CN103695782A - Steel with tensile strength of 630Mpa for mobile-type pressure vessel and production method thereof - Google Patents
Steel with tensile strength of 630Mpa for mobile-type pressure vessel and production method thereof Download PDFInfo
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Abstract
The invention provides steel with the tensile strength of 630Mpa for a mobile-type pressure vessel. The steel is produced by using one or a mixture of more than two of the following chemical components in percentage by weight: 0.15-0.20% of C, 0.15-0.40% of Si, 1.00-1.70% of Mn, less than or equal to 0.015% of P, less than or equal to 0.006% of S, 0.10-0.30% of Ni, 0.02-0.20% of V, 0.03-0.3% of Cu, or 0.01-0.10% of Cr or 0.008-0.020% of Ti. A production method of the steel comprises the following steps: continuously casting so as to form billet, heating, carrying out hot rolling, and carrying out thermal treatment by adopting a normalizing technology. The yield strength of the steel is greater than or equal to 460Mpa, the tensile strength of the steel is 630-730Mpa, the elongation of the steel is greater than or equal to 25%, the yield ratio of the steel is less than or equal to 0.80, and the steel has good welding properties. The hardening capacity of the steel subjected to heat and hot machining is not obvious. The steel has low requirements on welding wire energy, welded joints have good mechanical properties, and the steel lays a foundation for the enlargement and weight reduction of the mobile-type pressure vessel and is relatively low in production cost.
Description
Technical field
The present invention relates to steel and manufacture method thereof for a kind of tensile strength 630MPa level transportable pressure vessel, belong to low alloy steel and manufacture field.
Background technology
Transportable pressure vessel is divided into truck tank, tank car and tank container.The medium of transportable pressure vessel accumulating is liquefied gas, cryogenic liquid and permanent gases, as liquefied petroleum gas (LPG), oxyethane, liquid oxygen, liquefied ammonia, liquid carbon dioxide, natural gas liquids and compressed natural gas, hydrogen etc.
The transportable pressure vessel of current domestic use is with mostly being normalizing type steels for pressure vessel use in steel, compare with Foreign Advanced Lerel, external tank car tank body material generally adopts the high-strength steel of tensile strength >=610MPa level, its tank body wall thickness is less, thereby the corresponding reduction of ratio of light weight to loading capacity has improved ratio of light weight to loading capacity and the delivery efficiency of tank car.The domestic tank body materials that adopt mostly at present are the steel that tensile strength is less than 610MPa level more, cause tank body wall thickness larger, the corresponding increasing of ratio of light weight to loading capacity, and volume to weight ratio is little, and delivery efficiency is low, compares the larger gap of existence with Foreign Advanced Lerel.
Although the carbon content of common low-alloy normalizing pressure vessel steel is not high, but the content of alloying element is more, the tendency of hardenability of this class steel is larger than hot-rolled steel, welding cold cracking is more responsive than carbon steel, general steel are along with the raising welding cold crack sensitivity of intensity rank increases, and some high-strength steel that contains the carbides such as vanadium, niobium, titanium, molybdenum also has larger reheat crack(ing) tendency.Overheated zone in the heat affected zone of low-alloy normalized steel welding joint is the weak area of welding joint.During the welding of low-alloy normalized steel, when heat input is larger, can make the infusibility particles such as titanium nitride, titanium carbide dissolve in austenite, not only can make the overheated zone grain growth of heat affected zone serious, also can there is upper bainite in overheated zone, M-A constituent elements etc., add coarse grain zone metal carbon, nitrogen solid solution capacity increases, thereby make that overheated zone embrittlement, aging sensitivity increase, the toughness of welding joint declines.But the welding of steel of the present invention has solved the weak area of welding property, the particularly welding joint of different low-alloy normalizing pressure vessel steels.
China Patent Publication No. is the patent documentation of CN 1040777C, a kind of chemical composition, manufacture method and performance of large sphere steel of yield strength >=460MPa level are disclosed, the deficiency of its existence is to have added the precious alloy elements such as Cu, Nb, production cost is increased, and not mentioned its welding property situation.
China Patent Publication No. is the patent documentation of CN102719737, discloses a kind of 460 MPa grade yield strength normalizing high strength steel plate and manufacture method thereof, the actual welding of its not mentioned this steel and welding property, and the microstructure of undeclared this steel.
Chinese Patent Application No. is the patent documentation of CN 200710113574.X, discloses a kind of steel plate for low temperature pressure container and production method thereof, and the welding property of not mentioned this invention steel.
Chinese Patent Application No. is the patent documentation of CN201010200825.X, discloses a kind of manufacture method of normalizing type high-strength pressure vessel steel, tensile strength rank 570MPa, and the welding property of not mentioned this invention steel.
