CN107805757A - A kind of low alloy steel and preparation method thereof - Google Patents
A kind of low alloy steel and preparation method thereof Download PDFInfo
- Publication number
- CN107805757A CN107805757A CN201610815362.5A CN201610815362A CN107805757A CN 107805757 A CN107805757 A CN 107805757A CN 201610815362 A CN201610815362 A CN 201610815362A CN 107805757 A CN107805757 A CN 107805757A
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- Prior art keywords
- steel pipe
- steel
- low alloy
- temperature
- alloy steel
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Classifications
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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
- C21—METALLURGY OF IRON
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
- C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
Abstract
The present invention provides a kind of low alloy steel and preparation method thereof, and on the basis of the weight of the steel pipe, the steel pipe contains the following chemical composition of percentage：C：0.05~0.15%, Cr：1.00~1.50%, Mo：0.44~0.65%, Mn：0.30~0.60%, Si：0.50~0.80%, V：≤ 0.05%, Nb：≤ 0.05%, S：≤ 0.010%, P：≤ 0.020%, remaining is Fe and inevitable impurity, wherein, the content of each component is not 0.The steel pipe with higher heat resistance, it is strong with higher intensity and toughness, high-temperature resistance hydrogen corrosive nature at high temperature.
Description
Technical field
The present invention relates to the pressure vessel applied to petrochemical industry, coal chemical industry etc. and pressure pipeline field, and in particular to one
Kind low alloy steel and preparation method thereof.
Background technology
It is increasing as the processing capacity of domestic high-sulfur and high-acid crude oil is more and more, and to the demand of clean energy resource,
Oil refining and the device of coal chemical industry also largely start, the characteristics of these devices：High temperature, high-sulfur, peracid face hydrogen.In order to tackle device
In these environment, largely use Cr-Mo steel, Cr-Mo steel high temperature resistant property is good, including high temperature oxidation resistance, in high temperature
Under have higher-strength, good high-temperature resistance hydrogen corrosive power etc..
But with the complication of refinery feedstock, the manufacture of oil refining apparatus is also required to develop therewith, on device
The intensity of Cr-Mo steel, toughness and high-temperature resistance hydrogen corrosive nature still need raising badly.Therefore, it is necessary to develop a kind of high-temperature hydro-refining
The economic, practical low alloy steel of environment.
The content of the invention
To solve the above-mentioned problems in the prior art, the invention provides a kind of low alloy steel and its preparation side
Method.The low alloy steel being prepared is with higher heat resistance, at high temperature with higher intensity and toughness, high-temperature resistance hydrogen
Corrosive nature is strong.
According to the first aspect of the invention, the invention provides a kind of low alloy steel, on the basis of the weight of the steel pipe,
The steel pipe contains the following chemical composition of percentage：C：0.05~0.15%, Cr：1.00~1.50%, Mo：
0.44~0.65%, Mn：0.30~0.60%, Si：0.50~0.80%, V：≤ 0.05%, Nb：≤ 0.05%, S：≤
0.010%, P：≤ 0.020%, remaining is Fe and inevitable impurity, wherein, the content of each component is not 0.
According to the second aspect of the invention, the invention provides a kind of preparation method of the low alloy steel, the preparation
Method comprises the following steps：
1) refining of steel：Raw material is smelted；
2) steel pipe forming：Pipe is manufactured by continuous casting or the method for molding, then is molded using hot rolling or cold rolling；
3) it is heat-treated：The condition of delivery of shaping steel tube is normalizing+tempering.
The room-temperature mechanical property of the low alloy steel of the present invention includes：Yield strength >=340MPa；Tensile strength 530~
690MPa；Longitudinal extending rate A50mm>=36%；The steel pipe is at 100~525 DEG C：Proof strength of non-proportional Rp0.2 is
215~325MPa, tensile strength RmFor 435~525MPa；The temper embrittlement sensitivity coefficient of the steel pipe：X=(10P+5Sb+
4Sn+As)×10-2≤ 12ppm, J=(Si+Mn) (P+Sn) × 108≤ 160, each element is according to percent by weight in formula；When
Diameter of phi >=76mm of the steel pipe, and during wall thickness >=14mm, impact absorbing energy KV2 >=75J of the steel pipe at 20 DEG C,
Impact absorbing energy KV2 >=60J at -30 DEG C.
