CN107177786B - A kind of design and its manufacturing method of the high manganese cut deal of LNG storage tank - Google Patents
A kind of design and its manufacturing method of the high manganese cut deal of LNG storage tank Download PDFInfo
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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- 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
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Abstract
本发明涉及一种LNG储罐用高锰中厚板的设计及其制造方法，属于钢铁材料领域。该高锰中厚板的化学成分按重量百分比为：C 0.45～0.67％，Si 0.02～0.48％，Mn 23.70～27.20％，P≤0.051％，S≤0.02％，Ni 0.00～2.20％，Cr 0.00～4.13％，Cu 0.00～1.10％，Mo 0.00～0.94％，V 0.00～0.21％，Al 0.00～4.64％，余量为Fe和不可避免的杂质。该高锰中厚板的制造方法包括：冶炼、浇注、锻造、轧制。本发明的产品获得了单相奥氏体组织，实验钢具有高强塑性，同时获得优异的‑196℃超低温冲击韧性，具备了替代9％Ni钢的潜力，且成本远低于9％Ni钢。
The invention relates to a design and a manufacturing method of a high-manganese medium-thick plate for LNG storage tanks, belonging to the field of iron and steel materials. The chemical composition of the high manganese plate is: C 0.45-0.67%, Si 0.02-0.48%, Mn 23.70-27.20%, P≤0.051%, S≤0.02%, Ni 0.00-2.20%, Cr 0.00 ~4.13%, Cu 0.00~1.10%, Mo 0.00~0.94%, V 0.00~0.21%, Al 0.00~4.64%, the balance is Fe and unavoidable impurities. The manufacturing method of the high manganese plate includes smelting, pouring, forging and rolling. The product of the present invention obtains a single-phase austenite structure, and the experimental steel has high strength and plasticity, and at the same time obtains excellent -196°C ultra-low temperature impact toughness, has the potential to replace 9% Ni steel, and the cost is much lower than 9% Ni steel.
Description
Technical field
The present invention relates to a kind of LNG storage tank designs and its manufacturing method of high manganese cut deal, belong to field of iron and steel.
Background technique
In recent years, LNG (liquefied natural gas, Liquefied Natural Gas) is as a kind of high-quality and efficient cleaning energy
Source is at home and abroad more and more paid attention to, and market is had been equipped with.LNG as it is universally acknowledged it is most clean not
Renewable energy, China production like a single spark can start a prairie fire, quickly stepping into " gold period " of scale, industrialization.Mesh
Before, the whole world shares 12 countries (about 68 production lines) production LNG, and production capacity reaches 1.38 hundred million tons/year, and the product of LNG is
It is widely used in the fields such as power generation, industrial chemicals, new automobile fuel, domestic fuel.
The 25% of non-renewable energy composition will be accounted for by expecting the year two thousand twenty natural gas, and second is occupied more than coal；The year two thousand forty is super
Petroleum and occupy first.Ratio of the China's natural gas in Energy Mix reaches 6% in 2010, and the year two thousand twenty reaches 12%.As it can be seen that
The demand of LNG is growing day by day, quickly grows.
LNG is exactly to handle mined natural gas by deep purifying, then use advanced refrigeration process technology,
It is set to be converted into liquid under -162 DEG C of normal pressure of cryogenic conditions, 625 times of volume-diminished, in order to carry out the pipeline of long range and remote
Ocean transport.The combustibility of LNG and ultralow warm nature propose extremely harsh requirement to the performance of its structural material.For a long time,
LNG storage tank material mostly uses aluminium alloy, austenitic stainless steel, 9Ni steel, invar steel etc..But there are at high cost, welding for these materials
Difficult, the problems such as design strength is low, it is badly in need of developing novel LNG storage tank material.
