CN107641761A - 500MPa levels have the Hot Rolling Automobile structural steel and iron and manufacture method of good welds performance - Google Patents
500MPa levels have the Hot Rolling Automobile structural steel and iron and manufacture method of good welds performance Download PDFInfo
- Publication number
- CN107641761A CN107641761A CN201710881208.2A CN201710881208A CN107641761A CN 107641761 A CN107641761 A CN 107641761A CN 201710881208 A CN201710881208 A CN 201710881208A CN 107641761 A CN107641761 A CN 107641761A
- Authority
- CN
- China
- Prior art keywords
- iron
- hot rolling
- continuous
- steel
- percentage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses the Hot Rolling Automobile structural steel and iron and manufacture method that a kind of 500MPa levels have good welds performance, carbon 0.03~0.06%, manganese 1.0~1.3%, niobium 0.035~0.045%, titanium 0.035~0.045%, silicon ＜ 0.10%, sulphur≤0.005%, phosphorus≤0.015%, nitrogen≤40ppm, dissolved aluminum 0.025~0.050%, surplus are iron and inevitable impurity.Nb Ti micro-alloying technologies are used in short route, using " low-carbon " composition design, reduce the carbon equivalent in steel, simultaneously, S, the N (S≤0.005%, N≤40ppm) fixed using trace Ti in steel, Nb, Ti fine grain effect and precipitation strength effect are given full play to, obtain the tiny precipitate of tiny F+P tissues and niobium titanium, while obtaining higher-strength, improve the welding performance of steel grade.
Description
Technical field
The invention belongs to steel hot rolled strip production technical field, and in particular to a kind of 500MPa levels have good welds
The Hot Rolling Automobile structural steel and iron and manufacture method of energy.
Background technology
In recent years, Domestic Automotive Industry is grown continuously and fast, and tremendous influence is brought to social energy resource supply and environmental protection.
With the increase of environmental protection pressure, the country promulgates a series of programmatic documents successively, and green should be accelerated by explicitly pointing out China's manufacturing industry
Manufacture, the transition paces of ecodevelopment.Now there are some researches show lightweight is to realize the most effective measure of automotive energy-saving emission-reducing, steel
The high strengthening of iron material is the important technology path of automobile lightweight.Greenization, high performance turn into automobile using steel
The development trend of material.
Traditional vehicle structure steel, the particularly following products of thickness 2.0mm use the manufacturing process of hot rolling+cold rolling, its
Manufacturing process length, complex procedures, high energy consumption, face the challenge from automobile industry green manufacturing and cost.Therefore how to develop
Go out greenization, low cost, the new automobile structural steel of Thin Specs become one brand-new problem of steel industry.
At present, the patent on Hot Rolling Automobile structural steel is more.Such as：Publication number CN1641059A Chinese patent provides
A kind of low-alloy high-strength steel and its manufacture method, which are added tri- kinds of alloys of Nb, V and Ti, its content is respectively 0.015~
0.025%Nb, 0.025~0.035%V, 0.010~0.020%Ti；And Mn contents are up to more than 1.3%, yield strength
Only require as more than 325MPa, elongation percentage more than 22%.Publication number CN1920081A Chinese patent application provides a kind of low
Alloy high strength steel, not only Mn contents are 1.25~1.75% for it, also added Mo alloys costly.Publication number
CN101768699A Chinese patent application provides a kind of low alloy high strength steel strip and its production method, wherein also with the addition of
Expensive Mo and Cr alloys.Publication number CN102534368A Chinese patent, it is wide thin that application provides a kind of low-alloy high-strength
Steel plate and its production method, wherein requiring that Mn contents are 1.4~1.6%, V content is 0.34~0.36%.Existing low-alloy
The steel grade of high-strength steel can add alloying component costly in actual production process, so as to cause its cost height, economic effect
Benefit is low.The Chinese patent " low-alloy high-strength steel galvanized sheet and its production method " of Application No. 201410036071.7, its steel grade
The quality proportioning of chemical composition is：C：0.04~0.07%；Si≤0.03%；Mn0.3~0.4%, P≤0.015%, S≤
0.012%, Als0.020~0.045%, N≤0.0050%, surplus Fe, by optimizing composition design, while corresponding adjustment
Hot rolling, cold rolling and zinc-plated process technological parameter, addition content only have 0.3~0.4% cheap Mn alloys, do not add it is any its
He produces 260~355MPa of yield strength low-alloy high-strength galvanized sheet in the case of alloying element, and elongation percentage reaches
More than 28%.The above patent production product, the technological process of production generally used for：Pneumatic steelmaking-hot rolling-pickling and cold-rolling-
Zinc-plated etc., production procedure is longer, and cost is high, and product does not have stronger competitiveness.And short route due to itself producing line the characteristics of,
1.0~3.0mm can be produced, yield strength >=500MPa Thin Specs Hot Rolling Automobile structural steel, reduces follow-up cold rolling, annealing
Process, cost is reduced, improve product competitiveness.Most of structural member is required to weld in white body, and the weldability of high-strength steel
It is universal poor, the application of material is influenceed, therefore, there is the hot rolling of good welds performance based on short route production 500MPa levels
Vehicle structure steel plate is one of this area technological difficulties urgently to be resolved hurrily.
