CN103602891B - The production method of the ductility steel plate of yield strength 460MPa level - Google Patents
The production method of the ductility steel plate of yield strength 460MPa level Download PDFInfo
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Abstract
The invention discloses a kind of production method of ductility steel plate of yield strength 460MPa level, comprising: continuously cast bloom heating, rolling and cooling.The present invention adopts low-carbon (LC) to design, and adopts suitable controlled rolling and cooling control technology, makes the ferrite crystal grain of steel plate tiny, toughness and welding property good; Operational path is simple, with short production cycle, low cost of manufacture, and process system is relatively loose, can on generous printed line stably manufactured.
Description
Technical field
The present invention relates to plate of moderate thickness manufacturing technology field, specifically, relate to a kind of production method of ductility steel plate of yield strength 460MPa level.
Background technology
Yield strength is that the steel plate of 460MPa level is used on the engineering machinery such as Coal Mechanical, jack lift and cargo truck in a large number.Because engineering machinery and cargo truck usually will bear greater impact load, and often also to use under the environment of cold, therefore require that steel plate has good toughness, especially low-temperature flexibility.Usually need to be cut into different shape according to design when steel plate is used, weld as required again during producing apparatus, therefore the welding property of steel plate is extremely important, welding property determines steel plate weldment quality and welding speed, welding speed directly affects the production cycle of product, and welding quality directly affects the safe mass of the finished product.Along with developing rapidly of the field such as engineering machinery and cargo truck, market is 460MPa level steel plate in the urgent need to a large amount of toughness and the good yield strength of welding property.
Current domestic existing Duo Jia steel mill production yield strength is the steel plate of 460MPa level.These steel plate carbon contents of prior art are 0.07 ~ 0.1%, and carbon content is higher, belongs to peritectic steel.Slab, when continuous casting, owing to there is Peritectic Reaction during molten steel solidification, easily cracks in steel slab surface, and causes final steel plate to occur crackle, affect plate surface quality; Steel plate finishing temperature requires lower simultaneously, and during rolling, the load of milling train is large, easily has device security accident.In addition, the poor toughness of these steel plates existing, the ballistic work of-40 DEG C only has about 50J.Moreover existing manufacturing process is complicated, and controlled rolling+cooling control technology basis adds the thermal treatment process of normalizing, cause that manufacturing cost rises, the production cycle is longer; Add the expensive metal Ni of 0.15% ~ 0.40%, make alloy content higher, the cost of alloy of steel plate is high.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of production method of ductility steel plate of yield strength 460MPa level, and operational path is simple, with short production cycle, low cost of manufacture.
Technical solution of the present invention is as follows:
A production method for the ductility steel plate of yield strength 460MPa level, comprising: continuously cast bloom heating, rolling and cooling, and the tapping temperature of described continuously cast bloom heating is 1180-1230 DEG C, and heat-up time is 250 ~ 440 minutes; Described rolling comprises first stage rolling and subordinate phase rolling, and during described first stage rolling open rolling, the thickness of slab is the thickness of described continuously cast bloom; The start rolling temperature of described first stage rolling is 1175 ~ 1225 DEG C, finishing temperature >=980 DEG C of described first stage rolling, and the rolling pass number of described first stage rolling is 5 ~ 10, and roll speed is not more than 2.0m/s, has at least twice draft to be greater than 15%; During described subordinate phase rolling open rolling, the thickness of slab is the 2-3.5 doubly thickness of the ductility steel plate of yield strength 460MPa level that obtains of described production, the start rolling temperature of described subordinate phase rolling is 890 ~ 960 DEG C, the finishing temperature of described subordinate phase rolling is 840 ~ 890 DEG C, and the rolling pass number of described subordinate phase rolling is 5 ~ 7; Describedly be cooled to section cooling, speed of cooling is 8 ~ 25 DEG C/s, and final cooling temperature is 590 ~ 630 DEG C; The mass percentage producing the material of the ductility steel plate of the yield strength 460MPa level obtained comprises: C0.05 ~ 0.08%, Si0.2 ~ 0.4%, Mn1.2 ~ 1.6%, P≤0.02%, S≤0.01%, Nb0.04 ~ 0.06%, V0.04 ~ 0.07%, Ti0.006 ~ 0.012%, Ca0.0015 ~ 0.003%, Als0.017 ~ 0.027%, all the other are iron and impurity.
