CN107760997A - Dual induced plastic high-strength steel and its manufacture method - Google Patents
Dual induced plastic high-strength steel and its manufacture method Download PDFInfo
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- CN107760997A CN107760997A CN201710886740.3A CN201710886740A CN107760997A CN 107760997 A CN107760997 A CN 107760997A CN 201710886740 A CN201710886740 A CN 201710886740A CN 107760997 A CN107760997 A CN 107760997A
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Abstract
The invention discloses a kind of dual induced plastic high-strength steel and its manufacture method, the steel chemical composition and its percentage by weight are as follows：C：0.41~0.45%, Si：0.10~0.13%, Mn：16.8~17.2%, Al：0.07~0.09%, Er：0.05~0.09%, Ce：0.02~0.04%, surplus is Fe and inevitable impurity.Rolled fine grained texture is obtained by controlled rolling and cooling technique in preparation method, after cold continuous rolling makes annealing treatment, completes main production, obtain austenite+micro martensite steel tissue, wherein, austenite percentage by volume is 93~98%, to ensure good TWIP effects.Steel mechanical property of the present invention is excellent, has the advantages that high-ductility, high intensity and low-repulsion, can meet automobile high energy absorption component materials requirement.
Description
Technical field
The present invention relates to metallurgical technology, in particular to a kind of dual induced plastic high-strength steel and its manufacture method.
Background technology
With the continuous development of automotive light weight technology, application percentage of the AHSS on automobile is significantly increased.Have
The transformation induced plasticity steel of single TRIP effects, intensity is high but ductility deficiency, the twin crystal inducing with single TWIP effects are moulded
Property Steel Properties are excellent but Mn too high levels (more than 25%), and industrialized production difficulty is big and cost is high.Meanwhile foregoing two classes steel group
Contain austenite in knitting, because of austenite category face-centered cubic lattice structure, the body-centered cubic point of the more traditional steel of each of which gap size
The each gap size of battle array is big, is smelting, hydrogen is easily inhaled in subsequent heat treatment and application process, causing manufactured auto parts and components to prolong
Slow phenomenon of rupture occurs.
Document 1 (Zhang Weina, Liu Zhenyu, the high manganese TWIP/TRIP steel progress of Wang Guodong and application [J] China engineering
Science, 2014,16 (1):High manganese TWIP/TRIP steel progress and applicable cases are described in 40-47.), describes crystal grain chi
The very little influence to TWIP steel deformation mechanisms, the evolution process that deformation twin changes with crystallite dimension is observed, summarize deformation and lure
The Evolution Mechanism of martensite and deformation induced twin is led, vanadium carbide (VC) precipitation particles has been sketched and high manganese TWIP/TRIP steel is prolonged
Fracture late and the influence of processing Temperature measurement, and the interaction mechanism of VC precipitation particles and deformation twin is inquired into；
Elaborate that double-roller rolling technique manufactures the newly net forming technical process of high manganese TWIP/TRIP steel strips and the differentiation machine of microscopic structure
Reason, and the prospect of engineer applied has been inquired into, the steel base chemical composition is Fe-25Mn-3Si-3Al-0.02C, adds vanadium (V)
Amount do not introduce.(such as Liu Rendong, Wang Xu, Guo Jinyu metastable austenites and microalloy element are to the high-strength automobile of cold rolling for document 2
Influence [J] Anshan iron and steel plant technologies of Steel Properties, 2014, (6):Metastable austenite is described in 1-7.) and microalloy element (Nb, V) is right
The influence of the high-strength automobile Steel Properties of the cold rollings such as TRIP steel, TWIP steel and Q＆P steel, it is sub- that it mainly includes the high-strength automobile steel of regulation and control cold rolling
The component system and continuous annealing process of steady austenite structure, metastable austenite tissue signature and measuring method, and its to high-strength
Influences of performance such as automobile steel strength and ductility product, stress strain curve shape etc.；Microalloy element (V, Nb) is also described to cold rolling height simultaneously
The influence of the personalized performances such as strong automobile steel formability, strength grade, delayed fracture；The steel Exemplary chemical composition is Fe-
21.6Mn-0.63C-0.87V, select vanadium carbide (VC) precipitation particles to suppress hydrogen diffusion as hydrogen trap, improve delayed fracture, V
Element significantly improves intensity, but its elongation percentage have impact on its stamping formabilily less than 30%.Adopted in two above document
High manganese TWIP/TRIP steel delayed fracture phenomenon is controlled with vanadium carbide (VC) precipitation particles, V addition result in production work
Skill difficulty greatly increases, meanwhile, adverse effect is generated to mechanical property, such as plasticity decline, cost of material improves.Therefore, it is
Meet high-end automobile making material requirements, develop the high-strength steel with the high comprehensive performance such as high-ductility and lightweight become for
Technical problem urgently to be resolved hurrily.
