CN109881095A - A kind of B grades of acid-resistant pipeline steel plate and smelting process - Google Patents
A kind of B grades of acid-resistant pipeline steel plate and smelting process Download PDFInfo
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Abstract
The invention discloses a kind of B grades of acid-resistant pipeline steel plate and smelting processes, its chemical component and mass percent are as follows: C:0.010%~0.040%, Si:0.10%~0.30%, Mn:0.80%~0.90%, P≤0.015%, S≤0.0010%, Ni:0.10%~0.20%, Cu:0.10%~0.20%, Nb:0.020%~0.040%, Mo:0.08%~0.15%, Ti:0.010%~0.020%, Ca:0.001%~0.003%, Al:0.010%~0.040%, surplus are Fe and inevitable impurity, Ceq:0.16~0.23%, Pcm:0.07~0.13 %.The present invention is developed using a small amount of Nb alloying element, is carried out refund processing using Mo element, is effectively reduced production cost, while meeting the antiacid corrosion resistance requirement of product.
Description
Technical field
The present invention relates to iron and steel smelting technology fields, more particularly to a kind of B grades of acid-resistant pipeline steel plate and smelting process.
Background technique
Due to the supersaturation of steel market, enterprise competitiveness more tends to be white-hot, and conventional variety gross profit is lower and lower, opens
Send out product high-grade into the key of enterprise's survival and development, demand is quite big in the international market for pipeline steel product, antiacid
For pipeline since production difficulty is big, product quality requires harshness, and few enterprises have supply of material qualification, outlet antiacid for B grades
Line is all refunded using Nb always, and Nb is larger to product Microalloying Effect, energy thinning microstructure grain size, to Antacid effectiveness
It is free from side effects, but higher cost.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of B grades of acid-resistant pipeline steel plate, chemical component and quality hundred
Divide ratio as follows: C:0.010%~0.040%, Si:0.10%~0.30%, Mn:0.80%~0.90%, P≤0.015%, S≤
0.0010%, Ni:0.10%~0.20%, Cu:0.10%~0.20%, Nb:0.020%~0.040%, Mo:0.08%~0.15%,
Ti:0.010%~0.020%, Ca:0.001%~0.003%, Al:0.010%~0.040%, surplus be Fe and inevitably it is miscellaneous
Matter, Ceq:0.16~0.23%, Pcm:0.07~0.13%.
Technical effect: the present invention is developed using a small amount of Nb alloying element, carries out refund processing using Mo element, effectively
Production cost is reduced, since molybdenum element easily forms hard phase constitution in rolling cooling procedure, causes poisonous agent H2S and CO2Sun
Pole corrosion, causes Antacid effectiveness unqualified, according to products characteristics, has carried out technological improvement to continuous casting process, obtained flourishing column
Macrostructure based on shape crystalline substance, improves properties of product, while meeting the antiacid corrosion resistance requirement of product, improves product city
Field competitiveness.
The technical solution that the present invention further limits is:
A kind of preceding B grades of acid-resistant pipeline steel plates, chemical component and mass percent are as follows, chemical component and quality hundred
Divide ratio as follows: C:0.010%~0.017%, Si:0.10%~0.20%, Mn:0.80%~0.89%, P≤0.012%, S≤
0.0008%, Ni:0.10%~0.18%, Cu:0.10%~0.15%, Nb:0.030%~0.040%, Mo:0.10%~0.15%, Ti:
0.010%~0.016%, Ca:0.001%~0.002%, Al:0.010%~0.036%, surplus be Fe and inevitable impurity,
Ceq:0.16~0.23%, Pcm:0.07~0.13%.
A kind of preceding B grades of acid-resistant pipeline steel plates, chemical component and mass percent are as follows, chemical component and matter
It is as follows to measure percentage: C:0.020%~0.030%, Si:0.20%~0.30%, Mn:0.80%~0.90%, P≤0.015%, S≤
0.0010%, Ni:0.15%~0.20%, Cu:0.15%~0.20%, Nb:0.025%~0.035%, Mo:0.08%~0.13%, Ti:
0.010%~0.020%, Ca:0.001%~0.003%, Al:0.020%~0.040%, surplus be Fe and inevitable impurity,
Ceq:0.16~0.23%, Pcm:0.07~0.13%.
