CN104745770A - Heat treatment process capable of improving low temperature impact toughness of 9Ni steel - Google Patents
Heat treatment process capable of improving low temperature impact toughness of 9Ni steel Download PDFInfo
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Abstract
The invention discloses a heat treatment process capable of improving low temperature impact toughness of 9Ni steel. The heat treatment process are as follows: (a) quenching-dual-phase intercritical quenching-tempering (OLT) heat treatment process, wherein the quenching temperature is 830-850 DEG C, the intercritical quenching temperature is 635-655 DEG C and the tempering temperature is 560-600 DEG C; or (b) quenching-quenching-secondary tempering (QQT) heat treatment process, wherein the quenching temperature is 830-850 DEG C, the secondary tempering temperature is 735-755 DEG C, and the tempering temperature is 560-600 DEG C; or (c) normalizing-secondary normalizing-tempering (NNT) heat treatment process, wherein the normalizing temperature is 830-850 DEG C, the secondary normalizing temperature is 735-755 DEG C, and the tempering temperature is 560-600 DEG C; therefore, 9Ni steel with excellent low temperature impact toughness is obtained. The heat treatment process has the advantages that the low temperature impact toughness is improved greatly and the mechanical property of 9Ni steel is optimized while the strength of the 9Ni steel is reduced slightly, so that the 9Ni steel can completely meet the property requirement of large LNG storage cylinders.
Description
Technical field
The invention belongs to low-temperature alloy structure iron technical field of heat treatment, specifically a kind of thermal treatment process improving 9Ni steel low-temperature impact toughness.
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 is for the manufacture of the critical material in the construction of Large LNG storage tank and relevant industries, has the huge market advantage.
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.
To (the exploitation of used at ultra-low temperature 9Ni steel thick plate production technique of existing document, Northeastern University's Master's thesis, 2008, thermal treatment process is on the impact of LNG by high Ni low-temperature steel toughness, Anshan iron and steel plant technology, 2011, thermal treatment process is on the impact of high strength cupric 9Ni structure of steel and performance, iron and steel, 2011, Deng) and patent (a kind of nickel system steel for low-temperature pressure container and manufacture method thereof, CN201010501611.6, a kind of nickel system steel for low-temperature pressure container and manufacture method thereof, CN201010501611.6, Deng) retrieval, 9Ni steel heat treatment process has quenching-tempering (QT), quenching-two-phase region quenching-tempering (QLT), quenching-quenching-tempering (QQT), normalizing-normalizing-tempering (NNT), wherein, the optimum treatment process temperature parameter of its report is: QT is 800-820 DEG C of quenching, 560-580 DEG C tempering, QLT is 800-820 DEG C of quenching, 660-680 DEG C intercritical hardening, 560-580 DEG C tempering, QQT is 800-820 DEG C of quenching, 760-780 DEG C secondary quenching, 560-580 DEG C tempering, NNT is 800-820 DEG C of normalizing, 760-790 DEG C secondary normalizing, 560-580 DEG C tempering.
Pertinent literature (9Ni steel burning optimization on line process exploitation, University Of Science and Technology Of Taiyuan's journal, 2008, ultrafast cold final cooling temperature is on the impact of 9Ni steel low-temperature flexibility after reheating, New Technologies, 2010, etc.) and patent (produce the burning optimization on line method of 9Ni steel, the manufacture method of CN201310006170.6, a kind of low-carbon 9 Ni steel thick plate, CN200810010125.7, etc.) reporting the burning optimization on line of 9Ni steel, the 9Ni steel after the method thermal treatment has and improves the advantage such as intensity and toughness.Burning optimization on line directly enters equipment for Heating Processing after hot-rolled steel plate, eliminates the steel plate cooling needed for common process, reheats process, can save a large amount of energy, reduce the thermal treatment process time, correspondingly improve equipment for Heating Processing ability.
