CN104694836B - A kind of antiacid steel plate for structural steelwork - Google Patents
A kind of antiacid steel plate for structural steelwork Download PDFInfo
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- CN104694836B CN104694836B CN201510126225.6A CN201510126225A CN104694836B CN 104694836 B CN104694836 B CN 104694836B CN 201510126225 A CN201510126225 A CN 201510126225A CN 104694836 B CN104694836 B CN 104694836B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 117
- 239000010959 steel Substances 0.000 title claims abstract description 117
- 230000001458 anti-acid effect Effects 0.000 title claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims abstract description 23
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 238000005516 engineering process Methods 0.000 claims abstract description 9
- 238000005096 rolling process Methods 0.000 claims abstract description 9
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 8
- 229910052802 copper Inorganic materials 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 8
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 8
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 8
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 8
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 8
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 8
- 238000005496 tempering Methods 0.000 claims abstract description 8
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 43
- 229910000859 α-Fe Inorganic materials 0.000 claims description 24
- 229910001562 pearlite Inorganic materials 0.000 claims description 23
- 230000006835 compression Effects 0.000 claims description 14
- 238000007906 compression Methods 0.000 claims description 14
- 239000013078 crystal Substances 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 14
- 238000010791 quenching Methods 0.000 claims description 14
- 230000000171 quenching effect Effects 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 10
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical class [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 abstract description 4
- 229940069428 antacid Drugs 0.000 abstract description 4
- 239000003159 antacid agent Substances 0.000 abstract description 4
- 238000010276 construction Methods 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The present invention is a kind of antiacid steel plate for structural steelwork, its composition and mass percent be: C:0.27-0.29%, Mn:0.35-0.37%, Si:0.17-0.19%, P:0.006-0.008%, S:0.002-0.005%, Nb:0.03-0.05%, V:0.04-0.06%, Ti:0.15-0.17%, Al:0.018-0.019%, N≤0.006%, H≤0.00020%, Cu:0.022-0.024%, Ni:1.65-1.67%, Cr:0.54-0.56%, Mo:0.13-0.15%, surplus is Fe and inevitable impurity；Adopt the Technology for Heating Processing of normalizing-secondary normalizing-tempering to carry out heat treatment after this steel plate rolling and there is good obdurability and Antacid effectiveness.
Description
Technical field
The present invention relates to a kind of steel plate, specifically a kind of antiacid steel plate for structural steelwork.
Background technology
Structural steelwork is to be made as main structure with steel, is one of main building construction types, and steel construction is one of version more common in modern construction engineering.Steel construction adopts with the present a lot of enterprise in building industry, but the steel construction that major part is in order to optimize structure, economize on resources, recycle, just implement in novel building industry, but also bringing a lot of defect and potential safety hazard in steel-structure factory building, in steel construction enterprise, most corporate bosses heavily promote steel construction advantage and ignore defect and safe hidden danger.The particularly antiacid problem of steel plate used by structural steelwork, owing to great majority do not have acid-resisting for the steel plate of steel construction, usually can corrode steel plate, causes that structural steelwork is just damaged at short notice, adds building cost.Therefore how being effectively improved the antiacid plate property for structural steelwork is that those skilled in the art have always a demand for solving the technical problem that.
Summary of the invention
The technical problem to be solved is, the shortcoming overcoming prior art, it is provided that a kind of antiacid steel plate for structural steelwork, makes steel plate have good obdurability and Antacid effectiveness.
