CN102080187A - Large-thickness Cr-Mo system 12Cr2Mo1R container steel and production method thereof - Google Patents
Large-thickness Cr-Mo system 12Cr2Mo1R container steel and production method thereof Download PDFInfo
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Abstract
The invention discloses large-thickness Cr-Mo system 12Cr2Mo1R container steel and a production method thereof. Under the process sequences of high quality molten iron and KR molten iron pretreatment, 100 ton top and bottom combined blown converter, argon-blowing treatment, low frequency (LF) furnace refinement, die casting pouring, walking beak reheating furnace, 3800-meter rolling mill, activated calcium carbonate (ACC) laminar flow cooling, 11 roller hot strainghtener, stack cooling, tempering, finishing, outer detecting, fault detecting and warehousing, various property indexes of the container steel are ensured through tempering, thereby meeting the idea demands of users. In the production method, fine grain elements such as Nb, V, Ti and the like are not added; and the large-thickness container steel is produced by virtue of a low carbon equivalent design, a controlled rolling and controlled cooling process and a tempering production process, is a 12Cr2Mo1R steel plate with the thickness of 120-150 millimeters, maintains Maddox position direction of sorbite steel, and has the advantages of good ductility and toughness and favorable high-temperature tensile property.
Description
Technical field
The present invention relates to the super-thick steel plate production technical field, being specifically related to a kind of big thickness C r-Mo is 12Cr2Mo1R container steel and production method thereof.
Background technology
12Cr2Mo1R is used for high temperature high pressure such as petrochemical complex, nuclear power, steam turbine cylinder, thermoelectricity, connects true main equipment with hydrogen or hydrogen blending agent, the producer that present each iron and steel enterprise can produce special thick specification 12Cr2Mo1R is very few, in addition, the 12Cr2Mo1R steel grade of the above specification of 120mm on the domestic market, because of producer can't guarantee flaw detection, performance, apparent availability is few, if dependence on import, not only price is expensive, and receipt period is long, can't guarantee the normal operation of engineering.Accelerate restructuring, the disadvantageous effect that the reply international financial crisis brings promotes industrial upgrading, realizes differentiation strategy, strengthens enterprise competitiveness and has a very important role.
Summary of the invention
The object of the present invention is to provide a kind of big thickness C r-Mo is 12Cr2Mo1R container steel and production method thereof.
A kind of big thickness C r-Mo is the 12Cr2Mo1R container steel, (unit, wt%): C:0.10～0.14, Si:0.20～0.50, Mn:0.30～0.60, P :≤0.018, S :≤0.010, Cr:2.00～2.50, Mo 0.90-1.10AlS :≤0.040, other is Fe and relict element to comprise following chemical components in mass percent.
Above-mentioned big thickness C r-Mo is the 12Cr2Mo1R container steel, and described steel plate thickness is 120～150mm.
For achieving the above object, in smelting process, P (phosphorus), S (sulphur) in the strict control steel, etc. harmful element, guarantee that the purity of molten steel reaches the Clean Steel level substantially.In follow-up rolling heat-processed, improve finishing temperature, prevent the excessive crackle that causes of steel plate internal stress, improve its viscous deformation.Steel plate rolling finishes the slow cooling of laggard windrow buttress, eliminates the steel plate internal stress, adopts modifier treatment afterwards, can guarantee steel alloy 12Cr2Mo1R steel plate plate performance requirement.