A kind of preceding B grades of acid-resistant pipeline steel plates, chemical component and mass percent are as follows, chemical component and matter
It is as follows to measure percentage: C:0.030%~0.040%, Si:0.15%~0.25%, Mn:0.80%~0.90%, P≤0.015%, S≤
0.0010%, Ni:0.10%~0.15%, Cu:0.10%~0.15%, Nb:0.020%~0.030%, Mo:0.10%~0.15%, Ti:
0.010%~0.020%, Ca:0.001%~0.003%, Al:0.010%~0.030%%, surplus be Fe and inevitable impurity,
Ceq:0.16~0.23%, Pcm:0.07~0.13%.
A kind of preceding B grades of acid-resistant pipeline steel plates, chemical component and mass percent are as follows, chemical component and matter
It is as follows to measure percentage: C:0.025%~0.035%, Si:0.15%~0.25%, Mn:0.80%~0.90%, P≤0.015%, S≤
0.0010%, Ni:0.12%~0.18%, Cu:0.13%~0.18%, Nb:0.016%~0.026%, Mo:0.08%~0.13%, Ti:
0.010%~0.020%, Ca:0.001%~0.003%, Al:0.015%~0.035%, surplus be Fe and inevitable impurity,
Ceq:0.16~0.23%, Pcm:0.07~0.13%.
A kind of preceding B grades of acid-resistant pipeline steel plates, chemical component and mass percent are as follows, chemical component and matter
It is as follows to measure percentage: C:0.015%~0.035%, Si:0.13%~0.23%, Mn:0.80%~0.90%, P≤0.015%, S≤
0.0010%, Ni:0.13%~0.19%, Cu:0.15%~0.20%, Nb:0.030%~0.040%, Mo:0.10%~0.15%, Ti:
0.010%~0.020%, Ca:0.001%~0.003%, Al:0.020%~0.040%, surplus be Fe and inevitable impurity,
Ceq:0.16~0.23%, Pcm:0.07~0.13%.
Another object of the present invention is to provide a kind of B grades of acid-resistant pipeline steel plate smelting processes, comprising the following steps:
S1, desulfurization process is carried out using KR method, it is ensured that enter furnace molten iron S≤0.002%；
S2, converter use top and bottom complex blowing mode, and 1680 DEG C of blowing end point temperature or more, tap C≤0.04%, and P≤0.013% is adopted
Carry out terminal with sublance and determine oxygen, carry out tapping deoxidization alloying according to oxygen situation is determined, it is ensured that after tapping Oxygen Content in Liquid Steel 100~
200ppm；
Molten steel is hoisted to RH and is vacuum-treated after S3, converter tapping, and decarburization is carried out in the case where vacuum degree≤3.0mbar
Processing carries out microalloying after decarburization, alloying terminates vacuum and keeps 15min, and degassing goes to be mingled with；
LF furnace is arrived after S4, vacuum processing, carries out desulfurization process, alloying operation, when S≤0.0010%, alloy meet regulation
Calcium treatment operation is carried out after it is required that, Calcium treatment uses seamless pure calcium line, 200 meters/furnace of head furnace, other 180 meters/furnaces of heat；
S5, continuous casting process are poured using whole process protection, and the degree of superheat is controlled at 30~40 degree, guarantee Dynamic Light pressure by adjusting pulling rate
Under depressed before seven sections.
Further, step S5, pressure range control is at 3 meters, drafts 10mm.
