CN104694837A - High-strength steel structural component used for building curtain wall engineering and heating processing technology thereof - Google Patents
High-strength steel structural component used for building curtain wall engineering and heating processing technology thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 123
- 239000010959 steel Substances 0.000 title claims abstract description 123
- 238000005516 engineering process Methods 0.000 title abstract description 7
- 238000010438 heat treatment Methods 0.000 title abstract description 6
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 44
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 38
- 238000005496 tempering Methods 0.000 claims abstract description 20
- 238000010791 quenching Methods 0.000 claims abstract description 18
- 230000000171 quenching effect Effects 0.000 claims abstract description 18
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 claims abstract description 17
- 238000001556 precipitation Methods 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 claims description 80
- 238000000034 method Methods 0.000 claims description 51
- 238000007669 thermal treatment Methods 0.000 claims description 17
- 239000012535 impurity Substances 0.000 claims description 16
- 239000007788 liquid Substances 0.000 claims description 16
- 239000000203 mixture Substances 0.000 claims description 9
- 229910052759 nickel Inorganic materials 0.000 claims description 9
- 229910000859 α-Fe Inorganic materials 0.000 claims description 9
- 229910052804 chromium Inorganic materials 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 229910052739 hydrogen Inorganic materials 0.000 claims description 8
- 229910052748 manganese Inorganic materials 0.000 claims description 8
- 229910052750 molybdenum Inorganic materials 0.000 claims description 8
- 229910052758 niobium Inorganic materials 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 8
- 229910052698 phosphorus Inorganic materials 0.000 claims description 8
- 229910052717 sulfur Inorganic materials 0.000 claims description 8
- 229910052720 vanadium Inorganic materials 0.000 claims description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 5
- 239000013078 crystal Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000005275 alloying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
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Abstract
The invention discloses a high-strength steel structural component used for building curtain wall engineering and a heating processing technology thereof. The heating processing technology of quenching-secondary quenching-tempering is adopted. The temperature of the quenching ranges from 960 DEG C to 980 DEG C, the temperature of the secondary quenching ranges from 770 DEG C to 790 DEG C, the temperature of the tempering ranges from 650 DEG C to 670 DEG C, a structure which takes the tempered sorbite as the principle thing is obtained, the quantity of the induced austenite inside the steel is increased through the reverse change of the martensite, the induced austenite is mainly distributed on the boundary of the lath martensite, and the distribution of the structure is more dispersed and evener. Meanwhile, the precipitation amount of the carbide is bigger, smaller and more dispersed. The low temperature impact toughness of the high-strength steel structural component used for the building curtain wall engineering can be greatly improved.
Description
Technical field
The present invention relates to a kind of construction steel structure and heat treatment technics thereof, specifically a kind of high-strength steel structural part for building curtain wall engineering and thermal treatment process thereof.
Background technology
9Ni steel is first by the product research laboratory development success of International nickel Co. Ltd. Inco. Ltd. of the U.S., and alloying element Ni content, between 8.50-10.00wt%, is a kind of low-carbon (LC) quenched and tempered steel.9Ni steel, as the ferrite type steel uniquely can be on active service under-196 DEG C of cold condition, has higher yield strength and tensile strength, excellent low-temperature flexibility, good weldability.
9Ni steel must adopt suitable thermal treatment process, just can improve its low-temperature flexibility at-196 DEG C largely.Further investigation 9Ni Heat Treatment Of Steel technique, by Optimizing Process Parameters, finds out the relation of heat treatment process parameter and 9Ni steel low-temperature flexibility, has great significance to the application of 9Ni steel and development thereof.
For the high-strength steel structural part of building curtain wall engineering, some key position needs to use 9Ni steel, thus 9Ni steel rate of utilization is increased significantly, by existing thermal treatment process, service requirements can be reached, but the mechanical property requirements of 9Ni steel, especially low-temperature impact toughness surplus capacity are little, the security that extreme influence 9Ni steel uses at low temperature.
Summary of the invention
Technical problem to be solved by this invention is: for not enough for the low-temperature impact toughness of the high-strength steel structural part of building curtain wall engineering in prior art, propose a kind of high-strength steel structural part for building curtain wall engineering and thermal treatment process thereof, significantly improve the high-strength steel structural part low-temperature impact toughness for building curtain wall engineering.
