CN114395725A - Production method for producing steel plate with yield of 300MPa grade by adopting chromium-molybdenum alloy - Google Patents
Production method for producing steel plate with yield of 300MPa grade by adopting chromium-molybdenum alloy Download PDFInfo
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Abstract
The invention relates to the technical field of production of pressure vessel steel plates, and particularly discloses a production method for producing a steel plate with yield of 300MPa by adopting chromium-molybdenum alloy, wherein the steel plate comprises the following chemical components in percentage by mass: c: 0.15 to 0.18%, Si: 0.20 to 0.40%, Mn: 0.50-0.70%, P is less than or equal to 0.020%, S is less than or equal to 0.010%, Alt is less than or equal to 0.050%, N is less than or equal to 0.0080%, Ni is less than or equal to 0.30%, and Cr: 0.90-1.20%, Mo: 0.45-0.60%, and the balance of Fe and unavoidable elements; the invention adopts microalloying technology, and the steel plate for the 6-50 mm middle-high temperature pressure container with yield of 300MPa is manufactured by controlling rolling, normalizing heat treatment and tempering heat treatment, wherein the yield strength of the steel plate is more than or equal to 300MPa, the tensile strength of the steel plate is more than or equal to 450MPa, the elongation after fracture of the steel plate is more than or equal to 20%, the transverse 20 ℃ impact of the steel plate is more than or equal to 100J, and the transverse 0 ℃ impact of the steel plate is more than or equal to 100J.
Description
Technical Field
The invention belongs to the technical field of pressure vessel steel plate production, and particularly relates to a production method for producing a steel plate with yield of 300MPa by adopting chromium-molybdenum alloy.
Background
With the development of society, the method has higher comprehensive indexes on the strength and plasticity of the steel plate production, so that the method is suitable for the production of medium-low temperature pressure vessels to ensure the safe use of the medium-low temperature pressure vessels, but the existing production method of the 300 MPa-grade steel plate cannot increase the oxidation resistance and heat resistance of the steel plate, so that the tempering stability of the steel plate is poor, the steel plate is easy to cause brittleness caused by tempering, and the strength of the steel plate is influenced.
Disclosure of Invention
The invention aims to provide a production method for producing a steel plate with yield of 300MPa by adopting chromium-molybdenum alloy, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a steel plate with yield of 300MPa grade is produced by adopting chromium-molybdenum alloy, and the steel plate comprises the following chemical components in percentage by mass: c: 0.15 to 0.18%, Si: 0.20 to 0.40%, Mn: 0.50-0.70%, P is less than or equal to 0.020%, S is less than or equal to 0.010%, Alt is less than or equal to 0.050%, N is less than or equal to 0.0080%, Ni is less than or equal to 0.30%, and Cr: 0.90-1.20%, Mo: 0.45-0.60%, and the balance of Fe and unavoidable elements.
A production method for producing a steel plate with yield of 300MPa by adopting chromium-molybdenum alloy comprises the following steps:
firstly, smelting in a converter, wherein C contained in steel tapping is controlled to be more than or equal to 0.06 percent, and P is controlled to be less than or equal to 0.015 percent;
step two, LF refining, wherein the white slag retention time is more than or equal to 15min, and the S contained in the steel is controlled to be less than or equal to 0.010%;
step three, slab continuous casting, wherein the steel obtained in the step two is adopted to cast a slab, and the thickness of the slab is 150 mm;
step four, stacking and cooling the plate blank, wherein the stacking and cooling time of the plate blank is more than or equal to 24 hours;
fifthly, heating the plate blank, and controlling the temperature to 1150-1280 ℃;
step six, rolling control, namely rolling control in two stages;
seventhly, normalizing heat treatment is carried out, wherein the normalizing temperature is 880-920 ℃;
and step eight, tempering heat treatment, wherein the tempering temperature is 650-700 ℃, and finally the steel plate finished product is prepared.
In the second step, the whole process is protected and cast, and the casting temperature is controlled according to the liquidus temperature plus 10 to plus 25 ℃.
And step five, heating by adopting a walking beam type heating furnace.
