CN104278210A - High nickel steel for ultralow-temperature pressure vessel and manufacturing method thereof - Google Patents

High nickel steel for ultralow-temperature pressure vessel and manufacturing method thereof Download PDF

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Publication number
CN104278210A
CN104278210A CN201310285597.4A CN201310285597A CN104278210A CN 104278210 A CN104278210 A CN 104278210A CN 201310285597 A CN201310285597 A CN 201310285597A CN 104278210 A CN104278210 A CN 104278210A
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steel
temperature
quenching
high nickel
carried out
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CN201310285597.4A
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Chinese (zh)
Inventor
朱莹光
敖列哥
侯家平
叶其斌
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Angang Steel Co Ltd
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Angang Steel Co Ltd
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Priority to CN201310285597.4A priority Critical patent/CN104278210A/en
Publication of CN104278210A publication Critical patent/CN104278210A/en
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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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • 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
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium

Abstract

The invention discloses high nickel steel for an ultralow-temperature pressure vessel and a manufacturing method thereof. The high nickel steel comprises the following chemical components, by weight, 0.01-0.08% of C, Si being less than or equal to 0.05%, 0.90-1.20% of Mn, 7.00-7.50% of Ni, 0.05-0.10% of Mo, 0.30-0.60% of Cr, 0.01-0.03% of Ti, S being less than or equal to 0.005%, P being less than or equal to 0.008% and the balance Fe and impurities. Two-stage controlled rolling is adopted. First-stage rolling temperature is greater than or equal to 1050 DEG C, secondary-stage rolling temperature is greater than or equal to 850 DEG C, finish rolling temperature is 750+/-20 DEG C, and air cooling is carried out after rolling; thermal insulation is carried out for 2min/mm at 800-850 DEG C and quenching is carried out, thermal insulation is carried out for 2min/mm at 630-700 DEG C and quenching is carried out, thermal insulation is carried out for 4min/mm at 550-600 DEG C and tempering is carried out, and air cooling is finally carried out. The high nickel steel for an ultralow-temperature pressure vessel can replace 9% Ni steel. Thus, manufacturing cost of steel for an LNG storage tank is reduced, and direct economic benefit can be created.

Description

A kind of very low temperature pressurized vessel High Nickel Steel and manufacture method thereof
Technical field
The invention belongs to high quality steel and manufacture field, particularly relate to very low temperature pressurized vessel High Nickel Steel and manufacture method thereof that one is suitable for natural gas liquids (LNG) storage tank.
Background technology
Along with in worldwide to the expanding day of Natural gas consumption, the demand of building natural gas liquids (LNG) storage tank 9%Ni steel is also being increased sharply.9%Ni steel due to its Ni content reach 9% and make its cost remain high, its product is difficult to push market, about in No. 1st, " Institute of Welding's collection of thesis " the 28th volume of the report publication in current rarely seen Japanese 2010 of 7%Ni steel " Development of 7%Ni-TMCP Steel Plate for LNG Storage tanks ".Its chemical composition is by weight percentage: C:0.05%, Si:0.05%, Mn:0.80%, Ni:7.10%, Cr:0.41%, Mo:0.04%.Wen Zhong, author does not provide the composition range of 7%Ni steel, and the stove 7%Ni test steel just smelted with regard to it describes its manufacturing process and the performance comparison situation with 9%Ni steel thereof.Author proposes, the finishing temperature of 7%Ni steel controlled rolling needs to be strict controlled near Ar3, namely about 650 DEG C, and which increase the load of milling train, improve the difficulty of rolling, and author does not provide concrete controlled rolling process, and from the viewpoint of improving intensity and the toughness of steel, its Mn, Mo content is on the low side.
Summary of the invention
The object of this invention is to provide a kind of very low temperature pressurized vessel High Nickel Steel for alternative 9%Ni steel and manufacture method thereof.Adopt the composition range of 7%Ni steel, suitably improve the content of Mn and Mo, and add a small amount of Ti, in conjunction with concrete controlled rolling process, produce and meet natural gas liquids (LNG) storage tank steel.
Very low temperature pressurized vessel High Nickel Steel involved in the present invention, its chemical composition is by weight percentage: C:0.01 ~ 0.08%, Si :≤0.05%, Mn:0.90 ~ 1.20%, Ni:7.00 ~ 7.50%, Mo:0.05 ~ 0.10%, Cr:0.30 ~ 0.60%, Ti:0.01 ~ 0.03%, S :≤0.005%, P :≤0.008%, surplus is Fe and impurity;
The Composition Design scheme of this very low temperature pressurized vessel High Nickel Steel is:
(1) carbon: carbon improves hardness of steel the most effective chemical element, but simultaneously, carbon significantly can reduce the toughness of steel, destroys the welding property of steel, integrated survey, carbon content control is suitable for very low temperature pressurized vessel High Nickel Steel within 0.08%;
(2) silicon: silicon to the toughness of steel and welding property unfavorable, its content is for should reduce very low temperature pressurized vessel High Nickel Steel and ensure that it is below 0.05% as far as possible;
(3) manganese: manganese can improve intensity and the toughness of steel, but when Fe content is too high, can grain growth be promoted, and produce temper brittleness, Fe content should control 0.90 ~ 1.20%;
(4) nickel: nickel can improve the intensity of steel, can make again steel obtain excellent low-temperature flexibility, and nickel belongs to unlimited and expands one of element of austenitic area, therefore, High Nickel Steel, after modifier treatment, can obtain the tempered sorbite tissue of complete refinement, the obdurability coupling of steel is good, but nickel belongs to scarce resource, expensive, experiment confirms, nickel content controls 7.00 ~ 7.50%, then is aided with appropriate molybdenum, chromium, titanium, and the over-all properties of steel can realize being equal to 9%Ni steel;
(5) molybdenum: molybdenum can make the grain refining of steel, significantly improves the hardening capacity of steel, suppresses steel belt roof bolt fragility, thus improves the intensity of steel, and improve the toughness of steel, therefore, its content should control within 0.05 ~ 0.10%;
(6) chromium: chromium can improve the hardening capacity of steel, thus the intensity improving steel, but chromium belongs to one of element reducing austenitic area, and chromium significantly improves the brittle transition temperature of steel, therefore, chromium content should control 0.30 ~ 0.60%;
(7) titanium: titanium is the strong reductor in steel, effectively can reduce the oxygen level in steel, thus improve the toughness of steel, and make the dense internal organization of steel, crystal grain thinning, and a small amount of titanium content can reduce aging sensitivity and the cold shortness of steel, improving welding property;
(8) sulphur: sulphur easily forms FeS and MnS and is mingled with in steel, produces hot-short phenomenon, significantly reduces the toughness of steel, therefore, should reduce the sulphur content in steel as far as possible;
(9) phosphorus: phosphorus normal segregation in steel, in crystal boundary, destroys the continuity of matrix, significantly reduces the toughness of steel, welding property is degenerated, easily produce cold short, therefore, should reduce the phosphorus content in steel as far as possible.
The manufacture method of very low temperature pressurized vessel High Nickel Steel of the present invention is:
(1) converter+refining (LF+VD): converter steelmaking process accomplishes that carbon temperature is coordinated, the accurate control composition of LF refining process, VD refining process ensures gas content in steel, and the dwell time is not more than 30 minutes, requires [H]≤2ppm;
(2) strand heating: total heat-up time must not more than 4 hours, and rate of heating calculated by heat-up time;
(3) rolling: adopt two-stage control rolling, one-phase start rolling temperature >=1050 DEG C, two-stage start rolling temperature >=850 DEG C, finishing temperature 750 ± 20 DEG C rolls rear air cooling.
For the recrystallization zone rolling of first stage higher than 1050 DEG C, be have enough extensions in order to ensure austenite, give full play to the strengthening effect of controlled rolling; For higher than the Unhydrated cement rolling of 850 DEG C, be to increase ferritic effective forming core area, fining ferrite grains; Finishing temperature control both can avoid rolling at about 750 DEG C after grain growth in process air cooler, the load of milling train can be alleviated again;
(4) quenching+quenching+tempering thermal treatment: room temperature steel plate is entered process furnace, in 800 ~ 850 DEG C of insulation 2min/mm quenching, in 630 ~ 700 DEG C of insulation 2min/mm quenching, air cooling after 550 ~ 600 DEG C of insulation 4min/mm tempering.The object of first time quenching obtains martensitic stucture, because the martensite transformation temperature of High Nickel Steel is lower, so some austenite structure exists in tissue after quenching.At the temperature of second time quenching, High Nickel Steel is ferrite+austenitic duplex structure, its objective is and makes the further refinement of the tissue of steel by phase transformation recrystallize.The object of tempering is the tissue obtained based on tempered sorbite, and by martensitic reverted austenite, austenitic amount in steel is increased, and makes the toughness of steel increase further.
The positively effect of feature of the present invention and generation is:
(1) the very low temperature pressurized vessel High Nickel Steel adopting the technical program to manufacture, its yield strength >=590MPa, tensile strength >=680MPa, unit elongation >=20%, relative reduction in area >=50% ,-196 DEG C of V-type ballistic work >=100J, side expands >=1.0;
(2) Mn content brings up to 0.90 ~ 1.20%, has ensured intensity and the toughness of steel further;
(3) Mo content brings up to 0.05 ~ 0.10%, has ensured the intensity of steel further;
(4) add a small amount of Ti, reduce the oxygen level in steel, and make the dense internal organization of steel, crystal grain thinning, improve the toughness of steel;
(5) provide concrete controlled rolling process, finishing temperature brings up to about 750 DEG C, reduces the difficulty of rolling;
(6) controlled rolling and heat treatment step, is consider for the control of steel plate grain-size and microtexture, ensure that intensity and the low-temperature flexibility of steel plate.
The present invention is used for the very low temperature pressurized vessel High Nickel Steel substituting 9%Ni steel, reduces the manufacturing cost of LNG storage tank steel, can create direct economic benefit.
Accompanying drawing explanation
Fig. 1 be 4% nital corrosion by example 1 scheme manufacture steel plate opticmicroscope under macrograph;
Fig. 2 is the macrograph of steel plate under scanning electron microscope manufactured by example 4 scheme of 4% nital corrosion.
Embodiment
Below in conjunction with specific embodiment, implementation result of the present invention is described
The chemical composition of very low temperature pressurized vessel High Nickel Steel is in table 1.
Adopt 100 tons of Bofs, smelting process accomplishes that carbon temperature is coordinated; LF refining process adjusting component; VD refining process pressurize 25 minutes, ensures [H]≤2ppm.
Table 1 very low temperature pressurized vessel High Nickel Steel chemical composition wt%
C Si Mn P S Ni Mo Cr Ti
Embodiment 1 0.060 0.02 0.95 0.005 0.002 7.10 0.06 0.40 0.015
Embodiment 2 0.071 0.03 1.20 0.005 0.002 7.20 0.08 0.45 0.017
Embodiment 3 0.068 0.05 1.00 0.005 0.002 7.17 0.08 0.40 0.020
Embodiment 4 0.072 0.04 0.93 0.005 0.002 7.45 0.07 0.43 0.021
Comparative example 1 0.055 0.02 0.80 0.005 0.002 7.22 0.03 0.50 0.015
Comparative example 2 0.062 0.05 0.75 0.005 0.002 7.35 0.02 0.52 0.018
Strand heats 3.5 hours, steel rolling of coming out of the stove.Actual controlled rolling process, in table 2, rolls rear air cooling.
Table 2 very low temperature pressurized vessel High Nickel Steel controlled rolling technique
One-phase start rolling temperature DEG C Two-stage start rolling temperature DEG C Finishing temperature DEG C
Embodiment 1 1050 850 750
Embodiment 2 1060 850 730
Embodiment 3 1050 860 760
Embodiment 4 1050 870 750
Comparative example 1 1055 860 730
Comparative example 2 1050 855 740
Thermal treatment, enters process furnace by room temperature steel plate, to embodiment 1,2 and comparative example 1, in 820 DEG C of insulation 2min/mm quenching, in 700 DEG C of insulation 2min/mm quenching, and air cooling after 560 DEG C of insulation 4min/mm tempering; To embodiment 3,4 and comparative example 2, in 820 DEG C of insulation 2min/mm quenching, in 660 DEG C of insulation 2min/mm quenching, air cooling after 590 DEG C of insulation 4min/mm tempering.
Plate property is in table 3.
Table 3 very low temperature pressurized vessel High Nickel Steel performance
As shown in Figure 1, with the macrograph under the steel plate opticmicroscope of example 1 scheme of the pressing manufacture of 4% nital corrosion; Steel plate microtexture is tempered sorbite.
As shown in Figure 2, with the macrograph of steel plate under scanning electron microscope that example 4 scheme of pressing of 4% nital corrosion manufactures.Steel plate microtexture is tempered sorbite.

