CN107675096A - A kind of strong steel for engineering machinery plate Q800C of superelevation and its production method - Google Patents
A kind of strong steel for engineering machinery plate Q800C of superelevation and its production method Download PDFInfo
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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
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- C22C33/04—Making ferrous alloys by melting
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- 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
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- 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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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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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- 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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- 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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Abstract
The invention discloses a kind of strong steel for engineering machinery Q800C of superelevation and its production method, steel plate chemical composition composition and weight/mass percentage composition are：C：0.13~0.16%, Mn：1.40~1.50%, Nb：0.02~0.04%, V：0.09~0.11%, Ti：0.015~0.025%, Cr：0.45~0.55%, Mo：0.45~0.55%, B：0.0008~0.003%, Als >=0.03, surplus are Fe and inevitable impurity；Production method includes converter smelting, refining, continuous casting, heating, rolling, quenching+cooling, tempering heat treatment process.The present invention ensures steel cleanliness factor using LF+RH techniques, and using TMCP+DQ press quenchings+ACC coolings+temper crystal grain thinning, mechanical property of steel plate and internal soundness meet the requirements of GB/T 16,270 2009.
Description
Technical field
The invention belongs to metallurgical technology field, and in particular to a kind of strong steel for engineering machinery plate Q800C of superelevation and its production
Method.
Background technology
Q800C is the steel grade that intensity rank is higher in GB/T 16270-2009, is mainly used in excavator, crane etc.
Engineering machinery field.At present, domestic project machinery producer mainly uses the Q800C steel plates of external import, and product price is higher, and
The country possesses the producer of such production throughput, such as：Wuyang steel mill etc. mainly carries out production, process using hardening and tempering process
Cost is higher.Q800C thickness specification is defined to≤50mm by national standard GB/T 16270-2009, due to being added by domestic machinery
The limitation of work user's working ability, what existing market had the call to Q800C is the product that thickness specification is 20mm, is accounted for
More than the 50% of Q800C aggregate demands.Therefore, it is raw to develop a kind of low cost towards the Q800C products that thickness specification is 20mm
Production method, while meet mechanical property requirements of the national standard GB/T 16270-2009 for the steel grade, have for iron and steel enterprise
It is of great significance.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of strong steel for engineering machinery plate Q800C of superelevation；The present invention also carries
For a kind of strong steel for engineering machinery plate Q800C of superelevation production method.By the optimization to composition and use press quenching+tempering
Technology for Heating Processing, on the premise of the mechanical property for ensuring Q800C steel plates meets Standard, realize low cost production.
In order to solve the above technical problems, the technical solution used in the present invention is：A kind of strong steel for engineering machinery plate of superelevation
Q800C, the steel plate chemical composition composition and its weight/mass percentage composition are：C：0.13~0.16%, Mn：1.40~1.50%, Nb：
0.02~0.04%, V：0.09~0.11%, Ti：0.015~0.025%, Cr：0.45~0.55%, Mo：0.45~0.55%, B：
0.0008~0.003%, Als >=0.03, surplus are Fe and inevitable impurity.
Steel plate thickness specification of the present invention is 20mm；Yield strength 839-881MPa, tensile strength 902-978MPa, prolong
Stretch rate 15.4-18.0%, 0 DEG C of ballistic work 101-181J.
Present invention also offers a kind of strong steel for engineering machinery plate Q800C of superelevation production method, the production method bag
Include converter smelting, refining, continuous casting, heating, rolling, quenching+cooling, tempering heat treatment process；The refining procedure, using LF+
RH refinery practices；Quenching+the refrigerating work procedure, controlled and cooled down using the DQ press quenching+ACC types of cooling, cooling velocity control
In 15~22 DEG C/s, the final cooling temperature of steel plate is 400~500 DEG C.
Converter smelting process of the present invention, control tapping carbon content：C≤0.04%, using slide plate pushing off the slag, control tapping
The steel quality of the lower quantity of slag≤0.01%, it is ensured that the cleanliness factor of molten steel.
