CN103695782B - Tensile strength 630MPa level transportable pressure vessel steel and production method thereof - Google Patents
Tensile strength 630MPa level transportable pressure vessel steel and production method thereof Download PDFInfo
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Abstract
Tensile strength 630MPa level transportable pressure vessel steel, its chemical composition wt% is: one or more the mixing of 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%, Cu:0.03 ~ 0.30% or Cr0.01 ~ 0.10% or Ti:0.008 ~ 0.020%.Production stage: continuous casting becomes base post-heating; Hot rolling; Employing normalizing process is heat-treated.The present invention is yield strength >=460MPa not only, tensile strength 630 ~ 730MPa, unit elongation >=25%, yield tensile ratio≤0.80, and has good welds performance.After carrying out cold and hot working, its hardenability is not obvious, and not harsh to welding line energy requirement, welding joint mechanical property is excellent, and for the maximization of transportable pressure vessel and lightweight are laid a good foundation, production cost is lower.
Description
Technical field
The present invention relates to a kind of tensile strength 630MPa level transportable pressure vessel steel and manufacture method thereof, belong to manufacture field of low alloy steel.
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.
Normalizing type steels for pressure vessel use mostly is in the transportable pressure vessel steel of current domestic use, compared 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, the corresponding reduction of ratio of light weight to loading capacity thus improve tank car ratio of light weight to loading capacity and delivery efficiency.The domestic tank body material adopted at present mostly is the steel that tensile strength is less than 610MPa level more, and cause tank body wall thickness comparatively large, the corresponding increasing of ratio of light weight to loading capacity, volume to weight ratio is little, and delivery efficiency is low, the larger gap of existence compared 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 kind of steel is larger than hot-rolled steel, welding cold cracking is more responsive than carbon steel, general steel increase along with the raising welding cold crack sensitivity of intensity rank, and some high-strength steel containing 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, the infusibility such as titanium nitride, titanium carbide particle can be made to dissolve in austenite, the overheated zone grain growth of heat affected zone not only can be made 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 increase, thus make that overheated zone is brittle, aging sensitivity increases, the toughness of welding joint declines.But the welding of steel of the present invention solves the weak area of welding property, the particularly welding joint of different low-alloy normalizing pressure vessel steel.
China Patent Publication No. is the patent documentation of CN1040777C, disclose the chemical composition of the large sphere steel of a kind of yield strength >=460MPa level, manufacture method and performance, its deficiency existed with the addition of the expensive alloying elements such as Cu, Nb, production cost is increased, and its welding property situation not mentioned.
China Patent Publication No. is the patent documentation of CN102719737, discloses a kind of yield strength 460MPa level normalizing high strength steel plate and manufacture method thereof, the actual welding of its this steel not mentioned and welding property, and the microstructure of this steel undeclared.
Chinese Patent Application No. is the patent documentation of CN200710113574.X, discloses a kind of steel plate for low temperature pressure container and production method thereof, and the welding property of this invention steel not mentioned.
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 this invention steel not mentioned.
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 the lower tensile strength 630MPa level transportable pressure vessel steel of production cost and production method thereof.
Realize above-mentioned purpose
Tensile strength 630MPa level transportable pressure vessel steel, its chemical composition and weight percent are: one or more the mixing of 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%, 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 DEG C of KV laterally
2>=150J ,-50 DEG C, welded heat affecting zone KV
2>=135J, metallographic structure is ferrite+perlite.
The production method of production tensile strength 630MPa level transportable pressure vessel steel, its step:
1) after through smelting, also continuous casting becomes base, to strand heating, control Heating temperature at 1200 ~ 1230 DEG C, control heating rate is 8 ~ 14min/cm;
2) carry out hot rolling, control start rolling temperature and be not less than 1070 DEG C, control last three passages and add up draft and be not less than 30%; Control finishing temperature and be not less than 860 DEG C;
3) adopt normalizing process to heat-treat, control normalizing temperature at 870 ~ 930 DEG C, and to be incubated, soaking time: 30 ~ 40 minutes+thickness of slab × 1 in units of millimeter 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 return raising, and two unit elongation notch impact toughness return decline.Carbon content often increases by 0.1%; Tensile strength approximately improves 90MPa, and yield strength approximately improves 40-50MPa.But along with carbon content increases, the unit elongation of steel and impact toughness decreased, especially the amplitude of low-temperature flexibility decline is larger.And, during the welding higher steel of C content, also there will be phenomenon of hardening in welded heat affecting zone, during the welding of Zhejiang furniture, produce the tendency of cold cracking.When in steel, C content is in the scope being not more than 0.18%, the intensity that both can improve steel has applicable production operation, improves its suitability in the industrial production and feasibility.
Si：0.15～0.40%，
Si can reduce the greying tendency of carbon in steel, and improves the intensity of steel with solution strengthening form, but Si goes home, tool magazine element is in the segregation of crystal boundary, therefore its content is unsuitable high, and one side reduces toughness and the weldability of steel.
Mn：1.00～1.70%，
Mn has the intensity improving low-carbon (LC) and middle carbon perlitic steel and acts on significantly.Mn containing 1% about can improve tensile strength 100MPa.In general, Mn content is 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 and promotes the effect of grain growth, to overheated more responsive, therefore Mn content should to be controlled in steel within 1.00-1.70%.
P≤0.015%、S≤0.006%，
Because P, S content in steel must control, in lower scope, to only have smelting Clean Steel, the performance of guarantee steel of the present invention.
