CN105132828A - Extra-thick and high-strength-and-tenacity structural steel plate used for bridge and preparation method of structural steel plate - Google Patents
Extra-thick and high-strength-and-tenacity structural steel plate used for bridge and preparation method of structural steel plate Download PDFInfo
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Abstract
The invention belongs to the technical field of metal materials and particularly relates to an extra-thick and high-strength-and-tenacity structural steel plate used for a bridge and a preparation method of the structural steel plate. The extra-thick and high-strength-and-tenacity structural steel plate used for the bridge is composed of, by weight, 0.06-0.10% of carbon, 0.20-0.35% of silicon, 1.40-1.60% of manganese, 0.012% of phosphorus or less, 0.005% of sulfur or less, 0.15-0.25% of chrome, 0.010-0.025% of titanium, 0.020-0.050% of aluminum, 0.030-0.050% of niobium, 0.15-0.25% of nickel and the balance iron and inevitable impurities. The structural steel plate alloy is low in cost, the tensile strength reaches over 540 MPa, the cost is low, and the welding performance is good; meanwhile, the preparation method adopts converter steel smelting in cooperation with thermal mechanical control processing (TMCP) as well as temper heat treatment, so that the tensile strength of the prepared structural steel plate reaches over 540 MPa, and the ballistic work (in the longitudinal direction) of -40 DEG C AKV is equal to or higher than 120 J.
Description
Technical field
The invention belongs to the technical field of metallic substance, be specifically related to tough structural steel for bridge plate of a kind of special thick height and preparation method thereof.
Background technology
Bridge steel plate is steel grade the tightest to performance requriements in engineering steel, involves the important factor such as bridge life, weight capacity.Bridge common steel comprises structural steel for bridge, concrete reinforcing bars, drag-line steel wire and all kinds of structural shapes.At present due to the enforcement of new round infrastructure investment plan, China, by the bridge construction building huge sea-crossing engineering such as crossing over straits, Bohai Sea Gulf, entrance of Changjiang River, Hangzhou Wan, the mouth of the Zhujiang River, the Taiwan Straits and Qiongzhou Strait and build under zanjon valley, snow-coated plateau, loess plateau, Gobi Region, desert particular surroundings, needs the high performance structures steel of higher category could meet structure stress requirement; Meanwhile, for reducing weld seam and node, the demand for the high strength bridge plate of super thick ultra-wide increases day by day.
The tough structural steel for bridge service condition of special thick height is harsh complicated, must have excellent over-all properties.To the index such as high-strong toughness energy, non-deformability under purity of steel, internal soundness, low temperature, there is strict requirement.Steel plate heat-treats to obtain required structure and properties after rolling.But treatment process parameter is different because composition is different with performance requriements, in order to make steel plate reach required optimum performance, how seeking obtaining optimum treatment process parameter becomes problem demanding prompt solution, has higher difficulty in production process.
Summary of the invention
The object of the invention is to the high performance bridge steel for the super thick ultra-wide of present bridge construction development need, high tough, anti-breaking property, life-span length, good weldability and tough structural steel for bridge plate of a kind of special thick height and preparation method thereof is provided, the thick height of described spy is tough, and structural steel for bridge plate thickness specification reaches 80mm, this structural steel and iron cost of alloy is low, tensile strength reaches more than 540MPa, with low cost, welding property is excellent.Described preparation method adopts converter smelting to work in coordination with TMCP+ tempering heat treatment simultaneously, makes the tensile strength of the structural steel and iron preparing gained reach more than 540MPa, ballistic work (longitudinal direction)-40 DEG C of AKV, >=120J.
Technical scheme of the present invention is: the tough structural steel for bridge plate of a kind of special thick height, be grouped into by the one-tenth of following weight percent: carbon 0.06 ~ 0.10%, silicon 0.20 ~ 0.35%, manganese 1.40 ~ 1.60%, phosphorus≤0.012%, sulphur≤0.005%, chromium 0.15 ~ 0.25%, titanium 0.010 ~ 0.025%, aluminium 0.020 ~ 0.050%, niobium 0.030 ~ 0.050%, nickel 0.15 ~ 0.25%, surplus is iron and inevitable impurity.
