CN107805754A - A kind of low-temperature pressure container forging and preparation method thereof - Google Patents
A kind of low-temperature pressure container forging and preparation method thereof Download PDFInfo
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- CN107805754A CN107805754A CN201610815318.4A CN201610815318A CN107805754A CN 107805754 A CN107805754 A CN 107805754A CN 201610815318 A CN201610815318 A CN 201610815318A CN 107805754 A CN107805754 A CN 107805754A
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- forging
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
Abstract
The invention provides a kind of low-temperature pressure container forging and preparation method thereof, and on the basis of the weight of the forging, the forging contains the following chemical composition of percentage：C：0.09~0.16%, Si：0.15~0.50%, Mn：0.85~1.70%, S：≤ 0.010%, P：≤ 0.020%, Ni：0.30~0.86%, Nb：≤ 0.05%, Cu：≤ 0.30%, V：≤ 0.05%, Als：0.015~0.080%, remaining is Fe and inevitable impurity, wherein, the content of each component is not 0；Impact absorbing energy KV2 >=52J of the forging at 60 DEG C.The low-temperature pressure container is good with forging resistance to low temperature：There is higher toughness and intensity in 60 DEG C of temperatures above.
Description
Technical field
The present invention relates to the pressure vessel field of the applications such as petrochemical industry, coal chemical industry, and in particular to a kind of low-temperature pressure holds
Device forging and preparation method thereof.
Background technology
As the country is increasing to the demand of clean energy resource, the device of oil refining, chemical industry, coal chemical industry, coal gas and LNG
Largely start.In these devices, pressure vessel, heat exchanger and pressure pipeline account for more than the 60% of total equipment investment, therefore, above-mentioned
Each part prepares basic demand of the material except meeting its application, it should also be taken into account that its economy.In addition, such device is general
A feature all be present：Worst cold case.In order to tackle this environment, developed both at home and abroad -40 DEG C, -45 DEG C, -50 DEG C, -
The low temperature low-alloy forging of 70 DEG C, -100 DEG C ranks, but lack the forging of -60 DEG C of ranks only, this is to engineering design, system
Make, purchase and construction is made troubles.There are problems that excessively using sometimes, as -60 DEG C of ranks can be selected originally, but must not
- 70 DEG C of ranks are not selected, cause unnecessary waste.
Ni systems steel is the forging material that current this area is widely used in low temperature, and this forging material is carried by adding Ni
High/low temperature toughness, but it still suffers from the problems such as low temperature intensity is low, and toughness and plasticity can not get both, expensive.Therefore, it is necessary to
Develop a kind of low temperature forging based on Ni systems steel.
The content of the invention
In order to solve the above-mentioned problems in the prior art, the invention provides a kind of low-temperature pressure container forging and
Its preparation method.The resistance to low temperature of the low-temperature pressure container forging is good：Have in -60 DEG C of temperatures above higher tough
Property and intensity.
According to the first aspect of the invention, the invention provides a kind of low-temperature pressure container forging, with the weight of the forging
On the basis of amount, the forging contains the following chemical composition of percentage：C：0.09~0.16%, Si：0.15~
0.50%, Mn：0.85~1.70%, S：≤ 0.010%, P：≤ 0.020%, Ni：0.30~0.86%, Nb：≤ 0.05%,
Cu：≤ 0.30%, V：≤ 0.05%, Als：0.015~0.080%, remaining is Fe and inevitable impurity, wherein, each group
The content divided is not 0；Impact absorbing energy KV2 >=52J of the forging at -60 DEG C.
According to the second aspect of the invention, the invention provides a kind of preparation side of the low-temperature pressure container forging
Method, this method comprise the following steps：
1) refining of steel：Raw material is smelted, then carries out external refining and application of vacuum successively；
2) forging is molded：By continuous casting or molding manufacture steel billet, then using forcing press forging molding；
3) it is heat-treated：The condition of delivery for being molded forging is quenching+tempering.