Further, the mass percentage producing the material of the ductility steel plate of the yield strength 460MPa level obtained comprises: C0.074%, Si0.24%, Mn1.5%, P0.007%, S0.005%, Nb0.052%, V0.058%%, Ti0.012%, Ca0.0027%, Als0.023%; Or, C0.074%, Si0.24%, Mn1.5%, P0.007%, S0.005%, Nb0.052%, V0.058%, Ti0.012%, Ca0.0027%, Als0.024%; Or, C0.05%, Si0.25%, Mn1.6%, P0.011%, S0.01%, Nb0.06%, V0.04%, Ti0.01%, Ca0.0018%, Als0.017%; Or, C0.08%, Si0.2%, Mn1.5%, P0.02%, S0.004%, Nb0.04%, V0.06%, Ti0.008%, Ca0.003%, Als0.025%; Or, C0.07%, Si0.4%, Mn1.2%, P0.009%, S0.005%, Nb0.045%, V0.07%, Ti0.006%, Ca0.0015%, Als0.027%.
Technique effect of the present invention is as follows:
1, the present invention adopts low-carbon (LC) to design, and by adopting suitable controlled rolling and cooling control technology, make the ferrite crystal grain of steel plate tiny, toughness and the welding property of steel plate are good.
2, the low-temperature impact toughness of the material of steel plate of the present invention is good, and the ballistic work of-40 DEG C is at more than 236J.
3, the yield strength of steel plate of the present invention is between 510 ~ 525MPa, tensile strength between 575 ~ 585MPa, unit elongation >=25%.
4, the Composition Design of steel plate of the present invention is reasonable, operational path is simple, with short production cycle, low cost of manufacture, and process system is relatively loose, can on generous printed line stably manufactured.
Accompanying drawing explanation
Fig. 1 is the metallographic structure figure of the steel plate of embodiments of the invention 1;
Fig. 2 is the metallographic structure figure of the steel plate of embodiments of the invention 2;
Fig. 3 is the metallographic structure figure of the steel plate of embodiments of the invention 3;
Fig. 4 is the metallographic structure figure of the steel plate of embodiments of the invention 4;
Fig. 5 is the metallographic structure figure of the steel plate of embodiments of the invention 5.
Embodiment
The ductility steel plate of yield strength 460MPa level of the present invention is prepared on the basis of continuously cast bloom.Require the as follows of the mass percentage of the chemical composition of continuously cast bloom used: C0.05 ~ 0.08%, Si0.2 ~ 0.4%, Mn1.2 ~ 1.6%, P≤0.02%, S≤0.01%, Nb0.04 ~ 0.06%, V0.04 ~ 0.07%, Ti0.006 ~ 0.012%, Ca0.0015 ~ 0.003%, Als0.017 ~ 0.027%, all the other are iron and impurity.
The flow process of the production method of the ductility steel plate of yield strength 460MPa level of the present invention is as follows:
Step S1: continuously cast bloom heats
The tapping temperature of continuously cast bloom heating is 1180-1230 DEG C, and heat-up time is 250 ~ 440 minutes.
Step S2: rolling
Rolling comprises first stage rolling and subordinate phase rolling.
During first stage rolling open rolling, the thickness of slab is the thickness of continuously cast bloom.The start rolling temperature of first stage rolling is 1175 ~ 1225 DEG C.Finishing temperature >=980 DEG C of first stage rolling.The rolling pass number of first stage rolling is 5 ~ 10.