In the exploitation of novel super-low adiabator, high Mn austenitic steel is tired due to its price, low thermal coefficient of expansion and low week
The significant advantage of labor performance and be concerned.High Mn austenitic steel uses Mn and C stable austenite phase, obtains at room temperature
Single phase austenite tissue, and austenitic steel is generally not present ductile-brittle transiton phenomenon, thus high Mn austenitic steel have ultralow temperature (-
196 DEG C) application innate advantage.
High Mn austenitic steel is fully austenitic structure, and there is the low universal phenomena of yield strength, generally low compared with 9Ni steel
150MPa or so.Although apparent ductile-brittle transiton phenomenon, the Mn segregation and carbide of grain boundaries is not present in high Mn austenitic steel
It is precipitated and weakens grain-boundary strength significantly, lead to intergranular crack, significantly reduce the ultralow temperature impact absorbing energy at -196 DEG C.
Summary of the invention
It is designed based on alloy design and processes, the purpose of the present invention is to provide a kind of high manganese cut deals of LNG storage tank
Design and its manufacturing method, high manganese cut deal have high-strength plasticity and -196 DEG C of excellent ultralow temperature impact flexibility, cost remote
Lower than traditional LNG storage tank steel.
The technical scheme is that
A kind of high manganese cut deal of LNG storage tank, the chemical component of the high manganese cut deal is by weight percentage are as follows: and C 0.45~
0.67%, Si 0.02~0.48%, Mn 23.70~27.20%, P≤0.051%, S≤0.02%, Ni 0.00~
2.20%, Cr 0.00~4.13%, Cu 0.00~1.10%, Mo 0.00~0.94%, V 0.00~0.21%, Al 0.00
~4.64%, surplus is Fe and inevitable impurity.
The high manganese cut deal of the LNG storage tank, the tissue of high manganese cut deal are isometric or hardening austenite structure.
The LNG storage tank preparation method of high manganese cut deal, includes the following steps:
(1) it smelts: using vacuum induction melting；
(2) it casts: being poured into Copper casting mould after melting, obtain ingot casting；
(3) it forges: cutting riser, after ingot casting is heated to 1100~1300 DEG C of 1~3h of heat preservation, be forged to steel billet；
(4) it is rolled using stage controlled rolling or two-stage control.
The preparation method of the high manganese cut deal of the LNG storage tank, when using a stage controlled rolling: start rolling temperature for
1083~1185 DEG C, finishing temperature is 990~1116 DEG C, and opening cold temperature is 935~1080 DEG C.
The preparation method of the high manganese cut deal of the LNG storage tank, LNG storage tank are with the yield strength of high manganese cut deal
340~460MPa, tensile strength are 790~1022MPa, and elongation after fracture is 42~70%, and yield tensile ratio is 0.37~0.56 ,-
196 DEG C of impact absorbing energies are 61~170J.
The preparation method of the high manganese cut deal of the LNG storage tank, when being rolled using two-stage control: stage open rolling temperature
Degree is 1155~1170 DEG C, and a stage finishing temperature is 1090~1113 DEG C；Two-stage rolling temperature is 931~962 DEG C, second order
Section finishing temperature is 900~934 DEG C, and opening cold temperature is 860~895 DEG C.
The preparation method of the high manganese cut deal of the LNG storage tank, LNG storage tank are with the yield strength of high manganese cut deal
540~615MPa, tensile strength are 900~970MPa, and elongation after fracture is 35~52%, and yield tensile ratio is 0.59~0.68 ,-
196 DEG C of impact absorbing energies are 60~103J.
LNG storage tank of the present invention is as follows with the effect of high manganese cut deal chemical component (wt%):
C: austenite former and solution strengthening element, C content of the invention control between 0.45%~0.67%.
Si: ferrite former has the function of solution strengthening, delay Carbide Precipitation, improves anti-temper brittleness, but
Low-temperature flexibility, the plasticity of steel can also be reduced simultaneously, easily Laves phase is promoted to be precipitated, Si content control of the invention 0.02%~
Between 0.48%, preferably 0.05~0.20%.
Mn: typical austenite former, stable austenite ability are only second to Ni, and price is only 1/10~1/5, the Mn of Ni
Easy segregation causes intergranular crack in crystal boundary, and in order to obtain fully austenitic structure at room temperature, Mn content control of the invention exists
Between 23.70%~27.20%.
P, it S: for inevitable harmful element, reduces as far as possible.
