CN109182921A - A kind of normalizing type big-thickness structure steel plate and its production method - Google Patents
A kind of normalizing type big-thickness structure steel plate and its production method Download PDFInfo
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- CN109182921A CN109182921A CN201811162581.3A CN201811162581A CN109182921A CN 109182921 A CN109182921 A CN 109182921A CN 201811162581 A CN201811162581 A CN 201811162581A CN 109182921 A CN109182921 A CN 109182921A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a kind of normalizing type big-thickness structure steel plate and its production methods, the normalizing type big-thickness structure is formed with steel plate chemical component and mass percentage are as follows: C:0.15-0.18%, Mn:1.10-1.30%, P≤0.015%, S≤0.003%, Cu≤0.055%, N≤0.012%, surplus are Fe and inevitable impurity；The production method includes steel-making, continuous casting, heating, rolling, normalizing heat treatment procedure.The present invention is using carbon and manganese strengthened as basic condition, it is designed by reasonable ingredient and process for making controls, cooperate normalizing heat treatment technique appropriate, the normalizing type big-thickness structure of production 1/4 position performance of steel plate plate thickness: tensile strength Rm:400~540MPa, yield strength Rp0.2 >=225MPa, elongation percentage A >=19%, 0 DEG C of impact of collision function >=27J have better conformed to the demand in structural steel market.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of normalizing type big-thickness structure steel plate and its producer
Method.
Background technique
Structural carbon steel is not thermally treated under normal circumstances, and directly uses under supply status.Usual such steel carbon
Mass fraction it is low, good welding performance, plasticity, good toughness have some strength, be often rolled into thin plate, reinforcing bar, welded still pipe etc.,
For the parts such as the structures such as bridge, building and manufacture plain screw, nut.
With the significantly promotion of steel production technology level, the scientific research of China's structural steel, production and application achieve compared with
Big development, but the speed of development is compared with industrially developed country and is had a certain gap, and the total number and technology of structural steel contain
Amount is high, the multipurpose steel plate number of good combination property is very little.For the needs and design of commensurate structure steel plate future development
It being increasingly stringenter, the requirement to structural steel is also higher and higher, and it is mainly manifested in thickness and increases trend, solderability requirement raising, compared with
Low ingredient design is to guarantee the necessary condition of steel plate good welds, but this will certainly reduce the mechanical property of steel plate.
A kind of big thickness steel plate is developed, under the premise of guaranteeing steel plate good welds, effectively obtains stable performance, more
The demand in good commensurate structure steel market has important Social benefit and economic benefit.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of normalizing type big-thickness structure steel plates；The present invention also provides one
The production method of kind normalizing type big-thickness structure steel plate.
In order to solve the above technical problems, the technical solution used in the present invention is: a kind of normalizing type big-thickness structure steel
Plate, the normalizing type big-thickness structure is formed with steel plate chemical component and its mass percentage are as follows: C:0.15-0.18%, Mn:
1.10-1.30%, P≤0.015%, S≤0.003%, Cu≤0.055%, N≤0.012%, surplus are Fe and inevitable impurity.
Normalizing type big-thickness structure steel plate thickness specification of the present invention is 100~120mm.
Normalizing type big-thickness structure of the present invention 1/4 position performance of steel plate plate thickness: tensile strength Rm:400~
540MPa, yield strength Rp0.2 >=225MPa, elongation percentage A >=19%；0 DEG C of impact of collision function >=27J.
The present invention also provides a kind of production method of normalizing type big-thickness structure steel plate, the production method includes refining
Steel, continuous casting, heating, rolling, normalizing heat treatment procedure；The steel making working procedure, refining process retention time >=50min, tapping temperature
1620~1640 DEG C of degree；The normalizing heat treatment procedure, normalizing holding temperature are 890~910 DEG C, total heating time 1.8~
2.5min/mm。
Continuous casting working procedure of the present invention, continuous casting billet chemical component composition and mass percentage are as follows: C:0.15-0.18%,
Mn:1.10-1.30%, P≤0.015%, S≤0.003%, Cu≤0.55%, N≤0.012%, surplus be Fe and inevitably it is miscellaneous
Matter.
Heating process of the present invention, blank heat in continuous oven, and 1250 DEG C of maximum heating temperature, soaking temperature 1220
~1240 DEG C, 0.80~1.00min/mm of heating coefficient.
Rolling process of the present invention, I stage start rolling temperature are 1050~1100 DEG C, shine steel with a thickness of 2H, the H be at
Product steel plate thickness；II stage rolling start rolling temperature≤900 DEG C, 820~850 DEG C of finishing temperature；It is cooling using ACC after rolling, it returns red
Temperature is controlled at 730~750 DEG C.
