scroll, ensure the detection with steel head tracking signal, so that the timely action of plate rolling side guide and pinch roll ensures that scroll is qualified.
In sum, the invention has the advantages that: the invention solves that the Properties Control that CSP production line thick specification low-alloy structure exists is unstable, tissue exists the bad problems of scroll such as mixed crystal or cold bend cracking, winding unit tower, bleeding edge, be conducive to crystal grain thinning, improve the stability of product performance, obtained comparatively refinement of grain-size at CSP production line, performance index are stablized good thick specification low-alloy structure, properties percent of pass reaches more than 99.8%, basically eliminate the mixed crystal phenomenon of thick specification low-alloy structure, improved cold roll forming performance.Meanwhile, the winding unit tower and the bleeding edge problem that cause because of technological problems are also resolved, and Mn content is also reduced to 0.5% left and right, has further reduced cost of alloy, and product per ton reduces cost of alloy more than 20 yuan.
Brief description of the drawings
Fig. 1 is the grain structure structure iron of the thick specification structural alloy steel comparative example of prior art production;
Fig. 2 is the scroll structural representation of the thick specification structural alloy steel of prior art production;
Fig. 3 is the grain structure structure iron of embodiment 4 in low cost thick specification low-alloy structure of the present invention;
Fig. 4 is the coiling process schematic diagram of embodiment 4 in low cost thick specification low-alloy structure of the present invention;
Fig. 5 is the scroll structural representation of low cost thick specification low-alloy structure of the present invention.
Embodiment
Below in conjunction with specific embodiments and the drawings, the present invention is described in further detail, and the parameter comparison of the comparative example of each embodiment and prior art refers to and is attached to table 1 below:
In Fig. 1 to Fig. 2, thick specification structural alloy steel existing description in background technology under prior art condition, does not repeat them here.
Embodiment 1:
The low cost thick specification low-alloy structure that the present embodiment is produced, is made up of the component of following weight percent: C:0.17%, Si:0.21%, Mn:0.35%, P:0.02%, S:0.0062%, N:0.0053%, all the other are Fe and inevitable impurity, thickness is 4.0mm.
The production method of low cost thick specification low-alloy structure, comprises the following steps:
1) smelting, external refining and continuous casting become base, and thickness of strand is 70mm;
2) strand is carried out to soaking, strand tapping temperature is controlled to 1130 DEG C;
3) slab carries out finish rolling after coming out of the stove after high pressure descaling, and finished product thickness is 6mm, and the draft sum of F1+F2 is that the roll cooling water water yield of 105%, F1 and F2 is 480m
3/ hour, illusory F4 frame, finish rolling temperature out is 870 DEG C;
4) after finish rolling, carry out laminar flow, laminar flow is cooled to leading portion Cooling Mode in conjunction with the head ladder type of cooling, and speed of cooling reaches 82.76 DEG C/sec, and coiling temperature is at 570 DEG C.Band steel head 10m coiling temperature is 600 DEG C.
Embodiment 2:
The low cost thick specification low-alloy structure that the present embodiment is produced, is made up of the component of following weight percent: C:0.19%, Si:0.17%, Mn:0.45%, P:0.018%, S:0.008%, N:0.006%, all the other are Fe and inevitable impurity, thickness is 7.0mm.
The production method of low cost thick specification low-alloy structure, comprises the following steps:
1) smelting, external refining and continuous casting become base, and thickness of strand is 70mm;
2) strand is carried out to soaking, controlling strand tapping temperature is 1100 DEG C;
3) slab carries out finish rolling after coming out of the stove after high pressure descaling, and finished product thickness is 4mm, and the draft sum of F1+F2 is that the roll cooling water water yield of 102%, F1 and F2 is 488m
3/ hour, illusory F3 frame, finish rolling temperature out is 850 DEG C;
4) after finish rolling, carry out laminar flow, the cooling employing leading portion of laminar flow Cooling Mode is in conjunction with the head ladder type of cooling, and speed of cooling reaches 56.7 DEG C/sec, and coiling temperature is at 560 DEG C.Band steel head 10m coiling temperature is 600 DEG C.
Embodiment 3:
The low cost thick specification low-alloy structure that the present embodiment is produced, is made up of the component of following weight percent: C:0.20%, Si:0.15%, Mn:0.5%, P:0.023%, S:0.01%, N:0.0051%, all the other are Fe and inevitable impurity, thickness is 6.0mm.