Refining procedure of the present invention, using LF+RH refinery practices；LF refining makes white slag desulfurization using lime, aluminum steel, goes out
10~15min adds ferrotianium before standing, ferro-boron carries out microalloying operation；RH refining vacuum≤100Pa, vacuum processing time >=
30min, molten steel time of repose >=10min.
Continuous casting working procedure of the present invention, whole process protection is cast during continuous casting, using two chill space electromagnetic stirrings and
Dynamic soft reduction technology, the control of molten steel overtemperature is 10~35 DEG C, and it is 0.8~0.9m/min to control whole pulling rate.
Heating process of the present invention, is heated in walking-beam furnace, and surface temperature control exists at the end of heating of plate blank
1100~1150 DEG C, heat time control is 4~5h.
Rolling process of the present invention, using controlled rolling TMCP techniques, start rolling temperature is 1080~1100 DEG C, a stage
980 DEG C of finishing temperature ＞；Two-stage start rolling temperature≤920 DEG C, the two-stage treats that temperature thickness is 3~4 times of steel plate finished product thickness,
Finishing temperature control is at 790~850 DEG C.
Quenching+refrigerating work procedure of the present invention, controlled and cooled down using the DQ press quenching+ACC types of cooling, cooling velocity control
Make in 15~22 DEG C/s, the final cooling temperature of steel plate is 400~500 DEG C.
Tempering heat treatment process of the present invention, temperature are 600~680 DEG C, and soaking time is 3.3~3.7min/
mm。
The present invention adds the microalloy element of crystal grain thinning and strong phase formation element, each element addition master into steel
To be based on following principle：
C：The element can form carbide in steel with elements such as Nb, Ti, Cr, Mo, and mainly be deposited in the form of being dissolved state
Bainite or martensite in austenite, are being formed after low-temperature transformation, is being separated out after temper in the form of carbide；This hair
Between 840~1000MPa, tissue should exist bright intensity rank in the form of the ferrite bainite and granular bainite of low-carbon；
Determined by offline numerical simulation study：When C content is 0.13~0.16%, the generation of required tissue disclosure satisfy that；When
C content is less than 0.13%, and the hardening constituent number of particles formed is inadequate, causes containing for generated ferrite bainite and martensite
Amount can not meet properties of product requirement；When C content is higher than 0.16%, then it can cause the yield strength and tensile strength mistake of steel plate
Height, so as to damage steel plate toughness；Therefore, the present invention controls C content in steel in the range of 0.13~0.16%.
Mn：The element is solution strengthening element, can stablize the yield strength and tensile strength for improving steel；By offline
Numerical simulation study shows that after Mn contents bring up to more than 1.5%, there is no bright for yield strength and tensile strength to steel
Aobvious influence, therefore, to control Q800C production cost, the present invention is by Mn contents control in steel in the range of 1.4~1.5%.
Nb：The element has extremely strong affinity in steel with nitrogen, carbon, can form stable Nb therewith（C, N）Compound,
Induce and separate out during controlled rolling, can be as the equiax crystal of phase transformation, so as to refine along austenite grain boundary Dispersed precipitate
Ferrite crystal grain；In this steel grade, Nb effect is mainly crystal grain thinning；Found in actual production, when Nb content is
When 0.02~0.04%, good crystal grain thinning can be played a part of, but when Nb contents are more than 0.04%, meeting be analysed in molten steel
Go out a large amount of thick simple substance Nb, so as to deteriorate the mechanical property of steel.Therefore, the present invention Nb contents are designed as 0.02~
0.04%。
V：The element can refine the grain structure of steel, improve the intensity of steel, can be in low temperature（Less than 700 DEG C）Separate out,
Crystal grain thinning, and precipitation abilities of the V in drawing process is stronger, and the carboritride formed can analyse in disperse in steel
Go out, crystal grain thinning is favorably improved intensity without reducing toughness plasticity；In addition, field test shows：When simultaneously V, Nb are deposited in steel
When, bainite structure is easily formed, so as to improve the intensity of steel；When V content is less than 0.09%, the V separated out carbon nitrogen
Compound is not enough to improve the mechanical property of steel；When V content is higher than 0.11%, it can be caused excessive heavy in bainite
Precipitation goes out, so as to reduce the welding performance of steel.Therefore, V content is designed as 0.09~0.11% by the present invention.
