CN102605294B - Easy-to-weld high-strength and high-toughness steel plate with yield strength of 800MPa - Google Patents
Easy-to-weld high-strength and high-toughness steel plate with yield strength of 800MPa Download PDFInfo
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- CN102605294B CN102605294B CN201210113828.9A CN201210113828A CN102605294B CN 102605294 B CN102605294 B CN 102605294B CN 201210113828 A CN201210113828 A CN 201210113828A CN 102605294 B CN102605294 B CN 102605294B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 50
- 239000010959 steel Substances 0.000 title claims abstract description 50
- 238000005096 rolling process Methods 0.000 claims abstract description 32
- 238000003466 welding Methods 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 22
- 238000001816 cooling Methods 0.000 claims abstract description 20
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 9
- 239000000126 substance Substances 0.000 claims abstract description 9
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 7
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 6
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 6
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 6
- 229910001563 bainite Inorganic materials 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims description 12
- 241001062472 Stokellia anisodon Species 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 5
- 238000007906 compression Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 2
- 238000003723 Smelting Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 15
- 229910045601 alloy Inorganic materials 0.000 abstract description 2
- 239000000956 alloy Substances 0.000 abstract description 2
- 238000005452 bending Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000005496 tempering Methods 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000007669 thermal treatment Methods 0.000 description 2
- 238000005275 alloying Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 230000005713 exacerbation Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 230000000930 thermomechanical effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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Abstract
The invention relates to an easily-welded high-strength and high-toughness steel plate with the yield strength of 800MPa and a production process thereof, wherein the easily-welded high-strength and high-toughness steel plate comprises the following chemical components in percentage by weight: c: 0.04-0.07%, Si: 0.15 to 0.35%, Mn: 1.4-1.8%, P is less than or equal to 0.020%, S is less than or equal to 0.010%, Cr: 0.10 to 0.20%, Ni: 0.10 to 0.20%, Mo: 0.15 to 0.25%, Nb: 0.04-0.06%, Ti: 0.01-0.02%, B: 0.001-0.002%, and the balance of Fe and FeAnd (4) inevitable impurities. The invention ensures Pcm not more than 0.20% by reasonably designing alloy components, and the finished product of the steel plate has the thickness not less than 15mm, the structure of bainite and the yield strength R by adopting the controlled rolling and controlled cooling processp0.2Greater than 800MPa, tensile strength RmMore than 900MPa, elongation after fracture more than 14%, and impact energy at minus 40 ℃ more than 100J. The invention has simple production process, short period, low cost, good welding performance, cold bending performance and plate shape of the steel plate, and can be widely used in the fields of engineering machinery, building structures, bridge structures and the like.
Description
Technical field
The present invention relates to a kind of high strength steel plate, particularly a kind of yield strength of 800 MPa grade easily welds high strength steel plate and production technique thereof.
Background technology
Easily welding high strength steel is one of important structural timber, is widely used in the fields such as machinofacture, bridge structure, building structure.Along with various engineering constructions are to large scale development, further urgent to the requirement of Structure weight reduce, the intensity rank of steel plate used improves gradually, require steel plate to there is high intensity and low-temperature flexibility, simultaneously, for the consideration of simplifying operational procedure and reduction construction costs, require again to there is good welding property, there is lower welding crack sensibility index (Pcm≤0.20%).
From the sixties in 20th century, the development of easy welding high strength steel has successively been carried out in countries in the world.The production of at present, easily welding high strength steel plate is divided into modified and non-modified two kinds in technique.Hardening and tempering process stability is better, is relatively suitable for large thickness steel plate, and still, hardening and tempering process need to carry out twice thermal treatment, complex procedures, and the production cycle is longer, and cost is higher; Non-tempering process is to take thermomechanical controlled rolling as basis, adopts suitable process for cooling, fully utilizes various strengthening means, can significantly reduce steel interalloy element addition, improves welding property.Owing to not needing to carry out complicated thermal treatment, thus the production cycle shorten dramatically, manufacturing cost is also minimized.
The current manufacture patents of existing many easily welding high strength steel plates, from performance, patent CN102191430A, CN1932063A, CN101787489A, CN101418418A etc., its intensity rank all≤690MPa, do not reach 800MPa of the present invention.From technique, for existing patent or the currently available products that relates to easy welding high strength steel plate, major part is all to adopt controlled rolling+off-line heat-treating methods, to obtain high tough performance requriements, as patent CN101812634A, employing be hardening and tempering process, although its intensity rank has reached 800MPa, but the heat treatment step having more makes the production cycle longer, and production efficiency is low.
