CN103147000A - Polygonal ferrite-acicular ferrite two-phase steel plate/belt and production method thereof - Google Patents
Polygonal ferrite-acicular ferrite two-phase steel plate/belt and production method thereof Download PDFInfo
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Abstract
The invention discloses a polygonal ferrite-acicular ferrite two-phase steel plate/belt and a production method thereof and belongs to the technical field of high-strength low-alloy steel. The low-alloy steel comprises the following chemical components in percentage by weight: 0.03%-0.12wt% of C, 0.10wt%-1.5wt% of Si, 0.5wt%-2.1wt% of Mn, not more than 0.02wt% of P, not more than 0.01wt% of S, 0.02wt%-0.1wt% of Nb, 0.05wt%-0.45wt% of Mo, the balance being Fe and inevitable impurities. A few alloy elements including 0-0.4wt% of Cu, 0-0.5wt% of Ni, 0-0.5wt% of Cr and the like are added in the low-alloy steel. The production process comprises the following steps of: steel-making, continuous-casting, re-heating, rough-rolling, finish-rolling, cooling, relaxing and preserving the heat and quickly cooling. The polygonal ferrite-acicular ferrite two-phase steel plate/belt has the advantages of high toughness and plasticity in addition to high strength level, and is applicable to the vehicle plate filed and the pipeline steel filed with high requirements on strength, plasticity and toughness.
Description
Technical field
The invention belongs to the high-strength low-alloy steel technical field, be specifically related to a kind of polygonal ferrite+acicular ferrite dual phase sheet steel/band and production method, this steel plate/belt has duplex structure, close grain.
Technical background
The dual phase steel in low alloy steel field is often referred to ferrito-martensite dual phase steel or dual phase steel of ferrite and bainite, can be by soft steel or low alloy steel through critical zone processing or controlled rolling and obtain.This class steel has become because having the good combination of high strength and high ductility the novel steel grade that a kind of intensity is high, plasticity is good, is successfully used in automobile making industry and pipeline transportation industry etc.
But the ferrito-martensite dual phase steel is restricted because of the relatively poor use in welding structural element of welding property; Dual phase steel of ferrite and bainite has obtained generally using in large-deformation-resistance pipeline steel along with the development of pipeline manufacturing in recent years, but dual phase steel of ferrite and bainite impelling strength is relatively poor and the softening series of problems that waits of weld seam never is resolved.Along with petering out of land oil Sweet natural gas, new energy extraction is especially area, deep-sea extension to the ocean.Seabed rugged environment condition has proposed the specification of quality stricter than continental line to subsea pipeline, as thick specification, high tenacity, resistance to deformation etc., requires tubing must have high tenacity, low yield strength ratio, antifatigue, the poor characteristics such as little of vertical lateral performance.If still adopt the technological line of dual phase steel of ferrite and bainite, on the thick steel plates thick section, tissue, performance uniformity will be difficult to be guaranteed, and the problem of impelling strength and fracture toughness property also is difficult to solve simultaneously." Ultra-fine Grained polygonal ferrite+acicular ferrite " of the present invention duplex structure can guarantee thick specification Pipeline Steel Plate when having high-strong toughness, still has high deformation performance, good welding and corrosion resistance nature concurrently.Realized that thick specification pipe line steel is strong, tough, the rational Match of plasticity.
The control of the microstructure especially rational Match of fine ferrite grain and acicular ferrite two-phase ratio and the control of microcosmic substructure is to guarantee that " fine ferrite grain+acicular ferrite " duplex structure's steel plate or steel band have the key of excellent mechanical property." steel smelting-continuous casting-reheating-roughing-finish rolling-(cooling)-relaxation (insulation)-fast is cooling " of the present invention complete steel plate/steel band manufacturing process route, especially the omnidistance super-refinement of austenite is controlled and fine ferrite grain phase transformation-quick Cooling Control Technology, has realized the on-line Control of " thin brilliant polygonal ferrite+acicular ferrite " duplex structure.Obtained to have high-strong toughness, high deformability, anisotropy are little, the novel duplex structure steel plate/steel band of good welding performance.
Summary of the invention
The object of the present invention is to provide a kind of polygonal ferrite+acicular ferrite dual phase sheet steel/band and production method, this steel plate/belt has duplex structure, close grain; Can be used for making the structural parts such as automotive wheel that strong plasticity is had relatively high expectations reaches the production fields such as pipe line steel strong, tough, that plasticity is had relatively high expectations.