The thick height of described spy is tough structural steel for bridge plate, be grouped into by the one-tenth of following weight percent: carbon 0.07 ~ 0.10%, silicon 0.20 ~ 0.35%, manganese 1.45 ~ 1.60%, phosphorus≤0.010%, sulphur≤0.005%, chromium 0.15 ~ 0.25%, titanium 0.010 ~ 0.024%, aluminium 0.020 ~ 0.050%, niobium 0.040 ~ 0.050%, nickel 0.15 ~ 0.25%, surplus is iron and inevitable impurity.
The thick height of described spy is tough structural steel for bridge plate, is grouped into by the one-tenth of following weight percent: carbon 0.08%, silicon 0.25%, manganese 1.50%, phosphorus 0.009%, sulphur 0.003%, chromium 0.20%, titanium 0.017%, aluminium 0.030%, niobium 0.045%, nickel 0.20%, surplus is iron and inevitable impurity.
The thickness of described structural steel and iron is 80mm.
A preparation method for the thick height of described spy is tough structural steel for bridge plate, comprises the following steps: (1) molten iron pretreatment desulfurizing, dephosphorization; (2) converter smelting and deoxidation alloying; (3) LF+VD/RH refining; (4) sheet billet continuous casting; (5) slab stacking slow cooling and reheating; (6) dephosphorize by high pressure water; (7) slab rolling; (8) steel plate stacking slow cooling; (9) TMCP+ tempering heat treatment; Described step (2) converter smelting terminal carbon content target is 0.06 ~ 0.10%, P≤0.008%, and tapping temperature target is 1600 ~ 1630 DEG C; Adopt the two slag-stopping tapping of floating plug, scum rod; Tapping process adds aluminium ferromanganese, lime, fluorite make top slag; Adding silicomanganese successively, aluminium ferromanganese, ferrochrome, vanadium iron carry out deoxidation alloying, is 10 ~ 15 minutes in CAS argon blowing time after tapping; Described step (3) LF+VD/RH refining carries out dark desulfurization at LF refining furnace, adds fine setting alloy according to composition, finely tunes to target, after heating terminates, add ferrotianium to each alloying element; Carry out Fruit storage at VD/RH stove, vacuum tightness is not more than 1.5mbar, fidelity sky 15 ~ 20min, feeds calcium iron wire, soft argon blowing time >=15min after line feeding after process terminates.
Described step (9) TMCP+ tempering heat treatment concrete steps are: a. finish-rolling process: start rolling temperature≤900 DEG C, finishing temperature 860 ~ 790 DEG C; B. process for cooling: open cold temperature > 760 DEG C, speed of cooling 6 ~ 15 DEG C/s, final cooling temperature 600 ~ 680 DEG C; C. steel plate tempering temperature 500 ~ 700 DEG C, time inside furnace 1.0 ~ 3.0min/mm, tempering insulation time 80 ~ 240min, steel plate come out of the stove after air cooling.
Described step (1) molten iron pretreatment desulfurizing, dephosphorization: make wherein sulphur take off to 0.002-0.005%, the bright face of molten iron is greater than 90% through KR dark desulfurization pre-treatment and after skimming, molten iron temperature 1250 ~ 1350 DEG C, arsenic (As)≤0.006% in molten iron; Described step (4) sheet billet continuous casting: pulling speed of continuous casting 0.8 ~ 1.5m/min, full argon shield casting, process nitrogen pick-up is not more than 0.0015%; Described step (5) slab stacking slow cooling and reheating: to continuously cast bloom stacking slow cooling more than 48 hours, ensures the precipitation of hydrogen and the homogenizing of microtexture in steel; Heat afterwards, heat-up time, after heating, tapping temperature controlled at 1050 ~ 1080 DEG C according to 9 ~ 11min/cm; Described step (7) slab rolling: start rolling temperature 1020 ~ 1080 DEG C, hot stage adds heavy reduction and improves distortion rate of permeation, reduces last pass, finishing temperature 860 ~ 790 DEG C.
