CN109355549A - A kind of steel plate and its manufacturing method with high intensity and excellent low temperature toughness - Google Patents
A kind of steel plate and its manufacturing method with high intensity and excellent low temperature toughness Download PDFInfo
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- CN109355549A CN109355549A CN201811509282.2A CN201811509282A CN109355549A CN 109355549 A CN109355549 A CN 109355549A CN 201811509282 A CN201811509282 A CN 201811509282A CN 109355549 A CN109355549 A CN 109355549A
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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Abstract
The invention belongs to steel manufacturing fields, are related to a kind of with high-intensitive and excellent low temperature toughness steel plate and its manufacturing method.Warm deformation is carried out in ferrite+austenite two-phase section, rear Direct Air-Cooled is rolled to room temperature, does not need control cooling.The tissue signature of steel plate is that have the ultrafine-grained (UFG) microstructure elongated on through thickness direction, and crystallite dimension has stronger α and gamma fiber texture less than 3 μm.Thick steel plate chemical component of the invention is straight carbon steel or micro alloyed steel, its chemical component includes: C:0.03~0.30%, Si:0.10~0.50%, Mn:1.0~2.0%, P < 0.10%, S < 0.10%, Al < 0.10%, Nb:0~0.10%, V:0~0.10%, Ti:0~0.05%, N:0.0020~0.010%, Mo:0~0.5%, Cr:0~1.0%, Ni:0~1.0%, surplus Fe.Under such component system, the steel plate of exploitation, yield strength is greater than 500MPa, and ductile-brittle transition temperature is lower than -120 DEG C, and elongation is greater than 25%.Such steel plate can be applied to obdurability requirement height, especially to the demanding field of low-temperature flexibility.
Description
Technical field
The present invention relates to a kind of steel plate of high-intensity and high-tenacity and its manufacturing method, especially yield strengths to be greater than
500MPa, ductile-brittle transition temperature are lower than -120 DEG C, and elongation has high-intensitive and excellent low temperature toughness steel plate greater than 25%
And its manufacturing method.
Background technique
In order to reduce the weight with guarantee safety, it is desirable that steel have high intensity and high toughness.In order to reduce resource and energy
The consumption in source, manufacturing industry propose the concept of " green manufacturing ".Require not add or add alloying element amount less to produce
Need the steel of performance.
The method of common production high-strength high-toughness steel plate is cooling controlling and rolling controlling process, i.e., controls after two stages controlled rolling+roll
It is cooling, and usually heating temperature is at 1200 DEG C or so.For 500MPa grades or more of high-strength steel, tissue substantially with bainite or
Based on acicular ferrite.In order to generate the tissue of this type, while guaranteeing high toughness, need to add a certain amount of Cr, Mo or
The noble elements such as Ni carry out modulation treatment after rolling.
CN101705439 discloses a kind of method for developing the F460 grades of high-strength decks of boat of high/low temperature toughness.Addition 0.10%~
0.30%Cr and 0.15~0.40%Ni.In technique, heating temperature keeps the temperature 2~3 hours within the scope of 1180~1250 DEG C.
Cooling is controlled after rolling, it is desirable that cooling velocity is within the scope of 7~10 DEG C/s, and final cooling temperature is within the scope of 450~500 DEG C.
CN101948987 discloses a kind of manufacturing method of high strength steel plate.In addition to the basic ingredients such as C, Si and Mn, add
Add a certain amount of Cr and B, to increase harden ability.Using controlled rolling and controlled cooling+quenching+high tempering process route.Heating temperature exists
1200 DEG C or so, rear final cooling temperature is rolled at 600~700 DEG C, hardening heat is 860~910 DEG C, and tempering temperature is 500~630
℃。
Common process production high strength steel has problems in that high heating temperature, and the consumption energy is more；Addition is a large amount of
Alloying element uses modifier treatment (quenching+high tempering), and consumption resource is more；Roller repairing whole plate structural homogenity, it is thick to
Structural homogenity and upper and lower surface structural homogenity are extremely difficult to require.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of with high-intensitive and excellent low temperature toughness steel plate and its
Manufacturing method develops the steel of this type using the technique of two-phase section warm deformation.The ingredient of such technique, steel removes C, Si
Outside Mn, a small amount of Nb, V or Ti only need to be added, does not need addition Cr, Mo and Ni element.The heating temperature of steel billet is two
Phase region, temperature be lower than 900 DEG C, and roll it is rear air-cooled, do not need control cooling.It is high-strength that the present invention can solve common process exploitation
The above problem existing for steel also provides a kind of reliable path for the exploitation of high strength steel plate.