The beneficial effects of the present invention are:
(1) present invention is more advantageous to slab core tissue using Ultra-low carbon, low-phosphorous, low-sulfur design, reduces segregation element to production
The influence of quality, Ultra-low carbon design effectively reduce hard phase constitution to the adverse effect of product, ensure that low Nb and add Mo
Element meets a possibility that properties of product；
(2) present invention uses the high degree of superheat, shortens dynamic soft-reduction pressure range, improves dynamic soft-reduction drafts, improves
The case where improving macrostructure grading by electromagnetic agitation, has obtained flourishing columanar structure, reduces equiax crystal ratio column,
Uniformly tiny ferritic structure is more readily formed in Cooling Process for Steel Plate Based, hard phase constitution is easier solid solution and bainite transformation,
Bainite structure obtained from based on low temperature ferrite, a small amount of meets product hic resistance, SSC performance requirement, meets
The problem of product strength and toughness matched well；
(3) present invention is designed by reasonable composition, effectively reduces segregation element to HIC, SSC performance adverse effect element
Harm replaces the equiaxed grain structure of fine uniform with flourishing column crystal, favorably improves ferrite pair in rolling cooling procedure
The hardness tissue solid solution effect such as carbon, molybdenum, successfully solves the adverse effect of B grades of antiacid pipeline addition Mo elements, reduces product
Manufacturing cost, improve economic benefit.
Detailed description of the invention
Fig. 1 is 1 macrostructure figure of the embodiment of the present invention.
Specific embodiment
Embodiment 1
A kind of B grades of acid-resistant pipeline steel plates provided in this embodiment, chemical component and mass percent are as follows: C:0.010%~
0.017%, Si:0.10%~0.20%, Mn:0.8%~0.89%, P≤0.012%, S≤0.0008%, Ni:0.10%~0.18%,
Cu:0.10%~0.15%, Nb:0.03%~0.040%, Mo:0.10%~0.15%, Ti:0.01%~0.016%, Ca:0.001%~
0.002%, Al:0.010%~0.036%, surplus be Fe and inevitable impurity, Ceq:0.16~0.23%, Pcm:0.07~
0.13%。
Above-mentioned B grades of acid-resistant pipeline steel plate smelting process, comprising the following steps:
S1, desulfurization process is carried out using KR method, it is ensured that enter furnace molten iron S≤0.002%；
S2, converter use top and bottom complex blowing mode, and 1680 DEG C of blowing end point temperature or more, tap C:0.031%, P:0.009%, use
Sublance carries out terminal and determines oxygen, carries out tapping deoxidization alloying according to oxygen situation is determined, it is ensured that Oxygen Content in Liquid Steel is in 180ppm after tapping；
Molten steel is hoisted to RH and is vacuum-treated after S3, converter tapping, and decarburization is carried out in the case where vacuum degree≤3.0mbar
Processing carries out microalloying after decarburization, alloying terminates vacuum and keeps 15min, and degassing goes to be mingled with；
LF furnace is arrived after S4, vacuum processing, carries out desulfurization process, alloying operation, when S:0.0006%, alloy meet regulation
Calcium treatment operation is carried out after it is required that, Calcium treatment uses seamless pure calcium line, 200 meters/furnace of head furnace, other 180 meters/furnaces of heat；
S5, continuous casting process are poured using whole process protection, and the degree of superheat is controlled at 36 degree, guarantee that dynamic soft-reduction exists by adjusting pulling rate
It is depressed before seven sections, pressure range is controlled at 3 meters, drafts 10mm, shortens pressure range, improves drafts.
Embodiment 2
A kind of B grades of acid-resistant pipeline steel plates provided in this embodiment, the difference from embodiment 1 is that, chemical component and quality hundred
Point ratio is as follows: C:0.020%~0.030%, Si:0.20%~0.30%, Mn:0.8%~0.9%, P≤0.015%, S≤0.0010%,
Ni:0.15%~0.20%, Cu:0.15%~0.20%, Nb:0.025%~0.035%, Mo:0.08%~0.13%, Ti:0.01%~
0.02%, Ca:0.001%~0.003%, Al:0.02%~0.04%, surplus be Fe and inevitable impurity, Ceq:0.16~
0.23%, Pcm:0.07~0.13%.
