CN105039851A - Titanium alloyed TAM steel and manufacturing method thereof - Google Patents
Titanium alloyed TAM steel and manufacturing method thereof Download PDFInfo
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Abstract
The invention relates to titanium alloyed TAM steel and a manufacturing method thereof and belongs to the technical field of design and thermal processing of metal ingredients. The titanium alloyed TAM steel disclosed by the invention comprises the following chemical ingredients in weight percentage: 0.18-0.21 percent of C, 1.48-1.55 percent of Si, 1.90-2.20 percent of Mn, smaller than or equal to 0.020 percent of P, smaller than or equal to 0.015 percent of S, 0.04-0.06 percent of Ti, smaller than or equal to 0.04 percent of Al and the balance Fe and inevitable impurities. According to the titanium alloyed TAM steel disclosed by the invention, a suitable amount of titanium is added in a titanium alloying way; the toughness of the TAM steel is improved by precipitation of carbides and the like of titanium, so that the comprehensive mechanical properties of the titanium-containing TAM steel are improved, and a steel plate is enabled to have relatively high strength and plasticity and is especially excellent in hydrogen induced delay cracking resistance. The titanium-containing TAM steel disclosed by the invention is produced by adopting a novel process, i.e., a Q and P process, so that steel tissues are more stable in performance.
Description
Technical field
The present invention relates to a kind of Ti Alloying TAM steel and manufacturing process thereof, belong to metal ingredient design and technical field of hot working.
Background technology
TAM steel, also known as TRIP type annealing martensitic steel (TRIP-aidedAnnealedMartensiteMatrix), is the one of Q & P steel.Automobile with Q & P (QuenchingandParTiTioning) steel as third generation AHSS (AdTiancedHighStrengthSteels) steel, there is inherent advantage, reach the matched well of intensity and plasticity, laboratory test data shows, automobile by the intensity of Q & P steel at more than 1000MPa, and unit elongation reaches more than 18%, the requirement of the parts such as collision bumper (anti-collision beam), side collision prevention girders (W type) can be competent at completely.The maximum feature of TAM steel is the polygonal ferrite matrix or the bainite matrix that breach traditional TRIP steel, employ the annealing lath martensitic stucture that lath martensite is formed when two-phase region reheats, coordinate with sheet residual austenite between lath, obtain excellent mechanical property.This kind of steel is general utilizes precipitate to strengthen also by adding Nb and TI etc., obtains excellent mechanical property.In recent years, the exploitation of ultrahigh-strength steel and becoming increasingly conspicuous of Delayed hydride cracking problem, titanium also obtains large quantifier elimination improving the effect in the resistance to Delayed hydride cracking of ultrahigh-strength steel.When trace Ti is solidly soluted in austenite, and in low temperature aging subsequently again after disperse educt, possess strong hydrogen trapping effect, Recent study finds, titanium mainly separates out by crystal grain thinning and TiC the resistance for delayed fracture improving high-strength steel as irreversible hydrogen trap.
Wherein, phase change induction plasticity steel (TRIP steel) is why than the alloy chemical combination Transformation Principle that the reason of other high-strength steel excellent performances is according to steel, adopt specific chemical composition and unique thermal treatment process, fully use the result of " transformation induced martensite effect " in steel.When containing a certain amount of austenite former in steel, again in two-phase region (α+γ) temperature critical annealing and in subsequently warm austempering, thus obtain relatively large residual austenite, when steel be subject to load effect deform time, the residual austenite in steel will be made to carry out strain induced martensite phase transformation, cause the intensity of steel, plasticity significantly improves, and is " TRIP effect ".
And for novel process---the Q & P technique of steel heat treatment, different from traditional quenching-tempering process, it is to obtain stable residual austenite, containing Si, Al (even P) element in application steel, to hinder Fe
3the precipitation of C, makes carbon be assigned to austenite from martensite, and austenite should rich carbon, can not change martensite into when again cooling, for high-strength steel has effective technique that toughness provides new concurrently.Meanwhile, after stable austenite film is formed around martensite bundle, reduce hydrogen induced cracking spreading rate, thus improve steel resistant to hydrogen and cause delayed fracture property.
