CN109321819A - Low yield strength ratio high tenacity resistant to sulfuric acid dew point corrosion sheet metal and its production method - Google Patents
Low yield strength ratio high tenacity resistant to sulfuric acid dew point corrosion sheet metal and its production method Download PDFInfo
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
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- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
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- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- 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
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
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Abstract
The invention discloses a kind of low yield strength ratio high tenacity resistant to sulfuric acid dew point corrosion sheet metal and its production methods, the sheet metal chemical component composition and its mass percentage are as follows: C:0.11~0.14%, Si:0.35~0.50%, Mn:0.80~0.90%, P≤0.008%, S≤0.002%, Al:0.020~0.040%, Cr:0.65~0.85%, Cu:0.35~0.45%, Ca:0.0015~0.0030%, surplus are Fe and inevitable impurity；The production method includes smelting, continuous casting, heating, rolling process.Sheet metal yield tensile ratio of the present invention is low, and impact toughness at room temperature and corrosion resistance to sulfuric acid dew point are excellent, and there is good comprehensive performance and welding performance can be widely used for making the fields such as the technical pattern part of acidproof corrosion-resistant environment, have a extensive future with a thickness of 8~35mm.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of thin steel of low yield strength ratio high tenacity resistant to sulfuric acid dew point corrosion
Plate and its production method.
Background technique
The sulphuric acid dew point in the smoke processing system using coal or heavy oil as main fuel such as metallurgy, electric power, petroleum and chemical industry
Corrosion can cause its equipment greatly to destroy.Can be used non-metallic coating avoid to a certain extent component atmospheric corrosion and
Corrosion of sulfuric acid at dew point.But difficulty of construction is big, while influencing heat exchange efficiency.The most ideal scheme for solving the problems, such as this is exactly in atmosphere
The steel with atmospheric corrosion and corrosion resistance to sulfuric acid dew point are used under corrosion and corrosion of sulfuric acid at dew point environment.
Currently, corrosionproof steel against sulfuric acid at dew point is mainly based on Cr-Cu-Sb set member.Such as patent publication No. CN1490427A
The 09CrCuSb for seamless steel pipe manufacture disclosed；Patent publication No. be CN101892439A, CN101831598A,
The manufacturing method of Cr-Cu-Sb system steel for resisting sulfuric acid dew point corrosion ingredient and coil of strip that CN101736202A is disclosed.In this ingredient
In system, Sb element is the element of the main corrosion resistance to sulfuric acid dew point for improving steel, but Sb meeting is added in the steel containing Cu
Further deteriorate its hot-short performance, the surface for easily leading to billet surface and hot-strip generates pattern cracking.Moreover, above-mentioned patent
Apply for the yield strength (including 235MPa, 315MPa and 345MPa grades) of disclosed corrosionproof steel against sulfuric acid at dew point material, in the patent
The yield tensile ratio (yield strength/tensile strength) of corrosionproof steel against sulfuric acid at dew point material excessively high about 0.87, is there is antidetonation and deformation requirements
And with low yield strength ratio (yield tensile ratio of shockproof requirements steel is below 0.80) while needing steel with high-yield strength
Requirement is unable to satisfy in.
Therefore exploitation degree of purity is high, and yield tensile ratio is low, and impact toughness at room temperature and corrosion resistance to sulfuric acid dew point are excellent, has good
The sheet metal of good comprehensive performance and welding performance, has a extensive future, and has biggish Social benefit and economic benefit.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of low yield strength ratio high tenacity resistant to sulfuric acid dew point corrosion sheet metals；
The present invention also provides a kind of production methods of low yield strength ratio high tenacity resistant to sulfuric acid dew point corrosion sheet metal.
In order to solve the above technical problems, the technical solution used in the present invention is: a kind of resistance to sulfuric acid of low yield strength ratio high tenacity
Dew point corrosion sheet metal, the sheet metal chemical component composition and its mass percentage are as follows: C:0.11~0.14%, Si:
0.35~0.50%, Mn:0.80~0.90%, P≤0.008%, S≤0.002%, Al:0.020~0.040%, Cr:0.65~
0.85%, Cu:0.35~0.45%, Ca:0.0015~0.0030%, surplus are Fe and inevitable impurity.
Sheet metal of the present invention is with a thickness of 8~35mm.