Embodiment 3
A kind of B grades of acid-resistant pipeline steel plates provided in this embodiment, chemical component and mass percent are as follows: C:0.030%~
0.040%, Si:0.15%~0.25%, Mn:0.8%~0.9%, P≤0.015%, S≤0.0010%, Ni:0.10%~0.15%, Cu:
0.10%~0.15%, Nb:0.020%~0.030%, Mo:0.10%~0.15%, Ti:0.01%~0.02%, Ca:0.001%~
0.003%, Al:0.01%~0.03%, surplus be Fe and inevitable impurity, Ceq:0.16~0.23%, Pcm:0.07~
0.13%。
Above-mentioned B grades of acid-resistant pipeline steel plate smelting process, comprising the following steps:
S1, desulfurization process is carried out using KR method, it is ensured that enter furnace molten iron S≤0.002%；
S2, converter use top and bottom complex blowing mode, and 1680 DEG C of blowing end point temperature or more, tap C:0.038%, P:0.011%, use
Sublance carries out terminal and determines oxygen, carries out tapping deoxidization alloying according to oxygen situation is determined, it is ensured that Oxygen Content in Liquid Steel is in 160ppm after tapping；
Molten steel is hoisted to RH and is vacuum-treated after S3, converter tapping, and decarburization is carried out in the case where vacuum degree≤3.0mbar
Processing carries out microalloying after decarburization, alloying terminates vacuum and keeps 15min, and degassing goes to be mingled with；
LF furnace is arrived after S4, vacuum processing, carries out desulfurization process, alloying operation, when S≤0.0010%, alloy meet regulation
Calcium treatment operation is carried out after it is required that, Calcium treatment uses seamless pure calcium line, 200 meters/furnace of head furnace, other 180 meters/furnaces of heat；
S5, continuous casting process are poured using whole process protection, and the degree of superheat is controlled at 33 degree, guarantee that dynamic soft-reduction exists by adjusting pulling rate
It is depressed before seven sections, pressure range is controlled at 3 meters, drafts 10mm, shortens pressure range, improves drafts.
Embodiment 4
A kind of B grades of acid-resistant pipeline steel plates provided in this embodiment, the difference with embodiment 3 be, chemical component and quality hundred
Point ratio is as follows: C:0.025%~0.035%, Si:0.15%~0.25%, Mn:0.8%~0.9%, P≤0.015%, S≤0.0010%,
Ni:0.12%~0.18%, Cu:0.13%~0.18%, Nb:0.016%~0.026%, Mo:0.08%~0.13%, Ti:0.01%~
0.02%, Ca:0.001%~0.003%, Al:0.015%~0.035%, surplus be Fe and inevitable impurity, Ceq:0.16~
0.23%, Pcm:0.07~0.13%.
Embodiment 5
A kind of B grades of acid-resistant pipeline steel plates provided in this embodiment, chemical component and mass percent are as follows: C:0.015%~
0.035%, Si:0.13%~0.23%, Mn:0.8%~0.9%, P≤0.015%, S≤0.0010%, Ni:0.13%~0.19%, Cu:
0.15%~0.20%, Nb:0.030%~0.040%, Mo:0.10%~0.15%, Ti:0.01%~0.02%, Ca:0.001%~
0.003%, Al:0.02%~0.04%, surplus be Fe and inevitable impurity, Ceq:0.16~0.23%, Pcm:0.07~
0.13%。
Above-mentioned B grades of acid-resistant pipeline steel plate smelting process, comprising the following steps:
S1, desulfurization process is carried out using KR method, it is ensured that enter furnace molten iron S≤0.002%；
S2, converter use top and bottom complex blowing mode, and 1680 DEG C of blowing end point temperature or more, tap C:0.035%, and P≤0.0010% is adopted
Terminal is carried out with sublance and determines oxygen, carries out tapping deoxidization alloying according to oxygen situation is determined, it is ensured that Oxygen Content in Liquid Steel exists after tapping
170ppm；
Molten steel is hoisted to RH and is vacuum-treated after S3, converter tapping, and decarburization is carried out in the case where vacuum degree≤3.0mbar
Processing carries out microalloying after decarburization, alloying terminates vacuum and keeps 15min, and degassing goes to be mingled with；
LF furnace is arrived after S4, vacuum processing, carries out desulfurization process, alloying operation, when S≤0.0010%, alloy meet regulation
Calcium treatment operation is carried out after it is required that, Calcium treatment uses seamless pure calcium line, 200 meters/furnace of head furnace, other 180 meters/furnaces of heat；
S5, continuous casting process are poured using whole process protection, and the degree of superheat is controlled at 39 degree, guarantee that dynamic soft-reduction exists by adjusting pulling rate
It is depressed before seven sections, pressure range is controlled at 3 meters, drafts 10mm, shortens pressure range, improves drafts.