Described steel plate tempering temperature is 550 ~ 700 DEG C, and time inside furnace is 1.2 ~ 1.5min/mm, and tempering insulation time is 96 ~ 120min.
Described steel plate tempering temperature is 610 DEG C, and time inside furnace is 2.5min/mm, and tempering insulation time is 200min.
Beneficial effect of the present invention is: structural steel for bridge plate adopts rational chemical composition design that the thick height of spy of the present invention is tough and collaborative on the thermal treatment process of TMCP+ tempering that matches ensure that steel plate has rational microtexture, reach the standard that every mechanical property meets.In described preparation method, rational thermal treatment process ensures that steel plate has uniform microtexture, thus ensures that steel plate has the indexs such as good normal tensile property, low-temperature flexibility, ensures steel plate security in use.
The thick height of described spy is tough, and structural steel for bridge plate thickness specification reaches 80mm, and cost of alloy is low, and tensile strength reaches more than 540MPa, ballistic work (longitudinal direction)-40 DEG C of AKV, >=120J, relative reduction in area is not less than 35%, and this structural steel and iron is with low cost, welding property is excellent.Preparation method provided by the present invention simultaneously, adopts converter smelting to work in coordination with the thermal treatment process of TMCP+ tempering, makes the tensile strength of structural steel and iron reach more than 540MPa.
Accompanying drawing explanation
Fig. 1 is steel plate (thickness 1/4 place, 200 times) the metallographic structure photo in embodiment.
Fig. 2 is steel plate (thickness 1/2 place, 200 times) the metallographic structure photo in embodiment.
Fig. 3 is steel plate (thickness 1/2 place, 200 times) the metallographic structure photo in embodiment.
Embodiment
Below by embodiment, the present invention will be described in detail.
The thick height of described spy is tough structural steel for bridge plate, is grouped into by the one-tenth of following weight percent: carbon 0.06%, silicon 0.24%, manganese 1.46%, phosphorus 0.007%, sulphur 0.001%, chromium 0.18%, titanium 0.017%, aluminium 0.033%, niobium 0.043%, nickel 0.16%, surplus is iron and inevitable impurity.
The thickness of described structural steel and iron is 80mm.
The preparation method of the thick height of described spy is tough structural steel for bridge plate, comprises the following steps:
(1) molten iron pretreatment desulfurizing, dephosphorization: make wherein sulphur take off to 0.003%, the bright face of molten iron is greater than 90%, molten iron temperature 1270 DEG C, arsenic (As) 0.003% in molten iron through KR dark desulfurization pre-treatment and after skimming;
(2) converter smelting and deoxidation alloying: converter smelting terminal carbon content target is 0.07%, P0.006%, S:0.008% tapping temperature target is 1620 DEG C; Adopt the two slag-stopping tapping of floating plug, scum rod; Tapping process adds aluminium ferromanganese, lime, fluorite make top slag; Adding silicomanganese successively, aluminium ferromanganese, ferrochrome, vanadium iron carry out deoxidation alloying, is 13 minutes in CAS argon blowing time after tapping;
(3) LF+VD/RH refining: carry out dark desulfurization at LF refining furnace, temperature of arriving at a station 1530 DEG C, out-station temperature 1650 DEG C.Heat-up time 30min, treatment cycle 58min.Add fine setting alloy according to composition, finely tune to target to each alloying element, after heating terminates, add ferrotianium; Carry out Fruit storage at VD/RH stove, vacuum tightness 0.6mbar, the empty 15min of fidelity, feed calcium iron wire after process terminates, soft argon blowing time 20min after line feeding, soft blow process molten steel face is without exposed;
(4) sheet billet continuous casting: pulling speed of continuous casting 1.1m/min, full argon shield casting, process nitrogen pick-up is not more than 0.0015%;
(5) slab stacking slow cooling and reheating: to continuously cast bloom stacking slow cooling 60 hours, ensure the precipitation of hydrogen and the homogenizing of microtexture in steel; Heat afterwards, 240min, heated rear tapping temperature and controlled at 1070 DEG C heat-up time;
(6) dephosphorize by high pressure water;
(7) slab rolling: start rolling temperature 1020 ~ 1080 DEG C, hot stage adds heavy reduction and improves distortion rate of permeation, reduces last pass, finishing temperature 860 ~ 790 DEG C;
(8) steel plate stacking slow cooling;
(9) TMCP+ tempering heat treatment; A. finish-rolling process: start rolling temperature≤900 DEG C, finishing temperature 860 ~ 790 DEG C; B. process for cooling: open cold temperature 770 DEG C, speed of cooling 12 DEG C/s, final cooling temperature 620 DEG C; C. steel plate tempering temperature 610 DEG C, time inside furnace 2.5min/mm, tempering insulation time 200min, steel plate come out of the stove after air cooling.