The production method of low cost thick specification low-alloy structure, comprises the following steps:
1) smelting, external refining and continuous casting become base, and thickness of strand is 70mm;
2) strand is carried out to soaking, strand tapping temperature is controlled to 1120 DEG C;
3) slab carries out finish rolling after coming out of the stove after high pressure descaling, and finished product thickness is 4mm, and the draft sum of F1+F2 is that the roll cooling water water yield of 104%, F1 and F2 is 434m
3/ hour, illusory F3 frame, finish rolling temperature out is 850 DEG C;
4) after finish rolling, carry out laminar flow, the cooling employing leading portion of laminar flow Cooling Mode is in conjunction with the head ladder type of cooling, and speed of cooling reaches 61.2 DEG C/sec, and coiling temperature is at 560 DEG C.Band steel head 5m coiling temperature is 600 DEG C.
Embodiment 4:
The low cost thick specification low-alloy structure that the present embodiment is produced, is made up of the component of following weight percent: C:0.18%, Si:0.3%, Mn:0.42%, P:0.025%, S:0.007%, N:0.0072%, all the other are Fe and inevitable impurity, thickness is 8.0mm.
The production method of low cost thick specification low-alloy structure, comprises the following steps:
1) smelting, external refining and continuous casting become base, and thickness of strand is 70mm;
2) strand is carried out to soaking, strand tapping temperature is controlled to 1100 DEG C;
3) slab carries out finish rolling after coming out of the stove after high pressure descaling, and finished product thickness is 4mm, and the draft sum of F1+F2 is that the roll cooling water water yield of 99%, F1 and F2 is 441m
3/ hour, illusory F3 frame, finish rolling temperature out is 840 DEG C;
4) after finish rolling, carry out laminar flow, the cooling employing leading portion of laminar flow Cooling Mode is in conjunction with the head ladder type of cooling, and speed of cooling reaches 43.8 DEG C/sec, coiling temperature (Coil Temperature, be the CT in Fig. 4) at 540 DEG C, band steel head 5m coiling temperature is 590 DEG C.
Referring to Fig. 3, from low cost thick specification low-alloy structure of the present invention, the grain structure structure iron of embodiment 4 can be found out, crystal grain is thin and even, has eliminated mixed crystal phenomenon, has clear improvement with respect to the grain structure figure of Fig. 1.
Referring to Fig. 4, from low cost thick specification low-alloy structure of the present invention, the coiling process figure of embodiment 4 can find out, coiling temperature with steel head is higher than the coiling temperature with other parts of steel, head batches with comparatively high temps, can avoid causing because head cooling rate is excessive thermal stresses excessive and then have influence on template control and strip tracking signal detection, in ensureing head scroll, ensure the detection with steel head tracking signal, the timely action of being convenient to plate rolling side guide and pinch roll ensures that scroll is qualified.
Referring to Fig. 5, from low cost thick specification low-alloy structure of the present invention, the grain structure structure iron of embodiment 4 can be found out, has solved the winding unit tower and the bleeding edge problem that in Fig. 2, cause because of technological problems, and scroll is improved.
Embodiment 5:
The low cost thick specification low-alloy structure that the present embodiment is produced, is made up of the component of following weight percent: C:0.18%, Si:0.21%, Mn:0.39%, P:0.016%, S:0.0095%, N:0.0058%, all the other are Fe and inevitable impurity, thickness is 5.0mm.
The production method of low cost thick specification low-alloy structure, comprises the following steps:
1) smelting, external refining and continuous casting become base, and thickness of strand is 70mm;
2) strand is carried out to soaking, controlling strand tapping temperature is 1120 DEG C;
3) slab carries out finish rolling after coming out of the stove after high pressure descaling, and finished product thickness is 8mm, and the draft sum of F1+F2 is that the roll cooling water water yield of 105%, F1 and F2 is 462m
3/ hour, illusory F4 frame, finish rolling temperature out is 860 DEG C;
4) after finish rolling, carry out laminar flow, the cooling employing leading portion of laminar flow Cooling Mode is in conjunction with the head ladder type of cooling, and speed of cooling reaches 64.8 DEG C/sec, and coiling temperature is at 560 DEG C, and band steel head 10m coiling temperature is 590 DEG C.