Embodiment 1 obtains the macrostructure of Fig. 1, and as seen from the figure, B grades of acid-resistant pipeline steel even tissues are tiny, and tissue is main
Contain a small amount of bainite structure simultaneously based on ferritic structure, grain size is graded 10 grades.
The present invention proposes a kind of smelting process of B grades of acid-resistant pipeline steel, by the high degree of superheat of continuous casting, shortens dynamic soft-reduction
Pressure range, solidification end are depressed using heavy reduction, are effectively improved low power centre tissue, are got rid of by electricity
Magnetic stirring improves the history of slab macrostructure, and coarse columanar structure is more conducive to than tiny equiaxed grain structure to segregation member
The solid solution of element, alleviates poisonous agent H2S and CO2To the hard phase constitution corrosion rate of center portion, solves Mo element to the unfavorable shadow of product
It rings, to reach the B grades of antiacid antiacid corrosion resistant performance requirements of pipeline.
In addition to the implementation, the present invention can also have other embodiments.It is all to use equivalent substitution or equivalent transformation shape
At technical solution, fall within the scope of protection required by the present invention.
Claims (8)
1. a kind of B grades of acid-resistant pipeline steel plate, which is characterized in that its chemical component and mass percent are as follows: C:0.010%~
0.040%, Si:0.10%~0.30%, Mn:0.80%~0.90%, P≤0.015%, S≤0.0010%, Ni:0.10%~0.20%,
Cu:0.10%~0.20%, Nb:0.020%~0.040%, Mo:0.08%~0.15%, Ti:0.010%~0.020%, Ca:
0.001%~0.003%, Al:0.010%~0.040%, surplus be Fe and inevitable impurity, Ceq:0.16~0.23%,
Pcm:0.07~0.13%.
2. a kind of B grades of acid-resistant pipeline steel plates according to claim 1, which is characterized in that its chemical component and quality percentage
Than as follows: C:0.010%~0.017%, Si:0.10%~0.20%, Mn:0.80%~0.89%, P≤0.012%, S≤0.0008%,
Ni:0.10%~0.18%, Cu:0.10%~0.15%, Nb:0.030%~0.040%, Mo:0.10%~0.15%, Ti:0.010%~
0.016%, Ca:0.001%~0.002%, Al:0.010%~0.036%, surplus are Fe and inevitable impurity, Ceq:0.16
~0.23%, Pcm:0.07~0.13%.
3. a kind of B grades of acid-resistant pipeline steel plates according to claim 1, which is characterized in that its chemical component and quality percentage
Than as follows: C:0.020%~0.030%, Si:0.20%~0.30%, Mn:0.80%~0.90%, P≤0.015%, S≤0.0010%,
Ni:0.15%~0.20%, Cu:0.15%~0.20%, Nb:0.025%~0.035%, Mo:0.08%~0.13%, Ti:0.010%~
0.020%, Ca:0.001%~0.003%, Al:0.020%~0.040%, surplus are Fe and inevitable impurity, Ceq:0.16
~0.23%, Pcm:0.07~0.13%.
4. a kind of B grades of acid-resistant pipeline steel plates according to claim 1, which is characterized in that its chemical component and quality percentage
Than as follows: C:0.030%~0.040%, Si:0.15%~0.25%, Mn:0.80%~0.90%, P≤0.015%, S≤0.0010%,
Ni:0.10%~0.15%, Cu:0.10%~0.15%, Nb:0.020%~0.030%, Mo:0.10%~0.15%, Ti:0.010%~
0.020%, Ca:0.001%~0.003%, Al:0.010%~0.030%%, surplus are Fe and inevitable impurity, Ceq:0.16
~0.23%, Pcm:0.07~0.13%.