During subordinate phase rolling open rolling, the thickness of slab is the thickness that 2-3.5 doubly produces the ductility steel plate of the yield strength 460MPa level obtained.The start rolling temperature of subordinate phase rolling is 890 ~ 960 DEG C.The finishing temperature of subordinate phase rolling is 840 ~ 890 DEG C.The rolling pass number of subordinate phase rolling is 5 ~ 7.
The present invention be in austenite recrystallization district, Unhydrated cement carries out controlled rolling to the above-mentioned continuously cast bloom heated.Above-mentioned first stage rolling is the controlled rolling of austenite recrystallization district.This one-phase adopts the rolling strategy of low speed, large pressure, requires that roll speed is not more than 2.0m/s, has at least twice draft to be greater than 15%, by austenitic recrystallize repeatedly, abundant fining austenite grains, increases grain boundary area, increases the nucleation site of austenite to ferritic transformation.The high temperature seam effect that simultaneously rolling produces eliminates the defects such as loose, the tiny crack of continuously cast bloom inside to a great extent, and the density of steel plate is improved.After austenite recrystallization controlled rolling terminates, intermediate blank swings cooling on roller-way, and cooling method is natural air cooling, and the start rolling temperature being cooled to subordinate phase rolling starts subordinate phase rolling.Subordinate phase rolling belongs to non-Controlled Cooling, and by the Carbonitride Precipitation of Nb, pinning dislocation, intra-die produces strain under rolling deformation.By multi-pass rolling, intra-die have accumulated a large amount of deformation energies and phase transformation nucleation site.
Step S3: cooling
Cooling adopts section cooling, and speed of cooling is 8 ~ 25 DEG C/s, and final cooling temperature is 590 ~ 630 DEG C.
The present invention, by the quick cooling after rolling and lower final cooling temperature, obtains based on tiny ferrite, containing a small amount of pearlitic high tenacity tissue.Metallographic structure of the present invention is based on ferrite.For ferrite and pearlite tissue, ferritic ratio is larger, its crystal grain is more tiny, then toughness is better.
Mass percentage through the chemical composition of the material of the ductility steel plate of the yield strength 460MPa level obtained of above-mentioned explained hereafter is: C0.05 ~ 0.08%, Si0.2 ~ 0.4%, Mn1.2 ~ 1.6%, P≤0.02%, S≤0.01%, Nb0.04 ~ 0.06%, V0.04 ~ 0.07%, Ti0.006 ~ 0.012%, Ca0.0015 ~ 0.003%, Als0.017 ~ 0.027%, and all the other are iron and impurity.Yield strength 460MPa grade high ductility steel plate of the present invention adopts low-carbon (LC) Composition Design.Ratio of ferrite and carbon content are inverse relation, and carbon content is lower, then ferrite proportion is larger.Steel plate carbon content involved in the present invention is lower, and by adopting suitable controlled rolling and cooling control technology, ferrite crystal grain is tiny, so steel plate involved in the present invention has good toughness.The toughness of steel plate is better, and welding property is better.Therefore from Composition Design, ensure that excellent toughness and the welding property of steel plate.
Embodiment 1
The thickness of the continuously cast bloom that embodiment 1 is selected is 253mm.
In continuously cast bloom heat-processed, the tapping temperature of continuously cast bloom is 1193 DEG C, and heat-up time is 313 minutes.The mass percentage of the chemical composition of continuously cast bloom comprises: C0.074%, Si0.24%, Mn1.5%, P0.007%, S≤0.005%, Nb0.052%, V0.058%, Ti0.012%, Ca0.0027%, Als0.023%, and surplus is Fe and inevitable impurity.
Then the slab after heating is carried out first stage rolling and subordinate phase rolling, after two sections of rolling process terminate, obtain the steel plate that thickness is 30mm.Again this steel plate is cooled.
Rolling and the content influence of refrigerating work procedure to the chemical composition of the material of steel plate little, therefore, the mass percentage of the chemical composition of the material of the steel plate of the embodiment 1 obtained of producing comprises: C0.074%, Si0.24%, Mn1.5%, P0.007%, S0.005%, Nb0.052%, V0.058%, Ti0.012%, Ca0.0027%, Als0.023%, surplus is Fe and inevitable impurity.