Specific technical solution is as follows:
A kind of steel plate with high intensity and excellent low temperature toughness, for straight carbon steel or micro alloyed steel, the ingredient for including and matter
Measure percentage are as follows: C:0.03~0.30%, Si:0.10~0.50%, Mn:1.0~2.0%, P < 0.10%, S < 0.10%,
Al < 0.10%, Nb:0~0.10%, V:0~0.10%, Ti:0~0.05%, N:0.0020~0.010%, Mo:0~
0.5%, Cr:0~1.0%, Ni:0~1.0%, surplus Fe.Its tissue characteristic is there is elongation on through thickness direction
Ultrafine-grained (UFG) microstructure, crystallite dimension is less than 3 μm；With strong texture, texture is made of alpha fibers texture and gamma fiber texture.
Manufacturing method with high-intensitive and excellent low temperature toughness steel plate, the specific steps are as follows:
(1) steel billet is smelted according to mass percent, chemical component C:0.03~0.30%, Si:0.10~0.50%, Mn:
1.0~2.0%, P < 0.10%, S < 0.10%, Al < 0.10%, Nb:0~0.10%, V:0~0.10%, Ti:0~
0.05%, N:0.0020~0.010%, Mo:0~0.5%, Cr:0~1.0%, Ni:0~1.0%, surplus Fe；
(2) heating steel billet to two-phase section, while keeping ferritic phase is matrix, i.e., ferritic volume fraction is greater than
80%；Then, rolling deformation is carried out, total deformation is greater than 60%；After deformation is completed, it is air-cooled to room temperature, without control
It is cooling.
The steel plate yield strength is greater than 500MPa, and ductile-brittle transition temperature is lower than -120 DEG C, and elongation is greater than 25%.
Compared with prior art, the present invention has following advantageous effects:
(1) at low cost.Under equal performance, steel in the present invention, do not need the addition noble elements such as Cr and Ni mention come it is high
Harden ability increases intensity.This can significantly economize on resources, and reduce cost.
(2) production is simple.The production process of light plate of the present invention, roll it is rear air-cooled, do not need control cooling, this makes
The production of light plate of the present invention is simple, easily controllable.In addition, control cooling, it is difficult to ensure that steel plate thickness direction, width direction and
The structure property uniformity of length direction.Therefore, the steel plate in the present invention has very big advantage in structural homogenity.
(3) high production efficiency.It is different with conventional cooling controlling and rolling controlling process in the production process of light plate of the present invention, it is not required to
Heating steel billet to 1200 DEG C, it only need to be heated to two-phase section, production efficiency is remarkably improved, economizes on resources simultaneously.
Detailed description of the invention
Fig. 1 is the impact flexibility of Examples 1 to 3 steel plate.
Fig. 2 is that the EBSD of 1 steel plate tissue of embodiment analyzes result.Wherein, left figure is crystal boundary distribution map, and right figure is texture.
Wherein heavy black indicates big angle crystal boundary, and misorientation is greater than 15 °, thin black line expression low angle boundary, 2 °~15 ° of misorientation.
Fig. 3 is that the EBSD of 2 steel plate tissue of embodiment analyzes result.Wherein, left figure is crystal boundary distribution map, and right figure is texture.
Wherein heavy black indicates big angle crystal boundary, and misorientation is greater than 15 °, thin black line expression low angle boundary, 2 °~15 ° of misorientation.
Fig. 4 is that the EBSD of 3 steel plate tissue of embodiment analyzes result.Wherein, left figure is crystal boundary distribution map, and right figure is texture.
Wherein heavy black indicates big angle crystal boundary, and misorientation is greater than 15 °, thin black line expression low angle boundary, 2 °~15 ° of misorientation.
Fig. 5 is that the EBSD of TMCP technique steel plate tissue analyzes result.Wherein, left figure is crystal boundary distribution map, and right figure is texture.
Wherein heavy black indicates big angle crystal boundary, and misorientation is greater than 15 °, thin black line expression low angle boundary, 2 °~15 ° of misorientation.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings, but protection scope of the present invention is not by attached
Figure and embodiment are limited.
