CN102433507B - Low-yield-ratio easy-to-weld high-strength steel plate and preparation process thereof - Google Patents
Low-yield-ratio easy-to-weld high-strength steel plate and preparation process thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 45
- 239000010959 steel Substances 0.000 title claims abstract description 45
- 238000002360 preparation method Methods 0.000 title abstract description 6
- 238000005096 rolling process Methods 0.000 claims abstract description 37
- 238000001816 cooling Methods 0.000 claims abstract description 25
- 238000003466 welding Methods 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 16
- 239000000126 substance Substances 0.000 claims abstract description 11
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims description 13
- 241001062472 Stokellia anisodon Species 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 2
- 238000003723 Smelting Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 20
- 229910001563 bainite Inorganic materials 0.000 abstract description 4
- 229910000859 α-Fe Inorganic materials 0.000 abstract description 4
- 229910045601 alloy Inorganic materials 0.000 abstract description 2
- 239000000956 alloy Substances 0.000 abstract description 2
- 238000005452 bending Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 239000000203 mixture Substances 0.000 description 6
- 229910052710 silicon Inorganic materials 0.000 description 6
- 229910052804 chromium Inorganic materials 0.000 description 5
- 229910052748 manganese Inorganic materials 0.000 description 5
- 238000002791 soaking Methods 0.000 description 5
- 229910001566 austenite Inorganic materials 0.000 description 4
- 229910052750 molybdenum Inorganic materials 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 4
- 229910052758 niobium Inorganic materials 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- 238000007669 thermal treatment Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910000885 Dual-phase steel Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 230000006353 environmental stress Effects 0.000 description 1
- 230000005713 exacerbation Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 238000013000 roll bending Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
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Abstract
The invention discloses a low-yield-ratio easy-welding high-strength steel plate and a preparation process thereof. The steel plate comprises the following chemical components in percentage by weight: 0.07-0.09% of C, 0.20-0.35% of Si, 1.30-1.50% of Mn, less than or equal to 0.025% of P, less than or equal to 0.010% of S, 0.25-0.45% of Cr, 0.02-0.035% of Nb, 0.0005-0.0020% of B, and the balance of Fe and inevitable impurities. According to the invention, through reasonable design of alloy components and adoption of controlled rolling and controlled cooling processes, the thickness of the prepared steel plate finished product is more than or equal to 15mm, the structure is ferrite and bainite, the yield strength is 460-560 MPa, the tensile strength is 700-790 MPa, the elongation after fracture is more than or equal to 14%, and the yield ratio is less than 0.7. The invention has simple production process, good welding performance, cold bending performance and plate shape, and can be widely used in the fields of bridges, building structures, engineering machinery and the like.
Description
Technical field
The present invention relates to a kind of High Strength Steel Plate, particularly the easy welding high-strength steel plate of a kind of low yield strength ratio and preparation technology thereof.
Background technology
High-strength steel is one of important structural timber, is widely used in the fields such as shipbuilding, bridge structure, building structure, transportation by railroad, machinofacture.Along with society and expanding economy, Iron And Steel Industry is faced with the problems such as resource price is surging, the demand speedup eases up, environmental stress increase.Therefore, reduce the alloy addition level of steel, reduce production process, shorten the production cycle, raise the efficiency, develop there is low cost, good comprehensive mechanical performance and the ferrous materials of use properties, become the important directions of ferrous materials research, require steel to there is good obdurability, weldability and security and stability.
The manufacture patent of at present existing many low yield strength ratio High Strength Steel Plates, as CN101619423A, CN101775552A, CN101497972A, CN101660108A, CN101660099A, CN101775561A, CN101985725A, CN101649420A etc., from one-tenth, assign to, alloying element adds more, what adopt is Ni, Mo, Cu composition system, has mostly added precious metal as Ni, Mo etc., has increased the production cost of steel, the Pcm value of steel plate is also higher simultaneously, causes welding property not good.
Although the technology contents that patent CN101857942A, CN101880825A, CN101792882A, CN102212743A etc. relate to does not adopt Ni, Mo composition system, use controlled rolling and Controlled cooling process, but the product of its production is the roll bending of thickness≤10mm, be not suitable for the manufacture of thicker product.
From production technology characteristic, the research and production of current low yield strength ratio high-strength steel, the overwhelming majority is all to adopt controlled rolling+off-line heat-treating methods, to obtain the high-intensity performance requriements of low yield strength ratio, the technology contents related to as patents such as CN1786246A, CN101328564A, CN101260495A, CN101613828A, CN102011068A adopts the thermal treatment process such as intercritical hardening, intercritical hardening+tempering.Although yield tensile ratio that can the decrease steel plate with aforesaid method, used heat treatment step to make the production cycle longer, cost increases, and production efficiency is lower.