The technical scheme that the present invention solves above technical problem is:
A kind of high-strength steel structural part for building curtain wall engineering, its composition and mass percent are: C:0.51-0.53%, Ni:8.50-8.70%, Mn:0.65-0.67%, Si:0.03-0.05%, P:0.005-0.007%, S:0.002-0.004%, Nb:0.09-0.11%, V:0.04-0.06%, Ti:0.11-0.13%, Al:0.07-0.09%, N≤0.006%, H≤0.00020%, Cu:0.032-0.035%, Cr:0.1-0.3%, Mo:0.33-0.35%, surplus is Fe and inevitable impurity;
In this steel, first-phase is tempered sorbite, second-phase is reversed austenite, third phase is lath martensite, converes instruction is mainly distributed in lath martensite border, at thickness place, surface to 1/4, second-phase percent by volume is 9.5-9.7%, third phase percent by volume is 5.5-5.7%, and 1/4 thickness is 8.0-8.3% to center second-phase percent by volume, and third phase percent by volume is 7.5-7.8%.
For the thermal treatment process of the high-strength steel structural part of building curtain wall engineering, adopt the thermal treatment process of quenching-secondary quenching-tempering; Quenching temperature is 960-980 DEG C, carries out in normalizing furnace, adopts the first refrigerating work procedure to be chilled to room temperature, makes to organize complete austenitizing, impurity and second phase particles back dissolving, fining austenite grains; Secondary quenching temperature is 770-790 DEG C, carries out in normalizing furnace, adopts the second refrigerating work procedure to be chilled to room temperature, obtains tiny ferrite and martensitic stucture; Tempering temperature is 650-670 DEG C, carry out in tempering stove, the 3rd refrigerating work procedure is adopted to be chilled to room temperature, obtain the tissue based on tempered sorbite, and the increasing number of reversed austenite in steel is made by martensitic reverted austenite, and converes instruction is mainly distributed in lath martensite border, makes to organize disperse more, be uniformly distributed; Meanwhile, make Carbide Precipitation amount comparatively large, and small and dispersed;
First refrigerating work procedure: first adopt the air-cooled rate of cooling with 5-7 DEG C/s that steel is chilled to 610-630 DEG C, adopt water-cooled, with the rate of cooling of 9-11 DEG C/s, molten steel is chilled to 470-490 DEG C again, finally adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 7-9 DEG C/s, steel is chilled to room temperature;
Second refrigerating work procedure: first adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 11-13 DEG C/s, steel is chilled to 620-650 DEG C, adopt water-cooled, with the rate of cooling of 13-15 DEG C/s, molten steel is chilled to 460-480 DEG C again, then air cooling is to 350-370 DEG C, finally adopts water-cooled, with the rate of cooling of 7-9 DEG C/s, molten steel is chilled to room temperature;
3rd refrigerating work procedure: first adopt water-cooled, with the rate of cooling of 11-13 DEG C/s, molten steel is chilled to 420-450 DEG C, then air cooling is to 350-370 DEG C, then adopts water-cooled, with the rate of cooling of 4-6 DEG C/s, molten steel is chilled to room temperature.
The invention has the beneficial effects as follows: the present invention is limited and thermal treatment process by composition, on the one hand, reversed austenite is separated out in flake at martensite lath intergranular, is evenly distributed; On the other hand, improve the thermostability of reversed austenite, thus make crystal boundary and matrix malleableize, the low-temperature impact toughness of the high-strength steel structural part for building curtain wall engineering can be significantly improved, do not reduce or reduce intensity a little simultaneously.In a word, the present invention changes tissue morphology by thermal treatment process, reversed austenite is separated out in flake at martensite lath intergranular, and is evenly distributed, and then improve the thermostability of reversed austenite, thus make crystal boundary and matrix malleableize.