Summary of the invention
The object of the invention is to propose a kind of yield strength of 800 MPa grade and easily weld high strength steel plate and production technique thereof.By reasonable interpolation alloying element, welding crack sensibility indices P cm≤0.2%, adopts cooling controlling and rolling controlling process, makes its steel plate be organized as bainite, yield strength R
p0.2> 800MPa, tensile strength R
m> 900MPa, 14% ,-40 ℃ of ballistic work > 100J of elongation after fracture >.
For achieving the above object, the present invention adopts following technical scheme:
Described steel plate chemical composition is by weight percentage composed as follows: C:0.04～0.07%, Si:0.15～0.35%, Mn:1.4～1.8%, P≤0.020%, S≤0.010%, Cr:0.10～0.20%, Ni:0.10～0.20%, Mo:0.15～0.25%, Nb:0.04～0.06%, Ti:0.01～0.02%, B:0.001～0.002%, all the other are Fe and inevitable impurity, and meet following welding crack sensibility index:
Pcm＝C+Si/30+Mn/20+Cu/20+Cr/20+Mo/15+Ni/60+V/10+5B≤0.20％。
Below yield strength of 800 MPa grade of the present invention is easily welded to the effect of contained component and the selection of consumption concrete analysis explanation thereof in high strength steel plate:
C:C plays an important role to the intensity of material, low-temperature flexibility, welding property.The content of C is controlled too low (as lower than 0.025%), can not proof strength, and during too high levels (as higher than 0.10%), the more difficult control of welding property and low-temperature flexibility.In the present invention, C content is chosen in 0.04～0.07%, can guarantee certain intensity, toughness and good weldability.
Si:Si is the bioelement of deoxidation in steel making, can increase the intensity of material, but low-temperature flexibility and the welding property of infringement material, so the content of Si is controlled at 0.15～0.35%.
Mn:Mn is typical austenite stabilizer element, can improve the hardening capacity of steel, and play solution strengthening effect, under low-carbon (LC) condition, to improving the intensity of material, have significant effect, therefore, when the higher steel of production intensity, the content of Mn should not be too low, and the relative low price of Mn, but excessive Mn makes the more difficult control of casting process, easily with the element formation segregation such as P, S, the impact property of severe exacerbation material and welding property.Therefore the content of Mn is controlled at 1.40～1.80%.
Cr:Cr is one of strengthening element important in steel, can make CCT curve move to right.Cr and Mn coordinate, and can effectively improve the hardenability of steel, and its segregation tendency is little compared with Mn.But Cr too high levels, can reduce the toughness of steel, increases welding crack sensibility.Therefore the content of Cr is controlled at 0.10～0.20%.
Ni:Ni can improve the hardening capacity of steel, significantly improving the low-temperature flexibility of steel, is the favourable element that improves the obdurability of steel, substantially can not cause disadvantageous effect to the weldability of steel and welding heat influence area toughness, but too high levels can increase cost of alloy, therefore be controlled at 0.10～0.20%.
Mo:Mo can significantly improve the intensity of steel plate, contributes to the formation of fine bainite, but too high levels has not only increased production cost, and has reduced the welding property of material.Therefore the interpolation scope of Mo is chosen in 0.15～0.25%.
Nb:Nb is the important element in rolling controlled and cooling controlled steel, and Nb adds the recrystallize that can stop after austenite deformation, improves austenite non-recrystallization temperature.Nb can also significantly suppress ferritic transformation, and along with the increase of cooling rate, the restraining effect of Nb strengthens, ferrite grain size refinement.Therefore the content of Nb is controlled at 0.04～0.06%.
The Main Function of Ti:Ti is fixed nitrogen and deoxidation completely, the too high levels of Ti, and nitrogen fixation effect reaches capacity, and superfluous Ti can make the toughness of material decline, so Ti content is controlled at 0.01～0.02%.
B:B can improve the hardening capacity of steel plate, but excessive B easily causes Grain Boundary Segregation, impelling strength and the weldability of infringement steel plate, so B content is controlled at 0.001～0.002%.
P, S:P, S, as the harmful element in steel, have larger detrimental effect to the low-temperature impact of steel and weldability, and it is more low better to require in theory, but consider steel-making operability and steel-making cost, control P≤0.020%, S≤0.010%.
