CN108977732A - Great surface quality and the heat bundle steel plate and its production method with good welds performance - Google Patents
Great surface quality and the heat bundle steel plate and its production method with good welds performance Download PDFInfo
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- CN108977732A CN108977732A CN201810909077.9A CN201810909077A CN108977732A CN 108977732 A CN108977732 A CN 108977732A CN 201810909077 A CN201810909077 A CN 201810909077A CN 108977732 A CN108977732 A CN 108977732A
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- 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
-
- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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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)
- Heat Treatment Of Steel (AREA)
Abstract
The present invention relates to steel plate manufacturing technology fields, specifically great surface quality and heat bundle steel plate and its production method with good welds performance, the steel plate chemical component composition and mass percentage are as follows: C:0.08~0.12%, Si:0.20~0.40%, Mn:1.00~1.50%, Ti:0.04~0.15%, P≤0.015%, S≤0.008%, remaining is Fe and inevitable impurity, meet simultaneously: 0.30%≤Ceq≤0.38%, Pcm≤0.20%, the wherein calculation formula of Ceq and Pcm are as follows: Ceq=C+Mn/6+Si/24+Ni/40+Cr/5+Mo/4+V/14, Pcm=C+Si/30+Mn/20+Cu/ 20+Ni/60+Cr/20+Mo/15+V/10+5B；The steel plate is suitable for the steel plate of 10 ~ 100mm of thickness thickness, and tensile strength >=510MPa, surface smoothness is good, color pastiness, the defects of without obvious pit, point, while having good welding performance, mechanical especially suitable for fabrication.
Description
Technical field
The present invention relates to steel plate manufacturing technology fields, specifically great surface quality and the heat bundle steel with good welds performance
Plate and its production method.
Background technique
With the increasingly fierceness of construction machinery industry competition, domestic and international main Engineering Machinery Components production firm is to steel
Plate surface quality requirement is also higher and higher.With the manufacturer of the maximum earthmoving equipment in the whole world, building machinery and mining equipment
For Caterpillar of the U.S., surface of steel plate ball blast front and back is proposed there is not allowed that fish scale-shaped, spider reticulation decorative pattern, former
Do not allow red piebald iron scale occur on then, does not allow reconditioning, do not allow surface crater occur.To roll marks, pockmark, draw
Hurt area and depth it is also proposed that stringent regulation.In addition to plate surface quality, in order to guarantee that it is safe that engineering machinery uses, it is desirable that steel
Plate base material connects performance with good.Such great surface quality steel plate average selling price is higher than general plate nearly 1,000 yuan, economic benefit
It is very significant.
In order to obtain great surface quality steel plate, domestic steel mill mostly uses control Si content 0.2% hereinafter, even requiring low
In 0.15%, however, Si is the essential elements of deoxidation in steel making, and higher content reinforcing and carbide is inhibited to be formed and increased
Stability of retained austenite, and then increase the element of steel plate ductility, while there is certain invigoration effect, in order to guarantee steel plate
Intensity, steel mill are made up using precious alloys such as addition Nb, V, Ni mostly, this is uneconomical worthless.
The present invention in the past, has been reported that more in relation to great surface quality hot rolled steel plate at home, has also applied for patent.Such as the patent No.
A kind of manufacturing method of great surface quality hot rolled steel plate is disclosed for the Chinese patent of CN102764760, it is by by Si
Content control 0.15% hereinafter, carry out certain process optimization, process control to whole flow process simultaneously, obtain have it is higher
The hot rolled steel plate of surface quality.But it does not consider the welding performance of base material, does not consider curly course, rolling rhythm, crosscutting aligning
Etc. influence of the factors to high strength steel plate surface quality.Its tensile strength is below 510MPa simultaneously, and intensity rank is relatively low.
