CN105779864B - Dispersion-strengtherning microalloy high strength steel and its production method - Google Patents
Dispersion-strengtherning microalloy high strength steel and its production method Download PDFInfo
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- CN105779864B CN105779864B CN201610277961.6A CN201610277961A CN105779864B CN 105779864 B CN105779864 B CN 105779864B CN 201610277961 A CN201610277961 A CN 201610277961A CN 105779864 B CN105779864 B CN 105779864B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
Abstract
The invention discloses a kind of dispersion-strengtherning microalloy high strength steel, its chemical composition and content are：C：0.05~0.06%, Si：0.01~0.02%, Mn：0.47~0.53%, Al：0.02~0.05%, P≤0.010%, S≤0.006%, V：0.09~0.10%, N：0.007~0.008%, Ni：0.02~0.03%, Th：0.02~0.04%, Zr：0.012~0.018%, remaining is Fe and inevitable impurity.Production stage include desulfurizing iron, pneumatic steelmaking, application of vacuum, continuous casting, heating of plate blank, roll, batch, pickling, cold continuous rolling, heat treatment and finishing.Alloying component content of the present invention is reasonable in design, and technique is controllable, and mechanical property is functional, and welding performance, rebound performance and anti-delayed fracture performance are excellent, can be applied to make automobile structure and reinforcer.
Description
Technical field
It is micro- in particular to a kind of dispersion-strengtherning the present invention relates to the low-alloy structural steel manufacturing field in ferrous metallurgy materials
Alloy high-strength steel and its production method.
Background technology
In automobile structural steel field, with the growth requirement of practical application, the requirement to the combination property of steel is increasingly strict,
Not requiring nothing more than it has excellent mechanical property, while requires good forming property, welding performance, rebound performance and resist
Delayed fracture property.Research shows, in high-strength steel production process, due to the particularity of its composition and the high request of performance, leads
Cause its production technology extremely harsh, while lumber recovery and production efficiency are relatively low.
Entitled " influence of the microalloy element to carbon microalloy structure of steel and performance in V-N " text have studied microalloy element
The influence of species, content and production technology to carbon microalloy structure of steel and performance in V-N, but it is due to the content mistake of contained vanadium
Height, to smelting and rolled bands are come difficult, the easy side of strand is split, hot rolled plate also can side split, and the content of carbon and the too high levels of silicon, weldering
Difficulty is connect, punching press is also resulted in and produces resilience.
Therefore, rationally design the species and content of carbon and alloying element, optimized production process, ensure excellent comprehensive
Can, product lumber recovery and production efficiency are improved, reduces production cost, meet automobile structure and reinforcer applies needs, tool
There is important realistic meaning.
The content of the invention
It is an object of the invention to overcome above-mentioned deficiency, solve current domestic automobile structural member and reinforcer and given birth to high-strength steel
Some technical bottlenecks in production, there is provided a kind of manufacturing cost is low, production technology rationally controllable, high comprehensive performance dispersion-strengtherning
Microalloy high strength steel and its production method.
To achieve the above object, the technical solution adopted by the present invention is：A kind of dispersion-strengtherning microalloy high strength steel, the change of steel
Study point and its percentage by weight is as follows：C：0.05~0.06%, Si：0.01~0.02%, Mn：0.47~0.53%, Al：
0.02~0.05%, P≤0.010%, S≤0.006%, V：0.09~0.10%, N：0.007~0.008%, Ni：0.02~
0.03%, Th：0.02~0.04%, Zr：0.012~0.018%, remaining is Fe and inevitable impurity；Its metallographic structure is
Isometric/acicular ferrite+granular pearlite, and there are a large amount of dispersed granules to separate out, wherein content of pearlite in alloy is 11~13%.
Further, the chemical composition of steel and its percentage by weight are as follows：C：0.052~0.058%, Si：0.012~
0.018%, Mn：0.47~0.53%, Al：0.025~0.045%, P≤0.010%, S≤0.006%, V：0.09~
0.10%, N：0.007~0.008%, Ni：0.02~0.03%, Th：0.025~0.035%, Zr：0.014~0.016%,
Remaining is Fe and inevitable impurity.
Further, the chemical composition of steel and its percentage by weight are as follows：C：0.055%, Si：0.015%, Mn：
0.49%, Al：0.032%, P：0.005%, S：0.004%, V：0.095%, N：0.0073%, Ni：0.026%, Th：
0.028%, Zr：0.0155%, remaining is Fe and inevitable impurity.