Dual phase steel chemical component weight per-cent of the present invention is: C: 0.03～0.10 wt%, Si: 0.10～1.5 wt%, Mn: 0.5～2.1 wt%, P :≤0.02 wt%, S :≤0.01 wt%, Nb: 0.02～0.1 wt%, Mo:0.05～0.45 wt%, and surplus is Fe and inevitable assorted;Types of organization is thin brilliant polygonal ferrite+acicular ferrite.
The present invention mainly is applicable to the C-Mn-Nb-Mo steel, according to the specific performance requirement, can also suitably add a small amount of Cu:0～alloying elements such as 0.4 wt%, Ni:0～0.5 wt%, Cr:0～0.5wt%, V:0～0.06wt%.
The production method of " thin brilliant polygonal ferrite+acicular ferrite " of the present invention duplex structure's steel plate/steel band, manufacturing process comprise that steel smelting-continuous casting-reheat-roughing-finish rolling-(cooling)-relaxation (insulation)-fast is cooling; The technical parameter of controlling in steel plate/steel band manufacturing process is as follows:
In the production method of duplex structure of the present invention steel plate: non-recrystallization district deflection 〉=50%, 850 ℃～750 ℃ of finishing temperatures are rolled rear first air cooling to 660-760 ℃, then are chilled to 450-580 ℃ with the cooling rate of 2～30 ℃/s.
In the production method of duplex structure of the present invention steel band: non-recrystallization district deflection 〉=50%, 850 ℃～750 ℃ of finishing temperatures, roll rear 660 ℃ ~ 750 ℃ a certain temperature in interval that first are cooled fast to, air cooling 5～40S, the cooling rate with 2～30 ℃/s is chilled to 450-580 ℃ at last.
Duplex structure of the present invention steel plate/steel band, its types of organization is " thin brilliant polygonal ferrite+acicular ferrite ".
The effect of duplex structure of the present invention steel plate/steel band main chemical compositions is as follows:
C:C main mode with solid solution in steel exists, and to improve austenitic hardening capacity, obtain bainite ferrite tissue and a certain amount of MA island structure, but C content is too much unsuitable, otherwise can affects welding property.Best C content range is 0.05%～0.07%.
Si:Si is solution strengthening element commonly used in dual phase steel, can the reinforced ferrite matrix, and dwindle the two-phase difference of hardness, thereby improve the stretch flanging performance of material; In addition, Si is non-carbide forming element, can suppress cementite and form, and hinders pearlitic transformation, thereby enlarges the ferrite transformation temperature range, enlarges rolling and the cooling temperature window, is conducive to the realization of production technique.At present, have the content of Si in the dual phase steel composition now by weight percentage usually more than 0.20%, but Si content height can cause the quality control on the surface difficulty of steel to strengthen, simultaneously, the plating poor performance of steel plate.The Si content of described hot-rolled dual-phase steel in 0.10～1.50% scope, has guaranteed plate surface quality and plating performance by weight percentage.
Mn:Mn can exist with solid solution condition, also can enter to replace a part of Fe atom in cementite, plays solution strengthening effect, can also form sulfide.The Mn element is assembled in austenite, can improve stabilization of austenite.So, Zui Hao＞=0.5% of Mn content in the present invention.
Nb: the Nb of solid solution can significantly improve austenite recrystallization temperature, increases non-recrystallization district deflection, and the niobium carbonitrides particle of separating out can increase ferrite forming core point, and stops the proeutectoid ferrite grain growth, makes the ferrite crystal grain that obtains tiny.But in steel, Nb content is difficult for too high, too high Nb and can suppresses deformation induced ferrite transformation, and the rolling load of low temperature rolling is increased, and is unfavorable for process implementing.In the present invention, be mainly to utilize Nb to come the grain-size of refinement polygonal ferrite, so the add-on of Nb needn't be too high.Add-on gets final product 0.03%～0.06%.
Mo:Mo can obviously improve austenitic stability in steel, suppress polygonal ferrite and generate, and forms single acicular ferrite structure.In " thin brilliant polygonal ferrite+acicular ferrite " type dual phase steel, wish the brilliant polygonal ferrite of parts of fine and first generate, so Mo≤0.25wt% is advisable.
Cu, Cr, Ni: very strong solution strengthening effect is arranged, and be all the austenite stable element, improve hardening capacity, promote bainite to generate, can also improve the corrosion resistance of material simultaneously.
P:P also can suppress separating out of cementite in steel, ferrite is had significant solution strengthening effect.But the P too high levels can affect the use properties of steel, can produce cold short effect as steel at low temperatures.
S:S is combined with Mn in steel and is formed MnS, reduces the effective content of Mn, reduces simultaneously the anti-HIC ability of steel, and therefore, the content of S in steel is controlled more low better.