Ti：Ti addition can reduce cracks influence caused by Nb elements, and form resistant to elevated temperatures particle with C, N element and follow closely
Prick in original austenite crystal boundary, prevent growing up for original grain, and improve the welding performance of steel plate；But result of the test shows：
The TiN that enough volume fractions can not be obtained effectively to prevent the roughening of crystal grain in steel by too low Ti contents；Too high Ti contents
Thick TiN will be caused to separate out, so as to which the roughening of crystal grain in steel can not be prevented；Experiment shows：When Ti contents 0.015~
When 0.025%, tiny, sufficient TiN can be separated out in steel, so as to effectively prevent steel in crystal grain it is thick, lift the power of steel
Learn performance.Therefore, Ti contents are designed as 0.015~0.025% by the present invention.
Cr、Mo：This Was Used can significantly improve steel plate quenching degree, be advantageous to form stable bayesian in quenching process
Body or martensite；And Cr can form stable and high hardness carbide, Mo can prevent temper brittleness and with secondary hard
Change acts on；Field test shows：When Cr, Mo content are less than 0.45%, the through hardening performance impact for Q800C steel is limited, steel
Material strength enhancing DeGrain；But after Cr content brings up to 0.55%, can the larger plasticity and toughness for reducing steel；And Mo
Content bring up to after 0.55%, its influence to steel strength also tend to stabilization, the market price of Mo alloys is higher in addition,
The production cost of Q800C products can also be lifted by being excessively used.Therefore, Cr, Mo content are designed as 0.45~0.55% by the present invention.
B：The element can significantly improve the through hardening performance of steel, and it hinders ferritic forming core in the segregation of austenite grain boundary
And be advantageous to the formation of bainite, and then improve the mechanical strength of steel；Field test shows：When B content is less than 0.0008%
When, the effect to raising Q800C through hardening performances is very small；But when B content is higher than 0.003%, caused boron phase in steel can be made（Fe3
(CB)、Fe3(BC)6、Fe2B）Separated out along austenite grain boundary, so as to produce hot-short phenomenon, influence follow-up Q800C steel product qualities.
Therefore, B content is designed as 0.0008~0.003% by the present invention.
The present invention is ensures the requirement that mechanical property of steel plate meets GB/T 16270-2009, using controlled rolling TMCP+DQ
The technological process of press quenching+ACC coolings+tempering, the parameter setting of each technological process are based primarily upon following principle：
A, in order to ensure the surface quality of steel plate, found in the production process of reality, rely on existing furnace apparatus, selected
1100~1150 DEG C of heating-up temperature can reduce the generation of iron scale in heating process as far as possible, be easy to De-scaling box to remove
Squama；And in this temperature range, original austenite grains size will not drastically grow up, and be easy to crystal grain thinning；Due to Cr in steel,
The content of the elements such as Mo is high, and diffusion is not easy to be evenly distributed, it is necessary to extend heat time to 4~5h, guarantee Ovshinsky in-vivo element.
B, first stage rolling temperature is controlled at 980 DEG C above is the deformation in order to ensure the steel plate first stage is in Ovshinsky
Body recrystallization warm area is carried out, and passes through recrystallization softening crystal grain repeatedly；By the start rolling temperature of two-stage be scheduled on less than 920 DEG C be for
Ensure that its deformation is carried out in non-recrystallization warm area, avoid partial, re-crystallization warm area, reduction mixed crystal phenomenon；Steel plate treats temperature
Thickness is 3~4 times of finished product thickness, is the accumulative deflection in order to improve steel plate as far as possible in non-recrystallization temperature, is
Phase transformation provides enough forming core points（Dislocation）And driving force（Deformation energy）；Finishing temperature control is to reduce at 790~850 DEG C
Finishing temperature is to the temperature difference between transformation temperature, because reply phenomenon can occur for tissue in the process, reduces dislocation density and change
Shape energy, is unfavorable for crystal grain thinning.