The effect of each chemical composition is as follows in the dispersion-strengtherning microalloy high strength steel of the present invention：
Carbon (C)：Carbon is the solution strengthening element for the intensity for improving steel, strengthens positive effect, and suitable C content and micro- conjunction
Gold element combines, beneficial to dispersion-strengtherning.When content is higher, easily forms martensite and deteriorate the low-temperature flexibility of steel, be unfavorable for ensureing
Its formability and welding performance；Difficulty when when content is relatively low, armor plate strength can be made insufficient, while can also increase smelting.This hair
It is bright to control the C content scope to be：0.05~0.06%.
Silicon (Si)：Silicon is conventional deoxidier, has and melts invigoration effect admittedly, be advantageous to improve the intensity of steel, elastic limit and
Improve its combination property, but Si elements easily form the oxide layer Mn of densification in surface of steel plate2SiO4, so as to influence the plating of material
Zinc performance, can also have a negative impact to resilience.Therefore, the present invention controls Si content desired value 0.01~0.02%.
Manganese (Mn)：Manganese is important Strengthening and Toughening element, as austenite former, is expanding austenitic area, is reducing eventually
Temperature is rolled, austenite transformation is postponed, crystal grain thinning can be played a part of simultaneously.But Mn contents are too high, on the one hand increase cost,
On the other hand steel billet center segregation is adversely affected, impairs the toughness of steel plate, and easily cracked in welding, Mn
Content is too low, can not effectively facilitate medium temperature structural transformation, is easily reduced the intensity of steel.Therefore the Mn content ranges are controlled to be：0.47
~0.53%.
Aluminium (Al)：Aluminium plays a part of deoxidation in the present invention, but Al content is too high can bring smelting difficulty, while easily production
Life is mingled with, and controls the Al content to be in the present invention：0.02~0.05%.
Phosphorus (P)：Phosphorus is harmful element in steel, and its content will be controlled strictly, and high P content can increase the cold short of steel and incline
To, and P is easily segregated in the center portion of steel billet, because the high strong segregated zone of this P content is more crisp so that easily produced after steel rolling
Raw latent defect, meanwhile, adverse effect is brought to the plasticity, weldability and formability of steel.The present invention phosphorus content control for P≤
0.010%.
Sulphur (S)：Sulphur is harmful element in steel, and high S contents are also brought along not to the plasticity, weldability and formability of steel
Profit influences.Sulfur content of the present invention is S≤0.006%.
Vanadium (V), nickel (Ni) and nitrogen (N)：During the controlled rolling and in roller repairing, solid solution V and Ni is with disperse and micro-
Thin Carbonitride Precipitation, the intensity of steel is improved, suppress austenite recrystallization, improve the recrystallization temperature of austenite, refinement is rolled
Austenite crystal after system, prevents heating Austenite Grain Growth, and rear ferrite crystal grain is rolled in refinement.V and N combines to form carbonitride
Resolvability it is low, dispersion-strengthened effect is good, and N is remarkably improved the yield strength of steel.
Thorium (Th) and nickel (Ni)：Th is combined with Ni, and movement of the dispersed granules to dislocation plays barrier, beneficial to surrender
The guarantee of intensity, and do not damage plasticity.
Zirconium (Zr)：Zr can promote dispersed granules to separate out during phase transformation and after phase transformation, refine precipitate particle size, improve
Plasticity and toughness, strengthen crystal boundary.
Further, dispersion-strengtherning microalloy high strength steel of the invention is by element species and the scientific design of content,
Adding realizes the microalloy high strength steel with excellent comprehensive performance on the basis of appropriate alloying element, and its mechanical property is：Bend
Take intensity ReLFor 340~360MPa, tensile strength RmFor 450~470MPa, elongation percentage is 30~32%, strain hardening exponent n
For 0.19~0.21, rebound performance and anti-delayed fracture performance are good, have excellent welding performance and shape performance.
The production method of above-mentioned dispersion-strengtherning microalloy high strength steel, comprises the following steps：It is desulfurizing iron, pneumatic steelmaking, true
Vacancy reason, continuous casting, heating of plate blank, roll, batch, pickling, cold continuous rolling, heat treatment and finishing；In the vacuum processing step, very
Reciprocal of duty cycle is 40~100Pa, and vacuum processing time is 10~20min；In the heating of plate blank step, heating-up temperature be 1255~
1275℃；In the milling step, controlled rolling in two stages, roughing temperature be 1190~1215 DEG C, final rolling temperature be 940~
960℃；Described to batch in step, coiling temperature is 550~560 DEG C；In the cold continuous rolling step, the original thickness of steel plate is
4.7~5.2mm, the finished product thickness of steel plate is 1.7~2.0mm；In the heat treatment step, the holding temperature of steel plate for 825~
835 DEG C, for the aging temp of steel plate at 410~425 DEG C, it is 20~40 DEG C/s to control cooldown rate, during board briquette≤410 DEG C,
Room temperature is cooled to using the natural type of cooling.
