CN103589951B - The production method of big cross section H profile steel - Google Patents

The production method of big cross section H profile steel Download PDF

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CN103589951B
CN103589951B CN201310533057.3A CN201310533057A CN103589951B CN 103589951 B CN103589951 B CN 103589951B CN 201310533057 A CN201310533057 A CN 201310533057A CN 103589951 B CN103589951 B CN 103589951B
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CN103589951A (en
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冯岩青
姜德刚
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Baotou Iron and Steel Group Co Ltd
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Baotou Iron and Steel Group Co Ltd
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Abstract

The present invention discloses the production method of a kind of big cross section H profile steel, comprising: converter smelting, LF refining, casting for shaped blank continuous, casting billet surface cleaning, rolling H shaped steel and aligning. Invention, by appropriate design composition, only adds micro alloying element V, it is to increase the over-all properties of big cross section H profile steel, and production technique is simple, is beneficial to popularization.

Description

The production method of big cross section H profile steel
Technical field
The present invention relates to metallurgical technology field, specifically, it relates to the production method of a kind of big cross section H profile steel
Background technology
Current H profile steel production capacity is basic with domestic needs balance, develops big cross section low-alloy high-strength structure H profile steel and can meet user's particular requirement new steel grade. The product high efficiency of these steel grades and market potential are big, and common steel mill cannot produce. These products reflection enterprise technology strength, the market holding Hi-grade steel H profile steel, can increase share of market.
Hot rolled H-shaped have efficient energy-saving, cross-sectional shape economical rationality, and during rolling, on cross section, each point extends evenly and the advantage such as internal stress is little, extensively builds for Highrise buildings, factory building and the field such as communications and transportation. In recent years consumption situation statistics shows, H profile steel consumption for building is by the trend continuing to rise. At present, in engineering, a large amount of H profile steel used is respectively general carbon steel and the C-Mn low alloy steel of Q235B or Q345B based on intensity rank. Along with high stratification and the large span of building, the demand of high strength H profile steel is by increasing. Therefore the H profile steel of the big cross section size that development of new has high strength has important practical significance and economic worth.
The section size of big cross section H profile steel generally refers to the H profile steel of HW300mm �� 300mm��HW1000mm �� 300mm. There is difference in the H profile steel of its production technique and composition design and little specification, for ensureing the low-temperature impact toughness of high powerful H profile steel, composition need to add when designing and ensure low-temperature impact toughness while alloying element is gained in strength, and during hot rolling, rolling load is obviously greater than little specification H profile steel.
Current domestic big cross section H profile steel adopts special-shaped base to produce, and special-shaped billet casting base quality produces the most outstanding problem of big cross section H profile steel.
Summary of the invention
Technical problem to be solved by this invention is to provide the production method of a kind of big cross section H profile steel, it is possible to produce the big cross section H profile steel with excellent over-all properties.
The technical scheme of the present invention is as follows:
The production method of a kind of big cross section H profile steel, comprise: converter smelting, LF refining, casting for shaped blank continuous, casting billet surface cleaning, rolling H shaped steel and aligning, the mass percentage of the chemical composition producing the material of the described big cross section H profile steel obtained comprises: C0.16��0.20%, Si0.25��0.40%, Mn1.35��1.50%, P��0.03%, S��0.020%, N��0.012%, V0.10��0.20%, 0.015%��Al��0.030%, all the other are Fe and impurity.
Further: described converter smelting adopts silicomanganese and ferromanganese deoxidation alloying, has aluminium final deoxygenation; Mass percentage >=0.03% of the terminal point control C of described converter smelting, mass percentage��0.05% of the mass percentage < 0.025%, S of P, the tapping temperature > of described converter smelting 1640 DEG C.