Summary of the invention
The object of this invention is to provide a kind of yield strength >=460MPa, tensile strength 630 ~ 730MPa, unit elongation >=25%, yield tensile ratio≤0.80, and there is good welds performance and lower steel and the production method thereof for tensile strength 630MPa level transportable pressure vessel of production cost.
Realize above-mentioned purpose
Tensile strength 630MPa level transportable pressure vessel steel, its chemical composition and weight percent are: C:0.15～0.20%, Si:0.15～0.40%, Mn:1.00～1.70%, P≤0.015%, S≤0.006%, Ni:0.10～0.30%, V: 0.02～0.20%, one or more mixing of Cu:0.03～0.30% or Cr0.01～0.10% or Ti:0.008～0.020%, and all the other are for Fe and be inevitably mingled with; Meet: 3Cr+Cu≤7Ti+3V≤3.3C, C+Si/30+Mn/20+Cu/20+Cr/20+Ni/60+V/10≤0.29 simultaneously; Mechanical property: yield strength>=460MPa, tensile strength 630 ~ 730MPa, unit elongation>=25%, yield tensile ratio≤0.80, steel plate is-50 ℃ of KV laterally
2>=150J, welded heat affecting zone-50 ℃ KV
2>=135J, metallographic structure is ferrite+perlite.
The production method of steel for production tensile strength 630MPa level transportable pressure vessel, its step:
1) through smelting also continuous casting, become after base, to strand heating, control Heating temperature at 1200～1230 ℃, control heating rate is 8～14min/cm;
2) carry out hot rolling, control start rolling temperature and be not less than 1070 ℃, control last three passage accumulative total drafts and be not less than 30%; Control finishing temperature and be not less than 860 ℃;
3) adopt normalizing process to heat-treat, control normalizing temperature at 870～930 ℃, and insulation, soaking time: 30～40 minutes+thickness of slab * 1 that the millimeter of take is unit minute/mm.
The effect of principal element of the present invention has following feature:
C:0.15~0.20%，
C is one of element of indispensable raising steel strength in steel, along with the increase of carbon content, and steel grade Fe
3c increases, and hardenability also increases, and yield strength and the tensile strength of steel are returned raising, and two unit elongation notch impact toughness return decline.The every increase by 0.1% of carbon content; Tensile strength approximately improves 90MPa, and yield strength approximately improves 40-50MPa.But along with carbon content increases, the amplitude that the unit elongation of steel and impact toughness decreased, especially low-temperature flexibility decline is larger.And, during the higher steel of welding C content, in welded heat affecting zone, also there will be the phenomenon of hardening, during the welding of Zhejiang furniture, produce the tendency of cold cracking.When in steel, C content is in being not more than 0.18% scope, the intensity that both can improve steel has applicable production operation, improves its suitability and feasibility in industrial production.
Si：0.15～0.40%，
Si can reduce the greying tendency of carbon in steel, and with solution strengthening form, improves the intensity of steel, but Si goes home, tool magazine element is in the segregation of crystal boundary, therefore its content is unsuitable high, one side reduces toughness and the weldability of steel.
Mn：1.00～1.70%，
Mn has effect significantly to improving the intensity of low-carbon (LC) and middle carbon perlitic steel.Mn containing 1% approximately can improve tensile strength 100MPa.In general, Mn content, being favourable to improving the toughness of weld metal below 2%, therefore, in low-carbon high strength steel, generally improves the content of Mn, reaches as high as 2%.In addition, Mn can also improve the solubleness in steel such as Nb, V.But Mn has the effect that promotes grain growth, to overheated more responsive, therefore should control in steel Mn content in 1.00-1.70%.
P≤0.015%、S≤0.006%，
Because the P in steel, S content must be controlled at lower scope, only has smelting Clean Steel, the performance of guarantee steel of the present invention.
Ni：0.10～0.30%，
Ni has certain strengthening effect, adds 1% Ni can improve the about 20MPa of steel strength.Ni can also improve the toughness, particularly low-temperature flexibility of steel significantly.No matter in steel, add Ni, be base material, or the low-temperature flexibility of welded heat affecting zone all obviously improves.But during Ni too high levels, can cause steel-plate iron oxide scale to be difficult to come off, steel of the present invention is controlled at 0.15～0.55%.
V?：0.02～0.20%，
V is strong carbonitride forming element, and it organizes Austenite Grain Growth and crystal grain thinning by forming carbide, improves normal temperature and the hot strength of steel.V can promote pearlitic formation, can also refinement ferrite lath.