C, the Gleeble thermal simulation results of this steel grade are shown, in order to obtain the strong phase of martensite, process of the steel plate in cooling
In, its cooling rate is necessary >=8 DEG C/s, and as cooling rate increases to 40 DEG C/s, significant change will not mutually occur for tissue, but martensite
Lath spacing can taper into.And bainitic transformation start temperature is about 500 DEG C, finishing temperature is about 380 DEG C.With reference to life
Production is actual, between this steel plate quenching temperature is set as into 400~500 DEG C, had both met phase transformation requirement, and had also met production line
Practical operation demand.
D, because the alloying element contents such as Cr, Mo, V of steel plate are high, cause its temper resistance very high；And steel plate system
Row tempering test result indicates that；For the temperature of steel plate when between 600~680 DEG C, the tissue of steel plate is based on bainite, base
The carbide of disperse is dispersed with body, the intensity and elongation percentage of steel plate also all meet the requirements；When temperature is more than 680 DEG C,
The pattern of tissue breakdown is obvious, and corresponding intensity index does not meet Standard then.
High-strength engineering machines of the present invention refer to GB/T 16270-2009 with steel plate Q800C mechanical property test methods.
It is using beneficial effect caused by above-mentioned technical proposal：1st, the present invention is using Cr, Mo, Nb, V, Ti, B component
System, toughness is not reduced on the premise of proof strength, formed by the microalloy element Nb and strong phase that add crystal grain thinning
Elements Mo, Cr, V, B, it is ensured that mechanical property of steel plate.2nd, the present invention ensures the cleanliness factor of steel by LF+RH techniques, it is ensured that steel
Intralamellar part quality meets flaw detection and required.3rd, the technique that the present invention uses controlled rolling TMCP+DQ press quenchings+ACC coolings+tempering
Process refinement crystal grain.4th, the strong steel for engineering machinery plate mechanical property of Q800C superelevation produced by the invention and internal soundness meet GB/
T 16270-2009 requirements, microstructure is low-carbon bainite+ferritic structure.
Brief description of the drawings
Fig. 1 is the Q800C steel plates micro-organization chart that embodiment 1 produces；
Fig. 2 is the Q800C steel plates micro-organization chart that embodiment 2 produces；
Fig. 3 is the Q800C steel plates micro-organization chart that embodiment 3 produces；
Fig. 4 is the Q800C steel plates micro-organization chart that embodiment 4 produces；
Fig. 5 is the Q800C steel plates micro-organization chart that embodiment 5 produces.
Embodiment
With reference to specific embodiments and the drawings, the present invention is further detailed explanation.
Embodiment 1
The present embodiment high-strength engineering machines are 20mm with steel plate Q800C thickness, and its chemical composition composition and weight/mass percentage composition are shown in
Table 1.
The present embodiment high-strength engineering machines steel plate Q800C production methods include converter smelting, refining, continuous casting, heat, roll
System, quenching+cooling, tempering heat treatment process, concrete technology step are as described below：
（1）Converter smelting process：It is 0.04% to control tapping carbon content, and using slide plate pushing off the slag, the lower quantity of slag of tapping is steel quality
0.01%；
（2）Refining procedure：Using LF+RH refinery practices；LF refining makes white slag desulfurization using lime, aluminum steel, and outbound preceding 11min adds
Enter ferrotianium, ferro-boron carries out microalloying operation；RH refines vacuum 95Pa, vacuum processing time 32min, molten steel time of repose
For 12min；
（3）Continuous casting working procedure：Whole process protection is cast during continuous casting, uses two chill space electromagnetic stirrings and dynamic soft-reduction skill
Art, molten steel overtemperature are 15 DEG C, and whole pulling rate is 0.85m/min；
（4）Heating process：Heated in walking-beam furnace, surface temperature is 1132 DEG C at the end of heating of plate blank, and the heat time is
4.2h；
（5）Rolling process：Using controlled rolling TMCP techniques, start rolling temperature is 1085 DEG C, 985 DEG C of a stage finishing temperature；Two
915 DEG C of stage start rolling temperature, the temperature thickness for the treatment of of two-stage is 72mm, 822 DEG C of finishing temperature；
（6）Quenching+refrigerating work procedure：Controlled and cooled down using the DQ press quenching+ACC types of cooling, cooling velocity is 18.9 DEG C/s, steel
The final cooling temperature of plate is 434 DEG C；
（7）Tempering heat treatment process：Temperature is 600 DEG C, soaking time 3.5min/mm.