Further: described LF refining comprises heating and soft blow, the total time of described LF refining is 33-63 minute, described heat-up time is 23-28 minute, the temperature in place of described LF refining is 1490 DEG C-1550 DEG C, the temperature of offing normal of described LF refining is 1583 DEG C-1621 DEG C, the soft blow time > 10min of described LF refining, described soft blow adopts the switching of nitrogen argon, and the flow of described soft blow is 100Ni/min.
Further: the liquidus temperature of described casting for shaped blank continuous is 1511 DEG C-1516, molten steel overheat �� T��30 DEG C, draw speed to be 0.7��1.1m/min.
Further: the Heating temperature of the process furnace of described rolling H shaped steel is 1250 DEG C��1280 DEG C, it is weak reducing atmosphere in process furnace, start rolling temperature is 1180 DEG C��1220 DEG C, compact type (CompactCartridgeStands, CCS) frame of universal mill carries out 8 passage rollings, universal mill roll speed >=4m/s, before the machine of compact type universal mill finish to gauge, temperature is 880 DEG C��950 DEG C.
Further: the mass percentage of the chemical composition producing the material of the described big cross section H profile steel obtained comprises: C0.17%, Si0.29%, Mn1.42%, P0.03%, S0.014%, N0.004%, V0.11%, Al0.025%; Or, C0.18%, Si0.37%, Mn1.41%, P0.029%, S0.02%, N0.004%, V0.12%, Al0.025%; Or, C0.17%, Si0.30%, Mn1.40%, P0.025%, S0.014%, N0.0070%, V0.12%, Al0.02%; Or, C0.16%, Si0.40%, Mn1.35%, P0.021%, S0.017%, N0.008%, V0.2%, Al0.030%; Or, C0.20%, Si0.25%, Mn1.50%, P0.027%, S0.011%, N0.008%, V0.2%, Al0.03%.
The technique effect of the present invention is as follows:
1, the present invention is by appropriate design composition, only adds micro alloying element V, it is to increase the over-all properties of big cross section H profile steel, and production technique is simple, be beneficial to popularization.
2, the micro alloying element V of the present invention plays solution strengthening in big cross section H profile steel, ensure that the impelling strength of steel.
3, the present invention makes the mechanical property of big cross section H profile steel meet user's service requirements completely by optimization production method, can produce with method the easiest, efficient and manufacture big cross section H profile steel again, reduce production cost.
4, the big cross section H profile steel alloy content that the present invention produces is lower, and finishing temperature height, reduce load and the energy consumption of milling train, it is to increase production efficiency.
Accompanying drawing explanation
Fig. 1 is the schema of the production method of the big cross section H profile steel of the present invention;
Fig. 2 is the organization chart of the big cross section H profile steel under the differing temps of embodiments of the invention 1, and wherein (a) is the organization chart at 20 DEG C, and (b) is the organization chart at 0 DEG C, (c) be-20 DEG C at organization chart.
Embodiment
As shown in Figure 1, being the schema of production method of the big cross section H profile steel of the present invention, its concrete steps are as follows:
Step S1: converter smelting
Material condition requires molten iron pre-desulfurization, mass percentage��0.120% of P. Adopting silicomanganese and ferromanganese deoxidation alloying, its add-on is determined according to the composition of concrete finished product, has aluminium final deoxygenation. Mass percentage >=0.03% of the terminal point control C of converter smelting, mass percentage��0.05% of the mass percentage < 0.025%, S of P. The tapping temperature > of converter smelting 1640 DEG C.
Step S2:LF refining
LF refining time is 33-63 minute. LF refining comprise heating and soft blow, wherein, heat-up time 23-28min, soft blow time >=10min. The temperature in place of LF refining is 1490 DEG C-1550 DEG C, and the temperature of offing normal of LF refining is 1583 DEG C-1621 DEG C, and soft blow adopts the switching of nitrogen argon, and soft blow flow is 100Ni/min.
LF refining adopts makes white slag operation. The latter stage of LF refining adds vanadium iron.