Summary of the invention
The object of the invention is to propose the easy welding high-strength steel plate of a kind of low yield strength ratio and preparation technology thereof.By reasonable interpolation alloying element, welding crack sensibility indices P cm≤0.2%, adopt controlled rolling+Controlled cooling process, make its steel plate be organized as ferrite+bainite, yield strength Rp0.2 is 460～560MPa, and tensile strength Rm is 700～790MPa, elongation after fracture >=14%, yield tensile ratio (Rp0.2/Rm)<0.7 ,-20 ℃ of ballistic work>80J.
For achieving the above object, the present invention adopts following technical scheme:
The easy welding high-strength steel plate of a kind of low yield strength ratio, its chemical composition is by weight percentage: C 0.07～0.09%, Si 0.20～0.35%, and Mn 1.30～1.50%, P≤0.025%, S≤0.010%, Cr 0.25～0.45%, Nb0.02～0.035%, and B 0.0005～0.0020%, 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 to the selection concrete analysis explanation of the effect of contained component in the easy welding high-strength steel plate of low yield strength ratio of the present invention and consumption thereof:
C:C plays an important role to intensity, low-temperature flexibility, the welding property of material.The content of carbon is controlled too low (generally lower than 0.025%), can not proof strength, and during too high levels (generally higher than 0.10%), the more difficult control of welding property and low-temperature flexibility.In the present invention, carbon content is chosen in 0.07～0.09%, can guarantee bainite content certain in steel, guarantees certain intensity, toughness and good weldability.
Si:Si can enlarge α-γ district, and the temperature that makes critical zone process is widened.Silicon is the bioelement of deoxidation in steel making simultaneously, can increase the intensity of material, but low-temperature flexibility and the welding property of infringement material, so the content of silicon is controlled at 0.20～0.35%.
The Mn:Mn element is typical austenite stabilizer element, can improve the hardening capacity of steel, and play solution strengthening effect, under the low-carbon (LC) condition, the intensity that improves material is had to 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, the easy and elements such as P, S form segregations, the impact property of severe exacerbation material and welding property.Therefore the content of Mn is controlled at 1.30～1.50%.
Cr:Cr can significantly improve the hardening capacity of steel, postpones perlitic transformation, promotes that C spreads to austenite simultaneously, and reduces ferritic yield strength, is conducive to obtain the dual phase steel of low yield strength ratio.Therefore the content of Cr is controlled at 0.25～0.45%.
Nb:Nb is the important element in rolling controlled and cooling controlled steel, can stop the adding of Nb the recrystallize after austenite deformation, improves austenite recrystallization temperature.Nb can 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 0.02～0.035%.
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.The content of B is controlled at 0.0005～0.002%.
P, S:P, S be as harmful being mingled with in steel, and low-temperature impact and the weldability of steel had to larger detrimental effect, and it is more low better to require in theory, but considers steel-making operability and steel-making cost, controls P≤0.025%, S≤0.010%.
The preparation technology of the easy welding high-strength steel plate of a kind of low yield strength ratio, it comprises the steps:
(1) smelt, be cast into slab according to above-mentioned chemical component weight per-cent;
(2), to above-mentioned heating of plate blank, Heating temperature is 1180～1220 ℃, soaking time 1.5～2.5h;
(3) controlled rolling, roughing start rolling temperature≤1000 ℃, roughing finishing temperature >=970 ℃, pass deformation rate is 10～30%; 870～850 ℃ of finish rolling start rolling temperatures, the finish rolling finishing temperature is 790～840 ℃, pass deformation rate is 10～30%, overall compression ratio >=5;
(4) control coolingly, adopt water cooling system, opening cold temperature is 780～830 ℃, cooling rate >=15 ℃/s, eventually cold≤400 ℃, air cooling is to room temperature afterwards.
Compared with prior art, the present invention has but not only has the following advantages:
(1), containing expensive metal elements such as Ni, Mo, simultaneously, production technique is not without follow-up thermal treatment for designing chemical composition, and production cost is low.
(2) production technique adopts controlled rolling+Controlled cooling process, and without follow-up thermal treatment, production technique is simple, and the cycle is short, and efficiency is high.