The present embodiment high-strength engineering machines steel plate Q800 microstructures are shown in Fig. 1, and microstructure is low-carbon bainite+iron element
Body tissue；Mechanical property is shown in Table 2, and mechanical property of steel plate and internal soundness meet GB/T 16270-2009 requirements.
Embodiment 2
The present embodiment high-strength engineering machines are 20mm with steel plate Q800C thickness, and its chemical composition composition and weight/mass percentage composition are shown in
Table 1.
The present embodiment high-strength engineering machines steel plate Q800C production methods include converter smelting, refining, continuous casting, heat, roll
System, quenching+cooling, tempering heat treatment process, concrete technology step are as described below：
（1）Converter smelting process：It is 0.02% to control tapping carbon content, and using slide plate pushing off the slag, the lower quantity of slag of tapping is steel quality
0.005%；
（2）Refining procedure：Using LF+RH refinery practices；LF refining makes white slag desulfurization using lime, aluminum steel, and outbound preceding 13min adds
Enter ferrotianium, ferro-boron carries out microalloying operation；RH refines vacuum 90Pa, vacuum processing time 35min, molten steel time of repose
For 13min；
（3）Continuous casting working procedure：Whole process protection is cast during continuous casting, uses two chill space electromagnetic stirrings and dynamic soft-reduction skill
Art, molten steel overtemperature are 20 DEG C, and whole pulling rate is 0.8m/min；
（4）Heating process：Heated in walking-beam furnace, surface temperature is 1150 DEG C at the end of heating of plate blank, and the heat time is
4.5h；
（5）Rolling process：Using controlled rolling TMCP techniques, start rolling temperature is 1090 DEG C, 990 DEG C of a stage finishing temperature；Two
910 DEG C of stage start rolling temperature, two-stage treat that temperature thickness is 70mm, and finishing temperature is 826 DEG C；
（6）Quenching+refrigerating work procedure：Controlled and cooled down using the DQ press quenching+ACC types of cooling, cooling velocity is 19.4 DEG C/s, steel
The final cooling temperature of plate is 438 DEG C；
（7）Tempering heat treatment process：Temperature is 640 DEG C, soaking time 3.3min/mm.
The present embodiment high-strength engineering machines steel plate Q800 microstructures are shown in Fig. 2, and microstructure is low-carbon bainite+iron element
Body tissue；Mechanical property is shown in Table 2, and mechanical property of steel plate and internal soundness meet GB/T 16270-2009 requirements.
Embodiment 3
The present embodiment high-strength engineering machines are 20mm with steel plate Q800C thickness, and its chemical composition composition and weight/mass percentage composition are shown in
Table 1.
The present embodiment high-strength engineering machines steel plate Q800C production methods include converter smelting, refining, continuous casting, heat, roll
System, quenching+cooling, tempering heat treatment process, concrete technology step are as described below：
（1）Converter smelting process：It is 0.02% to control tapping carbon content, and using slide plate pushing off the slag, the lower quantity of slag of tapping is steel quality
0.008%；
（2）Refining procedure：Using LF+RH refinery practices；LF refining makes white slag desulfurization using lime, aluminum steel, and outbound preceding 14min adds
Enter ferrotianium, ferro-boron carries out microalloying operation；RH refines vacuum 85Pa, vacuum processing time 37min, molten steel time of repose
For 15min；
（3）Continuous casting working procedure：Whole process protection is cast during continuous casting, uses two chill space electromagnetic stirrings and dynamic soft-reduction skill
Art, molten steel overtemperature are 25 DEG C, and whole pulling rate is 0.9m/min；
（4）Heating process：Heated in walking-beam furnace, surface temperature is 1126 DEG C at the end of heating of plate blank, and the heat time is
4.7h；
（5）Rolling process：Using controlled rolling TMCP techniques, start rolling temperature is 1095 DEG C, 987 DEG C of a stage finishing temperature；Two
917 DEG C of stage start rolling temperature, two-stage treat that temperature thickness is 73mm, and finishing temperature is 828 DEG C；
（6）Quenching+refrigerating work procedure：Controlled and cooled down using the DQ press quenching+ACC types of cooling, cooling velocity is 20.6 DEG C/s, steel
The final cooling temperature of plate is 444 DEG C；
（7）Tempering heat treatment process：Temperature is 680 DEG C, soaking time 3.7min/mm.