Step S3: casting for shaped blank continuous
Special-shaped billet crystallizer is adopted to carry out drawing base. The liquidus temperature of casting for shaped blank continuous is 1511 DEG C-1516 DEG C, molten steel overheat �� T��30 DEG C. Casting for shaped blank continuous adopts perseverance to draw speed operation, draws speed to be 0.7��1.1m/min. Strand after casting for shaped blank continuous adopts stacking slow cooling.
Step S4: casting billet surface is cleared up
The strand cutting 100mm-300mm thickness carries out low-power sulphur print inspection, ensures that strand is without being rolled H profile steel after surface quality and internal soundness again. Before strand enters the process furnace of rolling H shaped steel, again carry out visual inspection, choose have scab, crackle or stick up the steel billet of skin.
Step S5: rolling H shaped steel
The Heating temperature of the process furnace of rolling H shaped steel is 1250 DEG C��1280 DEG C. It is weak reducing atmosphere in process furnace. Strand to be carried out dephosphorize by high pressure water before entering BD1 roughing mill. Start rolling temperature is 1180 DEG C��1220 DEG C, and the frame of compact type universal mill carries out 8 passage rollings, the roll speed >=4m/s of universal mill, and before the machine of compact type universal mill finish to gauge, temperature is 880 DEG C��950 DEG C.
Step S6: aligning
Straightening process adopts cold straightening.
Through above-mentioned steps, the chemical composition mass percentage of the big cross section H profile steel material that the present invention obtains comprises: C0.16��0.20%, Si0.25��0.40%, Mn1.35��1.50%, P��0.03%, S��0.020%, N��0.012%, V0.10��0.20%, 0.015%��Al��0.030%, and all the other are Fe and impurity. The mass percentage of the chemical composition of the material of this big cross section H profile steel is preferably C0.17%, Si0.30%, Mn1.40%, P0.025%, S0.014%, N0.0070%, V0.12%, Al0.02%, and all the other are Fe and impurity.
Below in conjunction with specific embodiment, the invention will be further described.
Embodiment 1
The production method of this embodiment comprises 150t converter smelting, LF refining, casting for shaped blank continuous, casting billet surface cleaning, rolling H shaped steel and aligning successively.
150t converter smelting adopts silicomanganese and ferromanganese deoxidation alloying, has aluminium final deoxygenation. The mass percentage of the terminal C of 150t converter smelting is the mass percentage of 0.06%, P be the mass percentage of 0.02%, S is 0.04%. The tapping temperature of control converter smelting is 1650 DEG C.
Adopting during LF refining and make white slag operation, the latter stage of LF refining adds vanadium iron. Every 100 tons of LF refined molten steel join slag material and alloy addition comprises: lime 401 kilograms, 201 kilograms, alumina, 80 kilograms, calcium carbide, 60 kilograms, hard coal, 451 kilograms, ferromanganese, ferrosilicon 201 kilograms, vanadium iron 130 kilograms. The temperature in place of LF refining is 1554 DEG C, and the temperature of offing normal of LF refining is 1597 DEG C, and the heat-up time of LF refining is the time of 27min, LF refining is 63 minutes. Wherein the mass percentage of LF molten steel composition in place is C0.11%, Si0.19%, Mn1.04%, P0.03% and S0.03%; The off normal mass percentage of molten steel composition of LF is C0.19%, Si0.30%, Mn1.4%, P0.03%, S0.01%, Al0.01% and V0.11%. Refining terminate after every 100 tons of LF refined molten steel feed silicon-calcium wire 100 meters, make inclusion modification, the soft blow time be 10 minutes to ensure inclusion floating, soft blow adopt nitrogen argon switching, soft blow flow is 100Ni/min.
Special-shaped billet crystallizer is adopted to carry out drawing base. The liquidus temperature of casting for shaped blank continuous is 1511 DEG C-1516 DEG C. The teeming temperature of casting for shaped blank continuous is 1575 DEG C, and even casting superheating temperature is controlled to 15��30 DEG C, draws speed for 1.0m/min. Steel billet stacking slow cooling after casting.