Sheet metal mechanical property of the present invention: yield strength 345MPa~400MPa, tensile strength 480MPa~
520MPa, yield tensile ratio 0.72~0.80, room temperature ballistic work are averaged 250~300J；Corrosion resistance to sulfuric acid dew point: corrosion rate
5.60~5.80mg/cm2h。
It is described the present invention also provides a kind of production method of low yield strength ratio high tenacity resistant to sulfuric acid dew point corrosion sheet metal
Production method includes smelting, continuous casting, heating, rolling process；The rolling process, using two-stage rolling mill practice, single pass pressure
Lower rate is 10~30%, and adding up reduction ratio is 30~50%, after the completion of rolling, and 8mm≤d≤15mm thick steel plate uses air-cooled, 15mm
< d≤35mm thick steel plate uses water cooling, and wherein d is finished steel plate thickness.
Rolling process of the present invention, using two-stage rolling mill practice；First stage is austenite recrystallization stage, open rolling
Temperature is 1050~1100 DEG C, and finishing temperature is 920~950 DEG C, and single pass reduction ratio is 10~30%, and adding up reduction ratio is 30
~50%.
Rolling process of the present invention, second stage are the austenite non-recrystallization stage, and start rolling temperature is 870~910 DEG C,
Finishing temperature is 800~860 DEG C, and single pass reduction ratio is 10~30%, and adding up reduction ratio is 30~50%.
Rolling process of the present invention, after the completion of rolling, 8mm≤d≤15mm thick steel plate is using air-cooled；15mm < d≤
35mm thick steel plate uses water cooling, is cooled to 600~650 DEG C with the cooling velocity of 10~15 DEG C/s, and wherein d is finished steel plate thickness
Degree.
Smelting procedure of the present invention, molten steel are first smelted through first furnace, be sent into LF refining furnace refining, using increase the quantity of slag and
Repeatedly stream slag, in favor of taking off P, the quantity of slag is in 15.80~16.20kg/t steel, a small amount of more batches of additions of slag charge, white slag atmosphere retention time
>=15min, Al in slag2O3Content be 20~35%, FeO content is 10~15% in slag, refining terminate to stay the quantity of slag 9.80~
10.20kg/t steel, the stirring of LF furnace Argon, 100~150L/min of preceding 15min argon flow, 30~50L/ of rear 10min argon flow
min；Bull ladle VD furnace is vacuum-treated when big packet temperature >=1580 DEG C, and 1.5~1.8kg/t steel is first fed into molten steel in refining process
Aluminum steel and 4.5~5.5kg/t steel Si-Ca line, add the calcium carbide deoxidizer of 1.5~2.0kg/t steel, when vacuum processing is true
Reciprocal of duty cycle≤66Pa, vacuum retention time >=20min.
Heating process of the present invention, continuous casting billet heat in continuous-type furnace, maximum heating temperature 1210~1230
DEG C, total heating time >=11min/mm.
Molten steel after smelting is carried out continuous casting by continuous casting working procedure of the present invention, and when continuous casting carries out electromagnetic agitation, electromagnetic agitation
Electric current is 380~400A, 5Hz, and reinforcement solidification end is cold by force, obtains continuous casting billet；10~20 DEG C of molten steel overheat, drawing speed is
0.80~1.00min/mm.
The mechanism of action of each component of the present invention and content is as follows:
Carbon: carbon is the element of stable austenite, as carbon content increase is easy to appear carbide segregation, causes the hardness of line of segragation
There is difference with surrounding tissue, leads to corrosion-resistant weakening.
Silicon: the intensity of steel is improved with solution strengthening form, and is conducive to the corrosion resistance of steel.
Manganese: being the effective element of reinforcing to steel.Solution strengthening effect is played to make up in steel and cause because C content reduces
Loss of strength.When Mn content is lower than 0.8% in steel, it is unable to give full play the effect that intensity ensures, but work as Mn content
Corrosion resistance is deteriorated when excessively high.
Copper: improving the basic element of corrosion resistance of steel energy, steel can be promoted to generate anodic passivity, to reduce the corruption of steel
Speed is lost, Cr and Cu, Si element are used cooperatively the corrosion resistance that can significantly improve steel.Cause
Electrode potential for Cr and Ni is lower, has passivation tendency, becomes apparent from, can be obviously mentioned with the use of effect with Cu
The corrosion resisting property of Gao Gang.
Phosphorus, sulphur: for the field trash in steel, easily forming the defects of being segregated, being mingled with, although S plays corrosion of sulfuric acid at dew point performance
To certain effect, but undesirable influence can be brought to the toughness of steel plate and hot-working as impurity element, it should should be as far as possible
Reduce its content.
Calcium: the sulfate CaSO of infusibility is formed with effect of sulfuric acid4, deposited in metal surface, be conducive to repair metal watch
The passivating film in face plays the role of that steel surface is prevented to be further corroded by atmosphere and sulfuric acid, to play corrosion resistant.