A kind of at low cost, production simply has the steel plate of high intensity and excellent low temperature toughness, chemical component quality percentage
Number is C:0.03~0.30%, Si:0.10~0.50%, Mn:1.0~2.0%, P < 0.10%, S < 0.10%, Al <
0.10%, Nb:0~0.10%, V:0~0.10%, Ti:0~0.05%, N:0.0020~0.010%, Mo:0~0.5%,
Cr:0~1.0%, Ni:0~1.0%, surplus Fe；
Embodiment 1:
It is smelted according to above-mentioned chemical component, practical chemical component mass percent is as follows: C-0.10%, Si-
0.32%, Mn-1.5%, P-0.015%, S-0.003%, Nb-0.04%, V-0.06%, Ti-0.015%, remaining as Fe.
By heating steel billet to 810 DEG C, and 1h is kept the temperature, keeps steel billet temperature uniform.Then progress warm deformation, final plate thickness 7mm,
Thickness to total reduction be 76%.In the operation of rolling, if steel billet temperature drop is too big, steel billet can be returned to concurrent heating in heating furnace.After rolling, nothing
Cooling need to be controlled, steel plate is air-cooled to room temperature
Embodiment 2:
It is smelted according to above-mentioned chemical component, practical chemical component is as follows:
C-0.03%, Si-0.10%, Mn-1.0%, P-0.03%, S-0.03%, Nb-0.02%, V-0.02%, Ti-
0.010%, remaining as Fe.
By heating steel billet to 780 DEG C, and 1h is kept the temperature, keeps steel billet temperature uniform.Then progress warm deformation, final plate thickness 7mm,
Thickness to total reduction be 76%.In the operation of rolling, if steel billet temperature drop is too big, steel billet can be returned to concurrent heating in heating furnace.After rolling, nothing
Cooling need to be controlled, steel plate is air-cooled to room temperature.
Embodiment 3:
It is smelted according to above-mentioned chemical component, practical chemical component is as follows:
C-0.30%, Si-0.50%, Mn-2.0%, P-0.02%, S-0.02%, Nb-0.10%, V-0.10%, Ti-
0.05%, remaining as Fe.
By heating steel billet to 810 DEG C, and 1h is kept the temperature, keeps steel billet temperature uniform.Then progress warm deformation, final plate thickness 7mm,
Thickness to total reduction be 76%.In the operation of rolling, if steel billet temperature drop is too big, steel billet can be returned to concurrent heating in heating furnace.After rolling, nothing
Cooling need to be controlled, steel plate is air-cooled to room temperature.
Comparative example
Plate thickness is 7mm.The start rolling temperature of rough rolling process is 1070 DEG C, and finishing temperature is 1050 DEG C.The open rolling of finishing stands
Temperature is 900 DEG C, and finishing temperature is 880 DEG C, is air-cooled to room temperature after rolling.
Tensile property detection: along the rolling direction of steel plate, pole tensile sample is processed, sample parallel zone diameter is 5mm, former
Beginning gauge length is 25mm.Stretching experiment is carried out on 4206 tensile testing machine of Instron, using crossbeam control model, speed is
3mm/min。
Impact flexibility detection: along the rolling direction of steel plate, processing dimension is thickness 5mm × wide 10mm × long 55mm half thickness
Charpy bar, and the V-notch quasi- in length direction middle position through-thickness opening of bid.According to national standard GB/T 229-
2007 carry out impact experiment in Mei Tesi ZBC2452-B pendulum experimental machine, and experimental temperature is between 20~-196 DEG C, Mei Gewen
Degree makees three samples, and impact energy values take the average value of three experimental results.
Structure observation: taking metallographic specimen in 1/4 width position of steel plate, scans electricity using ZEISS ULTRA55 Flied emission
Mirror carries out EBSD analysis to the tissue of 1/4 thickness position.
The intensity and elongation of embodiment steel plate
The intensity and elongation of Examples 1 to 3 steel plate and comparative example steel plate are as shown in table 1, it can be seen that in embodiment
Steel plate with respect to TMCP technique steel plate, have higher intensity, yield strength improve 64~158MPa, tensile strength improve 52~
118MPa.Although the elongation of embodiment light plate is below the elongation of TMCP technique steel plate, generally in higher level,
25% or more.
