CN105695870A - thick hot rolled sheet steel with 450MPa grade yield strength and manufacturing method thereof - Google Patents
thick hot rolled sheet steel with 450MPa grade yield strength and manufacturing method thereof Download PDFInfo
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Abstract
The invention relates to a thick hot rolled sheet steel with 450MPa grade yield strength and a manufacturing method thereof, and solves the technical problems of cost increase and hot rolling equipment energy consumption increase due to adding of precious alloy elements in existing 450MPa grade yield strength thick hot rolled sheet steel. The thick hot rolled sheet steel with 450MPa grade yield strength provided by the invention comprises the following chemical components by weight percentage: 0.11%-0.16% of C, 0.15%-0.25% of Si, 1.0%-.3% of Mn, less than or equal to 0.018% of P, less than or equal to 0.008% of S, 0.020%-0.035% of Nb, 0.015%-0.025% of Ti, 0.010%-0.050% of Alt, 0.0015%-0.0040% of Ca, and the balance iron and unavoidable inclusions. The product involved in the invention can be used for construction, ocean engineering, engineering machinery and other industries.
Description
Technical field
The present invention relates to a kind of thick specification hot-rolled, the thick specification hot-rolled and manufacture method particularly to a kind of yield strength 450MPa level。
Background technology
At present, tensile strength is at the structural steel of 500MPa～550MPa, and its schedule of reinforcement includes refined crystalline strengthening, solution strengthening and precipitation strength etc., and refined crystalline strengthening is to improve the only resource of intensity and toughness simultaneously。Therefore, under required power with capacity of equipment permissive condition, crystal grain thinning is the basis realizing material Strengthening and Toughening。Secondly, it is necessary to realize further solid solution and precipitation strength by adding alloying element, but so one side adds the cost of alloy of steel, inevitably causes the decline of toughness of material and the deterioration of welding performance simultaneously。
Chinese patent application 200310104865.4 discloses a kind of low carbon 42 MPa grade composite fortified ultrafine crystal grain band steel, Chinese patent application 200310104864.X discloses a kind of low carbon 42 MPa grade composite fortified ultrafine crystal grain band steel preparation method, both of which is with refined crystalline strengthening for main method, proposing for yield strength is 420～450MPa, and tensile strength is structural steel composition and the process of 530～550MPa；In disclosed preparation method, finish rolling finishing temperature is 770～790 DEG C, and rolling rear coiling temperature is 430～470 DEG C, although current equipment of hot rolling can meet the requirement of this technique, but can increase the energy consumption of equipment greatly, improve production cost；Additionally, the plasticity such as elongation after fracture and ballistic work, toughness index are not promised by it, limit the use occasion of steel plate, application when in particular for excellent toughness and low-temperature flexibility；Also not to the product thickness that is suitable for of composition and technique carry out clearly；Producing from iron and steel enterprise and realize, for the steel plate of different-thickness, various schedule of reinforcements are to the contribution rate of final strength inconsistent。Such as, compared with sheet metal, thickness is that 8mm～16mm steel plate is often difficult to obtain suitable finish rolling reduction ratio, and average cooldown rate is relatively low, and final crystallite dimension is generally big than sheet metal。Therefore, in order to obtain the steel plate of equality strength rank, it is necessary to increase the consumption of alloying element, often bring the increase of cost of alloy。
Therefore, in order to overcome the deficiency of above-mentioned technology, it is necessary to study a kind of high-strength cold-formed steel production technology for 8mm～16mm think gauge, and can realize manufacturing with energy consumption cost with relatively low cost of alloy。
Summary of the invention