China Patent No. is the patent document of CN106566986, and it discloses " for manufacturing the high surface of excavator swing arm
Quality hot rolled steel plate and manufacturing method ", chemical component include: C:0.01 ~ 0.25%, and Si:0.005 ~ 0.20%, Mn:0.10 ~
2.0%, Nb:0.005 ~ 0.10%, V:0.005 ~ 0.20%, Ti:0.01 ~ 0.15%, Als:0.020 ~ 0.07%, P≤0.025%, S≤
0.015%, surplus is Fe and other inevitable impurity.It also added precious alloy Nb, V in addition to basic element, pass through biography
The rolling mill practice of system obtains with a thickness of 5~20mm, and tensile strength is the steel plate of 485 ~ 511MPa, uncomfortable for > 20mm thick steel plate
With.
If Chinese patent CN101947557 is a kind of preparation method for reducing scales generated on surfaces of hot-rolled steel plates, it
Steel temperature, finish rolling open rolling and finishing temperature, coiling temperature and the type of cooling is taken out by control slab to realize and reduce iron scale life
At purpose.Such method mainly passes through control tapping temperature, reduces nascent oxidation thickness of scale, reduces steel to a certain extent
Plate surface quality, but welding performance is not referred to.
Summary of the invention
The object of the invention is to provide great surface quality and with good to solve above-mentioned the shortcomings of the prior art
The heat of good welding performance pricks steel plate and its production method.
Concrete scheme of the invention is: great surface quality and the heat bundle steel plate with good welds performance, the steel plate
It studies and is grouped as and mass percentage is as follows: C:0.08~0.12%, Si:0.20~0.40%, Mn:1.00~1.50%, Ti:
0.04~0.15%, P≤0.015%, S≤0.008%, remaining is Fe and inevitable impurity, is met simultaneously: 0.30%≤Ceq
≤ 0.38%, Pcm≤0.20%, the wherein calculation formula of Ceq and Pcm are as follows: Ceq=C+Mn/6+Si/24+Ni/40+Cr/5+Mo/4+
V/14, Pcm=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B.
Steel plate thickness of the present invention is 10 ~ 100mm, tensile strength >=510MPa.
The production method of steel plate of the present invention the following steps are included: the compound smelting in converter top bottom → field trash Calcium treatment →
LF refining → RH furnace vacuum processing → continuous casting → slab slow cooling → slab heating → high-pressure water descaling → rolling → cooling → finishing；
Wherein the temperature of slab heating is 1170 ~ 1230 DEG C, and the rate of heat addition is 8 ~ 10min/cm, guarantees that microalloy element is molten in steel
Enter in austenite, while preventing AUSTENITE GRAIN COARSENING.
Wherein the technological parameter of high-pressure water descaling is as follows: de-scaling pressure >=25MPa, and 1000 ~ 1100 DEG C of de-scaling temperature, nozzle
Horizontal by 45 ~ 75 DEG C；
Wherein rolling is divided into two stages: a stage rolling pass is 4 ~ 7 passages, and preceding 3 passage carries out de-scaling, de-scaling water to slab
Pressure >=25MPa, the 1st passage of two-stage and last 3 passages carry out de-scaling, de-scaling hydraulic pressure >=25MPa, two-stage open rolling temperature to slab
≤ 980 DEG C of degree carries out nitrogen purging to steel plate simultaneously during fuselage de-scaling.
In rolling mill practice of the present invention, finish to gauge has that carry temperature be 840 ~ 890 DEG C, and the mill speed of last 2 passage is 4 ~
6m/s。
When steel plate of the present invention to width greater than 3000mm cools down, increase side spray and nitrogen purging, opening cold temperature is
700 ~ 750 DEG C, 600 ~ 650 DEG C are cooled to 5 ~ 8 DEG C of cooling velocities per second, is then air-cooled to room temperature.
Slab slow cooling of the present invention uses 48h slow cooling, spreads the hydrogen in slab sufficiently, reduces cooling bring internal stress.
It stacks after finishing in production method of the present invention, overhead traveling crane disk package cloth set is protected in transport process, to cross
Shifting, turnover panel rack bolster are wooden, in one layer of oilcloth of periphery covering after steel plate finished product stacking storage, prevent rainwater splash corrosion or oily
It is dirty.
The reasons why ingredient setting of steel of the present invention described below.
C: carbon can increase substantially the intensity of steel, increase the wearability of steel plate, but carbon is also carbon equivalent and weld crack
Sensitivity coefficient mainly influences element, and carbon content increases, and causes carbon equivalent and weld crack sensitivity coefficient to increase considerably to shadow
Welding performance is rung, therefore is controlled 0.08~0.12%.