The room-temperature mechanical property of the low-temperature pressure container forging of the present invention includes：As thickness≤200mm of forging, institute
Yield strength >=400MPa of forging is stated, tensile strength is 520~610MPa, Longitudinal extending rate A50mm>=32%；When forging
200mm ＜ thickness≤300mm, yield strength >=390MPa of the forging, tensile strength are 500~600MPa, Longitudinal extending
Rate A50mm>=28%.Impact absorbing energy KV2 >=52J of the forging at -60 DEG C.The low-temperature pressure container forging of the present invention
Part has higher toughness and intensity in -60 DEG C of temperatures above.
Embodiment
To make the present invention easier to understand, the present invention is described in detail below in conjunction with embodiment, these embodiments are only
Serve illustrative, be not intended to limit the invention.
According to the first aspect of the invention, the invention provides a kind of low-temperature pressure container forging, with the weight of the forging
On the basis of amount, the forging contains the following chemical composition of percentage：C：0.09~0.16%, Si：0.15~
0.50%, Mn：0.85~1.70%, S：≤ 0.010%, P：≤ 0.020%, Ni：0.30~0.86%, Nb：≤ 0.05%,
Cu：≤ 0.30%, V：≤ 0.05%, Als：0.015~0.080%, remaining is Fe and inevitable impurity, wherein, each group
The content divided is not 0；Impact absorbing energy KV2 >=52J of the forging at -60 DEG C.
Preferably, low-temperature pressure container forging of the invention, on the basis of the weight of the forging, the forging contain by
The following chemical composition of percent by weight：C：0.10~0.15%, Si：0.15~0.45%, Mn：1.05~1.58%, S：
≤ 0.009%, P：≤ 0.016%, Ni：0.42~0.76%, Nb：≤ 0.04%, Cu：≤ 0.28%, V：≤ 0.03%, Als：
0.018~0.065%, remaining is Fe and inevitable impurity, wherein, the content of each component is not 0；The forging-
Impact absorbing energy KV2 >=60J at 60 DEG C.
According to the present invention, the effect of main chemical compositions is as follows in the low-temperature pressure container forging：
C：Carbon can be dissolved by gap and improve hardness of steel, be the maximally effective element of reinforced structure steel, and be also most to pass through
The element of Ji, but carbon has detrimental effect to toughness, plasticity, weldability etc., therefore the obdurability based on steel, weldability etc. are each
The matching of performance, C of the invention content are controlled between 0.09wt%~0.16wt%, and preferably C content is 0.10wt%
~0.15wt%.
Si：Silicon plays deoxidation in steel, also there is certain solid solution strengthening effect, silicon in addition to it can suppress manganese segregation,
The Grain Boundary Segregation of phosphorus can also be suppressed, but silicone content is too high in steel steel fragility is occurred, in order to ensure toughness, Si of the invention
Content control between 0.15wt%~0.50wt%, preferably Si content is 0.15wt%~0.45wt%.
Mn：Manganese is among the austenite stabilizing elements, while is also matrix strengthening element, can be improved by precipitation strength strong
Degree, manganese can also improve the quenching degree of material, too low, and intensity does not reach requirement, the too high toughness for then influenceing material, and silicon
It is present in certain proportion in steel with manganese, also helps suppression segregation each other, therefore, Mn content is controlled in 0.85wt%
In the range of~1.70wt%, preferably Mn content is 1.05wt%~1.58wt%.
S、P：Belong to impurity element in steel, content should be reduced as far as possible.Sulphur easily forms precipitate sulphur with metallic element manganese
Change manganese, reduce low-temperature flexibility, S content is controlled in below 0.010wt%, preferably S content≤0.009wt%；Phosphorus easily exists
Grain Boundary Segregation, crystal boundary resistance to crack extension ability is reduced, reduce low-temperature flexibility, it is excellent by the control of P content in below 0.020wt%
Select P content≤0.016wt%.
Ni：Nickel is non-carbide former, the effect of solution strengthening is primarily served in steel, especially to material low
Stability under temperature is most important, is reduction ductile-brittle transition temperature element best in metallic element, is advantageous to improve material
Quenching degree and intensity, while the cold plasticity of material can also be improved, for economics, it is by Ni content control
0.30wt%~0.86wt%, preferably Ni content are 0.42wt%~0.76wt%.
