CN102605294A - Easily-welding high strength and toughness steel plate with yield strength of 800MPa, and production technology thereof - Google Patents
Easily-welding high strength and toughness steel plate with yield strength of 800MPa, and production technology thereof Download PDFInfo
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Abstract
The invention relates to an easily-welding high strength and toughness steel plate with yield strength of 800MPa, and a production technology of the easily-welding high strength and toughness steel plate. The easily-welding high strength and toughness steel plate comprises the following chemical compositions in percentage by weight: 0.04-0.07% of C, 0.15-0.35% of Si, 1.4-1.8% of Mn, less than or equal to 0.020% of P, less than or equal to 0.01% of S, 0.10-0.20% of Cr, 0.10-0.20% of Ni, 0.15-0.25% of Mo, 0.04-0.06% of Nb, 0.01-0.02% of Ti, 0.001-0.002% of B, and the balance of Fe and unavoidable impurities. According to the invention, due to the adoption of the reasonable design of alloy composition, Pcm is ensured to be less than or equal to 0.20%; and after a technology of controlling rolling and cooling is adopted, the thickness of the prepared steel plate is more than or equal to 15mm, a structure of the steel plate is bainite, the yield strength Rp 0.2 is more than 800MPa, the tensile strength Rm is larger than or equal to 900MPa, the percentage elongation after fracture is more than 14%, and the ballistic work is more than 100J at the temperature of -40 DEG C. The easily-welding high strength and toughness steel plate is simple in production technology, short in period, low in cost, and good in welding performance, cold bending performance and plate type of the steel plate, and can be widely applied to the fields such as engineering machinery, building structure, bridge structure 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 is prone to welding high strength steel plate and production technique thereof.
Background technology
Being prone to the welding high strength steel is one of important engineering structured material, is widely used in the fields such as machinofacture, bridge structure, building structure.Along with various engineering constructions to large scale development; Requirement to the structure loss of weight is urgent further, and the intensity rank of used steel plate improves gradually, requires steel plate to have high intensity and low-temperature flexibility; Simultaneously; From simplifying operational procedure and the consideration that reduces construction costs, require to have good welding property again, promptly have 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.At present, the production of easy welding high strength steel plate is divided into modified and non-modified two kinds on technology.Hardening and tempering process stability better relatively is suitable for big thickness steel plate, and still, hardening and tempering process need carry out twice thermal treatment, complex procedures, and the production cycle is longer, and cost is higher; Non-tempering process is to be the basis with the mechanical controlled rolling of heat, adopts suitable process for cooling, fully utilizes various reinforcement means, can reduce steel interalloy element addition significantly, improves welding property.Owing to need not carry out complicated heat treatment, thus the production cycle shorten dramatically, manufacturing cost also is minimized.
At present existing many manufacturing patents that are prone to the welding high strength steel plates are seen from performance, patent CN102191430A, CN1932063A, CN101787489A, CN101418418A etc., its intensity rank all≤690MPa, do not reach 800MPa of the present invention.From technology, for existing patent or the currently available products that is prone to the welding high strength steel plate that relate to, major part all is to adopt controlled rolling+off-line heat-treating methods; To obtain high tough performance requriements; Like patent CN101812634A, employing be hardening and tempering process, though its intensity rank has reached 800MPa; But the heat treatment step that has more makes the production cycle longer, and production efficiency is low.
Summary of the invention
The objective of the invention is to propose a kind of yield strength of 800 MPa grade and be prone to welding high strength steel plate and production technique thereof.Through 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, ys R
P0.2＞800MPa, tensile strength R
m＞900MPa, elongation after fracture＞14% ,-40 ℃ of ballistic work＞100J.
For realizing the foregoing invention purpose, the present invention adopts following technical scheme:
Said steel plate chemical ingredients is by weight percentage formed 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 unavoidable impurities, and satisfy 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 prone to the effect of contained component in the welding high strength steel plate and the selection concrete analysis explanation of consumption thereof:
C:C plays an important role to intensity, low-temperature flexibility, the welding property of material.The content of C was controlled low (as being lower than 0.025%), then can not proof strength, and during too high levels (as being higher than 0.10%), the then difficult control of welding property and low-temperature flexibility.Among the present invention, C content is chosen in 0.04～0.07%, can guarantee certain intensity, toughness and good weldableness.