The content of the invention
Present invention aim to provide a kind of 500MPa levels to have the Hot Rolling Automobile structural steel and iron of good welds performance
And manufacture method, can produce yield strength 500MPa level Thin Specs hot-rolled products, carbon equivalent w≤0.25% of steel, have it is good
Good welding performance, meanwhile, the fluctuation range of yield strength and tensile strength is controlled within 60MPa, disclosure satisfy that identical strong
The standard requirement of rank cold-rolled products is spent, there is good cold forming capability.
To achieve the above object, the technical solution adopted by the present invention is：500MPa levels have the hot rolling of good welds performance
Vehicle structure steel plate, the chemical element component and its percentage by weight contained are：Carbon 0.03~0.06%, manganese 1.0~1.3%,
Niobium 0.035~0.045%, titanium 0.035~0.045%, silicon ＜ 0.10%, sulphur≤0.005%, phosphorus≤0.015%, nitrogen≤
40ppm, dissolved aluminum 0.025~0.050%, surplus are iron and inevitable impurity.
" with hot Dai Leng ", meet the requirement of auto parts and components, to the field trash and surface quality in steel for realize steel grade
There are strict requirements, the composition design thinking with reference to short route using the Nb-Ti microalloys of " low silicon, low manganese ", redesign into
Split system.
The percentage by weight of the carbon is 0.05~0.055%.
Si (silicon)：There is very strong solution strengthening effect, but be first oxidized to SiO under the high temperature conditions2, then SiO2With
FeO in oxide layer reacts to form fayalite phase (Fe2SiO4), easily it is enriched at the faying face of iron scale and matrix, once
Continuous Fe is formed between iron scale and matrix2SiO4Layer, plays " pinning " to iron scale, is made in the operation of rolling
Into scale defect, deteriorate the surface quality of hot rolled steel plate, increase the roughness of iron scale and basal body interface, so, it is right
Si is strictly limited, and its content is limited to<Within the scope of 0.10%.
Mn (manganese)：Solution strengthening element, oxide under the high temperature conditions is similar to Fe oxide, there is MnO, Mn3O4、
Mn2O3Etc. several oxides, and oxide corresponding with Fe has very high mutual solubility.When Mn contents are higher, easily generation
(FeMn)2SiO4, easily it is enriched with the faying face of iron scale and matrix, causes coarse, the shape of iron scale and basal body interface
The defects of into iron scale class, so its content is limited into 1.0~1.3%, preferably 1.05~1.15%.
Ti (titanium)：Crystal grain thinning, a small amount of Ti is added, for fixing free N, S in molten steel, improve the weldability of steel grade
Can, so its content is limited into 0.035~0.045%, preferably 0.035~0.042%.
Nb (niobium)：Crystal grain thinning, refined crystalline strengthening effect is played, but the problem of Nb raising austenite recrystallizations, easily drawn
The mixed grain structure in steel is played, so its content is limited into 0.035~0.045%, preferably 0.035~0.042%.