9Ni steel is by quenching cryogenic treating process (a kind of low temperature nickel Heat Treatment Of Steel quenching cryogenic treating process, CN201310291288.8), quenching chilling and liquid nitrogen deep process are carried out to 9Ni steel, and through low-temperaturetempering, the intensity of 9Ni low-temperature steel, toughness and hardness can be increased substantially.
Along with the fast development of industrial gas oil, 9Ni steel rate of utilization is increased significantly, by above-mentioned 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:
Low-temperature impact toughness for 9Ni steel in prior art is not enough, how to change tissue morphology by thermal treatment process, namely reversed austenite how is made to separate out in flake at martensite lath intergranular, and be evenly distributed, and then improve the thermostability of reversed austenite, thus make crystal boundary and matrix malleableize, significantly improve 9Ni steel low-temperature impact toughness.
The technical scheme that the present invention solves above technical problem is:
Improve a thermal treatment process for 9Ni steel low-temperature impact toughness, adopt the thermal treatment process of (a) quenching-two-phase region intercritical hardening-tempering (QLT), wherein, 830-850 DEG C of quenching, 635-655 DEG C of intercritical hardening, 560-600 DEG C of tempering; Or the thermal treatment process of (b) quenching-secondary quenching-tempering (QQT), wherein, 830-850 DEG C of quenching, 735-755 DEG C of secondary quenching, 560-600 DEG C of tempering; Or the thermal treatment process of (c) normalizing-secondary normalizing-tempering (NNT), 830-850 DEG C of normalizing, 735-755 DEG C of secondary normalizing, 560-600 DEG C of tempering.
First time quenching or normalizing temperature bring up to 830-850 DEG C, make to organize complete austenitizing, impurity and second phase particles back dissolving, fining austenite grains.
Second time intercritical hardening temperature is reduced to 635-655 DEG C, and at lower Ac1-Ac3 temperature intercritical hardening, object obtains tiny ferrite and martensitic stucture by phase transformation recrystallize; Second time quenching temperature is reduced to 735-755 DEG C, is quenching slightly higher than Ac3 temperature, and object is obtain more tiny martensitic stucture; Second time normalizing temperature is reduced to 735-755 DEG C, and slightly higher than the normalizing of Ac3 temperature, object is obtain lath martensite tissue.
Tempering temperature is 560-600 DEG C, make the tissue that steel obtains based on tempered sorbite, and made the increasing number of reversed austenite in steel by martensitic reverted austenite, and converes instruction is mainly distributed in lath martensite border, makes to organize disperse more, is uniformly distributed; Meanwhile, make Carbide Precipitation amount comparatively large, and small and dispersed.
Wherein, Quench heating carries out in normalizing furnace, completes in Cooling Process; Normalizing heating carries out in normalizing furnace, completes in process air cooler; Tempering heating carries out in tempering stove, completes in process air cooler.
The present invention also proposes a kind of 9Ni steel preparation method adopting following thermal treatment process; Adopt the 9Ni steel that above preparation method obtains simultaneously.
The invention has the beneficial effects as follows: the present invention is by expanding the temperature difference of QL, QQ, NN in QLT, QQT, NNT, raising first time quenching or normalizing temperature are to 830-850 DEG C, reduce second time intercritical hardening temperature to 635-655 DEG C or reduce second time quenching temperature to 735-755 DEG C or reduction for the second time normalizing temperature to 735-755 DEG C, then 560-600 DEG C of tempering, on the one hand, reversed austenite is separated out in flake at martensite lath intergranular, is evenly distributed; On the other hand, because reversed austenite rich Ni amount is higher, and then improve the thermostability of reversed austenite, thus make crystal boundary and matrix malleableize, 9Ni steel low-temperature impact toughness can be significantly improved, do not reduce or reduce intensity a little simultaneously.