Yield strength of 800 MPa grade easily welds a production technique for high strength steel plate, and it comprises the steps:
(1) according to above-mentioned chemical component weight per-cent, smelt, be cast into slab;
(2), in heating process, slab heating temperature is 1200～1220 ℃, is incubated 1.5～2.5h;
(3) in rolling process, roughing start rolling temperature≤1030 ℃, roughing finishing temperature >=980 ℃, pass deformation rate is 10～30%; 870～890 ℃ of finish rolling start rolling temperatures, finish rolling finishing temperature is 770～800 ℃, pass deformation rate is 10～30%, overall compression ratio >=5;
(4) in refrigerating work procedure, adopt water cooling system, cooling rate is 20～40 ℃/s, and final cooling temperature is 350～450 ℃, and air cooling is to room temperature afterwards.
The present invention, owing to having adopted above technical scheme, makes it compared with prior art, has the following advantages and positively effect:
1, by rational designing chemical composition, its welding crack sensibility indices P cm≤0.20%, Plate Welding excellent property.Adopt controlled rolling+Controlled cooling process, without subsequent heat treatment, production technique is simple, and the cycle is short, and efficiency is high.
2, by appropriate design composition and rolling technology, the steel plate making is organized as bainite, yield strength R
p0.2> 800Mpa, tensile strength R
m> 900Mpa, 14% ,-40 ℃ of ballistic work > 100J of elongation after fracture >.
Accompanying drawing explanation
Fig. 1 is the microstructure picture of embodiment 1 light plate vertical section;
Fig. 2 is the microstructure picture of embodiment 2 light plate vertical sections;
Fig. 3 is the microstructure picture of embodiment 3 light plate vertical sections;
Embodiment
Below in conjunction with accompanying drawing and some preferred embodiments, technical scheme of the present invention is described in further detail.
Embodiment 1
This steel (wt%) composed of the following components: C:0.06%, Si:0.25%, Mn:1.59%, P:0.0077%, S:0.0059%, Cr:0.15%, Ni:0.15%, Mo:0.20%, Nb:0.05%, Ti:0.016%, B:0.0016%, all the other are Fe and inevitable impurity, welding crack sensibility index:
Pcm＝C+Si/30+Mn/20+Cu/20+Cr/20+Mo/15+Ni/60+V/10+5B＝0.18％。
(1) according to above-mentioned chemical component weight per-cent, smelt, be cast into slab;
(2), in heating process, slab heating temperature is 1200～1220 ℃, is incubated 1.5～2.5h;
(3) in rolling process, roughing start rolling temperature≤1030 ℃, roughing finishing temperature >=980 ℃, pass deformation rate is 10～30%; 870～890 ℃ of finish rolling start rolling temperatures, finish rolling finishing temperature is 770～800 ℃, pass deformation rate is 10～30%, overall compression ratio >=5, the thick 30mm of finished product;
(4) in refrigerating work procedure, adopt water cooling system, cooling rate is 30 ℃/s, cold is eventually 400 ℃.Obtain the mechanical property of steel plate in Table 1.
Embodiment 2
This steel (wt%) composed of the following components: C:0.06%, Si:0.25%, Mn:1.59%, P:0.0077%, S:0.0059%, Cr:0.15%, Ni:0.15%, Mo:0.20%, Nb:0.05%, Ti:0.016%, B:0.0016%, all the other are Fe and inevitable impurity, welding crack sensibility index:
Pcm＝C+Si/30+Mn/20+Cu/20+Cr/20+Mo/15+Ni/60+V/10+5B＝0.18％。
(1) according to above-mentioned chemical component weight per-cent, smelt, be cast into slab;
(2), in heating process, slab heating temperature is 1200～1220 ℃, is incubated 1.5～2.5h;
(3) in rolling process, roughing start rolling temperature≤1030 ℃, roughing finishing temperature >=980 ℃, pass deformation rate is 10～30%; 870～890 ℃ of finish rolling start rolling temperatures, finish rolling finishing temperature is 770～800 ℃, pass deformation rate is 10～30%, overall compression ratio >=5, the thick 30mm of finished product;
(4) in refrigerating work procedure, adopt water cooling system, cooling rate is 20 ℃/s, cold is eventually 350 ℃.Obtain the mechanical property of steel plate in Table 1.