Above-mentioned big thickness C r-Mo is the production method of 12Cr2Mo1R container steel, comprises following main technique:
A. smelting technology: on container steel standard analysis basis, dwindle its internal control scope, P (phosphorus) in the strict control steel, S (sulphur), Deng harmful element, the purity that guarantees the 30t molten steel reaches the Clean Steel level substantially, through converter smelting, send into the refining of LF refining furnace, and hello Al line 400m, bull ladle VD stove vacuum-treat during big bag temperature 〉=1600 ℃, add SiCa piece 80～120Kg before the vacuum, vacuum tightness is not more than 0.5 torr, destroys vacuum during vacuum hold-time 〉=20 minute, solve molten steel and depended merely on the deoxidation of Al line, the phenomenon that nonmetallic inclusionsin steel content is higher has guaranteed the purity of steel;
B. casting process: the empty back temperature of destroying of fidelity adopts 33t slab ingot mould to cast at 1545～1549 ℃ then, guarantees that big thickness, big substance steel plate have the enough draught and the raw material of becoming a useful person;
C. heating: occur bursting for avoiding surface of steel ingot, steel ingot realizes that temperature is sent, Wen Qing, temperature dress, dried in the air stove more than 30 minutes before the dress steel, stewing steel 2.5 hours, tiny for guaranteeing the abundant solid solution of alloying element, r crystal grain, adopt low speed to burn steel, heat-up rate below 1000 ℃≤120 ℃/h, 1270 ℃ of maximum heating temperatures;
D., controlled rolling process: adopt two stage controlled rolling process, the fs is the austenite recrystallization stage, between 950～1150 ℃, most of reductions in pass of this stage are 8～25%, accumulative total draft 〉=70% makes austenite generation perfect recrystallization, with refine austenite crystal grain; Subordinate phase is the non-recrystallize stage of austenite, start rolling temperature is≤920 ℃, finishing temperature is≤900 ℃, and in this stage, austenite crystal is elongated, form high-density mechanical twin and deformed belt in the austenite of non-recrystallization in elongation, simultaneously microalloy carbon, nitride are separated out because of deformation induced, thereby have increased ferritic nucleation site, refinement ferrite crystal grain, this stage draft should be tried one's best greatly, accumulative total draft 〉=50%;
E. cooling control technology: the steel plate after rolling carries out online cooling at the ACC quickly cooling device, and returning red temperature is 650～700 ℃; Stacking slow cooling was 48 hours after steel plate rolled off the production line, and prevented that the steel plate internal stress from having little time to discharge and form internal fissure;
F., thermal treatment process: steel plate is carried out modifier treatment, and the fiery temperature of quenching is 910 ± 10 ℃, and the time is incubated by 2.0min/mm, and shove charge is immediately carried out tempering for 650 ± 10 ℃ after the quenching, and the time is incubated by 4.5min/mm, the air cooling of coming out of the stove.
The present invention high-quality molten iron, KR hot metal pretreatment, 100 tons of top and bottom combined blown converters, Argon processing, the refining of LF stove, die casting cast, walking beam furnace, 3800m milling train, the cooling of ACC laminar flow, 11 roller thermal straightening machines, cooling in heap, modified, finishing, outside under the process sequence of inspection, flaw detection, warehouse-in, beneficial effect of the present invention is: by modifier treatment, guarantee its every performance index, satisfy the desirable demand of user.Do not add crystal grain thinning elements such as Nb, V, Ti, keep the martensite position to the sorbite steel, be by the design of low-carbon-equivalent composition and controlled rolling and controlled cooling+modified production technique, produce big thickness container steel: the thick 12Cr2Mo1R steel plate of 120-150mm has good plasticity and toughness energy and high temperature tensile properties; The present invention has the following advantages: (1) steel of the present invention is purer, P≤0.015%, S≤0.003%; (2) do not add crystal grain thinning elements such as Nb, V, Ti; (3) high-temperature behavior is good; (4) thickness of steel plate reaches 120-150mm.
Embodiment
The present invention adopts converter smelting die casting cast, the method production steel that the 3800m wide and heavy plate mill is rolling.Its whole technical process is: high-quality molten iron, KR hot metal pretreatment, 100 tons of top and bottom combined blown converters, Argon processing, the refining of LF stove, die casting cast, walking beam furnace, 3800m milling train, the cooling of ACC laminar flow, 11 roller thermal straightening machines, cooling in heap, modified, finishing, outer inspection, flaw detection, warehouse-in.
Embodiment one: a kind of big thickness C r-Mo is the 12Cr2Mo1R container steel, comprise following chemical components in mass percent (unit, wt%): C:0.11, Si:0.45, Mn:0.35, P:0.017, S:0.004, Cr:2.00, Mo 1.10AlS:0.040, other is Fe and relict element;
Embodiment two
A kind of big thickness C r-Mo is the 12Cr2Mo1R container steel, comprise following chemical components in mass percent (unit, wt%): C:0.14, Si:0.25, Mn:0.55, P:0.010, S:0.010, Cr:2.50, Mo 0.90, AlS:0.020, other is Fe and relict element;
Embodiment three
A kind of big thickness C r-Mo is the 12Cr2Mo1R container steel, comprise following chemical components in mass percent (unit, wt%): C:0.12, Si:0.35, Mn:0.45, P:0.013, S:0.007, Cr:2.20, Mo 1.00, AlS:0.030, other is Fe and relict element;
Above-mentioned big thickness C r-Mo is the 12Cr2Mo1R container steel, and described steel plate thickness is 120～150mm.