Embodiment
embodiment 1
The present embodiment is a kind of high-strength steel structural part for building curtain wall engineering, its composition and mass percent are: C:0.51%, Ni:8.50%, Mn:0.65%, Si:0.03%, P:0.005%, S:0.002%, Nb:0.09%, V:0.04%, Ti:0.11%, Al:0.07%, N:0.006%, H:0.00020%, Cu:0.032%, Cr:0.1%, Mo:0.33%, surplus is Fe and inevitable impurity; In this steel, first-phase is tempered sorbite, second-phase is reversed austenite, third phase is lath martensite, converes instruction is mainly distributed in lath martensite border, at thickness place, surface to 1/4, second-phase percent by volume is 9.5%, third phase percent by volume is 5.5%, 1/4 thickness is 8.0% to center second-phase percent by volume, and third phase percent by volume is 7.5%.
The thermal treatment process of the high-strength steel structural part for building curtain wall engineering of the present embodiment, quenching temperature is 960 DEG C, carries out in normalizing furnace, the first refrigerating work procedure is adopted to be chilled to room temperature, make to organize complete austenitizing, impurity and second phase particles back dissolving, fining austenite grains; Secondary quenching temperature is 770 DEG C, carries out in normalizing furnace, adopts the second refrigerating work procedure to be chilled to room temperature, obtains tiny ferrite and martensitic stucture; Tempering temperature is 650 DEG C, carry out in tempering stove, the 3rd refrigerating work procedure is adopted to be chilled to room temperature, obtain the tissue based on tempered sorbite, and the increasing number of reversed austenite in steel is made by martensitic reverted austenite, and converes instruction is mainly distributed in lath martensite border, makes to organize disperse more, be uniformly distributed; Meanwhile, make Carbide Precipitation amount comparatively large, and small and dispersed; Wherein: the first refrigerating work procedure: first adopt and air-cooledly with the rate of cooling of 5 DEG C/s, steel is chilled to 610 DEG C, adopt water-cooled, with the rate of cooling of 9 DEG C/s, molten steel is chilled to 470 DEG C again, finally adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 7 DEG C/s, steel is chilled to room temperature; Second refrigerating work procedure: first adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 11 DEG C/s, steel is chilled to 620 DEG C, adopt water-cooled, with the rate of cooling of 13 DEG C/s, molten steel is chilled to 460 DEG C again, then air cooling to 350 DEG C, finally adopts water-cooled, with the rate of cooling of 7 DEG C/s, molten steel is chilled to room temperature; 3rd refrigerating work procedure: first adopt water-cooled with the rate of cooling of 11 DEG C/s, molten steel to be chilled to 420 DEG C, then air cooling to 350 DEG C, then adopt water-cooled, with the rate of cooling of 4 DEG C/s, molten steel is chilled to room temperature.
The yield strength of high-strength steel structural part that the present embodiment is used for building curtain wall engineering is 590-630MPa, tensile strength is 680-720MPa, unit elongation is 26.0-30.0%, ballistic work is 200-230J.
embodiment 2
The present embodiment is a kind of high-strength steel structural part for building curtain wall engineering, its composition and mass percent are: C:0.52%, Ni:8.60%, Mn:0.66%, Si:0.04%, P:0.006%, S:0.003%, Nb:0.10%, V:0.05%, Ti:0.12%, Al:0.08%, N:0.003%, H:0.0001%, Cu:0.033%, Cr:0.2%, Mo:0.34%, surplus is Fe and inevitable impurity; In this steel, first-phase is tempered sorbite, second-phase is reversed austenite, third phase is lath martensite, converes instruction is mainly distributed in lath martensite border, at thickness place, surface to 1/4, second-phase percent by volume is 9.6%, third phase percent by volume is 5.6%, 1/4 thickness is 8.2% to center second-phase percent by volume, and third phase percent by volume is 7.6%.
