CN103938076B - The production method of 500MPa level fork truck gantry-shaped steel - Google Patents
The production method of 500MPa level fork truck gantry-shaped steel Download PDFInfo
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Abstract
The invention discloses a kind of production method of 500MPa level fork truck gantry-shaped steel; the method comprises molten iron pre-desulfurization, converter smelting, LF refining, full guard continuous casting, milling step successively; described 500MPa level fork truck gantry-shaped steel is made up of following chemical composition by weight percentage: C0.24 ~ 0.30%, Si0.15 ~ 0.30%, Mn1.05 ~ 1.30%, P≤0.025%, S≤0.015%, V0.05 ~ 0.08%, and all the other are iron and inevitable impurity.The present invention is mainly through improving carbon content, reduce sulphur, phosphorus content, microalloying is only vanadium, does not add other elements, does not control cold and do not need to heat-treat after rolling, the steel mechanical property obtained is good, yield strength average out to 531MPa, tensile strength average out to 685MPa, unit elongation average out to 23.5%, Brinell hardness is greater than 210,20 DEG C of average 59J of ballistic work.
Description
Technical field
The invention belongs to metallurgical technology field, be specifically related to a kind of production method of 500MPa level fork truck gantry-shaped steel.
Background technology
Fork truck is as the important equipment of logistics system, and its demand constantly increases.And get as the fork of fork truck to goods, be elevated, stack, the door frame that hoists of the operation such as piling, it is most important primary structure member, and door frame is all be suspended on the drive axle in fork truck front, balance weight type front, get, promote and convey goods in operation carrying out fork, centered by front driving axle, produce very large moment.Therefore improve the intensity of portal frame system, the security and stability of door frame not only can be made greatly to improve, portal frame system deadweight can be reduced simultaneously, production material cost is reduced, significantly improves its its usage economy.
In recent years, gantry-shaped steel of forklift conventional in industry has 335MPa, 400MPa, 420MPa and 440MPa equal strength rank, is to a certain degree meeting the manufacture demand of domestic fork truck.But for 3 tons and the following fork truck for exporting, the high 3 grades of door frames that hoist of many employings, for the consideration of fork truck security and stability, some is not enough can to select 420MPa and the 440MPa intensity rank of gantry-shaped steel of forklift in industry, and therefore Forklift Industry urgently develops the 500MPa level shaped steel product being applicable to such fork truck.
Summary of the invention
For the deficiencies in the prior art, the object of the present invention is to provide a kind of production method of 500MPa level fork truck gantry-shaped steel, the steel that the method obtains has high strength and good mechanical properties.
For achieving the above object, present invention employs following technical scheme:
A production method for 500MPa level fork truck gantry-shaped steel, comprises molten iron pre-desulfurization, converter smelting, LF refining, full guard continuous casting, milling step successively, wherein:
In described molten iron pre-desulfurization step, after desulfurization, ensure that Sulfur Content in Hot Iron content is≤0.010wt%;
In described converter smelting step, adopt top and bottom combined blown converter smelting;
In described LF refinement step, in refining process, abundant stirringization slag, makes yellowish-white slag;
In described full guard continuous casting step, adopt the casting of submerged nozzle full guard;
In described milling step, the soaking temperature of process furnace is 1200 ~ 1215 DEG C, finishing temperature is 880 DEG C in web central authorities, stocking naturally cools to 300-450 DEG C at cold bed, then water-cooled is carried out, rolled piece temperature is down to after below 100 DEG C, sends into straightener and align, finally rolled piece is cut dimensioning;
The 500MPa level fork truck gantry-shaped steel that this production method obtains consists of the following composition by weight percentage: C0.24 ~ 0.30%, Si0.15 ~ 0.30%, Mn1.05 ~ 1.30%, P≤0.025%, S≤0.015%, V0.05 ~ 0.08%, and all the other are iron and inevitable impurity.
The soaking temperature controlling process furnace in milling step of the present invention is 1200-1215 DEG C, VN alloy can well be made fully to dissolve, play the effect of crystal grain thinning, avoid occurring may causing coarse grains because Heating temperature is too high simultaneously, cause intensity not reach the situation of requirement, the soaking before this rolling serves vital effect for the high strength realizing carbon shaped steel in the present invention.
In the above-mentioned methods, as a kind of preferred implementation, described 500MPa level fork truck gantry-shaped steel consists of the following composition by weight percentage: C0.25 ~ 0.29%, Si0.20 ~ 0.30%, Mn1.15 ~ 1.25%, P≤0.025%, S≤0.015%, V0.065 ~ 0.075%, and all the other are iron and inevitable impurity.