Low yield strength ratio high tenacity resistant to sulfuric acid dew point corrosion of the present invention sheet metal properties of product detection method canonical reference GB/
T228,GB229；Product corrosion resistance to sulfuric acid dew point detection method canonical reference JB/T7901.
The beneficial effects of adopting the technical scheme are that 1, sheet metal steel of the present invention is purer, P≤
0.008%, S≤0.002%.2, sheet metal mechanical property of the present invention: 345~400MPa of yield strength, tensile strength 480~
520MPa, yield tensile ratio 0.72~0.80, room temperature ballistic work are averaged 250~300J.3, sheet metal resistant to sulfuric acid dew point corrosion of the present invention
Function admirable, 5.60~5.80mg/cm of corrosion rate2h.4, sheet metal of the present invention is with a thickness of 8~35mm.5, sheet metal of the present invention
Compared with more common 09CrCuSb steel, the element sb for deteriorating its hot-short performance is not added, is conducive to the hot-workability of steel
Can, while being added and easily generating CaSO4Ca element, pass through generate CaSO4Effectively the anti-corrosion passivating film of steel surface is repaired
It is multiple not reduce its corrosion resistance to sulfuric acid dew point while ensure that steel hot-working character to improve its corrosion resistance,
Yield tensile ratio is low compared with 09CrCuSb steel, under the conditions of similar corrosion resistance to sulfuric acid dew point, impact flexibility is excellent.6, the present invention is
Hot rolled steel plate, steel for resisting sulfuric acid dew point corrosion plate is coiled sheet in existing technology, and the thickness and width of coiled sheet is both limited by plate
The manufacturing equipment and technique of volume, coiled sheet, which is difficult to do width, does thickness, the usual thickness≤25mm of coiled sheet, width≤2000mm, the thickness of steel plate
Degree and width all effected, and hot rolled steel plate is not influenced then by width and thickness, steel plate involved in the present invention can be according to reality
Border demand is accomplished wider thicker, thus its application range is also more extensively, while also facilitating the processing again of downstream user.7, originally
Invention sheet metal yield tensile ratio is low, and impact toughness at room temperature and corrosion resistance to sulfuric acid dew point are excellent, can satisfy industry and bends by force to low
Than, the requirement of high tenacity, corrosionproof steel against sulfuric acid at dew point, there is good comprehensive performance and welding performance, can be widely used for making resistance to
The fields such as the technical pattern part of the corrosion-resistant environment of acid, such as flue, the chimney structural member of power industry, the boiler of chemical industry are pre-
The equipment such as hot device and economizer, have a extensive future.
Specific embodiment
The present invention will be further described in detail below with reference to specific embodiments.
Embodiment 1
The present embodiment low yield strength ratio high tenacity resistant to sulfuric acid dew point corrosion sheet metal is with a thickness of 8mm, chemical component composition and matter
Measure percentage composition are as follows: C:0.11%, Si:0.38%, Mn:0.81%, P:0.007%, S:0.001%, Al:0.030%, Cr:0.67%,
Cu:0.38%, Ca:0.0020%, surplus are Fe and inevitable impurity.
The production method of the present embodiment low yield strength ratio high tenacity resistant to sulfuric acid dew point corrosion sheet metal include smelting, continuous casting,
Heating, rolling process, specific process step are as described below:
(1) smelting procedure: molten steel is first smelted through first furnace, feeding LF refining furnace refining, flows slag with multiple using the quantity of slag is increased, with
Conducive to de- P, the quantity of slag is added in 15.9kg/t steel, slag charge a small amount of more batches, white slag atmosphere retention time 25min, Al in slag2O3Contain
Amount is 25%, and FeO content is 10% in slag, and refining terminates to stay quantity of slag 9.9kg/t steel, the stirring of LF furnace Argon, preceding 15min argon flow
130L/min, rear 10min argon flow 45L/min；Bull ladle VD furnace is vacuum-treated at 1590 DEG C of temperature of big packet, in refining process to
The aluminum steel of 1.6kg/t steel and the Si-Ca line of 5.0kg/t steel are first fed in molten steel, add the calcium carbide deoxidizer of 1.5kg/t steel,
Vacuum degree 66Pa when vacuum processing, vacuum retention time 25min；
(2) continuous casting working procedure: carrying out continuous casting for the molten steel after smelting, and when continuous casting carries out electromagnetic agitation, electromagnetic agitation electric current be 385A,
5Hz, reinforcement solidification end is cold by force, obtains continuous casting billet；13 DEG C of molten steel overheat, drawing speed 0.90min/mm；
(3) heating process: continuous casting billet heats in continuous-type furnace, and 1220 DEG C of maximum heating temperature, total heating time is
11min/mm；
(4) rolling process: two-stage rolling mill practice is used；First stage is austenite recrystallization stage, start rolling temperature 1050
DEG C, finishing temperature is 920 DEG C, and single pass reduction ratio is 10%, and adding up reduction ratio is 40%；Second stage is austenite non-recrystallization
Stage, start rolling temperature are 900 DEG C, and finishing temperature is 850 DEG C, and single pass reduction ratio is 12%, and adding up reduction ratio is 45%；It has rolled
Cheng Hou, using air-cooled cooling.