Nb：The carboritride strain induced precipitate of niobium plays precipitation enhancement, while prevents brilliant in hot procedure
Grain is grown up.If its content is higher, continuous casting steel billet easily splits, and influences the lumber recovery of forging, present invention control Nb content≤
0.05wt%, preferably Nb content≤0.04wt%.
Cu：Copper with stable austenite, can significantly improve the activity of carbon, promote the precipitation of alloy carbide, so as to
The effect of refinement transformation tissue and precipitation strength is waved in sending and receiving, by the control of Cu content in the range of≤0.30wt%, preferably Cu
Content≤0.28wt%.
V：Vanadium dramatically increases the reheat cracking susceptibility of forging, while the reciprocation between the niobium in steel, plays niobium vanadium
The effect of complex intensifying, so as to compensate for the decline situation of the forging intensity caused by carbon content decline in steel, limit containing for V
Content≤0.03wt% of amount≤0.05wt%, preferably V.
Als：Dissolved aluminum has the function that crystal grain thinning, in order to reduce the oxygen content in steel in steel-smelting production process, commonly uses
The deoxidation materials such as aluminium, barium, calcium, silicon, manganese (or its composite alloy) react into oxide clinker with oxygen and float to molten steel upper strata
And the oxygen content in steel is reduced, wherein aluminium is excellent deoxidier, and aluminium easily reacts generation Al with oxygen2O3(very small amount aluminium nitride), together
When there is part pure aluminum to dissolve in steel, this part pure aluminum can by acid dissolving be referred to as dissolved aluminum, the present invention control Als content exist
0.015wt%~0.080wt%, preferably Als content are 0.018wt%~0.065wt%.
According to the present invention, each component in above-mentioned preferred scope can further improve low-temperature pressure container forging in room
Yield strength, tensile strength and Longitudinal extending rate under temperature；And impact absorbing energy of the forging at -60 DEG C.
According to the present invention, the gas content in the forging：[N]≤50ppm, [O]≤20ppm, [H]≤1.5ppm.
According to the present invention, the prior austenite grain size of the forging is generally 6 grades or thinner.
According to low-temperature pressure container forging of the present invention, A classes, B classes, C classes, D classes and DS that the forging contains
Type impurity is generally not more than 0.5 grade；Wherein, thick, the thin serial sum of A classes, B classes, C classes and D type impurities is not generally
More than 1.5 grades.
Wherein, the concept of A classes, B classes, C classes, D classes and DS type impurities is known to those skilled in the art.Refer specifically to
It is：A classes are sulfide, and B classes are aluminum oxide, and C classes are silicate, and D classes are spherical oxide, and DS classes are that individual particle is spherical.
According to the present invention, the room-temperature mechanical property of the forging includes：As thickness≤200mm of forging, the forging
Yield strength >=400MPa, tensile strength is 520~610MPa, Longitudinal extending rate A50mm>=32% (gauge length 50mm)；When
200mm ＜ thickness≤300mm of forging, yield strength >=390MPa of the forging, tensile strength are 500~600MPa, are indulged
To elongation percentage A50mm>=28%.
According to the second aspect of the invention, the invention provides a kind of preparation side of the low-temperature pressure container forging
Method, this method comprise the following steps：
1) refining of steel：Raw material is smelted, then carries out external refining and application of vacuum successively；
2) forging is molded：By continuous casting or molding manufacture steel billet, then using forcing press forging molding；
3) it is heat-treated：The condition of delivery for being molded forging is quenching+tempering.
Normally, in step 1), the raw material can use electric arc furnaces or oxygen coverter to be smelted, with specific reference to raw material
Species select.
In step 2), the forging ratio of its main cross section can be 4~8 when the forging is molded.
In step 3), the temperature of the quenching can be 890~940 DEG C, and the temperature of tempering can be 580~640 DEG C.
External refining and application of vacuum of the present invention can be carried out by this area common process and equipment.
Below will the present invention will be described in detail by embodiment and comparative example.