Table 1 thickness specification 80mmQ420qE (Z35) performance summary sheet
Table 2 thickness specification 80mmQ420qE (Z35) impacts at each position
Table 3 tempering sample mechanical property
Table 4 inclusion rating result
The present invention can pass through existing techniques in realizing without the technical characteristic described, and does not repeat them here.Certainly; above-mentioned explanation is not limitation of the present invention; the present invention is also not limited in above-mentioned citing, the change that those skilled in the art make in essential scope of the present invention, remodeling, interpolation or replacement, also should belong to protection scope of the present invention.
Claims (9)
1. the tough structural steel for bridge plate of the thick height of spy, it is characterized in that, be grouped into by the one-tenth of following weight percent: carbon 0.06 ~ 0.10%, silicon 0.20 ~ 0.35%, manganese 1.40 ~ 1.60%, phosphorus≤0.012%, sulphur≤0.005%, chromium 0.15 ~ 0.25%, titanium 0.010 ~ 0.025%, aluminium 0.020 ~ 0.050%, niobium 0.030 ~ 0.050%, nickel 0.15 ~ 0.25%, surplus is iron and inevitable impurity.
2. the tough structural steel for bridge plate of special thick height according to claim 1, it is characterized in that, be grouped into by the one-tenth of following weight percent: carbon 0.07 ~ 0.10%, silicon 0.20 ~ 0.35%, manganese 1.45 ~ 1.60%, phosphorus≤0.010%, sulphur≤0.005%, chromium 0.15 ~ 0.25%, titanium 0.010 ~ 0.024%, aluminium 0.020 ~ 0.050%, niobium 0.040 ~ 0.050%, nickel 0.15 ~ 0.25%, surplus is iron and inevitable impurity.
3. the tough structural steel for bridge plate of special thick height according to claim 1, it is characterized in that, be grouped into by the one-tenth of following weight percent: carbon 0.08%, silicon 0.25%, manganese 1.50%, phosphorus 0.009%, sulphur 0.003%, chromium 0.20%, titanium 0.017%, aluminium 0.030%, niobium 0.045%, nickel 0.20%, surplus is iron and inevitable impurity.
4. the tough structural steel for bridge plate of special thick height according to any one of claim 1-3, is characterized in that, the thickness of described structural steel and iron is 80mm.
5. a preparation method for the tough structural steel for bridge plate of special thick height described in claim 1, comprises the following steps: (1) molten iron pretreatment desulfurizing, dephosphorization; (2) converter smelting and deoxidation alloying; (3) LF+VD/RH refining; (4) sheet billet continuous casting; (5) slab stacking slow cooling and reheating; (6) dephosphorize by high pressure water; (7) slab rolling; (8) steel plate stacking slow cooling; (9) TMCP+ tempering heat treatment; It is characterized in that, described step (2) converter smelting terminal carbon content target is 0.06 ~ 0.10%, P≤0.008%, and tapping temperature target is 1600 ~ 1630 DEG C; Adopt the two slag-stopping tapping of floating plug, scum rod; Tapping process adds aluminium ferromanganese, lime, fluorite make top slag; Adding silicomanganese successively, aluminium ferromanganese, ferrochrome, vanadium iron carry out deoxidation alloying, is 10 ~ 15 minutes in CAS argon blowing time after tapping; Described step (3) LF+VD/RH refining carries out dark desulfurization at LF refining furnace, adds fine setting alloy according to composition, finely tunes to target, after heating terminates, add ferrotianium to each alloying element; Carry out Fruit storage at VD/RH stove, vacuum tightness is not more than 1.5mbar, fidelity sky 15 ~ 20min, feeds calcium iron wire, soft argon blowing time >=15min after line feeding after process terminates.
