CN105018862B - A kind of 140mm thickness ductility steel plate and its manufacture method - Google Patents
A kind of 140mm thickness ductility steel plate and its manufacture method Download PDFInfo
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Abstract
The invention discloses 140mm thickness ductility steel plates, chemical composition is C by mass percentage：0.13~0.15%, Si：0.50~0.80%, Mn：0.40~0.65%, Ni：≤ 0.20%, Cr：1.30~1.50%, Mo：0.45~0.65%, Nb：0.005~0.020%, H：≤ 0.0002%, O：≤ 0.0020%, N：≤ 0.0040%, Alt：0.020~0.050%, surplus is Fe and inevitable impurity element；Raw material carries out the pretreatment converter smelting LF refining RH vacuum outgas continuous casting covering slow cooling heating rolling covering heaps slow cooling heat treatment of KR molten iron successively, 18 DEG C of side knock performances of gained steel plate center portion are more preferable, and steel billet is through maximum analog postwelding and minimum simulation postwelding excellent performance.
Description
Technical field
The invention belongs to steel plate manufacturing field, and in particular to a kind of thickness is 140mm ductility steel plates and its manufacture method.
Background technology
1.25Cr0.5MoSi steel plates are widely used in manufacturing oil, chemical industry, coal converting apparatus.China's oil, chemical industry at present
Rapid with coal conversion industry development, scrap build project is more, larger to the demand of this steel.Due to the steel high temperature, high pressure,
It to be on active service with hydrogen contact environment, condition of work is severe, and is possible to use at low ambient temperatures according to operating mode difference, therefore it is required that
With higher intensity, good toughness, excellent welding performance and anti-temper embrittlement performance.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of thickness for existing 1.25Cr0.5MoSi steel plates use situation
The steel plate for 140mm is spent, is used as petrochemical industry equipment steel, there is excellent low-temperature impact toughness, anti-lamellar tearing
Can, welding performance is good, and steel plate thickness direction hardness is uniform, and comprehensive mechanical property is excellent.
Another technical problem to be solved by this invention is to provide a kind of above-mentioned thickness of manufacture for above-mentioned state of the art
The manufacture method of tank plate.
Technical scheme is a kind of 140mm thickness ductility steel plate used by the present invention solves above-mentioned technical problem, the steel
The chemical composition of plate is C by mass percentage：0.13~0.15%, Si：0.50~0.80%, Mn：0.40~0.65%, P：≤
0.006%, S：≤ 0.001%, Ni：≤ 0.20%, Cr：1.30~1.50%, Mo：0.45~0.65%, Nb：0.005~0.020%,
Sb：≤ 0.003%, Sn：≤ 0.010%, As：≤ 0.012%, H：≤ 0.0002%, O：≤ 0.0020%, N：≤ 0.0040%,
Alt：0.020~0.050%, surplus is Fe and inevitable impurity element.
Further, 140mm thickness ductility steel plates of the invention, the horizontal Charpy v-notch ballistic work of -18 DEG C of its center portion
>=120J, steel plate through thickness direction Z-direction performance >=50%.
What the chemical composition of 140mm thickness ductility steel plate of the present invention was related such that：
In steel plate composition, C can significantly improve the intensity and hardness of steel plate, but plasticity and toughness are adversely affected,
C can increase quenching degree simultaneously；Reducing agent and deoxidier when Si is mainly as steel-making use, and have certain solution strengthening to make
With, but can such as cause the low-temperature flexibility of steel to reduce more than 0.80%, so Si controls are 0.6% or so；Mn is carried by solution strengthening
Gao Gang intensity is also favourable to toughness；Ni can improve the toughness and plasticity of steel, while also increase intensity, but too high Ni meetings
Increase cost, while can also destroy the performance of steel plate in itself, Ni of the invention is controlled below 0.20%；What Cr can be greatly improved
Quenching degree, the intensity and hardness of steel are improved, improve temper resistance, but reduce the toughness and plasticity of steel simultaneously；Cu is formed with Ni
Precipitated phase Ni3Cu is favourable to the high temperature creep property of steel；Mo is present in solid solution and carbide, can improve quenching degree and strong
Degree, improve temper resistance；P, S is harmful element, and P increases the fragility of steel, reduces the welding performance of steel, reduce plasticity and it is cold plus
Work performance, S reduce the ductility and toughness of steel, crackle are caused in hot procedure, therefore reduce P, S content as far as possible；Nb is formed
Nb（N,C）Precipitated phase improves recrystallization temperature, fining austenite grains, can effectively improve the intensity and toughness of steel；Sb、Sn、As
It is harmful element, easily in cyrystal boundary segregation, reduces the anti-temper embrittlement performance of steel, should try one's best reduction；O, N elemental gas should try one's best
Reduce, improve the degree of purity of steel, reduce inclusion content；The hydrogen embrittlement tendency of H increase steel, should try one's best reduces its content；Alt and oxygen
There is very strong affinity to be added mainly as deoxidier, the AlN that Alt and N is formed can fining austenite grains.