In normalized steel, V often adds together with Nb, Ti etc., reaches the effect of crystal grain thinning by adding Nb or Ti, and one-tenth point by V separates out and gains in strength.More than V can make the strength increase 150MPa of steel.But during V too high levels, precipitate quantity increases, and size increases, thereby cause the toughness drop of steel.Steel of the present invention is controlled on V and is limited to 0.20%.
In the present invention, also contain one or more in Cu, Cr, Ti:
Cu mainly plays precipitation strength effect in steel, is conducive in addition obtain good low-temperature flexibility, increases the fatigue crack extended capability of steel.During too high levels, Plate Welding heat affected zone toughness drop, and produce check crack in steel plate rolling process, the present invention is controlled at≤and 0.30%.
Cr is the element that dwindles austenitic area, it is medium tenacity carbide forming element, in steel, can form carbide also can solid solution in ferrite, Cr still improves the effective element of steel hardenability simultaneously, the in the situation that of the compound interpolation of Cu-Cr-Ni, add Cr can improve steel welding cold crack sensitivity, being controlled at of Cr in the present invention≤0.10%.
Ti content of the present invention is chosen in≤and below 0.020%, Ti is a kind of strong carbide and nitride forming element, and it can improve room temperature strength and the hot strength of steel significantly, because Ti can play crystal grain thinning, therefore also can improve the toughness of steel.Appropriate Ti can improve the toughness of weld metal, but excessive Ti can form and be mingled with again in steel.In low-alloy high-strength steel, from improving the toughness of weld metal, consider, add 0.008～0.020% Ti comparatively suitable, the Second Phase Particles TiN, the Ti(CN that utilize Ti to form) etc. stop the grain growth of coarse grain zone, welded heat affecting zone, guarantee that welding joint has good low-temperature flexibility.
Feature of the present invention is not only yield strength >=460MPa, tensile strength 630 ~ 730MPa, and unit elongation >=25%, yield tensile ratio≤0.80, and there is good welds performance, be the steel plate for welded pressure parts.After carrying out cold and hot working, its hardenability is not obvious, not harsh to welding line energy requirement, welding joint mechanical property is good, for maximization and the lightweight of transportable pressure vessel are laid a good foundation, not only be conducive to improve the state of the art of domestic transportable pressure vessel, and can increase substantially delivery efficiency and the economic benefit of China's transportable pressure vessel, and production cost is lower.
Accompanying drawing explanation
Accompanying drawing is metallographic structure figure of the present invention.
Embodiment
By the following specific examples further illustrate the invention:
Table 1 is various embodiments of the present invention and comparative example chemical composition value;
Table 2 is various embodiments of the present invention and the list of comparative example main technologic parameters;
Table 3 is various embodiments of the present invention and the list of comparative example mechanical property;
Table 4 is various embodiments of the present invention and the list of comparative example welding joint mechanical property detected result.
Various embodiments of the present invention are all produced according to following steps:
1) through smelting also continuous casting, become after base, to strand heating, control Heating temperature at 1200～1230 ℃, control heating rate is 8～14min/cm;
2) carry out hot rolling, control start rolling temperature and be not less than 1070 ℃, control last three passage accumulative total drafts and be not less than 30%; Control finishing temperature and be not less than 860 ℃;
3) adopt normalizing process to heat-treat, control normalizing temperature at 870～930 ℃, and insulation, soaking time: 30～40 minutes+thickness of slab * 1 that the millimeter of take is unit minute/mm.
Table 1 various embodiments of the present invention and comparative example chemical composition value (wt, %)
Table 2 various embodiments of the present invention and comparative example main technologic parameters
Table 3 various embodiments of the present invention and the list of comparative example mechanical property
Table 4 various embodiments of the present invention and comparative example welding joint mechanical property
In order to illustrate that this invention steel has good weldability and welding property, steel of the present invention and compared steel have been carried out respectively to welding procedure test.Test conditions: weld heat input 0.5 ~ 30kJ/cm, t
8/5cooling time, scope was at 8 ~ 30s.
From table 3 and table 4, can find out, the present invention is mechanical property yield strength >=460MPa not only, tensile strength 630 ~ 730MPa, and unit elongation >=25%, yield tensile ratio≤0.80, and also property of welded joint is good, has good welding property.
Steel of the present invention can be widely used in the industries such as oil, petrochemical industry, chemical industry and boats and ships, has broad application prospects.
Above-described embodiment only exemplifies for the best, and is not the restriction to embodiments of the present invention.