Detailed rolling and the processing parameter of cooling are in table 1.Produce the mechanical property of the steel plate of the embodiment 1 obtained in table 2.
As shown in Figure 1, be the metallographic structure figure of the steel plate of embodiments of the invention 1.As can be seen from Figure 1, the metallographic structure of steel plate is mainly ferrite, and has a small amount of perlite and bainite, the crystal grain of steel plate is tiny and evenly, the mean sizes of crystal grain is at about 10 μm, and content of pearlite in alloy is little, therefore the satisfactory mechanical property of steel plate, especially low-temperature flexibility is good.
Embodiment 2
The thickness of the continuously cast bloom that embodiment 2 is selected is 253mm.
In continuously cast bloom heat-processed, the tapping temperature of continuously cast bloom is 1220 DEG C, and heat-up time is 326 minutes.The mass percentage of the chemical composition of continuously cast bloom comprises: C0.074%, Si0.24%, Mn1.5%, P0.007%, S0.005%, Nb0.052%, V0.058%, Ti0.012%, Ca0.0027%, Als0.024%, and surplus is Fe and inevitable impurity.
Then the slab after heating is carried out first stage rolling and subordinate phase rolling, after two sections of rolling process terminate, obtain the steel plate that thickness is 30mm.Again this steel plate is cooled.
Rolling and the content influence of refrigerating work procedure to the chemical composition of the material of steel plate little, therefore, the mass percentage of the chemical composition of the material of the steel plate of the embodiment 2 obtained of producing comprises: C0.074%, Si0.24%, Mn1.5%, P0.007%, S0.005%, Nb0.052%, V0.058%, Ti0.012%, Ca0.0027%, Als0.024%, surplus is Fe and inevitable impurity.
Detailed rolling and the processing parameter of cooling are in table 1.Produce the mechanical property of the steel plate of the embodiment 2 obtained in table 2.
As shown in Figure 2, be the metallographic structure figure of the steel plate of embodiments of the invention 2.As can be seen from Figure 2, the metallographic structure of steel plate is mainly ferrite, and has a small amount of perlite and bainite, the crystal grain of steel plate is tiny and evenly, the mean sizes of crystal grain is at about 10 μm, and content of pearlite in alloy is little, therefore the satisfactory mechanical property of steel plate, especially low-temperature flexibility is good.
Embodiment 3
The thickness of the continuously cast bloom that embodiment 3 is selected is 250mm.
In continuously cast bloom heat-processed, the tapping temperature of continuously cast bloom is 1180 DEG C, and heat-up time is 275 minutes.The mass percentage of the chemical composition of continuously cast bloom comprises: C0.05%, Si0.25%, Mn1.6%, P0.011%, S0.01%, Nb0.06%, V0.04%, Ti0.01%, Ca0.0018%, Als0.017%, and surplus is Fe and inevitable impurity.
Then the slab after heating is carried out first stage rolling and subordinate phase rolling, after two sections of rolling process terminate, obtain the steel plate that thickness is 25mm.Again this steel plate is cooled.
Rolling and the content influence of refrigerating work procedure to the chemical composition of the material of steel plate little, therefore, the mass percentage of the chemical composition of the material of the steel plate of the embodiment 3 obtained of producing comprises: C0.05%, Si0.25%, Mn1.6%, P0.011%, S0.01%, Nb0.06%, V0.04%, Ti0.01%, Ca0.0018%, Als0.017%, surplus is Fe and inevitable impurity.
Detailed rolling and the processing parameter of cooling are in table 1.Produce the mechanical property of the steel plate of the embodiment 3 obtained in table 2.
As shown in Figure 3, be the metallographic structure figure of the steel plate of embodiments of the invention 3.As can be seen from Figure 3, the metallographic structure of steel plate is mainly ferrite, and has a small amount of perlite and bainite, the crystal grain of steel plate is tiny and evenly, the mean sizes of crystal grain is at about 10 μm, and content of pearlite in alloy is little, therefore the satisfactory mechanical property of steel plate, especially low-temperature flexibility is good.
