CN109811256A - A kind of low yield strength ratio high-strength steel sheet and its production method - Google Patents
A kind of low yield strength ratio high-strength steel sheet and its production method Download PDFInfo
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Abstract
The invention discloses a kind of low yield strength ratio high-strength steel sheet and its production methods, the steel plate chemical component composition and its mass percentage are as follows: C:0.05~0.08%, Si:0.15~0.35%, Mn:1.40~1.55%, P≤0.015%, S≤0.010%, Al:0.020~0.035%, Cr:0.10~0.15%, Mo:0.12~0.20%, V:0.020~0.030%, Nb:0.020~0.030%, surplus are Fe and inevitable impurity；The production method includes heating steel billet, controlled rolling, roller repairing, aligning process.The present invention is designed using low-carbon, low-alloy ingredient, is reentered water by relaxation certain time after control steel plate rolling and is cooled down, gained steel plate fully meets standard and safety requirements, is suitable for the manufacture of water power structural member, the storage of chemical products and transporting equipment.
Description
Technical field
The invention belongs to rolling technical fields, and in particular to a kind of low yield strength ratio high-strength steel sheet and its production method.
Background technique
With the rapid development of the national economy, the safety to equipment proposes increasingly higher demands, for steel,
Lower yield tensile ratio means that steel plate has biggish ability to bear when by external force, can not occurrence of equipment deformation or cracking,
To improve the safety of equipment.But for high strength steel, because its intensity is higher, to obtain lower yield tensile ratio production
It is difficult.
Steel plate has lower yield tensile ratio, to such as skyscraper while higher-strength, favorable low-temperature impact toughness
Anti-seismic performance, the resistance to deformation damage capability of structure and equipment has a very important significance.It is generally believed that steel plate tissue is thin
Change the comprehensive performance for being conducive to steel plate, still, excessively pursuit structure refinement is unfavorable to the yield tensile ratio for reducing steel plate, and main cause is
Structure refinement significantly improves the yield strength of steel, tensile strength under the same conditions, greatly improve the yield tensile ratio of steel.In reality
In the production of border, how while proof strength and toughness yield tensile ratio is reduced, be always the problem of steel plate controlled rolling.
For yield strength >=490MPa steel plate, yield tensile ratio is difficult to control lower water usually 0.90% or more
It is flat, controlled rolling and Controlled cooling process of the present invention by research steel plate, and to after steel plate rolling cooling opportunity and cooling
Condition is controlled, and solves the problem, has obtained the steel plate compared with low yield strength ratio.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of low yield strength ratio high-strength steel sheet and its production methods.The invention
Using low-carbon C:0.05~0.08%, alloy element Cr:0.10~0.15%, Mo:0.12~0.20%, V:0.020~
0.030%, the ingredient design of Nb:0.020~0.030% reenters water by relaxation after control steel plate rolling after a certain period of time and carries out
It is cooling, while reducing cost of alloy, acquisition high intensity, low yield strength ratio, favorable low-temperature impact toughness comprehensive mechanical property,
And there is excellent welding performance, the demand in the development of the national economy and market is met, there is considerable economic benefit and society
Benefit.
In order to solve the above technical problems, the technical scheme adopted by the invention is that: a kind of low yield strength ratio high-strength steel sheet, institute
State steel plate chemical component composition and its mass percentage are as follows: C:0.05~0.08%, Si:0.15~0.35%, Mn:1.40~
1.55%, P≤0.015%, S≤0.010%, Al:0.020~0.035%, Cr:0.10~0.15%, Mo:0.12~0.20%, V:
0.020~0.030%, Nb:0.020~0.030%, surplus are Fe and inevitable impurity.
Steel plate of the present invention with a thickness of 20~40mm.
Steel plate group of the present invention is woven to bainite+ferrite, grain size >=7.5 grade.
Steel plate yield strength >=490MPa of the present invention, 620~680MPa of tensile strength, yield tensile ratio≤0.87% extend
Rate >=17%, -20 DEG C of side knock function >=100J；Steel plate unevenness≤4mm/m.
The present invention also provides a kind of production method of low yield strength ratio high-strength steel sheet, the production method includes that steel billet adds
Heat, controlled rolling, roller repairing, aligning process；The roller repairing process, steel plate rolling finish 20~30s of relaxation, then enter
Water.
Heating steel billet process of the present invention, steel billet maximum heating temperature≤1260 DEG C, 1230~1250 DEG C of soaking temperature,
Heating time >=10min/cm, wherein soaking time >=50min；The steel billet is with a thickness of 200~250mm.