Ni：0.10～0.30%，
Ni has certain strengthening effect, and the Ni adding 1% can improve steel strength and be about 20MPa.Ni can also improve the toughness, particularly low-temperature flexibility of steel significantly.Adding Ni in steel, no matter be base material, or the low-temperature flexibility of welded heat affecting zone all significantly improves.But during Ni too high levels, steel-plate iron oxide scale can be caused to be difficult to come off, and steel of the present invention is controlled 0.15 ~ 0.55%.
V：0.02～0.20%，
V is strong carbonitride-forming elements, 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 fining 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 is separated out by the one-tenth point of V and gain in strength.V can make the intensity of steel increase more than 150MPa.But during V too high levels, precipitate quantity increases, and size increases, thus causes the toughness of steel to reduce.The steel control V upper limit of the present invention is 0.20%.
Also containing one or more in Cu, Cr, Ti in the present invention:
Cu mainly plays precipitation strength effect in steel, is conducive in addition obtaining good low-temperature flexibility, increases the fatigue crack extended capability of steel.During too high levels, Plate Welding heat affected zone toughness reduces, and produces check crack in steel plate rolling process, and the present invention controls≤0.30%.
Cr is the element reducing austenitic area, it is medium tenacity carbide forming element, carbide can be formed also can be solid-solution in ferrite in steel, Cr still improves the effective element of steel hardenability simultaneously, when Cu-Cr-Ni compound is added, add Cr and can improve welded steel cool attenuation, in the present invention, the control of Cr is ≤0.10%.
Ti content of the present invention is selected below≤0.020%, and 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 be formed again and is mingled with in steel.Consider from the toughness improving weld metal in low-alloy high-strength steel, add 0.008 ~ 0.020% Ti comparatively suitable, Second Phase Particles TiN, Ti(CN of utilizing Ti to be formed) etc. stop the grain growth of coarse grain zone, welded heat affecting zone, ensure that welding joint has good low-temperature flexibility.
Feature of the present invention is not only yield strength >=460MPa, tensile strength 630 ~ 730MPa, unit elongation >=25%, yield tensile ratio≤0.80, and has good welds performance, is 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 excellent, for the maximization of transportable pressure vessel and lightweight are laid a good foundation, not only be conducive to the state of the art improving 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) after through smelting, also continuous casting becomes base, to strand heating, control Heating temperature at 1200 ~ 1230 DEG C, control heating rate is 8 ~ 14min/cm;
2) carry out hot rolling, control start rolling temperature and be not less than 1070 DEG C, control last three passages and add up draft and be not less than 30%; Control finishing temperature and be not less than 860 DEG C;
3) adopt normalizing process to heat-treat, control normalizing temperature at 870 ~ 930 DEG C, and to be incubated, soaking time: 30 ~ 40 minutes+thickness of slab × 1 in units of millimeter 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, respectively welding procedure test is carried out to steel of the present invention and compared steel.Test conditions: weld heat input 0.5 ~ 30kJ/cm, t
8/5cooling time, scope was at 8 ~ 30s.
As can be seen from table 3 and table 4, the present invention is mechanical property yield strength >=460MPa not only, tensile strength 630 ~ 730MPa, unit elongation >=25%, yield tensile ratio≤0.80, and property of welded joint is good, namely has excellent 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 is only the best and exemplifies, and is not the restriction to embodiments of the present invention.
Claims (1)
1. tensile strength 630MPa level transportable pressure vessel steel, its chemical composition and weight percent are: C:0.16 ~ 0.20%, Si:0.15 ~ 0.28% or 0.34 ~ 0.40%, Mn:1.0 ~ 1.2% or 1.40 ~ 1.70%, P≤0.015%, S≤0.006%, Ni:0.19 ~ 0.30%, V:0.02 ~ 0.14%, Cu:0.03 ~ 0.05% or Cr0.01 ~ 0.10% or Ti:0.008 ~ 0.020% or two or more mixing, 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 DEG C of KV laterally
2>=150J ,-50 DEG C, welded heat affecting zone KV
2>=135J, metallographic structure is ferrite+perlite;
Production stage:
1) after through smelting, also continuous casting becomes base, to strand heating, control Heating temperature at 1200 ~ 1230 DEG C, control heating rate is 8 ~ 14min/cm;
2) carry out hot rolling, control start rolling temperature and be not less than 1070 DEG C, control last three passages and add up draft and be not less than 30%; Control finishing temperature and be not less than 860 DEG C;
3) adopt normalizing process to heat-treat, control normalizing temperature at 870 ~ 930 DEG C, and to be incubated, soaking time: 30 ~ 40 minutes+thickness of slab × 1 in units of millimeter minute/mm.
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| CN104775073B (en) * | 2015-03-27 | 2017-05-24 | 武汉钢铁(集团)公司 | Production method for normalized steel plate for wind power |
| CN104726773B (en) * | 2015-04-15 | 2017-05-17 | 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 |
| CN104831165B (en) * | 2015-04-15 | 2017-08-08 | 武汉钢铁(集团)公司 | With good low-temperature high-toughness normalizing type high-strength pressure vessel steel plate and its manufacture method |
| 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 |
| CN105586534B (en) * | 2016-02-22 | 2017-08-25 | 山东钢铁股份有限公司 | A kind of hot rolled H-shaped and its production method of the thick low ductile-brittle transition temperature of spy |
| 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 |
| 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 |
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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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| JP3399983B2 (en) * | 1992-08-25 | 2003-04-28 | 株式会社神戸製鋼所 | Method for producing high-strength steel sheet with excellent weldability and low yield ratio of 570 N / mm2 or more |
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| CN101871077A (en) * | 2010-06-08 | 2010-10-27 | 武汉钢铁(集团)公司 | Normalizing type high-strength pressure vessel steel and manufacturing 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. |