CN102605253B - Low-cost, high-strength and high-toughness steel plate and production technology thereof - Google Patents
Low-cost, high-strength and high-toughness steel plate and production technology thereof Download PDFInfo
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Abstract
The invention relates to a low-cost, high-strength and high-toughness steel plate and a production technology of the low-cost, high-strength and high-toughness steel plate; the low-cost, high-strength and high-toughness steel plate comprises the following chemical composition in percentage by mass: 0.13-0.17% of C, 0.15-0.35% of Si, 1.4-1.8% of Mn, less than or equal to 0.025% of P, less than or equal to 0.010% of S, 0.02-0.04% of Nb, 0.01-0.02% of Ti, 0.001-0.002% of B and the balance of Fe and unavoidable impurities. Due to the reasonable design of alloy composition, and the technology of controlling rolling and cooling and tempering, the thickness of the prepared finished product of the steel plate is larger than or equal to 15mm, a structure of the steel plate is tempered martensite, the yield strength is more than 800MPa, the tensile strength is more than 840MPa, the percentage elongation after fracture is more than 11%, and the ballistic work is more than 80J at the temperature of -60 DEG C. The low-cost, high-strength and high-toughness steel plate is less in alloy content, simple in production technology, short in period, low in cost and good in welding performance, cold bending property and plate type of the steel plate, thus being widely applied to the field of engineering machinery, coal mine machinery and the like.
Description
Technical field
The present invention relates to a kind of High Strength Steel Plate, particularly a kind of low-cost high-strength ductility steel plate and production technique thereof.
Background technology
High-strength steel is one of important structural timber, is applied to the fields such as engineering machinery, coal mine machinery, port and pier machinery, as excavator, shovel loader, lifting machine, Large Dump Truck etc.What the main components of engineering machinery was born is cyclic loading complicated and changeable, requires its construction material to have high yield strength and good impelling strength, cold formability and good weldability energy.Along with engineering machinery to maximization, the lightness development, requirement to above-mentioned performance is more outstanding, the performance level of high tensile steel plate for the ability and the efficiency that improve engineering machinery, increase the service life, alleviate equipment self-weight, reduce energy consumption, improve the class important role of complete machine.Along with society and expanding economy, Iron And Steel Industry is faced with the problems such as resource price is surging, the cost high profit is low, the demand speedup eases up.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 product of use properties, become the important directions of ferrous materials research.
The production technique of the high-strength steel that yield strength of 800 MPa is above is divided into modified and non-modified two kinds.Hardening and tempering process stability is better, relatively is 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 long, and cost is higher; Non-tempering process is to take the controlled rolling of heat engine tool as basis, adopts suitable process for cooling, fully utilizes various strengthening means, can decrease steel interalloy element addition, improve welding property.Owing to not needing to carry out complicated thermal treatment, thus the production cycle shorten dramatically, manufacturing cost also is minimized.
The manufacture patent of at present existing many high-strength high-toughness steel plates, from one-tenth, assign to, CN101451212A, CN101397641A, the patents such as CN101906594A, alloying element adds more, and what mostly adopt is Ni, Cr, Mo composition system, add precious metal as Ni, Mo etc., increased the production cost of steel;
From production technique, in most of patent, be all to adopt controlled rolling+off-line heat-treating methods, as CN101899630A, the patents such as CN101948987A adopt Quenching plus tempering process, the quenching technology had more makes the production cycle longer, and cost increases, and production efficiency is low.
Summary of the invention
The object of the invention is to propose a kind of low-cost high-strength ductility steel plate and production technique thereof.By reasonable interpolation alloying element, adopt controlled rolling and controlled cooling+tempering process, make its steel plate be organized as tempered martensite, yield strength>800MPa, tensile strength>840MPa, elongation after fracture>11% ,-60 ℃ of ballistic work>80J.
For achieving the above object, the present invention adopts following technical scheme:
Described steel plate chemical composition by weight percentage is composed as follows: C:0.13～0.17%, Si:0.15～0.35%, Mn:1.4～1.8%, P≤0.025%, S≤0.010%, Nb:0.02～0.04%, Ti:0.01～0.02%, B:0.001～0.002%, all the other are Fe and inevitable impurity.
Below to the selection concrete analysis explanation of the effect of contained component in low-cost high-strength ductility steel plate of the present invention and consumption thereof:
C:C is main strengthening element, is also the element that improves hardening capacity, plays solution strengthening effect in steel, so the content of C is unsuitable too low, but too high levels, the more difficult control of welding property and low-temperature flexibility.In the present invention, carbon content is chosen in 0.13～0.17%.
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 austenite stabilizer element, can improve the hardening capacity of steel, and play solution strengthening effect, therefore when the higher steel of production intensity, the content of Mn is unsuitable too low, and the relative low price of Mn, but excessive Mn makes the more difficult control of casting process, easy and the 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 1.40～1.80%.
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 non-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 0.02～0.04%.
The Main Function 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 easily causes Grain Boundary Segregation, impelling strength and the weldability of infringement steel plate, so the content of B is controlled at 0.001～0.002%.
P, S:P, S be as the harmful element 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%.
A kind of production technique of low-cost high-strength ductility steel plate, 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≤1020 ℃, roughing finishing temperature >=970 ℃, pass deformation rate is 10～30%; 860～880 ℃ of finish rolling start rolling temperatures, the finish rolling finishing temperature is 790～830 ℃, pass deformation rate is 10～30%, overall compression ratio >=5;
(4) control coolingly, adopt water cooling system, cooling rate >=40 ℃/s, final cooling temperature is 250～350 ℃;
(5) tempering, tempering temperature is 450～650 ℃, and soaking time is 1～2h, 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,, containing expensive metal elements such as Ni, Mo, V, production cost is not low for designing chemical composition, and production technique adopts controlled rolling and controlled cooling+tempering, and without reheating quench 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 made is organized as tempered martensite, yield strength>800MPa, tensile strength>840MPa, elongation after fracture>11% ,-60 ℃ of ballistic work>80J.