The thermal treatment process of the high-strength steel structural part for building curtain wall engineering of the present embodiment, quenching temperature is 970 DEG C, carries out in normalizing furnace, the first refrigerating work procedure is adopted to be chilled to room temperature, make to organize complete austenitizing, impurity and second phase particles back dissolving, fining austenite grains; Secondary quenching temperature is 780 DEG C, carries out in normalizing furnace, adopts the second refrigerating work procedure to be chilled to room temperature, obtains tiny ferrite and martensitic stucture; Tempering temperature is 660 DEG C, carry out in tempering stove, the 3rd refrigerating work procedure is adopted to be chilled to room temperature, obtain the tissue based on tempered sorbite, and the increasing number of reversed austenite in steel is made by martensitic reverted austenite, and converes instruction is mainly distributed in lath martensite border, makes to organize disperse more, be uniformly distributed; Meanwhile, make Carbide Precipitation amount comparatively large, and small and dispersed; Wherein the first refrigerating work procedure: first adopt and air-cooledly with the rate of cooling of 6 DEG C/s, steel is chilled to 620 DEG C, adopt water-cooled, with the rate of cooling of 10 DEG C/s, molten steel is chilled to 480 DEG C again, finally adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 8 DEG C/s, steel is chilled to room temperature; Second refrigerating work procedure: first adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 12 DEG C/s, steel is chilled to 630 DEG C, adopt water-cooled, with the rate of cooling of 14 DEG C/s, molten steel is chilled to 470 DEG C again, then air cooling to 360 DEG C, finally adopts water-cooled, with the rate of cooling of 8 DEG C/s, molten steel is chilled to room temperature; 3rd refrigerating work procedure: first adopt water-cooled with the rate of cooling of 12 DEG C/s, molten steel to be chilled to 430 DEG C, then air cooling to 360 DEG C, then adopt water-cooled, with the rate of cooling of 5 DEG C/s, molten steel is chilled to room temperature.
The yield strength of the high-strength steel structural part for building curtain wall engineering manufactured by the present embodiment is 670-710MPa, tensile strength is 700-740MPa, unit elongation is 21.0-25.0%, ballistic work is 180-210J.
embodiment 3
The present embodiment is a kind of high-strength steel structural part for building curtain wall engineering, its composition and mass percent are: C:0.53%, Ni:8.70%, Mn:0.67%, Si:0.05%, P:0.007%, S:0.004%, Nb:0.11%, V:0.06%, Ti:0.13%, Al:0.09%, N:0.006%, H:0.0001%, Cu:0.035%, Cr:0.3%, Mo:0.35%, surplus is Fe and inevitable impurity; In this steel, first-phase is tempered sorbite, second-phase is reversed austenite, third phase is lath martensite, converes instruction is mainly distributed in lath martensite border, at thickness place, surface to 1/4, second-phase percent by volume is 9.7%, third phase percent by volume is 5.7%, 1/4 thickness is 8.3% to center second-phase percent by volume, and third phase percent by volume is 7.8%.
The thermal treatment process of the high-strength steel structural part for building curtain wall engineering of the present embodiment, quenching temperature is 980 DEG C, carries out in normalizing furnace, the first refrigerating work procedure is adopted to be chilled to room temperature, make to organize complete austenitizing, impurity and second phase particles back dissolving, fining austenite grains; Secondary quenching temperature is 790 DEG C, carries out in normalizing furnace, adopts the second refrigerating work procedure to be chilled to room temperature, obtains tiny ferrite and martensitic stucture; Tempering temperature is 670 DEG C, carry out in tempering stove, the 3rd refrigerating work procedure is adopted to be chilled to room temperature, obtain the tissue based on tempered sorbite, and the increasing number of reversed austenite in steel is made by martensitic reverted austenite, and converes instruction is mainly distributed in lath martensite border, makes to organize disperse more, be uniformly distributed; Meanwhile, make Carbide Precipitation amount comparatively large, and small and dispersed; Wherein, first refrigerating work procedure: first adopt and air-cooledly with the rate of cooling of 7 DEG C/s, steel is chilled to 630 DEG C, adopt water-cooled, with the rate of cooling of 11 DEG C/s, molten steel is chilled to 490 DEG C again, finally adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 9 DEG C/s, steel is chilled to room temperature; Second refrigerating work procedure: first adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 13 DEG C/s, steel is chilled to 650 DEG C, adopt water-cooled, with the rate of cooling of 15 DEG C/s, molten steel is chilled to 480 DEG C again, then air cooling to 370 DEG C, finally adopts water-cooled, with the rate of cooling of 9 DEG C/s, molten steel is chilled to room temperature; 3rd refrigerating work procedure: first adopt water-cooled with the rate of cooling of 13 DEG C/s, molten steel to be chilled to 450 DEG C, then air cooling to 370 DEG C, then adopt water-cooled, with the rate of cooling of 6 DEG C/s, molten steel is chilled to room temperature.