Si:Si is the bioelement of deoxidation in steel making, can increase the intensity of material, but the 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 plays the solution strengthening effect; Under the low-carbon (LC) condition, the intensity that improves material is had significant effect, therefore when the higher steel of production intensity, the content of Mn should not be low excessively; And the relative low price of Mn; But excessive Mn makes and is prone to the difficult control of casting process form segregation, the impact property of severe exacerbation material and welding property with elements such as P, S.Therefore the content of Mn is controlled at 1.40～1.80%.
Cr:Cr is one of strengthening element important in the steel, and the CCT curve is moved to right.Cr and Mn cooperate, and can effectively improve the hardenability of steel, and its segregation tendency is little than Mn.But the 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, can not cause disadvantageous effect to the weldability and the welding heat influence area toughness of steel basically; But too high levels can increase cost of alloy, so be controlled at 0.10～0.20%.
Mo:Mo can significantly improve the intensity of steel plate, helps the formation of fine bainite, but too high levels has not only increased production cost, and has reduced material welding performance.Therefore the interpolation scope of Mo is chosen in 0.15～0.25%.
Nb:Nb is the important element in the rolling controlled and cooling controlled steel, and the adding of Nb can stop the recrystallize behind the 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, the ferrite grain size refinement.Therefore the content of Nb is controlled at 0.04～0.06%.
The main effect of Ti:Ti is fixed nitrogen and deoxidation fully, the too high levels of Ti, and nitrogen fixation effect reaches capacity, and superfluous Ti can make the toughness of material descend, so Ti content is controlled at 0.01～0.02%.
B:B can improve the hardening capacity of steel plate, but excessive B is prone to cause that crystal boundary gathers partially, the impelling strength and the weldableness of infringement steel plate, so B content is controlled at 0.001～0.002%.
P, S:P, S be as the harmful element in the steel, and the low-temperature impact and the weldableness of steel had bigger detrimental effect, and it is low more good more to require in theory, but considers steel-making operability and steel-making cost, control P≤0.020%, S≤0.010%.
A kind of yield strength of 800 MPa grade is prone to the production technique of welding high strength steel plate, and it comprises the steps:
(1) smelts, is cast into slab according to above-mentioned chemical component weight per-cent;
(2) in heating process, slab heating temperature is 1200～1220 ℃, insulation 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 are 770～800 ℃, and 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 makes it compared with prior art owing to adopted above technical scheme, has the following advantages and positively effect:
1, through rational designing chemical composition, its welding crack sensibility indices P cm≤0.20%, the steel plate welding property is good.Adopt controlled rolling+technology for controlled cooling, do not have follow-up thermal treatment, production technique is simple, and the cycle is short, and efficient is high.
2, through appropriate design composition and rolling technology, the steel plate that makes is organized as bainite, ys R
P0.2＞800Mpa, tensile strength R
m＞900Mpa, elongation after fracture＞14% ,-40 ℃ of ballistic work＞100J.
Description of drawings
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 done further explain.
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 unavoidable impurities, the welding crack sensibility index:
Pcm＝C+Si/30+Mn/20+Cu/20+Cr/20+Mo/15+Ni/60+V/10+5B＝0.18％。
(1) smelts, is cast into slab according to above-mentioned chemical component weight per-cent;
(2) in heating process, slab heating temperature is 1200～1220 ℃, insulation 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 are 770～800 ℃, and 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 eventually is 400 ℃.The mechanical property that obtains steel plate is seen 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 unavoidable impurities, the welding crack sensibility index:
Pcm＝C+Si/30+Mn/20+Cu/20+Cr/20+Mo/15+Ni/60+V/10+5B＝0.18％。
(1) smelts, is cast into slab according to above-mentioned chemical component weight per-cent;
(2) in heating process, slab heating temperature is 1200～1220 ℃, insulation 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 are 770～800 ℃, and 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 eventually is 350 ℃.The mechanical property that obtains steel plate is seen 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 unavoidable impurities, the welding crack sensibility index:
Pcm＝C+Si/30+Mn/20+Cu/20+Cr/20+Mo/15+Ni/60+V/10+5B＝0.18％。
(1) smelts, is cast into slab according to above-mentioned chemical component weight per-cent;
(2) in heating process, slab heating temperature is 1200～1220 ℃, insulation 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 are 770～800 ℃, and 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 eventually is 450 ℃.The mechanical property that obtains steel plate is seen table 1.