In prior art, the research of TRIP steel is adopted mostly to the ordinary steel not adding titanium, and technique only uses traditional technology, the comprehensive mechanical property of its TRIP steel prepared, such as intensity and plasticity, especially its resistant to hydrogen causes delayed fracture property, all can't meet the requirement of third generation automobile steel.
Summary of the invention
First technical problem to be solved by this invention is to provide one and has better intensity and plasticity, especially has the Ti Alloying TAM steel that excellent resistant to hydrogen causes delayed fracture property.
Ti Alloying TAM steel, its chemical composition is by weight percentage: C0.18 ~ 0.21%, Si1.48 ~ 1.55%, Mn1.90 ~ 2.20%, P≤0.020%, S≤0.015%, Ti0.04 ~ 0.06%, Al≤0.04%, and surplus is Fe and inevitable impurity.
Further, as preferred technical scheme, Ti Alloying TAM steel described above, its chemical composition is by weight percentage: C0.1963%, Si1.53%, Mn2.13%, P0.0067%, S0.0056%, Ti0.05%, Al0.0088%, and surplus is Fe and inevitable impurity.
Ti Alloying TAM steel described above, its yield strength R
p0.2> 500MPa, tensile strength Rm > 1050MPa, elongation after fracture A > 25%, strength and ductility product Rm × A > 25GPa%.
Further, as preferred technical scheme, Ti Alloying TAM steel described above, the yield strength R of steel
p0.2=649MPa, tensile strength Rm=1112MPa, elongation after fracture A=26.8%, strength and ductility product Rm × A=29.8GPa%.
Ti Alloying TAM steel described above, its metallographic structure is martensitic matrix+residual austenite+bainite/ferritic mixed structure.
The obdurability of the present invention owing to adopting the precipitation of the carbide of the slab titaniferous of new titanium alloy Composition Design etc. to improve TAM steel, thus improve the comprehensive mechanical property of titaniferous TAM steel, especially show that Ti-containing steel has excellent resistant to hydrogen and causes delayed fracture property, this steel grade can make full use of climbs steel v-ti magnetite ore resources.By system, the hydrogen trap potentiality scientifically grasping various tissue defects and precipitate in steel, set up the solution of the anti-Delayed hydride cracking of storage hydrogen ferrous materials and ultrahigh-strength steel, no matter be significant for the development & application of third generation automobile steel, strategic material stock technology is provided to the utilization of following hydrogen energy source, promote national economy sustainable development, safeguard that national energy security provides material guarantee.China can be made to be in international forward position in the research in this field simultaneously, form design of material and the control techniques with independent intellectual property right.
Second technical problem to be solved by this invention is to provide a kind of preparation method of Ti Alloying TAM steel.
The preparation method of Ti Alloying TAM steel, it specifically comprises traditional mechanical rolling technology smelting, hot rolling, cold rolling and novel process Q & P technique:
A, mechanical press technique: steel billet is smelted and is cast into slab, heat 70 ~ 90min at 1150 ~ 1250 DEG C after, then hot rolling is rolled into the thick hot-rolled steel sheet of 3 ~ 5mm, then through cold rolling to 1 ~ 1.5mm, cold rolling draft is 65 ~ 75%, obtains ferrite+pearlitic structure; Wherein, hot rolling finishing temperature 750 ~ 850 DEG C, coiling temperature 650 ~ 700 DEG C;
B, Q & P technique: cold-reduced sheet a step obtained, is first warming up to austenitizing temperature 900 ~ 920 DEG C with 10 DEG C/s, insulation 600s, then is cooled to room temperature with 50 DEG C/s; Then be again warming up to annealing temperature 760 ~ 850 DEG C with 10 DEG C/s, insulation 600s, then be cooled to partition temperature 150 ~ 450 DEG C with 50 DEG C/s, insulation 50 ~ 200s, is finally cooled to room temperature with 50 DEG C/s, obtains final product.