The yield strength of the high-strength steel structural part for building curtain wall engineering of the present embodiment is 640-680MPa, tensile strength is 670-710MPa, unit elongation is 20.0-24.0%, ballistic work is 150-180J.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of application claims.
Claims (8)
1. the high-strength steel structural part for building curtain wall engineering, it is characterized in that: its composition and mass percent are: C:0.51-0.53%, Ni:8.50-8.70%, Mn:0.65-0.67%, Si:0.03-0.05%, P:0.005-0.007%, S:0.002-0.004%, Nb:0.09-0.11%, V:0.04-0.06%, Ti:0.11-0.13%, Al:0.07-0.09%, N≤0.006%, H≤0.00020%, Cu:0.032-0.035%, Cr:0.1-0.3%, Mo:0.33-0.35%, surplus is Fe and inevitable impurity;
In this steel, first-phase is tempered sorbite, second-phase is reversed austenite, third phase is lath martensite, converes instruction is mainly distributed in lath martensite border, at thickness place, surface to 1/4, second-phase percent by volume is 9.5-9.7%, third phase percent by volume is 5.5-5.7%, and 1/4 thickness is 8.0-8.3% to center second-phase percent by volume, and third phase percent by volume is 7.5-7.8%.
2. as claimed in claim 1 for the high-strength steel structural part of building curtain wall engineering, it is characterized in that: its composition and mass percent are: C:0.51%, Ni:8.50%, Mn:0.65%, Si:0.03%, P:0.005%, S:0.002%, Nb:0.09%, V:0.04%, Ti:0.11%, Al:0.07%, N:0.006%, H:0.00020%, Cu:0.032%, Cr:0.1%, Mo:0.33%, surplus is Fe and inevitable impurity;
In this steel, first-phase is tempered sorbite, second-phase is reversed austenite, third phase is lath martensite, converes instruction is mainly distributed in lath martensite border, at thickness place, surface to 1/4, second-phase percent by volume is 9.5%, third phase percent by volume is 5.5%, 1/4 thickness is 8.0% to center second-phase percent by volume, and third phase percent by volume is 7.5%.
3. as claimed in claim 1 for the high-strength steel structural part of building curtain wall engineering, it is characterized in that: its composition and mass percent are: C:0.52%, Ni:8.60%, Mn:0.66%, Si:0.04%, P:0.006%, S:0.003%, Nb:0.10%, V:0.05%, Ti:0.12%, Al:0.08%, N:0.003%, H:0.0001%, Cu:0.033%, Cr:0.2%, Mo:0.34%, surplus is Fe and inevitable impurity;
In this steel, first-phase is tempered sorbite, second-phase is reversed austenite, third phase is lath martensite, converes instruction is mainly distributed in lath martensite border, at thickness place, surface to 1/4, second-phase percent by volume is 9.6%, third phase percent by volume is 5.6%, 1/4 thickness is 8.2% to center second-phase percent by volume, and third phase percent by volume is 7.6%.
4. as claimed in claim 1 for the high-strength steel structural part of building curtain wall engineering, it is characterized in that: its composition and mass percent are: C:0.53%, Ni:8.70%, Mn:0.67%, Si:0.05%, P:0.007%, S:0.004%, Nb:0.11%, V:0.06%, Ti:0.13%, Al:0.09%, N:0.006%, H:0.0001%, Cu:0.035%, Cr:0.3%, Mo:0.35%, surplus is Fe and inevitable impurity;
In this steel, first-phase is tempered sorbite, second-phase is reversed austenite, third phase is lath martensite, converes instruction is mainly distributed in lath martensite border, at thickness place, surface to 1/4, second-phase percent by volume is 9.7%, third phase percent by volume is 5.7%, 1/4 thickness is 8.3% to center second-phase percent by volume, and third phase percent by volume is 7.8%.