In order to overcome the deficiencies in the prior art, it is desirable to provide a kind of yield strength 450MPa level is thick specification hot-rolled and manufacture method, and the present invention is by adopting suitable composition design and hot rolling technology design, it is ensured that the performance of material。
It is an object of the invention to provide that a kind of yield strength 450MPa level is thick specification hot-rolled and manufacture method, the expensive alloying elements that adds solving the existing thick specification hot-rolled existence of yield strength 450MPa level causes the technical problem that cost increases, equipment of hot rolling energy consumption increases。
The technical solution used in the present invention is:
A kind of yield strength 450MPa level is thick specification hot-rolled, its chemical component weight percentage ratio is: C:0.11%～0.16%, Si:0.15%～0.25%, Mn:1.0%～1.3%, P≤0.018%, S≤0.008%, Nb:0.020%～0.035%, Ti:0.015%～0.025%, Alt:0.010%～0.050%, Ca:0.0015%～0.0040%, surplus is ferrum and is unavoidably mingled with。
The reason that the thick specification hot-rolled chemical composition of yield strength 450MPa level of the present invention is limited in above-mentioned scope is as follows:
Carbon: improve carbon content, to improving, intensity is favourable, but too high carbon content can form the carbide particle of more thick fragility in steel, and plasticity and toughness is unfavorable, carbon content too high also can at steel plate central segregation band, bending property mouldability is unfavorable。Simultaneously too high carbon content increases welding carbon equivalent, is unfavorable for that C content that welding processing, the present invention set is as 0.11%～0.16%。
Silicon: silicon is solid-solubilized in steel matrix to have significantly strengthens effect, but silicone content is too high unfavorable to steel plate plasticity and toughness, and the too high meeting of silicone content simultaneously forms the serious Fe being difficult to remove on hot rolled plate surface2O3, affect product appearance and sequent surface process。The present invention limits Si content as 0.15%～0.25%。
Manganese: manganese can play the effect of solution strengthening in the present invention on the one hand, can expand γ district simultaneously, reduces γ → α transition temperature, fining ferrite grains and pearlite interlamellar spacing。But Mn content is high, the cost of steel can be increased accordingly, banded segregation tissue can be formed simultaneously and reduce processability, also can increase carbon equivalent, be unfavorable for welding。The present invention limits Mn content range as 1.0%～1.3%。
Sulfur and phosphorus: sulfur forms sulphide inculsion in steel so that it is ductility and toughness reduce。During steel rolling, owing to MnS is mingled with along with rolling direction extends, makes the anisotropy of steel increase the weight of, time serious, cause Laminated steel, have a strong impact on the cold formability of steel plate。Sulfur content is high unfavorable to the weldability of steel simultaneously。Phosphorus height increases the cold brittleness of steel, makes the brittle transition temperature of steel increase, makes the impact flexibility of steel be remarkably decreased。But considering actual process control ability, the present invention limits S≤0.008%, P≤0.018%。
Niobium: niobium effect in the present invention is to improve austenitic recrystallization temperature, deformed austenite is obtained at finishing stands, more forming core core is provided for follow-up ferrite transformation, finally give the ferrite crystal grain of refinement, it is ensured that on high intensity basis, keep higher plasticity and toughness and cold roll forming。The present invention limits Nb content as 0.020%～0.035%。
Titanium: titanium effect one in the present invention is to be combined into TiN with the nitrogen in steel, reduce the strong N adverse effect to steel, Ti can hinder the austenite structure alligatoring of welding overheated zone, welding heat affected zone on the other hand, is effectively improved the welding performance of think gauge hot-rolled product。The present invention limits Ti content as 0.015%～0.025%。
