CN103233160A - Normalizing container steel with 460 MPa-grade yield strength and manufacturing method thereof - Google Patents
Normalizing container steel with 460 MPa-grade yield strength and manufacturing method thereof Download PDFInfo
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- CN103233160A CN103233160A CN201310108383XA CN201310108383A CN103233160A CN 103233160 A CN103233160 A CN 103233160A CN 201310108383X A CN201310108383X A CN 201310108383XA CN 201310108383 A CN201310108383 A CN 201310108383A CN 103233160 A CN103233160 A CN 103233160A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 48
- 239000010959 steel Substances 0.000 title claims abstract description 48
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 238000005096 rolling process Methods 0.000 claims abstract description 14
- 238000001816 cooling Methods 0.000 claims abstract description 13
- 239000000126 substance Substances 0.000 claims abstract description 9
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 12
- 238000002791 soaking Methods 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims description 5
- 238000001953 recrystallisation Methods 0.000 claims description 5
- 229910052717 sulfur Inorganic materials 0.000 claims description 5
- 229910001566 austenite Inorganic materials 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 235000019362 perlite Nutrition 0.000 claims description 2
- 239000010451 perlite Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000003860 storage Methods 0.000 abstract description 2
- 229910001562 pearlite Inorganic materials 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 5
- 238000005728 strengthening Methods 0.000 description 5
- 238000005275 alloying Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 239000004615 ingredient Substances 0.000 description 3
- 229910052758 niobium Inorganic materials 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- IKHGUXGNUITLKF-UHFFFAOYSA-N Acetaldehyde Chemical compound CC=O IKHGUXGNUITLKF-UHFFFAOYSA-N 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- BAVYZALUXZFZLV-UHFFFAOYSA-N Methylamine Chemical compound NC BAVYZALUXZFZLV-UHFFFAOYSA-N 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 2
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 150000003568 thioethers Chemical group 0.000 description 1
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Abstract
The invention provides normalizing container steel with 460 MPa-grade yield strength, which comprises the following chemical components in percentage by weight: 0.10-0.20% of C, 0.30-0.40% of Si, 1.40-1.80% of Mn, less than or equal to 0.015% of P, less than or equal to 0.010% of S, 0.010-0.050% of Nb0.010-0.040% of Al, less than or equal to 0.04% of Ti, and the balance of Fe and inevitable impurities. The steel adopts a production process of controlling rolling, cooling and normalizing in two stages, the microstructure of the prepared steel plate is ferrite plus pearlite, the yield strength is more than or equal to 460MPa, the tensile strength is more than or equal to 570MPa, and the low-temperature toughness meets the condition that the temperature is minus 40 ℃ and more than or equal to 100J. The steel has excellent strength, toughness and comprehensive performance, and can be used for manufacturing spherical gas storage tanks, liquefied gas tank cars and the like.
Description
Technical field
The present invention be more particularly directed to a kind of high strength normalizing container steel, particularly a kind of yield strength is 460MPa level normalizing container steel and manufacture method thereof.
Background technology
The normalizing type steels for pressure vessel use is widely used in fields such as oil, chemical industry, the energy, in order to make various spherical gas storage tanks (as oxygen, nitrogen, ethane, propylene etc.) and Railway Tank Cars for Liquefied Gas (as propane, propylene, dme, liquefied ammonia, methylamine, acetaldehyde etc.).Along with the development of pressurized vessel to maximization and high-parametersization, the design of pressurized vessel, manufacturing and use department are more and more higher to the requirement of steels for pressure vessel use, not only to progressively improve the intensity of steel plate, with reduction container wall thickness or increase volume, but also require to have excellent low-temperature flexibility and welding property.The normalizing type steels for pressure vessel use intensity rank lower (yield strength is below 420MPa) of present China's widespread production and use, limited the development of equipment, be to adapt to the requirement of Economic development, the exploitation of high intensity levels (as yield strength in the 460MPa level) normalizing type container steel is very necessary.