5. the thermal treatment process of the high-strength steel structural part for building curtain wall engineering as described in claim arbitrary in claim 1-4, adopt the thermal treatment process of quenching-secondary quenching-tempering, it is characterized in that: described quenching temperature is 960-980 DEG C, carry out in normalizing furnace, the first refrigerating work procedure is adopted to be chilled to room temperature, make to organize complete austenitizing, impurity and second phase particles back dissolving, fining austenite grains; Described secondary quenching temperature is 770-790 DEG C, carries out in normalizing furnace, adopts the second refrigerating work procedure to be chilled to room temperature, obtains tiny ferrite and martensitic stucture; Described tempering temperature is 650-670 DEG C, carry out in tempering stove, the 3rd refrigerating work procedure is adopted to be chilled to room temperature, obtain the tissue based on tempered sorbite, and the increasing number of reversed austenite in steel is made by martensitic reverted austenite, and converes instruction is mainly distributed in lath martensite border, makes to organize disperse more, be uniformly distributed; Meanwhile, make Carbide Precipitation amount comparatively large, and small and dispersed;
Described first refrigerating work procedure: first adopt the air-cooled rate of cooling with 5-7 DEG C/s that steel is chilled to 610-630 DEG C, adopt water-cooled, with the rate of cooling of 9-11 DEG C/s, molten steel is chilled to 470-490 DEG C again, finally adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 7-9 DEG C/s, steel is chilled to room temperature;
Described second refrigerating work procedure: first adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 11-13 DEG C/s, steel is chilled to 620-650 DEG C, adopt water-cooled, with the rate of cooling of 13-15 DEG C/s, molten steel is chilled to 460-480 DEG C again, then air cooling is to 350-370 DEG C, finally adopts water-cooled, with the rate of cooling of 7-9 DEG C/s, molten steel is chilled to room temperature;
Described 3rd refrigerating work procedure: first adopt water-cooled, with the rate of cooling of 11-13 DEG C/s, molten steel is chilled to 420-450 DEG C, then air cooling is to 350-370 DEG C, then adopts water-cooled, with the rate of cooling of 4-6 DEG C/s, molten steel is chilled to room temperature.
6. as claimed in claim 5 for the thermal treatment process of the high-strength steel structural part of building curtain wall engineering, it is characterized in that: described quenching temperature is 960 DEG C, carry out in normalizing furnace, the first refrigerating work procedure is adopted to be chilled to room temperature, make to organize complete austenitizing, impurity and second phase particles back dissolving, fining austenite grains; Secondary quenching temperature is 770 DEG C, carries out in normalizing furnace, adopts the second refrigerating work procedure to be chilled to room temperature, obtains tiny ferrite and martensitic stucture; Described tempering temperature is 650 DEG C, carry out in tempering stove, the 3rd refrigerating work procedure is adopted to be chilled to room temperature, obtain the tissue based on tempered sorbite, and the increasing number of reversed austenite in steel is made by martensitic reverted austenite, and converes instruction is mainly distributed in lath martensite border, makes to organize disperse more, be uniformly distributed; Meanwhile, make Carbide Precipitation amount comparatively large, and small and dispersed;
Described first refrigerating work procedure: first adopt and air-cooledly with the rate of cooling of 5 DEG C/s, steel is chilled to 610 DEG C, adopt water-cooled, with the rate of cooling of 9 DEG C/s, molten steel is chilled to 470 DEG C again, finally adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 7 DEG C/s, steel is chilled to room temperature;
Described second refrigerating work procedure: first adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 11 DEG C/s, steel is chilled to 620 DEG C, adopt water-cooled, with the rate of cooling of 13 DEG C/s, molten steel is chilled to 460 DEG C again, then air cooling to 350 DEG C, finally adopts water-cooled, with the rate of cooling of 7 DEG C/s, molten steel is chilled to room temperature;
Described 3rd refrigerating work procedure: first adopt water-cooled with the rate of cooling of 11 DEG C/s, molten steel to be chilled to 420 DEG C, then air cooling to 350 DEG C, then adopt water-cooled, with the rate of cooling of 4 DEG C/s, molten steel is chilled to room temperature.