This invention address that the technical scheme of above technical problem is:
nullA kind of antiacid steel plate for structural steelwork，This steel plate thickness is more than 40mm，The composition of this steel plate and mass percent be: C:0.27-0.29%、Mn:0.35-0.37%、Si:0.17-0.19%、P:0.006-0.008%、S:0.002-0.005%、Nb:0.03-0.05%、V:0.04-0.06%、Ti:0.15-0.17%、Al:0.018-0.019%、N≤0.006%、H≤0.00020%，Cu:0.022-0.024%，Ni:1.65-1.67%，Cr:0.54-0.56%，Mo:0.13-0.15%，Surplus is Fe and inevitable impurity；
Adopting the Technology for Heating Processing of normalizing-secondary normalizing-tempering to carry out heat treatment after this steel plate rolling, described normalizing temperature is 930-950 DEG C, adopts the first refrigerating work procedure to be cooled to room temperature；Described secondary normalizing temperature is 760-780 DEG C, adopts the second refrigerating work procedure to be cooled to room temperature；Described temperature is 640-660 DEG C, adopts the 3rd refrigerating work procedure to be cooled to room temperature；
Wherein, first refrigerating work procedure: first adopt water-cooled, with the cooldown rate of 12-15 DEG C/s, steel is cooled to 720-750 DEG C, then air cooling is to 650-670 DEG C, adopt compression air or vaporific quenching liquid, with the cooldown rate of 9-11 DEG C/s, steel is cooled to 420-440 DEG C again, finally adopt the air-cooled cooldown rate with 4-6 DEG C/s that steel is cooled to room temperature；Second refrigerating work procedure: first adopt water-cooled, with the cooldown rate of 11-13 DEG C/s, steel is cooled to 620-640 DEG C, so adopt the air-cooled cooldown rate with 4-6 DEG C/s that steel is cooled to 490-510 DEG C, then adopt water-cooled, with the cooldown rate of 7-9 DEG C/s, steel is cooled to room temperature；3rd refrigerating work procedure: first adopt the air-cooled cooldown rate with 5-7 DEG C/s that steel is cooled to 510-530 DEG C, adopt water-cooled, with the cooldown rate of 11-13 DEG C/s, steel is cooled to 370-390 DEG C again, finally adopt compression air or vaporific quenching liquid, with the cooldown rate of 7-9 DEG C/s, steel is cooled to room temperature；
Making first-phase in this steel plate be ferrite by above heat treatment, second-phase is pearlite, is 11.5-11.7% on surface to 1/4 thickness place second-phase percentage by volume, and 1/4 thickness is 3.5-3.7% to center second-phase percentage by volume, and without banded structure；Being 4.5-4.7 μm on surface to 1/4 thickness place ferrite average crystal grain diameter, pearlite colony average diameter is 5.0-5.3 μm, and 1/4 thickness is 4.0-4.3 μm to center ferrite average crystal grain diameter, and pearlite colony average diameter is 6.0-6.3 μm.
The invention has the beneficial effects as follows:
The effect that the present invention is limited by composition and heat treated restriction is played is: thick steel plates differs greatly in operation of rolling light plate Deformation in thickness amount, in cooling procedure, the rate of cooling along plate thickness differs greatly, thus causing changing greatly along the Ferrite Grain Size of thickness x cross sectional, volume fraction, easily form banded structure in central area；Owing to surface of steel plate deformation is higher than heart portion, and cooling rate is higher than heart portion, and Ferrite Grain Size is gradually increased to center by surface, and pearlite volume fraction is gradually increased by centripetal portion, surface；The present invention is limited by composition and heat treated restriction, obtain the pearlite of reasonably biphase when fine ferrite and Dispersed precipitate, avoid the formation of banded structure, occur without banded structure, improve Antacid effectiveness, thickness directional properties and low-temperature flexibility, thus reaching to control to be effectively improved the purpose of steel plate Antacid effectiveness by microstructure.
Detailed description of the invention
Below in conjunction with specific embodiment, technical scheme is described in further detail, but protection scope of the present invention is not limited thereto.