Claims (2)

1. a very low temperature pressurized vessel High Nickel Steel, it is characterized in that, chemical composition is by weight percentage: C:0.01% ~ 0.08%, Si :≤0.05%, Mn:0.90% ~ 1.20%, Ni:7.00% ~ 7.50%, Mo:0.05% ~ 0.10%, Cr:0.30% ~ 0.60%, Ti:0.01 ~ 0.03%, S :≤0.005%, P :≤0.008%, surplus is Fe and impurity.
2. a manufacture method for very low temperature pressurized vessel High Nickel Steel described in claim 1, is characterized in that comprising the steps:
(1) converter+refining: converter steelmaking process accomplishes that carbon temperature is coordinated, the accurate control composition of LF refining process, VD refining process ensures gas content in steel, and the dwell time is not more than 30 minutes, requires [H]≤2ppm;
(2) strand heating: total heat-up time must not more than 4 hours;
(3) rolling: adopt two-stage control rolling, one-phase start rolling temperature >=1050 DEG C, two-stage start rolling temperature >=850 DEG C, finishing temperature 750 ± 20 DEG C rolls rear air cooling;
(4) quenching+quenching+tempering thermal treatment: room temperature steel plate is entered process furnace, in 800 ~ 850 DEG C of insulation 2min/mm quenching, in 630 ~ 700 DEG C of insulation 2min/mm quenching, air cooling after 550 ~ 600 DEG C of insulation 4min/mm tempering.
CN201310285597.4A 2013-07-08 2013-07-08 High nickel steel for ultralow-temperature pressure vessel and manufacturing method thereof Pending CN104278210A (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106756580A (en) * 2016-11-25 2017-05-31 常熟市龙腾特种钢有限公司 A kind of ultralow warm forging 06Ni9DR steel ingots and its production method
CN107604255A (en) * 2017-08-02 2018-01-19 江阴兴澄特种钢铁有限公司 A kind of the 9Ni low-temperature (low temperature) vessel steel plates peculiar to vessel and its manufacture method of high flaw detection quality
CN109023124A (en) * 2018-10-17 2018-12-18 东北大学 LNG storage tank steel plate of high welding heat influence area toughness and preparation method thereof
CN109136769A (en) * 2018-10-17 2019-01-04 东北大学 Low-nickel type LNG storage tank steel plate based on QT technique and preparation method thereof
CN109694987A (en) * 2017-10-20 2019-04-30 鞍钢股份有限公司 A kind of ultralow temperature pressure vessel high nickel steel and its manufacturing method
CN110863135A (en) * 2019-10-30 2020-03-06 鞍钢股份有限公司 High-nickel steel for low-temperature container and manufacturing method thereof
CN111492084A (en) * 2017-12-24 2020-08-04 株式会社Posco Low-temperature steel material having excellent toughness of welded part and method for producing same
CN112647021A (en) * 2020-12-09 2021-04-13 上海电气上重铸锻有限公司 High-strength 9% Ni steel for ultralow-temperature engineering fastener and preparation method thereof
CN113195748A (en) * 2018-12-19 2021-07-30 安赛乐米塔尔公司 Low temperature pressure vessel formed of low carbon, high strength 9% nickel steel

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CN102719733A (en) * 2011-03-29 2012-10-10 鞍钢股份有限公司 Manufacturing method for high-nickel steel
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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106756580B (en) * 2016-11-25 2018-04-03 常熟市龙腾特种钢有限公司 A kind of ultralow warm forging 06Ni9DR steel ingots and its production method
CN106756580A (en) * 2016-11-25 2017-05-31 常熟市龙腾特种钢有限公司 A kind of ultralow warm forging 06Ni9DR steel ingots and its production method
CN107604255A (en) * 2017-08-02 2018-01-19 江阴兴澄特种钢铁有限公司 A kind of the 9Ni low-temperature (low temperature) vessel steel plates peculiar to vessel and its manufacture method of high flaw detection quality
CN109694987A (en) * 2017-10-20 2019-04-30 鞍钢股份有限公司 A kind of ultralow temperature pressure vessel high nickel steel and its manufacturing method
CN111492084A (en) * 2017-12-24 2020-08-04 株式会社Posco Low-temperature steel material having excellent toughness of welded part and method for producing same
US11591679B2 (en) 2017-12-24 2023-02-28 Posco Co., Ltd Low-temperature steel material having excellent toughness in welding portion thereof and manufacturing method therefor
CN109023124A (en) * 2018-10-17 2018-12-18 东北大学 LNG storage tank steel plate of high welding heat influence area toughness and preparation method thereof
CN109136769A (en) * 2018-10-17 2019-01-04 东北大学 Low-nickel type LNG storage tank steel plate based on QT technique and preparation method thereof
CN113195748A (en) * 2018-12-19 2021-07-30 安赛乐米塔尔公司 Low temperature pressure vessel formed of low carbon, high strength 9% nickel steel
CN113195748B (en) * 2018-12-19 2023-02-17 安赛乐米塔尔公司 Low temperature pressure vessel formed of low carbon, high strength 9% nickel steel
CN110863135A (en) * 2019-10-30 2020-03-06 鞍钢股份有限公司 High-nickel steel for low-temperature container and manufacturing method thereof
CN110863135B (en) * 2019-10-30 2021-04-02 鞍钢股份有限公司 High-nickel steel for low-temperature container and manufacturing method thereof
CN112647021B (en) * 2020-12-09 2021-10-15 上海电气上重铸锻有限公司 High-strength 9% Ni steel for ultralow-temperature engineering fastener and preparation method thereof
CN112647021A (en) * 2020-12-09 2021-04-13 上海电气上重铸锻有限公司 High-strength 9% Ni steel for ultralow-temperature engineering fastener and preparation method thereof

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Application publication date: 20150114