Embodiment 4
The thickness of the continuously cast bloom that embodiment 4 is selected is 250mm.
In continuously cast bloom heat-processed, the tapping temperature of continuously cast bloom is 1218 DEG C, and heat-up time is 250 minutes.The mass percentage of the chemical composition of continuously cast bloom comprises: C0.08%, Si0.2%, Mn1.5%, P0.02%, S0.004%, Nb0.04%, V0.06%, Ti0.008%, Ca0.003%, Als0.025%, and surplus is Fe and inevitable impurity.
Then the slab after heating is carried out first stage rolling and subordinate phase rolling, after two sections of rolling process terminate, obtain the steel plate that thickness is 20mm.Again this steel plate is cooled.
Rolling and the content influence of refrigerating work procedure to the chemical composition of the material of steel plate little, therefore, the mass percentage of the chemical composition of the material of the steel plate of the embodiment 4 obtained of producing comprises: C0.08%, Si0.2%, Mn1.5%, P0.02%, S0.004%, Nb0.04%, V0.06%, Ti0.008%, Ca0.003%, Als0.025%, surplus is Fe and inevitable impurity.
Detailed rolling and the processing parameter of cooling are in table 1.Produce the mechanical property of the steel plate of the embodiment 4 obtained in table 2.
As shown in Figure 4, be the metallographic structure figure of the steel plate of embodiments of the invention 4.As can be seen from Figure 4, the metallographic structure of steel plate is mainly ferrite, and has a small amount of perlite and bainite, the crystal grain of steel plate is tiny and evenly, the mean sizes of crystal grain is at about 10 μm, and content of pearlite in alloy is little, therefore the satisfactory mechanical property of steel plate, especially low-temperature flexibility is good.
Embodiment 5
The thickness of the continuously cast bloom that embodiment 5 is selected is 250mm.
In continuously cast bloom heat-processed, the tapping temperature of continuously cast bloom is 1230 DEG C, and heat-up time is 440 minutes.The mass percentage of the chemical composition of continuously cast bloom comprises: C0.07%, Si0.4%, Mn1.2%, P0.009%, S0.005%, Nb0.045%, V0.07%, Ti0.006%, Ca0.0015%, Als0.027%, and surplus is Fe and inevitable impurity.
Then the slab after heating is carried out first stage rolling and subordinate phase rolling, after two sections of rolling process terminate, obtain the steel plate that thickness is 25mm.Again this steel plate is cooled.
Rolling and the content influence of refrigerating work procedure to the chemical composition of the material of steel plate little, therefore, the mass percentage of the chemical composition of the material of the steel plate of the embodiment 5 obtained of producing comprises: C0.07%, Si0.4%, Mn1.2%, P0.009%, S0.005%, Nb0.045%, V0.07%, Ti0.006%, Ca0.0015%, Als0.027%, surplus is Fe and inevitable impurity.
As shown in Figure 5, be the metallographic structure figure of the steel plate of embodiments of the invention 5.As can be seen from Figure 5, the metallographic structure of steel plate is mainly ferrite, and has a small amount of perlite and bainite, the crystal grain of steel plate is tiny and evenly, the mean sizes of crystal grain is at about 10 μm, and content of pearlite in alloy is little, therefore the satisfactory mechanical property of steel plate, especially low-temperature flexibility is good.
The processing parameter of detailed continuously cast bloom heating, rolling and cooling is in table 1.Produce the mechanical property of the steel plate of the embodiment 5 obtained in table 2.
The rolling of table 1 various embodiments of the present invention and the processing parameter of cooling
The mechanical experimental results of table 2 various embodiments of the present invention
Method of the present invention adopts low-carbon (LC) Composition Design, and controlled rolling and cooling control technology are produced.Control the parameters such as tapping temperature, subordinate phase start rolling temperature, open rolling thickness, subordinate phase finishing temperature and final cooling temperature well, the steel plate of excellent property can be produced, steel plate yield strength between 510 ~ 525MPa, tensile strength between 575 ~ 585MPa, unit elongation >=25%.The ballistic work of-40 DEG C is at more than 236J, and low-temperature impact toughness is good.