A kind of yield strength that publication number is the CN101413049B patent disclosure can be welded the close grain steel plate for the 420MPa normalizing preparation method.The chemical component weight per-cent of this steel is: C:0.12-0.20%, and Si:0.25-0.65%, Mn:1.20-1.80%, Nb:0.020-0.060%, Ti:0.010-0.030%, V:0.030-0.150, S≤0.010%, P≤0.020%, all the other are Fe.This patent continuously cast bloom insulation 4-5h, soaking time is long, adds higher microalloy elements such as Nb, V, the production cost height, and yield strength is lower than 460MPa.
Publication number has been the CN101871077A patent disclosure a kind of normalizing type high-strength pressure vessel steel and manufacture method thereof.The chemical component weight per-cent of this steel is: C:0.12-0.18%, Si:0.15-0.40%, Mn:1.20-1.70%, P≤0.020%, S≤0.015%, Ni:0.10-0.40%, Nb:0.01-0.03, Als:0.015-0.050%, include a kind of in V≤0.20%, Cu≤0.70 or two kinds simultaneously, all the other are Fe and unavoidable impurities.Added alloying elements such as Ni, Cu in the steel that this patent relates to, cost is higher, and yield strength is lower than 460MPa.
Summary of the invention
The purpose of this invention is to provide a kind of 460 MPa grade yield strength normalizing container steel, design by reasonable component, control the carbon equivalent Ceq=C+Mn/6+(Cr+Mo+V of this steel)/5+(Ni+Cu)/15≤0.46%, adopt controlled rolling and controlled cooling and normalizing process, make its steel plate thickness at 12～30mm, be organized as ferrite and perlite, yield strength 〉=460MPa, tensile strength 〉=570MPa ,-40 ℃ of ballistic work 〉=100J.
For realizing this purpose, the present invention adopts following technical scheme:
Described steel chemical ingredients by weight percentage is as follows: C0.10～0.20%, Si0.30～0.40%, Mn1.40～1.80%, P≤0.015%, S≤0.010%, Nb0.010～0.050%, Al0.010～0.040%, 0.04≤Ti≤0.10%, all the other are Fe and unavoidable impurities.
Below to the selection concrete analysis explanation of the effect of the contained alloying element of the present invention and consumption thereof:
C:C improves matrix strength by solution strengthening, and forms cementite improve intensity in steel, but the C too high levels can have a negative impact to toughness and plasticity, and the best C content that the present invention sets is 0.10～0.20%.
Si:Si mainly plays desoxydatoin, and improves the intensity of steel with the solution strengthening form, and too high levels can cause toughness to descend, so Si content of the present invention control is 0.30～0.40%.
Mn:Mn plays the solution strengthening effect, improves pearlitic intensity, and improves hot workability, also be the effective element that prevents thermal crack simultaneously, can improve the distribution of sulphide form, but the easy segregation of too much Mn, worsen the performance of steel, Mn content control of the present invention is 1.40～1.80%.
Nb:Nb can improve austenite recrystallization and stop temperature, easily is combined with C, N simultaneously and generates the effect that the carbonitride precipitated phase produces crystal grain thinning and precipitation strength, improves toughness.But the increase of strengthening effect is not obvious when Nb content surpasses 0.050%, and can influence the welding property of steel, and the present invention controls Nb content 0.010～0.050%.
Ti:Ti can be combined with C, N and be formed tiny carbide, nitride, stops austenite crystal to be grown up, and thinning microstructure improves intensity, for guaranteeing intensity Ti 〉=0.04 of steel.But the Ti too high levels, strengthening effect weakens, and may cause the toughness of steel to reduce, and among the present invention the content of Ti is controlled≤0.10%.
Al:Al is deoxidant element, and the AlN that forms with N chemical combination is crystal grain thinning effectively, and according to production experience, the control of Al content is comparatively suitable 0.010%～0.040%.
Impurity content in the steel is more few more good, and P, S are the elements harmful to toughness, and in order to obtain good low-temperature flexibility, steel control P content of the present invention is no more than 0.015%, S content and is no more than 0.010% and is advisable.
Another object of the present invention provides the manufacture method that a kind of yield strength is 460MPa level normalizing container steel, comprises the steps:
1) in the controlled rolling operation, slab heating temperature is 1150～1250 ℃, and soaking time is 1.5～2.5h; The rolling start rolling temperature in austenite recrystallization district is 980～1150 ℃, and the rolling start rolling temperature in non-recrystallization district is 880～950 ℃, and finishing temperature is 850～900 ℃;
2) in the control refrigerating work procedure, adopt water cooling system, rate of cooling is 8～15 ℃/s, and final cooling temperature is 500～700 ℃, and air cooling is to room temperature afterwards;
3) in the normalizing operation, normalizing temperature is 860～930 ℃, and soaking time is 10～60min.