Claims (2)
1. tensile strength 630MPa level transportable pressure vessel steel, its chemical composition and weight percent are: C:0.15～0.20%, Si:0.15～0.40%, Mn:1.00～1.70%, P≤0.015%, S≤0.006%, Ni:0.10～0.30%, V: 0.02～0.20%, one or more mixing of Cu:0.03～0.30% or Cr0.01～0.10% or Ti:0.008～0.020%, and all the other are for Fe and be inevitably mingled with; Meet: 3Cr+Cu≤7Ti+3V≤3.3C, C+Si/30+Mn/20+Cu/20+Cr/20+Ni/60+V/10≤0.29 simultaneously; Mechanical property: yield strength>=460MPa, tensile strength 630 ~ 730MPa, unit elongation>=25%, yield tensile ratio≤0.80, steel plate is-50 ℃ of KV laterally
2>=150J, welded heat affecting zone-50 ℃ KV
2>=135J, metallographic structure is ferrite+perlite.
2. the production method of steel for the tensile strength 630MPa level transportable pressure vessel described in production claim 1, its step:
1) through smelting also continuous casting, become after base, to strand heating, control Heating temperature at 1200～1230 ℃, control heating rate is 8～14min/cm;
2) carry out hot rolling, control start rolling temperature and be not less than 1070 ℃, control last three passage accumulative total drafts and be not less than 30%; Control finishing temperature and be not less than 860 ℃;
3) adopt normalizing process to heat-treat, control normalizing temperature at 870～930 ℃, and insulation, soaking time: 30～40 minutes+thickness of slab * 1 that the millimeter of take is unit minute/mm.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104726773A (en) * | 2015-04-15 | 2015-06-24 | 武汉钢铁(集团)公司 | Normalizing-type high-strength pressure vessel steel plate with good low-temperature toughness at minus 50DEG C and manufacturing method of normalizing-type high-strength pressure vessel steel plate |
| CN104775073A (en) * | 2015-03-27 | 2015-07-15 | 武汉钢铁(集团)公司 | Normalized steel plate for wind power, and production method thereof |
| CN104831165A (en) * | 2015-04-15 | 2015-08-12 | 武汉钢铁(集团)公司 | Good low-temperature high-toughness normalizing type high-strength pressure container steel plate and manufacturing method thereof |
| CN105369131A (en) * | 2015-11-10 | 2016-03-02 | 湖南华菱湘潭钢铁有限公司 | Production method of Q420R steel of steel board for pressure container |
| CN105586534A (en) * | 2016-02-22 | 2016-05-18 | 山东钢铁股份有限公司 | Ultra-thick hot-rolled H-shaped steel with low ductile-brittle transition temperature and production method thereof |
| CN107746922A (en) * | 2017-10-11 | 2018-03-02 | 舞阳钢铁有限责任公司 | A kind of boiler or pressure vessel 16Mo3 steel plates and its production method |
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| CN102618784A (en) * | 2012-03-22 | 2012-08-01 | 宝山钢铁股份有限公司 | 60kg-level low-cost and high-toughness steel plate and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105586534A (en) * | 2016-02-22 | 2016-05-18 | 山东钢铁股份有限公司 | Ultra-thick hot-rolled H-shaped steel with low ductile-brittle transition temperature and production method thereof |
| CN107746922A (en) * | 2017-10-11 | 2018-03-02 | 舞阳钢铁有限责任公司 | A kind of boiler or pressure vessel 16Mo3 steel plates and its production method |
| CN111187988A (en) * | 2020-02-28 | 2020-05-22 | 鞍钢股份有限公司 | Low-cost high-strength and high-toughness pressure vessel steel plate and production method thereof |
| CN111187988B (en) * | 2020-02-28 | 2021-07-06 | 鞍钢股份有限公司 | Low-cost high-strength and high-toughness pressure vessel steel plate and production method thereof |
| CN111748743A (en) * | 2020-06-30 | 2020-10-09 | 武汉钢铁有限公司 | Corrosion-resistant steel for railway tank wagon and production method thereof |
| CN112342459A (en) * | 2020-09-02 | 2021-02-09 | 包头钢铁（集团）有限责任公司 | Low-temperature-resistant wind power flange steel and rolling method thereof |
| CN112342459B (en) * | 2020-09-02 | 2021-12-21 | 包头钢铁（集团）有限责任公司 | Low-temperature-resistant wind power flange steel and rolling method thereof |
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Effective date of registration: 20170711 Address after: 430083 Qingshan District, Hubei, Wuhan factory before the door No. 2 Patentee after: Wuhan iron and Steel Company Limited Address before: 430080 Wuhan, Hubei Friendship Road, No. 999, Wuchang Patentee before: Wuhan Iron & Steel (Group) Corp. |