Further, in the vacuum processing step, vacuum is 50~90Pa, vacuum processing time 15min.
Further, in the heating of plate blank step, heating-up temperature is 1260~1265 DEG C.
Further, in the milling step, controlled rolling in two stages, roughing temperature is 1200~1210 DEG C, finish rolling
Temperature is 940~950 DEG C.
Compared with prior art, the present invention has advantages below：
1st, the present invention is using low C and V, Ni, N, Th and Zr microalloying composition design, Optimizing Technical, acquisition etc.
Axle/acicular ferrite+granular pearlite is the structural steel of metallographic structure, and grain size is more than 13.5 grades, wherein content of pearlite in alloy
For 11~13%, ensure that it has excellent comprehensive mechanical property, while there is good welding performance and low-repulsion energy, and
Anti-delayed fracture performance is good, is the preferable selection of high-end vehicle structural steel.
2nd, the present invention uses dispersion-strengtherning technology except with dispersion-strengthened action, while can also refine reinforcing, due to
It is distributed in that ferrite is transgranular and crystal boundary with substantial amounts of dispersed granules, does not reduce its forming property while rigidity is improved, have
Beneficial to the improvement of the comprehensive mechanical property of steel plate.
In summary, dispersion-strengtherning microalloy high strength steel of the invention is compared with the high-strength steel of prior art, production technology
Rationally controllable, comprehensive mechanical property is excellent, has good welding performance and low-repulsion energy, and anti-delayed fracture performance is good
It is good, there is the very strong market competitiveness and wide application prospect.
Brief description of the drawings
Fig. 1 is the transgranular metallographic structure figure of the steel plate ferrite of the embodiment of the present invention 4.
Fig. 2 is the metallographic structure figure of the steel plate ferrite grain boundaries of the embodiment of the present invention 4.
Embodiment
With reference to specific embodiment, the present invention is further illustrated.
The chemical elements in percentage by mass of 1-8 of the embodiment of the present invention and the steel of comparative example is as shown in table 1, surplus be Fe and
Inevitable impurity.
The chemical composition and mass percentage content (wt%) of the various embodiments of the present invention of table 1
Note：Comparative example is V-N microalloy high strength steels of the prior art.
The production method of various embodiments of the present invention comprises the following steps：
Comprise the following steps：Desulfurizing iron, pneumatic steelmaking, application of vacuum, continuous casting, heating of plate blank, roll, batch, pickling,
Cold continuous rolling, heat treatment and finishing；Vacuum and processing time in vacuum processing step be respectively 40~100Pa and 10~
20min；Heating-up temperature in heating of plate blank step is 1255~1275 DEG C；Milling step controls in two stages, roughing and finish rolling
Temperature be respectively 1190~1215 DEG C and 940~960 DEG C；It is 550~560 DEG C to batch the coiling temperature in step；Heat treatment
The holding temperature of steel plate in step is 825~835 DEG C, and for steel plate aging temp at 410~425 DEG C, it is 20 to control cooldown rate
~40 DEG C/s, during board briquette≤410 DEG C, room temperature is cooled to using the natural type of cooling.
The main production parameter of each embodiment is as shown in table 2.
The main technologic parameters list of the various embodiments of the present invention of table 2
The performance parameter of each embodiment and comparative example is as shown in table 3.
The various embodiments of the present invention of table 3 and comparative example performance parameter table
From table 1, the C content of steel of the invention is compared with the V-N microalloys of prior art are high-strength, C content, Si contents
It is relatively low with V content, while appropriate Ni, Th and Zr are added, it is strict to control P and S contents, by technological parameter as shown in table 2
Lean production, the mechanical property reached is as shown in table 3, and as can be seen from Table 3, the combination property of 1~8 high-strength steel of the invention is excellent
High-strength in the V-N microalloys of prior art, specific mechanical performance index is：Yield strength ReLFor 340~360MPa, tensile strength
RmFor 450~470MPa, elongation percentage is 30~32%, and strain hardening exponent n is 0.19~0.21, is met in proof strength actual
While application demand, its welding performance, rebound performance and anti-delayed fracture performance improve a lot, and can be widely applied to vapour
In the making of bassinet structure part and reinforcer；Wherein, the high-strength just ferrite of embodiment 4 is produced dispersion-strengtherning microalloy it is transgranular and
The metallurgical structure of crystal boundary is shown in Fig. 1 and Fig. 2, and its metallographic structure is isometric/acicular ferrite+granular pearlite, can from Fig. 1
To find out, the distribution of disperse uniform ion, size and apart from suitable, transgranular precipitate is V (C, N) and Ni carbide；In Fig. 2
Grain boundary precipitate be Th and Zr minuteness particle.