The strand cutting 100mm-300mm thickness carries out low-power sulphur print inspection, and from the low power tissue of continuously cast bloom and sufur printing result, special-shaped base is organized relatively even, and whole section inclusion distribution is more even. Steelworks ensures that steel billet is sent to Steel Mill without after surface quality and internal soundness. Steel Mill again carries out visual inspection before strand enters process furnace, have scab, crackle, the steel billet that sticks up skin choose.
The Heating temperature of the process furnace of rolling H shaped steel is 1250 DEG C. It is weak reducing atmosphere in process furnace. Steel billet enters BD1 roughing mill advance horizontal high voltage water dephosphorization, and the start rolling temperature of rolling is 1200 DEG C, and the frame of CCS universal mill carries out 8 passage rollings, and before the machine of roll speed >=4m/s, CCS finish to gauge, temperature is 930 DEG C.
H profile steel aligning after rolling is obtained finished product.
The mass percentage of the chemical composition of the big cross section H profile steel that aforesaid method obtains is: C0.17%, Si0.29%, Mn1.42%, P0.03%, S0.014%, N0.004%, V0.11%, Al0.025%, and all the other are Fe and inevitable impurity.
The mechanical property of the product that this production method obtains is in table 1. As shown in Figure 2, it is the organization chart of the big cross section H profile steel under the differing temps of embodiments of the invention 1. Can finding out that the H profile steel of hot rolling state is organized as perlite+ferrite from metallographic structure, reduce with the reduction impact value of temperature, the ductile-brittle transition temperature of this steel is-20 DEG C.
Embodiment 2
The production method of this embodiment comprises 150t converter smelting, LF refining, casting for shaped blank continuous, casting billet surface cleaning, rolling H shaped steel and aligning successively.
150t converter smelting adopts silicomanganese and ferromanganese deoxidation alloying, has aluminium final deoxygenation. The mass percentage of the C of the converter terminal of 150t converter smelting is the mass percentage of 0.09%, P be the mass percentage of 0.020%, S is 0.04%. The tapping temperature of control converter smelting is 1650 DEG C.
Adopting during LF refining and make white slag operation, the latter stage of LF refining adds vanadium iron. Every 100 tons of LF refined molten steel join slag material and alloy addition comprises: lime 401 kilograms, 203 kilograms, alumina, 80 kilograms, calcium carbide, 20 kilograms, hard coal, 371 kilograms, ferromanganese, ferrosilicon 201 kilograms, vanadium iron 70 kilograms. The temperature in place of LF refining is 1524 DEG C, and the temperature of offing normal of LF refining is 1583 DEG C, and heat-up time is 27min, LF refining time is 36 minutes. Wherein the mass percentage of LF molten steel composition in place is C0.14%, Si0.16%, Mn1.08%, P0.03%, S0.03%; The off normal mass percentage of molten steel composition of LF is C0.17%, Si0.35%, Mn1.39%, P0.03%, S0.02%, Al0.01%, V0.12%. LF refining terminate after every 100 tons of LF refined molten steel feed silicon-calcium wire 100 meters makes inclusion modification, the soft blow time be 10 minutes to ensure inclusion floating, soft blow adopt nitrogen argon switching, soft blow flow is 100Ni/min.
Special-shaped billet crystallizer is adopted to carry out drawing base. The liquidus temperature of casting for shaped blank continuous is 1511 DEG C-1516 DEG C. Teeming temperature during casting for shaped blank continuous is 1575 DEG C, and even casting superheating temperature controls at 15��30 DEG C, draws speed for 0.7m/min. Casting blank stacking slow cooling after casting for shaped blank continuous.