The mechanical property of the present embodiment low yield strength ratio high tenacity resistant to sulfuric acid dew point corrosion sheet metal: yield strength
382MPa, tensile strength 520MPa, yield tensile ratio 0.73, room temperature ballistic work average out to 270J；Corrosion resistance to sulfuric acid dew point: corrosion
Rate is 5.75mg/cm2H is 5.65mg/cm with 09CrCuSb(corrosion rate2H) suitable compared to corrosion rate.
Embodiment 2
The present embodiment low yield strength ratio high tenacity resistant to sulfuric acid dew point corrosion sheet metal is with a thickness of 12mm, chemical component composition and matter
Measure percentage composition are as follows: C:0.12%, Si:0.35%, Mn:0.85%, P:0.006%, S:0.001%, Al:0.038%, Cr:0.70%,
Cu:0.40%, Ca:0.0021%, surplus are Fe and inevitable impurity.
The production method of the present embodiment low yield strength ratio high tenacity resistant to sulfuric acid dew point corrosion sheet metal include smelting, continuous casting,
Heating, rolling process, specific process step are as described below:
(1) smelting procedure: molten steel is first smelted through first furnace, feeding LF refining furnace refining, flows slag with multiple using the quantity of slag is increased, with
Conducive to de- P, the quantity of slag is added in 16kg/t steel, slag charge a small amount of more batches, white slag atmosphere retention time 23min, Al in slag2O3Content
It is 30%, FeO content is 11% in slag, and refining terminates to stay quantity of slag 10.10kg/t steel, the stirring of LF furnace Argon, preceding 15min argon flow
150L/min, rear 10min argon flow 50L/min；Bull ladle VD furnace is vacuum-treated at 1580 DEG C of temperature of big packet, in refining process to
The aluminum steel of 1.65kg/t steel and the Si-Ca line of 5.3kg/t steel are first fed in molten steel, add the calcium carbide deoxidizer of 2.0kg/t steel,
Vacuum degree 66Pa when vacuum processing, vacuum retention time 25min；
(2) continuous casting working procedure: carrying out continuous casting for the molten steel after smelting, and when continuous casting carries out electromagnetic agitation, electromagnetic agitation electric current be 390A,
5Hz, reinforcement solidification end is cold by force, obtains continuous casting billet；15 DEG C of molten steel overheat, drawing speed 0.95min/mm；
(3) heating process: continuous casting billet heats in continuous-type furnace, and 1220 DEG C of maximum heating temperature, total heating time is
11min/mm；
(4) rolling process: two-stage rolling mill practice is used；First stage is austenite recrystallization stage, start rolling temperature 1080
DEG C, finishing temperature is 920 DEG C, and single pass reduction ratio is 12%, and adding up reduction ratio is 40%；Second stage is austenite non-recrystallization
Stage, start rolling temperature are 900 DEG C, and finishing temperature is 860 DEG C, and single pass reduction ratio is 11%, and adding up reduction ratio is 40%；It has rolled
Cheng Hou, using air-cooled cooling.
The mechanical property of the present embodiment low yield strength ratio high tenacity resistant to sulfuric acid dew point corrosion sheet metal: yield strength
387MPa, tensile strength 515MPa, yield tensile ratio 0.75, room temperature ballistic work average out to 250J；Corrosion resistance to sulfuric acid dew point: corrosion
Rate is 5.70mg/cm2H is 5.65mg/cm with 09CrCuSb(corrosion rate2H) suitable compared to corrosion rate.
Embodiment 3
The present embodiment low yield strength ratio high tenacity resistant to sulfuric acid dew point corrosion sheet metal is with a thickness of 25mm, chemical component composition and matter
Measure percentage composition are as follows: C:0.12%, Si:0.35%, Mn:0.85%, P:0.007%, S:0.001%, Al:0.040%, Cr:0.71%,
Cu:0.41%, Ca:0.0022%, surplus are Fe and inevitable impurity.