The technical scheme that the present invention solves another technical problem is to provide a kind of system of above-mentioned 140mm thickness ductility steel plate
Method is made, it is specific as follows：
Processing step is as follows：Raw materials for metallurgy pre-processes through KR molten iron successively, converter smelting：Skim, tapping temperature 1610~
1640 DEG C, converter tapping P≤0.005%, converter tapping temperature is 1610~1650 DEG C；LF is refined：The white slag retention time is not small
In 25min, total refining time is not less than 45min, skims during molten steel S≤0.003%；RH vacuum deaeration refinings：Vacuum≤
66Pa, vacuum retention time broken sky after more than 20min；Continuous casting, produce meet chemical composition requirement, thickness be 450mm or
Continuous casting billet above, to continuous casting billet covering slow cooling more than 72 hours, covering was to further reduce the H content of steel billet, slow cooling
After end to continuous casting billet surface band temperature clear up, it is ensured that continuous casting billet surface flawless etc. influence plate surface quality the defects of exist,
Cleaning temperature is maintained at more than 100 DEG C；Continuous casting billet is then reheated, using heat stepwise mode：The rate of heat addition be 10~
11min/cm, preheating section temperature be 650~900 DEG C, preheating section be incubated 3~3.5min/cm, the first bringing-up section temperature be 1000~
1200 DEG C, the first bringing-up section is incubated 3~3.5min/cm, and the second bringing-up section temperature is 1200~1260 DEG C, the insulation of the second bringing-up section
2~3min/cm, soaking zone temperature are 1150~1270 DEG C, and soaking zone is incubated 2~3min/cm, tapping temperature 1100~1260
℃；Steel billet is rolled after coming out of the stove：Start rolling temperature be 1050~1100 DEG C, single pass rolling reduction be 8%~20%, rolling it is total
Compression ratio is 3~5,850~900 DEG C of finishing temperature；After the completion of rolling, steel plate is offline in 400~500 DEG C of surface temperature, adds
Cover heap slow cooling, slow cooling more than 48 hours, the purpose that steel plate rolls rear slow cooling are the abundant H contents for reducing and being remained in steel plate, weaken H's
Harm；Normalizing and tempering heat treatment are finally carried out successively to steel billet, wherein, normalizing heating-up temperature is 920~950 DEG C, and normalizing is protected
The warm time is 1.8~3min/mm, is quickly cooled to less than 200 DEG C with water after coming out of the stove, water cooling speed >=0.5 DEG C/s；Tempering heating
Temperature is 710~750 DEG C, and tempering insulation time is 3~4.5min/mm, is cooled down after coming out of the stove, that is, obtains steel plate finished product.
Compared with prior art, the present invention has following features：
The present invention relates to a kind of 140mm thickness 1.25Cr0.5MoSi steel plates, not only thickness is big for the steel plate, anti-temper embrittlement
Excellent performance, welding performance is good and center portion low temperature impact properties are very high, is the best 140mm of current center portion impact property
Thickness 1.25Cr0.5MoSi steel plates, the horizontal Charpy v-notch ballistic work >=120J in -18 DEG C of 1/2 position of thickness of slab, impact value fluctuation
Small, steel plate through thickness direction Z-direction performance >=50%, steel plate whole plate hardness is uniform, steel plate thickness direction difference of hardness≤10HB, steel plate
Welding performance is good, and the Main Mechanical of steel plate meets the differences such as 1.25Cr0.5MoSi, SA387Gr11CL2,14Cr1MoR
The standard difference trade mark faces the technical requirements of hydrogen steel plate.