The strand cutting 100mm-300mm thickness carries out low-power sulphur print inspection. Steelworks ensures that steel billet is sent to Steel Mill without after surface quality and internal soundness. Steel Mill again carries out visual inspection before strand enters process furnace, have scab, crackle, the steel billet that sticks up skin choose.
The Heating temperature of the process furnace of rolling H shaped steel is 1250 DEG C. Being weak reducing atmosphere in process furnace, steel billet enters BD1 roughing mill advance horizontal high voltage water dephosphorization, and rolling start rolling temperature is 1200 DEG C, and the frame of CCS universal mill carries out 8 passage rollings, and before the machine of universal mill roll speed >=4m/s, CCS finish to gauge, temperature is 930 DEG C.
H profile steel aligning after rolling is obtained finished product.
The mass percentage of the chemical composition of the big cross section H profile steel that aforesaid method obtains is: C0.18%, Si0.37%, Mn1.41%, P0.029%, S0.02%, N0.004%, V0.12%, Al0.025%, and all the other are Fe and inevitable impurity.
The mechanical property of the product that this production method obtains is in table 1.
Embodiment 3
The production method of this embodiment comprises 150t converter smelting, LF refining, casting for shaped blank continuous, casting billet surface cleaning, rolling H shaped steel and aligning successively.
150t converter smelting adopts silicomanganese and ferromanganese deoxidation alloying, has aluminium final deoxygenation. The mass percentage of the C of the converter terminal of 150t converter smelting is the mass percentage of 0.05%, P be the mass percentage of 0.01%, S is 0.03%. The tapping temperature of control converter smelting is 1650 DEG C.
Adopting during LF refining and make white slag operation, the latter stage of LF refining adds vanadium iron. Every 100 tons of LF refined molten steel join slag material and alloy addition comprises: lime 401 kilograms, 201 kilograms, alumina, 80 kilograms, calcium carbide, 55 kilograms, hard coal, 463 kilograms, ferromanganese, ferrosilicon 201 kilograms, vanadium iron 125 kilograms. The temperature in place of LF refining is 1550 DEG C, and the temperature of offing normal of LF refining is 1621 DEG C, and heat-up time is 25min, LF refining time is 49 minutes. Wherein the mass percentage of LF molten steel composition in place is C0.11%, Si0.18%, Mn1.04%, P0.03%, S0.03%; The off normal mass percentage of molten steel composition of LF is C0.19%, Si0.31%, Mn1.39%, P0.03%, S0.01%, Al0.01%, V0.12%. After LF refining terminates, every 100 tons of LF refined molten steel hello silicon-calcium wire 100 meters makes inclusion modification, and the soft blow time, soft blow adopted the switching of nitrogen argon, and soft blow flow is 100Ni/min more than 10 minutes to ensure inclusion floating.
Special-shaped billet crystallizer is adopted to carry out drawing base. The liquidus temperature of casting for shaped blank continuous is 1511 DEG C-1516 DEG C. Teeming temperature during casting for shaped blank continuous is 1575 DEG C, and even casting superheating temperature controls at 15��30 DEG C, draws speed for 0.9m/min. Casting blank stacking slow cooling after casting for shaped blank continuous.
The strand cutting 100mm-300mm thickness carries out low-power sulphur print inspection. Steelworks ensures that steel billet is sent to Steel Mill without after surface quality and internal soundness. Steel Mill again carries out visual inspection before strand enters process furnace, have scab, crackle, the steel billet that sticks up skin choose.
The Heating temperature of the process furnace of rolling H shaped steel is 1265 DEG C. Being weak reducing atmosphere in process furnace, steel billet enters BD1 roughing mill advance horizontal high voltage water dephosphorization, and rolling start rolling temperature is 1195 DEG C, and the frame of CCS universal mill carries out 8 passage rollings, and before the machine of universal mill roll speed >=4m/s, CCS finish to gauge, temperature is 920 DEG C.
H profile steel aligning after rolling is obtained finished product.