Normalizing heat treatment procedure of the present invention uses the air-cooled type of cooling after normalizing, obtain the big thickness of normalizing type
Spend structural steel plate.
Normalizing type big-thickness structure of the present invention is as described below with the effect of each component and content in steel plate chemical component:
C: main intensified element is remarkably improved armor plate strength by solution strengthening；But the excessively high weldability to steel plate of carbon content
It is affected with toughness, optimum content C:0.15-0.18%.
Mn: can improve the intensity and harden ability of steel, improve the hot-working character of steel, meanwhile, Mn can eliminate the influence of S, together
When, manganese is weak carbide formation element, and Mn too high levels will cause the plasticity of steel and welding performance and reduce, optimum content Mn:
1.10-1.30%。
P and S: being the harmful element in steel under normal circumstances, will increase the brittleness of steel, and P becomes the welding performance of steel
It is bad, plasticity is reduced, cold-bending property is made to degenerate；S reduces the ductility and toughness of steel, will cause crackle in rolling；Therefore it should use up
Amount reduces content of the P and S in steel, controls in P≤0.015%, S≤0.003%.
Cu: improving the weather-resistance of ordinary low-alloy steel, and copper, which is added, can also improve the intensity and yield tensile ratio of steel, and
Welding performance is not had an impact, content is controlled in Cu≤0.055%.
N: nitrogen can improve the intensity of steel, low-temperature flexibility and weldability, increase aging sensitivity, N≤0.012%.
Normalizing type big-thickness structure of the present invention steel sheet product canonical reference EN10025；Product mechanical property detection method
Canonical reference EN10025.
The beneficial effects of adopting the technical scheme are that 1, normalizing type big-thickness structure steel plate of the present invention with
Carbon and the basic condition of manganese strengthened conduct, are designed by reasonable ingredient and process for making control, normalizing appropriate is cooperated to be heat-treated
Technique, the normalizing type big-thickness structure 1/4 position performance of steel plate plate thickness of production: tensile strength Rm:400~540MPa, surrender
Intensity Rp0.2 >=225MPa, elongation percentage A >=19%, 0 DEG C of impact of collision function >=27J.2, normalizing type big-thickness structure of the present invention is used
Steel plate has good welding performance and mechanical property, has preferably adapted to the demand in structural steel market.
Specific embodiment
The present invention will be further described in detail below with reference to specific embodiments.
Embodiment 1
The present embodiment normalizing type big-thickness structure is 100mm, chemical component composition and mass percentage with steel plate thickness are as follows:
C:0.15%, Mn:1.30%, P:0.012%, S:0.002%, Cu:0.020%, N:0.0034%, surplus be Fe and inevitably it is miscellaneous
Matter.
The production method of the present embodiment normalizing type big-thickness structure steel plate includes steel-making, continuous casting, heating, rolling, normalizing
Heat treatment procedure, specific process step are as described below:
(1) steel making working procedure: refining process retention time 55min, 1620 DEG C of tapping temperature；
(2) continuous casting working procedure: continuous casting billet chemical component composition and its mass percentage are as follows: C:0.15%, Mn:1.30%, P:
0.012%, S:0.002%, Cu:0.020%, N:0.0034%, surplus are Fe and inevitable impurity；
(3) heating process: blank heats in continuous oven, and 1250 DEG C of maximum heating temperature, 1220 DEG C of soaking temperature, heating coefficient
1.00min/mm；
(4) rolling process: I stage start rolling temperature is 1050 DEG C, shines steel with a thickness of 200mm；II stage rolling start rolling temperature 900
DEG C, it is 850 DEG C of finishing temperature, cooling using ACC after rolling, 750 DEG C of red temperature；
(5) normalizing heat treatment procedure: normalizing holding temperature is 890 DEG C, total heating time 2.5min/mm, using air-cooled after normalizing
The type of cooling obtains the normalizing type big-thickness structure steel plate.
The present embodiment normalizing type big-thickness structure steel plate, 1/4 position performance of plate thickness: tensile strength Rm:470MPa, surrender
Intensity Rp0.2:295MPa, elongation percentage A:28%；0 DEG C of impact of collision function 145J, 174J, 156J；Obdurability matching is good.
Embodiment 2
The present embodiment normalizing type big-thickness structure is 105mm, chemical component composition and mass percentage with steel plate thickness are as follows:
C:0.18%, Mn:1.10%, P:0.013%, S:0.003%, Cu:0.020%, N:0.0035%, surplus be Fe and inevitably it is miscellaneous
Matter.
