CN107716551B - Method based on CSP process production thin gauge hot rolling DP980 steel - Google Patents
Method based on CSP process production thin gauge hot rolling DP980 steel Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
-
- 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
- C22C38/04—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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
Abstract
The invention discloses a kind of methods based on CSP process production thin gauge hot rolling DP980 steel, include the following steps: 1) to adjust molten iron component；2) sheet blank continuous casting, control slab thickness are 55~60mm, and drawing speed is 3.6~3.9m/min；3) conventional soaking, control tapping temperature are 1210~1230 DEG C, and soaking time is 25~35min；4) high-pressure water descaling is carried out；5) seven passage finish rolling are carried out, finishing temperature is 810~830 DEG C DEG C, and Final Stand Rolling speed is 6.0~9.8m/s；6) it two-stage cooling and batches, first segment water cooling is to 670~690 DEG C, then air-cooled 4.2~5.8s, and second segment water cooling is to 100~200 DEG C；7) it carries out smooth.Manufacturing process of the present invention is short, properties of product are stablized, strip shape quality is good, thickness and precision is high, have the characteristics that low cost, high-intensitive, thin gauge and low yield strength ratio, the quality requirement that cold-rolled products can be reached to automobile lightweight, pushes " with hot Dai Leng " process of auto industry to be of great significance.
Description
Technical field
The present invention relates to a kind of hot rolling DP980 steel, particularly relate to a kind of based on CSP process production thin gauge hot rolling DP980
The method of steel.
Background technique
With increasingly depleted and ecological environment the deterioration of the energy, the lightweight of automobile more and more attention has been paid to.Use height
Strength automotive is the effective means realized the energy conservation of automobile loss of weight, improve safety with steel.In the ultralight steel vehicle of International Steel Association
In the works, high strength steel accounts for the 97% of material therefor to body-advanced concept vehicle (ULSAB-AVC), wherein advanced high strength steel
Ratio accounts for 80% or more.But with the continuous improvement of intensity, the forming property of material can worse and worse, especially 980MPa with
On high strength steel, there is cracking, rebound and part size the problems such as required precision is not achieved in forming process, liquidate simultaneously
Pressing equipment, more stringent requirements are proposed, and also has large effect to the service life of mold.
Dual phase steel abbreviation DP steel is the advanced high-strength steel being made of ferrite and martensite two-phase structure, is bent because its is low strong
Than, high initial work hardening rate, good strong plasticity matching and baking and hardening performance etc., can meet automobile various structures part plus
The application demand of strong part and anti-striker becomes the vehicle structure steel of current application amount maximum, most species.DP steel presses producer
Formula is broadly divided into two class of hot rolling DP steel and cold rolling DP steel, and compared with cold rolling DP steel, hot rolling DP steel is at low cost, production procedure is simple
Just the advantages that and comprehensive performance is good.
Currently, mainly based on DP600~DP780, DP780 is especially the hot-rolled dual-phase steel of production and application both at home and abroad
The dual phase steel of DP980 or more rank is still based on cold rolling.Therefore, it develops DP980 and the thin gauge of the above rank is high-strength hot-rolled
Dual phase steel promotes automotive sheet " with hot Dai Leng " to have great importance the application range of expansion hot-rolled dual-phase steel.Such as
The Chinese patent application " a kind of 980MPa grades of hot-rolled dual-phase steel and its manufacturing method " of Publication No. CN 106119703A discloses
A method of 980MPa grades of hot-rolled dual-phase steels being produced in traditional hot rolling producing line, which is C:0.10
~0.20%, Si:0.8~2.0%, Mn:1.0~2.0%, P≤0.02%, S≤0.005%, O≤0.003%, Al:0.02
~0.06%, N≤0.006%, Nb:0.01~0.06%, Ti:0.01~0.05%, remaining is Fe and inevitable impurity,
And above-mentioned element need to meet following relationship: 0.05%≤Nb+Ti≤0.10% simultaneously.The 980MPa grade hot-rolled dual-phase steel is bent
Taking intensity >=500MPa, tensile strength >=980MPa, elongation percentage A80 >=12%, volume fraction shared by ferrite is 20~35%,
Volume fraction shared by martensite is 65~80%.It can be seen that from embodiment, product thickness specification is 3.0~6.0mm, Bu Nengman
Demand of the sufficient automobile industry to " with hot Dai Leng " thin gauge hot-rolled dual-phase steel.