The mass percentage of the chemical composition of the big cross section H profile steel that aforesaid method obtains is: C0.17%, Si0.30%, Mn1.40%, P0.025%, S0.014%, N0.0070%, V0.12%, Al0.02%, and all the other are Fe and inevitable impurity.
The mechanical property of the product that this production method obtains is in table 1.
Embodiment 4
The production method of this embodiment comprises 150t converter smelting, LF refining, casting for shaped blank continuous, casting billet surface cleaning, rolling H shaped steel and aligning successively.
150t converter smelting adopts silicomanganese and ferromanganese deoxidation alloying, has aluminium final deoxygenation. The mass percentage of the C of the converter terminal of 150t converter smelting is the mass percentage of 0.03%, P be the mass percentage of 0.018%, S is 0.05%. The tapping temperature of control converter smelting is 1641 DEG C.
Adopting during LF refining and make white slag operation, the latter stage of LF refining adds vanadium iron. Every 100 tons of LF refined molten steel join slag material and alloy addition comprises: lime 400 kilograms, 202 kilograms, alumina, 80 kilograms, calcium carbide, 30 kilograms, hard coal, 360 kilograms, ferromanganese, ferrosilicon 201 kilograms, vanadium iron 89 kilograms. The temperature in place of LF refining is 1511 DEG C, and the temperature of offing normal of LF refining is 1604 DEG C, and heat-up time is 23min, LF refining time is 33 minutes. Wherein the mass percentage of LF molten steel composition in place is C0.10%, Si0.20%, Mn1.02%, P0.03%, S0.03%; The off normal mass percentage of molten steel composition of LF is C0.15%, Si0.38%, Mn1.35%, P0.03%, S0.02%, Al0.01%, V0.14%. LF refining terminate after every 100 tons of LF refined molten steel feed silicon-calcium wire 100 meters makes inclusion modification, the soft blow time be 10 minutes to ensure inclusion floating, soft blow adopt nitrogen argon switching, soft blow flow is 100Ni/min.
Special-shaped billet crystallizer is adopted to carry out drawing base. The liquidus temperature of casting for shaped blank continuous is 1511 DEG C-1516 DEG C. Teeming temperature during casting for shaped blank continuous is 1575 DEG C, and even casting superheating temperature controls at 15��30 DEG C, draws speed for 1.1m/min. Casting blank stacking slow cooling after casting for shaped blank continuous.
The strand cutting 100mm-300mm thickness carries out low-power sulphur print inspection. Steelworks ensures that steel billet is sent to Steel Mill without after surface quality and internal soundness. Steel Mill again carries out visual inspection before strand enters process furnace, have scab, crackle, the steel billet that sticks up skin choose.
The Heating temperature of the process furnace of rolling H shaped steel is 1280 DEG C. Being weak reducing atmosphere in process furnace, steel billet enters BD1 roughing mill advance horizontal high voltage water dephosphorization, and rolling start rolling temperature is 1220 DEG C, and the frame of CCS universal mill carries out 8 passage rollings, and before the machine of universal mill roll speed >=4m/s, CCS finish to gauge, temperature is 950 DEG C.
H profile steel aligning after rolling is obtained finished product.
The mass percentage of the chemical composition of the big cross section H profile steel that aforesaid method obtains is: C0.16%, Si0.40%, Mn1.35%, P0.021%, S0.017%, N0.008%, V0.2%, Al0.030%, and all the other are Fe and inevitable impurity.
The mechanical property of the product that this production method obtains is in table 1.
Embodiment 5
The production method of this embodiment comprises 150t converter smelting, LF refining, casting for shaped blank continuous, casting billet surface cleaning, rolling H shaped steel and aligning successively.
150t converter smelting adopts silicomanganese and ferromanganese deoxidation alloying, has aluminium final deoxygenation. The mass percentage of the C of the converter terminal of 150t converter smelting is the mass percentage of 0.10%, P be the mass percentage of 0.025%, S is 0.03%. The tapping temperature of control converter smelting is 1660 DEG C.