In the sixth step, the two-stage controlled rolling is divided into a first-stage controlled rolling and a second-stage controlled rolling, wherein,
the first stage controlled rolling comprises the following steps: rolling in a recrystallization zone, wherein the temperature range is 980-1120 ℃;
and a second stage: rolling temperature interval of non-recrystallization zone: the initial rolling temperature is 840-960 ℃, and the final rolling temperature is 760-880 ℃.
The pass reduction rate of the recrystallization zone rolling is more than or equal to 15 percent, and the total rolling reduction rate of the non-recrystallization zone rolling is more than or equal to 50 percent.
And seventhly, keeping the heat preservation time of the normalizing heat treatment at 1.4-1.7 min/mm, and cooling the plate blank to room temperature in air.
And step eight, the tempering heat treatment heat preservation time is 2.8-3.2 min/mm, and the plate blank is cooled to room temperature by air.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention adopts microalloying technology, and the steel plate for the 6-50 mm middle-high temperature pressure container with yield of 300MPa is manufactured by controlling rolling, normalizing heat treatment and tempering heat treatment, wherein the yield strength of the steel plate is more than or equal to 300MPa, the tensile strength of the steel plate is more than or equal to 450MPa, the elongation after fracture of the steel plate is more than or equal to 20%, the transverse 20 ℃ impact of the steel plate is more than or equal to 100J, and the transverse 0 ℃ impact of the steel plate is more than or equal to 100J.
(2) The invention can effectively increase the oxidation resistance and the heat resistance of the steel plate and greatly improve the tempering stability of the steel plate, thereby inhibiting the brittleness of the steel plate caused by tempering, realizing the increase of the strength of the steel plate and facilitating the production and the use of the steel plate.
(3) The invention can ensure the elongation and impact toughness of the steel plate and effectively increase the yield strength and tensile strength of the steel plate.
Drawings
FIG. 1 is a process flow diagram of the present invention;
FIG. 2 is a microstructure diagram of a steel plate with a yield of 300MPa produced by using a chromium molybdenum alloy according to example 1 of the present invention;
FIG. 3 is a microstructure diagram of a steel plate with a yield of 300MPa produced by using a chromium molybdenum alloy according to example 2 of the present invention;
FIG. 4 is a microstructure diagram of a steel plate with a yield of 300MPa produced by using a chromium molybdenum alloy according to example 3 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The principle and the control mechanism of the chemical element consumption are as follows:
c: the carbon content is one of main elements for improving the strength of steel, the yield strength and the tensile strength of steel are improved along with the increase of the carbon content, but the elongation and the impact toughness of the steel are reduced along with the increase of the carbon content, and when the steel with higher C content is welded, the hardening phenomenon can also occur in a welding heat affected zone, which will aggravate the tendency of cold cracking during welding, so that the carbon content of 0.15-0.18% is adopted;
si: it is helpful for improving the strength of steel, and has a sedative effect;
mn: it is a solid solution strengthening element, and is beneficial to improving the strength of the steel plate;
p: the steel has a cold brittleness tendency, and the content of the steel is as low as possible;
s: the steel has a hot cracking tendency, and the content of the steel is as low as possible;
n: the steel has a hot cracking tendency, and the content of the steel is as low as possible;
al: the method is mainly used for deoxidizing and refining grains;
cr: the solid solution strengthening effect is achieved, and the oxidation resistance and heat resistance of the steel can be improved;
mo: the high carbide forming ability can obviously improve the recrystallization temperature of steel, improve the tempering stability and inhibit the brittleness of alloy steel caused by tempering.