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 alloy steel, on the basis of the weight of the steel pipe,
The steel pipe contains the following chemical composition of percentage：C：0.05~0.15%, Cr：1.00~1.50%, Mo：
0.44~0.65%, Mn：0.30~0.60%, Si：0.50~0.80%, V：≤ 0.05%, Nb：≤ 0.05%, S：≤
0.010%, P：≤ 0.020%, remaining is Fe and inevitable impurity, wherein, the content of each component is not 0.
Preferably, low alloy steel of the invention, on the basis of the weight of the steel pipe, the steel pipe contains percentage by weight
The following chemical composition of number meter：C：0.09~0.13%, Cr：1.20~1.50%, Mo：0.50~0.65%, Mn：0.40~
0.50%, Si：0.60~0.80%, V：≤ 0.04%, Nb：≤ 0.03%, S：≤ 0.005%, P：≤ 0.015%, remaining is
Fe and inevitable impurity, wherein, the content of each component is not 0.
According to the present invention, the effect of main chemical compositions is as follows in described low alloy steel：
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, while in order to reduce the wall thickness of steel pipe as far as possible, C of the invention content control 0.05wt%~
Between 0.15wt%, preferably C content is 0.09wt%~0.13wt%.
Cr：Chromium can significantly improve intensity, hardness and wearability, but reduce plasticity and toughness simultaneously；Chromium and can improves steel
Inoxidizability and corrosion resistance, thus be stainless steel, the important alloying element of carbon steel.The Cr of present invention content control exists
Between 1.00wt%~1.50wt%, preferably Cr content is 1.20wt%~1.50wt%.
Mo：Molybdenum can make the crystal grain refinement of steel, improve quenching degree and thermostrength, and enough intensity and anti-is kept in high temperature
Creep ability (is stressed, deformed, claim creep) at high temperature for a long time.Molybdenum is added in structural steel, mechanical performance can be improved,
Steel alloy fragility caused by fire can also be suppressed.Red property can be improved in tool steel.The Mo of present invention content control
In the range of 0.44wt%~0.65wt%, preferably Mo content is 0.50wt%~0.65wt%.
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 0.30wt%
In the range of~0.60wt%, preferably Mn content is 0.40wt%~0.50wt%.
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 0.50wt%~0.80wt%, preferably Si content is 0.60wt%~0.80wt%.
V：Vanadium dramatically increases the reheat cracking susceptibility of forging steel pipe, while the reciprocation between the niobium in steel, plays
The effect of niobium vanadium complex intensifying, so as to compensate for the decline situation of the steel strength caused by carbon content decline in steel, limit V
Content≤0.05wt%, preferably V content≤0.04wt%.
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 steel pipe, present invention control Nb content≤
0.05wt%, preferably Nb content≤0.03wt%.
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 contents are controlled in below 0.010wt%, preferably S content≤0.005wt%；Phosphorus is easily in crystalline substance
Boundary's segregation, crystal boundary resistance to crack extension ability is reduced, reduce low-temperature flexibility, P content is controlled in below 0.020wt%, preferably P
Content≤0.015wt%.
, according to the invention it is preferred to can further to improve the surrender of low alloy steel at room temperature strong for each component in scope
Degree, tensile strength and elongation percentage；And Proof strength of non-proportional and tensile strength under its high temperature.
According to the present invention, the prior austenite grain size of the low alloy steel can be 7 grades or thinner.
According to the present invention, the low alloy steel is in the case where facing hydrogen environment in use, its temper embrittlement sensitivity coefficient can be with
Reach：X=(10P+5Sb+4Sn+As) × 10-2≤ 12ppm, J=(Si+Mn) (P+Sn) × 108≤ 160, each element is pressed in formula
According to percent by weight.
According to the low alloy steel of the present invention, the room-temperature mechanical property of the steel pipe includes：Yield strength (Rel)≥
340MPa；Tensile strength (Rm) it is 530~690MPa；Longitudinal extending rate A50mm>=36% (gauge length 50mm).
According to the present invention, the mechanical behavior under high temperature of the steel pipe includes：At 100~525 DEG C, the regulation of the steel pipe is non-
Ratio extension strength Rp0.2 is 215~325MPa, tensile strength RmFor 435~525MPa.
According to the present invention, as diameter of phi >=76mm of the steel pipe, and during wall thickness >=14mm, the steel pipe is at 20 DEG C
Impact absorbing energy KV2 >=75J；Face in hydrogen environment, impact absorbing energy KV2 >=60J of the steel pipe at -30 DEG C.