7. as claimed in claim 5 for the thermal treatment process of the high-strength steel structural part of building curtain wall engineering, it is characterized in that: described quenching temperature is 970 DEG C, carry out in normalizing furnace, the first refrigerating work procedure is adopted to be chilled to room temperature, make to organize complete austenitizing, impurity and second phase particles back dissolving, fining austenite grains; Secondary quenching temperature is 780 DEG C, carries out in normalizing furnace, adopts the second refrigerating work procedure to be chilled to room temperature, obtains tiny ferrite and martensitic stucture; Described tempering temperature is 660 DEG C, carry out in tempering stove, the 3rd refrigerating work procedure is adopted to be chilled to room temperature, obtain the tissue based on tempered sorbite, and the increasing number of reversed austenite in steel is made by martensitic reverted austenite, and converes instruction is mainly distributed in lath martensite border, makes to organize disperse more, be uniformly distributed; Meanwhile, make Carbide Precipitation amount comparatively large, and small and dispersed;
Described first refrigerating work procedure: first adopt and air-cooledly with the rate of cooling of 6 DEG C/s, steel is chilled to 620 DEG C, adopt water-cooled, with the rate of cooling of 10 DEG C/s, molten steel is chilled to 480 DEG C again, finally adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 8 DEG C/s, steel is chilled to room temperature;
Described second refrigerating work procedure: first adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 12 DEG C/s, steel is chilled to 630 DEG C, adopt water-cooled, with the rate of cooling of 14 DEG C/s, molten steel is chilled to 470 DEG C again, then air cooling to 360 DEG C, finally adopts water-cooled, with the rate of cooling of 8 DEG C/s, molten steel is chilled to room temperature;
Described 3rd refrigerating work procedure: first adopt water-cooled with the rate of cooling of 12 DEG C/s, molten steel to be chilled to 430 DEG C, then air cooling to 360 DEG C, then adopt water-cooled, with the rate of cooling of 5 DEG C/s, molten steel is chilled to room temperature.
8. as claimed in claim 5 for the thermal treatment process of the high-strength steel structural part of building curtain wall engineering, it is characterized in that: described quenching temperature is 980 DEG C, carry out in normalizing furnace, the first refrigerating work procedure is adopted to be chilled to room temperature, make to organize complete austenitizing, impurity and second phase particles back dissolving, fining austenite grains; Secondary quenching temperature is 790 DEG C, carries out in normalizing furnace, adopts the second refrigerating work procedure to be chilled to room temperature, obtains tiny ferrite and martensitic stucture; Described tempering temperature is 670 DEG C, carry out in tempering stove, the 3rd refrigerating work procedure is adopted to be chilled to room temperature, obtain the tissue based on tempered sorbite, and the increasing number of reversed austenite in steel is made by martensitic reverted austenite, and converes instruction is mainly distributed in lath martensite border, makes to organize disperse more, be uniformly distributed; Meanwhile, make Carbide Precipitation amount comparatively large, and small and dispersed;
Described first refrigerating work procedure: first adopt and air-cooledly with the rate of cooling of 7 DEG C/s, steel is chilled to 630 DEG C, adopt water-cooled, with the rate of cooling of 11 DEG C/s, molten steel is chilled to 490 DEG C again, finally adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 9 DEG C/s, steel is chilled to room temperature;
Described second refrigerating work procedure: first adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 13 DEG C/s, steel is chilled to 650 DEG C, adopt water-cooled, with the rate of cooling of 15 DEG C/s, molten steel is chilled to 480 DEG C again, then air cooling to 370 DEG C, finally adopts water-cooled, with the rate of cooling of 9 DEG C/s, molten steel is chilled to room temperature;
Described 3rd refrigerating work procedure: first adopt water-cooled with the rate of cooling of 13 DEG C/s, molten steel to be chilled to 450 DEG C, then air cooling to 370 DEG C, then adopt water-cooled, with the rate of cooling of 6 DEG C/s, molten steel is chilled to room temperature.
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