In the above-mentioned methods, as a kind of preferred implementation, in converter smelting step, adopt the low rifle bit manipulation of the large quantity of slag, converting process slag charge adds in two batches, adds 2/3 slag charge in the first batch; Adopt silicomanganese, middle manganese, vanadium nitrogen to carry out alloying, the target value of molten steel interalloy element controls by the intermediate value of respective element scope; Adopt aluminium manganese-ferro deoxidation, add-on 1.5 ~ 2.0kg/t steel; Add synthetic slag 8 ~ 10kg/t steel in tapping process, when molten steel go out to 1/4 time evenly add silicomanganese, middle manganese, aluminium ferromanganese, VN alloy successively, molten steel go out to 3/4 time add, alloy is aimed at steel stream and is impacted and go to add.In converter steelmaking process, adopt aluminium manganese-ferro deoxidation, in molten steel, dissolved aluminum reaches 0.03% ~ 0.05wt%, and deoxidizing capacity is much larger than reductors such as silicon, carbon, manganese, and steel water oxygen is almost all transformed into Al
2o
3, add the oxygen level that can effectively reduce on a small quantity in molten steel, reduce oxide inclusion in steel, improve Cleanliness of Molten Steel, improve the over-all properties of product.
In the above-mentioned methods, as a kind of preferred implementation, in described LF refinement step, also comprise the omnidistance argon bottom-blowing of refining process to stir, the refining later stage keeps the little argon gas of top of the slag fine motion to stir more than 10min, the pure calcium core-spun yarn of the real core of feeding before departures, and feed quantity is 120 ~ 150m/ stove; Wherein, the little argon gas of described top of the slag fine motion refers to that argon flow amount is 50 ~ 150NL/min.Adopt in the present invention and feed the pure calcium core-spun yarn of real core, the recovery rate of calcium is high, line feeding length is short, the line feeding time is short, molten steel temperature drop is few, such as compared to iron calcium line, the recovery rate of calcium improves 30%, line feeding length reduces 50%, line feeding time shorten 2 ~ 3min, molten steel temperature drop reduces 3 ~ 5 DEG C, can reach deoxidation, desulfurization, makes nonmetal inclusion sex change and remove the good metallurgical effects such as hazardous trace elements.
In the above-mentioned methods; as a kind of preferred implementation; in described full guard continuous casting step; use stopper tundish; use the cast of submerged nozzle full guard; wherein; two cold employings are weak cold, and crystallizer adopts non-sinusoidal oscillation, and liquidus temperature is 1509 DEG C; tundish superheating temperature is by 20 ~ 30 DEG C of controls; middle bag first furnace temperature controls at 1530 ~ 1535 DEG C, and even water heat and control at 1525 ~ 1533 DEG C, continuous caster is that 6 machines 6 flow; casting blank specification is 165mm × 200mm, and pulling rate is 1.0 ~ 1.3m/min.The stopper control mechanism that tundish of the present invention adopts, effectively can control casting stream, improve continuous casting steel line stability, reduce casting blank defect, and then enhance product performance.
The NM operation of the present invention, is this area routine techniques.
Compared with prior art, the present invention has following beneficial effect: the present invention is mainly for the problem of fork truck gantry-shaped steel in composition, smelting and the operation of rolling, a kind of production method of 500MPa level fork truck gantry-shaped steel is provided, the method is by improving carbon content, reduce sulphur, phosphorus content, microalloying mainly adopts vanadium, does not add other element, does not control cold and do not need to heat-treat after rolling.P, S content of the present invention is low, microalloy only adopts V, under ensureing that product has the prerequisite of excellent mechanical performances, achieves low cost production.Steel mechanical property of the present invention is good, and yield strength average out to 531MPa, tensile strength average out to 685MPa, unit elongation average out to 23.5%, Brinell hardness is greater than 210,20 DEG C of average 59J of ballistic work.
Embodiment
Below by specific embodiment, the present invention is described in detail, but the present invention is not limited to this.
The production method of embodiment of the present invention 1-3 comprises molten iron pre-desulfurization, converter smelting (following examples adopt 80 tons of top and bottom combined blown converter smeltings), LF refining, full guard continuous casting, rolling (following examples adopt the rolling of 1-3 milling train layout pattern production line) successively, may be summarized to be:
1) molten iron is to desulfurization station, ensures that the sulphur content in molten iron is≤0.010wt% after desulfurization.