Embodiment 1
The present embodiment is a kind of antiacid steel plate for structural steelwork, the composition of this steel plate and mass percent be: C:0.27%, Mn:0.35%, Si:0.17%, P:0.006%, S:0.002%, Nb:0.03%, V:0.04%, Ti:0.15%, Al:0.018%, N:0.006%, H:0.00020%, Cu:0.022%, Ni:1.65%, Cr:0.54%, Mo:0.13%, surplus is Fe and inevitable impurity；
Adopting the Technology for Heating Processing of normalizing-secondary normalizing-tempering to carry out heat treatment after this steel plate rolling, described normalizing temperature is 930 DEG C, adopts the first refrigerating work procedure to be cooled to room temperature；Described secondary normalizing temperature is 760 DEG C, adopts the second refrigerating work procedure to be cooled to room temperature；Described temperature is 640 DEG C, adopts the 3rd refrigerating work procedure to be cooled to room temperature；
Wherein the first refrigerating work procedure: first adopt water-cooled, with the cooldown rate of 12 DEG C/s, steel is cooled to 720 DEG C, then air cooling is to 650 DEG C, adopt compression air or vaporific quenching liquid, with the cooldown rate of 9 DEG C/s, steel is cooled to 420 DEG C again, finally adopt the air-cooled cooldown rate with 4 DEG C/s that steel is cooled to room temperature；Second refrigerating work procedure: first adopt water-cooled, with the cooldown rate of 11 DEG C/s, steel is cooled to 620 DEG C, so adopt the air-cooled cooldown rate with 4 DEG C/s that steel is cooled to 490 DEG C, then adopt water-cooled, with the cooldown rate of 7 DEG C/s, steel is cooled to room temperature；3rd refrigerating work procedure: first adopt the air-cooled cooldown rate with 5 DEG C/s that steel is cooled to 510 DEG C, adopt water-cooled, with the cooldown rate of 11 DEG C/s, steel is cooled to 370 DEG C again, finally adopt compression air or vaporific quenching liquid, with the cooldown rate of 7 DEG C/s, steel is cooled to room temperature；
Making first-phase in this steel plate be ferrite by above heat treatment, second-phase is pearlite, is 11.5% on surface to 1/4 thickness place second-phase percentage by volume, and 1/4 thickness is 3.5% to center second-phase percentage by volume, and without banded structure；Being 4.5 μm on surface to 1/4 thickness place ferrite average crystal grain diameter, pearlite colony average diameter is 5.0 μm, and 1/4 thickness is 4.0 μm to center ferrite average crystal grain diameter, and pearlite colony average diameter is 6.0 μm.
Embodiment 2
The present embodiment is a kind of antiacid steel plate for structural steelwork, the composition of this steel plate and mass percent be: C:0.28%, Mn:0.36%, Si:0.18%, P:0.007%, S:0.003%, Nb:0.04%, V:0.05%, Ti:0.16%, Al:0.019%, N:0.002%, H:0.0001%, Cu:0.023%, Ni:1.667%, Cr:0.55%, Mo:0.14%, surplus is Fe and inevitable impurity；
Adopting the Technology for Heating Processing of normalizing-secondary normalizing-tempering to carry out heat treatment after this steel plate rolling, described normalizing temperature is 940 DEG C, adopts the first refrigerating work procedure to be cooled to room temperature；Described secondary normalizing temperature is 770 DEG C, adopts the second refrigerating work procedure to be cooled to room temperature；Described temperature is 650 DEG C, adopts the 3rd refrigerating work procedure to be cooled to room temperature；
Wherein, first refrigerating work procedure: first adopt water-cooled, with the cooldown rate of 13 DEG C/s, steel is cooled to 730 DEG C, then air cooling is to 660 DEG C, adopt compression air or vaporific quenching liquid, with the cooldown rate of 101 DEG C/s, steel is cooled to 430 DEG C again, finally adopt the air-cooled cooldown rate with 5 DEG C/s that steel is cooled to room temperature；Second refrigerating work procedure: first adopt water-cooled, with the cooldown rate of 12 DEG C/s, steel is cooled to 630 DEG C, so adopt the air-cooled cooldown rate with 5 DEG C/s that steel is cooled to 5000 DEG C, then adopt water-cooled, with the cooldown rate of 8 DEG C/s, steel is cooled to room temperature；3rd refrigerating work procedure: first adopt the air-cooled cooldown rate with 6 DEG C/s that steel is cooled to 520 DEG C, adopt water-cooled, with the cooldown rate of 12 DEG C/s, steel is cooled to 380 DEG C again, finally adopt compression air or vaporific quenching liquid, with the cooldown rate of 8 DEG C/s, steel is cooled to room temperature；
Making first-phase in this steel plate be ferrite by above heat treatment, second-phase is pearlite, is 11.67% on surface to 1/4 thickness place second-phase percentage by volume, and 1/4 thickness is 3.6% to center second-phase percentage by volume, and without banded structure；Being 4.6 μm on surface to 1/4 thickness place ferrite average crystal grain diameter, pearlite colony average diameter is 5.2 μm, and 1/4 thickness is 4.2 μm to center ferrite average crystal grain diameter, and pearlite colony average diameter is 6.2 μm.