Bar strip continuous casting and rolling flow path organically combines the processes such as the continuous casting of traditional process, heating, rolling, process letter
About efficiently, energy conservation and environmental protection., cooling capacity stronger feature constant using its mill speed, hot rolling that can be stable with production performance
Dual phase steel.But (especially thickness specification is cold by laminar flow during 1.5mm or less) hot rolling DP980 steel in production thin gauge
But section length is short and the fireballing influence of Final Stand Rolling, water cooling time and air cooling time is short so that ferritic transformation is insufficient,
Martensite content is excessively high or even bainite and pearlite occurs, and product yield tensile ratio is higher.In addition, due to being batched using low temperature, it is thin
The plate shape of size hot-rolled DP980 steel is poor, it is necessary to carry out it is smooth, and it is smooth after steel plate occur processing hardening, lead to yield strength
And yield tensile ratio further increases, and causes the forming property of hot rolling DP980 steel poor, increases part punching in the process to mold
Abrasion and springback capacity.Therefore, under the conditions of existing bar strip continuous casting and rolling flow path, exist for thin gauge especially thickness specification
1.5mm hot rolling DP980 steel below, it is difficult to realize chemical component, process window, structure property, strip shape quality stable matching.
So far, the work of such fashioned iron is constrained without the precedent using thin slab continuous casting and rolling production hot-rolled dual-phase steel DP980 both at home and abroad
Industry metaplasia produces and " with hot Dai Leng " process of auto industry.
Summary of the invention
The purpose of the present invention is to provide a kind of method based on CSP process production thin gauge hot rolling DP980 steel, Neng Gousheng
Produce high intensity, low yield strength ratio, the thin gauge hot rolling DP980 steel that can be used for substituting condition of equivalent thickness specification cold rolling DP980 steel.
To achieve the above object, the method provided by the present invention based on CSP process production thin gauge hot rolling DP980 steel,
Include the following steps:
1) molten iron component is adjusted by smelting the modes such as refining, is to guarantee that hot rolling DP980 steel product meets component requirements
It is quasi-；
2) sheet blank continuous casting is carried out, control slab thickness is 55~60mm, and drawing speed is 3.6~3.9m/min；
3) conventional soaking being carried out to slab, and controlling tapping temperature is 1210~1230 DEG C, soaking time is 25~
35min；
4) high-pressure water descaling is carried out, and controls de-scaling water inlet pressure not less than 180bar, outlet pressure is not less than
220bar, de-scaling water need to open in advance, it is ensured that strip steel head is completed to build pressure before entering de-scaling；
5) carry out seven passage finish rolling, control finishing temperature be 810~830 DEG C, control Final Stand Rolling speed be 6.0~
9.8m/s, and carry out constant speed rolling；
6) it is cooled down and is batched, described cooling using two-stage cooling mode, belt steel temperature is down to by first segment water cooling
670~690 DEG C, then air-cooled 4.2~5.8s, makes the ferrite content in hot rolling DP980 steel reach required volume fraction；The
Belt steel temperature is down to 100~200 DEG C by two sections of water coolings, and the martensite content in hot rolling DP980 steel is made to reach required volume point
Number；It is batched after two-stage cooling；
7) it carries out smooth, is carried out after steel roll temperature is down to 50 DEG C or less smooth, work roll for temper mill is made using 30 μm of convex rollers
With positive roller control model, and skin pass rolling power is controlled within 200t, while guaranteeing finished strip strip shape quality, reduce material
The elevation amplitude of yield strength and yield tensile ratio is expected, to obtain the hot rolling DP980 steel of low yield strength ratio.