Adopting during LF refining and make white slag operation, the latter stage of LF refining adds vanadium iron. Every 100 tons of LF refined molten steel join slag material and alloy addition comprises: lime 403 kilograms, 201 kilograms, alumina, 80 kilograms, calcium carbide, 57 kilograms, hard coal, 470 kilograms, ferromanganese, ferrosilicon 201 kilograms, vanadium iron 135 kilograms. The temperature in place of LF refining is 1490 DEG C, and the temperature of offing normal of LF refining is 1589 DEG C, and heat-up time is 28min, LF refining time is 57 minutes. Wherein the mass percentage of LF molten steel composition in place is C0.15%, Si0.15%, Mn1.10%, P0.03%, S0.03%; The off normal mass percentage of molten steel composition of LF is C0.21%, Si0.30%, Mn1.42%, P0.03%, S0.01%, Al0.01%, V0.13%. After LF refining terminates, every 100 tons of LF refined molten steel hello silicon-calcium wire 100 meters makes inclusion modification, and the soft blow time, soft blow adopted the switching of nitrogen argon, and soft blow flow is 100Ni/min more than 10 minutes to ensure inclusion floating.
Special-shaped billet crystallizer is adopted to carry out drawing base. The liquidus temperature of casting for shaped blank continuous is 1511 DEG C-1516 DEG C. Teeming temperature during casting for shaped blank continuous is 1575 DEG C, and even casting superheating temperature controls at 15��30 DEG C, draws speed for 0.7m/min. Casting blank stacking slow cooling after casting for shaped blank continuous.
The strand cutting 100mm-300mm thickness carries out low-power sulphur print inspection. Steelworks ensures that steel billet is sent to Steel Mill without after surface quality and internal soundness. Steel Mill again carries out visual inspection before strand enters process furnace, have scab, crackle, the steel billet that sticks up skin choose.
The Heating temperature of the process furnace of rolling H shaped steel is 1270 DEG C. Being weak reducing atmosphere in process furnace, steel billet enters BD1 roughing mill advance horizontal high voltage water dephosphorization, and rolling start rolling temperature is 1180 DEG C, and the frame of CCS universal mill carries out 8 passage rollings, and before the machine of universal mill roll speed >=4m/s, CCS finish to gauge, temperature is 880 DEG C.
H profile steel aligning after rolling is obtained finished product.
The mass percentage of the chemical composition of the big cross section H profile steel that aforesaid method obtains is: C0.20%, Si0.25%, Mn1.50%, P0.027%, S0.011%, N0.008%, V0.2%, Al0.03%, and all the other are Fe and inevitable impurity.
The mechanical property of the product that this production method obtains is in table 1.
The mechanical property of the product of table 1 embodiment 1
From above-described embodiment it may be seen that the web of the big cross section H profile steel of the present invention and wing plate have excellent mechanical property, tensile strength 610-631MPa, yield strength >=460MPa, unit elongation >=21%, 0 DEG C of impact >=98J.

