CN109402499A - A kind of protection steel and its production method - Google Patents
A kind of protection steel and its production method Download PDFInfo
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- CN109402499A CN109402499A CN201811128250.8A CN201811128250A CN109402499A CN 109402499 A CN109402499 A CN 109402499A CN 201811128250 A CN201811128250 A CN 201811128250A CN 109402499 A CN109402499 A CN 109402499A
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- 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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- 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
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- 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
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses a kind of protection steel and its production method, the ingredient percent of protection steel is C:0.10%~0.20wt%；Si:0.10%-0.60wt%；Mn:0.8%~1.65wt%；Nb:0.02%~0.05wt%；Mo:0.3%~0.8wt%；V:0.05%~0.15wt%；Ti:0.01%~0.05wt%；Al:0.01%~0.06wt%；Cr:0.4%~1.0wt%；B:0.0015%~0.0025wt%；P :≤0.02wt%；S :≤0.01wt%；N :≤0.008wt%, remaining is Fe and inevitable impurity.To solve C, the Mn of shoulder guard in the prior art due to being added to high level, Pcm design is excessively high, welding performance is caused to decline, there are problems that welding cold cracking and weld fatigue cracking, cold formability can be with the poor technical problem of low-temperature impact toughness, realizing protection steel has good cold forming properties and low-temperature impact toughness, improves the technical effect of Protection Product security performance.
Description
Technical field
The present invention relates to metallurgical technology field, in particular to a kind of protection steel and its production method.
Background technique
With quickly propelling for China's " civil-military inosculation " development strategy, the need of military industry field and civil field protection class steel plate
It asks and quicklys increase, developing has the shoulder guard demand of good solderability and favorable low-temperature impact toughness strong.Currently, protection steel
Panel products are mainly used in protection outside plate, armoured van, the safety cabinet of manufacture panzer, cross-country protection vehicle outside plate, the police instrument of army
Deng.
Shoulder guard in the prior art C, Mn due to being added to high level, Pcm design is excessively high, leads to welding performance
, there is welding cold cracking and weld fatigue cracking in decline, cold formability can be asked with the poor technology of low-temperature impact toughness
Topic.
Summary of the invention
The embodiment of the invention provides a kind of protection steel and its production methods, to solve protection steel in the prior art
Plate C, Mn due to being added to high level, Pcm design is excessively high, causes welding performance to decline, there are welding cold crackings and weld seam
The problem of fatigue cracking, cold formability can be with the poor technical problems of low-temperature impact toughness, and realizing protection steel has well
Welding performance, cold forming properties and low-temperature impact toughness, improve the technical effect of Protection Product security performance.
To solve the above-mentioned problems, in a first aspect, the embodiment of the invention provides a kind of protection steel, steel is used in the protection
Ingredient percent be C:0.10%~0.20wt%；Si:0.10%-0.60wt%；Mn:0.8%~1.65wt%；
Nb:0.02%~0.05wt%；Mo:0.3%~0.8wt%；V:0.05%~0.15wt%；Ti:0.01%~0.05wt%；
Al:0.01%~0.06wt%；Cr:0.4%~1.0wt%；B:0.0015%~0.0025wt%；P :≤0.02wt%；S:
≤ 0.01wt%；N :≤0.008wt%, remaining is Fe and inevitable impurity.
Preferably, cooling cracks the susceptible index number Pcm≤0.30 of the ingredient of the protection steel.
Second aspect, the embodiment of the invention provides a kind of production methods of protection steel, which comprises uses steel
Hydrometallurgy refining obtains slab；The slab is heated in heating furnace, the temperature of the slab is 1180~1250 after heating
℃；Roughing and finish rolling are successively carried out to the slab after heating, obtain hot rolled plate；After rolling, to the hot rolled plate into
Row section cooling simultaneously batches, and obtains coil of strip；Slow cooling processing is carried out to the coil of strip using burial pit, and to steel after slow cooling processing
Volume carries out smooth processing；After smooth processing, uncoiling processing is carried out to coil of strip, obtains roll bending, and to the roll bending carry out it is conventional or
High-frequency induction heating and heat preservation, are quenched to room temperature；After quenching, conventional tempering is carried out to roll bending or induction tempering heats and heat preservation,
And it carries out air-cooled or air-cooled to room temperature；To roll bending carry out it is crosscutting, obtain protection steel, wherein the protection steel at sub-prime
Amount percentage is C:0.10%~0.20wt%；Si:0.10%-0.60wt%；Mn:0.8%~1.65wt%；Nb:0.02%
~0.05wt%；Mo:0.3%~0.8wt%；V:0.05%~0.15wt%；Ti:0.01%~0.05wt%；Al:0.01%
~0.06wt%；Cr:0.4%~1.0wt%；B:0.0015%~0.0025wt%；P :≤0.02wt%；S :≤
0.01wt%；N :≤0.008wt%, remaining is Fe and inevitable impurity.
Preferably, the soaking time of the slab is controlled according to the effective thickness of the slab in 1~1.5min/mm range
Interior setting.
Preferably, the slab after described pair of heating successively carries out roughing and finish rolling, obtains hot rolled plate, comprising: in institute
Workpiece thickness after stating roughing is 5 times~10 times of the hot rolling plate thickness after the finish rolling；The entry temperature at finishing
It is 1000 DEG C~1100 DEG C, finishing temperature is 800~880 DEG C.