The production method of the present embodiment low yield strength ratio high tenacity resistant to sulfuric acid dew point corrosion sheet metal include smelting, continuous casting,
Heating, rolling process, specific process step are as described below:
(1) smelting procedure: molten steel is first smelted through first furnace, feeding LF refining furnace refining, flows slag with multiple using the quantity of slag is increased, with
Conducive to de- P, the quantity of slag is added in 16.10kg/t steel, slag charge a small amount of more batches, white slag atmosphere retention time 15min, Al in slag2O3Contain
Amount is 27%, and FeO content is 11% in slag, and refining terminates to stay quantity of slag 9.90kg/t steel, the stirring of LF furnace Argon, preceding 15min argon gas stream
Measure 145L/min, rear 10min argon flow 35L/min；Bull ladle VD furnace is vacuum-treated at big 1595 DEG C of temperature of packet, in refining process
The aluminum steel of 1.7kg/t steel and the Si-Ca line of 5.2kg/t steel are first fed into molten steel, add the calcium carbide deoxidation of 1.6kg/t steel
Agent, vacuum degree 64Pa, vacuum retention time 20min when vacuum processing；
(2) continuous casting working procedure: carrying out continuous casting for the molten steel after smelting, and when continuous casting carries out electromagnetic agitation, electromagnetic agitation electric current be 395A,
5Hz, reinforcement solidification end is cold by force, obtains continuous casting billet；13 DEG C of molten steel overheat, drawing speed 0.90min/mm；
(3) heating process: continuous casting billet heats in continuous-type furnace, and 1210 DEG C of maximum heating temperature, total heating time is
12min/mm；
(4) rolling process: two-stage rolling mill practice is used；First stage is austenite recrystallization stage, start rolling temperature 1100
DEG C, finishing temperature is 950 DEG C, and single pass reduction ratio is 10%, and adding up reduction ratio is 30%；Second stage is austenite non-recrystallization
Stage, start rolling temperature are 870 DEG C, and finishing temperature is 800 DEG C, and single pass reduction ratio is 30%, and adding up reduction ratio is 50%；It has rolled
Cheng Hou is cooled to 650 DEG C using cooling by water with the cooling velocity of 10 DEG C/s.
The mechanical property of the present embodiment low yield strength ratio high tenacity resistant to sulfuric acid dew point corrosion sheet metal: yield strength
382MPa, tensile strength 516MPa, yield tensile ratio 0.74, room temperature ballistic work average out to 260J；Corrosion resistance to sulfuric acid dew point: corrosion
Rate is 5.74mg/cm2H is 5.65mg/cm with 09CrCuSb(corrosion rate2H) suitable compared to corrosion rate.
Embodiment 4
The present embodiment low yield strength ratio high tenacity resistant to sulfuric acid dew point corrosion sheet metal is with a thickness of 35mm, chemical component composition and matter
Measure percentage composition are as follows: C:0.12%, Si:0.35%, Mn:0.85%, P:0.006%, S:0.001%, Al:0.035%, Cr:0.75%,
Cu:0.42%, Ca:0.0022%, surplus are Fe and inevitable impurity.
The production method of the present embodiment low yield strength ratio high tenacity resistant to sulfuric acid dew point corrosion sheet metal include smelting, continuous casting,
Heating, rolling process, specific process step are as described below:
(1) smelting procedure: molten steel is first smelted through first furnace, feeding LF refining furnace refining, flows slag with multiple using the quantity of slag is increased, with
Conducive to de- P, the quantity of slag is added in 15.80kg/t steel, slag charge a small amount of more batches, white slag atmosphere retention time 27min, Al in slag2O3Contain
Amount is 28%, and FeO content is 10% in slag, and refining terminates to stay quantity of slag 10.20kg/t steel, the stirring of LF furnace Argon, preceding 15min argon gas stream
Measure 135L/min, rear 10min argon flow 45L/min；Bull ladle VD furnace is vacuum-treated at big 1585 DEG C of temperature of packet, in refining process
The aluminum steel of 1.65kg/t steel and the Si-Ca line of 5.0kg/t steel are first fed into molten steel, add the calcium carbide deoxidation of 1.8kg/t steel
Agent, vacuum degree 63Pa, vacuum retention time 30min when vacuum processing；
(2) continuous casting working procedure: carrying out continuous casting for the molten steel after smelting, and when continuous casting carries out electromagnetic agitation, electromagnetic agitation electric current be 390A,
5Hz, reinforcement solidification end is cold by force, obtains continuous casting billet；13 DEG C of molten steel overheat, drawing speed 0.90min/mm；
(3) heating process: continuous casting billet heats in continuous-type furnace, and 1230 DEG C of maximum heating temperature, total heating time is
13min/mm；
(4) rolling process: two-stage rolling mill practice is used；First stage is austenite recrystallization stage, start rolling temperature 1065
DEG C, finishing temperature is 940 DEG C, and single pass reduction ratio is 30%, and adding up reduction ratio is 50%；Second stage is austenite non-recrystallization
Stage, start rolling temperature are 910 DEG C, and finishing temperature is 850 DEG C, and single pass reduction ratio is 12%, and adding up reduction ratio is 35%；It has rolled
Cheng Hou is cooled to 650 DEG C using cooling by water with the cooling velocity of 12 DEG C/s.