The content of the invention
Present invention aim to provide a kind of dual induced plastic high-strength steel and its manufacture method, the steel mechanical property
It is excellent, there is high-ductility, high intensity and low-repulsion, automobile high energy absorption component materials requirement can be met.
To achieve the above object, the technical solution adopted by the present invention is：A kind of dual induced plastic high-strength steel, its feature exist
In：The steel chemical composition and its percentage by weight are as follows：C：0.41~0.45%, Si：0.10~0.13%, Mn：16.8~
17.2%, Al：0.07~0.09%, Er：0.05~0.09%, Ce：0.02~0.04%, surplus be Fe and inevitably it is miscellaneous
Matter.
Further, the steel chemical composition and its percentage by weight are as follows：C：0.42~0.45%, Si：0.11~
0.13%, Mn：16.92~17.2%, Al：0.07~0.09%, Er：0.06~0.08%, Ce：0.02~0.04%, surplus
For Fe and inevitable impurity.
Further, the steel chemical composition and its percentage by weight are as follows：C：0.44~0.45%, Si：0.11~
0.13%, Mn：16.92~17.16%, Al：0.08~0.09%, Er：0.06~0.07%, Ce：0.03~0.04%, surplus
For Fe and inevitable impurity.
A kind of manufacture method of above-mentioned dual induced plastic high-strength steel, including smelt, application of vacuum, continuous casting, heating, heat
To roll, batch, pickling, cold continuous rolling and annealing steps, in the hot-rolled step, it is 1048~1077 DEG C to control hot rolling roughing temperature,
Finishing temperature is 921~929 DEG C；In the cold continuous rolling, cold-rolling of steel plate original thickness is 2.8~4.0mm, finished product thickness 1.4
~2.0mm；In the annealing steps, it is 830~839 DEG C to control holding temperature, then rapid cooling, in 360~390 DEG C of Ageing Treatments
Afterwards, it is cooled to room temperature.
Further, in the annealing steps, it is 836~838 DEG C to control holding temperature, and soaking time is 2~7 seconds, so
Afterwards with 38~42 DEG C/s cooling velocity rapid cooling.
Further, in the cold continuous rolling step, cold rolling reduction ratio is 48~52%.
Further, in the vacuum processing step, vacuum is 110~120Pa, [H] in molten steel after application of vacuum≤
1.5ppm。
Further, in the continuous casting step, pouring temperature is 1466~1496 DEG C.
Further, in the heating stepses, heating-up temperature is 1192~1199 DEG C.
Further, described to batch in step, it is 678~685 DEG C to control coiling temperature.
It is as follows to the chemical composition analysis of steel of the present invention：
C：C is solution strengthening element, but C content is too high, is unfavorable for ensureing the forming property of material, too low to be unfavorable for intensity
With the stability of austenite structure, therefore, C content is defined to 0.41~0.45% by the present invention.
Si：Si element solid solutions improve the intensity of steel in ferrite, meanwhile, Si suppresses the life of carbide in microstructure
Into therefore, Si contents are defined to 0.10~0.13% by the present invention.