The production method of the present embodiment normalizing type big-thickness structure steel plate includes steel-making, continuous casting, heating, rolling, normalizing
Heat treatment procedure, specific process step are as described below:
(1) steel making working procedure: refining process retention time 56min, 1640 DEG C of tapping temperature；
(2) continuous casting working procedure: continuous casting billet chemical component composition and its mass percentage are as follows: C:0.18%, Mn:1.10%, P:
0.013%, S:0.003%, Cu:0.020%, N:0.0035%, surplus are Fe and inevitable impurity；
(3) heating process: blank heats in continuous oven, and 1250 DEG C of maximum heating temperature, 1240 DEG C of soaking temperature, heating coefficient
0.80min/mm；
(4) rolling process: I stage start rolling temperature is 1100 DEG C, shines steel with a thickness of 210mm；II stage rolling start rolling temperature 890
DEG C, it is 820 DEG C of finishing temperature, cooling using ACC after rolling, 730 DEG C of red temperature；
(5) normalizing heat treatment procedure: normalizing holding temperature is 910 DEG C, total heating time 1.8min/mm, using air-cooled after normalizing
The type of cooling obtains the normalizing type big-thickness structure steel plate.
The present embodiment normalizing type big-thickness structure steel plate, 1/4 position performance of plate thickness: tensile strength Rm:468MPa, surrender
Intensity Rp0.2:284MPa, elongation percentage A:29%；0 DEG C of impact of collision function 175J, 167J, 189J；Obdurability matching is good.
Embodiment 3
The present embodiment normalizing type big-thickness structure is 110mm, chemical component composition and mass percentage with steel plate thickness are as follows:
C:0.17%, Mn:1.23%, P:0.014%, S:0.001%, Cu:0.024%, N:0.0033%, surplus be Fe and inevitably it is miscellaneous
Matter.
The production method of the present embodiment normalizing type big-thickness structure steel plate includes steel-making, continuous casting, heating, rolling, normalizing
Heat treatment procedure, specific process step are as described below:
(1) steel making working procedure: refining process retention time 58min, 1625 DEG C of tapping temperature；
(2) continuous casting working procedure: continuous casting billet chemical component composition and its mass percentage are as follows: C:0.17%, Mn:1.23%, P:
0.014%, S:0.001%, Cu:0.024%, N:0.0033%, surplus are Fe and inevitable impurity；
(3) heating process: blank heats in continuous oven, and 1250 DEG C of maximum heating temperature, 1230 DEG C of soaking temperature, heating coefficient
0.90min/mm；
(4) rolling process: I stage start rolling temperature is 1070 DEG C, shines steel with a thickness of 220mm；II stage rolling start rolling temperature 880
DEG C, it is 830 DEG C of finishing temperature, cooling using ACC after rolling, 735 DEG C of red temperature；
(5) normalizing heat treatment procedure: normalizing holding temperature is 900 DEG C, total heating time 2.0min/mm, using air-cooled after normalizing
The type of cooling obtains the normalizing type big-thickness structure steel plate.
The present embodiment normalizing type big-thickness structure steel plate, 1/4 position performance of plate thickness: tensile strength Rm:490MPa, surrender
Intensity Rp0.2:304MPa, elongation percentage A:26%；0 DEG C of impact of collision function 172J, 149J, 162J；Obdurability matching is good.
Embodiment 4
The present embodiment normalizing type big-thickness structure is 120mm, chemical component composition and mass percentage with steel plate thickness are as follows:
C:0.16%, Mn:1.22%, P:0.010%, S:0.002%, Cu:0.023%, N:0.0034%, surplus be Fe and inevitably it is miscellaneous
Matter.
The production method of the present embodiment normalizing type big-thickness structure steel plate includes steel-making, continuous casting, heating, rolling, normalizing
Heat treatment procedure, specific process step are as described below:
(1) steel making working procedure: refining process retention time 56min, 1630 DEG C of tapping temperature；
(2) continuous casting working procedure: continuous casting billet chemical component composition and its mass percentage are as follows: C:0.16%, Mn:1.22%, P:
0.010%, S:0.002%, Cu:0.023%, N:0.0034%, surplus are Fe and inevitable impurity；
(3) heating process: blank heats in continuous oven, and 1250 DEG C of maximum heating temperature, 1230 DEG C of soaking temperature, heating coefficient
0.95min/mm；
(4) rolling process: I stage start rolling temperature is 1080 DEG C, shines steel with a thickness of 240mm；II stage rolling start rolling temperature 870
DEG C, it is 840 DEG C of finishing temperature, cooling using ACC after rolling, 740 DEG C of red temperature；
(5) normalizing heat treatment procedure: normalizing holding temperature is 905 DEG C, total heating time 1.9min/mm, using air-cooled after normalizing
The type of cooling obtains the normalizing type big-thickness structure steel plate.