By hot rolling DP980 steel made from above-mentioned steps, the elemental constituent for being included and weight percent content (i.e. step
1) component requirements described in) as follows: C:0.16~0.18%, Si:0.40~0.65%, Mn:1.20~1.35%, Cr:0.40
~0.60%, Als:0.02~0.07%, P :≤0.030%, S :≤0.008%, remaining is Fe and inevitable impurity.
Preferably, the component of the hot rolling DP980 steel and weight percent content are as follows: C:0.16~0.18%, Si:
0.40~0.60%, Mn:1.25~1.35%, Cr:0.45~0.60%, Als:0.02~0.06%, P :≤0.025%, S:
≤ 0.005%, remaining is Fe and inevitable impurity.
Preferably, in step 1), adjustment molten iron component include the following steps: 1.1) desulfurizing iron, and control S≤
0.001%, molten iron exposed surface >=96% after skimming；1.2) converter smelting is carried out, and carries out LF furnace refining；1.3) RH vacuum is carried out
Processing controls RH temperature leaving from station at 1575~1585 DEG C.
Preferably, in step 6), adjusting ferritic volume fraction in hot rolling DP980 steel is 45~50%, martensite
Volume fraction is 50~55%.
Preferably, in step 6), after the completion of cooling down in the first stage, second stage is cooling start before and it is cooling after the completion of
Start side spray, and starting blower is purged, to remove belt steel surface residual water, realizes that temperature accurately controls, and mention
The accuracy of high detection device temperature measurement.
Preferably, hot rolling DP980 steel produced, thickness specification are 1.0~2.0mm, and the yield strength of material is 550
~670MPa, tensile strength >=980MPa, elongation percentage A50 >=15%, yield tensile ratio≤0.60 can be used for substituting condition of equivalent thickness specification
Cold rolling DP980 steel.
The selection of each step main technologic parameters of the present invention or preferred reason are as follows:
1) de-scaling water is opened in step 4) in advance, and completes to build pressure and reach de-scaling water pressure before strip steel head enters de-scaling
It is to keep strip overall length temperature uniform in order to reduce strip steel head temperature, to guarantee operation of rolling constant airspeed, mention to target value
The controllability of two-phase proportion in high duplex structure, achievees the purpose that properties of product are stable.
2) control Final Stand Rolling speed is 6.0~9.8m/s in step 5), uses two stage type cooling technique in step 6),
First segment is cooling to be down to 670~690 DEG C for belt steel temperature, and then air-cooled 4.2~5.8s, is to make in hot rolling DP980 steel
Ferrite content reaches required volume fraction；Second segment is cooling to be down to 100~200 DEG C for belt steel temperature, is to make hot rolling
Martensite content in DP980 steel reaches required volume fraction, volume fraction needed for ferrite in the hot rolling DP980 steel
It is 45~50%, it is key technology of the invention that volume fraction needed for martensite, which is 50~55%,.
3) in step 6), after the completion of preferably cooling down in the first stage, second stage is cooling start before and it is cooling after the completion of
Starting side spray (positioned at the sprinkler of working side) is sprayed water, and is started blower (being located at side spray the same side) and blown
It sweeps, is to realize that temperature accurately controls, and improve the accuracy of detection device temperature measurement to remove belt steel surface residual water.
4) in step 7), work roll for temper mill uses 30 μm of convex rollers, using positive roller control model, and controls smooth two side pressure
Power is within 200 tons, while being to guarantee that finished strip strip shape quality is good, reduces material yield strength and yield tensile ratio
Elevation amplitude improves the forming property of material to obtain the hot rolling DP980 steel of low yield strength ratio, and it is right during part punching to reduce
The abrasion of mold and springback capacity are key technologies of the invention.
Compared with prior art, the invention has the following advantages that
1) thin gauge high-strength hot-rolled dual-phase steel DP980 is produced using CSP technique for the first time.C-Si- in present invention use
Mn-Cr component system, CSP producing line produce thin gauge hot rolling DP980 steel, hot rolling DP980 steel can effectively obtain ferrite+
Martensite duplex structure, thickness specification are 1.0~2.0mm, the yield strength of material up to 550~670MPa, tensile strength >=
980MPa, elongation percentage A50 >=15%, yield tensile ratio≤0.60 have the spy of low cost, high-intensitive, thin gauge and low yield strength ratio
Point.