Aluminum: aluminum effect in the present invention is the effect playing deoxidation, and aluminum is strong oxidizing property forming element, and in steel, oxygen forms Al2O3Remove when steel-making。Aluminum is too high can form too much Al2O3It is mingled with, and continuous casting is easily to block sprue gate。The present invention limits Al content as 0.01%～0.05%。
Calcium: calcium primarily serves the effect of field trash deformation in the present invention, makes Al2O3Become the calcium-aluminate of low melting point, and make the MnS form of strip be improved as spherical complex inclusion, it is possible to be effectively improved the plasticity of steel plate, toughness and brake forming。The present invention limits Ca content as 0.0015%～0.0040%。
The manufacture method that a kind of yield strength 450MPa level is thick specification hot-rolled, the method includes:
Molten steel obtains continuous casting steel billet through continuous casting, the mass percent of wherein said molten steel composition is: C:0.11%～0.16%, Si:0.15%～0.25%, Mn:1.0%～1.3%, P≤0.018%, S≤0.008%, Nb:0.020%～0.035%, Ti:0.015%～0.025%, Alt:0.010%～0.050%, Ca:0.0015%～0.0040%, surplus is ferrum and inevitable impurity；
Continuous casting steel billet, in 1200 DEG C～1240 DEG C, carries out hot rolling after heating, described hot rolling is two-part rolling mill practice, roughing is 5 passage tandem rollings, rolling more than austenite recrystallization temperature, roughing end temp is 1020～1070 DEG C, and it is 45mm～52mm that roughing controls workpiece thickness；Roughing carries out finish rolling by Coil Box by reinflated after curling for intermediate blank after terminating, and finish rolling is 6 passage tandem rollings, and in austenite non-recrystallization temperature interval rolling, finish rolling end temp is 800 DEG C～840 DEG C, and finish rolling reduction ratio is more than 70%；After finish rolling, steel plate finished product thickness is 8～16mm, and section cooling adopts leading portion cold by force, and coiling temperature is 500 DEG C～570 DEG C and batches and obtain finished product。
The reason of the hot rolling technology system that the present invention takes is as follows:
1, the setting of continuous casting steel billet heating-up temperature
Calculating it can be seen that slab heating temperature is it is first necessary to ensure the abundant solid solutions of alloying element such as Ti, but if heating-up temperature is too high, original austenite grains can be made thick, the tissue making steel is thick, is unfavorable for processability, and to consume the too much energy。The continuous casting steel billet heating-up temperature that the present invention sets is as 1200 DEG C～1240 DEG C。
2, roughing end temp sets
Rolling process of rough rolling controls to roll more than austenite recrystallization temperature, it is ensured that austenite, through repeated deformation and recrystallization, obtains uniformly tiny austenite crystal。Therefore the present invention sets roughing end temp as 1020 DEG C～1070 DEG C。
3, finish rolling end temp and workpiece thickness set
The purpose that finish rolling end temp of the present invention sets is by austenitic critical temperature (Ar3) the neighbouring end thick specification hot-rolled middle acquisition superfine grained structure of rolling deformation, it is necessary to ensure at lower temperature (Ar3Near) implement aximal deformation value。Roll by the temperature range that austenite Unhydrated cement is relatively low, obtain inside and have the flat austenite crystal of Zona transformans, increase grain boundary area, increase phase deformed nucleus core, laminar cooling process subsequently is transformed into tiny ferrite crystal grain, plays the effect of refined crystalline strengthening。Therefore finishing temperature is too high, then cannot play refined crystalline strengthening effect, and finishing temperature is too low, increases mill load on the one hand, then can enter two-phase section rolling on the other hand and cause the generation of mixed crystal。Therefore the present invention sets finish rolling end temp as 800 DEG C～840 DEG C, workpiece thickness is to ensure that finish rolling has enough reduction ratios, but excessive workpiece thickness can increase the load of precision rolling equipment and influence of rolled speed, reduce the production efficiency present invention and set workpiece thickness as 45mm～52mm。