The accompanying drawing explanation
The microstructure picture that Fig. 1 is embodiment 2 light plate vertical sections;
The microstructure picture that Fig. 2 is embodiment 4 light plate vertical sections;
The microstructure picture that Fig. 3 is embodiment 6 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:0.15%, Si:0.27%, Mn:1.63%, P:0.0077%, S:0.0059%, Nb:0.03%, Ti:0.015%, B:0.0013%, all the other are Fe and inevitable impurity.
(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≤1020 ℃, roughing finishing temperature >=970 ℃, pass deformation rate is 10～30%; 860～880 ℃ of finish rolling start rolling temperatures, the finish rolling finishing temperature is 790～830 ℃, pass deformation rate is 10～30%, overall compression ratio >=5, the thick 15mm of finished product;
(4) control coolingly, adopt water cooling system, cooling rate >=40 ℃/s, final cooling temperature is 250～350 ℃;
(5) tempering, tempering temperature is 450 ℃, and soaking time is 1～2h, and air cooling is to room temperature afterwards.Obtain the mechanical property of steel plate in Table 1.
Embodiment 2
Embodiment is as embodiment 1, and wherein tempering process is: tempering temperature: 500 ℃, and soaking time: 1～2h.Obtain the mechanical property of steel plate in Table 1.
Embodiment 3
Embodiment is as embodiment 1, and wherein tempering process is: tempering temperature: 520 ℃, and soaking time: 1～2h.Obtain the mechanical property of steel plate in Table 1.
Embodiment 4
Embodiment is as embodiment 1, and wherein tempering process is: tempering temperature: 550 ℃, and soaking time: 1～2h.Obtain the mechanical property of steel plate in Table 1.
Embodiment 5
Embodiment is as embodiment 1, and wherein tempering process is: tempering temperature: 600 ℃, and soaking time: 1～2h.Obtain the mechanical property of steel plate in Table 1.
Embodiment 6
Embodiment is as embodiment 1, and wherein tempering process is: tempering temperature: 650 ℃, and soaking time: 1～2h.Obtain the mechanical property of steel plate in Table 1.
The low-cost high-strength ductility steel plate mechanical property that table 1 embodiment of the present invention 1-6 relates to
| Tempering temperature/℃ | R p02/MPa | R m/MPa | A/％ | -40 ℃ of vertical Akv/J | -60 ℃ of vertical Akv/J | |
| Embodiment 1 | 450 | 1081，1094 | 1155，1167 | 11.25，11.50 | 84，84，89 | 83，85，83 |
| Embodiment 2 | 500 | 909，909 | 934，935 | 14.85，13.25 | 132，109，130 | 92，99，106 |
| Embodiment 3 | 520 | 892，893 | 917，908 | 14.88，15.45 | 127，112，104 | 104，99，109 |
| Embodiment 4 | 550 | 877，872 | 910，906 | 15.50，15.00 | 113，101，116 | 81，95，92 |
| Embodiment 5 | 600 | 867，873 | 896，900 | 16.50，15.57 | 100，91，101 | 94，100，99 |
| Embodiment 6 | 650 | 823，812 | 845，843 | 15.50，17.65 | 120，97，107 | 96，95，96 |
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.
Claims (1)
1. a low-cost high-strength ductility steel plate, it is characterized in that, described steel plate chemical composition by weight percentage is composed as follows: C:0.13～0.17%, Si:0.15～0.35%, Mn:1.4～1.8%, P≤0.025%, S≤0.010%, Nb:0.02～0.04%, Ti:0.01～0.02%, B:0.001～0.002%, all the other are Fe and inevitable impurity.
According to following production 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≤1020 ℃, roughing finishing temperature >=970 ℃, pass deformation rate is 10～30%; 860～880 ℃ of finish rolling start rolling temperatures, the finish rolling finishing temperature is 790～830 ℃, pass deformation rate is 10～30%, overall compression ratio >=5;
(4) in refrigerating work procedure, adopt water cooling system, cooling rate >=40 ℃/s, 250～350 ℃ of final cooling temperatures, air cooling is to room temperature afterwards;
(5) tempering, tempering temperature is 450～650 ℃, and soaking time is 1～2h, and air cooling is to room temperature afterwards;
Obtained steel plate be organized as tempered martensite,
Yield strength>the 800MPa of this steel plate, tensile strength>840MPa, elongation after fracture>11% ,-60 ℃ of ballistic work>80J.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US9994926B2 (en) | 2012-07-31 | 2018-06-12 | Baoshan Iron & Steel Co., Ltd. | High-hardness, high-toughness, wear-resistant steel plate and manufacturing method thereof |
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| CN102876999B (en) * | 2012-10-18 | 2014-09-03 | 南京钢铁股份有限公司 | Steel plate for hardening and tempering type low temperature pressure vessel and method for producing steel plate |
| CN102899584B (en) * | 2012-10-26 | 2014-07-02 | 江苏省沙钢钢铁研究院有限公司 | Method for reducing ductile-brittle transition temperature of martensitic high strength steel |
| CN103628002B (en) * | 2013-12-05 | 2017-03-01 | 诸暨斯贝达机械有限公司 | Austenitic nonmagnetic steel and balance weight |
| CN113061815B (en) * | 2021-03-24 | 2022-04-26 | 宝武集团鄂城钢铁有限公司 | 800 MPa-grade quenched and tempered high-strength steel with stable full-section impact performance and production method thereof |
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