Further, as preferred technical scheme, the preparation method of Ti Alloying TAM steel described above:
After in a step, slab preferably heats 80min at 1200 DEG C, then hot rolling is rolled into the thick hot-rolled steel sheet of 4mm, then obtains cold-rolled steel sheet after 1.2mm through cold rolling, and cold rolling draft is 70%; Wherein, hot rolling finishing temperature is preferably 800 DEG C, and coiling temperature is preferably 670 DEG C;
By the cold-reduced sheet that a step obtains in b step, be first warming up to austenitizing temperature 920 DEG C with 10 DEG C/s, insulation 600s, then be cooled to room temperature with 50 DEG C/s; Then annealing temperature 800 DEG C is again warming up to 10 DEG C/s, insulation 600s, then be cooled to partition temperature 400 DEG C with 50 DEG C/s, insulation 200s, finally be cooled to room temperature with 50 DEG C/s, obtaining metallographic structure of the present invention is martensitic matrix+residual austenite+bainite/ferritic mixed structure TAM steel.
TAM steel prepared by the preparation method of preferred Ti Alloying TAM steel described above, its yield strength R
p0.2=649MPa, tensile strength Rm=1112MPa, elongation after fracture A=26.8%, strength and ductility product Rm × A=29.8GPa%.
Wherein, in a step, hot rolling technology can adopt 2050 hot strip rolling mill, needs hot-rolled steel sheet pickling before cold rolling on cold-rolling mill, to remove surface scale and greasy dirt.
The present invention adopts Ti Alloying mode to add appropriate titanium, the obdurability of TAM steel is improved by the precipitation of the carbide of titanium etc., thus improve the comprehensive mechanical property of titaniferous TAM steel, make steel plate have higher intensity and plasticity, especially there is excellent resistant to hydrogen and cause delayed fracture property.The producing and manufacturing technique of titaniferous TAM steel of the present invention, adds a process annealing process compared with common production method, makes steel structure property more stable.
Embodiment
Ti Alloying TAM steel, its chemical composition is by weight percentage: C0.18 ~ 0.21%, Si1.48 ~ 1.55%, Mn1.90 ~ 2.20%, P≤0.020%, S≤0.015%, Ti0.04 ~ 0.06%, Al≤0.04%, and surplus is Fe and inevitable impurity.
Further, as preferred technical scheme, Ti Alloying TAM steel described above, its chemical composition is by weight percentage: C0.1963%, Si1.53%, Mn2.13%, P0.0067%, S0.0056%, Ti0.05%, Al0.0088%, and surplus is Fe and inevitable impurity.
Ti Alloying TAM steel described above, its yield strength R
p0.2> 500MPa, tensile strength Rm > 1050MPa, elongation after fracture A > 25%, strength and ductility product Rm × A > 25GPa%.
Further, as preferred technical scheme, Ti Alloying TAM steel described above, the yield strength R of steel
p0.2=649MPa, tensile strength Rm=1112MPa, elongation after fracture A=26.8%, strength and ductility product Rm × A=29.8GPa%.
Ti Alloying TAM steel described above, its metallographic structure is martensitic matrix+residual austenite+bainite/ferritic mixed structure.
The obdurability of the present invention owing to adopting the precipitation of the carbide of the slab titaniferous of new titanium alloy Composition Design etc. to improve TAM steel, thus improve the comprehensive mechanical property of titaniferous TAM steel, especially show that Ti-containing steel has excellent resistant to hydrogen and causes delayed fracture property, this steel grade can make full use of climbs steel v-ti magnetite ore resources.By system, the hydrogen trap potentiality scientifically grasping various tissue defects and precipitate in steel, set up the solution of the anti-Delayed hydride cracking of storage hydrogen ferrous materials and ultrahigh-strength steel, no matter be significant for the development & application of third generation automobile steel, strategic material stock technology is provided to the utilization of following hydrogen energy source, promote national economy sustainable development, safeguard that national energy security provides material guarantee.China can be made to be in international forward position in the research in this field simultaneously, form design of material and the control techniques with independent intellectual property right.
