CN106756564A - A kind of yield strength 700MPa grades of steel band and its production method - Google Patents
A kind of yield strength 700MPa grades of steel band and its production method Download PDFInfo
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- CN106756564A CN106756564A CN201710021649.5A CN201710021649A CN106756564A CN 106756564 A CN106756564 A CN 106756564A CN 201710021649 A CN201710021649 A CN 201710021649A CN 106756564 A CN106756564 A CN 106756564A
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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
- C21D8/0221—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
- 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
- C22C33/06—Making ferrous alloys by melting using master alloys
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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
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses a kind of yield strength 700MPa grades of steel band and its production method, the steel band chemical composition and mass fraction are as follows：C：0.07 0.10%, Mn：1.6 1.8%, S≤0.005%, P≤0.022%, Si：0.05 0.18%, Al：0.020 0.050%, Ti：0.08 0.13%, Nb：0.05 0.07%, N≤0.005%, remaining is Fe and inevitable impurity element.Production method includes smelting, continuous casting, heating, hot rolling, section cooling and coiling process；The smelting procedure includes converter smelting and LF refining；The heating process, enters heating stove heat between 850 920 DEG C after sheet billet solidification；1,180 1280 DEG C of heating-up temperature.Steel grade yield strength of the invention is more than 700MPa, and tensile strength is 750 920PMa, and product thickness is 1.2 4.0mm, low cost, process is simple.
Description
Technical field
The invention belongs to metallurgical technology field, and in particular to a kind of yield strength 700MPa grades of steel band and its production method.
Background technology
As car ownership increases and automobile consumption becomes increasingly popular, energy-saving and environmental protection that automobile industry faces, safety
Challenge becomes increasingly conspicuous.There are multiple means for reducing automobile energy consumption, reducing discharge, however, being to conventional fuel oil automobile or new
Energy automobile, automotive light weight technology technology is all a basic technology for general character.Automotive light weight technology technology refers to ensure automobile product
On the premise of product use, safety and cost control, by automotive light weight technology design and various lightweighting materials, lightweight manufacturing technology
The vehicle loss of weight that integrated application is realized, and firstly the need of the lifting from steel products intensity in terms of automobile loss of weight.
700MPa grades of high-strength steel band production procedure at present mainly has two kinds.One is to take middle plate strand hot rolling to realize, strand
Thickness is general in more than 150mm, and this general continuous casting speed of production technology continuous casting is relatively low, heating of plate blank technique is easy to control
System.But the relatively low pulling rate of continuous casting causes titanium alloy element that the utilization rate of titanium nitride reduction alloying element is easily combined to form with nitrogen；By
In the strand thicker heating furnace heat time is long, scaling loss serious, heating cost reduction lumber recovery is improved；Due to the thicker hot rolling road of strand
Secondary drafts is big, and thinning risk is larger.Two is to take CSP to produce such steel grade, and current pearl steel passes through electric furnace smelting
Refining-CSP flows, realize the production of such steel grade, by adding niobium, titanium and v element in composition design.Tang Gang is by turning
Stove, LF stoves smelt-FTSR flows and produce the intensity rank steel grade, and niobium, titanium alloy element, continuous casting are only added in terms of composition design
During take take the big pressure of roughing and moderate soak cover technique in pulling rate high, rolling, that finishing temperature high reaches steel grade is strong
Degree target.FTSR flows produce the intensity rank steel grade compared with middle Slab, there is relatively low heating cost, relatively thin casting
Base, improves Thin Specs production stability；More Thin Specs stabilization can be realized by the input of moderate soak cover compared with CSP techniques
Production, the addition that alloying element is reduced in composition design reduces production cost.
The content of the invention
The purpose of invention is to provide a kind of yield strength 700MPa grades of steel band and its production method, and the present invention passes through technique
The reasonable control of parameter, obtains the steel band of more Thin Specs, reduces production cost.
To reach above-mentioned technique effect, the technical solution adopted by the present invention is as follows：A kind of yield strength 700MPa grades of steel band,
The steel band chemical composition and mass fraction are as follows：C：0.07-0.10%,Mn：1.6-1.8%, S≤0.005%, P≤0.022%,
Si：0.05-0.18%, Al：0.020-0.050%, Ti：0.08-0.13%, Nb：0.05-0.07%, N≤0.005%, remaining is Fe
With inevitable impurity element.
Thickness of strips of the present invention is 1.2-4.0mm.
Steel band yield strength >=700MPa of the present invention, tensile strength is 750-900MPa.
A kind of yield strength 700MPa grades of steel band production method, specific steps include smelting, continuous casting, heating, hot rolling, laminar flow
Cooling and coiling process；The smelting procedure includes converter smelting and LF refining；The heating process, sheet billet solidification after
Enter heating stove heat between 850-920 DEG C；1180 DEG C -1280 DEG C of heating-up temperature.