Embodiment 1
A kind of low-temperature pressure container forging, the preparation method of the forging comprise the following steps：
1) refining of steel：Raw material is smelted using electric arc furnaces, then carries out LF external refinings, finally carries out VD vacuum and takes off
Gas；
2) forging is molded：Steel billet is manufactured by continuous casting process first, then is using forcing press forging molding, obtained thickness
100mm forging, the chemical composition of the forging are as shown in table 1；
3) it is heat-treated：The condition of delivery for being molded forging is quenching+tempering, and the phase transition temperature Ac1 of forging is 690 after measured
DEG C, Ac3 is 864 DEG C, and Ar1 is 580 DEG C, and Ar3 is 785 DEG C, and hardening heat selects 890 DEG C, and temperature selects 630 DEG C.
Embodiment 2
Embodiment with embodiment 1, wherein, be made forging thickness be 150mm, the chemical composition of forging is as shown in table 1,
Hardening heat selects 910 DEG C, and temperature selects 615 DEG C.
Embodiment 3
Embodiment with embodiment 1, wherein, be made forging thickness be 200mm, the chemical composition of forging is as shown in table 1,
Hardening heat selects 930 DEG C, and temperature selects 590 DEG C.
Embodiment 4
Embodiment with embodiment 1, wherein, be made forging thickness be 250mm, the chemical composition of forging is as shown in table 1,
Hardening heat selects 940 DEG C, and temperature selects 640 DEG C.
Comparative example 1
Embodiment is with embodiment 1, and difference is, the chemical composition that forging is made is as shown in table 1.
Comparative example 2
Embodiment is with embodiment 1, and difference is, the chemical composition that forging is made is as shown in table 1.
The chemical composition that forging is made in above-described embodiment and comparative example is as shown in table 1.
Table 1
The room-temperature mechanical property of forging is as shown in table 2 made from above-described embodiment and comparative example.
Table 2
The chemical composition and room-temperature mechanical property of forging obtained by embodiment in Tables 1 and 2 and comparative example, the present invention
Low-temperature pressure container prepared by embodiment forging has >=400MPa a yield strength, 556~596MPa tensile strength, >=
32% room temperature elongation percentage, is superior to the forging prepared by comparative example.
In addition, it is 6.5 grades or thinner according to the prior austenite grain size of GB/T6394 method measure embodiment forging.According to
B methods measure inclusion content in each forging in GB/T10561, wherein, A classes, B classes, C classes, D classes and DS type impurities no more than
0.5 grade；Wherein, thick, the thin serial sum of A classes, B classes, C classes and D type impurities is no more than 1.5 grades.Gas in forging contains
Amount：[N]≤50ppm, [O]≤15ppm, [H]≤1.5ppm.
The forging prepared in embodiment and comparative example is subjected to Charpy (v-notch) impact test, every kind of forging is at least done
Three parallel samples, the average value of three samples is taken, the impact absorbing energy of forging is as shown in table 3 at each temperature.
Table 3
As shown in Table 3, forging of the invention has higher toughness under cryogenic, disclosure satisfy that the need of practical application
Will, at -60 DEG C, impact absorbing energy KV2 >=60J of forging of the invention.
It is described above embodiments of the invention, described above is exemplary, and non-exclusive, and also not
It is limited to disclosed embodiment.In the case of the scope and spirit without departing from illustrated embodiment, for the art
Many modifications and changes will be apparent from for those of ordinary skill.
Claims (10)
1. a kind of low-temperature pressure container forging, it is characterised in that on the basis of the weight of the forging, the forging contains by weight
Measure the following chemical composition of percentage meter：C：0.09~0.16%, Si：0.15~0.50%, Mn：0.85~1.70%, S：≤
0.010%, P：≤ 0.020%, Ni：0.30~0.86%, Nb：≤ 0.05%, Cu：≤ 0.30%, V：≤ 0.05%, Als：
0.015~0.080%, remaining is Fe and inevitable impurity, wherein, the content of each component is not 0；The forging-
Impact absorbing energy KV2 >=52J at 60 DEG C.