The mechanical property contrast of table 1 embodiment and comparative example
Claims (7)
1. a low cost thick specification low-alloy structure, it is characterized in that: in described structure iron, the weight percent of each component is: C:0.17～0.20%, Si:0.15～0.30%, Mn:0.35～0.55%, P≤0.025%, S≤0.01%, N≤0.008%, all the other are Fe and inevitable impurity.
2. low cost thick specification low-alloy structure according to claim 1, it is characterized in that: in described structure iron, the weight percent of each component is: C:0.18～0.19%, Si:0.17～0.21%, Mn:0.39～0.50%, P:0.016～0.023%, S:0.0062～0.0095%, N:0.0051～0.0072%, all the other are Fe and inevitable impurity.
3. low cost thick specification low-alloy structure according to claim 2, it is characterized in that: in described structure iron, the weight percent of each component is: C:0.18%, Si:0.19%, Mn:0.45%, P:0.020%, S:0.0080%, N:0.0060%, all the other are Fe and inevitable impurity.
4. a production method for low cost thick specification low-alloy structure described in claim 1, comprises the following steps:
1) smelting, external refining and continuous casting become base;
2) strand is carried out to soaking, strand tapping temperature is controlled to 1080～1130 DEG C;
3) slab carries out finish rolling after coming out of the stove after high pressure descaling, and finished product thickness is controlled to 4～8mm, draft sum≤105% of 98%≤F1+F2, and meanwhile, the roll cooling water amount of F1 and F2 is 600～630m
370%～80% of/hour normal water yield, illusory F3 in the time of 4mm≤finished product thickness < 5mm, finished product thickness is illusory F4 frame while being 5～8mm, and finish rolling temperature out is 840～870 DEG C;
4) after finish rolling, carry out laminar flow, the cooling employing leading portion of laminar flow Cooling Mode is in conjunction with the head ladder type of cooling, and speed of cooling is controlled at 40～83 DEG C/sec, after laminar flow, batch, coiling temperature is controlled at 540～570 DEG C, and wherein, band steel head 5～10m coiling temperature is 580～600 DEG C;～with～unify.
5) after cooling, can obtain low cost thick specification low-alloy structure.
5. the production method of low cost thick specification low-alloy structure according to claim 4, is characterized in that: described step 2) in, strand tapping temperature is controlled at 1100～1120 DEG C; Described step 3) in, draft sum≤104% of 99%≤F1+F2, the roll cooling water amount of F1 and F2 is 610～620m
372%～78% of/hour normal water yield, finish rolling temperature out is 850～860 DEG C; Described step 4) in, speed of cooling is controlled at 43.8～64.8 DEG C/sec, and coiling temperature is controlled at 550～565 DEG C, and wherein, band steel head 6～8m coiling temperature is 585～594 DEG C.
6. the production method of low cost thick specification low-alloy structure according to claim 5, is characterized in that: described step 2) in, strand tapping temperature is controlled at 1110 DEG C; Described step 3) in, the draft sum of F1+F2 is that the roll cooling water amount of 102%, F1 and F2 is 615m
375% of/hour normal the water yield, finish rolling temperature out is 855 DEG C; Described step 4) in, speed of cooling is controlled at 56.7 DEG C/sec, and coiling temperature is controlled at 560 DEG C, and wherein, band steel head 7m coiling temperature is 590 DEG C.
7. according to the production method of low cost thick specification low-alloy structure described in any one in claim 4 to 6, it is characterized in that: described step 1) in, thickness of strand is 70mm.
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| CN106119710A (en) * | 2016-07-15 | 2016-11-16 | 上海宝钢包装钢带有限公司 | Middle high-strength steel strip for packaging and preparation method thereof |
| CN106244921A (en) * | 2016-08-30 | 2016-12-21 | 武汉钢铁股份有限公司 | A kind of method producing line employing rolling in ferrite domains production mild steel at CSP |
| CN106834640A (en) * | 2017-03-07 | 2017-06-13 | 华北理工大学 | A kind of manufacture method of low-alloy structural steel hot rolled steel plate |
| CN111889513A (en) * | 2020-06-30 | 2020-11-06 | 武汉钢铁有限公司 | Thin slab continuous casting and rolling dummy rolling method and control system thereof |
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| CN103911544B (en) | 2016-03-30 |
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