Embodiment
Embodiment 1
The present embodiment is a kind of manufacture method improving the thermal treatment process of 9Ni steel low-temperature impact toughness, adopts quenching-two-phase region quenching-tempering (QLT) technique, 830-850 DEG C of quenching, 635-655 DEG C intercritical hardening, 560-600 DEG C tempering; Quench heating carries out in normalizing furnace, complete in Cooling Process, tempering heating be carry out in tempering stove, complete in process air cooler.The yield strength of the 9Ni steel manufactured by the present embodiment is 590-630MPa, tensile strength is 680-720MPa, unit elongation is 26.0-30.0%, ballistic work is 200-230J.Concrete technology contrast is as shown in table 1:
Table 1 expands the mechanical property after the QL temperature difference
Embodiment 2
The present embodiment is a kind of manufacture method improving the thermal treatment process of 9Ni steel low-temperature impact toughness, adopts quenching-quenching-tempering (QQT) technique, and 830-850 DEG C of quenching, a 735-755 DEG C secondary are quenched, 560-600 DEG C tempering; Quench heating carries out in normalizing furnace, complete in Cooling Process, tempering heating be carry out in tempering stove, complete in process air cooler.The yield strength of the 9Ni steel 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.Concrete technology contrast is as shown in table 2:
Table 2 expands the mechanical property after the QQ temperature difference
Embodiment 3
The present embodiment is a kind of manufacture method improving the thermal treatment process of 9Ni steel low-temperature impact toughness, adopts normalizing-normalizing-tempering (NNT) technique, 830-850 DEG C of normalizing, 735-755 DEG C secondary normalizing, 560-600 DEG C tempering; Normalizing heating be carry out in normalizing furnace, complete in process air cooler, tempering heating be carry out in tempering stove, complete in process air cooler.The yield strength of the 9Ni steel manufactured by the present embodiment is 640-680MPa, tensile strength is 670-710MPa, unit elongation is 20.0-24.0%, ballistic work is 150-180J.Concrete technology contrast is as shown in table 3:
Table 3 expands the mechanical property after the NN temperature difference
Owing to adopting technique scheme, the 9Ni steel that this embodiment manufactures, by expanding QLT, QQT, QL in NNT, QQ, the temperature difference of NN, namely raising first time quenching or normalizing temperature are to 830-850 DEG C, reduce intercritical hardening temperature to 635-655 DEG C, or reduce second time quenching temperature to 735-755 DEG C, or reduce second time normalizing temperature to 735-735 DEG C, then 560-600 DEG C of tempering, make the tissue that steel obtains based on tempered sorbite, and make to form reversed austenite in steel by martensitic reverted austenite, on the one hand, reversed austenite is separated out in flake at martensite lath intergranular, be evenly distributed, on the other hand, because its rich Ni amount is higher, and then improve the thermostability of reversed austenite, thus make crystal boundary and matrix malleableize, can low-temperature impact toughness be significantly improved, do not reduce or reduce intensity a little simultaneously.Can as the critical material manufactured in the construction of Large LNG storage tank and relevant industries.
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 (9)
1. one kind is improved the thermal treatment process of 9Ni steel low-temperature impact toughness, adopt the thermal treatment process of quenching-two-phase region intercritical hardening-tempering, it is characterized in that: described quenching temperature is 830-850 DEG C, two-phase region intercritical hardening temperature is 635-655 DEG C, and described tempering temperature is 560-600 DEG C.
2. the thermal treatment process improving 9Ni steel low-temperature impact toughness as claimed in claim 1, is characterized in that:
830-850 DEG C is brought up in first time quenching, makes to organize complete austenitizing, impurity and second phase particles back dissolving, fining austenite grains;
Second time intercritical hardening temperature is reduced to 635-655 DEG C, at lower Ac1-Ac3 temperature intercritical hardening, obtains tiny ferrite and martensitic stucture by phase transformation recrystallize;
Tempering temperature is 560-600 DEG C, make the tissue that steel obtains based on tempered sorbite, and made the increasing number of reversed austenite in steel by martensitic reverted austenite, and converes instruction is mainly distributed in lath martensite border, makes to organize disperse more, is uniformly distributed; Meanwhile, make Carbide Precipitation amount comparatively large, and small and dispersed.
3. one kind is improved the thermal treatment process of 9Ni steel low-temperature impact toughness, adopt the thermal treatment process of quenching-secondary quenching-tempering, it is characterized in that: described quenching temperature is 830-850 DEG C, described secondary quenching temperature is 735-755 DEG C, and described tempering temperature is 560-600 DEG C.
4. the thermal treatment process improving 9Ni steel low-temperature impact toughness as claimed in claim 3, is characterized in that:
Quenching temperature brings up to 830-850 DEG C for the first time, makes to organize complete austenitizing, impurity and second phase particles back dissolving, fining austenite grains;
Second time quenching temperature is reduced to 735-755 DEG C, slightly higher than the quenching of Ac3 temperature, obtains more tiny martensitic stucture;
Tempering temperature is 560-600 DEG C, make the tissue that steel obtains based on tempered sorbite, and made the increasing number of reversed austenite in steel by martensitic reverted austenite, and converes instruction is mainly distributed in lath martensite border, makes to organize disperse more, is uniformly distributed; Meanwhile, make Carbide Precipitation amount comparatively large, and small and dispersed.
5. one kind is improved the thermal treatment process of 9Ni steel low-temperature impact toughness, adopt the thermal treatment process of normalizing-secondary normalizing-tempering, it is characterized in that: described normalizing temperature is 830-850 DEG C, described secondary normalizing temperature is 735-755 DEG C, and described tempering temperature is 560-600 DEG C.
6. the thermal treatment process improving 9Ni steel low-temperature impact toughness as claimed in claim 5, is characterized in that:
Normalizing temperature brings up to 830-850 DEG C for the first time, makes to organize complete austenitizing, impurity and second phase particles back dissolving, fining austenite grains;
Second time normalizing temperature is reduced to 735-755 DEG C, slightly higher than the normalizing of Ac3 temperature, obtains lath martensite tissue;
Tempering temperature is 560-600 DEG C, make the tissue that steel obtains based on tempered sorbite, and made the increasing number of reversed austenite in steel by martensitic reverted austenite, and converes instruction is mainly distributed in lath martensite border, makes to organize disperse more, is uniformly distributed; Meanwhile, make Carbide Precipitation amount comparatively large, and small and dispersed.
7. the thermal treatment process of the raising 9Ni steel low-temperature impact toughness as described in claim arbitrary in claim 1-6, is characterized in that: wherein Quench heating carries out in normalizing furnace, completes in Cooling Process; Normalizing heating carries out in normalizing furnace, completes in process air cooler; Tempering heating carries out in tempering stove, completes in process air cooler.
8. comprise the 9Ni steel preparation method of thermal treatment process according to any one of claim 1-7 middle term.
9. the 9Ni steel that obtains of preparation method according to claim 8.
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| CN106399653A (en) * | 2016-09-27 | 2017-02-15 | 中国科学院理化技术研究所 | Method for improving impact toughness of 1Ni9 low-temperature steel |
| CN107227395A (en) * | 2017-07-31 | 2017-10-03 | 青岛大学 | A kind of heat treatment technics for improving the martensite type refractory steel low-temperature flexibility containing large scale M23C6 precipitated phases |
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| CN113106351A (en) * | 2021-04-20 | 2021-07-13 | 吉安锐迈管道配件有限公司 | Ultralow-temperature 9Ni steel and preparation process thereof |
| CN115094204A (en) * | 2022-07-18 | 2022-09-23 | 重庆齿轮箱有限责任公司 | Heat treatment method of medium carbon alloy steel |
| CN115354125A (en) * | 2022-08-23 | 2022-11-18 | 通用技术集团大连机床有限责任公司 | Heat treatment method of 30CrNiMo8 quenched and tempered steel |
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