The present invention produced 5000 tons of steel plates with 1 year and calculates, and steel plate per ton is got a profit 400 yuan and calculated, and can increase economic benefit 2,000,000 yuan.
Claims (2)
1. a production method for the ductility steel plate of yield strength 460MPa level, is characterized in that, comprising: continuously cast bloom heating, rolling and cooling, and the tapping temperature of described continuously cast bloom heating is 1180-1230 DEG C, and heat-up time is 250 ~ 440 minutes; Described rolling comprises first stage rolling and subordinate phase rolling, and during described first stage rolling open rolling, the thickness of slab is the thickness of described continuously cast bloom; The start rolling temperature of described first stage rolling is 1175 ~ 1225 DEG C, finishing temperature >=980 DEG C of described first stage rolling, and the rolling pass number of described first stage rolling is 5 ~ 10, and roll speed is not more than 2.0m/s, has at least twice draft to be greater than 15%; During described subordinate phase rolling open rolling, the thickness of slab is the 2-3.5 doubly thickness of the ductility steel plate of yield strength 460MPa level that obtains of described production, the start rolling temperature of described subordinate phase rolling is 890 ~ 960 DEG C, the finishing temperature of described subordinate phase rolling is 840 ~ 890 DEG C, and the rolling pass number of described subordinate phase rolling is 5 ~ 7; Describedly be cooled to section cooling, speed of cooling is 8 ~ 25 DEG C/s, and final cooling temperature is 590 ~ 630 DEG C; The mass percentage producing the material of the ductility steel plate of the yield strength 460MPa level obtained comprises: C0.05 ~ 0.08%, Si0.2 ~ 0.4%, Mn1.2 ~ 1.6%, P≤0.02%, S≤0.01%, Nb0.04 ~ 0.06%, V0.04 ~ 0.07%, Ti0.006 ~ 0.012%, Ca0.0015 ~ 0.003%, Als0.017 ~ 0.027%, all the other are iron and impurity.
2. the production method of the ductility steel plate of yield strength 460MPa level as claimed in claim 1, it is characterized in that, the mass percentage producing the material of the ductility steel plate of the yield strength 460MPa level obtained comprises: C0.074%, Si0.24%, Mn1.5%, P0.007%, S0.005%, Nb0.052%, V0.058%%, Ti0.012%, Ca0.0027%, Als0.023%; Or, C0.074%, Si0.24%, Mn1.5%, P0.007%, S0.005%, Nb0.052%, V0.058%, Ti0.012%, Ca0.0027%, Als0.024%; Or, C0.05%, Si0.25%, Mn1.6%, P0.011%, S0.01%, Nb0.06%, V0.04%, Ti0.01%, Ca0.0018%, Als0.017%; Or, C0.08%, Si0.2%, Mn1.5%, P0.02%, S0.004%, Nb0.04%, V0.06%, Ti0.008%, Ca0.003%, Als0.025%; Or, C0.07%, Si0.4%, Mn1.2%, P0.009%, S0.005%, Nb0.045%, V0.07%, Ti0.006%, Ca0.0015%, Als0.027%.
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| CN106637208A (en) * | 2016-09-23 | 2017-05-10 | 广东康业电器有限公司 | Production process for A3 steel plate enamel piece |
| CN106987773B (en) * | 2017-05-05 | 2019-02-12 | 内蒙古包钢钢联股份有限公司 | A kind of high strength steel plate and its board-shape control method |
| CN112251569A (en) * | 2020-09-11 | 2021-01-22 | 南京钢铁股份有限公司 | Method for improving yield strength of Q460 grade high-strength steel plate |
| CN116043105B (en) * | 2022-11-07 | 2024-04-12 | 内蒙古工业大学 | Corrosion-resistant ultra-high-strength steel for ocean platform and preparation method thereof |
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