2) converter smelting: by the low rifle bit manipulation of the large quantity of slag, converting process, slag charge (adds 2/3 slag charge in the first batch) in two batches and adds, omnidistance bitsization are good, change is saturating.Adopt silicomanganese, middle manganese, vanadium nitrogen carries out alloying, requirement alloy is clean, dry, the target value of molten steel interalloy element controls by the intermediate value of respective element scope, adopt aluminium manganese-ferro deoxidation, add-on 1.5 ~ 2.0kg/t steel, synthetic slag 8 ~ 10kg/t steel is added in tapping process, when molten steel go out to 1/4 time successively, evenly add silicomanganese, middle manganese, aluminium ferromanganese, VN alloy, molten steel go out to 3/4 time add, alloy is aimed at steel stream impact zone and is added, those skilled in the art can select suitable compound or composition as synthetic slag according to actual needs, as long as component content meets the requirements.
3) LF refining: abundant stirringization slag in refining process, make yellowish-white slag, omnidistance argon bottom-blowing stirs, early stage according to circumstances suitably can heighten argon pressure, the refining later stage keeps the little argon gas of top of the slag fine motion to stir more than 10min, the pure calcium core-spun yarn of the feeding real core of feeding before departures, the pure calcium core-spun yarn feed quantity of real core is 120 ~ 150m/ stove.Wherein, the little argon gas amount of described top of the slag fine motion refers to that argon flow amount is 50 ~ 150NL/min.
4) continuous casting: use stopper tundish; use the cast of submerged nozzle full guard, wherein, two cold employings are weak cold; crystallizer adopts non-sinusoidal oscillation; liquidus temperature is 1509 DEG C, and tundish superheating temperature is by 20 ~ 30 DEG C of controls, and middle bag first furnace temperature controls at 1530 ~ 1535 DEG C; even watering heat controls at 1525 ~ 1533 DEG C; continuous caster is that 6 machines 6 flow, and casting blank specification is 165mm × 200mm, and pulling rate is 1.0 ~ 1.3m/min.
5) soaking temperature of process furnace is 1200 ~ 1210 DEG C, and finishing temperature is 880 DEG C in web central authorities, and stocking naturally cools to less than 450 DEG C at cold bed, carry out water-cooled, rolled piece temperature is down to after below 100 DEG C, sends into straightener and align, finally rolled piece is cut dimensioning.The 500MPa level fork truck gantry-shaped steel obtained by aforesaid method is consisted of the following composition by weight percentage: C0.25 ~ 0.29%, Si0.20 ~ 0.30%, Mn1.20 ~ 1.25%, P≤0.025%, S≤0.015%, V0.065 ~ 0.075%, and all the other are iron and inevitable impurity.
6) specific chemical composition of steel that obtains of three embodiments is see table 1, and converter steelmaking process recorder is in table 2, and refining process recorder is in table 3, and casting process recorder is in table 4, and operation of rolling recorder is in table 5, and stocking mechanical property recorder is in table 6.
Table 1: main chemical compositions weight percent (wt%) in steel
| Embodiment | C | Si | Mn | P | S | V |
| 1 | 0.26 | 0.28 | 1.24 | 0.016 | 0.006 | 0.07 |
| 2 | 0.29 | 0.29 | 1.25 | 0.019 | 0.003 | 0.072 |
| 3 | 0.27 | 0.29 | 1.24 | 0.019 | 0.008 | 0.074 |
Table 2: converter steelmaking process recorder
Table 3: refining process recorder
| Embodiment | Ca line feed quantity (m/ stove) | Little argon gas churning time (min) | Argon flow amount (NL/min) |
| 1 | 127 | 11 | 80 |
| 2 | 136 | 13 | 80 |
| 3 | 130 | 10 | 80 |
Table 4: casting process recorder
Table 5: operation of rolling recorder
Table 6: stocking mechanical property recorder
The thinking of carbon+vanadium micro-alloying+low S, P+ aluminium deoxidation+stopper tundish during embodiment of the present invention process design adopts, middle carbon is applied seldom in shaped steel field, effectively can improve product strength, hardness and the mechanical property such as wear-resisting; Vanadium micro-alloying is by grain refining and separate out intensity and the toughness that precipitation waits effect enhanced products; Low S, P control to avoid steel to occur normal temperature and low temperature brittleness rising, improve steel toughness and security and stability thereof; Aluminium deoxidation effectively can reduce oxygen content in steel, reduces steel inclusion, improves Cleanliness of Molten Steel, improves product over-all properties.Stopper tundish can improve continuous casting steel line stability, reduces casting blank defect, and then enhances product performance.In addition, the soaking temperature controlling process furnace in milling step is 1200-1215 DEG C, VN alloy can well be made fully to dissolve, play the effect of crystal grain thinning, avoid occurring may causing coarse grains because Heating temperature is too high simultaneously, cause intensity not reach the situation of requirement.
