CN110387503A - A kind of low-alloy SA622GrB steel plate and production method - Google Patents
A kind of low-alloy SA622GrB steel plate and production method Download PDFInfo
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- CN110387503A CN110387503A CN201910666444.1A CN201910666444A CN110387503A CN 110387503 A CN110387503 A CN 110387503A CN 201910666444 A CN201910666444 A CN 201910666444A CN 110387503 A CN110387503 A CN 110387503A
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
-
- 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
-
- 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a kind of low-alloy SA622GrB steel plate and production method, steel plate chemical component composition and mass percentage meet it is claimed below: C:0.15-0.18%, Si:0.30-0.40%, Mn:1.00-1.50%, P≤0.007%, S≤0.005%, surplus are Fe and inevitable impurity；Production method includes the following process: steel-making, rolling slow cooling, heat treatment procedure.The present invention is by optimizing ingredient and accurately controlling, the plate property of production is completely superior to standard requirements, realizes the matched well of armor plate strength and toughness, and gained plate property meets: tensile strength Rm:480-585MPa, yield strength Rel >=290MPa, elongation percentage A >=23%；- 20 DEG C of impact average value >=60J；HB≤200.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of low-alloy SA622GrB steel plate and production method.
Background technique
SA622GrB steel is low-alloy carbon manganese silicon steel plate, is widely used in the industries such as petroleum, chemical industry, power station, boiler, is used
In production reactor, heat exchanger, separator, spherical tank, oil gas tank, liquefied petroleum gas tank, nuclear power reactor pressure vessel, boiler drum, liquid
Equipment and the components such as fossil oil and gas bottle, power station high-pressure water pipe, water wheels volute.To steel plate when due to the design of current equipment manufacturing
Performance requirement it is higher and higher, to meet the needs of device fabrication, need to propose high requirement to the production of steel plate, the present invention pass through
It is optimized, C, Si, Mn element is accurately controlled, while reducing P, S by the ingredient to steel plate in production process
Constituent content, and re-optimization is carried out by steel rolling and heat treatment process, the steel plate with excellent mechanical property requirements is developed, it is full
Sufficient intensity and toughness matched well, meet device requirement, are key points of the present invention.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of low-alloy SA622GrB steel plates；The present invention also provides a kind of low
The production method of alloy SA622GrB steel plate.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: a kind of low-alloy SA622GrB steel plate, it is described
Steel plate chemical component composition and mass percentage meet claimed below: C:0.15-0.18%, Si:0.30-0.40%, Mn:
1.00-1.50%, P≤0.007%, S≤0.005%, surplus are Fe and inevitable impurity；
Steel plate thickness of the present invention is 50~80mm.
The present invention also provides a kind of production method of low-alloy SA622GrB steel plate, the production method includes following work
Sequence: steel-making, rolling slow cooling, heat treatment procedure.
Steel making working procedure of the present invention: using electric furnace+external refining, is kept for the white slag time 25-35 minutes, total refining time
45-55 minutes, condition of tapping: T >=1580 DEG C, continuous casting billet was made in 0.7-0.8m/min in casting speed control in continuous casting process.
Rolling slow cooling operation of the present invention: continuous casting billet uses roughing+finish rolling rolling mill practice, rough rolling step start rolling temperature
950-1100 DEG C, it is 20-30% that previous three passes, which control drafts, 900-930 DEG C of start rolling temperature of the finish rolling stage, controls accumulative pressure
Amount is 40-45%, rolls rear steel plate and carries out stacking slow cooling, 300-350 DEG C of stacking temperature in time.
Heat treatment procedure of the present invention: normalizing furnace progress normalizing, 900~930 DEG C of normalizing temperature, soaking time: 2~
2.3min/mm, it is air-cooled to obtain required steel plate.
The present invention has the beneficial effect that the plate property of production is completely excellent by optimizing to ingredient and accurately controlling
In standard requirements, the matched well of armor plate strength and toughness is realized, gained plate property meets: tensile strength Rm:480-
585MPa, yield strength Rel >=290MPa, elongation percentage A >=23%；- 20 DEG C of impact average value >=60J；HB≤200.The steel of production
Plate consistency is high, and internal soundness is good, and whole plate stable mechanical property fully meets the requirement of steel plate, is suitble to low-alloy steel
The manufacture of plate uses.
Specific embodiment
The present invention will be further described in detail below with reference to specific embodiments.
Embodiment 1
The present embodiment low-alloy SA622GrB steel plate thickness is 50mm, chemical component composition and mass percentage: C:
0.15%, Si:0.30%, Mn:1.00%, P0.007%, S0.005%, surplus are Fe and inevitable impurity；
The production method of low-alloy SA622GrB steel plate, the production method include the following process: hot and cold place is delayed in steel-making, rolling
Science and engineering sequence, specific process step are as described below:
(1) steel making working procedure: using electric furnace+external refining, is kept for the white slag time 25 minutes, total refining time 45-55 minutes, is tapped
Condition: T1580 DEG C, continuous casting billet is made in 0.7m/min in casting speed control in continuous casting process.