According to the second aspect of the invention, the invention provides a kind of preparation method of the low alloy steel, the preparation
Method comprises the following steps：
1) refining of steel：Raw material is smelted；
2) steel pipe forming：Pipe is manufactured by continuous casting or the method for molding, then is molded using hot rolling or cold rolling；
3) it is heat-treated：The condition of delivery of shaping steel tube is normalizing+tempering.
Normally, in step 1), the refining of the steel can use electric arc furnaces or oxygen coverter raw materials for metallurgy, then enter successively
Row external refining and application of vacuum；Raw material can also be smelted using electroslag remelting process.
In step 3), the described condition of delivery includes：During thickness of steel pipe S≤30mm, the temperature of normalizing is 900~960 DEG C,
The temperature of tempering is 650~690 DEG C；Thickness of steel pipe S>During 30mm, the temperature of normalizing is 900~960 DEG C, and the temperature of tempering is
650~690 DEG C, and cooling is accelerated with 2~20 DEG C/s cooling velocity after steel pipe normalizing.
External refining and application of vacuum of the present invention can be carried out by this area common process and equipment.
The present invention will be described in detail by way of examples below.
Embodiment 1
A kind of low alloy steel, specification are Φ 356 × 35, and the preparation method of the steel pipe comprises 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) steel pipe forming：Steel billet is manufactured by continuous casting process, then using hot-roll forming, the chemical composition such as table of obtained steel pipe
Shown in 1；
3) it is heat-treated：The condition of delivery of shaping steel tube is normalizing+tempering, and normalizing temperature selects 930 DEG C, after normalizing with 5 DEG C/
S cooling velocity accelerates cooling, and temperature selects 665 DEG C.
Embodiment 2
Embodiment with embodiment 1, wherein, the chemical composition of obtained steel pipe is as shown in table 1, normalizing temperature select 910
DEG C, temperature selects 650 DEG C.
Embodiment 3
Embodiment with embodiment 1, wherein, the chemical composition of obtained steel pipe is as shown in table 1, normalizing temperature select 940
DEG C, temperature selects 660 DEG C.
Embodiment 4
Embodiment with embodiment 1, wherein, the chemical composition of obtained steel pipe is as shown in table 1, normalizing temperature select 950
DEG C, temperature selects 680 DEG C.
Comparative example 1
Embodiment is with embodiment 1, and difference is, the chemical composition of obtained steel pipe is as shown in table 1.
Comparative example 2
Embodiment is with embodiment 1, and difference is, the chemical composition of obtained steel pipe is as shown in table 1.
The chemical composition of steel pipe is as shown in table 1 made from above-described embodiment and comparative example.
Table 1
Embodiment and the room-temperature mechanical property of steel pipe and prior austenite grain size made from comparative example are as shown in table 2.
Table 2
* tensile sample is longitudinal direction.
Chemical composition, room-temperature mechanical property and the grain size number evidence of steel pipe obtained by embodiment in Tables 1 and 2 and comparative example
Understand, low alloy steel of the invention has >=340MPa yield strength, tensile strength >=550MPa, room temperature elongation percentage A50mm
>=36%, it is superior to comparative example.
The prior austenite grain size that method according to GB/T6394 determines embodiment steel pipe is 7 grades or thinner.
Embodiment and the mechanical behavior under high temperature of steel pipe made from comparative example are as shown in table 3.
As shown in Table 3, the mechanical behavior under high temperature of steel pipe of the invention includes：At 100~525 DEG C, the rule of the steel pipe
Determine nonproportional cyclic straining Rp0.2 can reach 227~325MPa, tensile strength Rm471~525MPa is can reach, better than comparative example.
Table 3
Carry out Charpy (v-notch) Impulse Test Result for the steel pipe that embodiment is prepared with comparative example is as shown in table 4.
Table 4
* impact specimen is laterally, shown KV2 values is the average value of three samples.
As shown in Table 4, steel pipe of the invention has higher toughness under cryogenic, disclosure satisfy that the need of practical application
Will, at -30 DEG C, impact absorbing energy KV2 >=60 of steel pipe of the invention, impact absorbing energy KV2 at 20 DEG C >=
75J。
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 alloy steel, it is characterised in that on the basis of the weight of the steel pipe, the steel pipe contains weight percent
The following chemical composition of meter：C：0.05~0.15%, Cr：1.00~1.50%, Mo：0.44~0.65%, Mn：0.30~
0.60%, Si：0.50~0.80%, V：≤ 0.05%, Nb：≤ 0.05%, S：≤ 0.010%, P：≤ 0.020%, remaining is
Fe and inevitable impurity, wherein, the content of each component is not 0.