Preferably, the coiling temperature batched is 650 DEG C~750 DEG C, the thickness specification of the coil of strip be 2mm~
12mm。
Preferably, the slow cooling time of the slow cooling processing is greater than 72 hours, and the temperature that the coil of strip enters the burial pit is big
In 450 DEG C, and whole cool time is the time that the control coil of strip slow cooling temperature is lower than 150 DEG C.
Preferably, after the smooth processing, uncoiling processing is carried out to coil of strip, obtains roll bending, and the roll bending is carried out normal
Rule or high-frequency induction heating and heat preservation, are quenched to room temperature, comprising: and the heating temperature of the high-frequency induction heating is 900-950 DEG C,
The rate of heat addition is greater than 150 DEG C/s, and soaking time is less than 10min；The heating temperature of the conventional heating is 900-950 DEG C, heat preservation
Time is 20-30min；The quenching uses water quenching.
Preferably, after the quenching, conventional tempering is carried out to roll bending or induction tempering heats and heat preservation, and carry out it is air-cooled or
It is air-cooled to room temperature, comprising: the heating temperature of induction tempering heating is 500-650 DEG C, and the rate of heat addition is greater than 150 DEG C/s, is protected
The warm time is less than 20min；The heating temperature of the conventional tempering heating is 450-650 DEG C, soaking time 30-50min.
Preferably, the smooth elongation percentage of the smooth processing is greater than 1.5%.
Said one or multiple technical solutions in the embodiment of the present invention at least have following one or more technology effects
Fruit:
The embodiment of the invention provides a kind of production methods of protection steel, which comprises is obtained using smelting molten steel
Obtain slab；The slab is heated in heating furnace, the temperature of the slab is 1180~1250 DEG C after heating；To heating
The slab afterwards successively carries out roughing and finish rolling, obtains hot rolled plate；After rolling, section cooling is carried out to the hot rolled plate
And batch, obtain coil of strip；Slow cooling processing is carried out to the coil of strip using burial pit, and smooth to coil of strip progress after slow cooling processing
Processing；After smooth processing, uncoiling processing is carried out to coil of strip, obtains roll bending, and add to roll bending progress routine or high-frequency induction
Heat and heat preservation, are quenched to room temperature；After quenching, conventional tempering is carried out to roll bending or induction tempering heats and heat preservation, and is carried out air-cooled
Or it is air-cooled to room temperature；Roll bending is carried out crosscutting, obtains protection steel, wherein the ingredient percent of protection steel is
C:0.10%~0.20wt%；Si:0.10%-0.60wt%；Mn:0.8%~1.65wt%；Nb:0.02%~0.05wt%；
Mo:0.3%~0.8wt%；V:0.05%~0.15wt%；Ti:0.01%~0.05wt%；Al:0.01%~0.06wt%；
Cr:0.4%~1.0wt%；B:0.0015%~0.0025wt%；P :≤0.02wt%；S :≤0.01wt%；N :≤
0.008wt%, remaining is Fe and inevitable impurity.By the control to slab heating temperature, the effective of slab ensure that
Thickness is conducive to refine crystal grain；Slab is rolled and carries out cooling and is batched, is conducive to reinforce the build up after phase transformation, also have
Conducive to enhancing precipitating reinforcing effect；And then coil of strip is handled using slow cooling, keep the logical volume mechanical property of material more uniform, and can
Be effectively released internal stress and homogenize, so as to improve strip shape quality, is conducive to subsequent heat treatment plate shape and remnants are answered
The control of power；After carrying out smooth and uncoiling processing to coil of strip again, routine or high-frequency induction heating and heat preservation are carried out to roll bending, can be mentioned
The high rate of heat addition is conducive to quenching and obtains more tiny martensite and lath of bainite, and is conducive to control carbon in quenching structure
Compound pattern；After roll bending quenching, conventional tempering is carried out to roll bending or induction tempering heats and heat preservation, improves the intensity of material,
Be conducive to control material unevenness and guarantee blanking after it is indeformable；It is available tiny, equal by the restriction to steel component
Even tempered structure realizes technical effect of the protection steel with good obdurability, welding performance and low-temperature impact toughness.
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And it can be implemented in accordance with the contents of the specification, and in order to allow above and other objects of the present invention, feature and advantage can
It is clearer and more comprehensible, the followings are specific embodiments of the present invention.
Detailed description of the invention
Fig. 1 is the metallographic structure schematic diagram that steel is used in protection in the embodiment of the present invention；
Fig. 2 is the flow chart of the production method of protection steel in the embodiment of the present invention.
Specific embodiment
The embodiment of the invention provides a kind of protection steel and its production methods, to solve protection steel in the prior art
Plate C, Mn due to being added to high level, Pcm design is excessively high, causes welding performance to decline, there are welding cold crackings and weld seam
The problem of fatigue cracking, cold formability can be with the poor technical problems of low-temperature impact toughness, and realizing protection steel has well
Welding performance, cold forming properties and low-temperature impact toughness, improve the technical effect of Protection Product security performance.