For achieving the above object, in smelting process, P (phosphorus), S (sulphur) in the strict control steel, etc. harmful element, guarantee that the purity of molten steel reaches the Clean Steel level substantially.In follow-up rolling heat-processed, improve finishing temperature, prevent the excessive crackle that causes of steel plate internal stress, improve its viscous deformation.Steel plate rolling finishes the slow cooling of laggard windrow buttress, eliminates the steel plate internal stress, adopts modifier treatment afterwards, can guarantee that steel alloy 12Cr2Mo1R steel plate polarity can demand.
Above-mentioned big thickness C r-Mo is the production method of 12Cr2Mo1R container steel, comprises following main technique:
A. smelting technology: on container steel standard analysis basis, dwindle its internal control scope, P (phosphorus) in the strict control steel, S (sulphur), Deng harmful element, the purity that guarantees the 30t molten steel reaches the Clean Steel level substantially, through converter smelting, send into the refining of LF refining furnace, and hello Al line 400m, bull ladle VD stove vacuum-treat during big bag temperature 〉=1600 ℃, add SiCa piece 80～120Kg before the vacuum, vacuum tightness is not more than 0.5 torr, destroys vacuum during vacuum hold-time 〉=20 minute, solve molten steel and depended merely on the deoxidation of Al line, the phenomenon that nonmetallic inclusionsin steel content is higher has guaranteed the purity of steel; B. casting process: the empty back temperature of destroying of fidelity adopts 33t slab ingot mould to cast at 1545～1549 ℃ then, guarantees that big thickness, big substance steel plate have the enough draught and the raw material of becoming a useful person; C. heating: occur bursting for avoiding surface of steel ingot, steel ingot realizes that temperature is sent, Wen Qing, temperature dress, dried in the air stove more than 30 minutes before the dress steel, stewing steel 2.5 hours, tiny for guaranteeing the abundant solid solution of alloying element, r crystal grain, adopt low speed to burn steel, heat-up rate below 1000 ℃≤120 ℃/h, 1270 ℃ of maximum heating temperatures; D., controlled rolling process: adopt two stage controlled rolling process, the fs is the austenite recrystallization stage, between 950～1150 ℃, most of reductions in pass of this stage are 8～25%, accumulative total draft 〉=70% makes austenite generation perfect recrystallization, with refine austenite crystal grain; Subordinate phase is the non-recrystallize stage of austenite, start rolling temperature is≤920 ℃, finishing temperature is≤900 ℃, and in this stage, austenite crystal is elongated, form high-density mechanical twin and deformed belt in the austenite of non-recrystallization in elongation, simultaneously microalloy carbon, nitride are separated out because of deformation induced, thereby have increased ferritic nucleation site, refinement ferrite crystal grain, this stage draft should be tried one's best greatly, accumulative total draft 〉=50%; E. cooling control technology: the steel plate after rolling carries out online cooling at the ACC quickly cooling device, and returning red temperature is 650～700 ℃; Stacking slow cooling was 48 hours after steel plate rolled off the production line, and prevented that the steel plate internal stress from having little time to discharge and form internal fissure; F., thermal treatment process: steel plate is carried out modifier treatment, and the fiery temperature of quenching is 910 ± 10 ℃, and the time is incubated by 2.0min/mm, and shove charge is immediately carried out tempering for 650 ± 10 ℃ after the quenching, and the time is incubated by 4.5min/mm, the air cooling of coming out of the stove.
Interpretation of result
Mechanical mechanics property is analyzed
Composition and mechanical mechanics property are pressed GB/T3077-1999 and are carried out, and specifically see Table 1.
Table 1 conventional mechanical property
Mechanical behavior under high temperature sees Table 2
The result is as follows for this experimental performance:
The chemical composition design of steel plate of the present invention adopts low-carbon-equivalent, do not add crystal grain thinning elements such as Nb, V, Ti, keep the martensite position to the sorbite steel, be by the design of low-carbon-equivalent composition and controlled rolling and controlled cooling+modified production technique, produce big thickness container steel: the thick 12Cr2Mo1R steel plate of 120-150mm has good plasticity and toughness energy and high temperature tensile properties; The present invention has the following advantages: (1) steel of the present invention is purer, P≤0.015%, S≤0.003%; (2) do not add crystal grain thinning elements such as Nb, V, Ti; (3) high-temperature behavior is good; (4) thickness of steel plate reaches 120-150mm.
Claims (3)
1. a big thickness C r-Mo is the 12Cr2Mo1R container steel, it is characterized in that: (unit, wt%): C:0.10～0.14, Si:0.20～0.50, Mn:0.30～0.60, P :≤0.018, S :≤0.010, Cr:2.00～2.50, Mo 0.90-1.10AlS :≤0.040, other is Fe and relict element to comprise following chemical components in mass percent.