To achieve these goals, the present invention has low center using the component optimized, continuous casting billet produced by the invention
Segregation and center porosity, internal soundness are good.Ratio is refined and molded using VD for CN102732810B patent of invention with notification number
Compared with the present invention is produced using RH vacuum outgas and continuous casting, and can obtain lower hydrogen content ensures that steel plate has higher resist
Hydrogen induced cracking (HIC) ability.The internal soundness of continuous casting billet as being segregated, it is loose the defects of it is substantially fewer than static ingot, be advantageous to obtain excellent
Steel plate center portion performance.In addition, the cost that steel plate is produced using continuous casting process is also far below die casting process.
Steel plate is reheated before steel plate rolling, and uses stepwise heating mode, for the continuous casting steel billet of big thickness, table
The temperature difference of face and center portion is larger, and with thickness, formula changes temperature in gradient, and this also causes the crystalline phase of steel to be organized on thickness to exist
Difference, it is difficult to ensure the homogeneous of performance in steel table, especially center portion performance is difficult to control.Using Multi-stage heating mode, according to
The composition design of steel sets the heating-up temperature and soaking time in corresponding each stage, eliminates as far as possible between steel surface and center portion
The temperature difference, ensure that the performance of final steel plate whole plate is homogeneous.
In addition, the reheating of above-mentioned stepwise heating mode be the high temperature carried out therewith it is big pressure rolling premise, be all for
Eliminating difference in table, obtain the steel rolling of even tissue, the big pressure of high temperature fully ensures that roll-force can penetrate into blank center portion,
Ensure the refinement of steel plate core structure, improve center portion performance, laid the first stone to obtain preferably anti-temper embrittlement ability.
Due to using the big pressure rolling of high temperature, fully ensuring that roll-force can penetrate into blank center portion, it is ensured that the steel plate heart
The refinement of portion's tissue.Other steel mills are typically all using this steel grade of II type controlled rolling technique productions, and shortcoming is rolling time length,
Low production efficiency and drafts is small when rolling big thickness steel plate, steel plate center portion performance is difficult to ensure that.
The Technology for Heating Processing of steel plate of the present invention is first refined using the Particular craft of normalizing+quick water quenching+tempering by normalizing
Crystal grain, non-uniform components, then by rational temper, the normalizing formerly carried out and water quenching technology can reduce as much as possible
The segregation phenomena of element is that out-phase organizes the formation of in drawing process, makes last crystalline phase uniformly single, so that it is guaranteed that the heart of steel plate
Portion's low-temperature impact toughness, the steel plate is set to can be adapted to applicable, room temperature tensile and Z-direction function admirable under low temperature adverse circumstances, together
When also improve the anti-temper embrittlement abilities of steel.
Embodiment
The present invention is described in further detail with reference to embodiments.
Embodiment 1
The 140mm thickness ductility steel plates of the present embodiment, its chemical composition are by mass percentage：C：0.14%, Si：
0.59%, Mn：0.47%, P：0.004%, S：0.001%, Ni：0.19%, Cr：1.40%, Mo：0.63%, Nb：0.017%, Sb：
0.0009%, Sn：0.002%, As：0.0042%, H：0.0001%, O：0.002%, N：0.0035%, Alt：0.028%, surplus Fe
And inevitable impurity element.