(3) by above-mentioned design mix and rolling technology, the steel plate that can make is organized as ferrite+bainite, and yield strength Rp0.2 is 460～560MPa, tensile strength Rm is 700～790MPa, elongation after fracture >=14%, yield tensile ratio (Rp0.2/Rm)<0.7 ,-20 ℃ of ballistic work>80J.
(4) by above-mentioned designing chemical composition, its welding crack sensibility indices P cm≤0.20%, Plate Welding excellent property.
The accompanying drawing explanation
The microstructure picture that Fig. 1 is embodiment 1 light plate vertical section;
The microstructure picture that Fig. 2 is embodiment 2 light plate vertical sections;
The microstructure picture that Fig. 3 is embodiment 3 light plate vertical sections;
The microstructure picture that Fig. 4 is embodiment 4 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, but is not limited to this.
Embodiment 1
This steel (wt%) composed of the following components: C:0.075%, Si:0.28%, Mn:1.33%, P:0.0077%, S:0.0053%, Cr:0.31%, Nb:0.028%, B:0.0009%, all the other are Fe and inevitable impurity, the welding crack sensibility index:
Pcm＝C+Si/30+Mn/20+Cu/20+Cr/20+Mo/15+Ni/60+V/10+5B＝0.17％。
The mechanical property of steel plate is in Table 1, and its production technique comprises the steps:
(1) smelt, be cast into slab according to above-mentioned chemical component weight per-cent;
(2), to above-mentioned heating of plate blank, Heating temperature is 1180～1220 ℃, soaking time 2h;
(3) controlled rolling, roughing start rolling temperature≤1000 ℃, roughing finishing temperature >=970 ℃, pass deformation rate is 10～30%; 850～870 ℃ of finish rolling start rolling temperatures, the finish rolling finishing temperature is 790～840 ℃, pass deformation rate is 10～30%, overall compression ratio >=5, the thick 20mm of finished product;
(4) control coolingly, adopt the laminar flow water cooling system, opening cold temperature is 780～830 ℃, and cooling rate is 15～25 ℃/s, and cold eventually is 200～400 ℃, and air cooling is to room temperature afterwards.
Embodiment 2
This steel C:0.075% composed of the following components, Si:0.28%, Mn:1.33%, P:0.0077%, S:0.0053%, Cr:0.31%, Nb:0.028%, B:0.0009%, all the other are Fe and inevitable impurity, the welding crack sensibility index:
Pcm＝C+Si/30+Mn/20+Cu/20+Cr/20+Mo/15+Ni/60+V/10+5B＝0.17％。
The mechanical property of steel plate is in Table 1, and its production technique comprises the steps:
(1) smelt, be cast into slab according to above-mentioned chemical component weight per-cent;
(2), to above-mentioned heating of plate blank, Heating temperature is 1180～1220 ℃, soaking time 2h;
(3) controlled rolling, roughing start rolling temperature≤1000 ℃, roughing finishing temperature >=970 ℃, pass deformation rate is 10～30%; 850～870 ℃ of finish rolling start rolling temperatures, the finish rolling finishing temperature is 790～840 ℃, pass deformation rate is 10～30%, overall compression ratio >=5, the thick 20mm of finished product;
(4) control coolingly, adopt the laminar flow water cooling system, opening cold temperature is 780～830 ℃, cooling rate >=25 ℃/s, eventually cold≤200 ℃, air cooling is to room temperature afterwards.
Embodiment 3
This steel (wt%) composed of the following components: C:0.09%, Si:0.3%, Mn:1.50%, P:0.0089%, S:0.0079%, Cr:0.40%, Nb:0.03%, B:0.0008%, all the other are Fe and inevitable impurity, the welding crack sensibility index:
Pcm＝C+Si/30+Mn/20+Cu/20+Cr/20+Mo/15+Ni/60+V/10+5B＝0.20％。
The mechanical property of steel plate is in Table 1, and its production technique comprises the steps:
(1) smelt, be cast into slab according to above-mentioned chemical component weight per-cent.
(2), to above-mentioned heating of plate blank, Heating temperature is 1180～1220 ℃, soaking time 2h;
(3) controlled rolling, roughing start rolling temperature≤1000 ℃, roughing finishing temperature >=970 ℃, pass deformation rate is 10～30%; 850～870 ℃ of finish rolling start rolling temperatures, the finish rolling finishing temperature is 790～840 ℃, pass deformation rate is 10～30%, overall compression ratio >=5, the thick 20mm of finished product;
(4) control coolingly, adopt the laminar flow water cooling system, opening cold temperature is 780～830 ℃, cooling rate >=25 ℃/s, eventually cold≤200 ℃, air cooling is to room temperature afterwards.