The present embodiment normalizing type big-thickness structure steel plate, 1/4 position performance of plate thickness: tensile strength Rm:475MPa, surrender
Intensity Rp0.2:306MPa, elongation percentage A:27%；0 DEG C of impact of collision function 143J, 164J, 157J；Obdurability matching is good.
Embodiment 5
The present embodiment normalizing type big-thickness structure is 115mm, chemical component composition and mass percentage with steel plate thickness are as follows:
C:0.15%, Mn:1.14%, P:0.015%, S:0.002%, Cu:0.035%, N:0.0072%, surplus be Fe and inevitably it is miscellaneous
Matter.
The production method of the present embodiment normalizing type big-thickness structure steel plate includes steel-making, continuous casting, heating, rolling, normalizing
Heat treatment procedure, specific process step are as described below:
(1) steel making working procedure: refining process retention time 50min, 1625 DEG C of tapping temperature；
(2) continuous casting working procedure: continuous casting billet chemical component composition and its mass percentage are as follows: C:0.15%, Mn:1.14%, P:
0.015%, S:0.002%, Cu:0.035%, N:0.0072%, surplus are Fe and inevitable impurity；
(3) heating process: blank heats in continuous oven, and 1250 DEG C of maximum heating temperature, 1225 DEG C of soaking temperature, heating coefficient
0.82min/mm；
(4) rolling process: I stage start rolling temperature is 1060 DEG C, shines steel with a thickness of 230mm；II stage rolling start rolling temperature 895
DEG C, it is 825 DEG C of finishing temperature, cooling using ACC after rolling, 735 DEG C of red temperature；
(5) normalizing heat treatment procedure: normalizing holding temperature is 896 DEG C, total heating time 2.1min/mm, using air-cooled after normalizing
The type of cooling obtains the normalizing type big-thickness structure steel plate.
The present embodiment normalizing type big-thickness structure steel plate, 1/4 position performance of plate thickness: tensile strength Rm:402MPa, surrender
Intensity Rp0.2:226MPa, elongation percentage A:25%；0 DEG C of impact of collision function 113J, 124J, 127J；Obdurability matching is good.
Embodiment 6
The present embodiment normalizing type big-thickness structure is 107mm, chemical component composition and mass percentage with steel plate thickness are as follows:
C:0.18%, Mn:1.26%, P:0.010%, S:0.001%, Cu:0.055%, N:0.012%, surplus be Fe and inevitably it is miscellaneous
Matter.
The production method of the present embodiment normalizing type big-thickness structure steel plate includes steel-making, continuous casting, heating, rolling, normalizing
Heat treatment procedure, specific process step are as described below:
(1) steel making working procedure: refining process retention time 52min, 1635 DEG C of tapping temperature；
(2) continuous casting working procedure: continuous casting billet chemical component composition and its mass percentage are as follows: C:0.18%, Mn:1.26%, P:
0.010%, S:0.001%, Cu:0.055%, N:0.012%, surplus are Fe and inevitable impurity；
(3) heating process: blank heats in continuous oven, and 1250 DEG C of maximum heating temperature, 1235 DEG C of soaking temperature, heating coefficient
0.93min/mm；
(4) rolling process: I stage start rolling temperature is 1090 DEG C, shines steel with a thickness of 214mm；II stage rolling start rolling temperature 885
DEG C, it is 835 DEG C of finishing temperature, cooling using ACC after rolling, 745 DEG C of red temperature；
(5) normalizing heat treatment procedure: normalizing holding temperature is 902 DEG C, total heating time 2.3min/mm, using air-cooled after normalizing
The type of cooling obtains the normalizing type big-thickness structure steel plate.
The present embodiment normalizing type big-thickness structure steel plate, 1/4 position performance of plate thickness: tensile strength Rm:435MPa, surrender
Intensity Rp0.2:254MPa, elongation percentage A:19%；0 DEG C of impact of collision function 103J, 114J, 107J；Obdurability matching is good.
Embodiment 7
The present embodiment normalizing type big-thickness structure is 113mm, chemical component composition and mass percentage with steel plate thickness are as follows:
C:0.16%, Mn:1.17%, P:0.011%, S:0.002%, Cu:0.043%, N:0.0092%, surplus be Fe and inevitably it is miscellaneous
Matter.