The manufacturing process of the steel plate is raw materials for metallurgy to be configured by the chemical constituent of above-mentioned steel plate finished product, successively through KR molten iron
Pretreatment, converter smelting：Skim, 1610~1640 DEG C of tapping temperature, converter tapping P≤0.005%, converter tapping temperature is
1610~1650 DEG C；LF is refined：The white slag retention time is not less than 25min, and total refining time is not less than 45min, and molten steel S≤
Skimmed when 0.003%；RH vacuum deaeration refinings：Vacuum≤66Pa, vacuum retention time broken sky after more than 20min；Continuous casting,
Produce and meet that chemical composition requirement, thickness are 450mm thickness continuous casting billets, to continuous casting billet covering slow cooling 72 hours, further to drop
The H content of low steel billet, slow cooling are cleared up continuous casting billet surface band temperature after terminating, it is ensured that continuous casting billet surface flawless etc. influences steel plate table
The defects of face quality, is present, and cleaning temperature is maintained at more than 100 DEG C；Continuous casting billet is then reheated, using heat stepwise mode：Add
Hot speed is 11min/cm, and preheating section temperature is 800 DEG C, and preheating section insulation 3min/cm, the first bringing-up section temperature is 1000 DEG C,
First bringing-up section is incubated 3.5min/cm, and the second bringing-up section temperature is 1260 DEG C, the second bringing-up section insulation 2min/cm, soaking zone temperature
Spend for 1240 DEG C, soaking zone is incubated 2.5min/cm, 1260 DEG C of tapping temperature；Steel billet is through water under high pressure after coming out of the stove（Pressure >=21MPa）
De-scaling, rolled afterwards：Start rolling temperature is 1050~1100 DEG C, and previous three passes are using big pressure, single pass rolling reduction 8%
~20%, the overall compression ratio of rolling is 3.16,850~900 DEG C of finishing temperature；After the completion of rolling, steel plate surface temperature 400~
Offline at 500 DEG C, covering heap slow cooling, slow cooling more than 48 hours, the purpose that steel plate rolls rear slow cooling is that abundant reduce remains in steel plate
H content, weaken H harm；Normalizing and tempering heat treatment are finally carried out successively to steel billet, steel are sent into the thick fire of continuous oven adds
Heat, 930 DEG C of holding temperature, time inside furnace 2min/mm, is quenched after coming out of the stove using quenching press, and rapid water is cooled to less than 200 DEG C, water
Speed of cooling >=0.5 DEG C/s；After water cooling, enter continuous oven and carry out temper, tempering heating-up temperature is 730 DEG C, is tempered time inside furnace
For 3.5min/mm, cooled down after coming out of the stove, that is, obtain steel plate finished product.
Testing identity, the steel plate in the present embodiment have very high low-temperature impact work and numerical fluctuations smaller, and surrender is strong
Degree >=400MPa, tensile strength >=520MPa.Using normalizing（Accelerate cooling）+ tempering process, steel plate whole plate mechanical property is uniform,
Specific mechanical property is shown in Table 1.
Embodiment 2
The 140mm thickness ductility steel plates of the present embodiment, its chemical composition are by mass percentage：C：0.15%, Si：
0.61%, Mn：0.48%, P：0.005%, S：0.001%, Ni：0.18%, Cr：1.42%, Mo：0.62%, Nb：0.016%, Sb：
0.001%, Sn：0.0019%, As：0.0042%, H：0.00008%, O：0.0018%, N：0.0030%, Alt：0.030%, surplus is
Fe and inevitable impurity element.