Embodiment 4
This steel (wt%) composed of the following components: C:0.09%, Si:0.3%, Mn:1.50%, P:0.0089%, S:0.0079%, Cr:0.40%, Nb:0.03%, B:0.0008%, all the other are Fe and inevitable impurity, the welding crack sensibility index:
Pcm＝C+Si/30+Mn/20+Cu/20+Cr/20+Mo/15+Ni/60+V/10+5B＝0.20％。
The mechanical property of steel plate is in Table 1, and its production technique comprises the steps:
(1) smelt, be cast into slab according to above-mentioned chemical component weight per-cent.
(2), to above-mentioned heating of plate blank, Heating temperature is 1180～1220 ℃, soaking time 2h;
(3) controlled rolling, roughing start rolling temperature≤1000 ℃, roughing finishing temperature >=970 ℃, pass deformation rate is 10～30%; 850～870 ℃ of finish rolling start rolling temperatures, the finish rolling finishing temperature is 790～840 ℃, pass deformation rate is 10～30%, overall compression ratio >=5, the thick 30mm of finished product;
(4) control coolingly, adopt the laminar flow water cooling system, opening cold temperature is 780～830 ℃, cooling rate >=25 ℃/s, eventually cold≤200 ℃, air cooling is to room temperature afterwards.
Low yield strength ratio high-strength steel mechanical property in table 1 embodiment of the present invention 1-4
| Thickness of slab | Rp0.2/MPa | Rm/Mpa | A/％ | Yield tensile ratio | -20 ℃ of vertical Akv/J | |
| Embodiment 1 | 20mm | 456 | 707 | 24 | 0.645 | 238，230，221 |
| Embodiment 2 | 20mm | 487 | 719 | 23 | 0.677 | 202，209，171 |
| Embodiment 3 | 20mm | 546 | 785 | 14 | 0.696 | 89，94，82 |
| Embodiment 4 | 30mm | 527 | 762 | 18 | 0.692 | 94，119，82 |
Annotate: tension specimen adopts the bar-shaped sample that gauge length is φ 8 * 40mm; Charpy bar is of a size of 10 * 10 * 55mm, and test temperature is-20 ℃.
Claims (1)
1. the easy welding high-strength steel plate of low yield strength ratio, it is characterized in that described steel plate chemical constitution is by weight percentage: C0.07～0.09%, Si0.20～0.35%, Mn1.30～1.50%, P≤0.025%, S≤0.010%, Cr0.25～0.31%, Nb0.02～0.028%, B0.0005～0.0020%, all the other are Fe and inevitable impurity; The welding crack sensibility index of this steel plate
Pcm＝C+Si/30+Mn/20+Cu/20+Cr/20+Mo/15+Ni/60+V/10+5B≤0.20％;
According to following technique, prepared by this steel plate:
(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 1180～1220 ℃, is incubated 1.5～2.5h;
(3) in rolling process, roughing start rolling temperature≤1000 ℃, roughing finishing temperature >=970 ℃, pass deformation rate is 10～30%; 850～870 ℃ of finish rolling start rolling temperatures, the finish rolling finishing temperature is 790～840 ℃, pass deformation rate is 10～30%, overall compression ratio >=5;
(4) in refrigerating work procedure, adopt water cooling system, opening cold temperature is 780～830 ℃, cooling rate >=25 ℃/s, final cooling temperature≤400 ℃, air cooling is to room temperature afterwards;
The finished product thickness of described steel plate is 20mm, and this steel plate yield strength is 460～560MPa, and tensile strength is 700～790MPa, elongation after fracture >=14%, yield tensile ratio<0.7 ,-20 ℃ of ballistic work>80J.
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| CN109338215B (en) * | 2018-10-15 | 2020-10-30 | 江阴兴澄特种钢铁有限公司 | High-strength steel plate with thickness of 8-25 mm and low yield ratio for tank car and manufacturing method thereof |
| CN110669914B (en) * | 2019-09-30 | 2021-07-06 | 鞍钢股份有限公司 | High-strength steel for automobile axle housing for cold stamping and production method thereof |
| CN112210649B (en) * | 2020-09-25 | 2022-06-28 | 邯郸钢铁集团有限责任公司 | Flexible control method for yield ratio of high-strength steel |
| CN112501496B (en) * | 2020-10-20 | 2022-01-04 | 江苏省沙钢钢铁研究院有限公司 | On-line quenching type double-phase low-yield-ratio steel plate and production method thereof |
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