CN105695860A - Structural steel and production technology thereof - Google Patents
Structural steel and production technology thereof Download PDFInfo
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- CN105695860A CN105695860A CN201610186656.6A CN201610186656A CN105695860A CN 105695860 A CN105695860 A CN 105695860A CN 201610186656 A CN201610186656 A CN 201610186656A CN 105695860 A CN105695860 A CN 105695860A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C2300/00—Process aspects
- C21C2300/08—Particular sequence of the process steps
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Abstract
The invention discloses a structural steel and a production technology thereof and relates to the technical field of metallurgy. The structural steel, based on a percent by mass, comprises 0.18-0.35% of C, 0.15-0.30% of Si, 0.95-1.3% of Mn, 0-0.01% of P, 0.015-0.04% of Als, 0-0.002% of S, 0.15-0.17% of Mo, 0.7-0.8% of Cr, 0.002-0.008% of Ca, 0.015-0.03% of Nb, 0-0.1% of Ni, 0.15-0.25% of Cu and the balance of Fe and unavoidable impurities. Due to the adoption of the technical scheme, the production cost is low, the production efficiency is high, and a produced steel plate has the characteristics of being high in strength, high in tenacity, low in yield ratio, great in ductility, great in welding property, great in hot and cold workabilities and even in thickness and directional mechanical properties.
Description
Technical field
The present invention relates to metallurgical technology field, be specifically related to a kind of structural steel and production technology thereof。
Background technology
Low-alloy structural steel is one of most important structural timber of China, there is high-intensity high-tenacity, good ductility and cold and hot working performance, have been widely used for each engineering field of the national economy such as building industry, ocean platform, pressure vessel, boiler manfacturing, water/nuclear power station, shipbuilding industry, oil pipeline, bridge, heavy-duty machinery manufacture。High speed development and scientific and technological progress along with national economy, the Important Project such as domestic high-rise building and ultra-large type bridge, power station, ocean platform also get more and more, the development of its using steel plate also develops towards special thickness, extra wide, high-performance direction, particularly the demand of super-thick steel plate (more than 100mm) and technology are required also more and more higher, except requiring that there is high obdurability, it is also desirable to have good anti-lamellar tearing performance, welding performance and the mechanical property uniformity along thickness of slab direction。For a long time by China's production technology, the restriction of technical equipment, cause China to produce this type of high strength special heavy plate and typically require a large amount of heavv alloy elements of addition, and easily produce banded structure, uneven microstructure on thickness direction, rolling deformation is uneven and the defect such as component segregation can have a strong impact on the mechanical property of steel, cause conforming product rate not high, quality fluctuation is big, the problem such as welding performance difference and through-thickness mechanical heterogeneity still exists simultaneously, it is difficult to meet the quality technology requirement of China's super-thick steel plate, cause that product competitiveness is low, seriously constrain development and the application of China's super-thick steel plate, part large project super-thick steel plate still needs to rely on external import to meet domestic market demand。
The patent No. is that CN103725966A discloses a kind of 100-150mm structural alloy steel 4140 slab and production method thereof, comprise the chemical composition (unit of following mass percent, wt%): C:0.39～0.42, Si:0.20～0.30, Mn:0.85～0.95, P≤0.010, S≤0.003, Als:0.020～0.040, Cr:0.9-1.0, Mo:0.17-0.23, other is Fe and relict element。By KR molten iron pretreatment, converter smelting, Argon process, LF refine, VD refine, molding, ingot slow cool, steel ingot cleaning, heating, controlled rolling, the hot and cold process of heap, retarded cooling process, in strict control steel, P, S etc. affect the harmful element content of steel plate plasticity and toughness。