The present embodiment high-strength engineering machines steel plate Q800 microstructures are shown in Fig. 3, and microstructure is low-carbon bainite+iron element
Body tissue；Mechanical property is shown in Table 2, and mechanical property of steel plate and internal soundness meet GB/T 16270-2009 requirements.
Embodiment 4
The present embodiment high-strength engineering machines are 20mm with steel plate Q800C thickness, and its chemical composition composition and weight/mass percentage composition are shown in
Table 1.
The present embodiment high-strength engineering machines steel plate Q800C production methods include converter smelting, refining, continuous casting, heat, roll
System, quenching+cooling, tempering heat treatment process, concrete technology step are as described below：
（1）Converter smelting process：It is 0.04% to control tapping carbon content, and using slide plate pushing off the slag, the lower quantity of slag of tapping is steel quality
0.007%；
（2）Refining procedure：Using LF+RH refinery practices；LF refining makes white slag desulfurization using lime, aluminum steel, and outbound preceding 10min adds
Enter ferrotianium, ferro-boron carries out microalloying operation；RH refines vacuum 100Pa, vacuum processing time 30min, when molten steel is stood
Between be 10min；
（3）Continuous casting working procedure：Whole process protection is cast during continuous casting, uses two chill space electromagnetic stirrings and dynamic soft-reduction skill
Art, molten steel overtemperature are 10 DEG C, and whole pulling rate is 0.8m/min；
（4）Heating process：Heated in walking-beam furnace, surface temperature is 1100 DEG C at the end of heating of plate blank, and the heat time is
4h；
（5）Rolling process：Using controlled rolling TMCP techniques, start rolling temperature is 1080 DEG C, 983 DEG C of a stage finishing temperature；Two
905 DEG C of stage start rolling temperature, two-stage treat that temperature thickness is 80mm, and finishing temperature is 790 DEG C；
（6）Quenching+refrigerating work procedure：Controlled and cooled down using the DQ press quenching+ACC types of cooling, cooling velocity is 15 DEG C/s, steel plate
Final cooling temperature be 500 DEG C；
（7）Tempering heat treatment process：Temperature is 630 DEG C, soaking time 3.6min/mm.
The present embodiment high-strength engineering machines steel plate Q800 microstructures are shown in Fig. 4, and microstructure is low-carbon bainite+iron element
Body tissue；Mechanical property is shown in Table 2, and mechanical property of steel plate and internal soundness meet GB/T 16270-2009 requirements.
Embodiment 5
The present embodiment high-strength engineering machines are 20mm with steel plate Q800C thickness, and its chemical composition composition and weight/mass percentage composition are shown in
Table 1.