Mn：Mn elements are conventional Strengthening and Toughening elements, meanwhile, austenite phase field can be expanded, increase the steady of austenite structure
It is qualitative, but Mn contents are too high, on the one hand increase cost, on the other hand increase the quenching degree of steel, welding tissue hardened layer is occurred
Crackle weld dimensions crack sensitivity is caused to increase, Mn contents are too low, are unfavorable for stabilization of austenite, therefore, this hair
It is bright that Mn contents are defined to 16.8~17.2%.
Al：Al mainly plays deoxidation in the present invention, meanwhile, stacking fault energy is balanced, therefore, the present invention limits Al content
For 0.07~0.09%.
Er：Er is a kind of rare earth element, suppresses the suction of hydrogen in the present invention, increases hydrogen trap, beneficial to anti-delayed fracture
Property, increase heat resistance, platability and welding performance, and high temperature austenite can be prevented too to grow up, there is extremely strong refinement
Crystal grain is acted on, and Er contents are defined to 0.05~0.09% by the present invention.
Ce：Ce is a kind of rare earth element, in the present invention, suppresses the suction of hydrogen, increases hydrogen trap, and it is disconnected to be advantageous to anti-delay
Fragility, and high temperature austenite can be prevented too to grow up, there is extremely strong Grain refinement, reduce austenite stacking fault energy,
Er contents are defined to 0.02~0.04% by the present invention.
The manufacture method of steel of the present invention is analyzed as follows：
Using converter smelting molten steel, rolled fine grained texture is obtained by controlled rolling and cooling technique, moved back through cold continuous rolling
After fire processing, main production is completed, obtains austenite+micro martensite steel tissue, wherein, austenite percentage by volume exists
93~98%, to ensure good TWIP (twin crystal inducing plasticity) effect.
Compared with prior art, the present invention has advantages below：
First, the present invention is aided with suction and formation that appropriate rare earth element er and Ce member usually suppresses hydrogen using low Si, Al
Hydrogen trap, hot rolling or the high-strength product made from steel of cold rolling are manufactured, also including hot dip galvanized product, to reach required comprehensive mechanical
Can, and avoid the generation of material delayed fracture phenomenon in application process, ensure invention material it is good can zinc-plated performance, nothing
Plating leakage phenomenon.
Second, material of the present invention contains austenite+micro martensite, wherein, austenite percentage by volume 93%~
In the range of 98%, in the range of 11~12 grades of grain size, the high intensity and good mechanical property, yield strength that ensure that material reach
440~459MPa, tensile strength is up to 980~1080MPa, elongation >=58%, and strain hardening exponent (n values) is 0.43~
0.55。
Third, steel of the present invention compared with existing generic other high-strength steel, avoids delayed fracture phenomenon and good
Zinc-plated performance, significantly reduces manganese content, greatly reduces manufacturing cost.
Fourth, steel plate of the present invention has high intensity, high-ductility, low-repulsion, good decay resistance and zinc-plated performance,
Occur without plating leakage phenomenon and delayed fracture phenomenon.Material of the present invention is used to manufacture automobile collision preventing part and complex deformation structural member,
Welded Joints carry out comprehensive mechanical property test after welding, and the comprehensive mechanical property and impact flexibility of welding point are good, weldering
Produced after connecing without cold crack and low-temperature cracks, solderability is good.Steel of the present invention solves the high-strength hardness of steel height of existing same level and moulded
Property difference the problem of, in the case where steel plate is thinned, meet automobile making complex partses and anticollision part and heat-resistant part
It is required that provide a kind of ideal material for high-end automobile making.
Brief description of the drawings
Fig. 1 is the metallurgical structure figure of the gained high-strength steel of embodiment 2.
Embodiment
With reference to specific embodiment, the present invention is described in further detail, is easy to more clearly understand the present invention,
But they do not form to the present invention and limited.