The preparation method of Ti Alloying TAM steel, it specifically comprises traditional mechanical rolling technology smelting, hot rolling, cold rolling and novel process Q & P technique:
A, mechanical press technique: steel billet is smelted and is cast into slab, heat 70 ~ 90min at 1150 ~ 1250 DEG C after, then hot rolling is rolled into the thick hot-rolled steel sheet of 3 ~ 5mm, then through cold rolling to 1 ~ 1.5mm, cold rolling draft is 65 ~ 75%, obtains ferrite+pearlitic structure; Wherein, hot rolling finishing temperature 750 ~ 850 DEG C, coiling temperature 650 ~ 700 DEG C;
B, Q & P technique: cold-reduced sheet a step obtained, is first warming up to austenitizing temperature 900 ~ 920 DEG C with 10 DEG C/s, insulation 600s, then is cooled to room temperature with 50 DEG C/s; Then be again warming up to annealing temperature 760 ~ 850 DEG C with 10 DEG C/s, insulation 600s, then be cooled to partition temperature 150 ~ 450 DEG C with 50 DEG C/s, insulation 50 ~ 200s, is finally cooled to room temperature with 50 DEG C/s, obtains final product.
Further, as preferred technical scheme, the preparation method of Ti Alloying TAM steel described above:
After in a step, slab preferably heats 80min at 1200 DEG C, then hot rolling is rolled into the thick hot-rolled steel sheet of 4mm, then obtains cold-rolled steel sheet after 1.2mm through cold rolling, and cold rolling draft is 70%; Wherein, hot rolling finishing temperature is preferably 800 DEG C, and coiling temperature is preferably 670 DEG C;
By the cold-reduced sheet that a step obtains in b step, be first warming up to austenitizing temperature 920 DEG C with 10 DEG C/s, insulation 600s, then be cooled to room temperature with 50 DEG C/s; Then annealing temperature 800 DEG C is again warming up to 10 DEG C/s, insulation 600s, then be cooled to partition temperature 400 DEG C with 50 DEG C/s, insulation 200s, finally be cooled to room temperature with 50 DEG C/s, obtaining metallographic structure of the present invention is martensitic matrix+residual austenite+bainite/ferritic mixed structure TAM steel.
TAM steel prepared by the preparation method of preferred Ti Alloying TAM steel described above, its yield strength R
p0.2=649MPa, tensile strength Rm=1112MPa, elongation after fracture A=26.8%, strength and ductility product Rm × A=29.8GPa%.
Wherein, in a step, hot rolling technology can adopt 2050 hot strip rolling mill, needs hot-rolled steel sheet pickling before cold rolling on cold-rolling mill, to remove surface scale and greasy dirt.
Below in conjunction with embodiment, the specific embodiment of the present invention is further described, does not therefore limit the present invention among described scope of embodiments.
Embodiment 1
Each composition percentage composition of Ti Alloying TAM steel of the present invention is with reference to shown in table 1:
The percentage composition of table 1 Ti Alloying TAM steel
Carry out traditional mechanical rolling technology smelting, hot rolling, cold rolling and novel process Q & P technique according to each composition percentage composition of Ti Alloying TAM steel in table 1, its traditional mechanical rolling technology concrete technology parameter is in table 2:
Table 2 mechanical press technique concrete technology parameter
Novel process Q & P technique concrete technology parameter is in table 3:
Table 3Q & P technique concrete technology parameter
According to each composition percentage composition and table 2 mechanical press technique, the table 3Q & P technique of Ti Alloying TAM steel in table 1, the mechanical property of obtained TAM steel is in table 4:
The mechanical property of table 4 Ti Alloying TAM steel
| Numbering | Yield strength/MPa | Tensile strength/MPa | Elongation after fracture | Strength and ductility product/GMa% |
| 1 | 649 | 1112 | 26.8％ | 29.8 |
| 2 | 668 | 1243 | 26.1％ | 32.4 |
| 3 | 687 | 1098 | 25.3％ | 27.8 |
| 4 | 669 | 1026 | 25.9％ | 26.6 |
| 5 | 654 | 1203 | 26.7％ | 30.5 |
Claims (7)
1. Ti Alloying TAM steel, it is characterized in that: its chemical composition is by weight percentage: C0.18 ~ 0.21%, Si1.48 ~ 1.55%, Mn1.90 ~ 2.20%, P≤0.020%, S≤0.015%, Ti0.04 ~ 0.06%, Al≤0.04%, surplus is Fe and inevitable impurity.