The manufacturing process of the steel plate is raw materials for metallurgy to be configured by the chemical constituent of above-mentioned steel plate finished product, successively through KR molten iron
Pretreatment, converter smelting：Skim, 1610~1640 DEG C of tapping temperature, converter tapping P≤0.005%, converter tapping temperature is
1610~1650 DEG C；LF is refined：The white slag retention time is not less than 25min, and total refining time is not less than 45min, and molten steel S≤
Skimmed when 0.003%；RH vacuum deaeration refinings：Vacuum≤66Pa, vacuum retention time broken sky after more than 20min；Continuous casting,
Produce and meet that chemical composition requirement, thickness are 450mm thickness continuous casting billets, to continuous casting billet covering slow cooling 72 hours, further to drop
The H content of low steel billet, slow cooling are cleared up continuous casting billet surface band temperature after terminating, it is ensured that continuous casting billet surface flawless etc. influences steel plate table
The defects of face quality, is present, and cleaning temperature is maintained at more than 100 DEG C；Continuous casting billet is then reheated, using heat stepwise mode：Add
Hot speed is 10min/cm, and preheating section temperature is 750 DEG C, and preheating section insulation 3.5min/cm, the first bringing-up section temperature is 1180
DEG C, the first bringing-up section insulation 3.5min/cm, the second bringing-up section temperature is 1250 DEG C, the second bringing-up section insulation 3min/cm, soaking
Duan Wendu is 1220 DEG C, soaking zone insulation 2.5min/cm, 1260 DEG C of tapping temperature；Steel billet is through water under high pressure after coming out of the stove（Pressure >=
21MPa）De-scaling, rolled afterwards：Start rolling temperature is 1050~1100 DEG C, and previous three passes are using big pressure, single pass pressure
Measure as 8%~20%, the overall compression ratio of rolling is 3.6,850~900 DEG C of finishing temperature；After the completion of rolling, steel plate is in surface temperature
Offline at 400~500 DEG C, covering heap slow cooling, slow cooling more than 48 hours, the purpose that steel plate rolls rear slow cooling is abundant reduces in steel plate
The H content of residual, weaken H harm；Normalizing and tempering heat treatment are finally carried out successively to steel billet, it is thick that steel are sent into continuous oven
Fire heating, 920 DEG C of holding temperature, time inside furnace 2.5min/mm, quenched after coming out of the stove using quenching press, rapid water be cooled to 200 DEG C with
Under, water cooling speed >=0.5 DEG C/s；After water cooling, enter continuous oven and carry out temper, tempering heating-up temperature is 750 DEG C, is tempered in stove
Time is 3.5min/mm, is cooled down after coming out of the stove, that is, obtains steel plate finished product.
The present embodiment examines the state of sample blanks to have differences with embodiment 1, and specific difference is as follows：
In order to simulate stress-removal processing procedure after steel plate welding, sample blanks taken off from steel plate after first again in bogey by
26 hours are incubated according to 675 DEG C, be i.e. maximum analog post weld heat treatment, then carries out mechanical properties test again.
Testing identity, the steel plate in the present embodiment have very high low-temperature impact work and numerical fluctuations smaller, and surrender is strong
Degree >=380MPa, tensile strength >=550MPa.Using normalizing（Accelerate cooling）+ tempering process, steel plate whole plate mechanical property is uniform,
Specific mechanical property is shown in Table 1.
Embodiment 3
The 140mm thickness ductility steel plates of the present embodiment, its chemical composition are by mass percentage：C：0.15%, Si：
0.61%, Mn：0.48%, P：0.005%, S：0.001%, Ni：0.18%, Cr：1.42%, Mo：0.62%, Nb：0.015%, Sb：
0.001%, Sn：0.0019%, As：0.004%, H：0.00008%, O：0.0016%, N：0.0033%, Alt：0.030%, surplus is
Fe and inevitable impurity element.