Embodiment 3
The present embodiment is a kind of antiacid steel plate for structural steelwork, the composition of this steel plate and mass percent be: C:0.29%, Mn:0.37%, Si:0.19%, P:0.008%, S:0.005%, Nb:0.05%, V:0.06%, Ti:0.17%, Al:0.19%, N:0.001%, H:0.0001%, Cu:0.024%, Ni:1.67%, Cr:0.56%, Mo:0.15%, surplus is Fe and inevitable impurity；
Adopting the Technology for Heating Processing of normalizing-secondary normalizing-tempering to carry out heat treatment after this steel plate rolling, described normalizing temperature is 950 DEG C, adopts the first refrigerating work procedure to be cooled to room temperature；Described secondary normalizing temperature is 780 DEG C, adopts the second refrigerating work procedure to be cooled to room temperature；Described temperature is 660 DEG C, adopts the 3rd refrigerating work procedure to be cooled to room temperature；
Wherein, first refrigerating work procedure: first adopt water-cooled, with the cooldown rate of 15 DEG C/s, steel is cooled to 750 DEG C, then air cooling is to 670 DEG C, adopt compression air or vaporific quenching liquid, with the cooldown rate of 11 DEG C/s, steel is cooled to 440 DEG C again, finally adopt the air-cooled cooldown rate with 6 DEG C/s that steel is cooled to room temperature；Second refrigerating work procedure: first adopt water-cooled, with the cooldown rate of 13 DEG C/s, steel is cooled to 640 DEG C, so adopt the air-cooled cooldown rate with 6 DEG C/s that steel is cooled to 510 DEG C, then adopt water-cooled, with the cooldown rate of 9 DEG C/s, steel is cooled to room temperature；3rd refrigerating work procedure: first adopt the air-cooled cooldown rate with 7 DEG C/s that steel is cooled to 530 DEG C, adopt water-cooled, with the cooldown rate of 13 DEG C/s, steel is cooled to 390 DEG C again, finally adopt compression air or vaporific quenching liquid, with the cooldown rate of 9 DEG C/s, steel is cooled to room temperature；
Making first-phase in this steel plate be ferrite by above heat treatment, second-phase is pearlite, is 11.7% on surface to 1/4 thickness place second-phase percentage by volume, and 1/4 thickness is 3.7% to center second-phase percentage by volume, and without banded structure；Being 4.7 μm on surface to 1/4 thickness place ferrite average crystal grain diameter, pearlite colony average diameter is 5.3 μm, and 1/4 thickness is 4.3 μm to center ferrite average crystal grain diameter, and pearlite colony average diameter is 6.3 μm.
The performance of each embodiment steel plate is as shown in table 1.
The performance of each embodiment steel plate of table 1
| Embodiment | Tensile strength, MPa | Yield strength, MPa | Elongation percentage, % | The thickness direction contraction percentage of area, % | -20 DEG C of Charpy-V impact powers, J | CLR, % | CTR, % | CSR,% | SSC |
| Embodiment 1 | 455 | 314 | 33 | 60.5 | 230 | 0 | 0 | 0 | Flawless |
| Embodiment 2 | 457 | 322 | 36 | 63.7 | 245 | 0 | 0 | 0 | Flawless |
| Embodiment 3 | 482 | 335 | 39.5 | 70.0 | 255 | 0 | 0 | 0 | Flawless |
As seen from the above table, the steel of the present invention has good intensity, plasticity and low-temperature flexibility, Properties of HIC resistance and anti-SSC performance.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to replacement or the technical scheme of equivalent transformation formation, all fall within the protection domain of application claims.