The intensity and elongation of table 1 Examples 1 to 3 steel plate and comparative example steel plate
| Technique | Yield strength, MPa | Tensile strength, MPa | Elongation, % |
| - 810 DEG C of warm deformation | 518 | 597 | 32.7 |
| - 780 DEG C of warm deformation | 563 | 619 | 29.4 |
| - 750 DEG C of warm deformation | 612 | 663 | 25.8 |
| TMCP technique | 454 | 545 | 37.8 |
The impact flexibility of embodiment steel plate: the impact flexibility of embodiment steel plate is as shown in Figure 2.For TMCP as a comparison
On ballistic work temperature curve, after upper mounting plate (20~-40 DEG C), with the reduction of temperature, there is the fast prompt drop of ballistic work in technique steel plate
Low phenomenon, ductile-brittle transition temperature are -108 DEG C.Steel plate in Examples 1 to 3 all has high toughness, especially has excellent
Different low-temperature flexibility, cold stage, ballistic work compare slow with the reduction of temperature.The ductile-brittle transiton of Examples 1 to 3 steel plate
Temperature is respectively -149 DEG C, -125 DEG C and -135 DEG C, and ductile-brittle transition temperature is lower than -120 DEG C.
The tissue of embodiment steel plate: the EBSD analysis of Examples 1 to 3 steel plate tissue is as shown in figs. 2 to 4.Three embodiments
The tissue of light plate realizes fine, and average grain size is respectively 2.8 μm, 2.0 μm and 1.6 μm.Tissue is in flattening shape,
It include a certain amount of low angle boundary.Embodiment steel plate has stronger alpha fibers texture and gamma fiber texture.Steel under TMCP technique
The tissue of plate is more coarse, and ferrite grain size is 6.8 μm, and texture is very weak.
Claims (3)
1. a kind of with high-intensitive and excellent low temperature toughness steel plate, which is characterized in that be straight carbon steel or micro alloyed steel, include
Ingredient and mass percent are as follows: C:0.03~0.30%, Si:0.10~0.50%, Mn:1.0~2.0%, P < 0.10%, S <
0.10%, Al < 0.10%, Nb:0~0.10%, V:0~0.10%, Ti:0~0.05%, N:0.0020~0.010%, Mo:
0~0.5%, Cr:0~1.0%, Ni:0~1.0%, surplus Fe.Its tissue characteristic is have on through thickness direction and elongate
Ultrafine-grained (UFG) microstructure, crystallite dimension is less than 3 μm；With strong texture, texture is made of alpha fibers texture and gamma fiber texture.
2. the manufacturing method with high-intensitive and excellent low temperature toughness steel plate according to claim 1, which is characterized in that
Specific step is as follows:
(1) according to mass percent smelt steel billet, chemical component C:0.03~0.30%, Si:0.10~0.50%, Mn:1.0~
2.0%, P < 0.10%, S < 0.10%, Al < 0.10%, Nb:0~0.10%, V:0~0.10%, Ti:0~0.05%, N:
0.0020~0.010%, Mo:0~0.5%, Cr:0~1.0%, Ni:0~1.0%, surplus Fe；
(2) heating steel billet to two-phase section, while keeping ferritic phase is matrix, i.e., ferritic volume fraction is greater than 80%；
Then, rolling deformation is carried out, total deformation is greater than 60%；After deformation is completed, it is air-cooled to room temperature, without controlling cooling.
3. the manufacturing method with high-intensitive and excellent low temperature toughness steel plate according to claim 1, it is characterised in that:
The steel plate yield strength is greater than 500MPa, and ductile-brittle transition temperature is lower than -120 DEG C, and elongation is greater than 25%.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110565019A (en) * | 2019-09-29 | 2019-12-13 | 山东钢铁股份有限公司 | high-strength low-temperature-resistant forklift gantry section steel and preparation method thereof |
| CN110819878A (en) * | 2019-10-23 | 2020-02-21 | 舞阳钢铁有限责任公司 | Steel plate with excellent low-temperature toughness for explosive cladding and production method thereof |
| CN111074156A (en) * | 2019-12-26 | 2020-04-28 | 舞阳钢铁有限责任公司 | Ultrahigh-strength steel plate with excellent low-temperature toughness and production method thereof |
| CN114517254A (en) * | 2022-02-28 | 2022-05-20 | 南京工程学院 | Low-temperature-resistant flat bulb steel for ships and preparation method thereof |
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