Controlled rolling process of the present invention, using two-phase control rolling technique, I stage start rolling temperature is 1050~1100
℃；II stage start rolling temperature is 850~870 DEG C, and finishing temperature is 810~830 DEG C.
Roller repairing process of the present invention, water cooling is to 500~600 DEG C.
Aligning process of the present invention enters 2~4 passage of straightener leveling after steel plate is cooling, to obtain good template.
Mentality of designing of the present invention:
For yield strength >=490MPa steel plate, yield tensile ratio is difficult to control reduced levels usually 0.90% or more,
The present invention controls the yield tensile ratio extremely≤0.87% of steel plate.Its main method is that controlled rolling II stage start rolling temperature is 850~870
DEG C, II stage finishing temperature is 810~830 DEG C, rolls 20~30s(of rear steel plate relaxation waiting), then enter back into rapid cooling dress
It sets, water cooling is to 500~600 DEG C.By 20~30s of relaxation, a certain amount of pro-eutectoid ferrite is generated, the surrender for reducing steel is strong
Degree, thus tensile strength under the same conditions, reduce the yield tensile ratio of steel.
Low yield strength ratio high-strength steel sheet product standard of the present invention refers to GB19189-2011 " the quenched high intensity of pressure vessel
Steel plate "；Properties of product detection method canonical reference GB/T228.1-2010 " metal material stretching test part 1: room temperature examination
Proved recipe method ", GB/T 229-2007 " metal material Charpy pendulum impact test method "；Ultrasonic examination canonical reference NB/
T47013.3-2015 " bearing device non-destructive testing third portion ultrasound detection ".
The beneficial effects of adopting the technical scheme are that the 1, present invention uses low-carbon C:0.05~0.08%, close
Alloying element Cr:0.10~0.15%, Mo:0.12~0.20%, V:0.020~0.030%, Nb:0.020~0.030% ingredient
Design reenters water by relaxation after control steel plate rolling after a certain period of time and is cooled down, while reducing cost of alloy, obtained
High intensity, low yield strength ratio, favorable low-temperature impact toughness comprehensive mechanical property, and have excellent welding performance.2, of the invention
Cost of alloy and production cost are reduced, gained steel plate has the characteristics that high intensity, low yield strength ratio, high tenacity, good welds,
Standard and safety requirements are fully met, the manufacture of water power structural member, the storage of chemical products and transporting equipment etc. is suitable for, is met
The demand of the development of the national economy and market.
Specific embodiment
The present invention will be further described in detail below with reference to specific embodiments.
Embodiment 1
The present embodiment low yield strength ratio high-strength steel sheet is with a thickness of 20mm, chemical component composition and mass percentage are as follows: C:
0.05%, Si:0.25%, Mn:1.50%, P:0.015%, S:0.005%, Al:0.035%, Cr:0.10%, Mo:0.15%, V:
0.025%, Nb:0.030%, surplus are Fe and inevitable impurity.
The production method of the present embodiment low yield strength ratio high-strength steel sheet includes heating steel billet, controlled rolling, roller repairing, rectifys
Straight process, specific process step are as described below:
(1) heating steel billet process: 1250 DEG C of maximum heating temperature of steel billet (with a thickness of 200mm), 1240 DEG C of soaking temperature, when heating
Between 10min/cm, wherein soaking time 60min；
(2) controlled rolling process: two-phase control rolling technique is used；I stage start rolling temperature is 1080 DEG C；II stage start rolling temperature is
860 DEG C, finishing temperature is 820 DEG C；
(3) roller repairing process: rolling finishes relaxation 25s, then enters water, water cooling is to 550 DEG C；
(4) it aligns process: entering 3 passage of straightener leveling after steel plate is cooling.
The metallographic structure of low yield strength ratio high-strength steel sheet obtained by the present embodiment is bainite+ferrite, and ultrasonic examination is full
I grades of sufficient NB/T47013.3-2015 standard requirements；Grain size, unevenness, thickness deviation and the mechanical performance index of steel plate are shown in Table
1。
Embodiment 2
The present embodiment low yield strength ratio high-strength steel sheet is with a thickness of 30mm, chemical component composition and mass percentage are as follows: C:
0.06%, Si:0.15%, Mn:1.45%, P:0.009%, S:0.010%, Al:0.030%, Cr:0.15%, Mo:0.12%, V:
0.030%, Nb:0.029%, surplus are Fe and inevitable impurity.