4, the setting of hot-rolling coiling temperature
Rate of cooling fast after deformation can suppress ferrite crystal grain to grow up, and simultaneously low coiling temperature can also eliminate the banded structure that element segregation is formed, and improves thick specification hot-rolled cold roll forming performance。But coiling temperature is too low, it is easy to form Widmannstatten structure and can reduce plasticity and the toughness of material on the contrary。Considering, the present invention sets hot-rolling coiling temperature as 500 DEG C～570 DEG C。
The microscopic structure of 8～16mm thickness yield strength 450MPa level hot rolled steel plate that the present invention obtains is fine grain ferrite+tiny pearlite, tissue grain size number is 10～12 grades, lower yield strength Rel >=the 430MPa of hot rolled steel plate, tensile strength Rm >=510MPa, elongation after fracture A >=19%, 180 ° of cold bending tests, d=0a is qualified。
The present invention has following good effect compared to existing technology:
1, the present invention is by optimizing material chemical composition design, gives full play to the strengthening effect of C, to reduce the consumption that makes of alloying element, reduces the cost of alloy of product；Meanwhile, suppress C% to increase the adverse effect that steel plate elongation percentage is brought by controlling S%, improve the elongation percentage of finished product。
2, the present invention is by optimizing hot continuous rolling process, by the rolling deformation and 820 at Unhydrated cementoLow temperature finish to gauge near C makes austenite crystal flattening, increases grain boundary area, increases phase deformed nucleus core；On the other hand by 550oLow temperature near C batches suppression ferrite crystal grain and grows up, and fully refines microstructure。The think gauge cold formability steel obtained has low cost, high intensity, a high-elongation, good cold-bending property, lower yield strength Rel >=430MPa, the tensile strength Rm >=510MPa of 8～16mm thickness hot rolled steel plate, elongation after fracture A >=19%, and 180oCold bending test, d=0a is qualified。
Accompanying drawing explanation
Accompanying drawing is the metallographic structure photo of the embodiment of the present invention 1 hot rolled steel plate。
Detailed description of the invention
Below in conjunction with embodiment 1～4, the present invention will be further described。
Table 1 chemical composition of the present invention (percentage by weight %), surplus is Fe and inevitable impurity。
According to the requirement of material composition of the present invention design, adopting molten iron pre-desulfurization, converter top bottom blowing, blow Ar station (or LF stove) and ensure bottom blowing Ar, continuous casting whole process blows Ar protective casting, is cast into continuous casting steel billet。
After the heated stove of continuous casting steel billet reheats, Total continuity hot tandem rolling mill rolls, process control parameter, in Table 2, first passes through roughing milling train and carries out roughing rolling, and it is 45mm～52mm that roughing controls workpiece thickness, reinflated after Coil Box is curling by intermediate blank carry out finish rolling, after finish rolling Continuous mill train controlled rolling, it is controlled quick cooling, then batches, producing qualified hot-rolled sheet coil, steel plate finished product thickness is 8～16mm。
Table 2 hot rolling technology of the present invention controls parameter
| Hot Rolling Parameters | Slab heating temperature/DEG C | Roughing end temp/DEG C | Intermediate blank thickness/mm | Finish rolling end temp/DEG C | Finish rolling reduction ratio/% | Coiling temperature/DEG C |
| The present invention | 1200-1240 | 1020-1070 | 45-53 | 800-840 | ≥70 | 500-570 |
| Embodiment 1 | 1220 | 1070 | 53 | 820 | 71 | 550 |
| Embodiment 2 | 1230 | 1053 | 49 | 830 | 72 | 530 |
| Embodiment 3 | 1225 | 1046 | 47 | 810 | 73 | 500 |
| Embodiment 4 | 1238 | 1025 | 45 | 800 | 82 | 570 |
Utilizing the yield strength 450MPa level that said method obtains thick specification hot-rolled, with reference to accompanying drawing, the microscopic structure of hot rolled steel plate is fine grain ferrite+tiny pearlite, and grain size number is 10～12 grades。