In technical solution in the embodiment of the present invention, the ingredient percent of protection steel be C:0.10%~
0.20wt%；Si:0.10%-0.60wt%；Mn:0.8%~1.65wt%；Nb:0.02%~0.05wt%；Mo:0.3%~
0.8wt%；V:0.05%~0.15wt%；Ti:0.01%~0.05wt%；Al:0.01%~0.06wt%；Cr:0.4%~
1.0wt%；B:0.0015%~0.0025wt%；P :≤0.02wt%；S :≤0.01wt%；N :≤0.008wt%, remaining is
Fe and inevitable impurity.To solve C, the Mn of shoulder guard in the prior art due to being added to high level, Pcm is set
Count excessively high, welding performance caused to decline, there are problems that welding cold cracking and weld fatigue cracking, cold formability can and low temperature punching
The poor technical problem of toughness is hit, realizing protection steel has good welds performance, cold forming properties and low-temperature impact toughness,
Improve the technical effect of Protection Product security performance.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Embodiment one
The embodiment of the invention provides a kind of protection steel, referring to FIG. 1, the protection ingredient percent of steel
For C:0.10%~0.20wt%；Si:0.10%-0.60wt%；Mn:0.8%~1.65wt%；Nb:0.02%~
0.05wt%；Mo:0.3%~0.8wt%；V:0.05%~0.15wt%；Ti:0.01%~0.05wt%；Al:0.01%~
0.06wt%；Cr:0.4%~1.0wt%；B:0.0015%~0.0025wt%；P :≤0.02wt%；S :≤0.01wt%；
N :≤0.008wt%, remaining is Fe and inevitable impurity.
Further, a part of ingredient percent of protection steel is C:0.13~0.20wt%, Mn:1.0
~1.5wt%, Nb:0.03~0.04wt%, Ti:0.01~0.03wt%, Mo:0.3~0.5wt%, V:0.06~
0.10wt%, Cr:0.5~1.0wt%, B:0.0015~0.0020wt%.
Further, a part of ingredient percent of protection steel is C:0.15~0.18wt%, Mn:1.2
~1.6wt%, Nb:0.02~0.03wt%, Ti:0.02~0.04wt%, Mo:0.35~0.65wt%, V:0.05~
0.13wt%, Cr:0.55~0.08wt%, B:0.0016~0.0022wt%.
Specifically, the protection is played a significant role in heat treatment high-strength steel with C in steel, on the one hand pass through addition C
It is remarkably improved the intensity of material, but low-temperature impact toughness and solderability to guarantee material, needs to do the upper limit of C content bright
Fidelity is fixed, and the C content that the embodiment of the present application uses is 0.10~0.20wt%.Si is solution strengthening element, but is added excessively high
Si can have a negative impact to the plasticity of material.It is 0.10-0.60wt% that the embodiment of the present application, which adds silicone content,.Mn has solid solution
Invigoration effect, while material harden ability can be improved, it is to improve one of strength of materials important element, but manganese content addition is excessively high easy
It generates and is segregated and can reduce toughness of material, deteriorate performance.It is 0.8~1.65wt% that the embodiment of the present application, which adds manganese content,.S and P
Constituent content is excessively high to adversely affect toughness of material and plasticity.The embodiment of the present application defines that sulfur content should control
Within 0.01wt%, phosphorus content should be controlled within 0.02wt%.Al is deoxidant element, while having certain crystal grain refinement effect
Fruit.The embodiment of the present application defines that aluminium content is 0.01~0.06wt%.Material harden ability, control heat treatment cooling can be improved in Mo
Tissue refines crystal grain, improves material plasticity and intensity.The embodiment of the present application Mo is added to 0.3~0.8wt%, improves tissue
Strengthen performance.The main purpose of Nb is refinement crystal grain, and fine uniform can be obtained using lower finish rolling area rolling temperature in cooperation
Ferrite crystal grain, heat treatment base-material fine microstructures have genetic effect to subsequent heat treatment, are conducive to improve final finished steel plate
Obdurability；On the other hand, the present embodiment uses higher tempering temperature, and Nb has precipitation strength effect simultaneously.This implementation
The Nb content of example addition is 0.02~0.05wt%.The main function of Ti is fixed nitrogen, reduces the N to dissociate in steel by forming TiN,
Improve materials'use performance；In addition, extra Ti in conjunction with C, plays the role of precipitation strength, but the precipitation strength of TiC can be to material
The low-temperature impact toughness of material causes damages, therefore need to control the upper limit of Ti content.The addition of the present embodiment Ti content: 0.01~
0.05wt%.V is the important alloying element designed in the embodiment of the present application, the addition of high V content, the coiling temperature and heat of hot rolling
The tempering temperature of processing considers the precipitation strength and tissue thinning effect of V element.The present embodiment addition 0.05~
The V of 0.15wt% carries out microalloying, cooperates suitable production technology, and a large amount of small and dispersed distributions have been obtained in hot-rolled coil
V precipitate, the precipitate that V is further precipitated during tempering heat treatment greatly improves the strength level of material.This reality
Apply Cr in example is reduced the additive amount of Mn by addition Cr, mitigates center to improve material harden ability and improving strength of materials element
Segregation and banded structure, the content that Cr is added in the present embodiment is 0.4~1.0wt%.The purpose of B is to improve the through hardening of material
Property, intensity is improved, but needs the additional amount of strict control B, toughness is avoided to decline, B addition 0.0015 in the embodiment of the present application~