The present embodiment high-strength engineering machines steel plate Q800C production methods include converter smelting, refining, continuous casting, heat, roll
System, quenching+cooling, tempering heat treatment process, concrete technology step are as described below：
（1）Converter smelting process：It is 0.03% to control tapping carbon content, and using slide plate pushing off the slag, the lower quantity of slag of tapping is steel quality
0.006%；
（2）Refining procedure：Using LF+RH refinery practices；LF refining makes white slag desulfurization using lime, aluminum steel, and outbound preceding 15min adds
Enter ferrotianium, ferro-boron carries out microalloying operation；RH refines vacuum 80Pa, vacuum processing time 40min, molten steel time of repose
For 20min；
（3）Continuous casting working procedure：Whole process protection is cast during continuous casting, uses two chill space electromagnetic stirrings and dynamic soft-reduction skill
Art, molten steel overtemperature are 35 DEG C, and whole pulling rate is 0.9m/min；
（4）Heating process：Heated in walking-beam furnace, surface temperature is 1142 DEG C at the end of heating of plate blank, and the heat time is
5h；
（5）Rolling process：Using controlled rolling TMCP techniques, start rolling temperature is 1100 DEG C, 995 DEG C of a stage finishing temperature；Two
920 DEG C of stage start rolling temperature, two-stage treat that temperature thickness is 60mm, and finishing temperature is 850 DEG C；
（6）Quenching+refrigerating work procedure：Controlled and cooled down using the DQ press quenching+ACC types of cooling, 22 DEG C/s of cooling velocity, steel plate
Final cooling temperature is 400 DEG C；
（7）Tempering heat treatment process：Temperature is 650 DEG C, soaking time 3.4min/mm.
The present embodiment high-strength engineering machines steel plate Q800C microstructures are shown in Fig. 5, and microstructure is low-carbon bainite+iron
Ferritic tissue；Mechanical property is shown in Table 2, and mechanical property of steel plate and internal soundness meet GB/T 16270-2009 requirements.
The Q800C steel plates chemical composition of 1 embodiment of table 1~5 forms and weight/mass percentage composition（%）
The chemical composition surplus of embodiment 1~5 is Fe and inevitable impurity.
The mechanical property of the Q800C steel plates of 2 embodiment of table 1~5
Above example is only to illustrative and not limiting technical scheme, although entering with reference to above-described embodiment to the present invention
Go detailed description, it will be understood by those within the art that：Still the present invention can be modified or equally replaced
Change, any modification or partial replacement without departing from the spirit and scope of the present invention, it all should cover will in right of the invention
Ask among scope.
Claims (10)
1. a kind of strong steel for engineering machinery plate Q800C of superelevation, it is characterised in that the steel plate chemical composition composition and its quality hundred
Point content is：C：0.13~0.16%, Mn：1.40~1.50%, Nb：0.02~0.04%, V：0.09~0.11%, Ti：0.015~
0.025%, Cr：0.45~0.55%, Mo：0.45~0.55%, B：0.0008~0.003%, Als >=0.03, surplus is for Fe and not
Evitable impurity.
2. the strong steel for engineering machinery plate Q800C of a kind of superelevation according to claim 1, it is characterised in that the steel plate is thick
Metric lattice are 20mm；Yield strength 839-881MPa, tensile strength 902-978MPa, elongation percentage 15.4-18.0%, 0 DEG C of ballistic work
101-181J。
3. based on the production method of the strong steel for engineering machinery plate Q800C of superelevation described in claim 1 or 2 a kind of, its feature exists
In the production method includes converter smelting, refining, continuous casting, heating, rolling, quenching+cooling, tempering heat treatment process；It is described
Refining procedure, using LF+RH refinery practices；Quenching+the refrigerating work procedure, controlled using the DQ press quenching+ACC types of cooling cold
But, cooling velocity is controlled in 15~22 DEG C/s, and the final cooling temperature of steel plate is 400~500 DEG C.
A kind of 4. strong steel for engineering machinery plate Q800C of superelevation according to claim 3 production method, it is characterised in that
The converter smelting process, control tapping carbon content：C≤0.04%, using slide plate pushing off the slag, the steel of the lower quantity of slag of control tapping≤0.01%
Water quality.
A kind of 5. strong steel for engineering machinery plate Q800C of superelevation according to claim 3 production method, it is characterised in that
The refining procedure, using LF+RH refinery practices；LF refining makes white slag desulfurization, outbound preceding 10~15min using lime, aluminum steel
Add ferrotianium, ferro-boron carries out microalloying operation；RH refines vacuum≤100Pa, RH processing times >=30min, and molten steel is stood
Time >=5min.
6. the production method of the strong steel for engineering machinery plate Q800C of superelevation according to claim 3-5 any one a kind of, its
It is characterised by, the continuous casting working procedure, whole process protection is cast during continuous casting, uses two chill space electromagnetic stirrings and Dynamic Light
Reduction Technology, the control of molten steel overtemperature is 10~35 DEG C, and it is 0.8~0.9m/min to control whole pulling rate.