2. above-mentioned big thickness C r-Mo as claimed in claim 1 is the 12Cr2Mo1R container steel, it is characterized in that: described steel plate thickness is 120～150mm.
3. big thickness C r-Mo as claimed in claim 1 is the production method of 12Cr2Mo1R container steel, it is characterized in that: comprise following main technique:
A. smelting technology: on container steel standard analysis basis, dwindle its internal control scope, P (phosphorus) in the strict control steel, S (sulphur), Deng harmful element, the purity that guarantees the 30t molten steel reaches the Clean Steel level substantially, through converter smelting, send into the refining of LF refining furnace, and hello Al line 400m, bull ladle VD stove vacuum-treat during big bag temperature 〉=1600 ℃, add SiCa piece 80～120Kg before the vacuum, vacuum tightness is not more than 0.5 torr, destroys vacuum during vacuum hold-time 〉=20 minute, solve molten steel and depended merely on the deoxidation of Al line, the phenomenon that nonmetallic inclusionsin steel content is higher has guaranteed the purity of steel;
B. casting process: the empty back temperature of destroying of fidelity adopts 33t slab ingot mould to cast at 1545～1549 ℃ then, guarantees that big thickness, big substance steel plate have the enough draught and the raw material of becoming a useful person;
C. heating: occur bursting for avoiding surface of steel ingot, steel ingot realizes that temperature is sent, Wen Qing, temperature dress, dried in the air stove more than 30 minutes before the dress steel, stewing steel 2.5 hours, tiny for guaranteeing the abundant solid solution of alloying element, r crystal grain, adopt low speed to burn steel, heat-up rate below 1000 ℃≤120 ℃/h, 1270 ℃ of maximum heating temperatures;
D., controlled rolling process: adopt two stage controlled rolling process, the fs is the austenite recrystallization stage, between 950～1150 ℃, most of reductions in pass of this stage are 8～25%, accumulative total draft 〉=70% makes austenite generation perfect recrystallization, with refine austenite crystal grain; Subordinate phase is the non-recrystallize stage of austenite, start rolling temperature is≤920 ℃, finishing temperature is≤900 ℃, and in this stage, austenite crystal is elongated, form high-density mechanical twin and deformed belt in the austenite of non-recrystallization in elongation, simultaneously microalloy carbon, nitride are separated out because of deformation induced, thereby have increased ferritic nucleation site, refinement ferrite crystal grain, this stage draft should be tried one's best greatly, accumulative total draft 〉=50%;
E. cooling control technology: the steel plate after rolling carries out online cooling at the ACC quickly cooling device, and returning red temperature is 650～700 ℃; Stacking slow cooling was 48 hours after steel plate rolled off the production line, and prevented that the steel plate internal stress from having little time to discharge and form internal fissure;
F., thermal treatment process: steel plate is carried out modifier treatment, and the fiery temperature of quenching is 910 ± 10 ℃, and the time is incubated by 2.0min/mm, and shove charge is immediately carried out tempering for 650 ± 10 ℃ after the quenching, and the time is incubated by 4.5min/mm, the air cooling of coming out of the stove.
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| CN102312160A (en) * | 2011-07-08 | 2012-01-11 | 南阳汉冶特钢有限公司 | 12Cr2Mo1R steel plate for ultra-thick hydrogen-contacting equipment and production method thereof |
| CN102409238A (en) * | 2011-06-28 | 2012-04-11 | 南阳汉冶特钢有限公司 | 42CrMo alloy constructional steel super-thick plate and production method thereof |
| CN103352172A (en) * | 2013-05-28 | 2013-10-16 | 武汉钢铁(集团)公司 | Sea platform steel having thickness of 150mm, and production method thereof |
| CN103710628A (en) * | 2013-12-30 | 2014-04-09 | 南阳汉冶特钢有限公司 | Large-thickness hydrogenating 14Cr1MoR steel plate and production method thereof |
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| CN114318110A (en) * | 2021-12-23 | 2022-04-12 | 舞阳钢铁有限责任公司 | Production method of hydrogen induced cracking resistant 12Cr2Mo1R steel plate |
| CN114410895A (en) * | 2021-12-29 | 2022-04-29 | 舞阳钢铁有限责任公司 | Method for reducing quenching deformation of alloy steel |
| CN114410895B (en) * | 2021-12-29 | 2024-01-23 | 舞阳钢铁有限责任公司 | Method for reducing quenching deformation of alloy steel |
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