0.0025wt%.The plasticity and toughness of the excessively high meeting severe exacerbation material of N content, especially for heat treatment high-strength steel, therefore, this
Application embodiment, which limits nitrogen content, should be less than 0.008wt%.Surplus other than mentioned component is Fe and inevitable impurity.It is excellent
A part of ingredient percent of selection of land, protection steel is C:0.13~0.20wt%, Mn:1.0~1.5wt%, Nb:
0.03~0.04wt%, Ti:0.01~0.03wt%, Mo:0.3~0.5wt%, V:0.06~0.10wt%, Cr:0.5~
1.0wt%, B:0.0015~0.0020wt%.Or a part of ingredient percent of protection steel be C:0.15~
0.18wt%, Mn:1.2~1.6wt%, Nb:0.02~0.03wt%, Ti:0.02~0.04wt%, Mo:0.35~
0.65wt%, V:0.05~0.13wt%, Cr:0.55~0.08wt%, B:0.0016~0.0022wt%.The embodiment of the present application
Using a kind of middle low-carbon alloy component system: lower carbon and manganese content makes full use of the precipitating reinforcing effect of V, add Nb and
Using suitable controlling of production process structure refinement degree, while a certain amount of Mo, Cr, B control heat-treated sturcture state is added,
Tiny, uniform tempered structure is obtained, so that material has good obdurability, good welding performance and good low
Warm impact flexibility, solve shoulder guard in the prior art cold formability can it is poor, low-temperature impact toughness is poor, solderability difference etc. is asked
Topic.Using shoulder guard provided by the invention, can realize bending and forming and it is welding simultaneously, guarantee shoulder guard have-
40 DEG C of low-temperature impact toughness and the weld seam target practice performance of qualification.
Further, cooling cracks the susceptible index number Pcm≤0.30 of the ingredient of the protection steel.
Specifically, the embodiment of the present application by limit the cooling cracks the susceptible index number Pcm of the protection ingredient of steel≤
0.30, it is ensured that welding cold cracking does not occur in subsequent welding process in shoulder guard, and improves the synthesis of welding heat affected zone
Performance.
Embodiment two
A kind of production method of protection steel is present embodiments provided, referring to FIG. 2, the described method includes:
Step 110: slab is obtained using smelting molten steel.
Step 120: the slab being heated in heating furnace, the temperature of the slab is 1180~1250 after heating
℃。
Further, the soaking time of the slab, which is pressed, controls the effective thickness of slab within the scope of 1~1.5min/mm
Setting.
Specifically, the embodiment of the present application obtains slab to smelting molten steel using method of smelting such as converters, by the slab
It heats in heating furnace, the temperature of the slab is 1180~1250 DEG C after heating.The soaking time of the slab is pressed will
The effective thickness control of slab is arranged within the scope of 1~1.5min/mm, is to guarantee using the purpose of higher heating temperature difficult to understand
The compound of Ti, Nb for being formed in family name's body homogenization and alloying element such as slab dissolve more abundant.
Step 130: roughing and finish rolling successively being carried out to the slab after heating, obtain hot rolled plate.
Further, the slab after described pair of heating successively carries out roughing and finish rolling, obtains hot rolled plate, comprising:
Workpiece thickness after the roughing is 5 times~10 times of the hot rolling plate thickness after the finish rolling；The finish rolling entrance temperature
Degree is 1000 DEG C~1100 DEG C, and finishing temperature is 800~880 DEG C.
Specifically, the embodiment of the present application is rolled using two-stage control, the slab after heating is successively carried out thick
It rolls and finish rolling guarantees in 5 times~10 times that the workpiece thickness after the roughing is the hot rolling plate thickness after the finish rolling
With enough austenite Unhydrated cement drafts, can contract while being conducive to refine crystal grain, and increase workpiece thickness
Base length between brachymedial prevents tail temperature from reducing excessive increase mill load to reduce poor into finish rolling head and tail temperature.Finish rolling
Journey need to be 1000 DEG C~1100 DEG C according to finished product thickness specification strict control entry temperature at finishing, and finishing temperature is 800~880
DEG C, it is to obtain the effective ways of fine uniform crystal grain using lower finish rolling area temperature, avoids hot-rolled coil organizational coarseness and band
The appearance of shape tissue.
Step 140: after rolling, the hot rolled plate using section cooling and being batched, obtains coil of strip.
Further, the coiling temperature batched is 650 DEG C~750 DEG C, the thickness specification of the coil of strip be 2mm~
12mm。
Specifically, carrying out section cooling after rolling using leading portion refrigerating mode to the hot rolled plate, being conducive to add
Build up after strong phase transformation, and be conducive to enhance precipitating reinforcing effect, the tiny precipitation product in more ferrites is obtained, from
And effectively improve the strength of materials.Controlling the coiling temperature batched is 650 DEG C~750 DEG C, is mainly in view of the alternate analysis of V, Nb, Ti
Precipitation out and in ferrite, coiling temperature lower limit need strict control to be greater than 650 DEG C, avoid occurring bayesian in hot-rolled coil
Body tissue, to obtain coil of strip, the thickness specification of the coil of strip is 2mm~12mm.