Claims (2)

1. the production method of a big cross section H profile steel, it is characterised in that, comprising: converter smelting, LF refining, casting for shaped blank continuous, casting billet surface cleaning, rolling H shaped steel and aligning, described converter smelting adopts silicomanganese and ferromanganese deoxidation alloying, has aluminium final deoxygenation; Mass percentage >=0.03% of the terminal point control C of described converter smelting, mass percentage��0.05% of the mass percentage < 0.025%, S of P, the tapping temperature > of described converter smelting 1640 DEG C; Described LF refining comprises heating and soft blow, the total time of described LF refining is 33-63 minute, described heat-up time is 23-28min, the temperature in place of described LF refining is 1490 DEG C-1550 DEG C, the temperature of offing normal of described LF refining is 1583 DEG C-1621 DEG C, the soft blow time > 10min of described LF refining, described soft blow adopts the switching of nitrogen argon, and the flow of described soft blow is 100Ni/min; The liquidus temperature of described casting for shaped blank continuous is 1511 DEG C-1516, molten steel overheat �� T��30 DEG C, draws speed to be 0.7��1.1m/min; The Heating temperature of the process furnace of described rolling H shaped steel is 1250 DEG C��1280 DEG C, it is weak reducing atmosphere in process furnace, start rolling temperature is 1180 DEG C��1220 DEG C, the frame of compact type universal mill carries out 8 passage rollings, universal mill roll speed >=4m/s, before the machine of compact type universal mill finish to gauge, temperature is 880 DEG C��950 DEG C; The mass percentage of the chemical composition producing the material of the described big cross section H profile steel obtained comprises: C0.16��0.20%, Si0.25��0.40%, Mn1.35��1.50%, P��0.03%, S��0.020%, N��0.012%, V0.10��0.20%, 0.015%��Al��0.030%, all the other are Fe and impurity.
2. the production method of big cross section H profile steel as claimed in claim 1, it is characterised in that: the mass percentage of the chemical composition producing the material of the described big cross section H profile steel obtained comprises: C0.17%, Si0.29%, Mn1.42%, P0.03%, S0.014%, N0.004%, V0.11%, Al0.025%; Or, C0.18%, Si0.37%, Mn1.41%, P0.029%, S0.02%, N0.004%, V0.12%, Al0.025%; Or, C0.17%, Si0.30%, Mn1.40%, P0.025%, S0.014%, N0.0070%, V0.12%, Al0.02%; Or, C0.16%, Si0.40%, Mn1.35%, P0.021%, S0.017%, N0.008%, V0.2%, Al0.030%; Or, C0.20%, Si0.25%, Mn1.50%, P0.027%, S0.011%, N0.008%, V0.2%, Al0.03%.
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CN104073717A (en) * 2014-06-19 2014-10-01 马钢(集团)控股有限公司 H-shaped steel as well as application and production method of H-shaped steel
CN104789856A (en) * 2015-04-13 2015-07-22 内蒙古包钢钢联股份有限公司 Low-cost SM490C hot-rolling H section steel and preparation method thereof
CN104789869A (en) * 2015-04-30 2015-07-22 内蒙古包钢钢联股份有限公司 Novel H-shaped steel for no-galvanization electrified railway touching net post and preparation method thereof
CN107299283A (en) * 2017-05-27 2017-10-27 内蒙古包钢钢联股份有限公司 Depth low temperature resistant hot rolled H-shaped and its production technology
CN107829031A (en) * 2017-11-21 2018-03-23 安徽金阳金属结构工程有限公司 A kind of big cross section H profile steel and its production technology
CN107937808A (en) * 2017-11-21 2018-04-20 安徽金阳金属结构工程有限公司 A kind of hot rolled H-shaped and its production technology
CN108393368A (en) * 2018-03-28 2018-08-14 徐州东鑫铸造有限公司 A kind of H profile steel production technology
CN110484822A (en) * 2019-09-23 2019-11-22 包头钢铁(集团)有限责任公司 A kind of high-strength thick hot-rolling H-shaped piling bar and preparation method thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102618782A (en) * 2012-03-30 2012-08-01 莱芜钢铁集团有限公司 Large-specification Z-direction H-steel and preparation method thereof
CN102676919A (en) * 2012-04-17 2012-09-19 马钢(集团)控股有限公司 Method for cooling low-alloy hot-rolled H-shaped steel with yield strength of 550MPa after rolling

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102618782A (en) * 2012-03-30 2012-08-01 莱芜钢铁集团有限公司 Large-specification Z-direction H-steel and preparation method thereof
CN102676919A (en) * 2012-04-17 2012-09-19 马钢(集团)控股有限公司 Method for cooling low-alloy hot-rolled H-shaped steel with yield strength of 550MPa after rolling

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