The production method of the present embodiment normalizing type big-thickness structure steel plate includes steel-making, continuous casting, heating, rolling, normalizing
Heat treatment procedure, specific process step are as described below:
(1) steel making working procedure: refining process retention time 54min, 1632 DEG C of tapping temperature；
(2) continuous casting working procedure: continuous casting billet chemical component composition and its mass percentage are as follows: C:0.16%, Mn:1.17%, P:
0.011%, S:0.002%, Cu:0.043%, N:0.0092%, surplus are Fe and inevitable impurity；
(3) heating process: blank heats in continuous oven, and 1250 DEG C of maximum heating temperature, 1224 DEG C of soaking temperature, heating coefficient
0.87min/mm；
(4) rolling process: start rolling temperature is 1065 DEG C, shines steel with a thickness of 226mm；II 875 DEG C of stage rolling start rolling temperature, finish to gauge
It is 843 DEG C of temperature, cooling using ACC after rolling, 737 DEG C of red temperature；
(5) normalizing heat treatment procedure: normalizing holding temperature is 907 DEG C, total heating time 2.4min/mm, using air-cooled after normalizing
The type of cooling obtains the normalizing type big-thickness structure steel plate.
The present embodiment normalizing type big-thickness structure steel plate, 1/4 position performance of plate thickness: tensile strength Rm:537MPa, surrender
Intensity Rp0.2:342MPa, elongation percentage A:23%；0 DEG C of impact of collision function 123J, 134J, 127J；Obdurability matching is good.
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although referring to above-described embodiment to this hair
It is bright to be described in detail, those skilled in the art should understand that: still the present invention can be modified or be waited
With replacement, without departing from the spirit or scope of the invention, or any substitutions, should all cover in power of the invention
In sharp claimed range.
Claims (8)
1. a kind of normalizing type big-thickness structure steel plate, which is characterized in that the normalizing type big-thickness structure with steel plate chemistry at
Be grouped as and its mass percentage are as follows: C:0.15-0.18%, Mn:1.10-1.30%, P≤0.015%, S≤0.003%, Cu≤
0.055%, N≤0.012%, surplus are Fe and inevitable impurity.
2. a kind of normalizing type big-thickness structure steel plate according to claim 1, which is characterized in that the big thickness of normalizing type
Degree structural steel plate thickness specification is 100~120mm.
3. a kind of normalizing type big-thickness structure steel plate according to claim 1, which is characterized in that the big thickness of normalizing type
1/4 position performance of structural steel plate plate thickness: tensile strength Rm:400~540MPa, yield strength Rp0.2 >=225MPa is spent, is extended
Rate A >=19%；0 DEG C of impact of collision function >=27J.
4. special based on a kind of production method of normalizing type big-thickness structure steel plate described in claim 1-3 any one
Sign is that the production method includes steel-making, continuous casting, heating, rolling, normalizing heat treatment procedure；The steel making working procedure, refined
The journey retention time >=50min, 1620~1640 DEG C of tapping temperature；The normalizing heat treatment procedure, normalizing holding temperature be 890~
910 DEG C, total 1.8~2.5min/mm of heating time.
5. a kind of production method of normalizing type big-thickness structure steel plate according to claim 4, which is characterized in that described
Continuous casting working procedure, continuous casting billet chemical component composition and mass percentage are as follows: C:0.15-0.18%, Mn:1.10-1.30%, P≤
0.015%, S≤0.003%, Cu≤0.55%, N≤0.012%, surplus are Fe and inevitable impurity.
6. a kind of production method of normalizing type big-thickness structure steel plate according to claim 4, which is characterized in that described
Heating process, blank heat in continuous oven, and 1250 DEG C of maximum heating temperature, 1220~1240 DEG C of soaking temperature, heating coefficient
0.80~1.00min/mm.
7. a kind of production method of normalizing type big-thickness structure steel plate according to claim 4-6 any one, special
Sign is that the rolling process, I stage start rolling temperature is 1050~1100 DEG C, and shining steel with a thickness of 2H, the H is finished steel plate
Thickness；II stage rolling start rolling temperature≤900 DEG C, 820~850 DEG C of finishing temperature；It is cooling using ACC after rolling, red temperature control
System is at 730~750 DEG C.
8. a kind of production method of normalizing type big-thickness structure steel plate according to claim 4-6 any one, special
Sign is that the normalizing heat treatment procedure uses the air-cooled type of cooling after normalizing, obtains the normalizing type big-thickness structure and uses
Steel plate.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110453055A (en) * | 2019-08-16 | 2019-11-15 | 舞阳钢铁有限责任公司 | A kind of production method of big thickness Q500 level steel plate |
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Application publication date: 20190111 |