Embodiment 3
This steel (wt%) composed of the following components: C:0.06%, Si:0.25%, Mn:1.59%, P:0.0077%, S:0.0059%, Cr:0.15%, Ni:0.15%, Mo:0.20%, Nb:0.05%, Ti:0.016%, B:0.0016%, all the other are Fe and inevitable impurity, welding crack sensibility index:
Pcm＝C+Si/30+Mn/20+Cu/20+Cr/20+Mo/15+Ni/60+V/10+5B＝0.18％。
(1) according to above-mentioned chemical component weight per-cent, smelt, be cast into slab;
(2), in heating process, slab heating temperature is 1200～1220 ℃, is incubated 1.5～2.5h;
(3) in rolling process, roughing start rolling temperature≤1030 ℃, roughing finishing temperature >=980 ℃, pass deformation rate is 10～30%; 870～890 ℃ of finish rolling start rolling temperatures, finish rolling finishing temperature is 770～800 ℃, pass deformation rate is 10～30%, overall compression ratio >=5, the thick 30mm of finished product;
(4) in refrigerating work procedure, adopt water cooling system, cooling rate is 40 ℃/s, cold is eventually 450 ℃.Obtain the mechanical property of steel plate in Table 1.
The easy welding high strength steel plate mechanical property that table 1 embodiment of the present invention 1-3 relates to
| R p0.2/MPa | R m/Mpa | A/％ | -40 ℃ of longitudinal Akv/J | |
| Embodiment 1 | 841 | 955 | 15.25 | 145，150，162 |
| Embodiment 2 | 823 | 949 | 14.37 | 122，135，147 |
| Embodiment 3 | 870 | 976 | 15.10 | 116，109，104 |
Note: it is the bar-shaped sample of φ 8 * 40mm that tension specimen adopts gauge length; Charpy bar is of a size of 10 * 10 * 55mm.
Claims (1)
1. a yield strength of 800 MPa grade easily welds high strength steel plate, it is characterized in that, described steel plate chemical composition is by weight percentage composed as follows: C:0.04～0.07%, Si:0.15～0.35%, Mn:1.4～1.8%, P≤0.020%, S≤0.010%, Cr:0.10～0.15%, Ni:0.10～0.20%, Mo:0.15～0.25%, Nb:0.04～0.06%, Ti:0.01～0.02%, B:0.001～0.002%, all the other are Fe and inevitable impurity, and meet following welding crack sensibility index (Pcm) requirement:
Pcm＝C+Si/30+Mn/20+Cu/20+Cr/20+Mo/15+Ni/60+V/10+5B≤0.20％；
Described steel plate is according to following explained hereafter:
(1) in smelting, casting operation, according to above-mentioned chemical component weight per-cent, smelt, be cast into slab;
(2), in heating process, slab heating temperature is 1200～1220 ℃, is incubated 1.5～2.5h;
(3) in rolling process, roughing start rolling temperature≤1030 ℃, roughing finishing temperature >=980 ℃, pass deformation rate is 10～30%; 870～890 ℃ of finish rolling start rolling temperatures, finish rolling finishing temperature is 770～800 ℃, pass deformation rate is 10～30%, overall compression ratio >=5;
(4) in refrigerating work procedure, adopt water cooling system, cooling rate is 20～40 ℃/s, and final cooling temperature is 350～450 ℃, and air cooling is to room temperature afterwards;
Obtained steel plate be organized as bainite,
This steel plate yield strength > 800MPa, tensile strength R
m> 900MPa, 14% ,-40 ℃ of ballistic work > 100J of elongation after fracture >.
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| CN108441764A (en) * | 2018-04-02 | 2018-08-24 | 首钢集团有限公司 | Cu nanometers of precipitation ultra-high strength steel plates of a kind of richness and preparation method thereof |
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| CN107385308B (en) * | 2017-06-28 | 2021-06-22 | 包头钢铁（集团）有限责任公司 | Controlled rolling and cooling process for high-strength wear-resistant bainite-martensite multiphase structure steel rail for railway |
| CN112375978B (en) * | 2020-10-30 | 2022-04-05 | 舞阳钢铁有限责任公司 | Steel plate for construction and production method thereof |
| CN114480960B (en) * | 2021-12-24 | 2023-05-05 | 安阳钢铁集团有限责任公司 | 800 MPa-grade high-strength steel with low yield ratio and low-temperature toughness and production process thereof |
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| CN101748333A (en) * | 2009-12-25 | 2010-06-23 | 舞阳钢铁有限责任公司 | Low-carbon-equivalent high-strength wear-resistant steel plate and production method thereof |
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| CN101748333A (en) * | 2009-12-25 | 2010-06-23 | 舞阳钢铁有限责任公司 | Low-carbon-equivalent high-strength wear-resistant steel plate and production method thereof |
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