A kind of 500MPa levels as described above have the manufacture method of the Hot Rolling Automobile structural steel and iron of good welds performance, bag
Include following steps：
1) smelt
Molten steel is formed by the composition and percentage by weight are well mixed, using deep desulfurization pretreatment-converter refining during smelting
Steel-LF-RH (or without RH) technique；
Desulfurizing iron pre-processing requirements S≤0.005%, converter molten steel smelting requirements C >=0.03%, tapping temperature is 1660
~1690 DEG C；Deoxidation, slag making in LF stoves, temperature >=1620 DEG C leaving from station；Molten steel enters in RH stoves, carries out decarburization, deoxidation, addition
Nb-Ti alloys, after alloy has added, circulation >=8min carries out brokenly sky, Argon >=5min again；
2) Calcium treatment
Carry out Calcium treatment and change slag, N controls≤40ppm, Als control is 0.025~0.050%, tapping temperature 1570
~1590 DEG C；
3) continuous casting
Continuous casting casting speed is 4~6m/min, slab thickness is that 50~150mm forms continuous-casting sheet billet；Strand is cold two
Water section uses edge weak cold system, and control cooling water inflow ensures that continuous-casting sheet billet enters Soaking Pit Temperature at 900~1000 DEG C, reduced
Strand edge cracks；
4) continuous-casting sheet billet soaking
After continuous-casting sheet billet enters soaking pit, time inside furnace is 20~40min, and tapping temperature is 1180~1230 DEG C；
5) de-scaling
Continuous-casting sheet billet carries out high-pressure water descaling before going out soaking pit feed mill, descaling header >=2 group, control de-scaling hydraulic pressure
Power is 280~320bar；
6) roll
It is 1120~1170 DEG C that continuous-casting sheet billet, which enters rolling mill temperature, the percentage pass reduction of finishing rolling control first, the second passage pressure
Lower rate and the 3rd percentage pass reduction are >=50%；Recrystallization fully occurs for austenite in the operation of rolling deformation condition is provided, disappear
Except the mixed crystal in tissue, it is 820~880 DEG C to control finishing temperature；
7) cool down
Coil of strip uses leading portion rapid cooling technique after rolling, and laminar flow medium temperature is 680~720 DEG C, and oiler temperature control is 560
~620 DEG C；
8) it is smooth
Coil of strip progress is smooth, and smooth power is 210~240 tons, eliminates yield point elongation.
Compared with prior art, the present invention has advantages below：
1) present invention is to use Nb-Ti micro-alloying technologies in short route, using " low-carbon " composition design, reduces steel grade
Carbon equivalent, meanwhile, S, the N (S≤0.005%, N≤40ppm) fixed using trace Ti in steel, give full play to Nb, Ti fine grain
Effect and precipitation strength effect, the tiny precipitate of tiny F+P tissues and niobium titanium is obtained, while obtaining higher-strength, is changed
The welding performance of kind steel grade；
2) brand-new component system is used in short route producing line, produces yield strength 500MPa level Thin Specs Hot Rolling Automobiles
Structural steel and iron, is organized as fine ferrite and pearlite, and grain size is 12~13 grades, does not occur mixed grain structure, and thickness is 1.0~
3.0mm, the yield strength of steel is in 500~620MPa, 530~690MPa of tensile strength, elongation percentage A80 >=14%, and carbon equivalent w≤
0.25%, there is excellent welding performance, while it is qualified to enter 180 DEG C of cold bending experiments of line width clod wash, Bend diameter d=0.5a (examinations
Sample thickness)；
3) present invention is based on short route producing line, and flow is brief efficiently, energy-conserving and environment-protective, is suitable for the thin of 1.0~3.0mm of production
Size hot-rolled vehicle structure steel plate, can substitute traditional cold-rolled products, save cold rolling, the annealing operation of complexity, significantly contract
Short manufacturing process, reduce manufacturing cost, reduce energy consumption water consume and all kinds of waste discharges, meeting automobile industry green manufacturing and low
The demand of cost；
4) present invention gives full play to the characteristics of short route operation of rolling temperature is uniform, can produce yield strength 500MPa levels
Thin Specs hot-rolled product, stable performance, fluctuation is small, and the fluctuation range of yield strength and tensile strength is controlled within 60MPa, energy
Enough meet the standard requirement of same intensity rank cold-rolled products, cold-rolled products can be substituted.
Brief description of the drawings
Fig. 1 is the steel precipitate signal for the Hot Rolling Automobile structural steel and iron that 500MPa levels of the present invention have good welds performance
Figure.
Embodiment
With reference to embodiment, the present invention is described in further detail, is easy to more clearly understand the present invention, but it
Not to the present invention form limit.