The present invention can suitably adjust chemical composition and finishing temperature, steel plate air cooling end temp or steel band air cooling time etc. according to concrete strong plasticity and toughness requirement, obtains optimized duplex structure proportioning, satisfies different use properties requirements.
A kind of " thin brilliant polygonal ferrite+acicular ferrite " of the present invention duplex structure, its mechanical performance index is as follows: yield strength 300～750MPa, tensile strength 450MPa～900MPa, unit elongation 20～40%, uniform elongation 〉=8%, yield tensile ratio≤0.85, full-scale impelling strength (20 ℃) 〉=200J has good comprehensive mechanical property.
Advantage of the present invention:
(1) owing to being only to have added alloy element Nb and a small amount of Mo in steel at simple C-Mn, with low cost;
(2) a kind of " thin brilliant polygonal ferrite+acicular ferrite " of the present invention duplex structure and production method thereof, guaranteed that steel plate/steel band is when having higher intensity levels, have larger plastic deformation ability and higher low-temperature flexibility level concurrently, make steel plate/steel band have simultaneously excellent strong, tough, plasticity coupling.
Description of drawings
Fig. 1 is the microtexture of 37mm Plate Steel thick section 1/4th positions.
Embodiment
Embodiment 1
" thin brilliant polygonal ferrite+acicular ferrite " duplex structure's steel plate, its constitutive material is counted according to mass percent: C:0.05wt%, Si:0.3 wt%, Mn:1.5wt%, Nb:0.045 wt%, Mo:0.12 wt%, P:0.01 wt%, S:0.0020 wt%, surplus is Fe and inevitable impurity, becomes the 300mm strand through converter smelting, continuous casting.
Strand is through 1200 ℃ of heating, and holding-zone is more than 2 hours, 1100 ℃ of start rolling temperatures, and 980 ℃ of roughing finishing temperatures, at this temperature, cumulative deformation 32%, workpiece thickness 140mm, 930 ℃ are advanced finish rolling, 790 ℃ of finishing temperatures, finish rolling outlet steel plate thickness 37mm; After air cooling to 740 ℃, beginning is cooled to 500 ℃ with the cooling rate of 15 ℃/S, and last air cooling is to room temperature.
After testing, steel plate microstructure type is " thin brilliant polygonal ferrite+acicular ferrite ", and wherein the polygonal ferrite volume fraction 24%, acicular ferrite volume fraction 76%, polygonal ferrite grain-size 4.0um.As shown in Figure 1.
The every mechanical property of steel plate is as shown in table 1.Its every mechanical performance index satisfies SYMS480F and SYMS480P and other relevant criterion requirements in the DNV standard fully.
The mechanical property of table 1 embodiment 1 steel plate
Embodiment 2 and embodiment 3
" thin brilliant polygonal ferrite+acicular ferrite " duplex structure's hot rolled strip, its constitutive material is counted according to mass percent: C:0.08wt%, Si:0.6 wt%, Mn:1.4wt%, Nb:0.03 wt%, Mo:0.1 wt%, P:0.01 wt%, S:0.0020 wt%, surplus is Fe and inevitable impurity, becomes the 200mm strand through converter smelting, continuous casting.
Strand is through 1200 ℃ of heating, and holding-zone is more than 2 hours, 1100 ℃ of start rolling temperatures, and 1020 ℃ of roughing finishing temperatures, 920 ℃ are advanced finish rolling, 820 ℃ of finishing temperatures, finish rolling outlet strip steel thickness 6mm; Steel band goes out first to accelerate after milling train to be cooled to 710 ℃, then respectively after air cooling 8S and 15S beginning be cooled to 500 ℃ with the cooling rate of 15 ℃/S and batch.
After testing, steel band microstructure type is " thin brilliant polygonal ferrite+acicular ferrite ", and concrete statistic data sees Table 2.
Microstructure statistics under two kinds of air cooling times of table 2
The every mechanical property of steel band is as shown in table 3.Its every mechanical performance index satisfies 590 grades of wheel-use steel material band standard-requireds fully.
The mechanical property of table 3 embodiment 2,3 steel bands
Embodiment 4
" thin brilliant polygonal ferrite+acicular ferrite " duplex structure's steel band, its constitutive material is counted according to mass percent: C:0.065wt%, Si:0.3 wt%, Mn:1.9wt%, Nb:0.07 wt%, Mo:0.26 wt%, P:0.01 wt%, S:0.0020 wt%, surplus is Fe and inevitable impurity, becomes the 300mm strand through converter smelting, continuous casting.