Si: silicon is the essential elements of deoxidation in steel making, and higher content reinforcing and carbide is inhibited to be formed and increased residual
Stabilization of austenite is stayed, and then increases the element of steel plate ductility, while there is certain invigoration effect.When silicone content is lower than
When 0.2%, it is unable to ensure the effect.When being more than a certain amount of, the cleanliness of steel reduces silicone content, can generate and be not easy pickling
Scale defect is easy production low melting point silicate in welding, increases simultaneously as the clear resultant force of silicon and oxygen is stronger than iron
Slag and the mobility for melting metal, cause expulsion events, reduce welding performance, therefore control 0.2 ~ 0.4%.
Mn: manganese can reduce the lower change point of steel, increase the cooling degree of supercooling of austenite, refine pearlitic structrure, Yi Jigai
Be apt to its mechanical property, but with the increase of manganese content, the thermal conductivity of steel sharply declines, linear expansion coefficient rise, make quickly heat or
Biggish internal stress is formed when cooling, workpiece tearing tendency increases, therefore controls 1.00~1.50%.
Ti: titanium is the strong deoxidier in steel, can make the dense internal organization of steel, refines crystal grain, reduce aging sensitivity and
Cold brittleness, improving welding property, a certain amount of Ti, which is added, can also reduce vertical, horizontal performance difference.In addition to this, titanium is compared
The intensified elements such as niobium, vanadium have biggish resource and cost advantage, price less than its 1/10th, therefore design Ti content are as follows:
0.040~0.15%.
P: P elements increase temper brittleness and cold short sensibility, and the welding performance of steel is made to degenerate, and reduce plasticity, therefore design P
Content≤0.015%.
S: sulphur is also harmful element in general, so that steel is generated red brittleness, reduces the ductility and toughness of steel, forging
It makes and is also easy to produce crackle when rolling, unfavorable to welding performance when sulfur content is high, reduction corrosion resistance, therefore design S content≤
0.008%。
The present invention has the advantage that 1, using lower cost ingredient design system compared with prior art, without to existing
Production equipment makees key technological transformation, so that it may produce a kind of great surface quality and the production with good welds performance hot rolled steel plate
Method, the engineering machinery class steel for being suitable for that there is superior weldability energy with a thickness of 10 ~ 100mm, intensity requirement >=510MPa；2,
Strict control harmful element P, S content is assisted with certain rolling, and cooling technique guarantees that armor plate strength reaches 510MPa or more,
By carrying out strict control to carbon equivalent Ceq, weld crack sensitivity coefficient Pcm, guarantee that steel plate has good welding performance；3,
Strict control burns steel temperature, the rate of heat addition, rolling rhythm, carries out strict specifications to de-scaling opportunity, pressure, and wide according to steel plate
Degree is different, and the auxiliary cooling device of unlatching is different, obtains a kind of surface pastiness, without pockmark, no-watermark, iron scale is thin and compact
Steel plate；4, it stacks, traversing, turnover panel rack bolster wood is further protected in the package cloth set protection of overhead traveling crane disk in transport process
Surface of steel plate finish is demonstrate,proved, one layer of oilcloth need to be covered in periphery after avoiding mechanical damage, steel plate finished product from stacking storage, prevent rain
Water projection corrosion or greasy dirt；5, such steel plate steel is high value added product, and chemical component is relatively easy, and production process is easy
Operation, lower production costs compare common low-alloy remarkable in economical benefits.