2) hot rolling DP980 steel produced does not need subsequent cold for substituting the cold rolling DP980 steel of condition of equivalent thickness specification
It rolls and anneals, cost can be greatly reduced, shorten production procedure, and energy conservation and environmental protection；It can also avoid simultaneously existing thin
Slab continuous casting rolling technology produces the problem of higher thin gauge hot rolling DP980 steel yield tensile ratio, deformed steel strip.
3) manufacturing process of the present invention is short, and properties of product are stablized, and strip shape quality is good, and thickness and precision is high, can reach cold rolling production
The quality requirement of product can be used for substituting the cold rolling DP980 steel of condition of equivalent thickness specification, to automobile lightweight, push automobile work
" with hot Dai Leng " process of industry is of great significance.
Detailed description of the invention
Fig. 1 is the metallographic structure figure of the thin gauge hot rolling DP980 steel produced of the embodiment of the present invention 2.
Specific embodiment
Method provided by the present invention based on CSP process production thin gauge hot rolling DP980 steel, its step are as follows:
1) desulfurizing iron, and S≤0.001% is controlled, molten iron exposed surface >=96% after skimming；
2) converter smelting is carried out, and carries out LF furnace refining；Carry out RH application of vacuum, control RH temperature leaving from station 1575~
1585℃；
3) sheet blank continuous casting is carried out, control slab thickness is 55~60mm, and drawing speed is 3.6~3.9m/min；
4) conventional soaking being carried out to slab, and controlling tapping temperature is 1210~1230 DEG C, soaking time is 25~
35min；
5) high-pressure water descaling is carried out, and controls de-scaling water inlet pressure not less than 180bar, outlet pressure is not less than
220bar, de-scaling water need to open in advance, it is ensured that strip steel head is completed to build pressure before entering de-scaling；
6) carry out seven passage finish rolling, control finishing temperature be 810~830 DEG C, control Final Stand Rolling speed be 6.0~
9.8m/s, and carry out constant speed rolling；
F1~F4 rack roll gap cooling water timing is adjusted, F1 setting value is 12m, and F2 setting value is 17m, and F3 setting value is
21.5m, F4 setting value are 26m, it is ensured that the gap cooling water of the rack is opened before strip steel head reaches each rack.Breast roll
It stitches cooling water and opens timing on the basis of soaking outlet of still, for example, F1 rack roll gap cooling water timing settings are 12m, display plate
F1 rack roll gap cooling water is opened after going out 12 meters of soaking pit in base head；F2 rack roll gap cooling water timing settings are 17m, display plate
F2 rack roll gap cooling water is opened after going out 17 meters of soaking pit in base head；It is same with de-scaling water phase is opened in advance, F1~F4 is opened in advance
Rack roll gap cooling water keeps strip overall length temperature uniform, also for strip steel head temperature is reduced to guarantee operation of rolling speed
It is constant, the controllability of two-phase proportion in duplex structure is improved, achievees the purpose that properties of product are stable.
F7 rack AGC (gauge automatic control) amplitude limit value is set as 0.8mm, F6 rack AGC amplitude limit value is set as
1.0mm improves steel strip thickness precision while ensuring thin material rolling stability.The setting of AGC amplitude limit value is too small to will limit thickness
The ability of automatic control, the setting of AGC amplitude limit value is excessive, will lead to the Frequent Accidents such as the folding of the thin material operation of rolling, whipping, or even hair
Raw steel scrap breaks and pours accident, influences stable and antegrade production.