Strand is through 1200 ℃ of heating, and holding-zone is more than 2 hours, 1100 ℃ of start rolling temperatures, and 980 ℃ of roughing finishing temperatures, at this temperature, deflection 30%, workpiece thickness 60mm, 950 ℃ are advanced finish rolling, 790 ℃ of finishing temperatures, finish rolling outlet steel plate thickness 15.3mm; After air cooling to 750 ℃, beginning is cooled to 500 ℃ with the cooling rate of 15 ℃/S and batches.
After testing, steel band microstructure type is " thin brilliant polygonal ferrite+acicular ferrite ", and wherein the polygonal ferrite volume fraction 24%, acicular ferrite volume fraction 76%, polygonal ferrite grain-size 3.0um.
The every mechanical property of steel plate is as shown in table 4.Its every mechanical performance index satisfies SYMS480F and SYMS480P and other relevant criterion requirements in the DNV standard fully.
The mechanical property of table 4 embodiment 4 steel bands
Embodiment 5
" thin brilliant polygonal ferrite+acicular ferrite " duplex structure's hot rolled strip, its constitutive material is counted according to mass percent: C:0.1wt%, Si:0.6 wt%, Mn:1.6wt%, Nb:0.06 wt%, Mo:0.28 wt%, P:0.01 wt%, S:0.0020 wt%, surplus is Fe and inevitable impurity, becomes the 200mm strand through converter smelting, continuous casting.
Strand is through 1200 ℃ of heating, and holding-zone is more than 2 hours, 1100 ℃ of start rolling temperatures, and 1020 ℃ of roughing finishing temperatures, 920 ℃ are advanced finish rolling, 820 ℃ of finishing temperatures, finish rolling outlet strip steel thickness 6mm; Steel band goes out first to accelerate after milling train to be cooled to 710 ℃, and then after air cooling 8S, beginning is cooled to 500 ℃ with the cooling rate of 15 ℃/S and batches.
After testing, steel band microstructure type is " thin brilliant polygonal ferrite+acicular ferrite ", and concrete statistic data sees Table 5.
Microstructure statistics under two kinds of air cooling times of table 5
The every mechanical property of steel band is as shown in table 6.Its every mechanical performance index satisfies 590 grades of wheel-use steel material band standard-requireds fully.
The mechanical property of table 6 embodiment 5 steel bands
Claims (3)
1. polygonal ferrite+acicular ferrite dual phase sheet steel/band, it is characterized in that: the chemical component weight per-cent of this dual phase sheet steel/band is: C: 0.03～0.10 %, Si: 0.10～1.5 %, Mn: 0.5～2.1 %, P :≤0.02 %, S :≤0.01 %, Nb: 0.02～0.1 %, Mo:0.05～0.45 %, and surplus is Fe and inevitable impurity; Types of organization is thin brilliant polygonal ferrite+acicular ferrite.
2. dual phase sheet steel according to claim 1/band, is characterized in that: separately add Cu:0～0.4 wt%, Ni:0～0.5 wt%, Cr:0～0.5wt%.
3. the production method of dual phase sheet steel claimed in claim 1/band, technique comprises: steel smelting-continuous casting-reheating-roughing-finish rolling-cooling-relaxation insulation-cooling fast; It is characterized in that, the technical parameter of controlling in technique is as follows:
Dual phase sheet steel: non-recrystallization district deflection 〉=50%, 850 ℃～750 ℃ of finishing temperatures are rolled rear first air cooling to 660-760 ℃, then are chilled to 450-580 ℃ with the cooling rate of 2～30 ℃/s;
The two-phase steel band: non-recrystallization district deflection 〉=50%, 850 ℃～750 ℃ of finishing temperatures are rolled rear 660 ℃ ~ 750 ℃ a certain temperature in interval that first are cooled fast to, air cooling 5～40S, the cooling rate with 2～30 ℃/s is chilled to 450-580 ℃ at last.
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| CN103556048A (en) * | 2013-10-24 | 2014-02-05 | 钢铁研究总院 | Two-phase automobile steel plate with low yield-strength ratio and high strength and production method of two-phase automobile steel plate |
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| CN111154963A (en) * | 2019-12-26 | 2020-05-15 | 钢铁研究总院 | Welding heat influence region-resistant softened submarine pipeline steel and preparation method thereof |
| CN113278880A (en) * | 2021-04-15 | 2021-08-20 | 邯郸钢铁集团有限责任公司 | Low-yield-ratio and low-hardness submarine pipeline steel L485MO and production method thereof |
| CN115341154A (en) * | 2022-09-21 | 2022-11-15 | 南通瑞泰针业有限公司 | High-toughness and high-strength sewing machine needle |
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