Ni: non-carbide forming element, typical austenite former improve corrosion resistance, improve low-temperature flexibility, but
Expensive, Ni content of the invention controls between 0.00%~2.20%, and preferably 1.00~2.20%.
Cr: typical ferrite former improves corrosion resistance, Cr content control of the invention 0.00%~
Between 4.13%, preferably 3.0~4.1%.
Cu: non-carbide forming element, austenite former improve corrosion resistance of steel energy, Cu content of the invention
Control is between 0.00~1.10%, and preferably 0.5~1.1%.
Mo: ferrite and carbide have certain inhibition intergranular crack effect, Mo content control of the invention
System is between 0.00%~0.94%, and preferably 0.4~0.94%.
V: carbide plays precipitation enhancement, V content control of the invention 0.00%~0.21% it
Between, preferably 0.1~0.21%.
Al: ferrite former improves the stacking fault energy of austenite, Al content control of the invention 0.00%~
Between 4.64%, preferably 2.0~4.6%.
The invention has the advantages and beneficial effects that:
1, product of the invention obtains single phase austenite tissue, and experiment steel has high-strength plasticity, at the same obtain it is excellent-
196 DEG C of ultralow temperature impact flexibility have the potentiality of substitution 9%Ni steel, and cost is far below 9%Ni steel.
2, product elongation percentage of the invention can reach 35% or more, have excellent plasticity.
3, product of the invention has more preferably Anti-temperature difference deformation performance and antifatigue cracking performance relative to 9Ni steel.
Detailed description of the invention
Fig. 1 is that the IPF of stage controlled rolling schemes, and is organized as isometric austenite.
Fig. 2 is the IPF figure of two-stage control rolling, is organized to harden austenite.
Specific embodiment
In the specific implementation process, it smelts and uses vacuum induction melting, the copper that diameter is about 100mm is poured into after melting
In mold, cuts shrinkage cavity and obtain ingot casting；Riser is cut, after ingot casting is heated to 1200 DEG C of heat preservation 2h, being forged to section is 80mm
× 80mm steel billet.Steel billet is reheated to 1200 DEG C and keeps the temperature 2h, carries out one on 450mm two-roller reversible hot rolling experimental mill
Stage or two-phase control rolling.The controlled rolling of one stage, start rolling temperature are 1083~1185 DEG C, and finishing temperature is 990~1116 DEG C,
Opening cold temperature is 935~1080 DEG C；Two-stage control rolling, a stage start rolling temperature are 1155~1170 DEG C, stage finish to gauge
Temperature is 1090~1113 DEG C, and two-stage rolling temperature is 931~962 DEG C, and two-stage finishing temperature is 900~934 DEG C, is opened cold
Temperature is 860~895 DEG C.
The chemical component of 1 sample of table, wt%
One stage rolling mill practice is as follows:
| Number | Start rolling temperature, DEG C | Finishing temperature, DEG C | Cold temperature is opened, DEG C |
| 1# steel | 1170 | 1060 | 1020 |
| 2# steel | 1159 | 1050 | 1015 |
| 3# steel | 1155 | 1045 | 1000 |
| 4# steel | 1167 | 1055 | 1015 |
| 5# steel | 1114 | 1000 | 950 |
| 6# steel | 1083 | 990 | 935 |
| 7# steel | 1120 | 1010 | 955 |
| 8# steel -1 | 1170 | 1105 | 1068 |
| 8# steel -2 | 1160 | 1020 | 980 |
| 9# steel | 1145 | 1025 | 985 |
| 10# steel -1 | 1185 | 1116 | 1080 |
| 10# steel -2 | 1160 | 1027 | 988 |
| 11# steel | 1150 | 1017 | 970 |
| 12# steel -1 | 1165 | 1100 | 1070 |
| 12# steel -2 | 1145 | 1000 | 960 |
As shown in Figure 1, from the IPF of stage controlled rolling figure as can be seen that tissue is isometric austenite.
Room temperature tensile properties and -196 DEG C of impact properties are as follows:
Note: YS- yield strength, TS- tensile strength, TEL- elongation after fracture, YR- yield tensile ratio.