Specific embodiment
Illustrate that advantages of the present invention, the present invention list 10 embodiments in order to clearer, and provides 2 comparative examples
Compare and analyze, referring to 1 ~ table of table 3, in which: table 1 be 10 embodiments enumerating of the present invention and 2 comparative examples chemistry at
Point, table 2 is the technological parameter of the embodiment of the present invention and comparative example, and table 3 is the actual mass pair of the embodiment of the present invention and comparative example
Than；
Embodiment 1
The present embodiment is great surface quality and the heat with good welds performance pricks steel plate, chemical component composition and quality percentage
Content is as follows: C:0.083%, Si:0.32%, Mn:1.43%, P:0.010%, S:0.004%, Ti:0.055%, remaining is for Fe and not
Evitable impurity (include residual elements Cr:0.021%, Ni:0.005%, Cu:0.021%, Mo:0.002%, V in impurity:
0.0025%, B:0.00026%), carbon equivalent Ceq=0.34% of the steel plate, weld crack sensitivity coefficient Pcm=0.17%, Ceq and
The calculation formula of Pcm are as follows: Ceq=C+Mn/6+Si/24+Ni/40+Cr/5+Mo/4+V/14, Pcm=C+Si/30+Mn/20+Cu/20
+Ni/60+Cr/20+Mo/15+V/10+5B。
Steel plate thickness described in the present embodiment is 10mm, tensile strength 547MPa.
The manufacturing method of steel plate described in the present embodiment is the following steps are included: the compound smelting in converter top bottom → field trash Calcium treatment
→ LF refining → RH furnace vacuum processing → continuous casting → slab slow cooling → slab heating → high-pressure water descaling → rolling → cooling → essence
It is whole；
Wherein the temperature of slab heating is 1200 DEG C, rate of heat addition 10min/cm, guarantees that microalloy element dissolves in Ovshinsky in steel
In body, while preventing AUSTENITE GRAIN COARSENING.
Wherein the technological parameter of high-pressure water descaling is as follows: de-scaling pressure be 25MPa, de-scaling temperature be 1035 DEG C, nozzle with
Horizontal plane is in 60 DEG C；
Wherein rolling is divided into two stages: 7 passage of a stage rolling, and preceding 3 passage carries out de-scaling to slab, and de-scaling hydraulic pressure is
25.2MPa, the 1st passage of two-stage and last 3 passages carry out de-scaling (being indicated in table 2 with 1+3) to slab, and de-scaling hydraulic pressure is
25.2MPa, two-stage rolling temperature≤980 DEG C carry out nitrogen purging to steel plate simultaneously during fuselage de-scaling.
In rolling mill practice described in the present embodiment, it is 885 DEG C that finish to gauge, which has load temperature, the mill speed of two-stage last 2 passage
Respectively 5m/s, 6m/s.
It stacks after finishing, overhead traveling crane disk package cloth set is protected in transport process, to traversing, turnover panel rack bolster
Wood, steel plate finished product stack storage after periphery cover one layer of oilcloth, prevent rainwater splash corrosion or greasy dirt.
Referring to table 3, the yield strength of steel plate described in the present embodiment is 399MPa, tensile strength 547MPa, and elongation percentage is
29%, -20 DEG C of ballistic work is 196J, and surface smoothness is good, color pastiness, does not have apparent pit, point, scuffing, rust
The defects of the defects of erosion, welding performance is good, is not likely to produce crackle.
The steel plate chemical component and technological parameter of embodiment 2-10 is to make certain adjustment on the basis of embodiment 1, is detailed in
Table 1, table 2, see Table 3 for details for the actual mass testing result of embodiment 2-10.
The quality in kind of table 3 embodiment of the present invention and comparative example
From table 3 it can be seen that the yield strength of the embodiment of the present invention, tensile strength, elongation percentage and ballistic work are differed with comparative example
Less, but the surface quality of the embodiment of the present invention is obviously more preferable, while welding performance is more excellent.
Claims (5)
1. great surface quality and with good welds performance heat prick steel plate, it is characterized in that: the steel plate chemical component composition and
Mass percentage is as follows: C:0.08~0.12%, Si:0.20~0.40%, Mn:1.00~1.50%, Ti:0.04~0.15%, P
≤ 0.015%, S≤0.008%, remaining is Fe and inevitable impurity, is met simultaneously: 0.30%≤Ceq≤0.38%, Pcm≤
0.20%, the wherein calculation formula of Ceq and Pcm are as follows: Ceq=C+Mn/6+Si/24+Ni/40+Cr/5+Mo/4+V/14, Pcm=C+
Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B。
2. great surface quality according to claim 1 and the heat bundle steel plate with good welds performance, it is characterized in that: described
Steel plate thickness is 10 ~ 100mm, tensile strength >=510MPa.