Step 150: slow cooling processing being carried out to the coil of strip using burial pit, and smooth to coil of strip progress after slow cooling processing
Processing.
Further, the slow cooling time of the slow cooling processing is greater than 72 hours, and the coil of strip enters the temperature of the burial pit
Greater than 450 DEG C, and whole cool time is the time for controlling coil of strip slow cooling temperature and being lower than 150 DEG C.
Specifically, carrying out slow cooling processing, the slow cooling time of the slow cooling processing to the coil of strip after offline using burial pit
Greater than 72 hours, wherein the temperature that the coil of strip enters the burial pit is greater than 450 DEG C, and whole cool time is control coil of strip slow cooling
Temperature is lower than 150 DEG C of time.Slow cooling is carried out to coil of strip using burial pit, the logical volume mechanical property of material can be made more equal
It is even, and so that internal stress is released and is homogenized, so as to improve strip shape quality, be conducive to subsequent heat treatment plate shape and
The control of residual stress.Smooth processing is carried out to coil of strip after slow cooling processing, wave is eliminated, need to guarantee that smooth elongation percentage is greater than
1.5%.
Step 160: after smooth processing, uncoiling processing is carried out to coil of strip, obtains roll bending, and to the roll bending carry out it is conventional or
High-frequency induction heating and heat preservation, are quenched to room temperature.
Further, the heating temperature of the high-frequency induction heating is 900-950 DEG C, and the rate of heat addition is greater than 150 DEG C/S, is protected
The warm time is less than 10min；The heating temperature of the conventional heating is 900-950 DEG C, soaking time 20-30min；The quenching
Using water quenching.
Further, the smooth elongation percentage of the smooth processing is greater than 1.5%.
Specifically, carrying out uncoiling processing to coil of strip after smooth processing, roll bending is obtained, and the roll bending is carried out conventional
Or high-frequency induction heating, the heating temperature of the high-frequency induction heating are 900-950 DEG C, the rate of heat addition is greater than 150 DEG C/s, uses
The purpose of high-frequency induction heating is control quenched martensite tissue topography, and the raising rate of heat addition is conducive to quenching and obtains more refinement
Small martensite and lath of bainite, and be conducive to control morphology of carbides in quenching structure.And conventional heating mode is used, it needs
Want 900-950 DEG C of fed to boiler of furnace temperature appreciation.The coil of strip after heating is kept the temperature, soaking time is small after high-frequency induction heating
In 10 minutes, the purpose for controlling soaking time was the carbide dissolution for preventing V, Ti, Nb in hot-rolled coil, and reduced austenite
Crystallite dimension；Conventional heating is to keep austenite more uniform, soaking time 20-30 minutes.It quenches coil of strip after heating and thermal insulation
Fire processing, using water quenching, target temperature is room temperature, and tiny martensite and bainite structure can be obtained after quenching.
Step 170: after quenching, conventional tempering being carried out to roll bending or induction tempering heats and heat preservation, and carries out air-cooled or wind
It is cooled to room temperature；
Further, the heating temperature of the induction tempering heating is 500-650 DEG C, and the rate of heat addition is greater than 150 DEG C/s, protects
The warm time is less than 20min；The heating temperature of the conventional tempering heating is 450-650 DEG C, soaking time 30-50min.
Specifically, carrying out tempering heating to the coil of strip after quenching, heating temperature for high-frequency induction is 500-650 DEG C, is added
Hot rate is greater than 150 DEG C/s, is to control cementite pattern using the purpose that high-frequency induction quickly heats；High-frequency induction is tempered
Coil of strip is kept the temperature after heating, and soaking time is less than 20min, by quickly heat with strict control soaking time, can be obtained thin
The small cementite being discontinuously distributed, simultaneously because use higher tempering temperature, V, Nb, Ti existing for solid solution mode will be into steel
One step is precipitated, and improves the intensity of material.Such as using conventional tempering heating, holding temperature is set as 450-600 DEG C, and furnace temperature rises to mesh
Temperature fed to boiler is marked, soaking time 30-50min is to ensure that structural transformation is abundant and completion is precipitated.Using 450-650 DEG C of high temperature
Tempering, at the same be conducive to eliminate steel plate residual stress, be conducive to control material unevenness and guarantee blanking after it is indeformable.
Step 180: crosscutting, acquisition protection steel is carried out to roll bending, wherein the protection ingredient percent of steel
For C:0.10%~0.20wt%；Si:0.10%-0.60wt%；Mn:0.8%~1.65wt%；Nb:0.02%~
0.05wt%；Mo:0.3%~0.8wt%；V:0.05%~0.15wt%；Ti:0.01%~0.05wt%；Al:0.01%~
0.06wt%；Cr:0.4%~1.0wt%；B:0.0015%~0.0025wt%；P :≤0.02wt%；S :≤0.01wt%；
N :≤0.008wt%, remaining is Fe and inevitable impurity.
Specifically, carrying out welding after carrying out laser, plasma or fiery cut blanking to the roll bending and protection use being made
Steel, the ingredient percent for controlling protection steel is C:0.10%~0.20wt%；Si:0.10%-0.60wt%；
Mn:0.8%~1.65wt%；Nb:0.02%~0.05wt%；Mo:0.3%~0.8wt%；V:0.05%~0.15wt%；
Ti:0.01%~0.05wt%；Al:0.01%~0.06wt%；Cr:0.4%~1.0wt%；B:0.0015%~
0.0025wt%；P :≤0.02wt%；S :≤0.01wt%；N :≤0.008wt%, remaining is Fe and inevitable impurity.
