CN107716551A - Method based on CSP flows production Thin Specs hot rolling DP980 steel - Google Patents
Method based on CSP flows production Thin Specs 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
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- 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
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- 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
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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Abstract
The invention discloses a kind of method based on CSP flows production Thin Specs hot rolling DP980 steel, comprise the following steps：1) molten iron component is adjusted；2) sheet blank continuous casting, it is 55~60mm to control slab thickness, and casting speed is 3.6~3.9m/min；3) conventional soaking, it is 1210~1230 DEG C to control tapping temperature, 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) two-stage cooling and batch, first paragraph water cooling is to 670~690 DEG C, then 4.2~5.8s of air cooling, and second segment water cooling is to 100~200 DEG C；7) carry out smooth.Manufacturing process of the present invention is short, properties of product are stable, strip shape quality is good, thickness and precision is high, the characteristics of with low cost, high intensity, Thin Specs and low yield strength ratio, the quality requirement of cold-rolled products can be reached, to automobile lightweight, promote " being significant with hot Dai Leng " processes for auto industry.
Description
Technical field
The present invention relates to a kind of hot rolling DP980 steel, particularly relates to a kind of based on CSP flows production Thin Specs hot rolling DP980
The method of steel.
Background technology
With the increasingly depleted of the energy and the deterioration of ecological environment, the lightweight of automobile increasingly attracts attention.Use height
Strength automotive is to realize that automobile loss of weight saves, improved the effective means of security with steel.In the ultralight steel car of IISI
In the works, high strength steel accounts for the 97% of material therefor to body-advanced concept car (ULSAB-AVC), wherein advanced high strength steel
Ratio account for more than 80%.But with the continuous improvement of intensity, the forming property of material can worse and worse, especially 980MPa with
On high strength steel, cracking be present in forming process, the problems such as resilience and accessory size do not reach required precision, liquidate simultaneously
Pressure equipment proposes higher requirement, and also has large effect to the mold use cycle.
Dual phase steel abbreviation DP steel, it is the advanced high-strength steel being made up of ferrite and martensite two-phase structure, is bent because its is low strong
Than, high initial manufacture hardening ratio, the matching of good strong plasticity and baking and hardening performance etc., can meet automobile various structures part plus
The application demand of strong part and anti-striker, turn into current application amount maximum, the vehicle structure steel of most species.DP steel presses producer
Formula is broadly divided into hot rolling DP steel and the class of cold rolling DP steel two, and compared with cold rolling DP steel, hot rolling DP steel has that cost is low, production procedure is simple
Just the advantages that and combination property is good.
At present, mainly based on DP600~DP780, DP780 is particularly the hot-rolled dual-phase steel for producing and applying both at home and abroad
The dual phase steel of more than DP980 ranks is still based on cold rolling.Therefore, develop DP980 and the Thin Specs of above rank are high-strength hot-rolled
Dual phase steel promotes automotive sheet " to have great importance with hot Dai Leng " for the application of expansion hot-rolled dual-phase steel.Such as
A kind of Publication No. CN 106119703A Chinese patent application " 980MPa levels hot-rolled dual-phase steel and its manufacture method " discloses
A kind of method in traditional hot rolling producing line production 980MPa level hot-rolled dual-phase steels, the steel chemical composition percentage by weight 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 relation simultaneously：0.05%≤Nb+Ti≤0.10%.Described 980MPa level hot-rolled dual-phase steels are bent
Intensity >=500MPa is taken, 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, it is impossible to full
Sufficient automobile industry is to " with the demand of hot Dai Leng " Thin Specs hot-rolled dual-phase steel.
Bar strip continuous casting and rolling flow path is organically combined the processes such as the continuous casting of traditional process, heating, rolling, flow letter
About efficiently, energy-conserving and environment-protective., can be with the stable hot rolling of production performance using the characteristics of its mill speed is constant, cooling capacity is stronger
Dual phase steel.It is but cold by laminar flow during Thin Specs (especially thickness specification is in below 1.5mm) hot rolling DP980 steel is produced
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 too high or even bainite and pearlite occurs, and product yield tensile ratio is higher.Further, since 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, cause yield strength
And yield tensile ratio further raises, cause the forming property of hot rolling DP980 steel poor, add during part punching to mould
Abrasion and springback capacity.Therefore, under the conditions of existing bar strip continuous casting and rolling flow path, exist for Thin Specs especially thickness specification
Below 1.5mm hot rolling DP980 steel, it is difficult to realize chemical composition, process window, structure property, the stable matching of strip shape quality.