The mechanical property of the present embodiment low yield strength ratio high tenacity resistant to sulfuric acid dew point corrosion sheet metal: yield strength
395MPa, tensile strength 510MPa, yield tensile ratio 0.77, room temperature ballistic work average out to 260J；Corrosion resistance to sulfuric acid dew point: corrosion
Rate is 5.68mg/cm2H is 5.65mg/cm with 09CrCuSb(corrosion rate2H) suitable compared to corrosion rate.
Embodiment 5
The present embodiment low yield strength ratio high tenacity resistant to sulfuric acid dew point corrosion sheet metal is with a thickness of 15mm, chemical component composition and matter
Measure percentage composition are as follows: C:0.14%, Si:0.50%, Mn:0.80%, P:0.008%, S:0.002%, Al:0.020%, Cr:0.65%,
Cu:0.45%, Ca:0.0015%, surplus are Fe and inevitable impurity.
The production method of the present embodiment low yield strength ratio high tenacity resistant to sulfuric acid dew point corrosion sheet metal include smelting, continuous casting,
Heating, rolling process, specific process step are as described below:
(1) smelting procedure: molten steel is first smelted through first furnace, feeding LF refining furnace refining, flows slag with multiple using the quantity of slag is increased, with
Conducive to de- P, the quantity of slag is added in 16.20kg/t steel, slag charge a small amount of more batches, white slag atmosphere retention time 15min, Al in slag2O3Contain
Amount is 20%, and FeO content is 15% in slag, and refining terminates to stay quantity of slag 9.80kg/t steel, the stirring of LF furnace Argon, preceding 15min argon gas stream
Measure 100L/min, rear 10min argon flow 30L/min；Bull ladle VD furnace is vacuum-treated at big 1595 DEG C of temperature of packet, in refining process
The aluminum steel of 1.5kg/t steel and the Si-Ca line of 4.5kg/t steel are first fed into molten steel, add the calcium carbide deoxidation of 1.7kg/t steel
Agent, vacuum degree 60Pa, vacuum retention time 23min when vacuum processing；
(2) continuous casting working procedure: carrying out continuous casting for the molten steel after smelting, and when continuous casting carries out electromagnetic agitation, electromagnetic agitation electric current be 380A,
5Hz, reinforcement solidification end is cold by force, obtains continuous casting billet；10 DEG C of molten steel overheat, drawing speed 1.00min/mm；
(3) heating process: continuous casting billet heats in continuous-type furnace, and 1215 DEG C of maximum heating temperature, total heating time is
12.5min/mm；
(4) rolling process: two-stage rolling mill practice is used；First stage is austenite recrystallization stage, start rolling temperature 1070
DEG C, finishing temperature is 930 DEG C, and single pass reduction ratio is 20%, and adding up reduction ratio is 42%；Second stage is austenite non-recrystallization
Stage, start rolling temperature are 890 DEG C, and finishing temperature is 860 DEG C, and single pass reduction ratio is 10%, and adding up reduction ratio is 30%；It has rolled
Cheng Hou, using air-cooled cooling.
The mechanical property of the present embodiment low yield strength ratio high tenacity resistant to sulfuric acid dew point corrosion sheet metal: yield strength
348MPa, tensile strength 483MPa, yield tensile ratio 0.72, room temperature ballistic work average out to 265J；Corrosion resistance to sulfuric acid dew point: corrosion
Rate is 5.60mg/cm2H is 5.65mg/cm with 09CrCuSb(corrosion rate2H) suitable compared to corrosion rate.
Embodiment 6
The present embodiment low yield strength ratio high tenacity resistant to sulfuric acid dew point corrosion sheet metal is with a thickness of 30mm, chemical component composition and matter
Measure percentage composition are as follows: C:0.13%, Si:0.40%, Mn:0.90%, P:0.005%, S:0.001%, Al:0.030%, Cr:0.85%,
Cu:0.35%, Ca:0.0030%, surplus are Fe and inevitable impurity.