2. low alloy steel as claimed in claim 1, wherein, on the basis of the weight of the steel pipe, the steel pipe contains by weight
Measure the following chemical composition of percentage meter：C：0.09~0.13%, Cr：1.20~1.50%, Mo：0.50~0.65%, Mn：
0.40~0.50%, Si：0.60~0.80%, V：≤ 0.04%, Nb：≤ 0.03%, S：≤ 0.005%, P：≤ 0.015%,
Remaining is Fe and inevitable impurity, wherein, the content of each component is not 0.
3. low alloy steel as claimed in claim 1 or 2, wherein, the prior austenite grain size of the steel pipe is 7 grades or thinner.
4. low alloy steel as claimed in claim 1 or 2, wherein, temper embrittlement of the steel pipe in hydrogen environment is faced is sensitive
Property coefficient：X=(10P+5Sb+4Sn+As) × 10-2≤ 12ppm, J=(Si+Mn) (P+Sn) × 108≤ 160, each element in formula
According to percent by weight.
5. low alloy steel as claimed in claim 1, wherein, the room-temperature mechanical property of the steel pipe includes：Yield strength >=
340MPa, tensile strength are 530~690MPa, Longitudinal extending rate A50mm>=36%.
6. low alloy steel as claimed in claim 1, wherein, the mechanical behavior under high temperature of the steel pipe includes：100~525
At DEG C, the Proof strength of non-proportional R of the steel pipep0.2 is 215~325MPa, tensile strength RmFor 435~525MPa.
7. low alloy steel as claimed in claim 1, wherein, as diameter of phi >=76mm of the steel pipe, and wall thickness >=14mm
When, the steel pipe impact absorbing energy KV2 >=75J at 20 DEG C, impact absorbing energy KV2 >=60J at -30 DEG C.
A kind of 8. preparation method of the low alloy steel in claim 1~7 described in any one, it is characterised in that the preparation
Method comprises the following steps：
1) refining of steel：Raw material is smelted；
2) steel pipe forming：Pipe is manufactured by continuous casting or the method for molding, then is molded using hot rolling or cold rolling；
3) it is heat-treated：The condition of delivery of shaping steel tube is normalizing+tempering.
9. the preparation method of low alloy steel as claimed in claim 8, wherein, in step 1), the refining of the steel is use
Electric arc furnaces or oxygen coverter raw materials for metallurgy, then external refining and application of vacuum are carried out successively；Or using electroslag remelting process to raw material
Smelted.
10. the preparation method of low alloy steel as claimed in claim 8, wherein, in step 3), described condition of delivery bag
Include：During thickness of steel pipe S≤30mm, the temperature of normalizing is 900~960 DEG C, and the temperature of tempering is 650~690 DEG C；Thickness of steel pipe S
During ＞ 30mm, the temperature of normalizing is 900~960 DEG C, and the temperature of tempering is 650~690 DEG C, and after steel pipe normalizing with 2~20 DEG C/
S cooling velocity accelerates cooling.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610815362.5A CN107805757A (en) | 2016-09-09 | 2016-09-09 | A kind of low alloy steel and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610815362.5A CN107805757A (en) | 2016-09-09 | 2016-09-09 | A kind of low alloy steel and preparation method thereof |
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ID=61569777
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108396227A (en) * | 2018-05-09 | 2018-08-14 | 舞阳钢铁有限责任公司 | Continuous casting billet is become a useful person A387Gr11Cl2 steel plates and its production method |
| CN110895274A (en) * | 2018-09-11 | 2020-03-20 | 中国石化工程建设有限公司 | Method for testing temper brittleness of steel and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108396227A (en) * | 2018-05-09 | 2018-08-14 | 舞阳钢铁有限责任公司 | Continuous casting billet is become a useful person A387Gr11Cl2 steel plates and its production method |
| CN110895274A (en) * | 2018-09-11 | 2020-03-20 | 中国石化工程建设有限公司 | Method for testing temper brittleness of steel and application thereof |
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Application publication date: 20180316 |