Claims (3)
- null1. the antiacid steel plate for structural steelwork，This steel plate thickness is more than 40mm，It is characterized in that: the composition of this steel plate and mass percent be: C:0.27-0.29%、Mn:0.35-0.37%、Si:0.17-0.19%、P:0.006-0.008%、S:0.002-0.005%、Nb:0.03-0.05%、V:0.04-0.06%、Ti:0.15-0.17%、Al:0.018-0.019%、N≤0.006%、H≤0.00020%，Cu:0.022-0.024%，Ni:1.65-1.67%，Cr:0.54-0.56%，Mo:0.13-0.15%，Surplus is Fe and inevitable impurity；Adopting the Technology for Heating Processing of normalizing-secondary normalizing-tempering to carry out heat treatment after this steel plate rolling, described normalizing temperature is 930-950 DEG C, adopts the first refrigerating work procedure to be cooled to room temperature；Described secondary normalizing temperature is 760-780 DEG C, adopts the second refrigerating work procedure to be cooled to room temperature；Described temperature is 640-660 DEG C, adopts the 3rd refrigerating work procedure to be cooled to room temperature；Described first refrigerating work procedure: first adopt water-cooled, with the cooldown rate of 12-15 DEG C/s, steel is cooled to 720-750 DEG C, then air cooling is to 650-670 DEG C, adopt compression air or vaporific quenching liquid, with the cooldown rate of 9-11 DEG C/s, steel is cooled to 420-440 DEG C again, finally adopt the air-cooled cooldown rate with 4-6 DEG C/s that steel is cooled to room temperature；Described second refrigerating work procedure: first adopt water-cooled, with the cooldown rate of 11-13 DEG C/s, steel is cooled to 620-640 DEG C, so adopt the air-cooled cooldown rate with 4-6 DEG C/s that steel is cooled to 490-510 DEG C, then adopt water-cooled, with the cooldown rate of 7-9 DEG C/s, steel is cooled to room temperature；Described 3rd refrigerating work procedure: first adopt the air-cooled cooldown rate with 5-7 DEG C/s that steel is cooled to 510-530 DEG C, adopt water-cooled, with the cooldown rate of 11-13 DEG C/s, steel is cooled to 370-390 DEG C again, finally adopt compression air or vaporific quenching liquid, with the cooldown rate of 7-9 DEG C/s, steel is cooled to room temperature；Making first-phase in this steel plate be ferrite by above heat treatment, second-phase is pearlite, is 11.5-11.7% on surface to 1/4 thickness place second-phase percentage by volume, and 1/4 thickness is 3.5-3.7% to center second-phase percentage by volume, and without banded structure；Being 4.5-4.7 μm on surface to 1/4 thickness place ferrite average crystal grain diameter, pearlite colony average diameter is 5.0-5.3 μm, and 1/4 thickness is 4.0-4.3 μm to center ferrite average crystal grain diameter, and pearlite colony average diameter is 6.0-6.3 μm.
- 2. the antiacid steel plate for structural steelwork as claimed in claim 1, it is characterized in that: the composition of this steel plate and mass percent be: C:0.27%, Mn:0.35%, Si:0.17%, P:0.006%, S:0.002%, Nb:0.03%, V:0.04%, Ti:0.15%, Al:0.018%, N:0.006%, H:0.00020%, Cu:0.022%, Ni:1.65%, Cr:0.54%, Mo:0.13%, surplus is Fe and inevitable impurity；Adopting the Technology for Heating Processing of normalizing-secondary normalizing-tempering to carry out heat treatment after this steel plate rolling, described normalizing temperature is 930 DEG C, adopts the first refrigerating work procedure to be cooled to room temperature；Described secondary normalizing temperature is 760 DEG C, adopts the second refrigerating work procedure to be cooled to room temperature；Described temperature is 640 DEG C, adopts the 3rd refrigerating work procedure to be cooled to room temperature；Described first refrigerating work procedure: first adopt water-cooled, with the cooldown rate of 12 DEG C/s, steel is cooled to 720 DEG C, then air cooling is to 650 DEG C, adopt compression air or vaporific quenching liquid, with the cooldown rate of 9 DEG C/s, steel is cooled to 420 DEG C again, finally adopt the air-cooled cooldown rate with 4 DEG C/s that steel is cooled to room temperature；Described second refrigerating work procedure: first adopt water-cooled, with the cooldown rate of 11 DEG C/s, steel is cooled to 620 DEG C, so adopt the air-cooled cooldown rate with 4 DEG C/s that steel is cooled to 490 DEG C, then adopt water-cooled, with the cooldown rate of 7 DEG C/s, steel is cooled to room temperature；Described 3rd refrigerating work procedure: first adopt the air-cooled cooldown rate with 5 DEG C/s that steel is cooled to 510 DEG C, adopt water-cooled, with the cooldown rate of 11 DEG C/s, steel is cooled to 370 DEG C again, finally adopt compression air or vaporific quenching liquid, with the cooldown rate of 7 DEG C/s, steel is cooled to room temperature；Making first-phase in this steel plate be ferrite by above heat treatment, second-phase is pearlite, is 11.5% on surface to 1/4 thickness place second-phase percentage by volume, and 1/4 thickness is 3.5% to center second-phase percentage by volume, and without banded structure；Being 4.5 μm on surface to 1/4 thickness place ferrite average crystal grain diameter, pearlite colony average diameter is 5.0 μm, and 1/4 thickness is 4.0 μm to center ferrite average crystal grain diameter, and pearlite colony average diameter is 6.0 μm.