Low C, low Mn, high V ingredient mentality of designing in the embodiment of the present application use give full play to the reinforcings such as build up, precipitation strength effect
Fruit produces protection steel, has good formability and low-temperature impact toughness, can be used for producing shellproof military vehicle, shield, fortune
Paper money vehicle etc. can guarantee the protective performance of position while welding under the premise of guaranteeing base material protective performance safety.It is raw by the method for the present invention
The material yield strength of output is greater than 1000MPa, stretches rate greater than 12%, -40 DEG C of ballistic works are greater than 60J, 180 ° of clod wash B=
35mm/D=3a does not crack, and material has good welding performance and fatigue behaviour simultaneously.
Embodiment three
Present embodiments provide a kind of production method of protection steel, the method uses 220 tons of converter smeltings, 1580 or
2250 hot continuous rolling production lines are rolled, and protection is 1500mm with the target width of steel finished product, with a thickness of 2-12mm, the present embodiment
Specific step is as follows:
Molten steel obtains slab after converter smelting；Smelting process strict control P, S content guarantees slab quality.It smelts
Protection steel chemical composition is as shown in table 1.Table 1 lists the protection steel chemical composition in the embodiment of the present application.
Steel chemical composition is used in the protection of table 1
Slab is put into heating furnace to heat, the slab after heating is put into milling train and is rolled, obtains hot rolled plate.It is right
Hot rolled plate is cooled down, and carries out section cooling using leading portion refrigerating mode, hot rolled plate after cooling is batched, obtain steel
Volume carries out slow cooling processing using burial pit to the coil of strip, slow cooling soaking time 72 hours, cheats temperature control out at 100 DEG C.It is right
Coil of strip carries out smooth processing after slow cooling, and smooth elongation percentage reaches 1.5%.Uncoiling processing is carried out to the coil of strip, obtains roll bending, it is right
Roll bending carries out continuous high frequency induction heating and heat preservation and conventional heating and heat preservation, then water quenching to room temperature.To roll bending after quenching into
Row high-frequency induction tempering heating and heat preservation or conventional tempering and heat preservation, after be air-cooled to room temperature.Crosscutting, acquisition is carried out to the coil of strip
Steel is used in the protection.The specific control parameter of above-mentioned production stage is as shown in table 2.Table 2 lists the protection steel in restriction
Ten groups of component content production protection steel processing parameters are chosen in ingredient.
The protection steel processing parameter of table 2
The mechanical property of the 1000MPa protection steel obtained by above-mentioned technique is as shown in table 3.Table 3, which lists, to be limited
Protection steel ingredient in choose ten groups of component contents production protection steel mechanical property parameters.
The protection steel mechanical property parameter of table 3
The finished steel plate finally obtained through this embodiment, after carrying out laser, plasma or fiery cut blanking, for various
The manufacture of shellproof instrument, bullet-proof vehicle outside plate.Through testing, due to being controlled using higher temperature, the protection is cut down with steel
Without deformation after material, good weldability, preheated weld does not generate cold crack.Meanwhile the protection with steel have it is good it is cold at
Shape performance can be used for various bending and formings of the bending technique within 180 ° of D=3a, and for production protector tool or vehicle, provide can
Select steel.In addition, described have excellent protective performance with steel, different thickness is selected according to degree of protection difference, can reach
Protective performance requirement of the level of protection such as national military standard, police standard, American Standard, Europe superscript to plate.It is provided in an embodiment of the present invention anti-
Shield, by the ratio of chemical component in reasonably optimizing steel, is given full play to the strengthening effects such as build up, precipitation strength, made most with steel
The steel plate finished product obtained eventually has good intensity, toughness, welding performance, cold formability energy and strip shape quality.Further,
Protection provided by the invention low C, low Mn, high V, basic ideas that Cr strengthens in middle Mo in steel production method, sternly
Lattice control the content of P, S in smelting process, and controlled rolling and cooling process parameter is rationally arranged in rolling and heat treatment process, protect
Demonstrate,proving steel plate finished product has good structural state, and effectively controls precipitate state, effectively improves the synthesis of protection steel
Mechanical property；Wherein, the addition of V solves that heat-treated steel plate plate shape while obtaining high-intensitive is poor, forming difficulty, weldability
Can difference problem, protection hardness of steel made from the production method reaches 1000MPa or more, while ratio elongation percentage is greater than
11%, and can guarantee that low-temperature impact toughness reaches E step requirement, clod wash D=3a 180 ° wide does not crack.Protection produced by the invention
Steel plate is suitable for the manufacture of a variety of protection applications products, due to good solderability, cold formability and low-temperature impact toughness,
It suitable for bending and forming and welding welding, can be used for manufacturing bullet-proof car outside plate, be suitable for extremely cold area and use.