2. low-temperature pressure container forging as claimed in claim 1, wherein, on the basis of the weight of the forging, the forging
Following chemical composition containing percentage：C：0.10~0.15%, Si：0.15~0.45%, Mn：1.05~
1.58%, S：≤ 0.009%, P：≤ 0.016%, Ni：0.42~0.76%, Nb：≤ 0.04%, Cu：≤ 0.28%, V：≤
0.03%, Als：0.018~0.065%, remaining is Fe and inevitable impurity, wherein, the content of each component is not 0；
Impact absorbing energy KV2 >=60J of the forging at -60 DEG C.
3. low-temperature pressure container forging as claimed in claim 1 or 2, wherein, the gas content in the forging：[N]≤
50ppm, [O]≤20ppm, [H]≤1.5ppm.
4. low-temperature pressure container forging as claimed in claim 1, wherein：The prior austenite grain size of the forging is for 6 grades or more
Carefully.
5. low-temperature pressure container forging as claimed in claim 1, wherein, A classes that the forging contains, B classes, C classes, D classes
With DS type impurities no more than 0.5 grade；Wherein, thick, the thin serial sum of A classes, B classes, C classes and D type impurities no more than
1.5 level.
6. low-temperature pressure container forging as claimed in claim 1, wherein, the room-temperature mechanical property of the forging includes：When
During thickness≤200mm of forging, yield strength >=400MPa of the forging, tensile strength is 520~610MPa, Longitudinal extending
Rate A50mm>=32%；When 200mm ＜ thickness≤300mm of forging, yield strength >=390MPa of the forging, tensile strength are
500~600MPa, Longitudinal extending rate A50mm>=28%.
7. a kind of preparation method of the low-temperature pressure container forging in claim 1~6 described in any one, its feature exist
In this method comprises the following steps：
1) refining of steel：Raw material is smelted, then carries out external refining and application of vacuum successively；
2) forging is molded：By continuous casting or molding manufacture steel billet, then using forcing press forging molding；
3) it is heat-treated：The condition of delivery for being molded forging is quenching+tempering.
8. the preparation method of low-temperature pressure container forging as claimed in claim 7, wherein, in step 1), the raw material is adopted
Smelted with electric arc furnaces or oxygen coverter.
9. the preparation method of low-temperature pressure container forging as claimed in claim 7, wherein, in step 2), the forging into
The forging ratio of its main cross section is 4~8 during type.
10. the preparation method of low-temperature pressure container forging as claimed in claim 7, wherein, in step 3), the quenching
Temperature is 890~940 DEG C, and the temperature of tempering is 580~640 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610815318.4A CN107805754A (en) | 2016-09-09 | 2016-09-09 | A kind of low-temperature pressure container forging and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610815318.4A CN107805754A (en) | 2016-09-09 | 2016-09-09 | A kind of low-temperature pressure container forging and preparation method thereof |
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| CN107805754A true CN107805754A (en) | 2018-03-16 |
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ID=61569716
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101831586A (en) * | 2010-04-30 | 2010-09-15 | 南京钢铁股份有限公司 | Low-carbon equivalent weight high-strength thick steel plate with excellent low-temperature toughness and manufacture method |
| 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 |
| CN103614630A (en) * | 2013-11-14 | 2014-03-05 | 南京钢铁股份有限公司 | Steel for high-strength bridge and manufacturing method of steel |
| CN104561772A (en) * | 2014-12-26 | 2015-04-29 | 南阳汉冶特钢有限公司 | Ultralow-temperature steel plate with thickness of 130-150 mm and production method for ultralow-temperature steel plate |
-
2016
- 2016-09-09 CN CN201610815318.4A patent/CN107805754A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101831586A (en) * | 2010-04-30 | 2010-09-15 | 南京钢铁股份有限公司 | Low-carbon equivalent weight high-strength thick steel plate with excellent low-temperature toughness and manufacture method |
| 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 |
| CN103614630A (en) * | 2013-11-14 | 2014-03-05 | 南京钢铁股份有限公司 | Steel for high-strength bridge and manufacturing method of steel |
| CN104561772A (en) * | 2014-12-26 | 2015-04-29 | 南阳汉冶特钢有限公司 | Ultralow-temperature steel plate with thickness of 130-150 mm and production method for ultralow-temperature steel plate |
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| Title |
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| 宋世昌等: "《天然气地面工程设计》", 31 May 2014, 中国石化出版社 * |
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