The production method of the present embodiment low yield strength ratio high-strength steel sheet includes heating steel billet, controlled rolling, roller repairing, rectifys
Straight process, specific process step are as described below:
(1) heating steel billet process: 1260 DEG C of maximum heating temperature of steel billet (with a thickness of 200mm), 1230 DEG C of soaking temperature, when heating
Between 10min/cm, wherein soaking time 50min；
(2) controlled rolling process: two-phase control rolling technique is used；I stage start rolling temperature is 1100 DEG C；II stage start rolling temperature is
870 DEG C, finishing temperature is 830 DEG C；
(3) roller repairing process: rolling finishes relaxation 30s, then enters water, water cooling is to 600 DEG C；
(4) it aligns process: entering 2 passage of straightener leveling after steel plate is cooling.
The metallographic structure of low yield strength ratio high-strength steel sheet obtained by the present embodiment is bainite+ferrite, and ultrasonic examination is full
I grades of sufficient NB/T47013.3-2015 standard requirements；Grain size, unevenness, thickness deviation and the mechanical performance index of steel plate are shown in Table
1。
Embodiment 3
The present embodiment low yield strength ratio high-strength steel sheet is with a thickness of 40mm, chemical component composition and mass percentage are as follows: C:
0.07%, Si:0.20%, Mn:1.43%, P:0.008%, S:0.004%, Al:0.025%, Cr:0.11%, Mo:0.19%, V:
0.020%, Nb:0.028%, surplus are Fe and inevitable impurity.
The production method of the present embodiment low yield strength ratio high-strength steel sheet includes heating steel billet, controlled rolling, roller repairing, rectifys
Straight process, specific process step are as described below:
(1) heating steel billet process: 1255 DEG C of maximum heating temperature of steel billet (with a thickness of 250mm), 1245 DEG C of soaking temperature, when heating
Between 11min/cm, wherein soaking time 60min；
(2) controlled rolling process: two-phase control rolling technique is used；I stage start rolling temperature is 1090 DEG C；II stage start rolling temperature is
860 DEG C, finishing temperature is 826 DEG C；
(3) roller repairing process: rolling finishes relaxation 26s, then enters water, water cooling is to 530 DEG C；
(4) it aligns process: entering 4 passage of straightener leveling after steel plate is cooling.
The metallographic structure of low yield strength ratio high-strength steel sheet obtained by the present embodiment is bainite+ferrite, and ultrasonic examination is full
I grades of sufficient NB/T47013.3-2015 standard requirements；Grain size, unevenness, thickness deviation and the mechanical performance index of steel plate are shown in Table
1。
Embodiment 4
The present embodiment low yield strength ratio high-strength steel sheet is with a thickness of 35mm, chemical component composition and mass percentage are as follows: C:
0.08%, Si:0.35%, Mn:1.40%, P:0.010%, S:0.008%, Al:0.020%, Cr:0.12%, Mo:0.13%, V:
0.030%, Nb:0.020%, surplus are Fe and inevitable impurity.
The production method of the present embodiment low yield strength ratio high-strength steel sheet includes heating steel billet, controlled rolling, roller repairing, rectifys
Straight process, specific process step are as described below:
(1) heating steel billet process: 1240 DEG C of maximum heating temperature of steel billet (with a thickness of 250mm), 1230 DEG C of soaking temperature, when heating
Between 10min/cm, wherein soaking time 55min；
(2) controlled rolling process: two-phase control rolling technique is used；I stage start rolling temperature is 1050 DEG C；II stage start rolling temperature is
850 DEG C, finishing temperature is 810 DEG C；
(3) roller repairing process: rolling finishes relaxation 20s, then enters water, water cooling is to 500 DEG C；
(4) it aligns process: entering 4 passage of straightener leveling after steel plate is cooling.
The metallographic structure of low yield strength ratio high-strength steel sheet obtained by the present embodiment is bainite+ferrite, and ultrasonic examination is full
I grades of sufficient NB/T47013.3-2015 standard requirements；Grain size, unevenness, thickness deviation and the mechanical performance index of steel plate are shown in Table
1。
Embodiment 5
The present embodiment low yield strength ratio high-strength steel sheet is with a thickness of 35mm, chemical component composition and mass percentage are as follows: C:
0.07%, Si:0.31%, Mn:1.55%, P:0.012%, S:0.005%, Al:0.027%, Cr:0.13%, Mo:0.16%, V:
0.022%, Nb:0.022%, surplus are Fe and inevitable impurity.