Example 1:
a production method for producing a steel plate with yield of 300MPa by adopting chromium-molybdenum alloy is disclosed, the chemical components and the mass percent of the steel plate are shown in Table 1, and the process steps of the steel plate production method comprise:
smelting in a converter: controlling the tapping C to be more than or equal to 0.06 percent and the tapping P to be less than or equal to 0.015 percent; slag falling in the tapping process is avoided;
LF refining: the white slag is kept for more than 15min, and S is controlled to be less than or equal to 0.010 percent;
slab continuous casting: the thickness of the casting blank is 150mm, the casting is protected in the whole process, and the casting temperature is controlled according to the liquidus temperature plus 10 to plus 25 ℃;
and (3) slab stacking and cooling: the slab is cooled in a heaped mode for not less than 24 hours;
heating the plate blank: a walking beam type heating furnace is adopted, and the temperature is controlled to be 1150-1280 ℃;
controlling rolling: the rolling is controlled by adopting two stages, wherein the first stage comprises the following steps: rolling temperature interval of recrystallization zone: 980-1120 ℃, and the rolling pass reduction rate of the recrystallization zone is more than or equal to 15%; and a second stage: rolling temperature interval of non-recrystallization zone: the initial rolling temperature is 840-960 ℃, the rolling total reduction rate of a non-recrystallization area is more than or equal to 50%, and the final rolling temperature is 760-880 ℃;
normalizing heat treatment: normalizing at 880-920 ℃, keeping the temperature for 1.4-1.7 min/mm, and air cooling to room temperature;
tempering heat treatment: tempering temperature is 650-700 ℃, heat preservation time is 2.8-3.2 min/mm, and air cooling is carried out until the room temperature.
In the present example, the metallographic structure of the steel sheet was ferrite and pearlite.
In the example, a microstructure diagram of a steel plate with a yield of 300MPa produced by adopting chromium-molybdenum alloy is shown in FIG. 2, and performance indexes are shown in Table 2.
Table 1 example 1 steel sheet composition (wt%)
| C | Si | Mn | P | S | Al | Cr | Mo | N | CEV |
| 0.151 | 0.25 | 0.62 | 0.014 | 0.006 | 0.03 | 1.07 | 0.466 | 0.0049 | 0.57 |
TABLE 1
Note: CEV is carbon equivalent and is calculated by the formula: CEV: c + Mn/6+ (Cr + Mo + V)/5+ (Ni + Cu)/15.
TABLE 2 example 1 Heat treatment Process and Performance index
TABLE 2
Example 2:
a production method for producing a steel plate with yield of 300MPa by adopting chromium-molybdenum alloy is disclosed, the chemical components and the mass percent of the steel plate are shown in a table 3, and the process steps of the steel plate production method comprise:
smelting in a converter: controlling the tapping C to be more than or equal to 0.06 percent and the tapping P to be less than or equal to 0.015 percent; slag falling in the tapping process is avoided;
LF refining: the white slag is kept for more than 15min, and S is controlled to be less than or equal to 0.010 percent;
slab continuous casting: the thickness of the casting blank is 150mm, the casting is protected in the whole process, and the casting temperature is controlled according to the liquidus temperature plus 10 to plus 25 ℃;
and (3) slab stacking and cooling: the slab is cooled in a heaped mode for not less than 24 hours;
heating the plate blank: a walking beam type heating furnace is adopted, and the temperature is controlled to be 1150-1280 ℃;
controlling rolling: the rolling is controlled by adopting two stages, wherein the first stage comprises the following steps: rolling temperature interval of recrystallization zone: 980-1120 ℃, and the rolling pass reduction rate of the recrystallization zone is more than or equal to 15%;
and a second stage: rolling temperature interval of non-recrystallization zone: the initial rolling temperature is 840-960 ℃, the rolling total reduction rate of a non-recrystallization area is more than or equal to 50%, and the final rolling temperature is 760-880 ℃;
normalizing heat treatment: normalizing at 880-920 ℃, keeping the temperature for 1.4-1.7 min/mm, and air cooling to room temperature;
tempering heat treatment: tempering temperature is 650-700 ℃, heat preservation time is 2.8-3.2 min/mm, and air cooling is carried out until the room temperature.
In the present example, the metallographic structure of the steel sheet was ferrite and pearlite.
In the present example, a microstructure diagram of a steel plate with a yield of 300MPa produced by using a chromium molybdenum alloy is shown in fig. 3, and performance indexes are shown in table 4.
Table 3 example 2 steel sheet composition (wt%)
| C | Si | Mn | P | S | Al | Cr | Mo | N | CEV |
| 0.152 | 0.25 | 0.61 | 0.014 | 0.006 | 0.03 | 1.05 | 0.464 | 0.0049 | 0.57 |
TABLE 3
Note: CEV is carbon equivalent and is calculated by the formula: CEV: c + Mn/6+ (Cr + Mo + V)/5+ (Ni + Cu)/15.