Embodiment 1
The present embodiment 500MPa levels have the Hot Rolling Automobile structural steel and iron of good welds performance, using " low-carbon, low silicon, low
The Nb-Ti microalloy component systems of manganese " are produced, and each element chemical composition mass percent wt% controls are as follows：C：
0.05%, Si：≤ 0.07%, Mn：1.05%, S：≤ 0.005%, P：≤ 0.015%, Nb：0.036%, Ti：0.035%, N：
≤ 40ppm, Als：0.025~0.050%；
Its manufacture method comprises the following steps：
1) smelt
Molten steel is formed by the composition and percentage by weight are well mixed, using deep desulfurization pretreatment-converter refining during smelting
Steel-LF-RH techniques；
Desulfurizing iron pre-processing requirements S：≤ 0.005%, converter molten steel smelting requirements C are 0.05%, and tapping temperature exists
1690℃；Deoxidation, slag making in LF stoves, temperature >=1653 DEG C leaving from station；Molten steel enters in RH stoves, carries out decarburization, deoxidation, addition
Nb-Ti alloys, after alloy has added, circulation >=8min carries out brokenly sky, Argon >=5min again；
2) Calcium treatment
Carry out Calcium treatment and change slag, N controls≤40ppm, Als control is 0.025~0.050%, tapping temperature 1578
℃；
3) continuous casting
Continuous casting casting speed is 4.3m/min, slab thickness is that 50mm forms continuous-casting sheet billet；Strand is adopted in secondary cooling water section
With edge weak cold system, control cooling water inflow ensures that continuous-casting sheet billet enters Soaking Pit Temperature at 920 DEG C, reduces strand edge and splits
Line；
4) continuous-casting sheet billet soaking
After continuous-casting sheet billet enters soaking pit, time inside furnace 25min, tapping temperature is 1180 DEG C；
5) de-scaling
Continuous-casting sheet billet carries out high-pressure water descaling before going out soaking pit feed mill, descaling header >=2 group, control de-scaling hydraulic pressure
Power is 300bar；
6) roll
Continuous-casting sheet billet enters rolling mill temperature for 1140 DEG C, the percentage pass reduction of finishing rolling control first, the second percentage pass reduction and
3rd percentage pass reduction is respectively 51%, 53%, 52%；Recrystallization fully occurs for austenite in the operation of rolling modified strip is provided
Part, the mixed crystal in tissue is eliminated, it is 820~880 DEG C to control finishing temperature；
7) cool down
Coil of strip uses leading portion rapid cooling technique after rolling, and laminar flow medium temperature is 680~720 DEG C, and oiler temperature control is 560
~620 DEG C；
8) it is smooth
Coil of strip progress is smooth, and smooth power is 210~240 tons, eliminates yield point elongation.
According to the component system of the present embodiment, the tissue, mechanics and work hardening rate for producing product are as shown in table 1.
Table 1 is tissue, mechanical property and the work hardening rate of the steel plate of embodiment 1
As table 1 and Fig. 1 can be seen that the yield strength 500MPa level Thin Specs Hot Rolling Automobile structures of the present embodiment production
Steel, performance meet the cold-rolled products standard requirement of same intensity rank, while carbon equivalent w≤0.25% of steel grade, processing hardening
Rate n >=0.15,180 ° of clod wash is qualified during curved footpath d=0.5a, has excellent welding performance and cold formability energy.