Two-phase control rolling technique is as follows:
As shown in Fig. 2, the IPF figure rolled from two-stage control is as can be seen that tissue is hardening austenite.
Room temperature tensile properties and -196 DEG C of impact properties are as follows:
| Number | YS, MPa | TS, MPa | TEL, % | YR | - 196 DEG C of impact absorbing energies, J |
| 8# steel | 600 | 920 | 49 | 0.65 | 60 |
| 9# steel | 600 | 950 | 49 | 0.63 | 78 |
| 10# steel | 615 | 970 | 48 | 0.63 | 60 |
| 11# steel | 610 | 900 | 35 | 0.68 | 80 |
| 12# steel | 540 | 915 | 52 | 0.59 | 103 |
Note: YS- yield strength, TS- tensile strength, TEL- elongation after fracture, YR- yield tensile ratio.
Embodiment the result shows that, the high manganese cut deal of the present invention is using high temperature one stage controlled rolling and rolls at rear press quenching
Reason can get -196 DEG C of excellent ultralow temperature impact flexibility, and being rolled using two-stage control and roll rear press quenching processing can be significant
Improve yield strength.
Claims (6)
1. a kind of high manganese cut deal of LNG storage tank, which is characterized in that the chemical component of the high manganese cut deal is by weight percentage
Are as follows: C 0.45~0.67%, Si 0.19~0.48%, Mn 23.70~27.20%, P≤0.051%, S≤0.02%, Ni
0.00~2.20%, Cr 3.0~4.1%, Cu 0.00~1.10%, Mo 0.00~0.94%, V 0.00~0.21%, Al
2.0~4.6%, surplus is Fe and inevitable impurity；
The LNG storage tank preparation method of high manganese cut deal, includes the following steps:
(1) it smelts: using vacuum induction melting；
(2) it casts: being poured into Copper casting mould after melting, obtain ingot casting；
(3) it forges: cutting riser, after ingot casting is heated to 1100~1300 DEG C of 1~3h of heat preservation, be forged to steel billet；
(4) it is rolled using stage controlled rolling or two-stage control.
2. the high manganese cut deal of LNG storage tank according to claim 1, which is characterized in that the tissue of high manganese cut deal be etc.
Axis or hardening austenite structure.
3. the high manganese cut deal of LNG storage tank described in accordance with the claim 1, which is characterized in that when using a stage controlled rolling:
Start rolling temperature is 1083~1185 DEG C, and finishing temperature is 990~1116 DEG C, and opening cold temperature is 935~1080 DEG C.
4. the high manganese cut deal of LNG storage tank described in accordance with the claim 3, which is characterized in that the high manganese cut deal of LNG storage tank
Yield strength is 340~460MPa, and tensile strength is 790~1022MPa, and elongation after fracture is 42~70%, and yield tensile ratio is
0.37~0.56, -196 DEG C of impact absorbing energies are 61~170J.
5. the high manganese cut deal of LNG storage tank described in accordance with the claim 1, which is characterized in that when using two-stage control rolling:
One stage start rolling temperature is 1155~1170 DEG C, and a stage finishing temperature is 1090~1113 DEG C；Two-stage rolling temperature is 931
~962 DEG C, two-stage finishing temperature is 900~934 DEG C, and opening cold temperature is 860~895 DEG C.
6. the high manganese cut deal of LNG storage tank according to claim 5, which is characterized in that the high manganese cut deal of LNG storage tank
Yield strength is 540~615MPa, and tensile strength is 900~970MPa, and elongation after fracture is 35~52%, yield tensile ratio 0.59
~0.68, -196 DEG C of impact absorbing energies are 60~103J.
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| CN107523748A (en) * | 2017-09-22 | 2017-12-29 | 河钢股份有限公司 | Ultra-low temperature surroundings high manganese steel sheet and its production method |
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Application publication date: 20170919 Assignee: Xiangtan Iron & Steel Co.,Ltd. Of Hunan Hualing Valin Assignor: Northeastern University Contract record no.: X2022210000001 Denomination of invention: Design and manufacturing method of high manganese medium thick plate for LNG storage tank Granted publication date: 20181221 License type: Common License Record date: 20220106 |