The easy welding high strength steel plate mechanical property that table 1 embodiment of the invention 1-3 relates to
| R p0.2/MPa | R m/Mpa | A/％ | -40 ℃ of vertical 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 |
Annotate: 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 (5)
1. a yield strength of 800 MPa grade is prone to the welding high strength steel plate; It is characterized in that; Said steel plate chemical ingredients is by weight percentage formed 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 unavoidable impurities, and satisfy 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％。
2. yield strength of 800 MPa grade according to claim 1 is prone to the welding high strength steel plate, it is characterized in that the bainite that is organized as of obtained steel plate.
3. yield strength of 800 MPa grade according to claim 1 and 2 is prone to the welding high strength steel plate, it is characterized in that: this steel plate ys＞800MPa, tensile strength R
m＞900MPa, elongation after fracture＞14% ,-40 ℃ of ballistic work＞100J.
4. a kind of yield strength of 800 MPa grade according to claim 1 is prone to the welding high strength steel plate, is characterised in that it is according to following explained hereafter:
(1) in smelting, casting operation, smelts, is cast into slab according to the described chemical component weight per-cent of claim 1;
(2) in heating process, slab heating temperature is 1200～1220 ℃, insulation 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 are 770～800 ℃, and 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.
5. a yield strength of 800 MPa grade is prone to the production technique of welding high strength steel plate, and it comprises the steps:
(1) in smelting, casting operation; According to 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 chemical component weight per-cent smeltings, be cast into slab for Fe and unavoidable impurities;
(2) in heating process, slab heating temperature is 1200～1220 ℃, insulation 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 are 770～800 ℃, and 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.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107385308A (en) * | 2017-06-28 | 2017-11-24 | 包头钢铁（集团）有限责任公司 | The cooling controlling and rolling controlling process of railway high-strength wearable shellfish horse heterogeneous structure rail |
| 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 |
| CN112375978A (en) * | 2020-10-30 | 2021-02-19 | 舞阳钢铁有限责任公司 | Steel for construction and production method thereof |
| CN114480960A (en) * | 2021-12-24 | 2022-05-13 | 安阳钢铁集团有限责任公司 | Low-yield-ratio low-temperature-toughness 800 MPa-grade high-strength steel and production process thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001131680A (en) * | 1999-11-10 | 2001-05-15 | Sumitomo Metal Ind Ltd | High strength and high toughness non-heattreated cold formed parts and method for producing same |
| 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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2012
- 2012-04-18 CN CN201210113828.9A patent/CN102605294B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001131680A (en) * | 1999-11-10 | 2001-05-15 | Sumitomo Metal Ind Ltd | High strength and high toughness non-heattreated cold formed parts and method for producing same |
| 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 |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107385308A (en) * | 2017-06-28 | 2017-11-24 | 包头钢铁（集团）有限责任公司 | The cooling controlling and rolling controlling process of railway high-strength wearable shellfish horse heterogeneous structure rail |
| 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 |
| CN112375978A (en) * | 2020-10-30 | 2021-02-19 | 舞阳钢铁有限责任公司 | Steel for construction and production method thereof |
| CN114480960A (en) * | 2021-12-24 | 2022-05-13 | 安阳钢铁集团有限责任公司 | Low-yield-ratio low-temperature-toughness 800 MPa-grade high-strength steel and production process 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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