Embodiment 2
The present embodiment 500MPa levels have the Hot Rolling Automobile structural steel and iron of good welds performance, using " low-carbon, low silicon, low
The Nb-Ti microalloy component systems of manganese " are produced, and each element chemical composition mass percent wt% controls are as follows：C：
0.055%, Si：≤ 0.08%, Mn：1.10%, S：≤ 0.004%, P：≤ 0.015%, Nb：0.036%, Ti：0.037%,
N：≤ 40ppm, Als：0.025~0.050%；
Its manufacture method comprises the following steps：
1) smelt
Molten steel is formed by the composition and percentage by weight are well mixed, using deep desulfurization pretreatment-converter refining during smelting
Steel-LF-RH techniques；
Desulfurizing iron pre-processing requirements S：≤ 0.004%, converter molten steel smelting requirements C are 0.055%, and tapping temperature exists
1674℃；Deoxidation, slag making in LF stoves, temperature >=1635 DEG C leaving from station；Molten steel enters in RH stoves, carries out decarburization, deoxidation, addition
Nb-Ti alloys, after alloy has added, circulation >=8min carries out brokenly sky, Argon >=5min again；
2) Calcium treatment
Carry out Calcium treatment and change slag, N controls≤40ppm, Als control is 0.025~0.050%, tapping temperature 1576
℃；
3) continuous casting
Continuous casting casting speed is 4.5m/min, slab thickness is that 55mm forms continuous-casting sheet billet；Strand is adopted in secondary cooling water section
With edge weak cold system, control cooling water inflow ensures that continuous-casting sheet billet enters Soaking Pit Temperature at 950 DEG C, reduces strand edge and splits
Line；
4) continuous-casting sheet billet soaking
After continuous-casting sheet billet enters soaking pit, time inside furnace 30min, tapping temperature is 1200 DEG C；
5) de-scaling
Continuous-casting sheet billet carries out high-pressure water descaling before going out soaking pit feed mill, descaling header >=2 group, control de-scaling hydraulic pressure
Power is 320bar；
6) roll
Continuous-casting sheet billet enters rolling mill temperature for 1160 DEG C, the percentage pass reduction of finishing rolling control first, the second percentage pass reduction and
3rd percentage pass reduction is respectively 52%, 53%, 51%；Recrystallization fully occurs for austenite in the operation of rolling modified strip is provided
Part, the mixed crystal in tissue is eliminated, it is 820~880 DEG C to control finishing temperature；
7) cool down
Coil of strip uses leading portion rapid cooling technique after rolling, and laminar flow medium temperature is 680~720 DEG C, and oiler temperature control is 560
~620 DEG C；
8) it is smooth
Coil of strip progress is smooth, and smooth power is 210~240 tons, eliminates yield point elongation.
According to the component system of the present embodiment, the tissue, mechanics and work hardening rate for producing product are as shown in table 2.
Table 2 is tissue, mechanical property and the work hardening rate of the steel plate of embodiment 2
As table 2 and Fig. 1 can be seen that the yield strength 500MPa level Thin Specs Hot Rolling Automobile structures of the inventive method production
Steel, performance meet the cold-rolled products standard requirement of same intensity rank, while carbon equivalent w≤0.25% of steel grade, processing hardening
Rate n >=0.15,180 ° of clod wash is qualified during curved footpath d=0.5a, has excellent welding performance and cold formability energy.
Embodiment 3
The present embodiment 500MPa levels have the Hot Rolling Automobile structural steel and iron of good welds performance, using " low-carbon, low silicon, low
The Nb-Ti microalloy component systems of manganese " are produced, and each element chemical composition mass percent wt% controls are as follows：C：
0.055%, Si：≤ 0.07%, Mn：1.15%, S：≤ 0.003%, P：≤ 0.015%, Nb：0.036%, Ti：0.038%,
N：≤ 40ppm, Als：0.025~0.050%；
Its manufacture method comprises the following steps：
1) smelt
Molten steel is formed by the composition and percentage by weight are well mixed, using deep desulfurization pretreatment-converter refining during smelting
Steel-LF-RH techniques；
Desulfurizing iron pre-processing requirements S≤0.003%, converter molten steel smelting requirements C are 0.055%, and tapping temperature exists
1680℃；Deoxidation, slag making in LF stoves, temperature >=1645 DEG C leaving from station；Molten steel enters in RH stoves, carries out decarburization, deoxidation, addition
Nb-Ti alloys, after alloy has added, circulation >=8min carries out brokenly sky, Argon >=5min again；
2) Calcium treatment
Carry out Calcium treatment and change slag, N controls≤40ppm, Als control is 0.025~0.050%, tapping temperature 1577
℃；
3) continuous casting
Continuous casting casting speed is 5.0m/min, slab thickness is that 60mm forms continuous-casting sheet billet；Strand is adopted in secondary cooling water section
With edge weak cold system, control cooling water inflow ensures that continuous-casting sheet billet enters Soaking Pit Temperature at 990 DEG C, reduces strand edge and splits
Line；
4) continuous-casting sheet billet soaking
After continuous-casting sheet billet enters soaking pit, time inside furnace 30min, tapping temperature is 1230 DEG C；
5) de-scaling
Continuous-casting sheet billet carries out high-pressure water descaling before going out soaking pit feed mill, descaling header >=2 group, control de-scaling hydraulic pressure
Power is 320bar；
6) roll
Continuous-casting sheet billet enters rolling mill temperature for 1170 DEG C, the percentage pass reduction of finishing rolling control first, the second percentage pass reduction and
3rd percentage pass reduction is respectively 53%, 53%, 52%；Recrystallization fully occurs for austenite in the operation of rolling modified strip is provided
Part, the mixed crystal in tissue is eliminated, it is 820~880 DEG C to control finishing temperature；
7) cool down
Coil of strip uses leading portion rapid cooling technique after rolling, and laminar flow medium temperature is 680~720 DEG C, and oiler temperature control is 560
~620 DEG C；
8) it is smooth
Coil of strip progress is smooth, and smooth power is 210~240 tons, eliminates yield point elongation.