Continuous casting working procedure pulling rate of the present invention is 3.6-4.5m/min.
Hot-rolled process of the present invention, during the product thickness 2.0-4.0mm of rolling, roughing R1, R2 overall reduction are 70-
80%, workpiece thickness 15-22mm.
Hot-rolled process of the present invention, when the product thickness of rolling is 1.2-2.0mm, not including 2.0mm, roughing R1, R2
Overall reduction is 80-83%, and middle base control is between 12-15mm.
Hot-rolled process of the present invention, roughing outlet temperature is 1080-1110 DEG C；Finishing temperature is all controlled to 880 ± 10
℃。
Coiling process of the present invention, product thickness≤2.0mm coiling temperatures are 610 ± 10 DEG C；Product thickness 2.0-
4.0mm, not including 2.0mm, coiling temperature is 630 ± 10 DEG C.
Smelting procedure of the present invention, converter smelting adds mid-carbon fe-mn, and LF refining adds low-carbon ferromanganese, is added without silicon
Iron；Ferrotianium is added before Calcium treatment.
Mentality of designing of the invention is as follows：
（1）The composition design of steel grade, smelting, continuous casting, heating, hot rolling and laminar flow cooling technology；
（2）Smelt composition range：C：0.07-0.10%、Mn：1.6-1.8%、S≤0.005%、P≤0.022%、Si：0.05-
0.18%、Al：0.020-0.050%、Ti：0.08-0.13%、Nb：0.05-0.07%、N≤0.005%；
（3）Converter smelting adds part mid-carbon fe-mn, LF stoves to take low-carbon ferromanganese with manganese, and LF refining operation is added without ferrosilicon, drops
Low sulfur content.Ferrotianium is added before Calcium treatment.Big bag all prevents nitrogen pick-up from opening, add a cover, and continuous casting takes the pulling rate high, pulling rate to be
3.6-4.5m/min, strand enters heating furnace by shearing after slighter compress；
（4）Strand enters heating stove heat between 850-920 DEG C.1180 DEG C -1280 DEG C of heating-up temperature.Roughing outlet temperature is
1080-1110℃.Roughing uses heavy reduction rolling：During product thickness 2.0-4.0mm, roughing R1, R2 overall reduction are 70-
80%, workpiece thickness is 15-22mm.Product thickness is 1.2-2.0mm（Do not include 2.0mm）When, roughing R1, R2 overall reduction
It is 80-83%, workpiece thickness is 12-15mm.Stay-warm case between input roughing and finish rolling.Finishing temperature is 870-890 DEG C.
Product thickness≤2.0mm coiling temperatures are 610 ± 10 DEG C；Product thickness 2.0-4.0mm, not including 2.0mm, coiling temperature is
630±10℃。
Using having the beneficial effect that produced by such scheme：The yield strength produced using such scheme is more than 700MPa's
High-strength steel band, its tensile strength is 750-900MPa, and thickness of strips is 1.2-4.0mm.The production method compared with prior art,
It is advantageous that：Without the alloying elements such as Mo, Ni, B, V reduction production cost, joined by continuous casting, heating and hot rolling technology
The industrialized production of several control realization Thin Specs steel bands.
Specific embodiment
With reference to specific embodiment, the present invention is further detailed explanation.
Embodiment 1
A kind of yield strength 700MPa grades of steel band, composition and mass fraction are as follows：C：0.07%、Mn：1.70%、S：0.002%、P：
0.017%、Si：0.08%、Al：0.050%、Ti：0.1%、Nb：0.07%、N：0.004%；Remaining is Fe and inevitable impurity unit
Element.
A kind of yield strength 700MPa grades of steel band production method, comprises the following steps that：
（1）Smelting procedure：Converter smelting adds mid-carbon fe-mn, LF stoves to take low-carbon ferromanganese with manganese, and LF refining operation is added without silicon
Iron.Ferrotianium is added before Calcium treatment.
（2）Continuous casting working procedure：Big bag all prevents nitrogen pick-up from opening, add a cover.Pulling speed of continuous casting is 3.6m/min, and strand is by light pressure
Shearing enters heating furnace after lower.
（3）Heating process：Enter heating stove heat after sheet billet solidification between 850-920 DEG C.Heating-up temperature 1180-
1280℃。
（4）Hot rolling and coiling process：Roughing outlet temperature is 1080-1110 DEG C.Rolling specs are 4.0mm, 3.5mm；Slightly
Roll drafts and be respectively 70%, 74%, workpiece thickness is respectively 21.0mm, 18.1mm.Input moderate soak cover.Finishing temperature is all
It is controlled to 880 ± 10 DEG C.Coiling temperature is 630 ± 10 DEG C.