The production method of the present embodiment low yield strength ratio high-strength steel sheet includes heating steel billet, controlled rolling, roller repairing, rectifys
Straight process, specific process step are as described below:
(1) heating steel billet process: 1260 DEG C of maximum heating temperature of steel billet (with a thickness of 250mm), 1250 DEG C of soaking temperature, when heating
Between 11min/cm, wherein soaking time 70min；
(2) controlled rolling process: two-phase control rolling technique is used；I stage start rolling temperature is 1100 DEG C；II stage start rolling temperature is
865 DEG C, finishing temperature is 828 DEG C；
(3) roller repairing process: rolling finishes relaxation 30s, then enters water, water cooling is to 580 DEG C；
(4) it aligns process: entering 2 passage of straightener leveling after steel plate is cooling.
The metallographic structure of low yield strength ratio high-strength steel sheet obtained by the present embodiment is bainite+ferrite, and ultrasonic examination is full
I grades of sufficient NB/T47013.3-2015 standard requirements；Grain size, unevenness, thickness deviation and the mechanical performance index of steel plate are shown in Table
1。
Embodiment 6
The present embodiment low yield strength ratio high-strength steel sheet is with a thickness of 25mm, chemical component composition and mass percentage are as follows: C:
0.056%, Si:0.19%, Mn:1.48%, P:0.007%, S:0.006%, Al:0.033%, Cr:0.14%, Mo:0.15%, V:
0.027%, Nb:0.026%, surplus are Fe and inevitable impurity.
The production method of the present embodiment low yield strength ratio high-strength steel sheet includes heating steel billet, controlled rolling, roller repairing, rectifys
Straight process, specific process step are as described below:
(1) heating steel billet process: 1245 DEG C of maximum heating temperature of steel billet (with a thickness of 200mm), 1235 DEG C of soaking temperature, when heating
Between 10.5min/cm, wherein soaking time 65min；
(2) controlled rolling process: two-phase control rolling technique is used；I stage start rolling temperature is 1060 DEG C；II stage start rolling temperature is
854 DEG C, finishing temperature is 817 DEG C；
(3) roller repairing process: rolling finishes relaxation 22s, then enters water, water cooling is to 525 DEG C；
(4) it aligns process: entering 4 passage of straightener leveling after steel plate is cooling.
The metallographic structure of low yield strength ratio high-strength steel sheet obtained by the present embodiment is bainite+ferrite, and ultrasonic examination is full
I grades of sufficient NB/T47013.3-2015 standard requirements；Grain size, unevenness, thickness deviation and the mechanical performance index of steel plate are shown in Table
1。
Embodiment 7
The present embodiment low yield strength ratio high-strength steel sheet is with a thickness of 32mm, chemical component composition and mass percentage are as follows: C:
0.072%, Si:0.29%, Mn:1.51%, P:0.009%, S:0.004%, Al:0.022%, Cr:0.15%, Mo:0.20%, V:
0.025%, Nb:0.028%, surplus are Fe and inevitable impurity.
The production method of the present embodiment low yield strength ratio high-strength steel sheet includes heating steel billet, controlled rolling, roller repairing, rectifys
Straight process, specific process step are as described below:
(1) heating steel billet process: 1253 DEG C of maximum heating temperature of steel billet (with a thickness of 200mm), 1242 DEG C of soaking temperature, when heating
Between 12min/cm, wherein soaking time 75min；
(2) controlled rolling process: two-phase control rolling technique is used；I stage start rolling temperature is 1070 DEG C；II stage start rolling temperature is
862 DEG C, finishing temperature is 824 DEG C；
(3) roller repairing process: rolling finishes relaxation 26s, then enters water, water cooling is to 575 DEG C；
(4) it aligns process: entering 2 passage of straightener leveling after steel plate is cooling.
The metallographic structure of low yield strength ratio high-strength steel sheet obtained by the present embodiment is bainite+ferrite, and ultrasonic examination is full
I grades of sufficient NB/T47013.3-2015 standard requirements；Grain size, unevenness, thickness deviation and the mechanical performance index of steel plate are shown in Table
1。
Embodiment 8
The present embodiment low yield strength ratio high-strength steel sheet is with a thickness of 28mm, chemical component composition and mass percentage are as follows: C:
0.067%, Si:0.33%, Mn:1.47%, P:0.006%, S:0.003%, Al:0.031%, Cr:0.13%, Mo:0.12%, V:
0.030%, Nb:0.020%, surplus are Fe and inevitable impurity.