The production method of the present embodiment low yield strength ratio high tenacity resistant to sulfuric acid dew point corrosion sheet metal include smelting, continuous casting,
Heating, rolling process, specific process step are as described below:
(1) smelting procedure: molten steel is first smelted through first furnace, feeding LF refining furnace refining, flows slag with multiple using the quantity of slag is increased, with
Conducive to de- P, 16.20kg/t steel, slag charge a small amount of more batches are added, white slag atmosphere retention time 18min, Al in slag2O3Content be
35%, FeO content is 13% in slag, and refining terminates to stay quantity of slag 10.20kg/t steel, the stirring of LF furnace Argon, preceding 15min argon flow
100L/min, rear 10min argon flow 40L/min；Bull ladle VD furnace is vacuum-treated at 1600 DEG C of temperature of big packet, in refining process to
The aluminum steel of 1.8kg/t steel and the Si-Ca line of 5.5kg/t steel are first fed in molten steel, add the calcium carbide deoxidizer of 1.9kg/t steel,
Vacuum degree 55Pa when vacuum processing, vacuum retention time 27min；
(2) continuous casting working procedure: carrying out continuous casting for the molten steel after smelting, and when continuous casting carries out electromagnetic agitation, electromagnetic agitation electric current be 400A,
5Hz, reinforcement solidification end is cold by force, obtains continuous casting billet；20 DEG C of molten steel overheat, drawing speed 0.80min/mm；
(3) heating process: continuous casting billet heats in continuous-type furnace, and 1225 DEG C of maximum heating temperature, total heating time is
11.5min/mm；
(4) rolling process: two-stage rolling mill practice is used；First stage is austenite recrystallization stage, start rolling temperature 1080
DEG C, finishing temperature is 940 DEG C, and single pass reduction ratio is 15%, and adding up reduction ratio is 40%；Second stage is austenite non-recrystallization
Stage, start rolling temperature are 900 DEG C, and finishing temperature is 840 DEG C, and single pass reduction ratio is 13%, and adding up reduction ratio is 35%；It has rolled
Cheng Hou is cooled to 600 DEG C using cooling by water with the cooling velocity of 15 DEG C/s.
The mechanical property of the present embodiment low yield strength ratio high tenacity resistant to sulfuric acid dew point corrosion sheet metal: yield strength
395MPa, tensile strength 494MPa, yield tensile ratio 0.80, room temperature ballistic work average out to 280J；Corrosion resistance to sulfuric acid dew point: corrosion
Rate is 5.80mg/cm2H is 5.65mg/cm with 09CrCuSb(corrosion rate2H) suitable compared to corrosion rate.
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although referring to above-described embodiment to this hair
It is bright to be described in detail, those skilled in the art should understand that: still the present invention can be modified or be waited
With replacement, without departing from the spirit or scope of the invention, or any substitutions, should all cover in power of the invention
In sharp claimed range.
Claims (10)
1. a kind of low yield strength ratio high tenacity resistant to sulfuric acid dew point corrosion sheet metal, which is characterized in that the sheet metal chemical component
Composition and its mass percentage are as follows: C:0.11~0.14%, Si:0.35~0.50%, Mn:0.80~0.90%, P≤0.008%,
S≤0.002%, Al:0.020~0.040%, Cr:0.65~0.85%, Cu:0.35~0.45%, Ca:0.0015~0.0030%,
Surplus is Fe and inevitable impurity.
2. a kind of low yield strength ratio high tenacity resistant to sulfuric acid dew point corrosion sheet metal according to claim 1, which is characterized in that
The sheet metal is with a thickness of 8~35mm.
3. a kind of low yield strength ratio high tenacity resistant to sulfuric acid dew point corrosion sheet metal according to claim 1, which is characterized in that
The sheet metal mechanical property: yield strength 345MPa~400MPa, tensile strength 480MPa~520MPa, yield tensile ratio 0.72~
0.80, room temperature ballistic work is averaged 250~300J；Corrosion resistance to sulfuric acid dew point: 5.60~5.80mg/cm of corrosion rate2h。
4. based on a kind of low yield strength ratio high tenacity resistant to sulfuric acid dew point corrosion sheet metal described in claim 1-3 any one
Production method, which is characterized in that the production method includes smelting, continuous casting, heating, rolling process；The rolling process uses
Two-stage rolling mill practice, single pass reduction ratio are 10~30%, and adding up reduction ratio is 30~50%, after the completion of rolling, 8mm≤d≤
For 15mm thick steel plate using air-cooled, 15mm < d≤35mm thick steel plate uses water cooling, and wherein d is finished steel plate thickness.