So far, the domestic and international precedent without using CSP production hot-rolled dual-phase steel DP980, the work of such shaped steel is constrained
Industry metaplasia produce and auto industry " with hot Dai Leng " processes.
The content of the invention
It is an object of the invention to provide a kind of method based on CSP flows production Thin Specs hot rolling DP980 steel, Neng Gousheng
Produce high intensity, low yield strength ratio, available for the Thin Specs hot rolling DP980 steel 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 flows production Thin Specs hot rolling DP980 steel,
Comprise the following steps：
1) by smelt refining etc. mode adjust molten iron component, using ensure hot rolling DP980 product made from steel meet component requirements as
It is accurate；
2) sheet blank continuous casting is carried out, it is 55~60mm to control slab thickness, and casting speed is 3.6~3.9m/min；
3) conventional soaking being carried out to strand, and it is 1210~1230 DEG C to control tapping temperature, soaking time is 25~
35min；
4) high-pressure water descaling is carried out, and controls de-scaling water inlet pressure to be 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) cooled down and batched, the cooling uses two-stage cooling mode, and belt steel temperature is down to by first paragraph water cooling
670~690 DEG C, then 4.2~5.8s of air cooling, 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, the martensite content in hot rolling DP980 steel is reached required volume integral
Number；Batched after two-stage cooling；
7) carry out smooth, carried out after steel roll temperature is down to below 50 DEG C smooth, work roll for temper mill uses 30 μm of convex rollers, makes
With positive roller control model, and skin pass rolling power is controlled within 200t, while ensureing 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.
The hot rolling DP980 steel as made from above-mentioned steps, its elemental constituent included and weight percent content (i.e. step
1) component requirements described in) it is 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 comprises 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 stove refinings；1.3) RH vacuum is carried out
Processing, control RH temperature leaving from station is at 1575~1585 DEG C.
Preferably, in step 6), it is 45~50% to adjust ferritic volume fraction in hot rolling DP980 steel, martensite
Volume fraction is 50~55%.
Preferably, in step 6), in the first stage cool down after the completion of, second stage cooling start before and cooling after the completion of
Start side spray, and start blower fan and purged, to remove belt steel surface residual water, realize that temperature accurately controls, and carry
The accuracy of high detection device temperature measurement.
Preferably, the hot rolling DP980 steel produced, its 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, available for replacement 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 building pressure into completion before de-scaling in strip steel head reaches de-scaling water pressure
To desired value, it is to reduce strip steel head temperature, makes strip total length temperature uniform, to ensure operation of rolling constant airspeed, carry
The controllability of two-phase proportion in high duplex structure, reach the stable purpose of properties of product.
2) it is 6.0~9.8m/s to control Final Stand Rolling speed in step 5), and two stage type cooling technique is used in step 6),
Belt steel temperature is down to 670~690 DEG C by first paragraph cooling, and then 4.2~5.8s of air cooling, is in order that in hot rolling DP980 steel
Ferrite content reaches required volume fraction；Belt steel temperature is down to 100~200 DEG C by second segment cooling, is in order that hot rolling
Martensite content in DP980 steel reaches required volume fraction, the volume fraction in the hot rolling DP980 steel needed for ferrite
For 45~50%, the volume fraction needed for martensite is 50~55%, is the key technology of the present invention.
3) in step 6), preferably in the first stage cool down after the completion of, second stage cooling start before and cooling after the completion of
Start side spray (sprinkler for being located at active side) to be sprayed water, and start blower fan (being located at side spray the same side) and blown
Sweep, be to remove belt steel surface residual water, realize that temperature accurately controls, and improve the accuracy of detection device temperature survey.
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 ensure that finished strip strip shape quality is good, reduces material yield strength and yield tensile ratio
Elevation amplitude, to obtain the hot rolling DP980 steel of low yield strength ratio, improve the forming property of material, it is right during part punching to reduce
The abrasion of mould and springback capacity, it is the key technology of the present invention.
Compared with prior art, the present invention has advantages below：
1) Thin Specs high-strength hot-rolled dual-phase steel DP980 is gone out using CSP technique productions first.C-Si- during the present invention uses
Mn-Cr component systems, CSP producing lines produce Thin Specs 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, possesses the spy of low cost, high intensity, Thin Specs and low yield strength ratio
Point.