TABLE 4 example 2 Heat treatment Process and Performance index
TABLE 4
Example 3:
a production method for producing a steel plate with yield of 300MPa by adopting chromium-molybdenum alloy is disclosed, the chemical components and the mass percent of the steel plate are shown in Table 5, and the process steps of the steel plate production method comprise:
smelting in a converter: controlling the tapping C to be more than or equal to 0.06 percent and the tapping P to be less than or equal to 0.015 percent; slag falling in the tapping process is avoided;
LF refining: the white slag is kept for more than 15min, and S is controlled to be less than or equal to 0.010 percent;
slab continuous casting: the thickness of the casting blank is 150mm, the casting is protected in the whole process, and the casting temperature is controlled according to the liquidus temperature plus 10 to plus 25 ℃;
and (3) slab stacking and cooling: the slab is cooled in a heaped mode for not less than 24 hours;
heating the plate blank: a walking beam type heating furnace is adopted, and the temperature is controlled to be 1150-1280 ℃;
controlling rolling: the rolling is controlled by adopting two stages, wherein the first stage comprises the following steps: rolling temperature interval of recrystallization zone: 980-1120 ℃, and the rolling pass reduction rate of the recrystallization zone is more than or equal to 15%; and a second stage: rolling temperature interval of non-recrystallization zone: the initial rolling temperature is 840-960 ℃, the rolling total reduction rate of a non-recrystallization area is more than or equal to 50%, and the final rolling temperature is 760-880 ℃;
normalizing heat treatment: normalizing at 880-920 ℃, keeping the temperature for 1.4-1.7 min/mm, and air cooling to room temperature;
tempering heat treatment: tempering temperature is 650-700 ℃, heat preservation time is 2.8-3.2 min/mm, and air cooling is carried out until the room temperature.
In the present example, the metallographic structure of the steel sheet was ferrite and pearlite.
In the present example, a microstructure diagram of a steel plate with a yield of 300MPa produced by using a chromium molybdenum alloy is shown in fig. 4, and performance indexes are shown in table 6.
TABLE 5 example 3 Steel sheet composition (wt%)
| C | Si | Mn | P | S | Al | Cr | Mo | N | CEV |
| 0.150 | 0.25 | 0.63 | 0.014 | 0.006 | 0.03 | 1.07 | 0.468 | 0.0050 | 0.57 |
TABLE 5
Note: CEV is carbon equivalent, and the calculation formula is: CEV: c + Mn/6+ (Cr + Mo + V)/5+ (Ni + Cu)/15.
TABLE 6 example 3 Heat treatment Process and Performance index
TABLE 6
As can be seen from the above examples, the steel sheet manufactured in example 2 has the best performance index, and has excellent yield strength and tensile strength.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A steel plate with yield of 300MPa grade produced by adopting chromium-molybdenum alloy is characterized in that: the steel plate comprises the following chemical components in percentage by mass: c: 0.15 to 0.18%, Si: 0.20 to 0.40%, Mn: 0.50-0.70%, P is less than or equal to 0.020%, S is less than or equal to 0.010%, Alt is less than or equal to 0.050%, N is less than or equal to 0.0080%, Ni is less than or equal to 0.30%, and Cr: 0.90-1.20%, Mo: 0.45-0.60%, and the balance of Fe and unavoidable elements.
2. The production method for producing the steel plate with the yield of 300MPa by adopting the chromium-molybdenum alloy as claimed in claim 1 is characterized in that: the method comprises the following steps:
firstly, smelting in a converter, wherein C contained in steel tapping is controlled to be more than or equal to 0.06 percent, and P is controlled to be less than or equal to 0.015 percent;
step two, LF refining, wherein the white slag retention time is more than or equal to 15min, and the S contained in the steel is controlled to be less than or equal to 0.010%;
step three, slab continuous casting, wherein the steel obtained in the step two is adopted to cast a slab, and the thickness of the slab is 150 mm;
step four, stacking and cooling the plate blank, wherein the stacking and cooling time of the plate blank is more than or equal to 24 hours;
fifthly, heating the plate blank, and controlling the temperature to 1150-1280 ℃;
step six, rolling control, namely rolling control in two stages;
seventhly, normalizing heat treatment is carried out, wherein the normalizing temperature is 880-920 ℃;
and step eight, tempering heat treatment, wherein the tempering temperature is 650-700 ℃, and finally the steel plate finished product is prepared.