5. a kind of production method of low yield strength ratio high tenacity resistant to sulfuric acid dew point corrosion sheet metal according to claim 4,
It is characterized in that, the rolling process, using two-stage rolling mill practice；First stage is austenite recrystallization stage, open rolling temperature
Degree be 1050~1100 DEG C, finishing temperature be 920~950 DEG C, single pass reduction ratio be 10~30%, add up reduction ratio be 30~
50%。
6. a kind of production method of low yield strength ratio high tenacity resistant to sulfuric acid dew point corrosion sheet metal according to claim 4,
It is characterized in that, the rolling process, second stage is the austenite non-recrystallization stage, and start rolling temperature is 870~910 DEG C, eventually
Rolling temperature is 800~860 DEG C, and single pass reduction ratio is 10~30%, and adding up reduction ratio is 30~50%.
7. a kind of production method of low yield strength ratio high tenacity resistant to sulfuric acid dew point corrosion sheet metal according to claim 4,
It is characterized in that, the rolling process, after the completion of rolling, 8mm≤d≤15mm thick steel plate is using air-cooled；15mm < d≤35mm is thick
Steel plate uses water cooling, is cooled to 600~650 DEG C with the cooling velocity of 10~15 DEG C/s, and wherein d is finished steel plate thickness.
8. a kind of low yield strength ratio high tenacity resistant to sulfuric acid dew point corrosion sheet metal according to claim 4-7 any one
Production method, which is characterized in that the smelting procedure, molten steel are first smelted through first furnace, LF refining furnace refining are sent into, using increase
The quantity of slag and repeatedly stream slag, in favor of taking off P, the quantity of slag is protected in 15.80~16.20kg/t steel, a small amount of more batches of additions of slag charge, white slag atmosphere
Hold the time >=15min, Al in slag2O3Content be 20~35%, FeO content is 10~15% in slag, and refining terminates to stay the quantity of slag 9.80
~10.20kg/t steel, the stirring of LF furnace Argon, preceding 15min argon flow 100~150L/min, rear 10min argon flow 30~
50L/min；Bull ladle VD furnace is vacuum-treated when big packet temperature >=1580 DEG C, first feed 1.5 in refining process into molten steel~
The aluminum steel of 1.8kg/t steel and the Si-Ca line of 4.5~5.5kg/t steel, add the calcium carbide deoxidizer of 1.5~2.0kg/t steel, very
Vacuum degree≤66Pa when vacancy is managed, vacuum retention time >=20min.
9. a kind of low yield strength ratio high tenacity resistant to sulfuric acid dew point corrosion sheet metal according to claim 4-7 any one
Production method, which is characterized in that the heating process, continuous casting billet heat in continuous-type furnace, maximum heating temperature 1210
~1230 DEG C, total heating time >=11min/mm.
10. a kind of low yield strength ratio high tenacity resistant to sulfuric acid dew point corrosion sheet metal according to claim 4-7 any one
Production method, which is characterized in that the molten steel after smelting is carried out continuous casting by the continuous casting working procedure, and when continuous casting carries out electromagnetic agitation,
Electromagnetic agitation electric current is 380~400A, 5Hz, and reinforcement solidification end is cold by force, obtains continuous casting billet；It 10~20 DEG C of molten steel overheat, draws
Base speed is 0.80~1.00min/mm.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110904384A (en) * | 2019-12-02 | 2020-03-24 | 中国石油集团渤海石油装备制造有限公司 | Q345NS spiral submerged arc welded pipe for resisting sulfuric acid dew point corrosion and manufacturing process thereof |
| CN113025925A (en) * | 2021-03-10 | 2021-06-25 | 安阳钢铁股份有限公司 | Production method of nickel-free steel for resisting sulfuric acid dew point corrosion |
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| CN104357754A (en) * | 2014-10-17 | 2015-02-18 | 江阴兴澄特种钢铁有限公司 | Steel plate resistant to sulfuric acid dew point corrosion and manufacturing method for steel plate |
| CN106521332A (en) * | 2016-10-31 | 2017-03-22 | 舞阳钢铁有限责任公司 | Steel plate for resisting hydrogen cracking by stress and production method thereof |
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| CN104357754A (en) * | 2014-10-17 | 2015-02-18 | 江阴兴澄特种钢铁有限公司 | Steel plate resistant to sulfuric acid dew point corrosion and manufacturing method for steel plate |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110904384A (en) * | 2019-12-02 | 2020-03-24 | 中国石油集团渤海石油装备制造有限公司 | Q345NS spiral submerged arc welded pipe for resisting sulfuric acid dew point corrosion and manufacturing process thereof |
| CN110904384B (en) * | 2019-12-02 | 2021-04-06 | 中国石油天然气集团有限公司 | Q345NS spiral submerged arc welded pipe for resisting sulfuric acid dew point corrosion and manufacturing process thereof |
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Application publication date: 20190212 |