7) it is cooled down and is batched, using two-stage cooling mode, belt steel temperature is down to 670~690 by first segment water cooling
DEG C, then air-cooled 4.2~5.8s, makes the ferrite content in hot rolling DP980 steel reach required volume fraction；Second segment water cooling
Belt steel temperature is down to 100~200 DEG C, the martensite content in hot rolling DP980 steel is made to reach required volume fraction；Two-part
It is batched after cooling；Volume fraction needed for ferrite is 45~50% in hot rolling DP980 steel, volume fraction needed for martensite
It is 50~55%；
After the completion of cooling down in the first stage, second stage is cooling start before and it is cooling after the completion of start side spray and blower
It is purged, to remove belt steel surface residual water, realizes that temperature accurately controls, and improve the accurate of detection device temperature measurement
Property.
8) it carries out smooth, is carried out after steel roll temperature is down to 50 DEG C or less smooth, work roll for temper mill is made using 30 μm of convex rollers
With positive roller control model, and skin pass rolling power is controlled within 200t, while guaranteeing finished strip strip shape quality, reduce material
The elevation amplitude of yield strength and yield tensile ratio is expected, to obtain the hot rolling DP980 steel of low yield strength ratio；
9) process after carrying out.
By hot rolling DP980 steel made from above-mentioned steps, the elemental constituent and weight percent content for being included are as follows: C:
0.16~0.18%, Si:0.40~0.65%, Mn:1.20~1.35%, Cr:0.40~0.60%, Als:0.02~
0.07%, P :≤0.030%, S :≤0.008%, remaining is Fe and inevitable impurity.
Below by specific embodiment, the present invention is further illustrated.
Examples 1 to 6
By above-mentioned steps, in Examples 1 to 6, the chemical component and its weight percent of thin gauge hot rolling DP980 steel are shown in Table
1。
By above-mentioned steps, in Examples 1 to 6, the main technologic parameters that thin gauge hot rolling DP980 steel production process is related to are taken
Value is shown in Table 2.
By above-mentioned steps, in Examples 1 to 6, the structure property detection of thin gauge hot rolling DP980 steel and quality condition are shown in Table
3。
1 Examples 1 to 6 chemical component comparative example (wt%) of table
| Embodiment | C | Si | Mn | P | S | Cr | Als |
| 1 | 0.175 | 0.65 | 1.25 | 0.022 | 0.003 | 0.46 | 0.032 |
| 2 | 0.160 | 0.52 | 1.35 | 0.019 | 0.004 | 0.60 | 0.045 |
| 3 | 0.172 | 0.48 | 1.27 | 0.021 | 0.005 | 0.53 | 0.070 |
| 4 | 0.170 | 0.46 | 1.30 | 0.016 | 0.008 | 0.46 | 0.038 |
| 5 | 0.172 | 0.40 | 1.26 | 0.015 | 0.004 | 0.49 | 0.020 |
| 6 | 0.180 | 0.42 | 1.20 | 0.030 | 0.006 | 0.40 | 0.035 |
2 Examples 1 to 6 main technologic parameters comparative example of table
The detection of 3 Examples 1 to 6 structure property of table and quality in kind situation list
From table 1~3 as can be seen that the present invention is based on the thin gauge hot rolling DP980 steel that CSP process produces, thickness specification is
1.0~2.0mm, the yield strength of material is up to 550~670MPa, tensile strength >=980MPa, elongation percentage A50 >=15%, Qu Qiang
Than≤0.60, has the characteristics of low cost, high-intensitive, thin gauge and low yield strength ratio.It can be used for manufacturing vehicle in automobile steel
The structural members such as door collision prevention girders, seat beam.
Fig. 1 gives the metallographic structure figure of the thin gauge hot rolling DP980 steel produced of embodiment 2, as can be seen from the figure
DP980 finished product tissue is ferrite+Dispersed precipitate island-like martensite of polygon, and grain size number is 12.0~12.5 grades.