(2) roll slow cooling operation: continuous casting billet use roughing+finish rolling rolling mill practice, 950 DEG C of rough rolling step start rolling temperature,
It is 30% that previous three passes, which control drafts, 930 DEG C of finish rolling stage start rolling temperature, and controlling accumulative drafts is 45%, roll rear steel plate and
Shi Jinhang stacking slow cooling, 350 DEG C of stacking temperature.
(3) heat treatment procedure: normalizing furnace progress normalizing, 900 DEG C of normalizing temperature, soaking time: 2.3min/mm, it is air-cooled to be
Obtain required steel plate.
The mechanical property of the present embodiment low-alloy SA622GrB steel plate is shown in Table 1.
Embodiment 2
The present embodiment low-alloy SA622GrB steel plate thickness is 55mm, chemical component composition and mass percentage: C:
0.18%, Si:0.40%, Mn:1.50%, P0.006%, S0.004%, surplus are Fe and inevitable impurity；
The production method of low-alloy SA622GrB steel plate, the production method include the following process: hot and cold place is delayed in steel-making, rolling
Science and engineering sequence, specific process step are as described below:
(1) steel making working procedure: using electric furnace+external refining, is kept for the white slag time 35 minutes, total refining time 45-55 minutes, is tapped
Condition: T1590 DEG C, continuous casting billet is made in 0.8m/min in casting speed control in continuous casting process.
(2) roll slow cooling operation: continuous casting billet use roughing+finish rolling rolling mill practice, 1100 DEG C of rough rolling step start rolling temperature,
It is 20% that previous three passes, which control drafts, 900 DEG C of finish rolling stage start rolling temperature, and controlling accumulative drafts is 40%, roll rear steel plate and
Shi Jinhang stacking slow cooling, 300 DEG C of stacking temperature.
(3) heat treatment procedure: normalizing furnace carry out normalizing, 930 DEG C of normalizing temperature, soaking time: 2min/mm, it is air-cooled to obtain the final product
To required steel plate.
The mechanical property of the present embodiment low-alloy SA622GrB steel plate is shown in Table 1.
Embodiment 3
The present embodiment low-alloy SA622GrB steel plate thickness is 65mm, chemical component composition and mass percentage: C:
0.16%, Si:0.35%, Mn:1.30%, P0.005%, S0.003%, surplus are Fe and inevitable impurity；
The production method of low-alloy SA622GrB steel plate, the production method include the following process: hot and cold place is delayed in steel-making, rolling
Science and engineering sequence, specific process step are as described below:
(1) steel making working procedure: using electric furnace+external refining, is kept for the white slag time 30 minutes, total refining time 50 minutes, out steel bar
Part: T1585 DEG C, continuous casting billet is made in 0.75m/min in casting speed control in continuous casting process.
(2) roll slow cooling operation: continuous casting billet use roughing+finish rolling rolling mill practice, 1000 DEG C of rough rolling step start rolling temperature,
It is 25% that previous three passes, which control drafts, 920 DEG C of finish rolling stage start rolling temperature, and controlling accumulative drafts is 42%, roll rear steel plate and
Shi Jinhang stacking slow cooling, 330 DEG C of stacking temperature.
(3) heat treatment procedure: normalizing furnace progress normalizing, 920 DEG C of normalizing temperature, soaking time: 2.2min/mm, it is air-cooled to be
Obtain required steel plate.
The mechanical property of the present embodiment low-alloy SA622GrB steel plate is shown in Table 1.
Embodiment 4
The present embodiment low-alloy SA622GrB steel plate thickness is 80mm, chemical component composition and mass percentage: C:
0.16%, Si:0.36%, Mn:1.40%, P0.006%, S0.003%, surplus are Fe and inevitable impurity；
The production method of low-alloy SA622GrB steel plate, the production method include the following process: hot and cold place is delayed in steel-making, rolling
Science and engineering sequence, specific process step are as described below:
(1) steel making working procedure: using electric furnace+external refining, is kept for the white slag time 32 minutes, total refining time 52 minutes, out steel bar
Part: T1595 DEG C, continuous casting billet is made in 0.76m/min in casting speed control in continuous casting process.
(2) roll slow cooling operation: continuous casting billet use roughing+finish rolling rolling mill practice, 970 DEG C of rough rolling step start rolling temperature,
It is 24% that previous three passes, which control drafts, 910 DEG C of finish rolling stage start rolling temperature, and controlling accumulative drafts is 43%, roll rear steel plate and
Shi Jinhang stacking slow cooling, 340 DEG C of stacking temperature.
(3) heat treatment procedure: normalizing furnace progress normalizing, 925 DEG C of normalizing temperature, soaking time: 2.1min/mm, it is air-cooled to be
Obtain required steel plate.
The mechanical property of the present embodiment low-alloy SA622GrB steel plate is shown in Table 1.