According to the component system of the present embodiment, the tissue, mechanics and work hardening rate for producing product are as shown in table 2.
Table 3 is tissue, mechanical property and the work hardening rate of the steel plate of embodiment 3
As table 3 and Fig. 1 can be seen that yield strength 500MPa 1.0~3.0mm of level Thin Specs heat of the inventive method production
Automobile structural steel is rolled, performance meets that the cold-rolled products standard of same intensity rank requires, while the carbon equivalent w of steel grade≤
0.25%, work hardening rate n >=0.15,180 ° of clod wash is qualified during curved footpath d=0.5a, has excellent welding performance and cold forming
Performance.
Claims (7)
1. a kind of 500MPa levels have the Hot Rolling Automobile structural steel and iron of good welds performance, it is characterised in that：Carbon 0.03~
0.06%th, manganese 1.0~1.3%, niobium 0.035~0.045%, titanium 0.035~0.045%, silicon ＜ 0.10%, sulphur≤0.005%,
Phosphorus≤0.015%, nitrogen≤40ppm, dissolved aluminum 0.025~0.050%, surplus are iron and inevitable impurity.
2. 500MPa levels have the Hot Rolling Automobile structural steel and iron of good welds performance according to claim 1, it is characterised in that：
The percentage by weight of the carbon is 0.05~0.055%.
3. 500MPa levels have the Hot Rolling Automobile structural steel and iron of good welds performance according to claim 1, it is characterised in that：
The percentage by weight of the manganese is 1.05~1.15%.
4. 500MPa levels have the Hot Rolling Automobile structural steel and iron of good welds performance according to claim 1, it is characterised in that：
The percentage by weight of the niobium is 0.035~0.042%.
5. 500MPa levels have the Hot Rolling Automobile structural steel and iron of good welds performance according to claim 1, it is characterised in that：
The percentage by weight of the titanium is 0.035~0.042%.
6. a kind of 500MPa levels as claimed in claim 1 have the manufacturer of the Hot Rolling Automobile structural steel and iron of good welds performance
Method, it is characterised in that：Comprise the following steps：
1) smelt
Form molten steel by the composition and percentage by weight are well mixed, during smelting using deep desulfurization pretreatment-pneumatic steelmaking-
LF-RH techniques；
2) Calcium treatment
Carry out Calcium treatment and change slag, N controls≤40ppm, Als control 0.025~0.050%, tapping temperature is 1570~
1590℃；
3) continuous casting
Continuous casting casting speed is 4~6m/min, slab thickness is that 50~150mm forms continuous-casting sheet billet；Strand is in secondary cooling water section
Using edge weak cold system, control cooling water inflow ensures that continuous-casting sheet billet enters Soaking Pit Temperature at 900~1000 DEG C；
4) continuous-casting sheet billet soaking
After continuous-casting sheet billet enters soaking pit, time inside furnace is 20~40min, and tapping temperature is 1180~1230 DEG C；
5) de-scaling
Continuous-casting sheet billet carries out high-pressure water descaling before going out soaking pit feed mill, and it is 280~320bar to control de-scaling water pressure；
6) roll
It is 1120~1170 DEG C that continuous-casting sheet billet, which enters rolling mill temperature, the percentage pass reduction of finishing rolling control first, the second percentage pass reduction
And the 3rd percentage pass reduction >=50%, and control finishing temperature as 820~880 DEG C；
7) cool down
Coil of strip uses leading portion rapid cooling technique after rolling, and laminar flow medium temperature is 680~720 DEG C, oiler temperature control 560~
620℃；
8) it is smooth
Coil of strip progress is smooth, and smooth power is 210~240 tons.