The technical solution provided in the embodiment of the present application, has at least the following technical effects or advantages:
The embodiment of the invention provides a kind of production methods of protection steel, which comprises is obtained using smelting molten steel
Obtain slab；The slab is heated in heating furnace, the temperature of the slab is 1180~1250 DEG C after heating；To heating
The slab afterwards successively carries out roughing and finish rolling, obtains hot rolled plate；After rolling, section cooling is carried out to the hot rolled plate
And batch, obtain coil of strip；Slow cooling processing is carried out to the coil of strip using burial pit, and smooth to coil of strip progress after slow cooling processing
Processing；After smooth processing, uncoiling processing is carried out to coil of strip, obtains roll bending, and add to roll bending progress routine or high-frequency induction
Heat and heat preservation, are quenched to room temperature；After quenching, conventional tempering is carried out to roll bending or induction tempering heats and heat preservation, and is carried out air-cooled
Or it is air-cooled to room temperature；Roll bending is carried out crosscutting, obtains protection steel, wherein the ingredient percent of protection steel is
C:0.10%~0.20wt%；Si:0.10%-0.60wt%；Mn:0.8%~1.65wt%；Nb:0.02%~0.05wt%；
Mo:0.3%~0.8wt%；V:0.05%~0.15wt%；Ti:0.01%~0.05wt%；Al:0.01%~0.06wt%；
Cr:0.4%~1.0wt%；B:0.0015%~0.0025wt%；P :≤0.02wt%；S :≤0.01wt%；N :≤
0.008wt%, remaining is Fe and inevitable impurity.By the control to slab heating temperature, the effective of slab ensure that
Thickness is conducive to refine crystal grain；Slab is rolled and carries out cooling and is batched, is conducive to reinforce the build up after phase transformation, also have
Conducive to enhancing precipitating reinforcing effect；And then coil of strip is handled using slow cooling, keep the logical volume mechanical property of material more uniform, and can
Be effectively released internal stress and homogenize, so as to improve strip shape quality, is conducive to subsequent heat treatment plate shape and remnants are answered
The control of power；After carrying out smooth and uncoiling processing to coil of strip again, routine or high-frequency induction heating and heat preservation are carried out to roll bending, can be mentioned
The high rate of heat addition is conducive to quenching and obtains more tiny martensite and lath of bainite, and is conducive to control carbon in quenching structure
Compound pattern；After roll bending quenching, conventional tempering is carried out to roll bending or induction tempering heats and heat preservation, improves the intensity of material,
Be conducive to control material unevenness and guarantee blanking after it is indeformable；It is available tiny, equal by the restriction to steel component
Even tempered structure realizes technical effect of the protection steel with good obdurability, welding performance and low-temperature impact toughness.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications can be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, those skilled in the art can carry out various modification and variations without departing from this hair to the embodiment of the present invention
The spirit and scope of bright embodiment.In this way, if these modifications and variations of the embodiment of the present invention belong to the claims in the present invention
And its within the scope of equivalent technologies, then the present invention is also intended to include these modifications and variations.
Claims (10)
1. it is a kind of protection use steel, which is characterized in that the ingredient percent of protection steel be C:0.10%~
0.20wt%；Si:0.10%-0.60wt%；Mn:0.8%~1.65wt%；Nb:0.02%~0.05wt%；Mo:0.3%~
0.8wt%；V:0.05%~0.15wt%；Ti:0.01%~0.05wt%；Al:0.01%~0.06wt%；Cr:0.4%~
1.0wt%；B:0.0015%~0.0025wt%；P :≤0.02wt%；S :≤0.01wt%；N :≤0.008wt%, remaining is
Fe and inevitable impurity.
2. protection steel as described in claim 1, which is characterized in that the cooling cracks the susceptible index number of the ingredient of the protection steel
Pcm≤0.30。
3. the production method that steel is used in a kind of protection, which is characterized in that the described method includes:
Slab is obtained using smelting molten steel；
The slab is heated in heating furnace, the temperature of the slab is 1180~1250 DEG C after heating；
Roughing and finish rolling are successively carried out to the slab after heating, obtain hot rolled plate；
After rolling, section cooling is carried out to the hot rolled plate and is batched, coil of strip is obtained；
Slow cooling processing is carried out to the coil of strip using burial pit, and smooth processing is carried out to coil of strip after slow cooling processing；
After smooth processing, uncoiling processing is carried out to coil of strip, obtains roll bending, and routine or high-frequency induction heating are carried out to the roll bending
And heat preservation, it is quenched to room temperature；
After quenching, conventional tempering is carried out to roll bending or induction tempering heats and heat preservation, and is carried out air-cooled or air-cooled to room temperature；
To roll bending carry out it is crosscutting, obtain protection steel, wherein the ingredient percent of protection steel be C:0.10%~
0.20wt%；Si:0.10%-0.60wt%；Mn:0.8%~1.65wt%；Nb:0.02%~0.05wt%；Mo:0.3%~
0.8wt%；V:0.05%~0.15wt%；Ti:0.01%~0.05wt%；Al:0.01%~0.06wt%；Cr:0.4%~
1.0wt%；B:0.0015%~0.0025wt%；P :≤0.02wt%；S :≤0.01wt%；N :≤0.008wt%, remaining is
Fe and inevitable impurity.
4. method as claimed in claim 3, which is characterized in that the soaking time of the slab according to the slab effective thickness
Degree control is arranged within the scope of 1~1.5min/mm.
5. method as claimed in claim 3, which is characterized in that the slab after described pair of heating successively carries out roughing and essence
It rolls, obtains hot rolled plate, comprising:
In 5 times~10 times that the workpiece thickness after the roughing is the hot rolling plate thickness after the finish rolling；
The entry temperature at finishing is 1000 DEG C~1100 DEG C, and finishing temperature is 800~880 DEG C.
6. method as claimed in claim 3, which is characterized in that the coiling temperature batched is 650 DEG C~750 DEG C, described
The thickness specification of coil of strip is 2mm~12mm.
7. method as claimed in claim 3, which is characterized in that the slow cooling time of the slow cooling processing is greater than 72 hours, described
The temperature that coil of strip enters the burial pit is greater than 450 DEG C, and whole cool time be the control coil of strip slow cooling temperature be lower than 150 DEG C when
Between.
8. production method as claimed in claim 3, which is characterized in that after the smooth processing, uncoiling processing is carried out to coil of strip,
Roll bending is obtained, and routine or high-frequency induction heating and heat preservation are carried out to the roll bending, is quenched to room temperature, comprising:
The heating temperature of the high-frequency induction heating is 900-950 DEG C, and the rate of heat addition is greater than 150 DEG C/s, and soaking time is less than
10min；
The heating temperature of the conventional heating is 900-950 DEG C, soaking time 20-30min；
The quenching uses water quenching.
9. production method as claimed in claim 3, which is characterized in that after the quenching, carry out conventional tempering or sense to roll bending
It should be tempered heating and heat preservation, and carried out air-cooled or air-cooled to room temperature, comprising:
The heating temperature of the induction tempering heating is 500-650 DEG C, and the rate of heat addition is greater than 150 DEG C/s, and soaking time is less than
20min；
The heating temperature of the conventional tempering heating is 450-650 DEG C, soaking time 30-50min.
10. production method as claimed in claim 3, which is characterized in that the smooth elongation percentage of the smooth processing is greater than
1.5%.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020239671A1 (en) * | 2019-05-27 | 2020-12-03 | Salzgitter Flachstahl Gmbh | Method for producing a welded component made of a deformed high-strength steel, and component produced in this manner |
| CN114182174A (en) * | 2021-11-26 | 2022-03-15 | 湖南华菱湘潭钢铁有限公司 | Production method of high-toughness bridge structural steel plate |
| CN114645197A (en) * | 2022-02-25 | 2022-06-21 | 山东钢铁集团日照有限公司 | Special steel for composite reinforced protection and manufacturing method thereof |
| CN114657458A (en) * | 2022-02-18 | 2022-06-24 | 山东钢铁集团日照有限公司 | Crude oil storage tank steel plate for large-thickness high-strength high-toughness high-heat input welding and preparation method thereof |
| CN115198165A (en) * | 2022-06-17 | 2022-10-18 | 首钢集团有限公司 | Method for reducing banded structure of 980 MPa-grade cold-rolled high-strength steel |
| RU2790144C1 (en) * | 2019-05-27 | 2023-02-14 | Зальцгиттер Флахшталь Гмбх | Method for manufacture of welded part of molded high-strength steel and part made by such a method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105543666A (en) * | 2015-12-30 | 2016-05-04 | 首钢总公司 | Automobile beam steel with 960 MPa yield strength and production method thereof |
-
2018
- 2018-09-27 CN CN201811128250.8A patent/CN109402499A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105543666A (en) * | 2015-12-30 | 2016-05-04 | 首钢总公司 | Automobile beam steel with 960 MPa yield strength and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020239671A1 (en) * | 2019-05-27 | 2020-12-03 | Salzgitter Flachstahl Gmbh | Method for producing a welded component made of a deformed high-strength steel, and component produced in this manner |
| CN114174542A (en) * | 2019-05-27 | 2022-03-11 | 德国沙士基达板材有限公司 | Method for producing welded components from formed high-strength steel and component for this purpose |
| US20220266389A1 (en) * | 2019-05-27 | 2022-08-25 | Salzgitter Flachstahl Gmbh | Method for producing a welded component made of a deformed high-strength steel, and component produced in this manner |
| RU2790144C1 (en) * | 2019-05-27 | 2023-02-14 | Зальцгиттер Флахшталь Гмбх | Method for manufacture of welded part of molded high-strength steel and part made by such a method |
| CN114182174A (en) * | 2021-11-26 | 2022-03-15 | 湖南华菱湘潭钢铁有限公司 | Production method of high-toughness bridge structural steel plate |
| CN114657458A (en) * | 2022-02-18 | 2022-06-24 | 山东钢铁集团日照有限公司 | Crude oil storage tank steel plate for large-thickness high-strength high-toughness high-heat input welding and preparation method thereof |
| CN114645197A (en) * | 2022-02-25 | 2022-06-21 | 山东钢铁集团日照有限公司 | Special steel for composite reinforced protection and manufacturing method thereof |
| CN114645197B (en) * | 2022-02-25 | 2023-02-28 | 山东钢铁集团日照有限公司 | Special steel for composite reinforced protection and manufacturing method thereof |
| CN115198165A (en) * | 2022-06-17 | 2022-10-18 | 首钢集团有限公司 | Method for reducing banded structure of 980 MPa-grade cold-rolled high-strength steel |
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