7. the production method of the strong steel for engineering machinery plate Q800C of superelevation according to claim 3-5 any one a kind of, its
Be characterised by, the heating process, heated in walking-beam furnace, at the end of heating of plate blank surface temperature control 1100~
1150 DEG C, heat time control is 4~5h.
8. the production method of the strong steel for engineering machinery plate Q800C of superelevation according to claim 3-5 any one a kind of, its
It is characterised by, the rolling process, using controlled rolling TMCP techniques, start rolling temperature is 1080~1100 DEG C, stage finish to gauge
980 DEG C of temperature ＞；Two-stage start rolling temperature≤920 DEG C, the two-stage treats that temperature thickness is 3~4 times of steel plate finished product thickness, finish to gauge
Temperature control is at 790~850 DEG C.
9. the production method of the strong steel for engineering machinery plate Q800C of superelevation according to claim 3-5 any one a kind of, its
It is characterised by, the quenching+refrigerating work procedure, being controlled and being cooled down using the DQ press quenching+ACC types of cooling, cooling velocity control exists
15~22 DEG C/s, the final cooling temperature of steel plate is 400~500 DEG C.
10. the production method of the strong steel for engineering machinery plate Q800C of superelevation according to claim 3-5 any one a kind of,
Characterized in that, the tempering heat treatment process, temperature is 600~680 DEG C, and soaking time is 3.3~3.7min/mm.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109055868A (en) * | 2018-10-10 | 2018-12-21 | 鞍钢股份有限公司 | A kind of production method of X80 think gauge ultra-wide straight-line joint submerged arc welding tube line steel |
| CN109295392A (en) * | 2018-11-30 | 2019-02-01 | 湖南华菱湘潭钢铁有限公司 | A kind of production method of great surface quality super-high strength steel |
| CN110952020A (en) * | 2019-10-16 | 2020-04-03 | 邯郸钢铁集团有限责任公司 | Economical 900 MPa-grade ultrahigh-strength quenched and tempered steel plate and production method thereof |
| CN113355600A (en) * | 2021-05-30 | 2021-09-07 | 五矿营口中板有限责任公司 | Super-thick steel plate for online quenching 800 MPa-grade engineering machinery and manufacturing method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106086639A (en) * | 2016-06-20 | 2016-11-09 | 河北钢铁股份有限公司邯郸分公司 | A kind of superelevation strong steel for engineering machinery Q960D and production method thereof |
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- 2017-08-15 CN CN201710697058.XA patent/CN107675096A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106086639A (en) * | 2016-06-20 | 2016-11-09 | 河北钢铁股份有限公司邯郸分公司 | A kind of superelevation strong steel for engineering machinery Q960D and production method thereof |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109055868A (en) * | 2018-10-10 | 2018-12-21 | 鞍钢股份有限公司 | A kind of production method of X80 think gauge ultra-wide straight-line joint submerged arc welding tube line steel |
| CN109055868B (en) * | 2018-10-10 | 2020-02-18 | 鞍钢股份有限公司 | Production method of X80 thick ultra-wide longitudinal submerged arc welding pipeline steel |
| CN109295392A (en) * | 2018-11-30 | 2019-02-01 | 湖南华菱湘潭钢铁有限公司 | A kind of production method of great surface quality super-high strength steel |
| CN110952020A (en) * | 2019-10-16 | 2020-04-03 | 邯郸钢铁集团有限责任公司 | Economical 900 MPa-grade ultrahigh-strength quenched and tempered steel plate and production method thereof |
| CN113355600A (en) * | 2021-05-30 | 2021-09-07 | 五矿营口中板有限责任公司 | Super-thick steel plate for online quenching 800 MPa-grade engineering machinery and manufacturing method thereof |
| CN113355600B (en) * | 2021-05-30 | 2022-10-25 | 日钢营口中板有限公司 | Super-thick steel plate for online quenching 800 MPa-grade engineering machinery and manufacturing method thereof |
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