2) the hot rolling DP980 steel produced, for substituting the cold rolling DP980 steel of condition of equivalent thickness specification, it is not necessary to follow-up cold
Roll and anneal, cost can be greatly reduced, shorten production procedure, and energy-conserving and environment-protective；It can also avoid simultaneously existing thin
The problem of slab continuous casting rolling technology production Thin Specs hot rolling DP980 steel yield tensile ratios are higher, deformed steel strip.
3) manufacturing process of the present invention is short, and properties of product are stable, and strip shape quality is good, and thickness and precision is high, can reach cold rolling production
The quality requirement of product, available for the cold rolling DP980 steel for substituting condition of equivalent thickness specification, to automobile lightweight, promote automobile work
Industry " is significant with hot Dai Leng " processes.
Brief description of the drawings
The metallographic structure figure for the Thin Specs hot rolling DP980 steel that Fig. 1 is produced by the embodiment of the present invention 2.
Embodiment
Method provided by the present invention based on CSP flows production Thin Specs 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 stove refinings；Carry out RH application of vacuum, control RH temperature leaving from station 1575~
1585℃；
3) sheet blank continuous casting is carried out, it is 55~60mm to control slab thickness, and casting speed is 3.6~3.9m/min；
4) conventional soaking being carried out to strand, and it is 1210~1230 DEG C to control tapping temperature, soaking time is 25~
35min；
5) high-pressure water descaling is carried out, and controls de-scaling water inlet pressure to be 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 frame roll gap cooling water sequential is adjusted, F1 setting values are 12m, and F2 setting values are 17m, and F3 setting values are
21.5m, F4 setting value are 26m, it is ensured that the gap cooling water of the frame is opened before strip steel head reaches each frame.Breast roll
Stitch cooling water and open sequential on the basis of soaking outlet of still, for example, F1 frame roll gap cooling water timing settings are 12m, display plate
F1 frame roll gap cooling waters are opened after going out 12 meters of soaking pit in base head；F2 frame roll gap cooling water timing settings are 17m, display plate
F2 frame roll gap cooling waters are opened after going out 17 meters of soaking pit in base head；It is same with opening de-scaling aqueous phase in advance, F1~F4 is opened in advance
Frame roll gap cooling water, also for strip steel head temperature is reduced, make strip total length temperature uniform, to ensure operation of rolling speed
It is constant, the controllability of two-phase proportion in duplex structure is improved, reaches the stable purpose of properties of product.
F7 frames AGC (gauge automatic control) amplitude limit value is set as 0.8mm, F6 frame AGC amplitude limit values are set as
1.0mm, while thin material rolling stability is ensured, improve belt steel thickness precision.The setting of AGC amplitude limit values is too small can limited thickness
The ability automatically controlled, the setting of AGC amplitude limit values is excessive, can cause the Frequent Accidents such as the folding of the thin material operation of rolling, whipping, or even hair
Raw steel scrap, break and pour accident, influence production stable and antegrade.
7) cooled down and batched, using two-stage cooling mode, belt steel temperature is down to 670~690 by first paragraph water cooling
DEG C, then 4.2~5.8s of air cooling, 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 reached required volume fraction；Two-part
Batched after cooling；Volume fraction needed for ferrite is 45~50% in hot rolling DP980 steel, volume fraction needed for martensite
For 50~55%；
In the first stage cool down after the completion of, second stage cooling start before and cooling after the completion of start side spray and blower fan
Purged, to remove belt steel surface residual water, realize that temperature accurately controls, and improve the accurate of detection device temperature survey
Property.
8) carry out smooth, carried out after steel roll temperature is down to below 50 DEG C smooth, work roll for temper mill uses 30 μm of convex rollers, makes
With positive roller control model, and skin pass rolling power is controlled within 200t, while ensureing 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.
The hot rolling DP980 steel as made from above-mentioned steps, its elemental constituent included and weight percent content 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.
Embodiment 1~6
By above-mentioned steps, in embodiment 1~6, the chemical composition and its percetage by weight of Thin Specs hot rolling DP980 steel are shown in Table
1。
By above-mentioned steps, in embodiment 1~6, the main technologic parameters that Thin Specs hot rolling DP980 steel production processes are related to take
Value is shown in Table 2.