3. great surface quality according to claim 1 and the heat with good welds performance prick the production method of steel plate,
It is characterized in: the following steps are included: the compound smelting in converter top bottom → field trash Calcium treatment → LF refining → RH furnace vacuum processing → company
Casting → slab slow cooling → slab heating → high-pressure water descaling → rolling → cooling → finishing；
Wherein the technological parameter of high-pressure water descaling is as follows: de-scaling pressure >=25MPa, and 1000 ~ 1100 DEG C of de-scaling temperature, nozzle and water
Plane is in 45 ~ 75 DEG C；
Wherein rolling is divided into two stages: a stage rolling pass is 4 ~ 7 passages, and preceding 3 passage carries out de-scaling, de-scaling water to slab
Pressure >=25MPa, the 1st passage of two-stage and last 3 passages carry out de-scaling, de-scaling hydraulic pressure >=25MPa, two-stage open rolling temperature to slab
≤ 980 DEG C of degree carries out nitrogen purging to steel plate simultaneously during fuselage de-scaling.
4. production method according to claim 3, it is characterized in that: in the rolling mill practice, finish to gauge have carry temperature be 840 ~
890 DEG C, the mill speed of last 2 passage is 4 ~ 6m/s.
5. production method according to claim 3, it is characterized in that: when the steel plate to width greater than 3000mm cools down,
Increase side spray and nitrogen purging, opening cold temperature is 700 ~ 750 DEG C, 600 ~ 650 DEG C are cooled to 5 ~ 8 DEG C of cooling velocities per second,
Then it is air-cooled to room temperature.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810909077.9A CN108977732B (en) | 2018-08-10 | 2018-08-10 | Hot-rolled steel plate with high surface quality and good welding performance and production method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810909077.9A CN108977732B (en) | 2018-08-10 | 2018-08-10 | Hot-rolled steel plate with high surface quality and good welding performance and production method thereof |
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| CN108977732A true CN108977732A (en) | 2018-12-11 |
| CN108977732B CN108977732B (en) | 2020-05-05 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101250664A (en) * | 2008-03-31 | 2008-08-27 | 武汉钢铁(集团)公司 | Hull structural steel with excellent welding performance and producing method thereof |
| CN104561486A (en) * | 2015-01-22 | 2015-04-29 | 首钢总公司 | Thick hot continuous rolling steel strip with excellent ultralow temperature CTOD (China railway high speed) performance and production method thereof |
| JP2017193759A (en) * | 2016-04-21 | 2017-10-26 | 新日鐵住金株式会社 | Thick steel sheet and manufacturing method therefor |
| CN107937802A (en) * | 2017-10-26 | 2018-04-20 | 江阴兴澄特种钢铁有限公司 | 60 80mm thickness low-crackle sensitives, easy weld-end fittings steel plate and its manufacture method used under a kind of cryogenic conditions |
-
2018
- 2018-08-10 CN CN201810909077.9A patent/CN108977732B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101250664A (en) * | 2008-03-31 | 2008-08-27 | 武汉钢铁(集团)公司 | Hull structural steel with excellent welding performance and producing method thereof |
| CN104561486A (en) * | 2015-01-22 | 2015-04-29 | 首钢总公司 | Thick hot continuous rolling steel strip with excellent ultralow temperature CTOD (China railway high speed) performance and production method thereof |
| JP2017193759A (en) * | 2016-04-21 | 2017-10-26 | 新日鐵住金株式会社 | Thick steel sheet and manufacturing method therefor |
| CN107937802A (en) * | 2017-10-26 | 2018-04-20 | 江阴兴澄特种钢铁有限公司 | 60 80mm thickness low-crackle sensitives, easy weld-end fittings steel plate and its manufacture method used under a kind of cryogenic conditions |
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Address after: No. 215, Wuchang Avenue, Hubei, Ezhou, Hubei Patentee after: Baowu group Echeng Iron and Steel Co., Ltd Address before: No. 215, Wuchang Avenue, Hubei, Ezhou, Hubei Patentee before: WUHAN IRON AND STEEL GROUP ECHENG IRON AND STEEL Co.,Ltd. |