Above-described embodiment is only the best example, and is not the restriction to embodiments of the present invention.
Other parts not being described in detail are prior art.
Claims (8)
- A kind of 1. dispersion-strengtherning microalloy high strength steel, it is characterised in that：The chemical composition and its percentage by weight of the steel are as follows： C：0.05~0.06%, Si：0.01~0.02%, Mn：0.47~0.53%, Al：0.02~0.05%, P≤0.010%, S≤ 0.006%, V：0.09~0.10%, N：0.007~0.008%, Ni：0.02~0.03%, Th：0.02~0.04%, Zr： 0.012~0.018%, remaining is Fe and inevitable impurity；Its metallographic structure is isometric/acicular ferrite+granular pearlite, And there are a large amount of dispersed granules to separate out, wherein content of pearlite in alloy is 11~13%.
- 2. dispersion-strengtherning microalloy high strength steel according to claim 1, it is characterised in that：The chemical composition of the steel and its Percentage by weight is as follows：C：0.052~0.058%, Si：0.012~0.018%, Mn：0.47~0.53%, Al：0.025~ 0.045%, P≤0.010%, S≤0.006%, V：0.09~0.10%, N：0.007~0.008%, Ni：0.02~ 0.03%, Th：0.025~0.035%, Zr：0.014~0.016%, remaining is Fe and inevitable impurity.
- 3. dispersion-strengtherning microalloy high strength steel according to claim 2, it is characterised in that：The chemical composition of the steel and its Percentage by weight is as follows：C：0.055%, Si：0.015%, Mn：0.49%, Al：0.032%, P：0.005%, S：0.004%, V：0.095%, N：0.0073%, Ni：0.026%, Th：0.028%, Zr：0.0155%, remaining is Fe and inevitable miscellaneous Matter.
- 4. dispersion-strengtherning microalloy high strength steel according to claim 1, it is characterised in that：The mechanical property of the steel is： Yield strength ReLFor 340~360MPa, tensile strength RmFor 450~470MPa, elongation percentage is 30~32%, strain hardening exponent N is 0.19~0.21, and rebound performance and anti-delayed fracture performance are good, has excellent welding performance and shapes performance.
- A kind of 5. production method of the dispersion-strengtherning microalloy high strength steel described in claim 1, it is characterised in that：Including following step Suddenly：Desulfurizing iron, pneumatic steelmaking, application of vacuum, continuous casting, heating of plate blank, roll, batch, pickling, cold continuous rolling, heat treatment and essence It is whole；In the vacuum processing step, vacuum is 40~100Pa, and vacuum processing time is 10~20min；The heating of plate blank In step, heating-up temperature is 1255~1275 DEG C；In the milling step, controlled rolling in two stages, roughing temperature 1190 ~1215 DEG C, final rolling temperature is 940~960 DEG C；Described to batch in step, coiling temperature is 550~560 DEG C；The cold continuous rolling In step, the original thickness of steel plate is 4.7~5.2mm, and the finished product thickness of steel plate is 1.7~2.0mm；The heat treatment step In, the holding temperature of steel plate is 825~835 DEG C, and for the aging temp of steel plate at 410~425 DEG C, it is 20~40 to control cooldown rate DEG C/s, during board briquette≤410 DEG C, room temperature is cooled to using the natural type of cooling.
- 6. the production method of dispersion-strengtherning microalloy high strength steel according to claim 5, it is characterised in that：At the vacuum Manage in step, vacuum is 50~90Pa, vacuum processing time 15min.
- 7. the production method of dispersion-strengtherning microalloy high strength steel according to claim 5, it is characterised in that：The slab adds In hot step, heating-up temperature is 1260~1265 DEG C.
- 8. the production method of dispersion-strengtherning microalloy high strength steel according to claim 5, it is characterised in that：The rolling step In rapid, controlled rolling in two stages, roughing temperature is 1200~1210 DEG C, and final rolling temperature is 940~950 DEG C.
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