- 3. the antiacid steel plate for structural steelwork as claimed in claim 1, it is characterized in that: the composition of this steel plate and mass percent be: C:0.29%, Mn:0.37%, Si:0.19%, P:0.008%, S:0.005%, Nb:0.05%, V:0.06%, Ti:0.17%, Al:0.19%, N:0.001%, H:0.0001%, Cu:0.024%, Ni:1.67%, Cr:0.56%, Mo:0.15%, surplus is Fe and inevitable impurity；Adopting the Technology for Heating Processing of normalizing-secondary normalizing-tempering to carry out heat treatment after this steel plate rolling, described normalizing temperature is 950 DEG C, adopts the first refrigerating work procedure to be cooled to room temperature；Described secondary normalizing temperature is 780 DEG C, adopts the second refrigerating work procedure to be cooled to room temperature；Described temperature is 660 DEG C, adopts the 3rd refrigerating work procedure to be cooled to room temperature；Described first refrigerating work procedure: first adopt water-cooled, with the cooldown rate of 15 DEG C/s, steel is cooled to 750 DEG C, then air cooling is to 670 DEG C, adopt compression air or vaporific quenching liquid, with the cooldown rate of 11 DEG C/s, steel is cooled to 440 DEG C again, finally adopt the air-cooled cooldown rate with 6 DEG C/s that steel is cooled to room temperature；Described second refrigerating work procedure: first adopt water-cooled, with the cooldown rate of 13 DEG C/s, steel is cooled to 640 DEG C, so adopt the air-cooled cooldown rate with 6 DEG C/s that steel is cooled to 510 DEG C, then adopt water-cooled, with the cooldown rate of 9 DEG C/s, steel is cooled to room temperature；Described 3rd refrigerating work procedure: first adopt the air-cooled cooldown rate with 7 DEG C/s that steel is cooled to 530 DEG C, adopt water-cooled, with the cooldown rate of 13 DEG C/s, steel is cooled to 390 DEG C again, finally adopt compression air or vaporific quenching liquid, with the cooldown rate of 9 DEG C/s, steel is cooled to room temperature；Making first-phase in this steel plate be ferrite by above heat treatment, second-phase is pearlite, is 11.7% on surface to 1/4 thickness place second-phase percentage by volume, and 1/4 thickness is 3.7% to center second-phase percentage by volume, and without banded structure；Being 4.7 μm on surface to 1/4 thickness place ferrite average crystal grain diameter, pearlite colony average diameter is 5.3 μm, and 1/4 thickness is 4.3 μm to center ferrite average crystal grain diameter, and pearlite colony average diameter is 6.3 μm.
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| CN102732799A (en) * | 2012-07-09 | 2012-10-17 | 武汉钢铁(集团)公司 | Acid corrosion resistant steel for soleplate in hull and production method thereof |
| CN103526129A (en) * | 2013-09-27 | 2014-01-22 | 济钢集团有限公司 | Thick-specification acid-corrosion-resisting X65 pipeline steel plate and manufacturing method thereof |
| CN104388837A (en) * | 2014-12-19 | 2015-03-04 | 山东钢铁股份有限公司 | Acid-corrosion-resistant X70 pipeline steel plate and manufacturing method thereof |
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