The hot rolled steel plate present invention obtained carries out tension test according to " GB/T228.1-2010 metal material stretching test part 1: room temperature test method ", according to " GB/T232-2010 " bend test of metal materials method " is curved test, and its mechanical property is in Table 3。
The thickness that the present invention obtains is the advantage that the hot rolled steel plate of 8～16mm has high intensity, high-elongation, has good wide cold-bending property, the lower yield strength Rel >=430MPa of hot rolled steel plate simultaneously, tensile strength Rm >=510MPa, elongation after fracture A >=19%, 180 ° of cold bending tests, d=0a is qualified。
The mechanical property of table 3 hot rolled steel plate of the present invention
In addition to the implementation, the present invention can also have other embodiments。All employings are equal to replacement or the technical scheme of equivalent transformation formation, all fall within the protection domain of application claims。
Claims (5)
1. a yield strength 450MPa level is thick specification hot-rolled, the mass percent of its chemical composition is: C:0.11%～0.16%, Si:0.15%～0.25%, Mn:1.0%～1.3%, P≤0.018%, S≤0.008%, Nb:0.020%～0.035%, Ti:0.015%～0.025%, Alt:0.010%～0.050%, Ca:0.0015%～0.0040%, surplus is ferrum and is unavoidably mingled with。
2. yield strength 450MPa level as claimed in claim 1 is thick specification hot-rolled, and it is organized as fine grain ferrite+tiny pearlite, and described tissue grain size is 10～12 grades。
3. yield strength 450MPa level as claimed in claim 1 or 2 is thick specification hot-rolled, and lower yield strength Rel >=430MPa, the tensile strength Rm >=510MPa of its 8～16mm thickness hot rolled steel plate, elongation after fracture A >=19%, 180 ° of cold bending tests, d=0a is qualified。
4. the manufacture method that yield strength 450MPa level as described in as arbitrary in claim 13 is thick specification hot-rolled, including:
Molten steel obtains continuous casting steel billet through continuous casting；
Continuous casting steel billet, in 1200 DEG C～1240 DEG C, carries out hot rolling after heating, described hot rolling is two-part rolling mill practice, roughing is 5 passage tandem rollings, rolling more than austenite recrystallization temperature, roughing end temp is 1020～1070 DEG C, and it is 45mm～52mm that roughing controls workpiece thickness；Roughing carries out finish rolling by Coil Box by reinflated after curling for intermediate blank after terminating, and finish rolling is 6 passage tandem rollings, and in austenite non-recrystallization temperature interval rolling, finish rolling end temp is 800 DEG C～840 DEG C, and finish rolling reduction ratio is more than 70%；After finish rolling, section cooling adopts leading portion cold by force, and coiling temperature is 500 DEG C～570 DEG C and batches and obtain finished product。
5. the manufacture method that yield strength 450MPa level as claimed in claim 4 is thick specification hot-rolled, it is characterised in that after finish rolling, controlling steel plate finished product thickness is 8～16mm。
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| CN109536846A (en) * | 2017-09-21 | 2019-03-29 | 上海梅山钢铁股份有限公司 | Yield strength 700MPa grade high ductility hot rolled steel plate and its manufacturing method |
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| CN111690869A (en) * | 2019-03-11 | 2020-09-22 | 上海梅山钢铁股份有限公司 | Hot-rolled steel plate for cold-bending steel sheet pile and manufacturing method thereof |
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| CN112553524A (en) * | 2019-09-26 | 2021-03-26 | 上海梅山钢铁股份有限公司 | Hot rolled steel plate with yield strength of 360MPa for pipeline and manufacturing method thereof |
| CN112410667A (en) * | 2020-11-10 | 2021-02-26 | 马鞍山钢铁股份有限公司 | Low-cost thick Q355E hot-rolled H-shaped steel and manufacturing method thereof |
| CN115572891A (en) * | 2021-06-21 | 2023-01-06 | 上海梅山钢铁股份有限公司 | Cold-rolled annealed steel strip with yield strength of 420MPa for art designing blade |
| CN115572891B (en) * | 2021-06-21 | 2023-09-05 | 上海梅山钢铁股份有限公司 | Cold-rolled annealed steel strip with yield strength of 420MPa for art knife blade |
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Application publication date: 20160622 |
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