Embodiment 1~6
The chemical composition and its percentage by weight of a kind of dual induced plastic high-strength steel are as shown in table 1；The steel making method
Comprise the following steps：
1) pneumatic steelmaking：Steel is tested by industrial converter top bottom blowing, it is contemplated that meets the requirement of this steel grade and big life
Production needs, and sets tapping target temperature as 1800 DEG C or so.
2) application of vacuum：110~120Pa of vacuum, pure vacuum processing time target：After 10min, RH processing terminate, steel
Water [H]≤1.5ppm.
3) continuous casting：Molding casting measure is used during the continuous casting, big or middle bag is using long nozzle argon envelope molding casting, middle bag
Steel circulation road argon seals, and uses bag covering slag in magnesian and alkalescence, crystallizer heat insulation-type covering slag；Pouring temperature is 1466
~1496 DEG C, it can guarantee that molten steel is continuously smoothly poured into a mould, crystallizer cooling water accelerates rapid cooling, makes strand to less than 925 DEG C.
4) heating of plate blank：The steel plate of the present invention contains high manganese and rare earth element, and heating-up temperature is maintained at 1192~1199 DEG C
In the range of.
5) hot rolling：Roughing temperature control is designed at 921~929 DEG C in 1048~1077 DEG C of scopes, finishing temperature during hot rolling
In the range of, the uniform appropriate crystallite dimension of steel plate austenite can ensured, obtain the hot rolled steel plate that thickness specification is 3.6mm.
6) batch：Coiler plate temperature design is to ensure certain crystallite dimension, together in the range of 678~685 DEG C
When, reduce the follow-up cold rolling resistance of deformation of steel plate.
7) pickling+cold continuous rolling：The hot rolled steel plate that thickness specification is 3.6mm is cold rolled to the thick thin plates of 1.8mm.
8) continuous annealing：Continuous annealing is the critical process that the present invention obtains suitable austenite structure structure, its technique
Pattern is：Holding temperature is controlled at 830~839 DEG C, and soaking time 2~7 seconds is excellent then with 38~42 DEG C/s cooling velocity
Choosing is with 40 DEG C/s rapid cooling, and (timeliness of this temperature section is one section of isothermal processes in continuous annealing furnace after 360~390 DEG C of timeliness
Process), it is cooled to room temperature.
9) it is smooth：The thickness and precision of product directly affects part processing precision and processing characteristics, in addition also to ensure plate shape,
Suitably carry out smooth.
The main technologic parameters value being related in the steel making processes of embodiment 1~6 is as shown in table 2 below.
Integration test and analysis, including tensile property test, anti-delayed fracture have been carried out to steel made from embodiment 1~6
Property and corrosion resistance and rebound performance experiment, empirical tests find embodiment 1~6 made from steel there is high-strength high-plasticity and tool
There are a low resilience and good decay resistance, zinc-plated function admirable, the features such as no plating leakage phenomenon, place 360~480 days, without prolonging
Slow phenomenon of rupture, concrete outcome are as shown in table 3 below.The metallurgical structure of the gained high-strength steel of embodiment 2 is as shown in figure 1, crystal grain
Spend for 11~12 grades, crystal grain is uniform, ensure that the high intensity of material and good mechanical property.
Table 1 (wt%)
Table 2
Table 3
Claims (10)
- A kind of 1. dual induced plastic high-strength steel, it is characterised in that：The steel chemical composition and its percentage by weight are as follows：C：0.41 ~0.45%, Si：0.10~0.13%, Mn：16.8~17.2%, Al：0.07~0.09%, Er：0.05~0.09%, Ce： 0.02~0.04%, surplus is Fe and inevitable impurity.
- 2. dual induced plastic high-strength steel according to claim 1, it is characterised in that：The steel chemical composition and its weight percent Than as follows：C：0.42~0.45%, Si：0.11~0.13%, Mn：16.92~17.2%, Al：0.07~0.09%, Er： 0.06~0.08%, Ce：0.02~0.04%, surplus is Fe and inevitable impurity.