6. the preparation method of the tough structural steel for bridge plate of special thick height according to claim 5, it is characterized in that, described step (9) TMCP+ tempering heat treatment concrete steps are: a. finish-rolling process: start rolling temperature≤900 DEG C, finishing temperature 860 ~ 790 DEG C; B. process for cooling: open cold temperature > 760 DEG C, speed of cooling 6 ~ 15 DEG C/s, final cooling temperature 600 ~ 680 DEG C; C. steel plate tempering temperature 500 ~ 700 DEG C, time inside furnace 1.0 ~ 3.0min/mm, tempering insulation time 80 ~ 240min, steel plate come out of the stove after air cooling.
7. the preparation method of the tough structural steel for bridge plate of special thick height according to claim 5, it is characterized in that, described step (1) molten iron pretreatment desulfurizing, dephosphorization: make wherein sulphur take off to 0.002-0.005%, the bright face of molten iron is greater than 90% through KR dark desulfurization pre-treatment and after skimming, molten iron temperature 1250 ~ 1350 DEG C, arsenic (As)≤0.006% in molten iron; Described step (4) sheet billet continuous casting: pulling speed of continuous casting 0.8-1.5m/min, full argon shield casting, process nitrogen pick-up is not more than 0.0015%; Described step (5) slab stacking slow cooling and reheating: to continuously cast bloom stacking slow cooling more than 48 hours, heat afterwards, heat-up time, after heating, tapping temperature controlled at 1050 ~ 1080 DEG C according to 9 ~ 11min/cm; Described step (7) slab rolling: start rolling temperature 1020 ~ 1080 DEG C, finishing temperature 860 ~ 790 DEG C.
8. the preparation method of the tough structural steel for bridge plate of special thick height according to claim 6, it is characterized in that, described steel plate tempering temperature is 550 ~ 700 DEG C, and time inside furnace is 1.2 ~ 1.5min/mm, and tempering insulation time is 96 ~ 120min.
9. the preparation method of the tough structural steel for bridge plate of special thick height according to claim 6, it is characterized in that, described steel plate tempering temperature is 610 DEG C, and time inside furnace is 2.5min/mm, and tempering insulation time is 200min.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106282789A (en) * | 2016-08-15 | 2017-01-04 | 山东钢铁股份有限公司 | A kind of low-carbon (LC) spy's thickness TMCP type Q420qE bridge steel and manufacture method thereof |
| CN107557690A (en) * | 2016-06-30 | 2018-01-09 | 鞍钢股份有限公司 | The super-thick steel plate and its manufacture method of a kind of low temperature resistant and anti-lamellar tearing |
| CN110284054A (en) * | 2019-06-04 | 2019-09-27 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of high temperature resistant resistance to deformation electrolytic cell steel and preparation method thereof |
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| CN107557690A (en) * | 2016-06-30 | 2018-01-09 | 鞍钢股份有限公司 | The super-thick steel plate and its manufacture method of a kind of low temperature resistant and anti-lamellar tearing |
| CN107557690B (en) * | 2016-06-30 | 2019-03-26 | 鞍钢股份有限公司 | The super-thick steel plate and its manufacturing method of a kind of low temperature resistant and anti-lamellar tearing |
| CN106282789A (en) * | 2016-08-15 | 2017-01-04 | 山东钢铁股份有限公司 | A kind of low-carbon (LC) spy's thickness TMCP type Q420qE bridge steel and manufacture method thereof |
| CN110284054A (en) * | 2019-06-04 | 2019-09-27 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of high temperature resistant resistance to deformation electrolytic cell steel and preparation method thereof |
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Application publication date: 20151209 |