2. Ti Alloying TAM steel according to claim 1, it is characterized in that: its chemical composition is by weight percentage: C0.1963%, Si1.53%, Mn2.13%, P0.0067%, S0.0056%, Ti0.05%, Al0.0088%, surplus is Fe and inevitable impurity.
3. Ti Alloying TAM steel according to claim 1 or 2, is characterized in that: the yield strength R of steel
p0.2> 500MPa, tensile strength Rm > 1050MPa, elongation after fracture A > 25%, strength and ductility product Rm × A > 25GPa%.
4. Ti Alloying TAM steel according to claim 3, is characterized in that: the yield strength R of steel
p0.2=649MPa, tensile strength Rm=1112MPa, elongation after fracture A=26.8%, strength and ductility product Rm × A=29.8GPa%.
5. the preparation method of Ti Alloying TAM steel described in any one of Claims 1 to 4, is characterized in that: comprise the following steps:
A, mechanical press technique: smelted by steel and be cast into slab, heat 70 ~ 90min at 1150 ~ 1250 DEG C after, hot rolling obtains the thick hot-rolled steel sheet of 3 ~ 5mm, then obtains 1 ~ 1.5mm thick cold rolled steel sheet through cold rolling; Wherein, hot rolling finishing temperature 750 ~ 850 DEG C, coiling temperature 650 ~ 700 DEG C, cold rolling draft is 65 ~ 75%;
B, Q & P technique: cold-reduced sheet a step obtained, is first warming up to austenitizing temperature 900 ~ 920 DEG C with 10 DEG C/s, insulation 600s, then is cooled to room temperature with 50 DEG C/s; Then be again warming up to annealing temperature 760 ~ 850 DEG C with 10 DEG C/s, insulation 600s, then be cooled to partition temperature 150 ~ 450 DEG C with 50 DEG C/s, insulation 50 ~ 200s, is finally cooled to room temperature with 50 DEG C/s, obtains final product.
6. the preparation method of Ti Alloying TAM steel according to claim 5, it is characterized in that: after slab heats 80min at 1200 DEG C in a step, then hot rolling is rolled into the thick hot-rolled steel sheet of 4mm, then obtains 1.2mm thick cold rolled steel sheet through cold rolling; Wherein, hot rolling finishing temperature is 800 DEG C, and coiling temperature is 670 DEG C, and cold rolling draft is 70%.
7. the preparation method of Ti Alloying TAM steel according to claim 5, is characterized in that: in b step, austenitizing temperature is 920 DEG C; Annealing temperature is 800 DEG C; Partition temperature is 400 DEG C, is incubated 200s under partition temperature.
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| CN105908093A (en) * | 2016-06-03 | 2016-08-31 | 北京科技大学 | Vanadium-titanium compound addition steel plate with high fatigue strength and manufacturing method |
| CN108179256A (en) * | 2018-02-06 | 2018-06-19 | 东北大学 | A kind of heat treatment method for improving Cold-Rolled TRIP Steel strength and ductility product |
| JP2021502486A (en) * | 2017-11-10 | 2021-01-28 | アルセロールミタル | Cold-rolled heat-treated steel sheet and its manufacturing method |
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