The manufacturing process of the steel plate is raw materials for metallurgy to be configured by the chemical constituent of above-mentioned steel plate finished product, successively through KR molten iron
Pretreatment, converter smelting：Skim, 1610~1640 DEG C of tapping temperature, converter tapping P≤0.005%, converter tapping temperature is
1610~1650 DEG C；LF is refined：The white slag retention time is not less than 25min, and total refining time is not less than 45min, and molten steel S≤
Skimmed when 0.003%；RH vacuum deaeration refinings：Vacuum≤66Pa, vacuum retention time broken sky after more than 20min；Continuous casting,
Produce and meet that chemical composition requirement, thickness are 450mm thickness continuous casting billets, to continuous casting billet covering slow cooling 72 hours, further to drop
The H content of low steel billet, slow cooling are cleared up continuous casting billet surface band temperature after terminating, it is ensured that continuous casting billet surface flawless etc. influences steel plate table
The defects of face quality, is present, and cleaning temperature is maintained at more than 100 DEG C；Continuous casting billet is then reheated, using heat stepwise mode：Add
Hot speed is 10min/cm, and preheating section temperature is 750 DEG C, and preheating section insulation 3.5min/cm, the first bringing-up section temperature is 1180
DEG C, the first bringing-up section insulation 3.5min/cm, the second bringing-up section temperature is 1250 DEG C, the second bringing-up section insulation 3min/cm, soaking
Duan Wendu is 1220 DEG C, soaking zone insulation 2.5min/cm, 1260 DEG C of tapping temperature；Steel billet is through water under high pressure after coming out of the stove（Pressure >=
21MPa）De-scaling, rolled afterwards：Start rolling temperature is 1050~1100 DEG C, and previous three passes are using big pressure, single pass pressure
Measure as 8%~20%, the overall compression ratio of rolling is 3.6,850~900 DEG C of finishing temperature；After the completion of rolling, steel plate is in surface temperature
Offline at 400~500 DEG C, covering heap slow cooling, slow cooling more than 48 hours, the purpose that steel plate rolls rear slow cooling is abundant reduces in steel plate
The H content of residual, weaken H harm；Normalizing and tempering heat treatment are finally carried out successively to steel billet, it is thick that steel are sent into continuous oven
Fire heating, 920 DEG C of holding temperature, time inside furnace 2.5min/mm, quenched after coming out of the stove using quenching press, rapid water be cooled to 200 DEG C with
Under, water cooling speed >=0.5 DEG C/s；After water cooling, enter continuous oven and carry out temper, tempering heating-up temperature is 750 DEG C, is tempered in stove
Time is 3.5min/mm, is cooled down after coming out of the stove, that is, obtains steel plate finished product.
The present embodiment examines the state of sample blanks to have differences with embodiment 1, embodiment 2, and specific difference is as follows：
In order to simulate stress-removal processing procedure after steel plate welding, sample blanks taken off from steel plate after first again in bogey by
8 hours are incubated according to 675 DEG C, i.e., minimum Simulated post-weld heat treatment, then carries out mechanical properties test again.
Testing identity, the steel plate in the present embodiment have very high low-temperature impact work and numerical fluctuations smaller, and surrender is strong
Degree >=380MPa, tensile strength >=550MPa.Using normalizing（Accelerate cooling）+ tempering process, steel plate whole plate mechanical property is uniform,
Specific mechanical property is shown in Table 1.
The mechanical performance for the steel plate that 1 each embodiment of table is produced
- 18 DEG C of low-temperature impact toughness are most implacable performance requirements in big thickness ductility steel plate mechanical property, are indulged
Meet to impact is relatively easy, but steel plate center portion（I.e. at 1/2 thickness of slab）Side knock performance is but difficult to reach.Present invention quenching
The transverse impact toughness of+Annealed Strip steel plate is in more than 198J.As equipment container steel plate, usually require that plate property not only
It can meet the performance of the quenching+tempering condition of delivery, also require that sample is simulated at postwelding heat by maximum analog postwelding and minimum
The performance requirement of the condition of delivery can also be reached by managing later performance, and Simulated post-weld heat treatment can reduce low temperature punching to some extent
Hit toughness.The steel plate of the present invention in sample after maximum analog postwelding and minimum Simulated post-weld heat treatment, put down by low-temperature impact toughness
Average is still in more than 189J and without the big fluctuation of appearance.
Big thickness ductility steel plate produced by the invention also has excellent Z-direction performance.The performance is except reaction steel plate
Its compactness has also been reacted outside anti-lamellar tearing ability.The Z-direction performance of big thickness high tenacity tank plate produced by the invention
Peak demand of the conventional criteria to steel plate Z-direction performance 35% is exceeded.Show the big thickness high tenacity that continuous casting billet produces in the present invention
Tank plate is not only with high anti-lamellar tearing ability but also with high consistency, so as to ensure that steel plate to center portion performance
Rigors.
The present invention has advantages below：1. -18 DEG C of side knock performances of steel plate center portion are more preferable；2. maximum analog postwelding and most
Small simulation postwelding excellent performance；3. steel plate of the present invention uses converter+continuous casting process, production cost is low compared with electric furnace+molding, is advantageous to
Reduce equipment manufacturing costs.