By above-mentioned steps, in embodiment 1~6, the structure property detection of Thin Specs hot rolling DP980 steel and quality condition are shown in Table
3。
The chemical composition comparative example (wt%) of 1 embodiment of table 1~6
| 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 |
The main technologic parameters comparative example of 2 embodiment of table 1~6
The structure property of 3 embodiment of table 1~6 detects and quality in kind situation list
From table 1~3 as can be seen that Thin Specs hot rolling DP980 steel of the present invention based on the production of CSP flows, thickness specification are
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, possesses the characteristics of low cost, high intensity, Thin Specs and low yield strength ratio.It can be used for manufacturing car in automobile steel
The structural members such as door collision prevention girders, seat beam.
Fig. 1 gives the metallographic structure figure for the Thin Specs hot rolling DP980 steel that embodiment 2 is produced, as can be seen from the figure
DP980 finished products are organized as the island-like martensite of ferrite+Dispersed precipitate of polygon, and grain size number is 12.0~12.5 grades.
Claims (6)
- A kind of 1. method based on CSP flows production Thin Specs hot rolling DP980 steel, it is characterised in that：Comprise the following steps：1) molten iron component is adjusted, to ensure that hot rolling DP980 product made from steel meets that component requirements are defined；2) sheet blank continuous casting is carried out, it is 55~60mm to control slab thickness, and casting speed is 3.6~3.9m/min；3) conventional soaking is carried out to strand, and it is 1210~1230 DEG C to control tapping temperature, soaking time is 25~35min；4) high-pressure water descaling is carried out, and controls de-scaling water inlet pressure to be not less than 180bar, outlet pressure is not less than 220bar, removed 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, it is 810~830 DEG C to control finishing temperature, and it is 6.0~9.8m/ to control Final Stand Rolling speed S, and carry out constant speed rolling；6) being cooled down and batched, the cooling uses two-stage cooling mode, and belt steel temperature is down to 670 by first paragraph water cooling~ 690 DEG C, then 4.2~5.8s of air cooling, 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, the martensite content in hot rolling DP980 steel is reached required volume fraction；Two Batched after segmentation cooling；7) carried out after steel roll temperature is down to below 50 DEG C smooth, work roll for temper mill uses 30 μm of convex rollers, is controlled using positive roller Pattern, and skin pass rolling power is controlled within 200t；The hot rolling DP980 steel as made from above-mentioned steps, its elemental constituent included and weight percent content 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 flows production Thin Specs 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 flows production Thin Specs hot rolling DP980 steel, it is characterised in that：Step It is rapid 1) in, adjustment molten iron component comprise the following steps：1.1) desulfurizing iron, and S≤0.001% is controlled, molten iron is exposed after skimming Face >=96%；1.2) converter smelting is carried out, and carries out LF stove refinings；1.3) RH application of vacuum is carried out, control RH temperature leaving from station exists 1575~1585 DEG C.
- 4. according to it is according to any one of claims 1 to 3 based on CSP flows produce Thin Specs hot rolling DP980 steel method, its It is characterised by：In step 6), it is 45~50% to adjust ferritic volume fraction in hot rolling DP980 steel, the volume integral of martensite Number is 50~55%.
- 5. according to it is according to any one of claims 1 to 3 based on CSP flows produce Thin Specs hot rolling DP980 steel method, its It is characterised by：In step 6), in the first stage cool down after the completion of, second stage cooling start before and cooling after the completion of start Side spray is sprayed water, and is started blower fan and purged, to remove belt steel surface residual water.
- 6. according to it is according to any one of claims 1 to 3 based on CSP flows produce Thin Specs hot rolling DP980 steel method, its It is characterised by：The hot rolling DP980 steel produced, its thickness specification are 1.0~2.0mm, the yield strength of material for 550~ 670MPa, tensile strength >=980MPa, elongation percentage A50 >=15%, yield tensile ratio≤0.60.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN114535294A (en) * | 2022-03-14 | 2022-05-27 | 武汉钢铁有限公司 | Method for producing hot-rolled strip steel with thickness of 1.0mm by CSP production line |
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| CN114535294A (en) * | 2022-03-14 | 2022-05-27 | 武汉钢铁有限公司 | Method for producing hot-rolled strip steel with thickness of 1.0mm by CSP production line |
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