7. 500MPa levels have the manufacture method of the Hot Rolling Automobile structural steel and iron of good welds performance according to claim 6,
It is characterized in that：In the step 1), molten steel is formed by the composition and percentage by weight are well mixed, using deep de- during smelting
Sulphur pretreatment-pneumatic steelmaking-LF techniques.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710881208.2A CN107641761B (en) | 2017-09-26 | 2017-09-26 | 500 MPa-grade hot-rolled automobile structure steel plate with good welding performance and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710881208.2A CN107641761B (en) | 2017-09-26 | 2017-09-26 | 500 MPa-grade hot-rolled automobile structure steel plate with good welding performance and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107641761A true CN107641761A (en) | 2018-01-30 |
| CN107641761B CN107641761B (en) | 2020-02-07 |
Family
ID=61113762
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710881208.2A Active CN107641761B (en) | 2017-09-26 | 2017-09-26 | 500 MPa-grade hot-rolled automobile structure steel plate with good welding performance and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107641761B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109023110A (en) * | 2018-09-26 | 2018-12-18 | 武汉钢铁有限公司 | Using the 500MPa grade thin gauge Hot Rolling Automobile structural steel and method of short route production |
| CN109097699A (en) * | 2018-09-26 | 2018-12-28 | 武汉钢铁有限公司 | A kind of 900MPa grades of hot rolling automotive frame steel and its manufacturing method |
| CN110205552A (en) * | 2019-06-25 | 2019-09-06 | 武汉钢铁有限公司 | The hot rolling hot forming sheet metal and its production method of 1500MPa grades of short route productions of tensile strength and application |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101914725A (en) * | 2010-09-02 | 2010-12-15 | 唐山国丰钢铁有限公司 | Low-carbon ultra-deep punching cold-rolling steel sheet and production method thereof |
| CN103114257A (en) * | 2013-02-25 | 2013-05-22 | 武汉钢铁(集团)公司 | Acid-washing-free high-strength crossbeam steel with stable oxide layer and preparation method of steel |
| CN105950984A (en) * | 2016-05-06 | 2016-09-21 | 武汉钢铁股份有限公司 | Hot rolled duplex-phase steel with tensile strength being 650 MPa grade and production method thereof |
| CN106011646A (en) * | 2016-07-15 | 2016-10-12 | 武汉钢铁股份有限公司 | High-surface-quality automotive hot rolling acid pickling steel with tensile strength of 590 MPa and production method |
| CN106086665A (en) * | 2016-08-12 | 2016-11-09 | 武汉钢铁股份有限公司 | A kind of yield strength 530MPa level Hot Rolling Automobile steel plate and production method |
| CN106756508A (en) * | 2016-12-30 | 2017-05-31 | 日照宝华新材料有限公司 | The method that Thin Specs REH380LA steel is produced based on ESP bar strip continuous casting and rolling flow paths |
-
2017
- 2017-09-26 CN CN201710881208.2A patent/CN107641761B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101914725A (en) * | 2010-09-02 | 2010-12-15 | 唐山国丰钢铁有限公司 | Low-carbon ultra-deep punching cold-rolling steel sheet and production method thereof |
| CN103114257A (en) * | 2013-02-25 | 2013-05-22 | 武汉钢铁(集团)公司 | Acid-washing-free high-strength crossbeam steel with stable oxide layer and preparation method of steel |
| CN105950984A (en) * | 2016-05-06 | 2016-09-21 | 武汉钢铁股份有限公司 | Hot rolled duplex-phase steel with tensile strength being 650 MPa grade and production method thereof |
| CN106011646A (en) * | 2016-07-15 | 2016-10-12 | 武汉钢铁股份有限公司 | High-surface-quality automotive hot rolling acid pickling steel with tensile strength of 590 MPa and production method |
| CN106086665A (en) * | 2016-08-12 | 2016-11-09 | 武汉钢铁股份有限公司 | A kind of yield strength 530MPa level Hot Rolling Automobile steel plate and production method |
| CN106756508A (en) * | 2016-12-30 | 2017-05-31 | 日照宝华新材料有限公司 | The method that Thin Specs REH380LA steel is produced based on ESP bar strip continuous casting and rolling flow paths |
Non-Patent Citations (4)
| Title |
|---|
| 朱苗勇: "《现代冶金工艺学 钢铁冶金卷》", 31 December 2016, 冶金工业出版社 * |
| 毛新平: "《钛微合金钢》", 30 June 2016, 冶金工业出版社 * |
