CN102796957B - Steel plate for high toughness 15CrMoR pressure container - Google Patents

Steel plate for high toughness 15CrMoR pressure container Download PDF

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Publication number
CN102796957B
CN102796957B CN201210316263.4A CN201210316263A CN102796957B CN 102796957 B CN102796957 B CN 102796957B CN 201210316263 A CN201210316263 A CN 201210316263A CN 102796957 B CN102796957 B CN 102796957B
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steel
rolling
less
temperature
steel plate
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CN201210316263.4A
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CN102796957A (en
Inventor
孙卫华
邵正伟
成小龙
孙风晓
刘晓东
刘金泉
郑淑胜
朱延山
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Jinan Iron and Steel Group Co Ltd
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Jinan Iron and Steel Group Co Ltd
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Abstract

The invention relates to the manufacturing field of steel for a chrome-molybdenum heat resistant pressure container, in particular to a steel plate for a high toughness 15CrMoR pressure container. The steel plate is prepared by the following components in percentage by mass: 0.14-0.18% of C (Carbon), 0.15-0.40% of Si (Silicon), 0.45-0.70% of Mn (Manganese), no more than 0.020% of P (Phosphorus), no more than 0.005% of S (Sulfur), 0.90-1.10% of Cr (Chromium), 0.45-0.60% of Mo (Molybdenum) and the balance of Fe (Ferrum) and inevitable impurities. The steel plate for the high toughness 15CrMoR pressure container, provided by the invention, has the advantages as follows: (1) as impact toughness of 15CrMoR is high, low temperature impact performance is that transverse impact is not less than 80 J at -40 DEG C and far higher than the nationally specified transverse impact; (2) pure steel quality and low content of harmful elements such as S and the like; (3) as refined grain elements, such as Nb, V, Ti and the like, are not added, cost is greatly saved; and (4) when a requirement on low temperature toughness is satisfied, good conventional properties and good high-temperature tensile properties are obtained.

Description

A kind of high tenacity 15CrMoR steel heavy plate for pressure vessels
Technical field
The present invention relates to chromium-molybdenum is that heat-resisting steels for pressure vessel use is manufactured field, specifically refers to a kind of high tenacity 15CrMoR steel heavy plate for pressure vessels.
Background technology
15CrMoR steel is the middle temperature and pressure force container steel grade that petrochemical equipment is conventional, owing to working under higher temperature and pressure, therefore its service condition is severe, requires material will have higher heat resistance, good toughness plasticity, erosion resistance and welding property.
Although 15CrMoR high temperature steel pressurized vessel great majority are at high temperature to work, but will even may under extreme climate, carry out the water test of 1.25 times of pressure of design pressure at normal temperatures after pressurized vessel and pipeline manufacture completion, and after installation and repairing is complete, also to experience the water test and Cold Start, therefore, this steel grade also will have certain anti-brittle failure on the basis that guarantees its fundamental property.In addition, the container that this steel grade is manufactured is at high temperature operation for a long time, during parking, without preventing reliably the too fast measure of lowering the temperature, causes thermal fatigue and temperature stress large, so also will consider its toughness deposit when this steel grade of design, the ability of its resistance to deformation and temperature variation is strengthened.Conventional 15CrMoR container steel is according to stipulating in GB713-2008, and impelling strength requires to reach 20 ℃ of transverse impact >=31J, far can not meet certain user's particular requirement, makes the application of this steel grade be subject to certain restriction.
Summary of the invention
The object of the present invention is to provide a kind of high tenacity 15CrMoR steel heavy plate for pressure vessels.
The present invention is achieved by the following technical solutions:
A kind of high tenacity 15CrMoR steel heavy plate for pressure vessels, component by following mass percent is prepared from: C:0.14~0.18%, Si:0.15~0.40%, Mn:0.45~0.70%, P≤0.020%, S≤0.005%, Cr:0.90~1.10%, Mo:0.45~0.60%, other are Fe and inevitable impurity.
Above-mentioned steel plate thickness is 10~80mm, and the steel plate thickness of optimization is 20~60mm.
Above-mentioned high tenacity 15CrMoR steel heavy plate for pressure vessels, they are transverse impact >=80J in the time of-40 ℃.
The preparation method of above-mentioned a kind of high tenacity 15CrMoR steel heavy plate for pressure vessels, its concrete steps are:
1) smelt: raw material is through molten iron KR pretreatment desulfurizing, the massfraction of sulphur is reduced to below 0.003%, through 120t top and bottom combined blown converter smelting, after ladle argon-blown, send into again the refining of LF refining furnace, carry out trimming, desulfurization makes massfraction≤0.005% of sulphur again, and temperature control to 1600~1650 ℃, then in VD stove, carry out Fruit storage, reduce oxygen, nitrogen and hydrogen content, make [O]≤30PPM, [N]≤40PPM, [H]≤2PPM, and further even composition, protect vacuum time and be not less than 15 minutes, after finishing, processing utilize feeding wire machine to feed fast calcium iron wire 2m/t with 180~210m/min speed, after line feeding, molten steel is carried out stirring a little less than soft blow argon, soft argon blowing time is not less than 10 minutes, argon gas stream 80~150L/min, molten steel composition after processing guarantees P≤0.020%, S≤0.005%.
2) casting: upper 270mm * 2100mm sectional board billet continuous casting machine cast after VD stove vacuum breaker, in casting process, casting machine adopts Segment Electromagnetic Stirring and the light soft reduction process of strand, and after continuously cast bloom rolls off the production line, the stacking slow cooling time is not less than 48 hours;
3) heating: strand is at stove coefficient heat-up time 0.9~1.1min/mm; 1140~1200 ℃ of the tapping temperatures of steel billet;
4) rolling: in the operation of rolling, rolling adopts thick, finish rolling rolling stage by stage, roughing mill start rolling temperature >=1100 ℃, adopt low speed to depress greatly rolling technology, guarantee [10,50] workpiece thickness of mm specification is not less than 2.5 times of finished product thickness, (50,80] workpiece thickness of mm specification is not less than 2 times of finished product thickness, steel plate finish rolling below thickness 12mm is temperature control not, 12mm is with upper steel plate finish rolling start rolling temperature by 900~980 ℃ of controls, and finishing temperature is by 840~920 ℃ of controls, air cooling after steel plate rolling;
5) thermal treatment: normalizing treatment temperature is 890~930 ℃, in-furnace time 1.4~1.8min/mm and the minimum 30min that is not less than; 600~700 ℃ of temper temperature, in-furnace time 2.0~3.0min/mm and the minimum 60min that is not less than, steel plate come out of the stove after air cooling to room temperature, now steel plate thickness is 10~80mm.
High tenacity 15CrMoR steel heavy plate for pressure vessels of the present invention, by pure steel, optimize temperature-controlled rolling and thermal treatment process, obtain desirable perlite+ferritic structure, its uniform crystal particles is tiny, at normal temperature, stretch, on the basis of high temperature tensile properties conformance with standard GB713-2008, greatly improved its impelling strength,-40 ℃ of transverse impact merit >=80J, impact test temperature reaches 60 ℃ lower than 20 ℃ of GB regulation, and ballistic work reaches as high as 137J, can reach 3~4 times of GB prescribed value, the processing and manufacturing of user under particular surroundings and the toughness reserve requirements of use have been met.
The present invention has the following advantages: (1) 15CrMoR impelling strength is high, and low temperature impact properties reaches-40 ℃ of transverse impact >=80J, far above GB, stipulates.(2) steel of the present invention is pure, and the harmful element content such as S are low; (3) do not add the crystal grain thinning elements such as Nb, V, Ti, greatly saved cost; (4), under the requirement that meets low-temperature flexibility, traditional performance and high temperature tensile properties are good;
Embodiment
By following specific embodiment, further illustrate the present invention:
Embodiment mono-
The high tenacity 15CrMoR steel heavy plate for pressure vessels of the present embodiment is that the component by following mass percent is prepared from: C:0.18%, Si:0.23%, Mn:0.55%; P:0.016%, S:0.002%, Cr:1.03%; Mo:0.46%, surplus is Fe and inevitable impurity;
The preparation method of the high tenacity 15CrMoR steel heavy plate for pressure vessels of the present embodiment is as follows:
1) smelt: after raw material molten iron KR pre-treatment, through top and bottom combined blown converter smelting, after ladle argon-blown, send into again the refining of LF refining furnace, then in VD stove, carry out vacuum-treat, protect vacuum time 17 minutes, processing finishes rear feeding calcium iron wire 2m/t, and after line feeding, soft blow argon is 10 minutes;
2) casting: upper continuous caster cast after VD stove vacuum breaker, in casting process, casting machine adopts Segment Electromagnetic Stirring and the light soft reduction process of strand, and after continuously cast bloom rolls off the production line, stacking slow cooling is 48 hours;
3) heating: strand time inside furnace 4 hours, 1150 ℃ of tapping temperatures;
4) rolling: adopt thick, finish rolling rolling stage by stage, rolling workpiece thickness is 100mm, 940 ℃ of finish rolling start rolling temperatures, mill product steel plate specification is 36mm;
5) thermal treatment: normalizing treatment temperature is 910 ℃, in-furnace time 55min; 650 ℃ of tempering temperatures, in-furnace time 90min, steel plate come out of the stove after air cooling.
Embodiment bis-
The high tenacity 15CrMoR steel heavy plate for pressure vessels of the present embodiment is that the component by following mass percent is prepared from: C:0.17%, Si:0.25%, Mn:0.55%, P:0.012%, S:0.002%, Cr:1.03%, Mo:0.47%, surplus is Fe and inevitable impurity.
The preparation method of the high tenacity 15CrMoR steel heavy plate for pressure vessels of the present embodiment is with embodiment mono-, and difference is that it is 15 minutes that VD stove is protected vacuum time, and strand heat-up time in stove is 4.5 hours, 1180 ℃ of tapping temperatures.
Embodiment tri-
The high tenacity 15CrMoR steel heavy plate for pressure vessels of the present embodiment is that the component by following mass percent is prepared from: C:0.17%, Si:0.27%, Mn:0.55%, P:0.017%, S:0.001%, Cr:0.94%, Mo:0.46%, surplus is Fe and inevitable impurity.
The preparation method of the high tenacity 15CrMoR steel heavy plate for pressure vessels of the present embodiment is with embodiment mono-, difference is that it is 15 minutes that VD stove is protected vacuum time, continuously cast bloom is 4.5 hours in process furnace heat-up time, 1180 ℃ of tapping temperatures, finishing mill start rolling temperature is 950 ℃, mill product steel plate specification is 40mm, normalizing treatment temperature is 920 ℃, in-furnace time is 60 minutes, and temper temperature is 660 ℃, and in-furnace time is 100 minutes.
Embodiment tetra-
The high tenacity 15CrMoR steel heavy plate for pressure vessels of the present embodiment is that the component by following mass percent is prepared from: C:0.16%, Si:0.25%, Mn:0.53%, P:0.014%, S:0.001%, Cr:0.93%, Mo:0.46%, surplus is Fe and inevitable impurity.
The preparation method of the high tenacity 15CrMoR steel heavy plate for pressure vessels of the present embodiment is with embodiment mono-, difference is that it is 15 minutes that VD stove is protected vacuum time, continuously cast bloom is 4.5 hours in process furnace heat-up time, 1180 ℃ of tapping temperatures, and rolling workpiece thickness is 130mm, finishing mill start rolling temperature is 950 ℃, mill product steel plate specification is 56mm, and normalizing treatment temperature is 920 ℃, and in-furnace time is 85 minutes, temper temperature is 660 ℃, and in-furnace time is 140 minutes.15CrMoR steel heavy plate for pressure vessels to preparation in above embodiment mono-to four carries out Mechanics Performance Testing, as shown in table 1,2,3.

Claims (3)

1. a preparation method for high tenacity 15CrMoR steel heavy plate for pressure vessels, its concrete steps are:
Smelt: raw material is through molten iron KR pretreatment desulfurizing, the massfraction of sulphur is reduced to below 0.003%, through 120t top and bottom combined blown converter smelting, after ladle argon-blown, send into again the refining of LF refining furnace, carry out trimming, desulfurization makes massfraction≤0.005% of sulphur again, and temperature control to 1600~1650 ℃, then in VD stove, carry out Fruit storage, reduce oxygen, nitrogen and hydrogen content, make [O]≤30ppm, [N]≤40ppm, [H]≤2ppm, and further even composition, protect vacuum time and be not less than 15 minutes, after finishing, processing utilize feeding wire machine to feed fast calcium iron wire 2m/t with 180~210m/min speed, after line feeding, molten steel is carried out stirring a little less than soft blow argon, soft argon blowing time is not less than 10 minutes, argon gas stream 80~150L/min, molten steel composition after processing guarantees P≤0.020%, S≤0.005%,
Casting: upper 270mm * 2100mm sectional board billet continuous casting machine cast after VD stove vacuum breaker, in casting process, continuous caster adopts Segment Electromagnetic Stirring and the light soft reduction process of strand, and after continuously cast bloom rolls off the production line, the stacking slow cooling time is not less than 48 hours;
Heating: continuously cast bloom is at stove coefficient heat-up time 0.9~1.1min/mm; 1140~1200 ℃ of the tapping temperatures of steel billet;
Rolling: in the operation of rolling, rolling adopts thick, finish rolling rolling stage by stage, roughing mill start rolling temperature >=1100 ℃, adopt low speed to depress greatly rolling technology, guarantee [10,50] workpiece thickness of mm specification is not less than 2.5 times of finished product thickness, (50,80] workpiece thickness of mm specification is not less than 2 times of finished product thickness, the steel plate finish rolling that thickness is less than 12mm is temperature control not, 12mm is with upper steel plate finish rolling start rolling temperature by 900~980 ℃ of controls, and finishing temperature is by 840~920 ℃ of controls, air cooling after steel plate rolling;
Thermal treatment: normalizing treatment temperature is 890~930 ℃, in-furnace time 1.4~1.8min/mm and the minimum 30min that is not less than; 600~700 ℃ of temper temperature, in-furnace time 2.0~3.0min/mm and the minimum 60min that is not less than, steel plate come out of the stove after air cooling to room temperature, now steel plate thickness is 10~80mm, it is comprised of following component by mass percentage: C:0.14~0.18%, Si:0.15~0.40%, Mn:0.45~0.70%, P≤0.020%, S≤0.005%, Cr:0.90~1.10%, Mo:0.45~0.60%, other are Fe and inevitable impurity.
2. the preparation method of a kind of high tenacity 15CrMoR steel heavy plate for pressure vessels according to claim 1, is characterized in that: described steel plate thickness is 20~60mm.
3. the preparation method of a kind of high tenacity 15CrMoR steel heavy plate for pressure vessels according to claim 1, is characterized in that: described high tenacity 15CrMoR steel heavy plate for pressure vessels, they are transverse impact >=80J in the time of-40 ℃.
CN201210316263.4A 2012-08-31 2012-08-31 Steel plate for high toughness 15CrMoR pressure container Expired - Fee Related CN102796957B (en)

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CN103469107A (en) * 2013-09-18 2013-12-25 济钢集团有限公司 A517Gr.B large pressure steel plate with low cost and high toughness and production method thereof
CN103468872B (en) * 2013-09-18 2015-10-28 济钢集团有限公司 The thick container panel production technique of low compression bit
CN104894477A (en) * 2014-03-05 2015-09-09 鞍钢股份有限公司 15CrMoR hydrogenation equipment steel production method
CN104805380B (en) * 2015-05-06 2017-05-31 山东钢铁股份有限公司 A kind of low temper brittleness Cr Mo systems high temperature resistant Steel Used for Pressure Retaining Components plate and preparation method
CN107805757A (en) * 2016-09-09 2018-03-16 中国石化工程建设有限公司 A kind of low alloy steel and preparation method thereof
CN107159710A (en) * 2017-05-23 2017-09-15 舞阳钢铁有限责任公司 A kind of milling method of the special thickness 15CrMoR steel plates of electroslag type
CN108359894B (en) * 2018-02-23 2020-08-04 舞阳钢铁有限责任公司 Low-temperature impact resistant large-thickness low-alloy chromium-molybdenum steel plate and production method thereof
CN108359902B (en) * 2018-04-08 2019-10-11 无锡市法兰锻造有限公司 A kind of high performance alloys steel flange and forging and its manufacturing method
CN109913755B (en) * 2019-03-22 2020-09-18 山东钢铁股份有限公司 Peritectic steel and preparation method thereof
CN111926244A (en) * 2020-07-09 2020-11-13 舞阳钢铁有限责任公司 15CrMoR steel plate with good low-temperature impact toughness and production method thereof

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CN101144138B (en) * 2007-11-01 2011-05-25 济南钢铁股份有限公司 Producing method of steel plate for low temperature pressure container and thereof

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