Compared with prior art, beneficial effect of the present invention is at least:
1) the present invention has improved the intensity of traditional normalized steel, and yield strength reaches more than the 460MPa, and tensile strength reaches more than the 570MPa, and has good toughness;
2) composition is simple, and the alloying element addition is lower, and production cost is lower;
3) adopt rational controlled rolling and controlled cooling to add normalizing process, production technique is simple, steel plate homogeneous microstructure, excellent performance.
Description of drawings
The microstructure picture of Fig. 1 embodiment 1 light plate vertical section.
Embodiment
The present invention will be further described in detail below in conjunction with specific embodiment.
Embodiment 1 and 2 chemical ingredients see Table 1, the hot rolling and the heat treatment process parameter that adopt are: 1150～1250 ℃ of Heating temperatures, be incubated 1.5～2.5 hours, 980～1150 ℃ of start rolling temperatures, 850～900 ℃ of finishing temperatures, 8～15 ℃/s of cooling rate, 500～700 ℃ of final cooling temperatures, the Finished Steel plate thickness is respectively 18mm and 15mm, 860～930 ℃ of normalizing temperatures, soaking time 10～60min.
Embodiment 1 and 2 steel plate thickness, mechanical property see Table 2.
The chemical ingredients (wt%) of the normalizing container steel that table 1 embodiment of the invention 1 and 2 relates to
| ? | C | Si | Mn | P | S | Nb | Ti | Als | Ceq |
| Embodiment 1 | 0.17 | 0.36 | 1.51 | 0.0088 | 0.0061 | 0.021 | 0.043 | 0.015 | 0.419 |
| Embodiment 2 | 0.19 | 0.35 | 1.60 | 0.0075 | 0.0044 | 0.016 | 0.080 | 0.030 | 0.457 |
The normalizing container steel that table 2 embodiment of the invention 1 and 2 relates to mechanical property
As above for those skilled in the art, can easily realize other modification although embodiment of the present invention are open, therefore not deviate under the universal that claim and equivalency range limit that the present invention is not limited to specific details.
Claims (6)
1. 460 MPa grade yield strength normalizing container steel, it is characterized in that: the chemical component weight per-cent of described steel is: C0.10～0.20%, Si0.30～0.40%, Mn1.40～1.80%, P≤0.015%, S≤0.010%, Nb0.010～0.050%, Al0.010～0.040%, 0.04≤Ti≤0.10%, all the other are Fe and unavoidable impurities.
2. 460 MPa grade yield strength normalizing container steel according to claim 1 is characterized in that: the carbon equivalent of this steel≤0.46%, described carbon equivalent Ceq=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15.
3. 460 MPa grade yield strength normalizing container steel according to claim 1, it is characterized in that: the microstructure of steel plate is ferrite and perlite.
4. 460 MPa grade yield strength normalizing container steel according to claim 1, it is characterized in that: the finished product thickness of described steel is 12～30mm.
5. 460 MPa grade yield strength normalizing container steel according to claim 1 is characterized in that: the yield strength 〉=460MPa of described steel, tensile strength 〉=570MPa ,-40 ℃ of transverse impact merit 〉=100J.