| 田定宇: "《薄板坯连铸连轧专集》", 31 December 1992, 上海第三钢铁厂 * |
| 臧绍双: "9Ni钢纯净化生产实践", 《鞍钢技术》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109023110A (en) * | 2018-09-26 | 2018-12-18 | 武汉钢铁有限公司 | Using the 500MPa grade thin gauge Hot Rolling Automobile structural steel and method of short route production |
| CN109097699A (en) * | 2018-09-26 | 2018-12-28 | 武汉钢铁有限公司 | A kind of 900MPa grades of hot rolling automotive frame steel and its manufacturing method |
| CN109097699B (en) * | 2018-09-26 | 2020-01-14 | 武汉钢铁有限公司 | 900 MPa-grade hot-rolled automobile girder steel and manufacturing method thereof |
| CN109023110B (en) * | 2018-09-26 | 2020-06-19 | 武汉钢铁有限公司 | 500 MPa-level thin-specification hot-rolled automobile structural steel produced by adopting short process and method |
| CN110205552A (en) * | 2019-06-25 | 2019-09-06 | 武汉钢铁有限公司 | The hot rolling hot forming sheet metal and its production method of 1500MPa grades of short route productions of tensile strength and application |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107641761B (en) | 2020-02-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102899556B (en) | Production method for low-alloy medium-thick steel plate | |
| CN109536846B (en) | High-toughness hot-rolled steel plate with yield strength of 700MPa and manufacturing method thereof | |
| CN103572025B (en) | Production method of low-cost X52 pipeline steel and pipeline steel | |
| CN104694822A (en) | High-strength hot rolled steel plate with 700 MPa grade yield strength and manufacturing method thereof | |
| CN107236905B (en) | 600MPa grade high-strength low yield strength ratio structural steel and irons and its manufacturing method | |
| CN112011737B (en) | 390 MPa-grade-20-DEG C-resistant hot-rolled angle steel for bridge structure and production method thereof | |
| CN111471937B (en) | Low-cost chromium-containing Q460MC steel plate and production method thereof | |
| CN107964624A (en) | A kind of yield strength 500MPa level structure steel and preparation method thereof | |
| CN107151763A (en) | The high-strength cold-formed use hot rolled strip of Thin Specs and its production method | |
| CN106399835A (en) | Production method of high-strength automobile hub steel | |
| CN103695807B (en) | Strong X100 Pipeline Steel Plate of superelevation that crack arrest is excellent and preparation method thereof | |
| CN102925794A (en) | Cold-rolled steel strip for double-layer welded tube | |
| CN102912224B (en) | Production method for low-alloy medium-thickness steel plate | |
| CN101812639A (en) | Steel used for welding hull with high strength and high input energy and production method thereof | |
| CN106609335A (en) | Tensile strength 700 MPa-grade high broaching hot-rolled steel plate and manufacturing method thereof | |
| CN109722601A (en) | A kind of production method of the super-thick steel plate Q420E of low-carbon-equivalent | |
| CN104131238B (en) | High molding high durable Ultra-thin hot rolled steel plate and CSP production technology thereof | |
| CN109055651A (en) | A method of 600MPa grades of carriage body steel of hot rolling thin gauge are produced completely without head bar strip continuous casting and rolling flow path based on ESP | |
| CN107385319A (en) | Yield strength 400MPa level Precision Welded Pipe steel plates and its manufacture method | |
| CN107893187A (en) | Based on the method that low-alloy high-strength steel is produced completely without head bar strip continuous casting and rolling flow path | |
| CN111945064A (en) | 355 MPa-level low-temperature-resistant hot-rolled H-shaped steel for ocean engineering and preparation method thereof | |
| CN113073251A (en) | Manufacturing method of 590 MPa-grade hot-rolled complex phase steel for thick-specification high-fatigue-performance automobile spoke | |
| CN102029305A (en) | Production method of super-thick steel plate | |
| CN109518074A (en) | A kind of economical high tenacity 800MPa grades of beam steels and its production method | |
| CN108315662B (en) | Hot rolled steel plate with yield strength of 900MPa and production process thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |