CN107513662A - Save the production method of cold forming high intensity steel S700MC low strengths - Google Patents
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- CN107513662A CN107513662A CN201710807367.8A CN201710807367A CN107513662A CN 107513662 A CN107513662 A CN 107513662A CN 201710807367 A CN201710807367 A CN 201710807367A CN 107513662 A CN107513662 A CN 107513662A
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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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- 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
- 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
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses a kind of heat treatment method for saving cold forming high intensity steel S700MC low strengths, the production method includes smelting, continuous casting, heating, rolling, cools down, batches, opening flat, tempering heat treatment process；Because the fluctuation of hot-rolled process coiling temperature is larger, the precipitation of microalloying compound is had a strong impact on, has reduced precipitation strength action effect, has caused yield strength and tensile strength, particularly yield strength to reduce.The present invention passes through tempering heat treatment, effectively increase cold forming high strength steel S700MC yield strengths and tensile strength while improve processability, reduce residual stress, solve the problems, such as that reaping hook deforms when machine cuts and gas flame cuttiug, more importantly solve cold forming high strength steel mechanical property and impact property instability problem caused by rolling temperature and cooling velocity control fluctuation.
Description
Technical field
The invention belongs to metallurgical technology field, and in particular to one kind saves cold forming high intensity steel S700MC low strengths
Production method.
Background technology
Cold forming high intensity is automobile with steel S700MC and machinery industry cold forming dosage is bigger, purposes is most wide one
The trade mark, mainly for the manufacture of automobile longitudinal girder, arm etc., the processing of usual cold formability steel S700MC strips is mainly that machinery is vertical
Cut, gas flame cuttiug, welding fabrication, bending and molding etc..Cold formability steel S700MC both can be hot-rolled sheet coil dispatch from the factory or
Coiled sheet open it is flat it is crosscutting dispatch from the factory, wherein, open the flat crosscutting steel plate to dispatch from the factory and can be achieved on tempering heat treatment, and handed over condition of heat treatment
Goods.The present invention increases substantially yield strength by tempering, while tensile strength also increases, and tempering heat treatment production
Steel plate steel plate stretching performance compared with before rolled is significantly improved, low-temperature flexibility and elongation percentage increase, hardness
Reduce, steel plate residual stress substantially reduces, so as to improve the combination property of cold forming high intensity steel.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of redemption cold forming high intensity steel S700MC low strengths
Production method.Steel plate produced by the invention is significantly improved compared to steel plate stretching performance before being heat-treated, low-temperature flexibility with
Elongation percentage increases, steel plate residual stress substantially reduces, so as to improve the combination property of cold forming high strength steel.
In order to solve the above technical problems, the present invention adopts the technical scheme that：One kind saves cold forming high intensity steel
The production method of S700MC low strengths, the production method include continuous casting, heating, rolling, cool down, batch, open it is flat, tempering heat
Treatment process；The tempering heat treatment process, steel plate enter inlet temperature≤350 DEG C of heat-treatment furnace, heating-up temperature 600-
640℃。
Continuous casting working procedure of the present invention, smelting molten steel are casting continuously to form base, slab thickness 230mm.
Continuous casting working procedure of the present invention, continuous casting billet chemical composition composition and its weight/mass percentage composition are：C：0.04-0.10%,
Si≤0.10%, Mn：1.45-1.95%, P≤0.015%, S≤0.004%, Als：0.010-0.055%, Ti：0.07-0.11%,
Mo：0.14-0.20%, surplus are iron and inevitable impurity.
Heating process of the present invention, slab heating temperature are 1200-1250 DEG C, heat time 180-240min.
Rolling process of the present invention, roughing final pass rolling temperature are 1050-1080 DEG C, and rough rolling step compression ratio is
78-81%；It is 45~50mm to control workpiece thickness, and middle base inlet temperature is 950~980 DEG C；Finish rolling start rolling temperature is 940-
980 DEG C, finish rolling stage compression ratio is 70-94%；Partial, re-crystallization warm area rolls between avoiding 1006-1040 DEG C.
Refrigerating work procedure of the present invention, using laminar flow cooling technology, section cooling speed control is in 24.1-42.8 DEG C/s；
Section cooling water is controlled as：The ratio between strip upper surface laminar flow cooling water inflow and lower surface laminar flow cooling water inflow are 1.05-
1.20。
Coiling process of the present invention, coiling temperature requirement are 600-650 DEG C, but coiling temperature fluctuation is super during actual production
Go out said temperature scope, at 540-580 DEG C, cause yield strength and tensile strength to reduce, can be saved by tempering heat treatment
Such steel plate.
It is of the present invention to open flat process, opening plate 8.0~10.0mm of thickness, open thickness Reducing thickness during putting down and control in original
The 0.2~0.6% of thickness value；Concrete technology is：Coils of hot-rolled steel-uncoiler-double pinch roll -1# strips straighteners with anti-bending roll -
Trimming, scrap cutter-flying shear-belt conveyer -2# plate straightening rolls-steel plate spray printing, develop and print-steel-plate shape, surface inspection-stacking
Machine-straight sheet pile transporter -1#, 2# self-binders-handling storage.
Tempering heat treatment process of the present invention, steel plate enter inlet temperature≤350 DEG C of heat-treatment furnace, and heating-up temperature is
600-640 DEG C, the rate of heat addition≤350 DEG C/h are empty after aligning of coming out of the stove after meeting soaking time in stove 40~60min of soaking time
It is cooled to room temperature.
Mentality of designing of the present invention：
The present invention enters first with the relatively low coiled sheet of steel coil sampling inspection yield strength and tensile strength, particularly yield strength
Row is opened flat, while cuts off 3.5 meters of steel band inner ring, temper is carried out to opening plate, wherein, in rolling process, due to steel band
Length direction temperature fluctuation and the fluctuation of width cooling water etc., cause Mechanical Fluctuation, part steel band draftability occur
It can not meet standard requirement with impact property, in order to reduce loss, by steel belt decoiling, being tempered, being effectively increased
Yield strength and tensile strength, meanwhile, the elongation percentage of steel plate and low-temperature impact work also increase after tempering, and the remnants of steel plate should
Power is necessarily eliminated.
Behavior pattern before opening plate (8.0mm) tempering：Because oiler temperature control fluctuating range is larger, cause microalloy
Carbonitride can not be separated out fully, cause intensity particularly yield strength relatively low, in order to save this steel, coil of strip be opened after putting down
Carry out temper.Above-mentioned steel performance index is as follows：
Yield strength（Rel）：573~695MPa, tensile strength（Rm）：797~863MPa, elongation percentage（A）：16~21%, low temperature
（-40）Ballistic work：80~146J；
Standard（EN10149-2:2013）It is required that performance：Yield strength（Rel）：>=700MPa, tensile strength（Rm）：750~
950MPa, elongation percentage（A）：>=12%, low temperature（-40）Ballistic work：≥27J.
Cold forming high strength steel S700MC Product checking canonical references EN10149-2 of the present invention:2013.
It is using beneficial effect caused by above-mentioned technical proposal：1st, cold forming high strength steel produced by the invention
S700MC mechanical properties are uniform, change everywhere smaller on length direction, ensure that steel plate overall performance in stretching or shaping
Stability, the residual stress for reducing steel plate, solve the problems, such as that reaping hook deforms when steel plate machine cuts and gas flame cuttiug.
2nd, cold forming high strength steel S700MC produced by the invention is after tempering heat treatment, tempering steel plate upper table, following table and central part
Divide more original steel strip surface Vickers hardness averagely to reduce by 1~5HV, improve processability.3rd, cold forming produced by the invention is high
Steel plate after strength steel S700MC tempering heat treatments carries out steel plate length direction and width when machine cuts and gas flame cuttiug
Upper buckling deformation and camber shape very little.4th, the present invention solves cold forming high strength steel because of rolling temperature and chilling temperature control
System fluctuation and caused by mechanical property and impact property instability problem.
Brief description of the drawings
Fig. 1 is metallographic structure figure before the high intensity steel S700MC of embodiment 1 tempering；
Fig. 2 is metallographic structure figure after the high intensity steel S700MC of embodiment 1 tempering.
Embodiment
The present invention is further detailed explanation with specific embodiment below in conjunction with the accompanying drawings.
Embodiment 1
The present embodiment, which saves the cold forming high intensity production method of steel S700MC low strengths, includes continuous casting, heating, rolling, cold
But, batch, open flat, tempering heat treatment process, concrete technology step is as described below：
（1）Continuous casting working procedure：Smelting molten steel is casting continuously to form base, slab thickness 230mm；Continuous casting billet chemical composition forms and its quality percentage
Content is：C：0.06%, Si：0.10%, Mn：1.55%, P：0.014%, S：0.004%, Als：0.010%, Ti：0.07%, Mo：
0.16%, surplus is iron and inevitable impurity；
（2）Heating process：Slab heating temperature is 1240 DEG C, heat time 218min；
（3）Rolling process：Roughing final pass rolling temperature is 1050 DEG C, and rough rolling step compression ratio is 78%；Base is thick among control
It is 950 DEG C to spend for 45mm, middle base inlet temperature；Finish rolling start rolling temperature is 940 DEG C, and finish rolling stage compression is than 70%；
（4）Refrigerating work procedure：Using laminar flow cooling technology, section cooling speed control is in 42.1 DEG C/s；Section cooling water is distinguished
Control and be：The ratio between strip lower surface laminar flow cooling water inflow and upper surface laminar flow cooling water inflow are 1.05；
（5）Coiling process：Coiling temperature is 540 DEG C；
（6）Open flat process：Opening plate 8.0mm, open thickness Reducing thickness during putting down and control the 0.2% of original thickness value；
The present embodiment cold forming high strength steel S700MC rolled coiled sheets thickness 8mm, yield strength Rel：575MPa, tensile strength
Rm：799MPa, elongation percentage A：17%, -40 DEG C of ballistic works of low temperature：106J.
Rolled hardness：Corresponding coil of strip head, in, tail, hardness is respectively at 1/4 and at 3/4（165、168、173）、（172、
167、174）、（168、175、171）、（166、173、169）、（167、171、172）；
（7）Tempering heat treatment process：The inlet temperature that steel plate enters heat-treatment furnace is 300 DEG C, 600 DEG C of heating-up temperature, heating speed
350 DEG C/h of rate, in the min of stove soaking time 45, after meeting soaking time, room temperature is air-cooled to after aligning of coming out of the stove.
Cold forming high intensity steel S700MC coiled sheet yield strengths Rel after tempering heat treatment：755MPa, tensile strength Rm：
840MPa, elongation percentage A：17.5%, -40 DEG C of ballistic works of low temperature：129J；
Hardness after tempering heat treatment：Corresponding coil of strip head, in, tail, hardness is respectively at 1/4 and at 3/4（161、165、171）、
（170、168、169）、（167、171、170）、（162、172、167）、（165、172、165）；
Tempering steel plate upper table, following table and core are slightly decreased compared with rolled hardness Vickers hardness, averagely reduce by 2~3HV.
Tempering heat treatment production steel plate with before rolled compared with steel plate stretching performance be significantly improved, low-temperature flexibility with
Elongation percentage makes moderate progress, hardness decreases, and steel plate residual stress substantially reduces, so as to improve the comprehensive of cold forming high intensity steel
Close performance.
Metallographic structure figure is shown in Fig. 1 before the present embodiment high intensity steel S700MC tempering；Metallographic structure figure is shown in Fig. 2 after tempering.
（Metallographic structure figure is similar to Example 1 before and after embodiment 2-4 high intensity is tempered with steel S700MC, therefore omits）
Embodiment 2
The present embodiment, which saves the cold forming high intensity production method of steel S700MC low strengths, includes continuous casting, heating, rolling, cold
But, batch, open flat, tempering heat treatment process, concrete technology step is as described below：
（1）Continuous casting working procedure：Smelting molten steel is casting continuously to form base, slab thickness 230mm；Continuous casting billet chemical composition forms and its quality percentage
Content is：C：0.09%, Si：0.05%, Mn：1.65%, P：0.010%, S：0.002%, Als：0.055%, Ti：0.11%, Mo：
0.15%, surplus is iron and inevitable impurity；
（2）Heating process：Slab heating temperature is 1250 DEG C, heat time 240min；
（3）Rolling process：Roughing final pass rolling temperature is 1080 DEG C, and rough rolling step compression ratio is 81%；Base is thick among control
It is 980 DEG C to spend for 50mm, middle base inlet temperature；Finish rolling start rolling temperature is 980 DEG C, and finish rolling stage compression is than 94%；
（4）Refrigerating work procedure：Using laminar flow cooling technology, section cooling speed control is in 42.8 DEG C/s；Section cooling water is distinguished
Control and be：The ratio between strip lower surface laminar flow cooling water inflow and upper surface laminar flow cooling water inflow are 1.20；
（5）Coiling process：Coiling temperature is 560 DEG C；
（6）Open flat process：Opening plate 8.0mm, open thickness Reducing thickness during putting down and control the 0.3% of original thickness value；
The present embodiment cold forming high intensity steel S700MC rolled coiled sheets thickness 8mm, yield strength Rel：682MPa, tension are strong
Spend Rm：805MPa, elongation percentage A：21%, -40 DEG C of ballistic works of low temperature：108J.
Rolled hardness：Corresponding coil of strip head, in, tail, hardness is respectively at 1/4 and at 3/4（165、168、170）、（171、
171、173）、（168、175、171）、（166、173、169）、（167、171、172）；
（7）Tempering heat treatment process：The inlet temperature that steel plate enters heat-treatment furnace is 320 DEG C, 620 DEG C of heating-up temperature, heating speed
300 DEG C/h of rate, in stove soaking time 46min, after meeting soaking time, room temperature is air-cooled to after aligning of coming out of the stove.
Hardness after tempering heat treatment：Corresponding coil of strip head, in, tail, hardness is respectively at 1/4 and at 3/4（163、165、
171）、（170、169、171）、（165、171、169）、（165、171、166）、（165、167、169）；
Cold forming high intensity steel S700MC coiled sheet yield strengths Rel after tempering heat treatment：760MPa, tensile strength Rm：
835MPa, elongation percentage A：18.5%, -40 DEG C of ballistic works of low temperature：115J ；
Tempering steel plate upper table, following table and the more original steel strip surface Vickers hardness of core are slightly decreased, and averagely reduce by 1~3HV.
Tempering heat treatment production steel plate with before rolled compared with steel plate stretching performance be significantly improved, low-temperature flexibility with
Elongation percentage makes moderate progress, hardness decreases, and steel plate residual stress substantially reduces, so as to improve the comprehensive of cold forming high intensity steel
Close performance.
Embodiment 3
The present embodiment, which saves the cold forming high intensity production method of steel S700MC low strengths, includes continuous casting, heating, rolling, cold
But, batch, open flat, tempering heat treatment process, concrete technology step is as described below：
（1）Continuous casting working procedure：Smelting molten steel is casting continuously to form base, slab thickness 230mm；Continuous casting billet chemical composition forms and its quality percentage
Content is：C：0.04%, Si：0.03%, Mn：1.45%, P：0.015%, S：0.003%, Als：0.020%, Ti：0.09%, Mo：
0.20%, surplus is iron and inevitable impurity；
（2）Heating process：Slab heating temperature is 1200 DEG C, heat time 180min；
（3）Rolling process：Roughing final pass rolling temperature is 1060 DEG C, and rough rolling step compression ratio is 78.7%；Base among control
Thickness is 47mm, and middle base inlet temperature is 960 DEG C；Finish rolling start rolling temperature is 950 DEG C, and finish rolling stage compression is than 75%；
（4）Refrigerating work procedure：Using laminar flow cooling technology, section cooling speed control is in 24.1 DEG C/s；Section cooling water is distinguished
Control and be：The ratio between strip lower surface laminar flow cooling water inflow and upper surface laminar flow cooling water inflow are 1.10；
（5）Coiling process：Coiling temperature is 580 DEG C；
（6）Open flat process：Opening plate 10.0mm, open thickness Reducing thickness during putting down and control the 0.6% of original thickness value；
The present embodiment cold forming high intensity steel S700MC rolled coiled sheets thickness 10mm, yield strength Rel：621MPa, tension
Intensity Rm：837MPa, elongation percentage A：18%, -40 DEG C of ballistic works of low temperature：98J.
Rolled hardness：Corresponding coil of strip head, in, tail, hardness is respectively at 1/4 and at 3/4（165、167、173）、（172、
171、174）、（168、175、171）、（166、173、169）、（167、171、172）；
（7）Tempering heat treatment process：The inlet temperature that steel plate enters heat-treatment furnace is 280 DEG C, 640 DEG C of heating-up temperature, heating speed
320 DEG C/h of rate, in the min of stove soaking time 40, after meeting soaking time, room temperature is air-cooled to after aligning of coming out of the stove.
Hardness after tempering heat treatment：Corresponding coil of strip head, in, tail, hardness is respectively at 1/4 and at 3/4（162、165、
171）、（171、167、171）、（165、172、171）、（163、171、165）、（164、170、171）；
Cold forming high intensity steel S700MC coiled sheet yield strengths Rel after tempering heat treatment：748MPa, tensile strength Rm：
853MPa, elongation percentage A：17.5%, -40 DEG C of ballistic works of low temperature：154J；
Tempering steel plate upper table, following table and the more original steel strip surface Vickers hardness of core are slightly decreased, and averagely reduce by 1~3HV.
Tempering heat treatment production steel plate with before rolled compared with steel plate stretching performance be significantly improved, low-temperature flexibility with
Elongation percentage makes moderate progress, hardness decreases, and steel plate residual stress substantially reduces, so as to improve the comprehensive of cold forming high intensity steel
Close performance.
Embodiment 4
The present embodiment, which saves the cold forming high intensity production method of steel S700MC low strengths, includes continuous casting, heating, rolling, cold
But, batch, open flat, tempering heat treatment process, concrete technology step is as described below：
（1）Continuous casting working procedure：Smelting molten steel is casting continuously to form base, slab thickness 230mm；Continuous casting billet chemical composition forms and its quality percentage
Content is：C：0.10%, Si：0.07%, Mn：1.95%, P：0.09%, S：0.001%, Als：0.035%, Ti：0.08%, Mo：
0.14%, surplus is iron and inevitable impurity；
（2）Heating process：Slab heating temperature is 1235 DEG C, heat time 220min；
（3）Rolling process：Roughing final pass rolling temperature is 1070 DEG C, and rough rolling step compression ratio is 78.7%；Base among control
Thickness is 49mm, and middle base inlet temperature is 970 DEG C；Finish rolling start rolling temperature is 970 DEG C, and finish rolling stage compression is than 79.6%；
（4）Refrigerating work procedure：Using laminar flow cooling technology, section cooling speed control is in 39.8 DEG C/s；Section cooling water is distinguished
Control and be：The ratio between strip lower surface laminar flow cooling water inflow and upper surface laminar flow cooling water inflow are 1.15；
（5）Coiling process：Coiling temperature is 570 DEG C；
（6）Open flat process：Opening plate 10.0mm, open thickness Reducing thickness during putting down and control the 0.5% of original thickness value；
The present embodiment cold forming high intensity steel S700MC rolled coiled sheets thickness 10.0mm, yield strength Rel：658MPa, resist
Tensile strength Rm：814MPa, elongation percentage A：19%, -40 DEG C of ballistic works of low temperature：128J.
Rolled hardness：Corresponding coil of strip head, in, tail, hardness is respectively at 1/4 and at 3/4（165、168、173）、（172、
175、174）、（168、175、171）、（166、173、169）、（167、171、172）；
（7）The inlet temperature that steel plate enters heat-treatment furnace is 350 DEG C, 610 DEG C of heating-up temperature, 325 DEG C/h of the rate of heat addition, is protected in stove
Warm time 60min, after meeting soaking time, room temperature is air-cooled to after aligning of coming out of the stove.
Cold forming high intensity steel S700MC coiled sheet yield strengths Rel after tempering heat treatment：738MPa, tensile strength Rm：
846MPa, elongation percentage A：20.5%, -40 DEG C of ballistic works of low temperature：135J；
Hardness after tempering heat treatment：Corresponding coil of strip head, in, tail, hardness is respectively at 1/4 and at 3/4（159、163、171）、
（170、169、171）、（165、172、169）、（163、168、166）、（165、170、169）；
Tempering steel plate upper table, following table and the more original steel strip surface Vickers hardness of core are slightly decreased, and averagely reduce by 2~5HV.
Tempering heat treatment production steel plate with before rolled compared with steel plate stretching performance be significantly improved, low-temperature flexibility with
Elongation percentage makes moderate progress, hardness decreases, and steel plate residual stress substantially reduces, so as to improve the comprehensive of cold forming high intensity steel
Close performance.
Experiment proves cold forming high intensity steel S700MC tensile properties, impact property and elongation percentage ripple produced by the invention
Dynamic small, steel plate microscopic structure is uniform, improves cold forming high intensity steel S700MC intensity, processability, reduces steel plate
Residual stress, solve the problems, such as when steel plate machine cuts and gas flame cuttiug that reaping hook deforms, it is high-strength to solve cold forming
Degree steel because rolling temperature and cooling velocity control fluctuation and caused by mechanical property and impact property instability problem.
Above example is only to illustrative and not limiting technical scheme, although with reference to above-described embodiment to this hair
It is bright to be described in detail, it will be understood by those within the art that：Still the present invention can be modified or be waited
With replacing, any modification or partial replacement without departing from the spirit and scope of the present invention, it all should cover the power in the present invention
Among sharp claimed range.
Claims (9)
- A kind of 1. production method for saving cold forming high intensity steel S700MC low strengths, it is characterised in that the producer Method includes continuous casting, heating, rolling, cools down, batches, opening flat, tempering heat treatment process；The tempering heat treatment process, steel plate enter Enter inlet temperature≤350 DEG C of heat-treatment furnace, heating-up temperature is 600-640 DEG C.
- 2. a kind of production method for saving cold forming high intensity steel S700MC low strengths according to claim 1, its It is characterised by, the continuous casting working procedure, smelting molten steel is casting continuously to form base, slab thickness 230mm.
- 3. a kind of production method for saving cold forming high intensity steel S700MC low strengths according to claim 1, its It is characterised by, the continuous casting working procedure, continuous casting billet chemical composition composition and its weight/mass percentage composition are：C：0.04-0.10%, Si≤ 0.10%, Mn：1.45-1.95%, P≤0.015%, S≤0.004%, Als：0.010-0.055%, Ti：0.07-0.11%, Mo： 0.14-0.20%, surplus are iron and inevitable impurity.