The production method of the present embodiment low yield strength ratio high-strength steel sheet includes heating steel billet, controlled rolling, roller repairing, rectifys
Straight process, specific process step are as described below:
(1) heating steel billet process: 1257 DEG C of maximum heating temperature of steel billet (with a thickness of 200mm), 1248 DEG C of soaking temperature, when heating
Between 11.5min/cm, wherein soaking time 80min；
(2) controlled rolling process: two-phase control rolling technique is used；I stage start rolling temperature is 1085 DEG C；II stage start rolling temperature is
865 DEG C, finishing temperature is 825 DEG C；
(3) roller repairing process: rolling finishes relaxation 28s, then enters water, water cooling is to 535 DEG C；
(4) it aligns process: entering 3 passage of straightener leveling after steel plate is cooling.
The metallographic structure of low yield strength ratio high-strength steel sheet obtained by the present embodiment is bainite+ferrite, and ultrasonic examination is full
I grades of sufficient NB/T47013.3-2015 standard requirements；Grain size, unevenness, thickness deviation and the mechanical performance index of steel plate are shown in Table
1。
1 embodiment 1-8 steel plate grain size of table, unevenness, thickness deviation and mechanical performance index
Above-described embodiment shows low yield strength ratio high-strength steel sheet simple production process of the present invention, and production cost is low, gained steel plate
Alloy content is low, has the characteristics that high intensity, low yield strength ratio, high tenacity, good welds, fully meets standard and safety is wanted
It asks, it can be achieved that producing in batches.
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although referring to above-described embodiment to this hair
It is bright to be described in detail, those skilled in the art should understand that: still the present invention can be modified or be waited
With replacement, without departing from the spirit or scope of the invention, or any substitutions, should all cover in power of the invention
In sharp claimed range.
Claims (9)
1. a kind of low yield strength ratio high-strength steel sheet, which is characterized in that the steel plate chemical component composition and its mass percentage
Are as follows: C:0.05~0.08%, Si:0.15~0.35%, Mn:1.40~1.55%, P≤0.015%, S≤0.010%, Al:0.020~
0.035%, Cr:0.10~0.15%, Mo:0.12~0.20%, V:0.020~0.030%, Nb:0.020~0.030%, surplus are
Fe and inevitable impurity.
2. a kind of low yield strength ratio high-strength steel sheet according to claim 1, which is characterized in that the steel plate with a thickness of 20
~40mm, thickness deviation are 0~+0.5mm.
3. a kind of low yield strength ratio high-strength steel sheet according to claim 1, which is characterized in that the steel plate group is woven to bayesian
Body+ferrite, grain size >=7.5 grade.
4. a kind of low yield strength ratio high-strength steel sheet according to claim 1, which is characterized in that the steel plate yield strength >=
490MPa, 620~680MPa of tensile strength, yield tensile ratio≤0.87%, elongation percentage >=17%, -20 DEG C of side knock function >=100J；Steel
Plate unevenness≤4mm/m.
5. based on a kind of production method of low yield strength ratio high-strength steel sheet described in claim 1-4 any one, feature exists
In the production method includes heating steel billet, controlled rolling, roller repairing, aligning process；The roller repairing process, steel plate
Rolling finishes 20~30s of relaxation, then enters water.
6. a kind of production method of low yield strength ratio high-strength steel sheet according to claim 5, which is characterized in that the steel billet
Heating process, steel billet maximum heating temperature≤1260 DEG C, 1230~1250 DEG C of soaking temperature, heating time >=10min/cm,
Middle soaking time >=50min；The steel billet is with a thickness of 200~250mm.
7. a kind of production method of low yield strength ratio high-strength steel sheet according to claim 5, which is characterized in that the control
Rolling process, using two-phase control rolling technique, I stage start rolling temperature is 1050~1100 DEG C；II stage start rolling temperature be 850~
870 DEG C, finishing temperature is 810~830 DEG C.
8. a kind of production method of low yield strength ratio high-strength steel sheet, feature according to claim 5-7 any one exist
In the roller repairing process, water cooling is to 500~600 DEG C.
9. a kind of production method of low yield strength ratio high-strength steel sheet, feature according to claim 5-7 any one exist
In the aligning process enters 2~4 passage of straightener leveling after steel plate is cooling.
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| CN115927953A (en) * | 2022-10-31 | 2023-04-07 | 南阳汉冶特钢有限公司 | Steel 07MnMoVR for petroleum storage tank and production method thereof |
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