The physical property of embodiment 1.
Embodiment 2
A kind of yield strength 700MPa grades of steel band, composition and mass fraction are as follows：C：0.10%、Mn：1.60%、S：0.005%、P：
0.022%、Si：0.18%、Al：0.048%、Ti：0.08%、Nb：0.06%、N：0.003%；Remaining is Fe and inevitable impurity unit
Element.
A kind of yield strength 700MPa grades of steel band production method, comprises the following steps that：
（1）Smelting procedure：With embodiment 1.
（2）Continuous casting working procedure：Big bag all prevents nitrogen pick-up from opening, add a cover.Pulling speed of continuous casting is 3.7m/min, and strand is by light pressure
Shearing enters heating furnace after lower.
（3）Heating process：Enter heating stove heat after sheet billet solidification between 850-920 DEG C.Heating-up temperature 1180-
1280℃。
（4）Hot rolling and coiling process：Roughing outlet temperature is 1080-1110 DEG C.Rolling specs are 3.0mm；Roughing is depressed
It is 75% to measure, and workpiece thickness is 17.0mm.Input moderate soak cover.Finishing temperature is all controlled to 880 ± 10 DEG C.Coiling temperature
It is 630 ± 10 DEG C.
The physical property of embodiment 2.
Embodiment 3
A kind of yield strength 700MPa grades of steel band, composition and mass fraction are as follows：C：0.07%、Mn：1.8%、S：0.001%、P：
0.017%、Si：0.05%、Al：0.020%、Ti：0.11%、Nb：0.06%、N：0.004%；Remaining is Fe and inevitable impurity unit
Element.
A kind of yield strength 700MPa grades of steel band production method, comprises the following steps that：
（1）Smelting procedure：With embodiment 1.
（2）Continuous casting working procedure：Big bag all prevents nitrogen pick-up from opening, add a cover.Pulling speed of continuous casting is 3.8m/min, and strand is by light pressure
Shearing enters heating furnace after lower.
（3）Heating process：Enter heating stove heat after sheet billet solidification between 850-920 DEG C.Heating-up temperature 1180-
1280℃。
（4）Hot rolling and coiling process：Roughing outlet temperature is 1080-1110 DEG C.Rolling specs be 2.5mm, 2.3mm,
2.0mm；Roughing drafts is respectively 75%, 75%, 77%, and workpiece thickness is respectively 17mm, 17mm, 16mm.Input moderate soak
Cover.Finishing temperature is all controlled to 880 ± 10 DEG C.Coiling temperature is 630 ± 10 DEG C.
The physical property of embodiment 3.
Embodiment 4
A kind of yield strength 700MPa grades of steel band, composition and mass fraction are as follows：C：0.10%、Mn：1.75%、S：0.002%、P：
0.011%、Si：0.08%、Al：0.042%、Ti：0.13%、Nb：0.05%、N：0.004%；Remaining is Fe and inevitable impurity unit
Element.
A kind of yield strength 700MPa grades of steel band production method, comprises the following steps that：
（1）Smelting procedure：With embodiment 1.
（2）Continuous casting working procedure：Big bag all prevents nitrogen pick-up from opening, add a cover.Pulling speed of continuous casting is 4.0m/min, and strand is by light pressure
Shearing enters heating furnace after lower.
（3）Heating process：Enter heating stove heat after sheet billet solidification between 850-920 DEG C.Heating-up temperature 1180-
1280℃。
（4）Hot rolling and coiling process：Roughing outlet temperature is 1080-1110 DEG C.Rolling specs be 1.8mm, 1.8mm,
1.5mm；Roughing drafts is respectively 81%, 81%, 83%, and workpiece thickness is respectively 13.0mm, 13.0mm, 12.2mm.In input
Between stay-warm case.Finishing temperature is all controlled to 880 ± 10 DEG C.Coiling temperature is 610 ± 10 DEG C.
The physical property of embodiment 4.
Embodiment 5
A kind of yield strength 700MPa grades of steel band, composition and mass fraction are as follows：C：0.07%、Mn：1.72%、S：0.002%、P：
0.013%、Si：0.10%、Al：0.049%、Ti：0.1116%、Nb：0.0617%、N：0.0042%；Remaining is for Fe and unavoidably
Impurity element.
A kind of yield strength 700MPa grades of steel band production method, comprises the following steps that：
（1）Smelting procedure：With embodiment 1.
（2）Continuous casting working procedure：Big bag all prevents nitrogen pick-up from opening, add a cover.Pulling speed of continuous casting is 4.3m/min, and strand is by light pressure
Shearing enters heating furnace after lower.