- 4. a kind of production method for saving cold forming high intensity steel S700MC low strengths according to claim 1, its It is characterised by, the heating process, slab heating temperature is 1200-1250 DEG C, heat time 180-240min.
- A kind of 5. life of redemption cold forming high intensity steel S700MC low strengths according to claim 1-4 any one Production method, it is characterised in that the rolling process, roughing final pass rolling temperature are 1050-1080 DEG C, rough rolling step compression Than for 78-81%；It is 45~50mm to control workpiece thickness, and middle base inlet temperature is 950~980 DEG C；Finish rolling start rolling temperature is 940-980 DEG C, finish rolling stage compression ratio is 70-94%.
- A kind of 6. life of redemption cold forming high intensity steel S700MC low strengths according to claim 1-4 any one Production method, it is characterised in that the refrigerating work procedure, using laminar flow cooling technology, section cooling speed control is in 24.1-42.8 ℃/s；Section cooling water is controlled as：The ratio between strip lower surface laminar flow cooling water inflow and upper surface laminar flow cooling water inflow are 1.05-1.20。
- A kind of 7. life of redemption cold forming high intensity steel S700MC low strengths according to claim 1-4 any one Production method, it is characterised in that the coiling process, coiling temperature requirement is 600-650 DEG C, but coiling temperature ripple during actual production It is dynamic exceed said temperature scope, at 540-580 DEG C, yield strength and tensile strength reduction are caused, can be with by tempering heat treatment Save such steel plate.
- A kind of 8. life of redemption cold forming high intensity steel S700MC low strengths according to claim 1-4 any one Production method, it is characterised in that it is described to open flat process, 8.0~10.0mm of opening plate, open thickness Reducing thickness during putting down and control in original The 0.2~0.6% of thickness value.
- A kind of 9. life of redemption cold forming high intensity steel S700MC low strengths according to claim 1-4 any one Production method, it is characterised in that the tempering heat treatment process, steel plate enter inlet temperature≤350 DEG C of heat-treatment furnace, heating temperature Spend for 600-640 DEG C, the rate of heat addition≤350 DEG C/h, in stove 40~60min of soaking time, after meeting soaking time, aligning of coming out of the stove After be air-cooled to room temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710807367.8A CN107513662A (en) | 2017-09-08 | 2017-09-08 | Save the production method of cold forming high intensity steel S700MC low strengths |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710807367.8A CN107513662A (en) | 2017-09-08 | 2017-09-08 | Save the production method of cold forming high intensity steel S700MC low strengths |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107513662A true CN107513662A (en) | 2017-12-26 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110257612A (en) * | 2019-06-17 | 2019-09-20 | 首钢集团有限公司 | A kind of preparation method of low residual stress low alloy high strength steel plate |
| CN111748738A (en) * | 2020-06-28 | 2020-10-09 | 武汉钢铁有限公司 | High-strength thin steel plate and manufacturing method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102703824A (en) * | 2012-04-20 | 2012-10-03 | 东北大学 | Non hardened and tempered state hot-rolled steel strip with yield strength higher than 900MPa and preparation method thereof |
| CN104264052A (en) * | 2014-10-30 | 2015-01-07 | 湖南华菱涟源钢铁有限公司 | Steel plate for engineering machinery and production method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102703824A (en) * | 2012-04-20 | 2012-10-03 | 东北大学 | Non hardened and tempered state hot-rolled steel strip with yield strength higher than 900MPa and preparation method thereof |
| CN104264052A (en) * | 2014-10-30 | 2015-01-07 | 湖南华菱涟源钢铁有限公司 | Steel plate for engineering machinery and production method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110257612A (en) * | 2019-06-17 | 2019-09-20 | 首钢集团有限公司 | A kind of preparation method of low residual stress low alloy high strength steel plate |
| CN111748738A (en) * | 2020-06-28 | 2020-10-09 | 武汉钢铁有限公司 | High-strength thin steel plate and manufacturing method thereof |
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Application publication date: 20171226 |