Produce with current gantry-shaped steel of forklift and compare, technical solution of the present invention also has following features:
1) product does not add Nb alloy, can reduce strand crack sensitivity, significantly improve cc billet surface quality, can realize the continuous and stable production of 500MPa level fork truck gantry-shaped steel;
2) only add V alloy, do not control cold after rolling and do not need to heat-treat, complete Composition Design and the production of 500MPa level fork truck gantry-shaped steel, reduce the cost of alloy of production process.
3) the product good mechanical properties of production method manufacture of the present invention, yield strength average out to 531MPa is the fork truck gantry-shaped steel that current domestic intensity is the highest.
Finally it should be noted that: above embodiment is the unrestricted technical scheme of the present invention in order to explanation only, although with reference to above-described embodiment to invention has been detailed description, will be understood by those skilled in the art that, still can modify to the present invention or equivalent replacement, and not departing from any modification or partial replacement of the spirit and scope of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (4)
1. a production method for 500MPa level fork truck gantry-shaped steel, is characterized in that, comprises molten iron pre-desulfurization, converter smelting, LF refining, full guard continuous casting, milling step successively, wherein:
In described molten iron pre-desulfurization step, after desulfurization, ensure that Sulfur Content in Hot Iron content is≤0.010wt%;
In described converter smelting step, adopt top and bottom combined blown converter smelting;
In described LF refinement step, in refining process, abundant stirringization slag, makes yellowish-white slag;
In described full guard continuous casting step, adopt the casting of submerged nozzle full guard;
In described milling step, the soaking temperature of process furnace is 1200 ~ 1215 DEG C, finishing temperature is 880 DEG C in web central authorities, stocking naturally cools to 300-450 DEG C at cold bed, then water-cooled is carried out, rolled piece temperature is down to after below 100 DEG C, sends into straightener and align, finally rolled piece is cut dimensioning;
The 500MPa level fork truck gantry-shaped steel that this production method obtains consists of the following composition by weight percentage: C0.25 ~ 0.29%, Si0.20 ~ 0.29%, Mn1.15 ~ 1.25%, P≤0.025%, S≤0.015%, V0.065 ~ 0.075%, and all the other are iron and inevitable impurity.
2. production method according to claim 1, is characterized in that, in converter smelting step, adopt the low rifle bit manipulation of the large quantity of slag, converting process slag charge adds in two batches, adds 2/3 slag charge in the first batch; Adopt silicomanganese, middle manganese, vanadium nitrogen to carry out alloying, the target value of molten steel interalloy element controls by the intermediate value of respective element scope; Adopt aluminium manganese-ferro deoxidation, add-on 1.5 ~ 2.0kg/t steel; Add synthetic slag 8 ~ 10kg/t steel in tapping process, when molten steel go out to 1/4 time evenly add silicomanganese, middle manganese, aluminium ferromanganese, VN alloy successively, molten steel go out to 3/4 time add, alloy aim at steel stream impact zone add.
3. production method according to claim 1, it is characterized in that, in described LF refinement step, in described LF refinement step, also comprise the omnidistance argon bottom-blowing of refining process to stir, the refining later stage keeps the little argon gas of top of the slag fine motion to stir more than 10min, the pure calcium core-spun yarn of the real core of feeding before departures, and feed quantity is 120 ~ 150m/ stove; Wherein, the little argon gas of described top of the slag fine motion refers to that argon flow amount is 50 ~ 150NL/min.
4. production method according to claim 1; it is characterized in that; in described full guard continuous casting step; use stopper tundish; use the cast of submerged nozzle full guard; wherein; two cold employings are weak cold, and crystallizer adopts non-sinusoidal oscillation, and liquidus temperature is 1509 DEG C; tundish superheating temperature is by 20 ~ 30 DEG C of controls; middle bag first furnace temperature controls at 1530 ~ 1535 DEG C, and even water heat and control at 1525 ~ 1533 DEG C, continuous caster is that 6 machines 6 flow; casting blank specification is 165mm × 200mm, and pulling rate is 1.0 ~ 1.3m/min.
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| CN103074545A (en) * | 2013-02-05 | 2013-05-01 | 莱芜钢铁集团有限公司 | High-strength low temperature hot rolling resistant channel steel for forklift gantry and preparation method for channel steel |
| CN103266273A (en) * | 2013-06-09 | 2013-08-28 | 安徽霍山科皖特种铸造有限责任公司 | Alloy material and method for manufacturing forklift beam by use of same |
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| CN103074545A (en) * | 2013-02-05 | 2013-05-01 | 莱芜钢铁集团有限公司 | High-strength low temperature hot rolling resistant channel steel for forklift gantry and preparation method for channel steel |
| CN103266273A (en) * | 2013-06-09 | 2013-08-28 | 安徽霍山科皖特种铸造有限责任公司 | Alloy material and method for manufacturing forklift beam by use of same |
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