Although technique scheme ensure that 4140 steel grade 100-150mm thickness steel plate internal residual stress minimize, internal soundness is qualified, but cost is high, be unfavorable for popularization and the thickness direction mechanical heterogeneity of steel plate, accordingly, it would be desirable to design the structural steel and production technology thereof that can solve the problem that problem above。
Summary of the invention
Problem to be solved by this invention is to provide a kind of structural steel and production technology thereof。
The purpose of the present invention can be achieved through the following technical solutions:
A kind of structural steel, by mass percentage, described structural steel contains C0.18-0.35%, Si0.15-0.30%, Mn0.95-1.3%, P0-0.01%, Als0.015-0.04%, S0-0.002%, Mo0.15-0.17%, Cr0.7-0.8%, Ca0.002-0.008%, Nb0.015-0.03%, Ni0-0.1%, Cu0.15-0.25%, and surplus is ferrum and inevitable impurity。
Preferably, described structural steel contains C0.30%, Si0.20%, Mn0.95%, P0.01%, Als0.02%, S0.001%, Mo0.15%, Cr0.7%, Ca0.005%, Nb0.02%, Ni0.1%, Cu0.20%, and surplus is ferrum and inevitable impurity。
A kind of production technology of structural steel, described production technology specifically includes following steps:
A. desulfurizing iron: supplied materials liquid steel temperature controls at 1250～1300 DEG C, S≤0.008%, desulfurizing agent addition is every 100t molten steel 700KG, desulfurization terminal S≤0.004%；
B. converter smelting: enter stove molten iron S≤0.004%, P≤0.060%, molten iron temperature >=1350 DEG C, Si0.15-0.30% in hot metal composition, Mn0.95-1.3%, P0-0.01%, tapping temperature >=1600 DEG C, the tapping time cannot be less than 4min, tapping is to 1/3, and order adds Al-Mo, Fe-Cr, Ca-Fe-Nb-Ni-Cu, composite medium aluminium or aluminium block etc. and carries out component controlling, adds to tapping 2/3；
C.LF refine: refining time 35～50min, basicity of slag controls 3.3～3.8；
D.RH application of vacuum: control to arrive at a station liquid steel temperature at 1650～1670 DEG C, the time that processes is at 10～20min；
E. continuous casting: adopt total process protective casting technique; in first heat, the bag degree of superheat must not be higher than 45 DEG C; even water the bag degree of superheat in heat and control at 15-30 DEG C; tundish uses low-carbon (LC) coverture; use square billet medium carbon steel covering slag; must on a small quantity, repeatedly add; to keep the top of the slag stable; middle water-coating port is strict centering in a crystallizer; insertion depth >=70mm, middle bag adopts and completely wraps casting, and changing Bao Shizhong bag liquid level must not lower than 400mm; taking the cast of permanent pulling rate according to section and molten steel overheat, liquid fluctuating controls within ± 5mm
F. ingot slow cool: hang in immediately after the steel ingot demoulding in slow cooling and carry out slow cooling, slow cooling temperature 400-500 DEG C, slow cooling time 48-72h；
G. steel ingot cleaning: steel ingot width 1/2 position is cleared up after terminating by ingot slow cool by flame gun, cleaning width control system is at 30-50CM, and cleaning severity control is at 5-10mm；
H. heating: heating-up temperature and heat time heating time are as follows: steel ingot enters warehouse temperature≤700 DEG C, stewing steel temperature 450-500 DEG C, time 4h, is warming up to a 100 DEG C/S of firing rate, is incubated 8h when temperature rises to 900 DEG C, it is warming up to two firing rate 100-120 DEG C/S, when temperature rises to 1000 DEG C, programming rate is not limit, and temperature rises to insulation 13h when 1260-1800 DEG C, then carries out turning over steel, after steel turning is intensification 2h to 1260-1280 DEG C again, then insulation 2h tapping；
I. rapid laminar cooling: it is 3～10 DEG C/s that cooldown rate controls, final cooling temperature presses 550～600 DEG C of controls, and the lower water yield and upper water yield Ratio control are 1.1～1.5；Last air cooling is to room temperature；
J. carrying out normalizing heat treatment: heat treatment temperature is 880～920 DEG C, time inside furnace is [thickness of slab (mm)+30～50] min, and the type of cooling is that mist is cold or section cooling, 2～5 DEG C/s of rate of cooling, and final cooling temperature is 650～750 DEG C。
Preferably, in described step c, refining time is 50min, and basicity of slag is 3.8。
Preferably, in described step a, supplied materials molten iron temperature is 1300 DEG C。