Claims (6)
1. a kind of method based on CSP process production thin gauge hot rolling DP980 steel, characterized by the following steps:
1) molten iron component is adjusted, is subject to and guarantees that hot rolling DP980 steel product meets component requirements；
2) sheet blank continuous casting is carried out, control slab thickness is 55~60mm, and drawing speed is 3.6~3.9m/min；
3) conventional soaking is carried out to slab, and controlling tapping temperature is 1210~1230 DEG C, soaking time is 25~35min；
4) high-pressure water descaling is carried out, and controls de-scaling water inlet pressure not less than 180bar, outlet pressure is not less than 220bar, removes
Squama water needs to open in advance, it is ensured that strip steel head is completed to build pressure before entering de-scaling；
5) seven passage finish rolling are carried out, control finishing temperature is 810~830 DEG C, and control Final Stand Rolling speed is 6.0~9.8m/
S, and carry out constant speed rolling；
6) cooled down and batched, it is described it is cooling use two-stage cooling mode, belt steel temperature is down to 670 by first segment water cooling~
690 DEG C, then air-cooled 4.2~5.8s, makes the ferrite content in hot rolling DP980 steel reach required volume fraction；Second segment
Belt steel temperature is down to 100~200 DEG C by water cooling, and the martensite content in hot rolling DP980 steel is made to reach required volume fraction；Two
It is batched after segmentation is cooling；
7) carried out after steel roll temperature is down to 50 DEG C or less it is smooth, work roll for temper mill use 30 μm of convex rollers, controlled using positive roller
Mode, and skin pass rolling power is controlled within 200t；
By hot rolling DP980 steel made from above-mentioned steps, the elemental constituent and weight percent content for being included are as follows: C:0.16
~0.18%, Si:0.40~0.65%, Mn:1.20~1.35%, Cr:0.40~0.60%, Als:0.02~0.07%, P:
≤ 0.030%, S :≤0.008%, remaining is Fe and inevitable impurity.
2. the method according to claim 1 based on CSP process production thin gauge hot rolling DP980 steel, it is characterised in that: institute
Component and the weight percent content for stating hot rolling DP980 steel are as follows: C:0.16~0.18%, Si:0.40~0.60%, Mn:
1.25~1.35%, Cr:0.45~0.60%, Als:0.02~0.06%, P :≤0.025%, S :≤0.005%, remaining is
Fe and inevitable impurity.
3. the method according to claim 1 based on CSP process production thin gauge hot rolling DP980 steel, it is characterised in that: step
It is rapid 1) in, adjustment molten iron component includes the following steps: 1.1) desulfurizing iron, and controls S≤0.001%, molten iron is exposed after skimming
Face >=96%；1.2) converter smelting is carried out, and carries out LF furnace refining；1.3) RH application of vacuum is carried out, control RH temperature leaving from station exists
1575~1585 DEG C.
4. the method described in any one of claim 1 to 3 based on CSP process production thin gauge hot rolling DP980 steel,
Be characterized in that: in step 6), adjusting ferritic volume fraction in hot rolling DP980 steel is 45~50%, the volume point of martensite
Number is 50~55%.
5. the method described in any one of claim 1 to 3 based on CSP process production thin gauge hot rolling DP980 steel,
Be characterized in that: in step 6), after the completion of cooling down in the first stage, second stage is cooling start before and it is cooling after the completion of start
Side spray is sprayed water, and starting blower is purged, to remove belt steel surface residual water.
6. the method described in any one of claim 1 to 3 based on CSP process production thin gauge hot rolling DP980 steel,
Be characterized in that: hot rolling DP980 steel produced, thickness specification are 1.0~2.0mm, the yield strength of material is 550~
670MPa, tensile strength >=980MPa, elongation percentage A50 >=15%, yield tensile ratio≤0.60.
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| CN109266960B (en) * | 2018-09-26 | 2019-11-26 | 武汉钢铁有限公司 | Using the tensile strength >=800MPa thin gauge weathering steel and method of short route production |
| CN109321827B (en) * | 2018-10-26 | 2021-04-20 | 山东钢铁集团日照有限公司 | Method for producing economical hot-rolled DP780 steel with different yield strength grades |
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| CN106734200B (en) * | 2016-12-27 | 2018-05-08 | 中冶南方工程技术有限公司 | A kind of method using continuous casting and rolling technique of sheet bar production Thin Specs dual phase steel |
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