Claims (1)
- A kind of 1. 140mm thickness ductility steel plate, it is characterised in that：The chemical composition of the steel plate is C by mass percentage： 0.13~0.15%, Si：0.50~0.80%, Mn：0.40~0.65%, P：≤ 0.006%, S：≤ 0.001%, Ni：0.18 ~0.20%, Cr：1.30~1.50%, Mo：0.45~0.65%, Nb：0.005~0.020%, Sb：≤ 0.003%, Sn：≤ 0.010%, As：≤ 0.012%, H：≤ 0.0002%, O：≤ 0.0020%, N：≤ 0.0040%, Alt：0.020~ 0.050%, surplus is Fe and inevitable impurity element；Steel plate manufacturing technology steps are as follows：Raw materials for metallurgy pre-processes through KR molten iron successively, converter smelting：Skim, tapping temperature 1610~1640 DEG C, converter tapping P≤0.005%, converter tapping temperature is 1610~1650 DEG C；LF refining：When white slag is kept Between be not less than 25min, total refining time is not less than 45min, skims during molten steel S≤0.003%；RH vacuum deaeration refinings：Vacuum Degree≤66Pa, vacuum retention time broken sky after more than 20min；Continuous casting, produce and meet that chemical composition requirement, thickness are 450mm or more continuous casting billet, to continuous casting billet covering slow cooling more than 72 hours, slow cooling terminate after to continuous casting billet surface band Wen Qing Reason, cleaning temperature are maintained at more than 100 DEG C；Continuous casting billet is then reheated, using heat stepwise mode：The rate of heat addition be 10~ 11min/cm, preheating section temperature be 650~900 DEG C, preheating section be incubated 3~3.5min/cm, the first bringing-up section temperature be 1000~ 1200 DEG C, the first bringing-up section is incubated 3~3.5min/cm, and the second bringing-up section temperature is 1200~1260 DEG C, the insulation of the second bringing-up section 2~3min/cm, soaking zone temperature are 1150~1270 DEG C, and soaking zone is incubated 2~3min/cm, tapping temperature 1100~1260 ℃；Steel billet is rolled after coming out of the stove：Start rolling temperature is 1050~1100 DEG C, and single pass rolling reduction is 8%~20%, rolling Overall compression ratio is 3~5,850~900 DEG C of finishing temperature；After the completion of rolling, steel plate is offline in 400~500 DEG C of surface temperature, Covering heap slow cooling, slow cooling more than 48 hours；Normalizing and tempering heat treatment are finally carried out successively to steel billet, wherein, normalizing heating temperature Spend for 920~950 DEG C, normalizing soaking time is 1.8~3min/mm, is quickly cooled to less than 200 DEG C with water after coming out of the stove, water cooling Speed >=0.5 DEG C/s；Tempering heating-up temperature is 710~750 DEG C, and tempering insulation time is 3~4.5min/mm, is cooled down after coming out of the stove, Obtain steel plate finished product.
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| CN111074162A (en) * | 2019-11-28 | 2020-04-28 | 舞阳钢铁有限责任公司 | Steel plate for boiler head and production method thereof |
| CN114411058B (en) * | 2022-01-06 | 2022-11-18 | 南京钢铁股份有限公司 | Heat-resistant steel plate for longitudinal submerged arc welded pipe and production method thereof |
| CN115572918B (en) * | 2022-10-19 | 2024-01-26 | 宝武杰富意特殊钢有限公司 | Manufacturing method of steel for rotating shaft |
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| JP2743765B2 (en) * | 1993-03-30 | 1998-04-22 | 住友金属工業株式会社 | Cr-Mo steel plate for pressure vessel and method for producing the same |
| JP2001303173A (en) * | 2000-04-26 | 2001-10-31 | Mitsubishi Seiko Muroran Tokushuko Kk | Steel for carburizing and carbo-nitriding |
| CN102162065B (en) * | 2011-03-27 | 2012-08-22 | 莱芜钢铁集团有限公司 | 550Mpa yield-strength low-carbon bainitic steel for engineering machinery and preparation method thereof |
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