Embodiment 5
The present embodiment low-alloy SA622GrB steel plate thickness is 52mm, chemical component composition and mass percentage: C:
0.165%, Si:0.37%, Mn:1.45%, P0.005%, S0.004%, surplus are Fe and inevitable impurity；
The production method of low-alloy SA622GrB steel plate, the production method include the following process: hot and cold place is delayed in steel-making, rolling
Science and engineering sequence, specific process step are as described below:
(1) steel making working procedure: using electric furnace+external refining, is kept for the white slag time 33 minutes, total refining time 53 minutes, out steel bar
Part: T1596 DEG C, continuous casting billet is made in 0.77m/min in casting speed control in continuous casting process.
(2) roll slow cooling operation: continuous casting billet use roughing+finish rolling rolling mill practice, 985 DEG C of rough rolling step start rolling temperature,
It is 25% that previous three passes, which control drafts, 923 DEG C of finish rolling stage start rolling temperature, and controlling accumulative drafts is 44%, roll rear steel plate and
Shi Jinhang stacking slow cooling, 345 DEG C of stacking temperature.
(3) heat treatment procedure: normalizing furnace progress normalizing, 923 DEG C of normalizing temperature, soaking time: 2.2min/mm, it is air-cooled to be
Obtain required steel plate.
The mechanical property of the present embodiment low-alloy SA622GrB steel plate is shown in Table 1.
Embodiment 6
The present embodiment low-alloy SA622GrB steel plate thickness is 70mm, chemical component composition and mass percentage: C:
0.155%, Si:0.38%, Mn:1.20%, P0.005%, S0.003%, surplus are Fe and inevitable impurity；
The production method of low-alloy SA622GrB steel plate, the production method include the following process: hot and cold place is delayed in steel-making, rolling
Science and engineering sequence, specific process step are as described below:
(1) steel making working procedure: using electric furnace+external refining, is kept for the white slag time 33 minutes, total refining time 51 minutes, out steel bar
Part: T1594 DEG C, continuous casting billet is made in 0.75m/min in casting speed control in continuous casting process.
(2) roll slow cooling operation: continuous casting billet use roughing+finish rolling rolling mill practice, 975 DEG C of rough rolling step start rolling temperature,
It is 23% that previous three passes, which control drafts, 913 DEG C of finish rolling stage start rolling temperature, and controlling accumulative drafts is 41%, roll rear steel plate and
Shi Jinhang stacking slow cooling, 315 DEG C of stacking temperature.
(3) heat treatment procedure: normalizing furnace progress normalizing, 924 DEG C of normalizing temperature, soaking time: 2.2min/mm, it is air-cooled to be
Obtain required steel plate.
The mechanical property of the present embodiment low-alloy SA622GrB steel plate is shown in Table 1.
The mechanical property of 1 embodiment 1-6 low-alloy SA622GrB steel plate of table
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 the present invention into
Go detailed description, those skilled in the art should understand that: it can still modify to the present invention or equally replace
It changes, without departing from the spirit or scope of the invention, or any substitutions, should all cover and be wanted in right of the invention
It asks in range.
Claims (6)
1. a kind of low-alloy SA622GrB steel plate, which is characterized in that the steel plate chemical component composition and mass percentage are full
Sufficient C:0.15-0.18%, Si:0.30-0.40%, Mn:1.00-1.50% claimed below, P≤0.007%, S≤0.005%, surplus are
Fe and inevitable impurity.
2. a kind of low-alloy SA622GrB steel plate according to claim 1, which is characterized in that the steel plate thickness be 50~
80mm。
3. a kind of production method of low-alloy SA622GrB steel plate described in -2 any one according to claim 1, feature exist
In the production method includes the following process: steel-making, rolling slow cooling, heat treatment procedure.
4. a kind of production method of low-alloy SA622GrB steel plate according to claim 3, which is characterized in that the steel-making
Process: use electric furnace external refining, keep the white slag time 25-35 minute, total refining time 45-55 minutes, tapping condition: T >=
1580 DEG C, continuous casting billet is made in 0.7-0.8m/min in casting speed control in continuous casting process.
5. a kind of production method of low-alloy SA622GrB steel plate according to claim 4, which is characterized in that the rolling
Slow cooling operation: continuous casting billet uses the rolling mill practice of roughing and finish rolling, 950-1100 DEG C of rough rolling step start rolling temperature, previous three passes control
Drafts processed is 20-30%, and 900-930 DEG C of start rolling temperature of the finish rolling stage, controlling accumulative drafts is 40-45%, roll rear steel plate and
Shi Jinhang stacking slow cooling, 300-350 DEG C of stacking temperature.
6. a kind of production method of low-alloy SA622GrB steel plate, feature according to claim 4-5 any one exist
In the heat treatment procedure: normalizing furnace progress normalizing, 900~930 DEG C of normalizing temperature, soaking time: 2~2.3min/mm, it is empty
Required steel plate is obtained after cold.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111254362A (en) * | 2020-03-31 | 2020-06-09 | 湖南华菱湘潭钢铁有限公司 | Production method of Gr.B-grade normalizing pipeline steel |
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| CN111254362A (en) * | 2020-03-31 | 2020-06-09 | 湖南华菱湘潭钢铁有限公司 | Production method of Gr.B-grade normalizing pipeline steel |
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Application publication date: 20191029 |