Preferably, slow cooling temperature 500 DEG C in described step f, slow cooling time 72h。
Adopting technical scheme, production cost is low, production efficiency is high, and the steel plate produced has high intensity, high tenacity, low yield strength ratio, good ductility, welding performance and cold and hot working performance, the uniform feature of thickness direction mechanical property。
Detailed description of the invention
For the technological means making the present invention realize, creation characteristic, reach purpose and effect and be easy to understand, below in conjunction with detailed description of the invention, the present invention is expanded on further。
Embodiment 1:
A kind of structural steel, by mass percentage, described structural steel contains C0.35%, Si0.30%, Mn1.3%, P0.01%, Als0.04%, S0.002%, Mo0.17%, Cr0.8%, Ca0.008%, Nb0.03%, Ni0.1%, Cu0.25%, and surplus is ferrum and inevitable impurity。
A kind of production technology of structural steel, described production technology specifically includes following steps:
A. desulfurizing iron: supplied materials liquid steel temperature controls at 1250～1300 DEG C, S≤0.008%, desulfurizing agent addition is every 100t molten steel 700KG, desulfurization terminal S≤0.004%；
B. converter smelting: enter stove molten iron S≤0.004%, P≤0.060%, molten iron temperature >=1350 DEG C, Si0.15-0.30% in hot metal composition, Mn0.95-1.3%, P0-0.01%, tapping temperature >=1600 DEG C, the tapping time cannot be less than 4min, tapping is to 1/3, and order adds Al-Mo, Fe-Cr, Ca-Fe-Nb-Ni-Cu, composite medium aluminium or aluminium block etc. and carries out component controlling, adds to tapping 2/3；
C.LF refine: refining time 50min, basicity of slag controls 3.8；
D.RH application of vacuum: control to arrive at a station liquid steel temperature at 1670 DEG C, the time that processes is at 20min；
E. continuous casting: adopt total process protective casting technique; in first heat, the bag degree of superheat must not be higher than 45 DEG C; even water the bag degree of superheat in heat and control at 15-30 DEG C; tundish uses low-carbon (LC) coverture; use square billet medium carbon steel covering slag; must on a small quantity, repeatedly add; to keep the top of the slag stable; middle water-coating port is strict centering in a crystallizer; insertion depth >=70mm, middle bag adopts and completely wraps casting, and changing Bao Shizhong bag liquid level must not lower than 400mm; taking the cast of permanent pulling rate according to section and molten steel overheat, liquid fluctuating controls within ± 5mm
F. ingot slow cool: hang in immediately after the steel ingot demoulding in slow cooling and carry out slow cooling, slow cooling temperature 500 DEG C, slow cooling time 72h；
G. steel ingot cleaning: steel ingot width 1/2 position is cleared up after terminating by ingot slow cool by flame gun, cleaning width control system is at 30-50CM, and cleaning severity control is at 5-10mm；
H. heating: heating-up temperature and heat time heating time are as follows: steel ingot enters warehouse temperature≤700 DEG C, stewing steel temperature 450-500 DEG C, time 4h, is warming up to a 100 DEG C/S of firing rate, is incubated 8h when temperature rises to 900 DEG C, it is warming up to two firing rate 100-120 DEG C/S, when temperature rises to 1000 DEG C, programming rate is not limit, and temperature rises to insulation 13h when 1260-1800 DEG C, then carries out turning over steel, after steel turning is intensification 2h to 1260-1280 DEG C again, then insulation 2h tapping；
I. rapid laminar cooling: it is 3～10 DEG C/s that cooldown rate controls, final cooling temperature presses 550～600 DEG C of controls, and the lower water yield and upper water yield Ratio control are 1.1～1.5；Last air cooling is to room temperature；
J. carrying out normalizing heat treatment: heat treatment temperature is 880～920 DEG C, time inside furnace is [thickness of slab (mm)+30～50] min, and the type of cooling is that mist is cold or section cooling, 2～5 DEG C/s of rate of cooling, and final cooling temperature is 650～750 DEG C。
Embodiment 2:
A kind of structural steel, by mass percentage, described structural steel contains C0.18%, Si0.15%, Mn0.95%, Als0.015%, Mo0.15%, Cr0.7%, Ca0.002%, Nb0.015%, Cu0.15%, and surplus is ferrum and inevitable impurity。
A kind of production technology of structural steel, described production technology specifically includes following steps:
A. desulfurizing iron: supplied materials liquid steel temperature controls at 1250～1300 DEG C, S≤0.008%, desulfurizing agent addition is every 100t molten steel 700KG, desulfurization terminal S≤0.004%；
B. converter smelting: enter stove molten iron S≤0.004%, P≤0.060%, molten iron temperature >=1350 DEG C, Si0.15-0.30% in hot metal composition, Mn0.95-1.3%, P0-0.01%, tapping temperature >=1600 DEG C, the tapping time cannot be less than 4min, tapping is to 1/3, and order adds Al-Mo, Fe-Cr, Ca-Fe-Nb-Ni-Cu, composite medium aluminium or aluminium block etc. and carries out component controlling, adds to tapping 2/3；
C.LF refine: refining time 35min, basicity of slag controls 3.3；
D.RH application of vacuum: control to arrive at a station liquid steel temperature at 1650 DEG C, the time that processes is at 10min；
E. continuous casting: adopt total process protective casting technique; in first heat, the bag degree of superheat must not be higher than 45 DEG C; even water the bag degree of superheat in heat and control at 15-30 DEG C; tundish uses low-carbon (LC) coverture; use square billet medium carbon steel covering slag; must on a small quantity, repeatedly add; to keep the top of the slag stable; middle water-coating port is strict centering in a crystallizer; insertion depth >=70mm, middle bag adopts and completely wraps casting, and changing Bao Shizhong bag liquid level must not lower than 400mm; taking the cast of permanent pulling rate according to section and molten steel overheat, liquid fluctuating controls within ± 5mm
F. ingot slow cool: hang in immediately after the steel ingot demoulding in slow cooling and carry out slow cooling, slow cooling temperature 400 DEG C, slow cooling time 48h；
G. steel ingot cleaning: steel ingot width 1/2 position is cleared up after terminating by ingot slow cool by flame gun, cleaning width control system is at 30-50CM, and cleaning severity control is at 5-10mm；
H. heating: heating-up temperature and heat time heating time are as follows: steel ingot enters warehouse temperature≤700 DEG C, stewing steel temperature 450-500 DEG C, time 4h, is warming up to a 100 DEG C/S of firing rate, is incubated 8h when temperature rises to 900 DEG C, it is warming up to two firing rate 100-120 DEG C/S, when temperature rises to 1000 DEG C, programming rate is not limit, and temperature rises to insulation 13h when 1260-1800 DEG C, then carries out turning over steel, after steel turning is intensification 2h to 1260-1280 DEG C again, then insulation 2h tapping；
I. rapid laminar cooling: it is 3～10 DEG C/s that cooldown rate controls, final cooling temperature presses 550～600 DEG C of controls, and the lower water yield and upper water yield Ratio control are 1.1～1.5；Last air cooling is to room temperature；
J. carrying out normalizing heat treatment: heat treatment temperature is 880～920 DEG C, time inside furnace is [thickness of slab (mm)+30～50] min, and the type of cooling is that mist is cold or section cooling, 2～5 DEG C/s of rate of cooling, and final cooling temperature is 650～750 DEG C。
Embodiment 3: a kind of structural steel, by mass percentage, described structural steel contains C0.30%, Si0.20%, Mn0.95%, P0.01%, Als0.02%, S0.001%, Mo0.15%, Cr0.7%, Ca0.005%, Nb0.02%, Ni0.1%, Cu0.20%, and surplus is ferrum and inevitable impurity。
A kind of production technology of structural steel, described production technology specifically includes following steps:
A. desulfurizing iron: supplied materials liquid steel temperature controls at 1250～1300 DEG C, S≤0.008%, desulfurizing agent addition is every 100t molten steel 700KG, desulfurization terminal S≤0.004%；
B. converter smelting: enter stove molten iron S≤0.004%, P≤0.060%, molten iron temperature >=1350 DEG C, Si0.15-0.30% in hot metal composition, Mn0.95-1.3%, P0-0.01%, tapping temperature >=1600 DEG C, the tapping time cannot be less than 4min, tapping is to 1/3, and order adds Al-Mo, Fe-Cr, Ca-Fe-Nb-Ni-Cu, composite medium aluminium or aluminium block etc. and carries out component controlling, adds to tapping 2/3；
C.LF refine: refining time 35min, basicity of slag controls 3.3；
D.RH application of vacuum: control to arrive at a station liquid steel temperature at 1650 DEG C, the time that processes is at 10min；
E. continuous casting: adopt total process protective casting technique; in first heat, the bag degree of superheat must not be higher than 45 DEG C; even water the bag degree of superheat in heat and control at 15-30 DEG C; tundish uses low-carbon (LC) coverture; use square billet medium carbon steel covering slag; must on a small quantity, repeatedly add; to keep the top of the slag stable; middle water-coating port is strict centering in a crystallizer; insertion depth >=70mm, middle bag adopts and completely wraps casting, and changing Bao Shizhong bag liquid level must not lower than 400mm; taking the cast of permanent pulling rate according to section and molten steel overheat, liquid fluctuating controls within ± 5mm
F. ingot slow cool: hang in immediately after the steel ingot demoulding in slow cooling and carry out slow cooling, slow cooling temperature 400 DEG C, slow cooling time 48h；
G. steel ingot cleaning: steel ingot width 1/2 position is cleared up after terminating by ingot slow cool by flame gun, cleaning width control system is at 30-50CM, and cleaning severity control is at 5-10mm；
H. heating: heating-up temperature and heat time heating time are as follows: steel ingot enters warehouse temperature≤700 DEG C, stewing steel temperature 450-500 DEG C, time 4h, is warming up to a 100 DEG C/S of firing rate, is incubated 8h when temperature rises to 900 DEG C, it is warming up to two firing rate 100-120 DEG C/S, when temperature rises to 1000 DEG C, programming rate is not limit, and temperature rises to insulation 13h when 1260-1800 DEG C, then carries out turning over steel, after steel turning is intensification 2h to 1260-1280 DEG C again, then insulation 2h tapping；
I. rapid laminar cooling: it is 3～10 DEG C/s that cooldown rate controls, final cooling temperature presses 550～600 DEG C of controls, and the lower water yield and upper water yield Ratio control are 1.1～1.5；Last air cooling is to room temperature；
J. carrying out normalizing heat treatment: heat treatment temperature is 880～920 DEG C, time inside furnace is [thickness of slab (mm)+30～50] min, and the type of cooling is that mist is cold or section cooling, 2～5 DEG C/s of rate of cooling, and final cooling temperature is 650～750 DEG C。
Based on above-mentioned, adopt technical scheme, production cost is low, production efficiency is high, and the steel plate produced has high intensity, high tenacity, low yield strength ratio, good ductility, welding performance and cold and hot working performance, the uniform feature of thickness direction mechanical property。
The obvious present invention implements and is not subject to the restrictions described above; as long as have employed the improvement of the various unsubstantialities that the design of the method for the present invention carries out with technical scheme; or the not improved design by the present invention and technical scheme directly apply to other occasion, all within protection scope of the present invention。
Claims (6)
1. a structural steel, it is characterized in that, by mass percentage, described structural steel contains C0.18-0.35%, Si0.15-0.30%, Mn0.95-1.3%, P0-0.01%, Als0.015-0.04%, S0-0.002%, Mo0.15-0.17%, Cr0.7-0.8%, Ca0.002-0.008%, Nb0.015-0.03%, Ni0-0.1%, Cu0.15-0.25%, and surplus is ferrum and inevitable impurity。
2. a kind of structural steel according to claim 1, it is characterized in that: described structural steel contains C0.30%, Si0.20%, Mn0.95%, P0.01%, Als0.02%, S0.001%, Mo0.15%, Cr0.7%, Ca0.005%, Nb0.02%, Ni0.1%, Cu0.20%, surplus is ferrum and inevitable impurity。
3. the production technology of a structural steel, it is characterised in that described production technology specifically includes following steps:
A. desulfurizing iron: supplied materials liquid steel temperature controls at 1250～1300 DEG C, S≤0.008%, desulfurizing agent addition is every 100t molten steel 700KG, desulfurization terminal S≤0.004%；
B. converter smelting: enter stove molten iron S≤0.004%, P≤0.060%, molten iron temperature >=1350 DEG C, Si0.15-0.30% in hot metal composition, Mn0.95-1.3%, P0-0.01%, tapping temperature >=1600 DEG C, the tapping time cannot be less than 4min, tapping is to 1/3, and order adds Al-Mo, Fe-Cr, Ca-Fe-Nb-Ni-Cu, composite medium aluminium or aluminium block etc. and carries out component controlling, adds to tapping 2/3；
C.LF refine: refining time 35～50min, basicity of slag controls 3.3～3.8；
D.RH application of vacuum: control to arrive at a station liquid steel temperature at 1650～1670 DEG C, the time that processes is at 10～20min；
E. continuous casting: adopt total process protective casting technique; in first heat, the bag degree of superheat must not be higher than 45 DEG C; even water the bag degree of superheat in heat and control at 15-30 DEG C; tundish uses low-carbon (LC) coverture; use square billet medium carbon steel covering slag; must on a small quantity, repeatedly add; to keep the top of the slag stable; middle water-coating port is strict centering in a crystallizer; insertion depth >=70mm, middle bag adopts and completely wraps casting, and changing Bao Shizhong bag liquid level must not lower than 400mm; taking the cast of permanent pulling rate according to section and molten steel overheat, liquid fluctuating controls within ± 5mm
F. ingot slow cool: hang in immediately after the steel ingot demoulding in slow cooling and carry out slow cooling, slow cooling temperature 400-500 DEG C, slow cooling time 48-72h；
G. steel ingot cleaning: steel ingot width 1/2 position is cleared up after terminating by ingot slow cool by flame gun, cleaning width control system is at 30-50CM, and cleaning severity control is at 5-10mm；
H. heating: heating-up temperature and heat time heating time are as follows: steel ingot enters warehouse temperature≤700 DEG C, stewing steel temperature 450-500 DEG C, time 4h, is warming up to a 100 DEG C/S of firing rate, is incubated 8h when temperature rises to 900 DEG C, it is warming up to two firing rate 100-120 DEG C/S, when temperature rises to 1000 DEG C, programming rate is not limit, and temperature rises to insulation 13h when 1260-1800 DEG C, then carries out turning over steel, after steel turning is intensification 2h to 1260-1280 DEG C again, then insulation 2h tapping；
I. rapid laminar cooling: it is 3～10 DEG C/s that cooldown rate controls, final cooling temperature presses 550～600 DEG C of controls, and the lower water yield and upper water yield Ratio control are 1.1～1.5；Last air cooling is to room temperature；
J. carrying out normalizing heat treatment: heat treatment temperature is 880～920 DEG C, time inside furnace is [thickness of slab (mm)+30～50] min, and the type of cooling is that mist is cold or section cooling, 2～5 DEG C/s of rate of cooling, and final cooling temperature is 650～750 DEG C。
4. the production technology of a kind of structural steel according to claim 3, it is characterised in that: in described step c, refining time is 50min, and basicity of slag is 3.8。
5. the production technology of a kind of structural steel according to claim 3, it is characterised in that: in described step a, supplied materials molten iron temperature is 1300 DEG C。
6. the production technology of a kind of structural steel according to claim 3, it is characterised in that: slow cooling temperature 500 DEG C in described step f, slow cooling time 72h。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610186656.6A CN105695860A (en) | 2016-03-29 | 2016-03-29 | Structural steel and production technology thereof |
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| CN105886907A (en) * | 2016-06-30 | 2016-08-24 | 合肥慧林建材有限公司 | Structural steel and production process thereof |
| CN105886943A (en) * | 2016-06-27 | 2016-08-24 | 肥西县碧涛建材有限公司 | Constructional steel and production process |
| WO2018072550A1 (en) * | 2016-10-17 | 2018-04-26 | 江阴兴澄特种钢铁有限公司 | Continuous casting process for producing 450 mm ultra-thick blank on straight arc continuous casting machine |
| CN108866443A (en) * | 2018-07-19 | 2018-11-23 | 张家港宏昌钢板有限公司 | Normalizing type low yield strength ratio high-strength steel sheet and preparation method |
| CN109536822A (en) * | 2018-12-25 | 2019-03-29 | 山东钢铁股份有限公司 | A kind of rigging low-carbon carbon constructional quality steel and preparation method thereof |
| CN112267069A (en) * | 2020-09-30 | 2021-01-26 | 江苏省沙钢钢铁研究院有限公司 | Wire rod for 2100MPa grade galvanized steel wire and manufacturing method thereof |
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| CN105886943A (en) * | 2016-06-27 | 2016-08-24 | 肥西县碧涛建材有限公司 | Constructional steel and production process |
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| CN109536822A (en) * | 2018-12-25 | 2019-03-29 | 山东钢铁股份有限公司 | A kind of rigging low-carbon carbon constructional quality steel and preparation method thereof |
| CN109536822B (en) * | 2018-12-25 | 2020-06-16 | 山东钢铁股份有限公司 | Low-carbon high-quality carbon structural steel for rigging and preparation method thereof |
| CN112267069A (en) * | 2020-09-30 | 2021-01-26 | 江苏省沙钢钢铁研究院有限公司 | Wire rod for 2100MPa grade galvanized steel wire and manufacturing method thereof |
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