- 3. dual induced plastic high-strength steel according to claim 1, it is characterised in that：The steel chemical composition and its weight percent Than as follows：C：0.44~0.45%, Si：0.11~0.13%, Mn：16.92~17.16%, Al：0.08~0.09%, Er： 0.06~0.07%, Ce：0.03~0.04%, surplus is Fe and inevitable impurity.
- 4. the manufacture method of dual induced plastic high-strength steel described in a kind of claim 1, including smelt, application of vacuum, continuous casting, add Heat, hot rolling, batch, pickling, cold continuous rolling and annealing steps, it is characterised in that：In the hot-rolled step, hot rolling roughing temperature is controlled For 1048~1077 DEG C, finishing temperature is 921~929 DEG C；In the cold continuous rolling, cold-rolling of steel plate original thickness be 2.8~ 4.0mm, finished product thickness are 1.4~2.0mm；In the annealing steps, it is 830~839 DEG C to control holding temperature, then rapid cooling, After 360~390 DEG C of Ageing Treatments, room temperature is cooled to.
- 5. the manufacture method of dual induced plastic high-strength steel according to claim 4, it is characterised in that：The annealing steps In, it is 836~838 DEG C to control holding temperature, and soaking time is 2~7 seconds, then with 38~42 DEG C/s cooling velocity rapid cooling.
- 6. the manufacture method of the dual induced plastic high-strength steel according to claim 4 or 5, it is characterised in that：The cold company Roll in step, cold rolling reduction ratio is 48~52%.
- 7. the manufacture method of the dual induced plastic high-strength steel according to claim 4 or 5, it is characterised in that：The vacuum In processing step, vacuum is 110~120Pa, [H]≤1.5ppm in molten steel after application of vacuum.
- 8. the manufacture method of the dual induced plastic high-strength steel according to claim 4 or 5, it is characterised in that：The continuous casting In step, pouring temperature is 1466~1496 DEG C.
- 9. the manufacture method of the dual induced plastic high-strength steel according to claim 4 or 5, it is characterised in that：The heating In step, heating-up temperature is 1192~1199 DEG C.
- 10. the manufacture method of the dual induced plastic high-strength steel according to claim 4 or 5, it is characterised in that：It is described to batch In step, it is 678~685 DEG C to control coiling temperature.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111363970A (en) * | 2020-03-30 | 2020-07-03 | 南京钢铁股份有限公司 | Nickel-free LPG (liquefied Petroleum gas) steel plate for ship and manufacturing method thereof |
| CN112474822A (en) * | 2020-12-10 | 2021-03-12 | 安阳钢铁股份有限公司 | Cold continuous rolling production process for medium carbon steel |
| CN113930659A (en) * | 2021-10-15 | 2022-01-14 | 江西理工大学 | High-strength high-plasticity TWIP steel and preparation method thereof |
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| CN101928876A (en) * | 2009-06-22 | 2010-12-29 | 鞍钢股份有限公司 | TRIP/TWIP high-strength plastic automobile steel with excellent processability and preparation method thereof |
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| CN101649412A (en) * | 2008-08-15 | 2010-02-17 | 宝山钢铁股份有限公司 | Hadifield steel with excellent mechanical property and manufacturing method thereof |
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Cited By (3)
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| CN111363970A (en) * | 2020-03-30 | 2020-07-03 | 南京钢铁股份有限公司 | Nickel-free LPG (liquefied Petroleum gas) steel plate for ship and manufacturing method thereof |
| CN112474822A (en) * | 2020-12-10 | 2021-03-12 | 安阳钢铁股份有限公司 | Cold continuous rolling production process for medium carbon steel |
| CN113930659A (en) * | 2021-10-15 | 2022-01-14 | 江西理工大学 | High-strength high-plasticity TWIP steel and preparation method thereof |
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