（3）Heating process：Enter heating stove heat after sheet billet solidification between 850-920 DEG C.Heating-up temperature 1180-
1280℃。
（4）Hot rolling and coiling process：Roughing outlet temperature is 1080-1110 DEG C.Rolling specs be 1.4mm, 1.2mm,
1.2mm；Roughing drafts is respectively 83%, 83%, 83%, and workpiece thickness is respectively 12mm, 12mm, 12mm.Input moderate soak
Cover.Finishing temperature is all controlled to 880 ± 10 DEG C.Coiling temperature is 610 ± 10 DEG C.
The physical property of embodiment 5.
Embodiment 6
A kind of yield strength 700MPa grades of steel band, composition and mass fraction are as follows：C：0.08%、Mn：1.66%、S：0.002%、P：
0.015%、Si：0.17%、Al：0.022%、Ti：0.13%、Nb：0.07%、N：0.0029%；Remaining is Fe and inevitable impurity
Element.
A kind of yield strength 700MPa grades of steel band production method, comprises the following steps that：
（1）Smelting procedure：With embodiment 1.
（2）Continuous casting working procedure：Big bag all prevents nitrogen pick-up from opening, add a cover.Pulling speed of continuous casting is 4.5m/min, and strand is by light pressure
Shearing enters heating furnace after lower.
（3）Heating process：Enter heating stove heat after sheet billet solidification between 850-920 DEG C.Heating-up temperature 1180-
1280℃。
（4）Hot rolling and coiling process：Roughing outlet temperature is 1080-1110 DEG C.Rolling specs are 1.2mm；Roughing is depressed
Amount is respectively 83%, and workpiece thickness is respectively 12mm.Input moderate soak cover.Finishing temperature is all controlled to 880 ± 10 DEG C.Volume
Temperature is taken for 610 ± 10 DEG C.
The physical property of embodiment 6.
Claims (10)
1. a kind of yield strength 700MPa grades of steel band, it is characterised in that the steel band chemical composition and mass fraction are as follows：C：
0.07-0.10%, Mn：1.6-1.8%, S≤0.005%, P≤0.022%, Si：0.05-0.18%, Al：0.020-0.050%, Ti：
0.08-0.13%, Nb：0.05-0.07%, N≤0.005%, remaining is Fe and inevitable impurity element.
2. a kind of yield strength 700MPa grades of steel band according to claim 1, it is characterised in that the thickness of strips is
1.2-4.0mm。
3. a kind of yield strength 700MPa grades of steel band according to claim 1, it is characterised in that the steel band yield strength
>=700MPa, tensile strength is 750-900MPa.
4., based on a kind of yield strength 700MPa grades of steel band production method described in claim 1-3 any one, its feature exists
In specific steps include smelting, continuous casting, heating, hot rolling, section cooling and coiling process；The smelting procedure includes converter smelting
Refining and LF refining；The heating process, enters heating stove heat between 850-920 DEG C after sheet billet solidification；Heating-up temperature
1180-1280℃。
5. a kind of yield strength 700MPa grades of steel band production method according to claim 4, it is characterised in that the continuous casting
Operation pulling rate is 3.6-4.5m/min.
6. a kind of yield strength 700MPa grades of steel band production method according to claim 4, it is characterised in that the hot rolling
Operation, during the product thickness 2.0-4.0mm of rolling, roughing R1, R2 overall reduction are 70-80%, workpiece thickness 15-22mm.
7. a kind of yield strength 700MPa grades of steel band production method according to claim 4, it is characterised in that the hot rolling
Operation, when the product thickness of rolling is 1.2-2.0mm, not including 2.0mm, roughing R1, R2 drafts are 80-83%, middle base control
System is between 12-15mm.
8. a kind of yield strength 700MPa grades of steel band production method according to claim 4-7 any one, its feature exists
In the hot-rolled process, roughing outlet temperature is 1080-1110 DEG C；Finishing temperature is all controlled to 880 ± 10 DEG C.
9. a kind of yield strength 700MPa grades of steel band production method according to claim 4-7 any one, its feature exists
In the coiling process, product thickness≤2.0mm coiling temperatures are 610 ± 10 DEG C；Product thickness 2.0-4.0mm, does not include
2.0mm, coiling temperature is 630 ± 10 DEG C.
10. a kind of yield strength 700MPa grades of steel band production method according to claim 4-7 any one, its feature exists
In the smelting procedure, converter smelting adds mid-carbon fe-mn, and LF refining adds low-carbon ferromanganese, is added without ferrosilicon；Add before Calcium treatment
Enter ferrotianium.
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| CN113600617A (en) * | 2021-07-13 | 2021-11-05 | 唐山钢铁集团有限责任公司 | Production method of thin 700 MPa-grade low-alloy high-strength steel |
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Application publication date: 20170531 |