3. The production method for producing the steel plate with the yield of 300MPa grade by adopting the chromium-molybdenum alloy as claimed in claim 2 is characterized in that: in the third step, the whole process is protected and cast, and the casting temperature is controlled according to the liquidus temperature plus 10 to plus 25 ℃.
4. The production method for producing the steel plate with the yield of 300MPa grade by adopting the chromium-molybdenum alloy as claimed in claim 2 is characterized in that: and step five, heating by adopting a walking beam type heating furnace.
5. The production method for producing the steel plate with the yield of 300MPa grade by adopting the chromium-molybdenum alloy as claimed in claim 2 is characterized in that: in the sixth step, the two-stage controlled rolling is divided into a first-stage controlled rolling and a second-stage controlled rolling, wherein,
the first stage controlled rolling comprises the following steps: rolling in a recrystallization zone, wherein the temperature range is 980-1120 ℃;
the second stage controlled rolling comprises the following steps: rolling temperature interval of non-recrystallization zone: the initial rolling temperature is 840-960 ℃, and the final rolling temperature is 760-880 ℃.
6. The production method for producing the steel plate with the yield of 300MPa by adopting the chromium-molybdenum alloy as claimed in claim 5 is characterized in that: the pass reduction rate of the recrystallization zone rolling is more than or equal to 15 percent, and the total rolling reduction rate of the non-recrystallization zone rolling is more than or equal to 50 percent.
7. The production method for producing the steel plate with the yield of 300MPa grade by adopting the chromium-molybdenum alloy as claimed in claim 2 is characterized in that: and seventhly, keeping the heat preservation time of the normalizing heat treatment at 1.4-1.7 min/mm, and cooling the plate blank to room temperature in air.
8. The production method for producing the steel plate with the yield of 300MPa grade by adopting the chromium-molybdenum alloy as claimed in claim 2 is characterized in that: and step eight, the tempering heat treatment heat preservation time is 2.8-3.2 min/mm, and the plate blank is cooled to room temperature by air.
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| CN104894477A (en) * | 2014-03-05 | 2015-09-09 | 鞍钢股份有限公司 | 15CrMoR hydrogenation equipment steel production method |
| CN108286015A (en) * | 2018-01-19 | 2018-07-17 | 舞阳钢铁有限责任公司 | Pressure vessel SA387Gr12Cl2 steel plates and its production method |
| KR101978074B1 (en) * | 2017-12-22 | 2019-05-13 | 현대제철 주식회사 | High strength steel and method of manufacturing the same |
| CN111286667A (en) * | 2020-03-17 | 2020-06-16 | 新余钢铁股份有限公司 | Low-temperature toughness chromium-molybdenum steel plate and production method thereof |
| CN112281052A (en) * | 2020-09-17 | 2021-01-29 | 中南大学 | Steel plate for low-carbon low-alloy chromium-molybdenum pressure container and heat treatment method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104894477A (en) * | 2014-03-05 | 2015-09-09 | 鞍钢股份有限公司 | 15CrMoR hydrogenation equipment steel production method |
| KR101978074B1 (en) * | 2017-12-22 | 2019-05-13 | 현대제철 주식회사 | High strength steel and method of manufacturing the same |
| CN108286015A (en) * | 2018-01-19 | 2018-07-17 | 舞阳钢铁有限责任公司 | Pressure vessel SA387Gr12Cl2 steel plates and its production method |
| CN111286667A (en) * | 2020-03-17 | 2020-06-16 | 新余钢铁股份有限公司 | Low-temperature toughness chromium-molybdenum steel plate and production method thereof |
| CN112281052A (en) * | 2020-09-17 | 2021-01-29 | 中南大学 | Steel plate for low-carbon low-alloy chromium-molybdenum pressure container and heat treatment method thereof |
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