5. a kind of B grades of acid-resistant pipeline steel plates according to claim 1, which is characterized in that its chemical component and quality percentage
Than as follows: C:0.025%~0.035%, Si:0.15%~0.25%, Mn:0.80%~0.90%, P≤0.015%, S≤0.0010%,
Ni:0.12%~0.18%, Cu:0.13%~0.18%, Nb:0.016%~0.026%, Mo:0.08%~0.13%, Ti:0.010%~
0.020%, Ca:0.001%~0.003%, Al:0.015%~0.035%, surplus are Fe and inevitable impurity, Ceq:0.16
~0.23%, Pcm:0.07~0.13%.
6. a kind of B grades of acid-resistant pipeline steel plates according to claim 1, which is characterized in that its chemical component and quality percentage
Than as follows: C:0.015%~0.035%, Si:0.13%~0.23%, Mn:0.80%~0.90%, P≤0.015%, S≤0.0010%,
Ni:0.13%~0.19%, Cu:0.15%~0.20%, Nb:0.030%~0.040%, Mo:0.10%~0.15%, Ti:0.010%~
0.020%, Ca:0.001%~0.003%, Al:0.020%~0.040%, surplus are Fe and inevitable impurity, Ceq:0.16
~0.23%, Pcm:0.07~0.13%.
7. a kind of B grades of acid-resistant pipeline steel plate smelting process, which comprises the following steps:
S1, desulfurization process is carried out using KR method, it is ensured that enter furnace molten iron S≤0.002%；
S2, converter use top and bottom complex blowing mode, and 1680 DEG C of blowing end point temperature or more, tap C≤0.04%, and P≤0.013% is adopted
Carry out terminal with sublance and determine oxygen, carry out tapping deoxidization alloying according to oxygen situation is determined, it is ensured that after tapping Oxygen Content in Liquid Steel 100~
200ppm；
Molten steel is hoisted to RH and is vacuum-treated after S3, converter tapping, and decarburization is carried out in the case where vacuum degree≤3.0mbar
Processing carries out microalloying after decarburization, alloying terminates vacuum and keeps 15min, and degassing goes to be mingled with；
LF furnace is arrived after S4, vacuum processing, carries out desulfurization process, alloying operation, when S≤0.0010%, alloy meet regulation
Calcium treatment operation is carried out after it is required that, Calcium treatment uses seamless pure calcium line, 200 meters/furnace of head furnace, other 180 meters/furnaces of heat；
S5, continuous casting process are poured using whole process protection, and the degree of superheat is controlled at 30~40 degree, guarantee Dynamic Light pressure by adjusting pulling rate
Under depressed before seven sections.
8. a kind of B grades of acid-resistant pipeline steel plates according to claim 7 and smelting process, it is characterised in that: the step S5,
Pressure range control is at 3 meters, drafts 10mm.
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Cited By (4)
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| CN109811263A (en) * | 2019-03-14 | 2019-05-28 | 南京钢铁股份有限公司 | A kind of B grades of acid-resistant pipeline steel plate and production technology |
| CN109913753A (en) * | 2019-03-14 | 2019-06-21 | 南京钢铁股份有限公司 | A kind of B grades of acid-resistant pipeline steel plate and rolling mill practice |
| CN110295320A (en) * | 2019-06-20 | 2019-10-01 | 江阴兴澄特种钢铁有限公司 | A kind of big wall thickness X52MS acid-resistant pipeline steel plate and its manufacturing method of the production of LF-RH refinery practice |
| CN111440999A (en) * | 2020-05-07 | 2020-07-24 | 南京钢铁股份有限公司 | Production method for improving micro segregation of acid-resistant pipeline |
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| CN109913753A (en) * | 2019-03-14 | 2019-06-21 | 南京钢铁股份有限公司 | A kind of B grades of acid-resistant pipeline steel plate and rolling mill practice |
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