6. the manufacture method of a 460 MPa grade yield strength normalizing container steel is characterized in that described manufacture method comprises the steps:
1) in the controlled rolling operation, slab heating temperature is 1150～1250 ℃, and soaking time is 1.5～2.5h; The rolling start rolling temperature in austenite recrystallization district is 980～1150 ℃, and the rolling start rolling temperature in non-recrystallization district is 880～950 ℃, and finishing temperature is 850～900 ℃;
2) in the control refrigerating work procedure, adopt water cooling system, rate of cooling is 8～15 ℃/s, and final cooling temperature is 500～700 ℃, and air cooling is to room temperature afterwards;
3) in the normalizing operation, normalizing temperature is 860～930 ℃, soaking time 10～60min.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104480393A (en) * | 2014-11-26 | 2015-04-01 | 舞阳钢铁有限责任公司 | TC128GrB steel plate for oil bath tank truck and production method of TC128GrB steel plate |
| CN105112780A (en) * | 2015-09-02 | 2015-12-02 | 山东钢铁股份有限公司 | Low-carbon-equivalent-coefficient steel plate for large-thickness pressure-bearing equipment, and production method |
| CN105648313A (en) * | 2016-01-18 | 2016-06-08 | 内蒙古包钢钢联股份有限公司 | Rare earth treated normalized Q460GJ steel plate for buildings and production method of steel plate |
| CN106148804A (en) * | 2016-08-31 | 2016-11-23 | 广西盛隆冶金有限公司 | Corrosion-resistant nickel chromium triangle steel plate and manufacture method thereof |
| CN106544581A (en) * | 2016-09-30 | 2017-03-29 | 秦皇岛首秦金属材料有限公司 | A kind of high-strength container steel of normalizing state nickel-vanadium alloy and its production method |
| CN107287530A (en) * | 2016-03-31 | 2017-10-24 | 鞍钢股份有限公司 | High-strength high-toughness non-quenched and tempered steel for low-temperature pressure vessel and manufacturing method thereof |
| CN112063930A (en) * | 2020-09-21 | 2020-12-11 | 新余钢铁股份有限公司 | Rare earth treated low-cost high-toughness low-temperature pressure vessel steel plate and production method thereof |
| CN112458365A (en) * | 2020-11-06 | 2021-03-09 | 新余钢铁股份有限公司 | Vanadium-free normalized high-toughness thick ship plate with thickness of more than or equal to 60mm and production method thereof |
| CN112813353A (en) * | 2021-01-29 | 2021-05-18 | 五矿营口中板有限责任公司 | Steel for ultra-high temperature SPWHT high-toughness normalizing container and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104480393A (en) * | 2014-11-26 | 2015-04-01 | 舞阳钢铁有限责任公司 | TC128GrB steel plate for oil bath tank truck and production method of TC128GrB steel plate |
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| CN105648313A (en) * | 2016-01-18 | 2016-06-08 | 内蒙古包钢钢联股份有限公司 | Rare earth treated normalized Q460GJ steel plate for buildings and production method of steel plate |
| CN107287530A (en) * | 2016-03-31 | 2017-10-24 | 鞍钢股份有限公司 | High-strength high-toughness non-quenched and tempered steel for low-temperature pressure vessel and manufacturing method thereof |
| CN107287530B (en) * | 2016-03-31 | 2019-03-26 | 鞍钢股份有限公司 | High-strength high-toughness non-quenched and tempered steel for low-temperature pressure vessel and manufacturing method thereof |
| CN106148804A (en) * | 2016-08-31 | 2016-11-23 | 广西盛隆冶金有限公司 | Corrosion-resistant nickel chromium triangle steel plate and manufacture method thereof |
| CN106544581A (en) * | 2016-09-30 | 2017-03-29 | 秦皇岛首秦金属材料有限公司 | A kind of high-strength container steel of normalizing state nickel-vanadium alloy and its production method |
| CN112063930A (en) * | 2020-09-21 | 2020-12-11 | 新余钢铁股份有限公司 | Rare earth treated low-cost high-toughness low-temperature pressure vessel steel plate and production method thereof |
| CN112458365A (en) * | 2020-11-06 | 2021-03-09 | 新余钢铁股份有限公司 | Vanadium-free normalized high-toughness thick ship plate with thickness of more than or equal to 60mm and production method thereof |
| CN112813353A (en) * | 2021-01-29 | 2021-05-18 | 五矿营口中板有限责任公司 | Steel for ultra-high temperature SPWHT high-toughness normalizing container and manufacturing method thereof |
| CN114318159A (en) * | 2021-12-02 | 2022-04-12 | 首钢集团有限公司 | 345 MPa-grade container steel plate with hydrogen induced cracking resistance and preparation method thereof |
| CN114318159B (en) * | 2021-12-02 | 2022-12-16 | 首钢集团有限公司 | 345 MPa-grade container steel plate with hydrogen induced cracking resistance and preparation method thereof |
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